jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Prashant D. Yeram
Source: African Journal of Biomedical Research (review, 2024-09-29)
Field: Materials Science — Polymers and Plastics

Synthesis And Characterization Of Chitosan-Based Polypyrrole, Polyaniline, Polystyrene And Its Optical And Physical Properties: A Review Research in polymers and composites particularly those that are based on chitosan has become a novel and encouraging prospect in the field. This article provides a review on factors such as synthesis, characterization of composites based on chitosan and polypyrrole (PPy), polyaniline (PANI) and polystyrene (PS). This review paper discusses in detail the various types of synthesis methods like chemical polymerization, electrochemical deposition, in-situ polymerization and their underlying principles as well as their composites. Methods of characterizations such as Fourier Transform- Infrared Spectroscopy (FT-IR), Ultraviolet-Visible Spectroscopy (UV-Vis), X-ray Diffraction (XRD), Scanning (SEM) and Transmission Electron Microscopy (TEM) are reviewed in order to explain the structural, morphological and optical features of the composites. The review goes on to discuss depressively how the factors underly the physical characteristics of these materials. Also, the paper presented and analyses progress in enhancing the properties of these composite materials for a various applications. As well the paper pointed out the drawbacks that have risen during the fabrication and utilization of these composites and looked into the viewpoint of the current developments in this area. Through a comprehensive analysis of recent research articles and reviews, this paper aims to provide researchers, engineers and materials scientists with a thorough understanding of chitosan-based PPy, PANI, and PS composites, their properties and potential applications. Polypyrrole ; Polyaniline ; Characterization (materials science) ; Polystyrene ; Materials science ; Chitosan ; Chemical engineering ; Polymer chemistry ; Nanotechnology ; Polymer ; Composite material ; Polymerization ; Engineering Conducting polymers and applications
Authors: Anuja Kumari | Raman, D. K. | Santanu K. Maiti | Biswas, Raju K. | Nag, Abhinav | Maiti, Santanu K. | Kumar, Jagdish
Source: arXiv (Cornell University) (preprint, 2024-01-03)
Field: Materials Science — Materials Chemistry

Enhanced thermoelectric properties of two-dimensional Janus ferromagnetic LaBrI with strain-induced valley degeneracy Since the successful synthesis of the MoSSe monolayer, which violated the out-of-plane mirror symmetry of TMDs monolayers, considerable and systematic research has been conducted on Janus monolayer materials. By systematically analyzing the LaBrI monolayer, we are able to learn more about the novel Janus material by focusing on the halogen family next to group VIA (S, Se, Te). The structural optimizations have been carried out using pseudopotential based Quantum espresso code. Computed structural parameters are in good agreement with literature reports. The optimized crystal structures were used for computing effect of strain on electronic and thermoelectric properties. Dynamical stability predicts that this material can withstand up to 10% of tensile strain. Computed electronic structure reveals material to be indirect wide band gap ferromagnet with magnetic moment 1μB. With increase in the biaxial tensile strain the band gap decreases. Furthermore, the computed magneto-thermoelectric properties predict high Seebeck coefficient ~ 400 μV/K and low thermal conductivity of ~ 0.93 W/m.K in LaBrI which results in a high ZT ~ 1.84 for 4% strain at 800 K. The present study supports the fact that tensile strain on ferromagnetic LaBrI material can further enhance TE properties making it to be a promising material for TE applications at higher temperatures. Condensed matter physics ; Materials science ; Thermoelectric effect ; Ferromagnetism ; Monolayer ; Thermoelectric materials ; Magnetic moment ; Band gap ; Seebeck coefficient ; Janus ; Thermal conductivity ; Nanotechnology ; Optoelectronics ; Composite material ; Physics ; Thermodynamics Advanced Thermoelectric Materials and Devices ; 2D Materials and Applications ; Heusler alloys: electronic and magnetic properties
Authors: Oliwia Paroń
Source: Engineering Sciences And Technologies (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Fotokataliza i materiały kompozytowe TiO2/SiO2 w oczyszczaniu środowiska Cel: Celem artykułu jest omówienie znaczenia fotokatalizy oraz roli materiałów kompozytowych TiO₂/SiO₂ jako innowacyjnej metody oczyszczania środowiska, ze szczególnym uwzględnieniem eliminacji zanieczyszczeń wód i powietrza. Przedstawiono również konieczność poszukiwania skuteczniejszych rozwiązań w związku z ograniczeniami konwencjonalnych metod oczyszczania. Metodyka: Analiza opiera się na przeglądzie literatury dotyczącej fotokatalizy oraz właściwości tlenku tytanu (IV) i jego kompozytów z krzemionką. Szczególną uwagę poświęcono mechanizmom działania TiO₂, jego ograniczeniom oraz sposobom ich przezwyciężania przez modyfikacje strukturalne i chemiczne. Wyniki: Wykazano, że TiO₂, mimo swojej wysokiej skuteczności jako fotokatalizator, wykazuje pewne ograniczenia, takie jak niska aktywność w zakresie światła widzialnego oraz podatność na rekombinację nośników ładunku. Połączenie TiO₂ z SiO₂ prowadzi do poprawy właściwości katalitycznych, zwiększając efektywność procesu oczyszczania środowiska. Implikacje i rekomendacje: Zastosowanie kompozytów TiO₂/SiO₂ stanowi obiecującą alternatywę dla konwencjonalnych metod oczyszczania wód i powietrza. W przyszłości wskazane jest dalsze badanie tych materiałów, zwłaszcza pod kątem ich efektywności w warunkach rzeczywistych oraz możliwości zastosowania w praktycznych technologiach środowiskowych. Oryginalność/wartość: Artykuł podkreśla znaczenie innowacyjnych rozwiązań w dziedzinie fotokatalizy, ze szczególnym naciskiem na wykorzystanie materiałów kompozytowych TiO₂/SiO₂. Prezentowane podejście wskazuje na potencjał tych materiałów w walce z zanieczyszczeniem środowiska oraz ich przewagę nad konwencjonalnymi metodami oczyszczania. Environmental science Catalytic Processes in Materials Science ; Material Science and Thermodynamics
Authors: Md. Shaharul Islam | Md. Samiul Bari Avick | Jahangir Hossain | Md. Shamsul Alam | Md. Helal Uddin
Source: Chemical Science International Journal (article, 2024-11-19)
Field: Materials Science — Materials Chemistry

