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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
Showing 1 - 200 of 265 Journals sorted alphabetically
Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 19)
Acta Nova     Open Access   (Followers: 2)
Acta Scientifica Malaysia     Open Access   (Followers: 1)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
Adıyaman University Journal of Science     Open Access  
Advanced Science     Open Access   (Followers: 16)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 8)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advances in Research     Open Access  
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African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 12)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 22)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 13)
Anales del Instituto de la Patagonia     Open Access  
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 2)
Arab Journal of Basic and Applied Sciences     Open Access  
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Asian Journal of Scientific Research     Open Access   (Followers: 2)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Australian Field Ornithology     Full-text available via subscription   (Followers: 1)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 6)
Bangladesh Journal of Scientific Research     Open Access  
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 11)
Bilge International Journal of Science and Technology Research     Open Access  
Bioethics Research Notes     Full-text available via subscription   (Followers: 15)
BJHS Themes     Open Access   (Followers: 1)
Bulletin de la Société Royale des Sciences de Liège     Open Access  
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Ciencia en su PC     Open Access   (Followers: 1)
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Ciência ET Praxis     Open Access  
Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Comunicata Scientiae     Open Access  
Conference Papers in Science     Open Access  
Configurations     Full-text available via subscription   (Followers: 11)
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Crea Ciencia Revista Científica     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 14)
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Data     Open Access   (Followers: 4)
Dhaka University Journal of Science     Open Access  
Discover Sustainability     Open Access   (Followers: 5)
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Emergent Scientist     Open Access  
Enhancing Learning in the Social Sciences     Open Access   (Followers: 7)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
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Entre Ciencia e Ingeniería     Open Access  
Epiphany     Open Access   (Followers: 1)
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
European Scientific Journal     Open Access   (Followers: 7)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Experimental Results     Open Access   (Followers: 2)
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Fontanus     Open Access   (Followers: 1)
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 252)
Frontiers in Climate     Open Access   (Followers: 5)
Frontiers in Science     Open Access   (Followers: 1)
Fundamental Research     Open Access  
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Gaudium Sciendi     Open Access  
Ghana Studies     Full-text available via subscription   (Followers: 15)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
Globe, The     Full-text available via subscription   (Followers: 4)
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Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access   (Followers: 1)
History of Science and Technology     Open Access   (Followers: 6)
Hoosier Science Teacher     Open Access  
Indian Journal of History of Science     Hybrid Journal   (Followers: 3)
Instruments     Open Access  
Interciencia     Open Access  
International Annals of Science     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Applied Science     Open Access  
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 10)
International Science and Technology Journal of Namibia     Open Access   (Followers: 2)
International Scientific and Vocational Studies Journal     Open Access  
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Investigacion y Ciencia     Open Access   (Followers: 1)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
iScience     Open Access   (Followers: 2)
Issues in Science & Technology     Free   (Followers: 8)
Ithaca : Viaggio nella Scienza     Open Access  
J : Multidisciplinary Scientific Journal     Open Access  
Jaunujų mokslininkų darbai     Open Access   (Followers: 3)
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 9)
Journal of Advanced Research     Open Access   (Followers: 2)
