Subjects -> CHEMISTRY (Total: 928 journals)
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CHEMISTRY (661 journals)            First | 1 2 3 4 | Last

Showing 401 - 600 of 735 Journals sorted alphabetically
Journal of Molecular Liquids     Hybrid Journal   (Followers: 3)
Journal of Molecular Modeling     Hybrid Journal   (Followers: 5)
Journal of Molecular Recognition     Hybrid Journal   (Followers: 2)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Molecular Structure     Hybrid Journal   (Followers: 6)
Journal of Nanoparticles     Open Access   (Followers: 4)
Journal of Nanostructure in Chemistry     Open Access   (Followers: 8)
Journal of Organometallic Chemistry     Hybrid Journal   (Followers: 25)
Journal of Photochemistry and Photobiology     Open Access  
Journal of Photochemistry and Photobiology A: Chemistry     Hybrid Journal   (Followers: 3)
Journal of Photochemistry and Photobiology B: Biology     Hybrid Journal   (Followers: 4)
Journal of Photochemistry and Photobiology C: Photochemistry Reviews     Full-text available via subscription   (Followers: 3)
Journal of Polymer & Composites     Full-text available via subscription   (Followers: 17)
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 7)
Journal of Polymer Science Part A: Polymer Chemistry     Hybrid Journal   (Followers: 92)
Journal of Polymers     Open Access   (Followers: 7)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Progressive Research in Chemistry     Open Access  
Journal of Pure and Applied Chemistry Research     Open Access   (Followers: 3)
Journal of Raman Spectroscopy     Hybrid Journal   (Followers: 14)
Journal of Research and Education Chemistry     Open Access   (Followers: 1)
Journal of Research Updates in Polymer Science     Hybrid Journal   (Followers: 2)
Journal of Rubber Research     Hybrid Journal   (Followers: 1)
Journal of Saudi Chemical Society     Open Access  
Journal of Solid State Chemistry     Hybrid Journal   (Followers: 13)
Journal of Solution Chemistry     Hybrid Journal   (Followers: 1)
Journal of Structural Chemistry     Hybrid Journal   (Followers: 1)
Journal of Sulfur Chemistry     Hybrid Journal   (Followers: 1)
Journal of Supercritical Fluids     Hybrid Journal   (Followers: 3)
Journal of Superhard Materials     Hybrid Journal  
Journal of Surface Science and Technology     Hybrid Journal  
Journal of Surfactants and Detergents     Hybrid Journal   (Followers: 3)
Journal of Taibah University for Science     Open Access  
Journal of the American Chemical Society     Hybrid Journal   (Followers: 323)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 32)
Journal of the American Society of Brewing Chemists     Full-text available via subscription   (Followers: 2)
Journal of the Chilean Chemical Society     Open Access   (Followers: 2)
Journal of the Chinese Chemical Society     Hybrid Journal  
Journal of the Indian Chemical Society     Hybrid Journal  
Journal of The Indonesian Society of Integrated Chemistry     Open Access  
Journal of the Iranian Chemical Society     Hybrid Journal   (Followers: 1)
Journal of the Korean Society for Applied Biological Chemistry     Hybrid Journal  
Journal of the Mexican Chemical Society     Open Access   (Followers: 1)
Journal of the Serbian Chemical Society     Open Access  
Journal of the Turkish Chemical Society, Section A : Chemistry     Open Access  
Journal of Theoretical and Computational Chemistry     Hybrid Journal   (Followers: 9)
Jurnal Inovasi Pendidikan Kimia     Open Access  
Jurnal Kimia (Journal of Chemistry)     Open Access  
Jurnal Kimia Riset     Open Access  
Jurnal Pendidikan Kimia     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kinetics and Catalysis     Hybrid Journal   (Followers: 4)
Konfigurasi : Jurnal Pendidikan Kimia dan Terapan     Open Access  
Korea-Australia Rheology Journal     Hybrid Journal   (Followers: 1)
Langmuir     Hybrid Journal   (Followers: 58)
Lebensmittelchemie     Hybrid Journal   (Followers: 1)
Lipid Insights     Open Access  
Luminescence     Hybrid Journal   (Followers: 2)
Macromolecular Materials & Engineering     Hybrid Journal   (Followers: 5)