Impact of Additives and ZnO Nanoparticles on the Sonodegradation of Methylene Blue Sonohemical method for the degradation of toxic dyestuffs is now considered as a promising technique. An important dye namely Methylene Blue (MB) was degraded using ultrasound irradiation at different pH. The impact of various additives like CCl4, H2O2, NaCl and Na2SO4 with different doses for MB degradation was observed. The degradation efficiency of ZnO nanoparticles was also measured. The sonolysis was conducted for 0, 5, 15, 25 minutes and the extent of degradation was measured by UV–vis spectrophotometer. Acidic media was more efficient for degradation compared to basic media. 200 µM/L doses H2O2 of 20 mM concentration showed highest efficiency (41.98%) to degrade the MB molecules. On the other hand CCl4, Na2SO4 and ZnO nanoparticles also showed maximum 35.63%, 34.88% and 41.72% degradation efficiency respectively. The efficiency increases in the presence of additives and ZnO nanoparticles in comparison to the efficiency (18.88%) obtained without these additives. Methylene blue ; Nanoparticle ; Methylene ; Nanotechnology ; Materials science ; Chemistry ; Chemical engineering ; Nuclear chemistry ; Organic chemistry ; Engineering ; Catalysis ; Photocatalysis Ultrasound and Cavitation Phenomena
Authors: Lukas Niklaus | Marco Schott
Source: NATO Journal of Science and Technology (article, 2024-01-22)
Field: Materials Science — Polymers and Plastics

Flexible Electrochromic Elements for Adaptive Camouflage Optical camouflage alone is no longer sufficient, due to the development of sensor-based signal and signature recognition, which can detect different wavelengths of the electromagnetic spectrum (visible [VIS, 380 – 780 nm], near-infrared [NIR, 780 – 2500 nm], thermal infrared [TIR, 8 – 12.5 μm] or radar [2.4 – 3.75 cm]). A modern, high-performance camouflage element should provide protection over the widest possible range of the electromagnetic spectrum and would therefore be called a multispectral camouflage system. This tunability in the VIS and NIR is possible with electrochromic (EC) materials. By applying an electric voltage or current, a colour change of the EC materials is induced, which actively controls the absorption, transmission, and reflection of surfaces and creates an adjustable camouflage pattern. Camouflage ; Multispectral image ; Electrochromism ; Reflection (computer programming) ; Electromagnetic radiation ; Electromagnetic spectrum ; Infrared Transition Metal Oxide Nanomaterials ; Pigment Synthesis and Properties ; Thermal Radiation and Cooling Technologies
Authors: Hakan Ozbay
Source: Technobius physics. (article, 2024-12-23)
Field: Chemistry — Organic Chemistry