Journal of Analytical Science & Technology     Open Access   (Followers: 5)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Journal of Big History     Open Access   (Followers: 4)
Journal of Composites Science     Open Access   (Followers: 4)
Journal of Diversity Management     Open Access   (Followers: 4)
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Institute of Science and Technology     Open Access  
Journal of King Saud University - Science     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Negative and No Positive Results     Open Access  
Journal of Responsible Technology     Open Access  
Journal of Science and Technology     Open Access   (Followers: 2)
Journal of Science and Technology     Open Access   (Followers: 1)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
Journal of Science and Technology Policy Management     Hybrid Journal   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Journal of Scientific Research and Reports     Open Access   (Followers: 1)
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Journal of Social Science Research     Open Access   (Followers: 2)
Journal of Taibah University for Science     Open Access  
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of the History of Ideas     Full-text available via subscription   (Followers: 168)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 4)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 49)
Journal of the South Carolina Academy of Science     Open Access  
Journal of Unsolved Questions     Open Access  
Jurnal Sains Dasar     Open Access  
Jurnal Teknosains     Open Access  
Karaelmas Science and Engineering Journal     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kennedy Institute of Ethics Journal     Full-text available via subscription   (Followers: 10)
Logo STI Science, Technology and Innovation     Open Access   (Followers: 14)
Malawi Journal of Science and Technology     Open Access   (Followers: 6)
Maskana     Open Access  
MethodsX     Open Access  
Mètode Science Studies Journal : Annual Review     Open Access  
Modern Applied Science     Open Access   (Followers: 1)
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
National Academy Science Letters     Hybrid Journal   (Followers: 3)
National Science Review     Hybrid Journal   (Followers: 1)
Natural Sciences     Open Access  
Natural Sciences Education     Hybrid Journal   (Followers: 1)
Naturen     Full-text available via subscription  
Nepal Journal of Science and Technology     Open Access  
Network Science     Hybrid Journal   (Followers: 4)
Nordic Journal of Science and Technology     Open Access   (Followers: 2)
Nordic Studies in Science Education     Open Access   (Followers: 3)
Nova     Open Access  
Open Conference Proceedings Journal     Open Access  
Open Journal of Applied Sciences     Open Access  
Orbis Cógnita : Revista Científica     Open Access   (Followers: 2)
Patterns     Open Access   (Followers: 9)
People and Nature     Open Access   (Followers: 4)
Población y Desarrollo - Argonautas y caminantes     Open Access  
Politique et Sociétés     Full-text available via subscription   (Followers: 1)
Portal de la Ciencia     Open Access  
Proceedings of the Indian National Science Academy     Full-text available via subscription   (Followers: 5)
Proceedings of the Linnean Society of New South Wales     Full-text available via subscription   (Followers: 2)
Proceedings of the Royal Society of Queensland, The     Full-text available via subscription  
QScience Connect     Open Access  
Quantum Science and Technology     Hybrid Journal   (Followers: 15)
Rafidain Journal of Science     Open Access  
Rehabilitation Research, Policy, and Education     Hybrid Journal   (Followers: 2)
Reportes Científicos de la FaCEN     Open Access  
Reports in Advances of Physical Sciences     Open Access  
Research Ideas and Outcomes     Open Access  
Research Integrity and Peer Review     Open Access  
Research Policy : X     Open Access   (Followers: 3)
Respuestas     Open Access  
Revista Bases de la Ciencia     Open Access  
Revista Cientifica Guillermo de Ockham     Open Access  
Revista Conhecimento Online     Open Access  
Revista Crítica de Ciências Sociais     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Universidad del Zulia     Open Access  
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SAINSTIS     Open Access  
Sainteknol : Jurnal Sains dan Teknologi     Open Access  
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Science     Full-text available via subscription   (Followers: 5080)
Science & Diplomacy     Free   (Followers: 3)
Science Advances     Free   (Followers: 44)
Science and Technology     Open Access   (Followers: 2)
Science Heritage Journal     Open Access  
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Elkawnie : Journal of Islamic Science and Technology
Number of Followers: 0  

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ISSN (Print) 2460-8912 - ISSN (Online) 2460-8920
