Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
    - CHEMISTRY (661 journals)
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    - ELECTROCHEMISTRY (28 journals)
    - INORGANIC CHEMISTRY (45 journals)
    - ORGANIC CHEMISTRY (47 journals)
    - PHYSICAL CHEMISTRY (65 journals)

CHEMISTRY (661 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
Accounts of Materials Research     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 32)
ACS Applied Polymer Materials     Hybrid Journal   (Followers: 15)
ACS Catalysis     Hybrid Journal   (Followers: 57)
ACS Chemical Neuroscience     Hybrid Journal   (Followers: 26)
ACS Combinatorial Science     Hybrid Journal   (Followers: 13)
ACS Environmental Au     Open Access   (Followers: 10)
ACS Macro Letters     Hybrid Journal   (Followers: 29)
ACS Materials Letters     Open Access   (Followers: 7)
ACS Medicinal Chemistry Letters     Hybrid Journal   (Followers: 45)
ACS Nano     Hybrid Journal   (Followers: 223)
ACS Photonics     Hybrid Journal   (Followers: 16)
ACS Symposium Series     Full-text available via subscription   (Followers: 5)
ACS Synthetic Biology     Hybrid Journal   (Followers: 38)
Acta Chemica Malaysia     Open Access   (Followers: 2)
Acta Chimica Slovaca     Open Access   (Followers: 4)
Acta Chimica Slovenica     Open Access   (Followers: 4)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 10)
Acta Scientifica Naturalis     Open Access   (Followers: 4)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 9)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 12)
Adsorption Science & Technology     Open Access   (Followers: 9)
Advanced Electronic Materials     Hybrid Journal   (Followers: 13)
Advanced Functional Materials     Hybrid Journal   (Followers: 76)
Advanced Journal of Chemistry, Section A     Open Access   (Followers: 4)
Advanced Journal of Chemistry, Section B     Open Access   (Followers: 1)
Advanced Science Focus     Free   (Followers: 8)
Advanced Theory and Simulations     Hybrid Journal   (Followers: 5)
Advanced Therapeutics     Hybrid Journal   (Followers: 1)
Advances in Chemical Engineering and Science     Open Access   (Followers: 131)
Advances in Chemical Science     Open Access   (Followers: 52)
Advances in Chemistry     Open Access   (Followers: 37)
Advances in Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 15)
Advances in Environmental Chemistry     Open Access   (Followers: 13)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 34)
Advances in Nanoparticles     Open Access   (Followers: 17)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Polymer Science     Hybrid Journal   (Followers: 49)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Sample Preparation     Open Access   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 18)
Aerosol Science and Engineering     Hybrid Journal   (Followers: 2)
African Journal of Chemical Education     Open Access   (Followers: 6)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 6)
Aggregate     Open Access   (Followers: 1)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alchemy : Journal of Chemistry     Open Access   (Followers: 2)
Alchemy : Jurnal Penelitian Kimia     Open Access  
Alfarama Journal of Basic & Applied Sciences     Open Access   (Followers: 8)
Alotrop     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 45)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 21)
American Journal of Chemistry     Open Access   (Followers: 37)
American Journal of Plant Physiology     Open Access   (Followers: 9)
Analyst     Hybrid Journal   (Followers: 35)
Analytical Science Advances     Open Access   (Followers: 1)
Angewandte Chemie     Hybrid Journal   (Followers: 169)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 275)
Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 6)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 4)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 5)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 14)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Antiviral Chemistry and Chemotherapy     Open Access   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 20)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 4)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Applied Chemistry Research     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 2)
Asian Journal of Chemical Sciences     Open Access   (Followers: 1)
Asian Journal of Chemistry and Pharmaceutical Sciences     Open Access  
Asian Journal of Physical and Chemical Sciences     Open Access   (Followers: 2)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 8)
Autophagy     Hybrid Journal   (Followers: 8)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Hybrid Journal   (Followers: 248)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 5)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 2)