Effect of ethanol on the structure and aggregation properties of C₆₀ fullerenes This study investigated the effect of ethanol on the structure and aggregation properties of C₆₀ fullerenes using an atomic force microscope. The fullerenes were dissolved in ethanol with different concentrations (0%, 10%, 25%, 50%, 100%) and deposited on silicon substrate for further analysis. The results showed that the size of molecular aggregates of fullerenes increased significantly with increasing ethanol concentration, starting from 15-20 nm in the absence of ethanol and reaching 80-100 nm at 100% ethanol. At the same time, the structure of the aggregates became more friable, indicating the solvent effect of ethanol. The interaction force measurements showed that the adhesion force of fullerenes to the substrate decreased with increasing ethanol concentration, indicating a weakening of adhesion and molecular interactions. These data confirm the significant effect of ethanol on the physicochemical properties of fullerenes and can be used to develop nanomaterials with variable structural characteristics. Fullerene ; Ethanol ; Nanomaterials ; Substrate (aquarium) ; Solvent ; Chemistry ; Chemical engineering ; Silicon ; Adhesion ; Nanotechnology ; Materials science ; Organic chemistry Fullerene Chemistry and Applications ; Carbon Nanotubes in Composites ; Laser-Ablation Synthesis of Nanoparticles
Authors: T.L. Berlin Beno | M. Lenin | R.S. Abina Shiny
Source: Current Science (article, 2024-10-25)
Field: Chemistry — Spectroscopy

Analysing the synthesis and characterization of semi-organic compound tartaric acid ammonium chloride by slow evaporation method Tartaric acid ; Ammonium chloride ; Characterization (materials science) ; Evaporation ; Ammonium ; Chloride ; Chemistry ; Organic compound ; Nuclear chemistry ; Inorganic chemistry ; Organic chemistry ; Materials science ; Nanotechnology ; Geography Analytical Chemistry and Chromatography
Authors: Vadym Кovalenko | Anastasiia Borysenko | Valerii Kotok | Volodymyr Verbitskiy | Volodymyr Medianyk | Вікторія Столяренко | Yuriy Pepa | S. V. Simchenko | Viktor Ved | Sheikh Ahmad Izaddin Sheikh Mohd Ghazali
Source: Eastern-European Journal of Enterprise Technologies (article, 2024-04-30)
Field: Materials Science — Polymers and Plastics

Determination of the possibility of the synthesis of Zn-Al layered double hydroxides, intercalated with peroxyanions, as a perspective solid disinfectant Infectious diseases in the modern world pose a significant threat to humanity in the form of epidemics and pandemics. To prevent and combat them, it is necessary to carry out antiseptic and disinfectant treatments of various environments, household and industrial surfaces, as well as wounds of various origins. Double-layer hydroxides intercalated with peroxyanions as active oxygen compounds are promising materials for this. In order to determine the possibility of obtaining Zn-Al double-layer hydroxide intercalated with peroxylactic acid anions, samples were synthesized by the method of chemical co-precipitation in the presence of peroxylactic acid at controlled pH (8, 10) and t=20 ℃. The properties of the synthesized samples were investigated. The content of active oxygen (in terms of H2O2) was determined by the method of iodometric titration with the calculation of the percentage of hydrogen peroxide that was intercalated in double layered hydroxides, remained in the mother solution or was lost. The crystal structure was studied by X-ray phase analysis, the yield of samples was determined gravimetrically, and sedimentation was determined by measuring and normalizing the thickness of the sediment layer. It was found that the samples synthesized at pH=8 and 10 are biphasic and consist of an oxide phase and a double-layer hydroxide phase. The determined content of active oxygen (in terms of H2O2) in the samples synthesized at pH=8 (0.533 %) and at pH=10 (0.876 %) confirms the success of the synthesis of Zn-Al-peroxylactate double layered hydroxides. Synthesis at elevated pH is promising. A low percentage of H2O2 intercalation was revealed – 4.03–6.54 %, the majority of hydrogen peroxide (82.36-94.44 %) remains in the mother solution. The yield of the synthesized samples was determined to be 61.9 % and 79.5 % at synthesis pH of 10 and 8, respectively. The sedimentation properties of the samples were studied and their improvement was shown when the pH of the synthesis was increased Layered double hydroxides ; Hydroxide ; Titration ; Chemistry ; Inorganic chemistry ; Oxide ; Iodometry ; Hydrogen peroxide ; Nuclear chemistry ; Organic chemistry Polymer Synthesis and Characterization ; Magnesium Oxide Properties and Applications ; Antimicrobial agents and applications
Authors: Deepak Kumawat | Harshal Tare
Source: International Journal of Pharmaceutical Quality Assurance (article, 2024-03-25)
Field: Chemistry — Organic Chemistry