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  • Clustering and Risk Analysis of The Earthquake in Sulawesi Using Mini
           Batch K-Means, K-Medoids, and Maximum Likelihood Method

    • Authors: Amirin Kusmiran
      Pages: 1 - 23
      Abstract: Abstract: The earthquake events have been widely analyzed using a statistical approach. Therefore, the sole purpose of this research is clustering and risk analysis of earthquake events based on the combination of machine learning and statistics. The machine learning, conducted by Mini Batch K-Means and K-Medoids, is validated by the Davies-Bouldin index method to earthquake events cluster. Furthermore, the statistics approach conducted by the maximum likelihood method is to estimate the b-value and a-value of earthquake events. The data used in the earthquake events analysis in Sulawesi have a magnitude  5 SR during the period 1980-2022. The results show that the Mini Batch K-Means method is more efficient and accurate than the K-Medoids, and can cluster the earthquakes, namely cluster 0 below 100 km (shallow earthquake), cluster 1 above 100 km to 350 km (medium earthquake), cluster 2 above 350 km (deep earthquake), while K-Medoids method has two clusters namely cluster 0 below 100 km (shallow earthquake), and cluster 1 above 100 km to 350 km. The regions with b-value and a-value less than 0.9 and 7.5, respectively, and in cluster 0, namely the western part of North Sulawesi, Gorontalo, Middle Sulawesi, and West Sulawesi  Province, are as vulnerable to earthquake disasters. Meanwhile, the region in cluster 1 and cluster 2 with b-value and a-value more than 0.9 and 7.5 respectively namely South Sulawesi, the Northern part of North Sulawesi, and Southeast Sulawesi Province, are categorized as minor earthquake disasters. Furthermore, the clustering and risk analysis based on these methods results are good performance, which has recognised cluster and vulnerability of the earthquake events.Abstrak: Kejadian gempa bumi telah banyak dianalisis dengan menggunakan pendekatan statistik. Oleh karena itu, tujuan penelitian untuk menganalisis kejadian gempa dengan menggunakan kombinasi pendekatan machine learning dengan statistik. Pendekatan machine learning dilakukan dengan metode baru yakni metode Mini Batch K-Means dan K-Medoids yang divalidasi dengan metode Davies-Bouldin indeks yang digunakan untuk mengklaster kejadian gempa, sedangkan pendekatan secara statistik dilakukan dengan metode maximum likelihood untuk mengestimasi kerentanan gempa bumi berdasarkan nilai-b dan nilai-a. Data yang digunakan yakni data kejadian gempa di Sulawesi dengan magnitudo ≥ 5 SR dengan periode 1980-2022. Hasil menunjukan bahwa metode Mini Batch K-Means lebih effisien dan akurat dibandingkan dengan metode K-Medoids, dan mengklasifikasi tiga klaster kedalaman gempa, yakni klaster 0 dengan kedalaman kurang dari 100 km (gempa dangkal), klaster 1 dengan kedalaman diantara 100 km dengan 350 km (gempa menengah), klaster 2 dengan kedalaman lebih dari 350 km (gempa dalam). Sementara metode K-Medoids dua klaster kedalama gempa, yakni klaster 0 dengan kedalaman dibawah 100 km (gempa dangkal), dan klaster 1 dengan kedalaman lebih dari 100 km. Beberapa wilayah yang mempunyai nilai-b dan nilai-a secara berurutan kurang dari 0,9 dan 7,5 dan termasuk ke dalam klaster 0, yakni Provinsi Sulawesi Utara bagian barat, Gorontalo, Sulawesi Tengah, dan Sulawesi Barat dikategorikan rawan terhadap bencana gempa; Sedangkan wilayah yang termasuk ke dalam klaster 1 dan klaster 2 dengan nilai-b dan nilai-a secara berurutan lebih dari 0,9 dan 7,5 yakni Provinsi Sulawesi Selatan, Sulawesi Utara bagian Utara, dan Sulawesi Tenggara dikategorikan sebagai rendah terhadap bencana gempa. Dengan demikian, kedua metode dapat digunakan untuk meng-klaster gempa dan identifikasi kerentanan kejadian gempa bumi.
      PubDate: 2023-08-18
      DOI: 10.22373/ekw.v8i2.13027
      Issue No: Vol. 9, No. 1 (2023)
       
  • Characteristics of Liquid Smoke From Young Coconut Shells at Various
           Pyrolysis Temperature

    • Authors: Ressa Fitra Adinda, Muhammad Faisal, Fauzi Muhammad Djuned
      Pages: 24 - 36
      Abstract: Abstract: Young coconut shells contain wood components, such as hemicellulose, cellulose, and lignin. These compounds can be used as raw materials for liquid smoke. The physical and biological characteristics of liquid smoke from young coconut shells pyrolysed at various temperatures were investigated in this study. Specifically, young coconut shells were pyrolysed at 300°C–420°C in a slow pyrolysis reactor. To eliminate tar, the liquid smoke was distilled at 190°C. Further, the chemical content of the liquid smoke was quantified using Gas Chromatography-Mass Spectrometry (GC-MS). Acetic acid and phenol compounds were identified using high performance liquid chromatography (HPLC) and ultraviolet-vis spectrophotometry. The gas chromatography-mass spectrometry (GC-MS) data revealed that liquid smoke contains over 15 chemical components, including phenolic