Macromolecular Rapid Communications     Hybrid Journal   (Followers: 10)
Macromolecular Research     Hybrid Journal   (Followers: 2)
Macromolecular Symposia     Hybrid Journal   (Followers: 3)
Macromolecular Theory and Simulations     Hybrid Journal   (Followers: 2)
Macromolecules     Hybrid Journal   (Followers: 48)
Magnetic Resonance in Chemistry     Hybrid Journal   (Followers: 8)
Magnetochemistry     Open Access  
Marine Chemistry     Hybrid Journal   (Followers: 6)
Marine Drugs     Open Access   (Followers: 1)
MATEC Web of Conferences     Open Access  
Materials Advances     Open Access   (Followers: 2)
Materials and Devices     Open Access  
Materials Characterization     Hybrid Journal   (Followers: 32)
Materials Chemistry Frontiers     Hybrid Journal   (Followers: 4)
Materials Horizons     Hybrid Journal   (Followers: 6)
Materials Research Bulletin     Hybrid Journal   (Followers: 25)
Materials Science-Poland     Open Access   (Followers: 1)
Materials Sciences and Applications     Open Access   (Followers: 2)
Medicinal Chemistry Research     Hybrid Journal   (Followers: 9)
Mediterranean Journal of Chemistry     Open Access  
Metallography, Microstructure, and Analysis     Hybrid Journal   (Followers: 1)
Micro and Nano Systems Letters     Open Access   (Followers: 6)
Microchimica Acta     Hybrid Journal   (Followers: 2)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 9)
Modern Chemistry & Applications     Open Access   (Followers: 1)
Modern Research in Catalysis     Open Access  
Molbank     Open Access  
Molecular Catalysis     Hybrid Journal   (Followers: 6)
Molecules     Open Access   (Followers: 4)
Molecules and Cells     Hybrid Journal   (Followers: 1)
Monatshefte für Chemie - Chemical Monthly     Hybrid Journal   (Followers: 4)
Mongolian Journal of Chemistry     Open Access  
Moscow University Chemistry Bulletin     Hybrid Journal   (Followers: 1)
MRS Bulletin     Full-text available via subscription   (Followers: 4)
Nachrichten aus der Chemie     Hybrid Journal   (Followers: 18)
Nano Convergence     Open Access   (Followers: 1)
Nano Materials Science     Open Access   (Followers: 1)
Nano Reviews & Experiments     Open Access   (Followers: 14)
Nano Select     Open Access  
Nanochemistry Research     Open Access   (Followers: 1)
Nanoscale     Hybrid Journal   (Followers: 18)
Nanoscale Advances     Open Access  
Nanoscale Horizons     Hybrid Journal  
Nanoscale Research Letters     Open Access   (Followers: 8)
Nanoscience and Nanotechnology Letters     Full-text available via subscription   (Followers: 24)
Natural Product Communications     Open Access  
Natural Product Reports     Hybrid Journal   (Followers: 10)
Natural Science     Open Access   (Followers: 8)
Natural Volatiles & Essential Oils     Open Access  
Nature Chemistry     Full-text available via subscription   (Followers: 97)
Nature Protocols     Full-text available via subscription   (Followers: 72)
Nature Reviews Chemistry     Hybrid Journal   (Followers: 17)
New Journal of Chemistry     Hybrid Journal   (Followers: 17)
Nitric Oxide     Hybrid Journal  
Nitrogen     Open Access  
Nukleonika     Open Access  
Open Chemistry Journal     Open Access  
Open Conference Proceedings Journal     Open Access  
Open Journal of Chemistry     Open Access  
Open Journal of Composite Materials     Open Access   (Followers: 22)
Open Journal of Inorganic Non-metallic Materials     Open Access   (Followers: 2)
Open Journal of Medicinal Chemistry     Open Access   (Followers: 4)
Open Journal of Polymer Chemistry     Open Access   (Followers: 12)
Open Journal of Synthesis Theory and Applications     Open Access  
Open Medicinal Chemistry Journal     Open Access  
Orbital - The Electronic Journal of Chemistry     Open Access   (Followers: 1)
Organic & Biomolecular Chemistry     Hybrid Journal   (Followers: 57)
Organometallics     Hybrid Journal   (Followers: 19)
Oxidation of Metals     Hybrid Journal   (Followers: 16)
Passer Journal of Basic and Applied Sciences     Open Access  
Peptide Science     Full-text available via subscription  