Biomacromolecules     Hybrid Journal   (Followers: 24)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 3)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 85)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 61)
Bioorganic Chemistry     Hybrid Journal   (Followers: 7)
Biopolymers     Hybrid Journal   (Followers: 15)
Biosensors     Open Access   (Followers: 3)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 3)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of Institute of Chemistry and Chemical Technology, Mongolian Academy of Sciences     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 25)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 5)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 1)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 11)
Canadian Mineralogist     Full-text available via subscription   (Followers: 5)
Carbohydrate Polymer Technologies and Applications     Open Access  
Carbohydrate Polymers     Hybrid Journal   (Followers: 11)
Carbohydrate Research     Hybrid Journal   (Followers: 23)
Carbon     Hybrid Journal   (Followers: 64)
Carbon Capture Science & Technology     Open Access   (Followers: 1)
Carbon Trends     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 9)
Catalysis Science and Technology     Hybrid Journal   (Followers: 10)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 4)
Catalysts     Open Access   (Followers: 12)
Cell Reports Physical Science     Open Access   (Followers: 1)
Cellulose     Hybrid Journal   (Followers: 8)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
Chem     Hybrid Journal   (Followers: 7)
Chem Catalysis     Hybrid Journal   (Followers: 1)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 3)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 22)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Hybrid Journal   (Followers: 83)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 27)
Chemical Physics Impact     Full-text available via subscription   (Followers: 1)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 4)
Chemical Research in Toxicology     Hybrid Journal   (Followers: 22)
Chemical Reviews     Hybrid Journal   (Followers: 212)
Chemical Science     Open Access   (Followers: 43)
Chemical Science International Journal     Open Access  
Chemical Technology     Open Access   (Followers: 75)
Chemical Thermodynamics and Thermal Analysis     Open Access   (Followers: 4)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 4)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 39)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 18)
ChemInform     Hybrid Journal   (Followers: 5)
Chemistry     Open Access  
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Industry     Full-text available via subscription   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 142)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 20)
Chemistry Africa : A Journal of the Tunisian Chemical Society     Hybrid Journal  
Chemistry and Materials Research     Open Access   (Followers: 19)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 7)
Chemistry Education Review     Open Access   (Followers: 2)
Chemistry in Education     Open Access   (Followers: 5)
Chemistry Letters     Full-text available via subscription   (Followers: 43)
Chemistry of Heterocyclic Compounds     Hybrid Journal   (Followers: 5)
Chemistry of Materials     Hybrid Journal   (Followers: 186)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 10)
Chemistry World     Hybrid Journal   (Followers: 20)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 1)
ChemistrySelect     Hybrid Journal  
Chemistry–Methods     Open Access   (Followers: 3)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
ChemNanoMat     Hybrid Journal   (Followers: 1)
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 13)
Chemosensors     Open Access   (Followers: 1)
ChemPhotoChem     Hybrid Journal  
ChemPhysChem     Hybrid Journal   (Followers: 12)
ChemPhysMater     Full-text available via subscription  
ChemPlusChem     Hybrid Journal   (Followers: 2)
Chempublish Journal     Open Access  
ChemSystemsChem     Hybrid Journal   (Followers: 1)
ChemTexts     Hybrid Journal   (Followers: 1)
CHIMIA International Journal for Chemistry     Open Access   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 9)
Chromatographia     Hybrid Journal   (Followers: 21)
Chromatography     Open Access   (Followers: 3)
Chromatography Research International     Open Access   (Followers: 4)
Ciencia     Open Access  
Clay Minerals     Hybrid Journal   (Followers: 9)
Cogent Chemistry     Open Access   (Followers: 3)
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 6)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 2)
Combustion Science and Technology     Hybrid Journal   (Followers: 26)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 1)
Communications Chemistry     Open Access   (Followers: 2)
Communications Materials     Open Access  
Composite Interfaces     Hybrid Journal   (Followers: 6)