acid, carboxylic acid and its derivatives. Antibacterial, minimum inhibitory concentration (MIC) and minimum killing concentration (MKC) tests were performed to analyse the antimicrobial properties of liquid smoke in inhibiting the growth of Escherichia coli and Salmonella enterica sv Typhimurium. The pyrolysis temperatures affected the composition of the produced liquid smoke. The highest phenol and acetic acid content were found at 340°C and 380°C, where lignin is degraded into phenolic compounds and cellulose is degraded to produce acetic acid. The results of the antibacterial test showed that the maximum inhibition zone was obtained at 420°C, and at 340°C and 380°C the bacteria were inhibited and died.Abstrak: Tempurung kelapa muda mengandung komponen kayu seperti hemiselulosa, selulosa, dan lignin. Senyawa ini dapat digunakan sebagai bahan baku asap cair. Karakteristik fisik dan biologis asap cair dari tempurung kelapa muda yang dipirolisis pada berbagai suhu diselidiki dalam penelitian ini. Tempurung kelapa muda dipirolisis pada suhu 300 °C - 420 °C dalam reaktor pirolisis lambat. Untuk menghilangkan tar asap cair didistilasi pada suhu 190 °C. Selanjutnya, kandungan senyawa kimia asap cair dikuantifikasi menggunakan gas chromatography-mass spectrometry (GC-MS). Senyawa asam asetat dan fenol diidentifikasi menggunakan high performance liquid chromatography (HPLC) dan Spektrofotometri UV-Vis. Data gas chromatography-mass spectrometry (GC-MS) menunjukkan bahwa asap cair mengandung lebih dari 15 komponen kimia, termasuk asam fenolik, asam karboksilat dan turunannya. Uji antibakteri, Minimum Inhibitory Concentrantion (MIC) dan Minimum Killing Concentrantion (MKC) dilakukan untuk menganalisis sifat antimikroba asap cair dalam menghambat pertumbuhan Escherichia coli dan Salmonella enterica sv Typhimurium. Temperatur pirolisis mempengaruhi komposisi asap cair yang dihasilkan. Kandungan fenol dan asam asetat tertinggi ditemukan pada suhu 340°C dan 380°C, dimana pada suhu tersebut lignin terdegradasi menjadi senyawa fenol dan selulosa terdegradasi menghasilkan asam asetat. Hasil uji antibakteri menunjukkan bahwa zona hambat maksimum diperoleh pada suhu 420 °C, pada suhu 340 °C dan 380 °C bakteri ditemukan terhambat dan mati.
      PubDate: 2023-08-18
      DOI: 10.22373/ekw.v9i1.14225
      Issue No: Vol. 9, No. 1 (2023)
       
  • Production of Graphene By Coconut Shell As an Electrode Primary Battery
           Cell

    • Authors: Elsa Pasaribu, Rikson Siburian, Minto Supeno
      Pages: 37 - 47
      Abstract: Abstract: Coconut shells are a natural resource that contains a lot of carbon (C). The pyrolysis process can be used to create coconut shells. A single layer of carbon atoms that have undergone sp2 hybridization to form a hexagonal, two-dimensional structure is known as Graphene. Graphene has excellent potential for battery manufacturing applications, supercapacitors, etc. Activated carbon and the pyrolisis method of producing Graphene were combined and heated to 600 oC for one hour. The graphene generated is assessed using an XRD, SEM-EDX, TEM, Raman, and conductometer. The results of the X-ray diffractogram analysis revealed that the peaks at 2θ = 23,87o and 44,5o are not particularly sharp and slightly broadened. It means Graphene are well formed. SEM-EDX investigation reveals that the surface size and shape structure is smaller and thinner, a flat pile dominated by carbon atoms. The result of conductometer analysis shows the electrical conductivity of Graphene is quite good, but Graphene can still not control the movement of electrons. Graphene has layer distances between Graphene and Graphene layers are 3.3 Å (TEM data), with many Graphene layers being 0.85 (multi-layer) (Raman data).Abstrak: Batok kelapa merupakan salah satu sumber daya alam yang mengandung banyak karbon (C). Proses pirolisis dapat digunakan untuk membuat batok kelapa. Satu lapisan atom karbon yang telah mengalami hibridisasi sp2 untuk membentuk struktur dua dimensi heksagonal dikenal sebagai Grafena. Grafena memiliki potensi besar untuk aplikasi pembuatan baterai, superkapitasitor, dan sebagainya. Karbon aktif dengan metode pirolisis untuk memproduksi Grafena dipanaskan hingga 600 oC selama satu jam. Grafena yang dihasilkan dikarakterisasi menggunakan XRD, SEM-EDX, TEM, Raman, and Konductometer. Hasil analisis difraktogram sinar-X mengungkapkan bahwa puncak pada 2θ = 24,22o dan 44o tidak terlalu tajam dan sedikit melebar. Ini berarti Grafena terbentuk dengan baik. Analisis SEM-EDX mengungkapkan bahwa ukuran permukaan dan struktur bentuk lebih kecil dan lebih tipis dan itu adalah tumpukan datar yang didominasi oleh atom karbon. Hasil analisis konduktometer menunjukkan konduktivitas listrik Grafena cukup baik, namun Grafena masih belum mampu mengontrol pergerakan elektron. Grafena memiliki jarak lapisan antara lapisan  Grafena dan Grafena adalah 3,3 Å (data TEM) dengan jumlah lapisan Grafena adalah 0,85 (multilapisan) (data Raman).