Pharmaceuticals     Open Access   (Followers: 4)
Pharmaceutics     Open Access   (Followers: 5)
Phosphorus, Sulfur, and Silicon and the Related Elements     Hybrid Journal   (Followers: 2)
Photochemistry and Photobiology     Hybrid Journal   (Followers: 3)
Physical Science International Journal     Open Access  
Physics and Materials Chemistry     Open Access   (Followers: 1)
Phytochemistry     Hybrid Journal   (Followers: 4)
Phytochemistry Letters     Full-text available via subscription   (Followers: 1)
Plasma     Open Access   (Followers: 3)
Plasma Chemistry and Plasma Processing     Hybrid Journal   (Followers: 3)
Polycyclic Aromatic Compounds     Hybrid Journal  
Polyhedron     Hybrid Journal   (Followers: 4)
Polymer Chemistry     Hybrid Journal   (Followers: 24)
Polymer crystallization     Hybrid Journal  
Polymer Degradation and Stability     Hybrid Journal   (Followers: 23)
Polymer Engineering & Science     Hybrid Journal   (Followers: 14)
Polymer Reviews     Hybrid Journal   (Followers: 32)
Polymer Science Series D     Hybrid Journal   (Followers: 3)
Polymer Testing     Hybrid Journal   (Followers: 193)
Polymer-Plastics Technology and Materials     Hybrid Journal   (Followers: 5)
Polymers     Open Access   (Followers: 21)
Polymers from Renewable Resources     Hybrid Journal  
Proceedings of the Combustion Institute     Full-text available via subscription   (Followers: 8)
Processes     Open Access  
Progress in Lipid Research     Hybrid Journal   (Followers: 3)
Progress in Organic Coatings     Hybrid Journal   (Followers: 7)
Progress in Polymer Science     Full-text available via subscription   (Followers: 36)
Progress in Reaction Kinetics and Mechanism     Open Access  
Progress in Solid State Chemistry     Full-text available via subscription   (Followers: 3)
Progress in Surface Science     Full-text available via subscription   (Followers: 3)
Protein Science     Hybrid Journal   (Followers: 45)
Radiochemistry     Hybrid Journal   (Followers: 1)
Rapid Communications in Mass Spectrometry     Hybrid Journal   (Followers: 33)
Reaction Chemistry & Engineering     Hybrid Journal  
Reaction Kinetics, Mechanisms and Catalysis     Hybrid Journal   (Followers: 3)
Reactions     Open Access  
Reportes Científicos de la FaCEN     Open Access  
Research Journal of Phytochemistry     Open Access   (Followers: 1)
Resources Chemicals and Materials     Full-text available via subscription   (Followers: 2)
Results in Chemistry     Open Access  
Results in Geochemistry     Open Access  
Results in Surfaces and Interfaces     Open Access  
Review Journal of Chemistry     Hybrid Journal   (Followers: 1)
Reviews in Mineralogy and Geochemistry     Hybrid Journal   (Followers: 4)
Revista Boliviana de Química     Open Access  
Revista CENIC. Ciencias Quimicas     Open Access  
Revista Colombiana de Ciencias Químico-Farmacéuticas     Open Access  
Revista Colombiana de Química     Open Access  
Revista Cubana de Química     Open Access  
Revista de Ciencia y Tecnología     Open Access  
Revista de Ciencias     Open Access  
Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales     Open Access  
Revista de la Sociedad Química del Perú     Open Access  
Revista de la Societat Catalana de Química     Open Access  
Revista de Química     Open Access   (Followers: 3)
Revista Debates em Ensino de Química     Open Access  
Revista ION     Open Access  
RSC Advances     Open Access   (Followers: 27)
RSC Chemical Biology     Open Access  
RSC Medicinal Chemistry     Hybrid Journal   (Followers: 6)
Russian Journal of Bioorganic Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of Coordination Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of General Chemistry     Hybrid Journal   (Followers: 1)
Russian Journal of Inorganic Chemistry     Hybrid Journal  
Sainstek : Jurnal Sains dan Teknologi     Open Access  
Science China Chemistry     Hybrid Journal   (Followers: 2)
Science Talks     Full-text available via subscription   (Followers: 2)
Sciences & Technologie A : sciences exactes     Open Access  
Scientific Journal of Frontier Chemical Development     Open Access   (Followers: 2)