        1 2 3 4 | Last

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Advances in Science and Technology
Number of Followers: 18  
  Full-text available via subscription Subscription journal
ISSN (Online) 1662-0356
Published by Scientific.Net Homepage  [14 journals]
  • Phytochemical Compounds and Antioxidants Analysis of Clinacanthus nutans
           Leaf and Stem Extracts

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Saiyidah Nafisah Hasyim, Norrizah Jaafar Sidik, Tay Chia Chay, Nur Nadirah Rodzali, Siti Nur Azmu’i Abdullah, Noor Amira Muhammad
      Clinacanthus nutans consists with multiple medicinal properties. The plant is also known to be a source of biologically active compounds, particularly those with an antioxidant capacity. The phytochemical studies of C. nutans plant extract was mostly reported from its leaf part. Thus, the objectives of this study are to assess the phytochemical constituents and antioxidant activity of C. nutans leaf and stem. Methanol was used as solvent for the green extraction. Next, phytochemical screening, Fourier transform infrared (FTIR) analysis, total phenolic (TPC) and flavonoids contents (TFC), quercetin flavonoid compound analysis and in vitro antioxidant activity were performed on C. nutans leaf and stem. In comparison to stem extract, the leaf extract showed a more favorable appearance of metabolites. In FTIR analysis, both sample extracts revealed the presence of hydroxyl and carbonyl functional groups, which are important in antioxidant action. The TPC (228.06 mg GAE/g DW) and TFC (29.76 mg QE/g DW) values were higher in the leaf extract than the stem extract. Quercetin quantification in HPLC analysis revealed that the leaf extract (21.33 g/g) contained more quercetin than the stem extract (18.88 g/g). Between the extracts, leaf providing more antioxidant values of DPPH (15.50%) and FRAP (15.68 gFeSO4/g) than stem. The greatest association was identified between TFC and FRAP reducing activity (r = 0.977, p<0.05) indicating that the flavonoid present in the extract contributed to C. nutans' antioxidant capacity.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Biofluid Characterisation Using Pin on Disc Experiment from Plant Based

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Mohamad Mazwan Mahat, Izatul Aina Afiqah Mohd Rohazid, Farah Nabillah Kazwa, Nurul Nadiah Kamaldin
      This study focuses on the performance and mechanical characteristics response of pure Canola oil and Canola oil with existence of Hyaluronic Acid. Numerous studies show that plant-based substances are infrequently used in synthetic synovial fluid. The sort of bio-fluid that derives from plant-based oil and can function as a synthetic synovial fluid is the focus of this work. Three samples of a bio-fluid made of Canola oil with three different concentrations of Hyaluronic Acid (HA) are 0 ml, 5 ml, and 10ml, respectively. The 500 mm x 500 mm x 4 mm Polylactic Acid (PLA) biomaterial disc was chosen in the pin on disc wear and friction test rig experiment in conjunction with a canola-based oil tested lubricant to simulate the mechanical principles on the knee. To obtain accurate findings for the wear rate and friction coefficient, the samples will be put through a tribology test. The experiment was conducted to measure the tribology of the stainless pin to observe the effect of coefficient of friction and wear rate on the pin. The reliable outcome may open up new avenues for future research on synthetic synovial fluid. On the other hand, this study is beneficial to medical technology for future treatment of any diseases related to synovial fluid and allows the manufacturer to improve understanding in the optimization of these lubricants in ensuring a long-term application in the human body.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Extraction Yield of Palm Oil and Carotenoids Value from
           Microwave-Sterilized Oil Palm Mesocarp

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Amirah Hanani Kamaruddin, Norashikin Ahmad Zamanhuri, Rafeqah Raslan
      Steam batch sterilization is favorably utilized by conventional palm oil mills in Malaysia. However, there are some disadvantages to using steam batch sterilization, including the fact that it takes a long time to complete the sterilizing process, and a huge amount of wastewater is released as palm oil mill effluent (POME). Besides, extraction by fruit press expeller requires a large number of nuts or seeds to produce a high yield, which is relatively expensive. Therefore, this research aimed to investigate the capability of microwave sterilization and the Soxhlet extraction (solvent extraction) process as an alternative to the conventional method. The impact of various microwave power levels of 400, 600, and 800 W and water ratios of 0, 50, and 100 mL on oil yield and carotenoids value of microwave-sterilized oil palm mesocarp are also investigated. Microwave sterilization and Soxhlet extraction have been employed as a replacement for the conventional method of extracting a higher yield of palm oil mesocarp in order to fill the gap by the previous research, which applied two methods: microwave sterilization (power level) and extraction. Then, carotenoid value analysis with a UV spectrophotometer is utilized to examine the outcomes in order to demonstrate the efficacy of the method. As a result, a high oil yield and carotenoid value are produced, which is 59.31% at 800W with the absence of water (0 mL) and a carotenoid value of 757 ppm at 400W (0 mL), respectively. Meanwhile, other carotenoid values at different microwave power levels and water ratios are still within the acceptable range as per the commercial crude palm oil standard.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Effect of Ga Substitution at Mn Site on Electroresistance Behavior in
           Monovalent Doped La0.85Ag0.15Mn1-xGaxO3 Manganites