      PubDate: 2023-08-18
      DOI: 10.22373/ekw.v9i1.14880
      Issue No: Vol. 9, No. 1 (2023)
       
  • Atomic Structure and Its Connection to The Quranic Verses' Context

    • Authors: Abdul Mujala, Muhammad Reza, Kana Puspita
      Pages: 48 - 60
      Abstract: Abstract: The growth of science in the twenty-first century, particularly in chemistry, is critically dependent on the integration of science and the Qur'an. Since numerous verses in the Qur'an disclose the fundamental principles of chemistry, such as the size of an atom, the integration of science and the Qur'an is nothing new in modern science, especially chemistry. As a result, this article will go into further detail regarding the atomic structure's physical setting and how it relates to Qur'anic verses. Writing this paper involved conducting literature searches on both contemporary science and Qur'anic interpretations of atomic structure. The word "dzarrah" appears in QS Az-Zalzalah verses 7-8, An-Nisa verse 40, and Yunus verse 61, and is interpreted as the size of a mustard seed that the human intellect may yet attain. However, "dzarrah" is often frequently interpreted as atomic size, since the atomic radius of the smallest atom (Hydrogen) and biggest atom (Organesson) atoms are 1.2 x 10-10 m and 1.52 x 10-10 m, respectively, with 1 million being smaller than the radius of mustard seed (5 x 10-4 m). Thus, the word dzarrah, which is translated as the size of a mustard seed, is less proportional to describe a much smaller atomic size. This atomic scale later served as a precursor for new developments in chemical research, such as nanomaterials and quantum dots.Abstrak: Integrasi sains dan Al-Qur’an menjadi dasar yang penting untuk pengembangan ilmu sains pada abad ke-21, khususnya dalam ilmu kimia. Integrasi sains dengan Al-Qur’an sebetulnya bukanlah hal baru dalam sains modern, khususnya kimia, karena ada banyak ayat-ayat Al-Qur’an yang mengungkapkan tentang konsep dasar kimia, misalnya ukuran atom. Oleh karena itu, artikel ini akan membahas secara lebih jelas tentang konteks materi struktur atom dan kaitannya dengan ayat-ayat Al-Qur’an. Metode penulisan artikel ini menggunakan kajian literatur, baik itu dari segi sains modern dan tafsir Al-Qur’an tentang struktur atom. Kata “dzarrah” muncul dalam QS Az-Zalzalah ayat 7-8, QS An-Nisa ayat 40, dan QS Yunus ayat 61, yang ditafsirkan seukuran biji sawi yang ukurannya masih dapat dijangkau oleh pikiran manusia. Namun, “dzarrah” juga kerap diterjemahkan seukuran atom, padahal jari-jari 1 atom paling kecil (Hidrogen) dan paling besar (Organesson) berturut-turut adalah 1,2 x 10-10 m dan 1,52 x 10-10 m, dimana 1 juta lebih kecil dari jari-jari biji sawi (5 x 10-4 m). Sehingga kata dzarrah yang diterjemahkan sebagai ukuran biji sawi kurang proporsional untuk menggambarkan ukuran atom yang jauh lebih kecil. Ukuran atom ini kemudian menjadi cikal bakal perkembangan penelitian di bidang kimia, misalnya nanomaterial dan quantum dots.