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Materials Science-Poland
Journal Prestige (SJR): 0.275
Citation Impact (citeScore): 1
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2083-1331 - ISSN (Online) 2083-134X
Published by Sciendo Homepage  [370 journals]
  • Physico-mechanical properties, structure, and phase composition of (BeO +
           TiO)-ceramics containing TiO nanoparticles (0.1–2.0 wt.%)

    • Abstract: This research studies the effects of addition of micro- and nanoparticles of TiO2 and variations in the firing temperature on the physico-mechanical properties of oxide-beryllium ceramics, shows the evolution of the microstructure of such ceramics during sintering, and presents the data of X-ray phase analysis. It was shown that the addition of TiO2 nanoparticles leads to a higher density of the ceramic material after sintering due to the interpenetration of TiO2 and BeO phases, which is caused by an increase in the diffusion mobility of atoms that can in turn be attributed to an increase in the imperfection of the structure and the fraction of grain boundaries. It was found that the presence of nanoparticles contributes to an increase in the apparent density of the material, as well as a decrease in its total and closed porosity; and an increase in the sintering temperature contributes to the transformation of the crystalline structure of TiO2 into a more conductive Ti3O5with an orthorhombic structure. The presence of nanoparticles also promotes self-healing of micropores, which can be explained by the blocking of a certain fraction of the interfaces between BeO particles by nanoparticles and the creation of a diffusion barrier.
      PubDate: Mon, 16 May 2022 00:00:00 GMT
       
  • The preparation of CNT/PMMA composite film on SiO substrates

    • Abstract: Microelectromechanical system (MEMS) has been highly valued since the size of the MEMS structure is miniaturized, the spacing between the components is in the nanometer range, and the behaviors of friction and adhesion greatly affect the reliability of MEMS. An atomic force microscope (AFM) was used to observe the surface morphology of carbon nanotube (CNT)/polymethyl methacrylate (PMMA) film, and X-ray photoelectron spectroscopy (XPS) was used to analyze the chemical state of typical elements on the surface of the film. The friction and wear properties of composite nano-films under macroscopic conditions were systematically studied. The research results show that the composite nano-film has excellent anti-friction and anti-wear properties.
      PubDate: Mon, 16 May 2022 00:00:00 GMT
       
  • Decomposition mechanisms of continuously cooled bainitic rail in the
           critical heat-affected zone of a flash-butt welded joints

    • Abstract: The joining process of bainitic rails is significant in terms of their industrialization in high-speed and heavy-loaded railways. This paper demonstrates the microstructure changes in the critical zone of the welded joint, which is responsible for the greatest deterioration in mechanical properties. Extensive progress in the decomposition of the retained austenite and bainitic ferrite occurs in the low-temperature heat-affected zone (LTHAZ) of the flash-butt welded joint of low-carbon bainitic rail. The decomposition products of the retained austenite were mainly a mixture of cementite and ferrite. The cementite was mainly precipitated at the boundary of the bainitic ferrite laths, which indicates lower thermal stability of the filmy austenite. Moreover, it was found that a part of the refined blocky retained austenite was decomposed into the ferrite and nanometric cementite, while another remained in the structure. The decomposition mechanisms are rather heterogeneous with varying degrees of decomposition. A relatively high proportion of dislocations and stress fields prove the occurrence of residual stresses formed during the welding process.
      PubDate: Tue, 10 May 2022 00:00:00 GMT
       
  • AlO-TiO coatings deposition by intermixed and double injection SPS
           concepts

    • Abstract: This work focuses on the study on the novel hybrid method of simultaneous spraying from two different materials (Al2O3 and TiO2) by means of suspension plasma spraying (SPS) using submicron powder and water suspension. The goal was to attempt the deposition of intermixed alumina-titania coatings, namely: Al2O3 + 3 wt.% TiO2, Al2O3 + 13 wt.% TiO2, and Al2O3 + 40 wt.% TiO2. Such compositions are already used but in the form of conventionally plasma sprayed coatings, with micrometer-sized powder. Meanwhile, the injection of feedstocks with submicron-sized particles has not been established yet. In particular, this paper uses two routes of feedstock injection, (i) with the use of an intermixed suspension and (ii) a double injection of separate suspensions. The attention was paid to the characterization of the feedstock materials, description of deposition parameters as well as the morphology, microstructure, and phase composition of the obtained coatings. Among all coatings, Al2O3 + 40 wt.% TiO2 sprayed with double injection contained the most homogeneously distributed and melted splats. The results from this work demonstrate the possibility of coating deposition both by intermixed and double injection concepts but also the need for the further application-relevant optimization, related to the presence of intercolumnar gaps in the microstructure of the coatings.
      PubDate: Fri, 29 Apr 2022 00:00:00 GMT
       