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Norazila Ibrahim, Nur Azeni Mohamad Rusop, Rozilah Rajmi
      The effects of Ga substitution at Mn site on electroresistance behaviour of La0.85Ag0.15MnO3 compound prepared by solid-state reaction method were investigated. X-ray diffraction (XRD) measurement were recorded at room temperature and refined by employing Rietveld techniques. Ferromagnetic to paramagnetic transitions behaviour have been observed from ac susceptibility results. Resistivity-temperature curve with different applied currents of 1 mA and 5 mA showed metal-insulator, MI transition temperature, TMI decreased with increased of the applied currents. The increased in applied current caused the maximum resistivity around TMI to be decreased for both samples indicated increased in charge carrier density which resulting in drop of resistivity, hence, enhanced double exchange mechanism. The electroresistance (ER) effects have been investigated. The result showed that the ER effect increases when Ga is substituted.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Finite Element Analysis of Low-Velocity Impact Carbon Fiber-Reinforced
           Polymer (CFRP) Composite Laminate Emphasizing on Meshing Technique

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Mohd Suhairil Meon
      This paper presents the performance of the three-dimensional progressive damage model using Puck failure criteria gradual degradation law to predict the structural responses, as well as the onset and propagation of failure due to different meshing techniques. The proposed damage model is performed using Abaqus explicit analysis. Three meshing strategies are analyzed using a solid element finite element model based on low-velocity impact loading. The structural responses are compared with experimental data taken from literature to measure the performance of such damage model. The results revealed that the models adopted here respond well to experimental data and demonstrate acceptable results in predicting the inter- and intra-laminar damage of the composite laminate.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Removal of Iron and Manganese in Groundwater Using Alum and Potassium

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Khairul Hafiz Shahrul Nizam, Nur Syahiza Zainuddin
      Groundwater has become one of the natural sources of water nowadays. Naturally, groundwater contains dissolving materials such as soils, rocks, and minerals, which later release constituents, including iron (Fe2+) and manganese (Mn). However, raw groundwater has been found to consist of a high concentration of such minerals, which exceed the Groundwater Quality Standard published by the Department of Environment Malaysia. Initially, the concentration of Fe2+ and Mn exceeding the limit mentioned in the standard; 1.0 and 0.2 mg/L, respectively, might affect the quality of the groundwater. Hence, such condition of water needs to be treated before it can be distributed to the user. This study presents the combination usage of alum and potassium permanganate (KMnO4) in removing Fe2+ and Mn in the groundwater. The jar test was the main mechanism used in identifying the best optimum medium dosages (alum and KMnO4) as well as the best contact time for both mediums to efficiently remove Fe2+ and Mn in groundwater. In this study, water samples were taken from Chicha Water Treatment Plant in Kelantan. It can be said that both alum and KMnO4 managed to remove Fe2+ and Mn up to 35% and 45%, respectively when using alum dosage of 12 mg/L and KMnO4 dosage of 1.5mg/L with a contact time of 40 minutes. In addition, both mediums also managed to remove other parameters such as colour, turbidity, cations, and pH.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Surface Chemistry Interaction of Graphene Oxide/Eggshell Adsorbent towards
           Fluoride Removal

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Norhusna Mohamad Nor, Mohamad Ikmal Mohamad Azmir, Nurulhuda Amri
      Fluoride removal is crucial in water sources because its existence is very harmful towards human and environment. With this concern, graphene oxide (GO) has been selected as an adsorbent due to its adsorptive characteristics. GO was modified with eggshell (GO/ES), a natural based of calcium precursor. The modification of the GO/ES adsorbent was done via ultra-sonification. The effects of each synthesis parameter toward fluoride removal were investigated and related to surface functional groups found in the modified GO/ES adsorbent. From the analysis, eggshell has been successfully decorated over GO structure, where GO-calcium bond was observed in the FTIR spectra. The interaction between GO and ES showed the increment of hydroxyl (O-H) and carboxyl (C-O) functional groups as increasing in ES amount. This resulted in increasing of fluoride removal, as high as 54.30 mg/g adsorption capacity. The effects of GO/ES ration, sonication temperature and synthesis time in tailoring the modified GO/ES adsorbent were also significant in the arrangement of these functional groups towards fluoride removal. Based on the results obtained, it can be concluded that modified GO/ES adsorbent, from natural calcium source is comparable with chemical based calcium source, where the same functional groups were observed from FTIR spectra.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Effect of Titanium Doping on Structure and Morphology of
           LiNi0.3Mn0.3Co0.3Al0.1O2 Cathode Materials