Benzimidazoles in Medicinal Chemistry: Current Trends and Future Opportunities Because of their various pharmacological actions and structural plasticity, benzimidazoles, a class of heterocyclic molecules, have received much attention in medicinal chemistry. This review paper aims to provide a complete overview of the current developments and future possibilities of benzimidazoles as promising candidates for the creation of innovative therapeutic medicines. The introduction discusses the importance of benzimidazoles in medicinal chemistry, emphasizing their wide range of uses, which include antibacterial, anticancer, and central nervous system actions. The structural properties of benzimidazoles and the effect of substituent changes on their biological activity are investigated, as well as crucial structure-activity relationship (SAR) investigations. The review looks into the synthesis of benzimidazole derivatives, including both traditional and novel methods. The rise of microwave-assisted synthesis, green chemistry methodologies, and solid phase strategies for chemical manufacturing are explored. A thorough review of current breakthroughs in benzimidazole medicinal chemistry emphasizes the importance of target-based drug design, high throughput screening, and computational approaches in expediting drug discovery. As prospective directions for future research, the numerous applications of benzimidazoles in personalized medicine, nanotechnology-assisted medication delivery, and the examination of natural sources for chemical discovery are noted. However, concerns about toxicity, pharmacokinetic limits, and intellectual property difficulties have been raised, leading a cautious assessment of benzimidazole-based therapies. Benzimidazoles, medicinal chemistry, pharmacological activities, synthesis methodologies, structure-activity connection, drug discovery, and future possibilities are some of the keywords used in this study. Current (fluid) ; Chemistry ; Nanotechnology ; Data science ; Engineering ; Computer science ; Materials science Synthesis and biological activity ; Synthesis and Characterization of Heterocyclic Compounds ; Click Chemistry and Applications
Authors: Zaman Abdalhussein Ibadi Alaridhee
Source: Mağallaẗ Al-Maʿhad Al-ʿālī Lil Dirāsāt Al-Nawʿiyyaẗ /Mağallaẗ Al-Maʿhad Al-ʿālī Lil Dirāsāt Al-Nawʿiyyaẗ (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Charting the Unfolding Horizons of Bioinorganic Chemistry: Assessing Varied Applications and Spearheading Innovations for Future Biotechnological Landscapes The field of bioinorganic chemistry, sitting at the intersection of biology and inorganic chemistry, has experienced remarkable progress, significantly influencing diverse applications across various domains. This comprehensive review explores the multifaceted applications of bioinorganic chemistry, particularly its pivotal role in enzymatic reactions, metalloproteins, and biomaterials. It delves into the impact of bioinorganic chemistry on various biotechnological landscapes, emphasizing its potential contributions to drug development, environmental remediation, and energy conversion. Enzymatic reactions, crucial in biological processes, often involve metal ions, and bioinorganic chemistry plays a vital role in unraveling these intricate mechanisms. Metalloproteins, encompassing a wide array of biological functions, are thoroughly investigated for their structural and functional attributes, providing insights into cellular processes. Biomaterials, an integral part of medical and biotechnological advancements, benefit from the understanding of bioinorganic chemistry, influencing the development of innovative materials for diverse applications. The review assesses ongoing innovations within the field, including the exploration of bio-inspired catalysts and metal-based therapeutics. These innovations show promise for future advancements in catalysis and medical applications. The review underscores the expanding horizons of bioinorganic chemistry, positioning it as a key player in shaping the future of biotechnology. In conclusion, this extensive overview serves to chart the unfolding horizons of bioinorganic chemistry, offering a comprehensive understanding of its current applications and potential innovations. It highlights the interdisciplinary nature of the field and its instrumental role in spearheading advancements for the future of biotechnological landscapes. Bioinorganic chemistry ; Chemistry ; Nanotechnology ; Environmental chemistry ; Biochemical engineering ; Materials science ; Engineering ; Biochemistry Machine Learning in Materials Science ; Chemistry and Chemical Engineering ; Click Chemistry and Applications
Authors: Donghun Kim | G. M. Choi | Hyunwoo Kim
Source: ChemRxiv (preprint, 2024-12-27)
Field: Chemistry — Spectroscopy