  • Delayed setting time for alkali-activated slag composites using activator
           containing SiO and NaO

    • Abstract: This study examines the influence of SiO2 and Na2O mix proportions on the properties of alkali-activated slag (AAS) pastes. In order to solve the rapid setting problem associated with AAS, phosphoric or silicic acid is commonly added to the alkaline activator. The retarding effect of these additions suggests a close relationship between pH and setting time. In this study, AAS pastes with various SiO2 and Na2O dosages were analyzed. Regression analysis was carried out using pH value and setting time to identify the main parameters affecting the setting time. Results showed that the alkali modulus (i.e., the weight ratio of SiO2 over Na2O) is correlated with the pH value. Specifically, the initial and final setting times were significantly reduced under lower SiO2 and Na2O dosages. Therefore, a higher alkali modulus prolonged the setting time.
      PubDate: Tue, 26 Apr 2022 00:00:00 GMT
       
  • Optimisation of fragrance finishing on cotton by grafting of -cyclodextrin
           based microcapsules: Application of the experimental design methodology

    • Abstract: The grafting reaction of β-cyclodextrin-based microcapsules containing neroline onto pure cotton jersey knitted fabric is studied. The influence of the concentrations of microcapsules, citric acid (CA) crosslinking agent and catalyst on the fabric mass gain was studied to determine the optimum operating conditions. For this purpose, an experimental design based on response surface methodology (RSM) was used leading to the development of a predictive statistical model. The optimal grafting conditions were thus determined: 107.6 g ⋅ L−1 for microcapsules concentration, 111.9 g ⋅ L−1 for CA concentration and 50 g ⋅ L−1 for disodium hydrogen phosphate (DHP) catalyst concentration (CAT). Morphology, tensile properties, air permeability and washing fastness of finished textile were studied to evaluate the effectiveness of the optimised grafting process.
      PubDate: Mon, 25 Apr 2022 00:00:00 GMT
       
  • Influence of spray distance on mechanical and tribological properties of
           HVOF sprayed WC-Co-Cr coatings

    • Abstract: In this work, the tungsten carbide reinforcement in cobalt matrix (WC-Co-Cr) coatings was studied. The deposition process was carried out by high-velocity oxy-fuel spraying (HVOF). The study aimed to investigate the influence of one of the key process parameters, namely spray distance, on the coatings’ microstructure and phase composition, as well as their mechanical and tribological properties. The manufactured coatings were analysed by scanning electron microscopy, X-ray diffraction (XRD), instrumented indentation test, pull-off adhesion test and ball-on-disc method. The results revealed that selection of proper spray distance caused a high index of carbide retention (ICR) amounting to 0.95, which promoted higher hardness and better wear resistance. Instrumental microhardness was in the range of 14.2–14.8 GPa, whereas the Young modulus exhibited values from 336 GPa up to 342 GPa. The bond strength of deposited coatings was in the range of 55–65 MPa. Wear factor values were in the range of 73–81 × 10−7 mm3/(N · m) and the friction coefficient was about 0.4. The dominant wear mechanism is abrasion and adhesive mode supported by the fatigue-induced material delamination.
      PubDate: Thu, 21 Apr 2022 00:00:00 GMT
       
  • Effect of sea sand and recycled aggregate replacement on fly
           ash/slag-based geopolymer concrete

    • Abstract: The purpose of this study is to investigate the impact of recycled aggregate (RA) and sea sand (SS) replacement on fly ash (FA) slag-based geopolymer concrete (GPC). An orthogonal array design is employed to obtain the optimum mix proportions, and geopolymer mixes are prepared using slag percentages of 10%, 20%, and 30% slag in FA/slag-based GPC. Sodium hydroxide (NaOH) solution is prepared at three concentrations (8 mol/L, 12 mol/L, and 16 mol/L). The mechanical properties of the geopolymer mixes are determined based on the tensile strength, compressive strength, flexural strength, and elastic modulus. GPC is prepared using water-binder ratios of 0.3, 0.4, and 0.5 at 0%, 25%, 50%, 75%, and 100% of RA replacement. The results showed that the variation in the RA replacement ratio had little effect on the strength and elastic modulus of sea sand geopolymer concrete (SS–GPC), but it had a significant effect on river sand geopolymer concrete (RS–GPC). The RA replacement ratio also showed a noticeable change in the damage surface of the specimens. In addition, SS hinders the hydration reaction of the geopolymer in the early stage and reduces the early strength of the GPC; however, in the later stages, the effect becomes insignificant.
      PubDate: Wed, 20 Apr 2022 00:00:00 GMT
       