      PubDate: 2023-08-18
      DOI: 10.22373/ekw.v9i1.14842
      Issue No: Vol. 9, No. 1 (2023)
       
  • Synthesis of Carbon Dots From Empty Fruit Bunch Biochar an Acid-Free
           Hydrothermal Method

    • Authors: Marpongahtun Marpongahtun, Rufina Pramudita, Saharman Gea, Amru Daulay
      Pages: 61 - 70
      Abstract: Abstract: Carbon dots have gained much interest due to their outstanding optical and electrical properties, making them useful for a wide range of applications. Here Empty fruit bunch (EFB) biochar was used as a carbon source in a straightforward, environmentally friendly, and reproducible hydrothermal method for producing carbon quantum dots. In this study, the role of the hydrothermal process was seen and studied by comparing the shape and fluorescence. Exciting results from HRTEM show that the carbon quantum dots in the sample are 4 nm in size. The obtained CD emits bright blue luminescence, and the absorption peak of the carbon dots was observed in the UV region with maximum absorption at 205 nm and 322 nm. The light CD shows an intense sky blue color upon illumination by a UV-light source at 365 nm. The intensity of the photoluminescence (PL) spectra sharply increases with decreasing concentration of carbon dots. Meanwhile, the CD exhibited excitation-dependence, photo-stability, and well dispersibility. These results suggest that the present CD are potential applications in optoelectronics and imaging.Abstrak: Karbon dots telah menarik banyak perhatian karena sifat listrik dan optik yang luar biasa, sehingga dapat digunakan untuk berbagai aplikasi. Penelitian ini, menggunakan biochar tandan buah kosong (EFB) sebagai sumber karbon dengan metode hidrotermal yang ramah lingkungan untuk menghasilkan karbon dots. Hasil HR-TEM yang menarik menunjukkan bahwa sampel karbon dots berukuran 4 nm. Karbon dots yang diperoleh memancarkan sinar biru terang dan puncak serapan titik karbon diamati pada spektrofotometri Uv-Vis dengan serapan maksimum pada 205 nm dan 322 nm. Intensitas karbon dots menunjukkan warna biru langit di cahaya UV pada 365 nm. Intensitas spektroskopi luminesens meningkat tajam dengan menurunnya konsentrasi titik karbon. Sementara itu, karbon dots menunjukkan eksitasi, stabilitas, dan dispersibilitas baik. Hasil ini menunjukkan bahwa karbon dots dapat digunakan pada beberapa aplikasi seperti dalam optoelektronik dan pencitraan.
      PubDate: 2023-08-18
      DOI: 10.22373/ekw.v9i1.14524
      Issue No: Vol. 9, No. 1 (2023)
       
 
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  Subjects -> SCIENCES: COMPREHENSIVE WORKS (Total: 374 journals)
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Accountability in Research: Policies and Quality Assurance     Hybrid Journal   (Followers: 19)
Acta Nova     Open Access   (Followers: 2)
Acta Scientifica Malaysia     Open Access   (Followers: 1)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
Adıyaman University Journal of Science     Open Access  
Advanced Science     Open Access   (Followers: 16)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 8)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advances in Research     Open Access  
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 7)
Afrique Science : Revue Internationale des Sciences et Technologie     Open Access   (Followers: 1)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 3)
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 12)
American Academic & Scholarly Research Journal     Open Access   (Followers: 4)
American Journal of Applied Sciences     Open Access   (Followers: 22)
American Journal of Humanities and Social Sciences     Open Access   (Followers: 13)
Anales del Instituto de la Patagonia     Open Access  
Applied Mathematics and Nonlinear Sciences     Open Access   (Followers: 2)
Arab Journal of Basic and Applied Sciences     Open Access  
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 1)
Archives Internationales d'Histoire des Sciences     Partially Free   (Followers: 5)
Archives of Current Research International     Open Access  
ARPHA Conference Abstracts     Open Access   (Followers: 1)
ARPHA Proceedings     Open Access  
Asian Journal of Advanced Research and Reports     Open Access  
Asian Journal of Scientific Research     Open Access   (Followers: 2)
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 5)
Australian Field Ornithology     Full-text available via subscription   (Followers: 1)
Australian Journal of Social Issues     Hybrid Journal   (Followers: 6)
Bangladesh Journal of Scientific Research     Open Access  
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 1)
Berichte Zur Wissenschaftsgeschichte     Hybrid Journal   (Followers: 11)
Bilge International Journal of Science and Technology Research     Open Access  