Multi-substrate Screening for Asymmetric Catalysis Enabled by 19F NMR-based Simultaneous Chiral Analysis Exploring a broad chemical space is essential for advancing asymmetric catalysis, but the intricate nature of chiral catalysts demands highly resource-intensive optimization processes. Multi-substrate screening offers a promising solution for high-throughput screening (HTS). However, analyzing complex mixtures remains challenging and typically relies on chromatography-based methods. This study introduces ¹⁹F NMR spectroscopy for simultaneous chiral analysis, enabling accurate determination of yield and enantiomeric excess in multi-substrate screening. Applied to the ruthenium-catalyzed asymmetric reductive amination of ammonia with twenty-one distinct ketones, this method enables precise simultaneous chiral analysis through NMR shift reagent-induced dynamic peak shifts and splitting in ¹⁹F NMR spectra. This approach enhances HTS by simplifying the analysis of complex mixtures, providing a powerful tool to accelerate the discovery of chiral catalysts and optimize asymmetric reactions. Substrate (aquarium) ; Fluorine-19 NMR ; Catalysis ; Chemistry ; Combinatorial chemistry ; Chemical engineering ; Stereochemistry ; Organic chemistry ; Nuclear magnetic resonance spectroscopy ; Engineering ; Geology Molecular spectroscopy and chirality ; Surface Chemistry and Catalysis ; Advanced NMR Techniques and Applications
Authors: Mohamed S.H. Salem | Rubal Sharma | Seika Suzuki | Yoshitane Imai | Mitsuhiro Arisawa | Shinobu Takizawa
Source: Institutional Repositories DataBase (IRDB) (article, 2024-05-02)
Field: Chemistry — Organic Chemistry

Impact of helical elongation of symmetric oxa[n]helicenes on their structural, photophysical, and chiroptical characteristics Salem M.S.H., Sharma R., Suzuki S., et al. Impact of helical elongation of symmetric oxa[n]helicenes on their structural, photophysical, and chiroptical characteristics. Chirality 36, e23673 (2024); https://doi.org/10.1002/chir.23673. Elongation ; Chirality (physics) ; Circular dichroism ; Molecular conformation Synthesis and Properties of Aromatic Compounds ; Photochromic and Fluorescence Chemistry ; Liquid Crystal Research Advancements
Authors: Ziyi Zhu | Jinjiang He | Yongjun Li | Junfeng Luo | Guojin Xu | Wenkui Yang | Dan Liu | Jiali Gao
Source: Coatings (article, 2024-02-21)
Field: Materials Science — Materials Chemistry

Microstructure Features and Mechanical Properties of Casted CoFeB Alloy Target CoFeB alloy, as a promising magneto-resistive material, has attracted extensive attention concerning the magnetic properties of its thin film in the field of magneto-resistive random memory (MRAM). Although there are many studies on the magnetic properties of CoFeB thin films, there is relatively little research on the microstructure and mechanical properties of casted CoFeB alloy. In this work, Co20Fe60B20 (at%) alloy was fabricated through the vacuum induction melting method, and its microstructure features and mechanical performance were studied. Scanning electron microscopy (SEM), electron back scatter diffraction (EBSD), and transmission electron microscopy (TEM) were utilized to characterize the microstructure, which consists of the coarse, needle-like Fe2B phase that crystallizes first, the primary lamellar binary eutectic structure (Fe2B + bcc-Fe), and the ternary eutectic structure (Fe3B + Fe2B + bcc-Fe phase). It is found that Fe3B precipitates on the Fe2B with a core–shell structure. The orientation of bcc-Fe is randomly distributed, while there are two main kinds of textures in Fe2B: {100} &lt;001&gt; and Gaussian texture {110} &lt;001&gt;. In terms of mechanical properties, Co20Fe60B20 alloy’s tensile strength is 140MPa, and the yield strength is 87MPa. Because the cracks are easy to generate and expand along the needle-shaped pre-crystallized Fe2B, the plasticity of Co20Fe60B20 alloy is very poor, only 1%. Microstructure ; Alloy ; Materials science ; Metallurgy Microstructure and mechanical properties ; Metal and Thin Film Mechanics ; Metallic Glasses and Amorphous Alloys