  • The influence of MXenes on the mechanical, antistatic, and heat-resistant
           properties of CF/PI composites

    • Abstract: Carbon fiber (CF) and MXene were filled in polyimide (PI) to prepare the CF/MXene/PI composite by compression molding. High-resistance meter, thermal conductivity tester, and scanning electron microscope were used to study the antistatic performance, thermal performance, and mechanical performance of the CF/MXene/PI composite, and the effect of heat treatment on the composite’s mechanical properties is discussed. The results show that when the mass fractions of CF and MXene increase, the tensile strength and impact strength of CF/PI and CF/MXene/PI composites all show a trend of first increasing and then decreasing. And when the mass fractions of CF and MXene are 15% and 3%, respectively, the performance of the CF/MXene/PI composite is better. The thermal conductivity of the CF/MXene/PI composite shows an increase with increase in the mass fraction of MXene. Heat treatment affects the mechanical properties of the CF/MXene/PI composite. When the treatment temperature is >240°C, the tensile strength and impact strength of the composite do not change much.
      PubDate: Mon, 04 Apr 2022 00:00:00 GMT
       
  • Multiobjective optimization of fluphenazine nanocomposite formulation
           using NSGA-II method

    • Abstract: The World Health Organization (WHO, 2019) reports that schizophrenia affects approximately 20 million people worldwide, and the annual number of new cases is estimated at 1.5%/10,000 people. As a result, there is a demand for making the relevant medicines work better. Using a fluphenazine (FZN) drug delivery system that has been optimized using nanoparticles (NPs) technology is an important alternative treatment option for noncompliant patients with schizophrenia. Compared to the conventional delivery system, the NPs delivery system provides a controlled-release treatment, minimizes drug levels reaching the blood, and has fewer side effects as well. As a result of using the NPs delivery system, patients can obtain the benefits of reduced daily dosing and improved compliance. In this context, this study was performed to develop a mathematical model for FZN to optimize its nanocomposite delivery system using a mixture-process DoE and multiobjective optimization (MOO) approaches. The influences of NPs input fabrication parameters [i.e., FZN percentage, chitosan (CS) percentage, sodium tripolyphosphate (TPP) percentage, and pH] were investigated by mixture-designed experiments and analyzed by analysis of variance (ANOVA); subsequently, based on the results of the analysis, three regression models were built for size, zeta potential (ZP), and drug loading efficiency (LE%); and thereafter, these models were validated using 26 experiments with three replicates. The MOO approach was employed using a non-dominated sorting genetic algorithm (NSGA-II) to provide the optimal fitness value of each objective function by minimizing NPs size, maximizing ZP, and maximizing LE%. Test of hypotheses showed no statistical differences between the average observed values and the corresponding predicted values calculated by the regression models (126.6 nm, 18.7 mV, and 91.6%, respectively). As there is no benchmark available for the optimal NPs input fabrication parameters in the literature, the optimized formulation was further characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), polydispersity index (PdI), and differential scanning calorimetry (DSC). Those tests indicated that FZN was successfully encapsulated into the final nanocomposite. Furthermore, an in-vitro drug release study was carried out and showed that at least 5 days would be needed for FZN to be fully released from its nanocomposite in a sustained-release pattern. The nanocomposite could serve as a model for the controlled and extended delivery of many drugs.
      PubDate: Sun, 27 Mar 2022 00:00:00 GMT
       
  • Experimental and theoretical behavior of cementitious plates containing
           ethylene vinyl acetate reinforced with glass woven fabric under impact
           load