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Kelimah Elong, Muhd Firdaus Kasim, Zurina Osman
      Lithium nickel cobalt manganese oxide, LiNi1/3Co1/3Mn1/3O2 (NMC 333) become a promising cathode material and attracted much attention to replace the LiCoO2. The structure, particle size, and morphology are some of the factors that influence the performance of the NMC 333 materials were study in this work. The synthesis method of doped NMC 333 materials was done via combustion method and citric acid was used as a fuel. The final products of LiNi0.3Mn0.3Co0.3Al0.1O2 and LiNi0.3Mn0.3Co0.3Al0.05Ti0.05O2 were denoted as 333A and 333AT, respectively. Based on the XRD results, all materials showed a pure, single phase and isostructural with hexagonal α-NaFeO2. 333AT material show good cation ordering with RIR value of 1.25. It also shows the higher (003) peak intensity and smaller full widths at half maximum (FWHM) indicate this material has higher structural crystallinity and smaller crystallite size than 333A. Meanwhile, FESEM results revealed that all materials have morphology of polyhedral like shape and well-crystallized particles with smooth surfaces. Both materials clearly made up of micro-sized particles with the range particle size from 103 nm to 975 nm. 333A material display slightly larger crystallite size compared to the 333AT material. As a conclusion, doping technique will effect the structural and the morphology of materials.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Coconut Shell Ash (CSA) as the Stabilizer for Soft Soil Treatment

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Abdul Samad Abdul Rahman, Norbaya Sidek, Sulaiman Hasim, Juhaizad Ahmad, Mohd Ikmal Mohd Fazlan, Nur Syazwana Mohamad
      Soft soil consists of inherent properties where it is unstable in geotechnical condition with low shear strength. The present of soft soil is one of the problematic ground conditions that can pose great challenges in the related field. Moreover, soft soil is not suitable for being used in the construction of highways and buildings due to its undesirable characteristics such as high-water content, low shear strength, low bearing capacity and low permeability. Thus, soil improvement will be crucial in future geotechnical practice for designing structures in weak soil. The aim of this study is to investigate the effectiveness of the use of coconut shell ash (CSA) as an additive material to improve the strength of the soft soil. Preliminary tests were carried out on the soft soil sample for identification and classification purposes. Then, engineering tests were carried out such as compaction tests to determine the optimum moisture content (OMC) and maximum dry density (MDD), Un-confined Compression Test (UCT) to assess the unconfined compressive strength of the soft soil when mixed with 0, 5, 10, and 15% of CSA. Finally, this study resume that the coconut shell ash can act as a stabilizer that will lower the cost of treatment and will benefit the environment.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Desiccation Cracking of Kaolin Clay at Laboratory Scale

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Ainie Abdul Shukor, Fauzilah Ismail, Niraku Rosmawati Ahmad, Ahmad Kamil Arshad, Faizah Kamarudin
      Desiccation is the process of extreme drying that results in cracking in materials such as soils. Cracking is a complex process that has the potential to spread and penetrate deeper into the soil, which could lead to instability in earth structures like embankments. A number of desiccation tests were conducted to observe the crack behaviour of manufactured kaolin clay at laboratory scale. All samples were prepared at variation of initial water content and desiccation tests carried out using aluminium desiccation trays. Their crack behaviour was monitored at different thickness and comparison made to the samples tested on different base materials such as ceramic, steel and wood plates. The drying process, crack propagation and pattern were measured and observed daily. A digital image is captured and the crack intensity factor (CIF) calculated manually using a grid system. It was found that a sample of kaolin clay that was 5 mm thick had the highest CIF with rapid propagation and produced non-orthogonal patterns. It also discovered that the thickness of the samples, type of plates utilised and soil state at the start of the test have an impact on the formation and propagation of cracks.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Predicting the Compaction Characteristics for Malaysian Sedimentary