Bioethics Research Notes     Full-text available via subscription   (Followers: 15)
BJHS Themes     Open Access   (Followers: 1)
Bulletin de la Société Royale des Sciences de Liège     Open Access  
Bulletin of the National Research Centre     Open Access  
Chain Reaction     Full-text available via subscription  
Ciencia Amazónica (Iquitos)     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencia Ergo Sum     Open Access  
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Communications Faculty of Sciences University of Ankara Series A2-A3 Physical Sciences and Engineering     Open Access  
Comunicata Scientiae     Open Access  
Conference Papers in Science     Open Access  
Configurations     Full-text available via subscription   (Followers: 11)
COSMOS     Hybrid Journal   (Followers: 1)
Crea Ciencia Revista Científica     Open Access  
Current Issues in Criminal Justice     Hybrid Journal   (Followers: 14)
Current Research in Geoscience     Open Access   (Followers: 6)
Data     Open Access   (Followers: 4)
Dhaka University Journal of Science     Open Access  
Discover Sustainability     Open Access   (Followers: 5)
Einstein (São Paulo)     Open Access  
Ekaia : EHUko Zientzia eta Teknologia aldizkaria     Open Access  
Emergent Scientist     Open Access  
Enhancing Learning in the Social Sciences     Open Access   (Followers: 7)
Enseñanza de las Ciencias : Revista de Investigación y Experiencias Didácticas     Open Access  
Entramado     Open Access  
Entre Ciencia e Ingeniería     Open Access  
Epiphany     Open Access   (Followers: 1)
Ethiopian Journal of Education and Sciences     Open Access   (Followers: 5)
European Online Journal of Natural and Social Sciences     Open Access   (Followers: 4)
European Scientific Journal     Open Access   (Followers: 7)
Evidência - Ciência e Biotecnologia - Interdisciplinar     Open Access  
Exchanges : the Warwick Research Journal     Open Access   (Followers: 1)
Experimental Results     Open Access   (Followers: 2)
Fides et Ratio : Revista de Difusión Cultural y Científica     Open Access  
Fontanus     Open Access   (Followers: 1)
Forensic Science Policy & Management: An International Journal     Hybrid Journal   (Followers: 252)
Frontiers in Climate     Open Access   (Followers: 5)
Frontiers in Science     Open Access   (Followers: 1)
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Futures & Foresight Science     Hybrid Journal   (Followers: 1)
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Ghana Studies     Full-text available via subscription   (Followers: 15)
Global Journal of Pure and Applied Sciences     Full-text available via subscription  
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HardwareX     Open Access  
Heidelberger Jahrbücher Online     Open Access  
Heliyon     Open Access   (Followers: 1)
History of Science and Technology     Open Access   (Followers: 6)
Hoosier Science Teacher     Open Access  
Indian Journal of History of Science     Hybrid Journal   (Followers: 3)
Instruments     Open Access  
Interciencia     Open Access  
International Annals of Science     Open Access  
International Journal of Advanced Multidisciplinary Research and Review     Open Access  
International Journal of Applied Science     Open Access  
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Network Science     Hybrid Journal   (Followers: 3)
International Journal of Social Sciences and Management     Open Access   (Followers: 2)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 10)
International Science and Technology Journal of Namibia     Open Access   (Followers: 2)
International Scientific and Vocational Studies Journal     Open Access  
Investiga : TEC     Open Access  
Investigación Joven     Open Access  
Investigacion y Ciencia     Open Access   (Followers: 1)
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
iScience     Open Access   (Followers: 2)
Issues in Science & Technology     Free   (Followers: 8)
Ithaca : Viaggio nella Scienza     Open Access  
J : Multidisciplinary Scientific Journal     Open Access  
Jaunujų mokslininkų darbai     Open Access   (Followers: 3)
Journal de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription  
Journal of Chromatography & Separation Techniques     Open Access   (Followers: 9)
Journal of Advanced Research     Open Access   (Followers: 2)
Journal of Analytical Science & Technology     Open Access   (Followers: 5)
Journal of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
Journal of Applied Sciences and Environmental Management     Open Access   (Followers: 1)
Journal of Big History     Open Access   (Followers: 4)
Journal of Composites Science     Open Access   (Followers: 4)
Journal of Diversity Management     Open Access   (Followers: 4)
Journal of Indian Council of Philosophical Research     Hybrid Journal  