    • Abstract: The paper is an analysis of the experimental and theoretical behavior of cementitious plate containing waste ethylene vinyl acetate (EVA) with and without reinforcement with glass fiber woven fabric (GFRP) under low-velocity impact load effect. Cementitious plates of 150 mm × 150 mm size and three different thicknesses (15 mm, 30 mm, 50 mm) are produced by replacing the cement mixture aggregate with EVA at 0%, 18%, 32%, 45%, and 56% by volume of aggregate. Then, the cementitious plates are coated with GFRP using vacuum infusion method. The effect of EVA and GRFP coatings on the dynamic impact behavior of cementitious plates is investigated by applying a low-velocity impact test on the produced cementitious plates with an impactor of 18 mm diameter, 10.50 kg weight, and 500 mm height. The data obtained from the experimental results are analyzed based on the mass-plate theory, lightweight (LWC) and normal weight (NWC) concrete, and the consistency of the theoretical results with the experimental results is compared. It has been determined that the use of NWC is more suitable for cementitious plates with an EVA replacement rate in the range of 0–32%, while the use of LWC offers more optimum results if the EVA ratio is in the range of 32–56%. Especially when the EVA displacement exceeds 32%, it causes excessive void formation in the structure, resulting in a reduction in the dynamic impact loads of cementitious plates. GFRP coating with vacuum infusion method is not recommended for cementitious plate structures when the EVA replacement rate exceeds 32% by volume of aggregate.
      PubDate: Mon, 07 Mar 2022 00:00:00 GMT
       
  • Confinement effectiveness of CFRP strengthened ultra-high performance
           concrete cylinders exposed to elevated temperatures

    • Abstract: Fire-related damage is an alarming concern to reinforced concrete (RC) structures throughout their service lives. When exposed to extreme temperatures, concrete can endure severe damage. Given that a complete replacement and/or demolition of fire-damaged structures can be an economic waste, a more viable option for extending the service life of the damaged structures involves repairing or strengthening the damaged members. Due to its more efficient qualities over conventional concrete, the use of concrete, such as ultra-high-performance concrete (UHPC) in the building industry, has dramatically grown in recent years. However, limited information is available about the confinement behavior of the unheated and heated UHPC members, particularly when wrapped with fiber-reinforced polymers (FRP). This paper investigates the effect of carbon fiber reinforced polymer (CFRP) sheet strengthening on the compressive strength of both UHPC and ultra-high-performance fiber reinforced concrete (UHPFRC). In this study, strengthening has been considered for the UHPC cylinders before and after they were subject to an elevated temperature of 400°C, and they were left to cool by air cooling. Six UHPC mixes, which were made without the use of fibers, steel fibers (SF) alone, a hybrid system of SF and polyethylene alcohol (PVA), in addition to a hybrid system of steel, PVA, and polypropylene (PP) fibers were tested. Regarding the plain and various fiber-reinforced UHPC both at room temperature and after being exposed to 400°C, the ultimate compressive strength of CFRP-confined concrete has shown an increase by 25% to 33% and 52% to 61%, respectively compared with the unheated specimens.
      PubDate: Wed, 23 Feb 2022 00:00:00 GMT
       
  • Triple-layer remote phosphor structure: A potential packaging
           configuration to enhance both color quality and lumen efficiency of
           6,000–8,500 K WLEDs

    • Abstract: To achieve further enhancement in the lighting quality of white light-emitting diodes (WLEDs), this study proposed a packaging structure with three different phosphor layers, called triple-layer remote phosphor structure. This structure can provide an overall control over the light color distribution of WLEDs. The yellow-green-emitting CaAl2O4:Mn2+ phosphor and red-emitting CaMoO4:Eu3+ phosphor are used along with the original yellow-emitting YAG:Ce3+ phosphor to fabricate the triple-layer structure. The concentration of yellow-emitting YAG:Ce3+ phosphor is required to be decreased as the concentrations of other phosphors increase to keep the predetermined correlated color temperatures. The color rendering index (CRI) and the color quality scale (CQS) are measured to reach a thorough color quality assessment for WLEDs. The color management can be achieved by adjusting the concentration of red-emitting CaMoO4:Eu3+ phosphor to enhance the red emission. In addition, adjustment of the concentration of yellow-green-emitting CaAl2O4:Mn2+ phosphor can result in higher luminous efficiency owing to its control over the green light components. Higher CRI is observed when CaMoO4:Eu3+ concentration increases, while an increase in CaAl2O4:Mn2+ phosphor leads to much lower CRI. The CQS – on the other hand – is remarkably high when the CaMoO4:Eu3+ concentration range is about 10wt%–14wt%, regardless of the proportion of the CaAl2O4:Mn2+ phosphor. Furthermore, 40% enhancement in luminous efficiency is also achieved since light scattering is minimized by the boosted green-light emission spectra. Manufacturers can take these findings as reference to fabricate high-quality WLED lights that fulfill all their requirements.
      PubDate: Tue, 08 Feb 2022 00:00:00 GMT
       
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
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