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Norazlan Khalid, Mazidah Mukri, Norbaya Sidek
      This paper presents the regression model for predicting the maximum dry density (MDD) and optimum moisture content (OMC) for sedimentary residual soil mixed with bentonite. The empirical models were developed in accordance with the statistical validity steps and conditions. The laboratories were conducted to determine the physical properties of mixed samples with bentonite such as Atterberg limit and particle size distribution. Meanwhile the compaction testing was performed on the mixed soil samples with bentonite to determine the MDD and OMC values at different compaction energies. The data obtained from laboratories and secondary data were used to develop an empirical model. The results showed there is significant relationship between the particle size, compaction energy and bentonite content to the OMC. Meanwhile there is a relationship between the OMC, bentonite content and compaction energy to the MDD. Reasonably good regression coefficients are obtained in case of both model which R2 = 82% for MDD model and R2 = 72% for OMC model. Meanwhile the determination coefficient and mean square error (MSE) for validated model between predicted model and empirical model were given R2 = 89.5% with MSE = 0.065% for MDD model and R2 = 79.5% with MSE = 5.9% for OMC model. Therefore, the models developed present a good predicting for MDD and OMC values.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • Simulation of Liquefied Natural Gas (LNG) Fluid Flow on Ambient Air

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Mohd Asri Mohd Nor, Muhammad Ammar Imran Mohamad Razki, Nor Fazli Adull Manan
      An ambient air vaporizer (AAV) is an industrial heat exchanger equipment used in the vaporization process of liquefied gases before supplying to consumers. AAV utilizes the simple heat transfer principle that uses surrounding ambient air to vaporize the liquefied gases. Liquefied Natural Gas (LNG) is one of the liquefied gases commonly associated with AAV applications. Due to a significant temperature difference between cryogenic fluid of LNG and ambient air, frost formation is inevitable to reduce the heat transfer rate. Fins geometry contributes a substantial impact on the performance of AAV and is the main element of heat transfer for AAV. This study aims to design a model of an AAV with a star 6-finned tube vaporizer with hexagon shape and to simulate the fluid flow on the vaporizer model to demonstrate the LNG vaporization process. The hexagon vaporizer model is designed using Solidworks, and heat transfer model is simulated using computational fluid dynamics (CFD) tool, Ansys Fluent solver. Parameters such as fin geometry, LNG flowrate and wind speed were referred from previous studies. Methane and air are assumed as working fluids inside and outside of the vaporizer model. Wind temperatures of 300K (27°C), 303K (30°C), and 306K (33°C) are utilized in the simulation process based on geometrical weather in Malaysia. In the simulation model, methane entered from the bottom of the tube, while air entered horizontally at x-direction from the right side. The temperature contour shows that as the temperature of methane that flowed inside the tube increased as it entered the tube, the air temperature reduced as it entered and flowed passes through the finned tube. The analysis from the simulation model shows that higher air temperature with substantial wind speed can increase the outlet temperature of methane (LNG), thus improving the performance of AAV.

      PubDate: Fri, 19 May 2023 00:00:00 +020
  • CFD Performance Analysis of Journal Bearing Using Coconut Oil as Lubricant

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      Abstract: Publication date: 19 May 2023
      Source: Advances in Science and Technology Vol. 127
      Author(s): Ammar bin Ariffin, Khairul Imran Sainan, Syazuan Bin Abdul Latip
      Lubrication is one of the important factors for a journal bearing to function well. Therefore, the use of bio-lubricants such as coconut oil and vegetable oil are highly recommended for their high level of biodegradability to reduce the risk of environmental pollution. Vegetable oil like coconut oil has a great lubricating quality including low friction coefficient and improved oxidation stability which is very suitable to be used as a lubricant. The performance assessment of journal bearings utilizing coconut oil as a bio-lubricant and varying angular velocity and eccentricity ratio will be the main emphasis of this study. The behavior of the journal bearing with coconut oil as the lubricant will be examined using the Computational Fluid Dynamics (CFD) program, ANSYS Fluent. Using ANSYS Fluent, the pressure distribution of pure coconut oil is analytically studied. To evaluate the efficacy of each lubricant with a varied value of angular velocity utilized by the journal in journal bearings, average viscosity, viscosity index, and produced maximum pressure can be discovered under the lubrication of the journal bearing. Using the values of angular velocity with the same value of dynamic viscosity and density as properties for the coconut oil were used to run the simulation for the journal bearing. The result obtained from the simulation for eccentricity ratio of 0.2 with an angular velocity of 5000rpm is 205926.1 meanwhile the result for eccentricity ratio of 0.8 with same angular velocity value is 9661441. Each result signifies those different value of angular velocity with different value of eccentricity ratio that effects the bearing design itself occurs different result.

      PubDate: Fri, 19 May 2023 00:00:00 +020
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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