Journal of Institute of Science and Technology     Open Access  
Journal of King Saud University - Science     Open Access  
Journal of Mathematical and Fundamental Sciences     Open Access  
Journal of Negative and No Positive Results     Open Access  
Journal of Responsible Technology     Open Access  
Journal of Science and Technology     Open Access   (Followers: 2)
Journal of Science and Technology     Open Access   (Followers: 1)
Journal of Science and Technology (Ghana)     Open Access   (Followers: 3)
Journal of Science and Technology Policy Management     Hybrid Journal   (Followers: 1)
Journal of Science Foundation     Open Access   (Followers: 1)
Journal of Scientific Research and Reports     Open Access   (Followers: 1)
Journal of Shanghai Jiaotong University (Science)     Hybrid Journal  
Journal of Social Science Research     Open Access   (Followers: 2)
Journal of Taibah University for Science     Open Access  
Journal of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
Journal of the History of Ideas     Full-text available via subscription   (Followers: 168)
Journal of the Indian Institute of Science     Hybrid Journal   (Followers: 4)
Journal of the Royal Society of New Zealand     Hybrid Journal   (Followers: 49)
Journal of the South Carolina Academy of Science     Open Access  
Journal of Unsolved Questions     Open Access  
Jurnal Sains Dasar     Open Access  
Jurnal Teknosains     Open Access  
Karaelmas Science and Engineering Journal     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kennedy Institute of Ethics Journal     Full-text available via subscription   (Followers: 10)
Logo STI Science, Technology and Innovation     Open Access   (Followers: 14)
Malawi Journal of Science and Technology     Open Access   (Followers: 6)
Maskana     Open Access  
MethodsX     Open Access  
Mètode Science Studies Journal : Annual Review     Open Access  
Modern Applied Science     Open Access   (Followers: 1)
Momona Ethiopian Journal of Science     Open Access   (Followers: 5)
National Academy Science Letters     Hybrid Journal   (Followers: 3)
National Science Review     Hybrid Journal   (Followers: 1)
Natural Sciences     Open Access  
Natural Sciences Education     Hybrid Journal   (Followers: 1)
Naturen     Full-text available via subscription  
Nepal Journal of Science and Technology     Open Access  
Network Science     Hybrid Journal   (Followers: 4)
Nordic Journal of Science and Technology     Open Access   (Followers: 2)
Nordic Studies in Science Education     Open Access   (Followers: 3)
Nova     Open Access  
Open Conference Proceedings Journal     Open Access  
Open Journal of Applied Sciences     Open Access  
Orbis Cógnita : Revista Científica     Open Access   (Followers: 2)
Patterns     Open Access   (Followers: 9)
People and Nature     Open Access   (Followers: 4)
Población y Desarrollo - Argonautas y caminantes     Open Access  
Politique et Sociétés     Full-text available via subscription   (Followers: 1)
Portal de la Ciencia     Open Access  
Proceedings of the Indian National Science Academy     Full-text available via subscription   (Followers: 5)
Proceedings of the Linnean Society of New South Wales     Full-text available via subscription   (Followers: 2)
Proceedings of the Royal Society of Queensland, The     Full-text available via subscription  
QScience Connect     Open Access  
Quantum Science and Technology     Hybrid Journal   (Followers: 15)
Rafidain Journal of Science     Open Access  
Rehabilitation Research, Policy, and Education     Hybrid Journal   (Followers: 2)
Reportes Científicos de la FaCEN     Open Access  
Reports in Advances of Physical Sciences     Open Access  
Research Ideas and Outcomes     Open Access  
Research Integrity and Peer Review     Open Access  
Research Policy : X     Open Access   (Followers: 3)
Respuestas     Open Access  
Revista Bases de la Ciencia     Open Access  
Revista Cientifica Guillermo de Ockham     Open Access  
Revista Conhecimento Online     Open Access  
Revista Crítica de Ciências Sociais     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Universidad del Zulia     Open Access  
Revista Politécnica     Open Access  
Revista Tecnológica     Open Access  
Revista UniVap     Open Access  
SAINSTIS     Open Access  
Sainteknol : Jurnal Sains dan Teknologi     Open Access  
Sci     Open Access  
Science     Full-text available via subscription   (Followers: 5080)
Science & Diplomacy     Free   (Followers: 3)
Science Advances     Free   (Followers: 44)
Science and Technology     Open Access   (Followers: 2)
Science Heritage Journal     Open Access  
Science World Journal     Open Access  
Science, Technology and Arts Research Journal     Open Access   (Followers: 1)
ScienceRise     Open Access  
Sciences du jeu     Open Access  

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