jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Hlalanathi Sibiya | Prashant Bhagwat | Kugen Permaul | Santhosh Pillai
Source: Chemical Papers (article, 2024-11-22)
Field: Materials Science — Biomaterials

Biochemical and structural characterisation of thermostable acid- and pepsin-soluble collagens from South African Geelbek (Atractoscion aequidens) scales and its potential application in film formation Abstract Fish processing typically generates large amounts of non-edible by-products, which contain collagen protein as one of the principal constituents. In this study, the biochemical properties, in vitro fibril-forming potential and film-forming potential of acid (ASC)- and pepsin (PSC)-soluble collagens extracted from the scales of geelbek ( Atractoscion aequidens ) were evaluated. Based on ultraviolet absorption spectroscopy, electrophoretic pattern, Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) analysis, both ASC and PSC were classified as type I collagen. Further, amino acid composition analyses confirmed the presence of 326 and 319 glycine residues/1000 residues in ASC and PSC, respectively, which is characteristic of collagen. The collagens were thermally stable, with a maximum transition temperature of 112.27 °C for ASC and 113.41 °C for PSC. The collagens also demonstrated excellent fibril-forming potential, as indicated by SEM analysis. Being a bioactive material, the extracted collagen was further utilised to prepare collagen–chitosan films. The presence of collagen–chitosan interaction was revealed by FTIR spectra examination of the films, confirming a favourable modification of collagen’s secondary structure. Colour, differential scanning calorimetry and dynamic mechanical analysis demonstrated that the collagen–chitosan films had moderate colour indices and enhanced thermal properties. Overall, this study offers insights into biomaterial fabrication using geelbek collagen that could potentially be useful in the biomedical and food industries. Graphical abstract Fourier transform infrared spectroscopy ; Differential scanning calorimetry ; Chitosan ; Biomaterial ; Chemistry ; Type I collagen ; Pepsin ; Scanning electron microscope ; Infrared spectroscopy ; Fibril ; Biochemistry ; Nuclear chemistry ; Materials science ; Chemical engineering ; Enzyme ; Organic chemistry ; Composite material ; Biology Collagen: Extraction and Characterization ; Marine Biology and Environmental Chemistry ; Silk-based biomaterials and applications
Authors: Sida Wang | Rowan Walker-Gibbons | Bethany Watkins | Binghui Lin | Madhavi Krishnan
Source: arXiv (Cornell University) (preprint, 2024-05-20)
Field: Chemistry — Electrochemistry

Chemical control of self-assembly by the electrosolvation force Self-assembly of matter in solution generally relies on attractive interactions that overcome entropy and drive the formation of higher-order molecular and particulate structures. Such interactions play key roles in a variety of contexts, e.g., crystallisation, biomolecular folding and condensation, pathological protein aggregation, pharmaceuticals and fine chemicals. The electrosolvation force entails a new conceptual paradigm in the known palette of interactions that drive the spontaneous accretion and organisation of matter. However, an understanding of the underlying physical chemistry, and therefore the ability to exert control over and tune the interaction, remains incomplete. Here we demonstrate that this force arises from the structure of the interfacial electrolyte. Neutral molecules such as a different solvent, osmolytes or surfactants, can - even at very low concentrations in the medium - disrupt or reinforce pre-existing interfacial solvent structure, thereby furnishing unanticipated chemical tuning of the ability of matter to self-assemble. The observations further present unexpected mechanistic elements that may explain the impact of co-solvents and osmolytes on protein structure, stability and pathological protein condensation. Our findings shed new light on microscopic mechanisms that drive the emergence of order and structure from molecular to macroscopic scales in the solution phase. Control (management) ; Nanotechnology ; Materials science ; Computer science ; Artificial intelligence Electrochemical Analysis and Applications ; Advanced Chemical Sensor Technologies
Authors: Fathin Asila Mohd Pabli | Syifa’ Muhammad Sharifuddin | Muhammad Azwadi Sulaiman
Source: Malaysian Journal of Bioengineering and Technology (MJBeT) (review, 2024-12-20)
Field: Materials Science — Materials Chemistry

A Review on Microwave Processing Technique in the Synthesis of CaCu3Ti4O12 Microwave heating has a high potential technique to be used as an effective substitute for traditional furnace heating techniques in today's ceramic industries, including the synthesis of promising very high dielectric materials with relative permittivity, er = 105 of CaCu3Ti4O12 (CCTO). The microwave processing approach employs microwave radiation to heat materials more efficiently and uniformly to promote uniform densification. Hence, this approach improved the material’s characteristics tremendously compared to the traditional furnace. As microwave heating lowers the reaction times, it has the potential to save both money and energy compared to conventional heating techniques. In CCTO processing, microwave energy was commonly used to replace the heating technique in the calcination stage, sintering stage, or both. This review delves into the historical development and advancements in microwave processing methods within ceramic manufacturing, particularly focusing on CCTO electroceramics. The aim is to assess the viability of microwave processing as a complete substitute for conventional furnace heating techniques in the production of CCTO. Microwave ; Materials science ; Computer science ; Telecommunications Dielectric properties of ceramics
Authors: P. E. F. ROSSI | F. de A. R. dos SANTOS | A. C. A. [UNESP] Alves | L. H. SEMENSATO | L. de F. C. de OLIVEIRA | D. C. T. dos SANTOS | T. P. BIANCHI | N. M. INADA | S. P. CAMPANA-FILHO | R. L. ORÉFICE | D. S. CORREA
Source: LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

3D-Printed Methacrylated Gelatin−Lignin Carbon Dot Hydrogel Combined with PLA Nanofibers for Wound Dressings. Traditional wound dressings have limitations in terms of their antibacterial and anti-inflammatory properties, as well as their ability to maintain a moist wound environment. Addressing these deficiencies with innovative biomaterials, such as hydrogels combined with nanomaterials, can accelerate healing and perform a variety of functions in advanced biomedical materials. In this study, 3D-printed hydrogel membranes were designed and combined with nanofibrous PLA mats produced by the solution blow spinning technique (SBS) for use as a bilayered wound dressing. These membranes were manufactured from gelatin modified with methacrylamide groups (GMA), incorporated with bioactive lignin carbon dots (CDs), and cross-linked using ultraviolet (UV) light. The GMA membranes with the addition of lignin CDs showed antimicrobial activity against Staphylococcus aureus and Escherichia coli and greater mechanical deformation when combined with the PLA fibrous mats, in addition to not causing cytotoxic effects in human fibroblasts. Furthermore, the developed material was capable of maintaining a persistent hydrated environment in the wound area with adequate degradation capacity. Our results demonstrate the potential for manufacturing multifunctional wound dressings utilizing biodegradable and sustainable nanomaterials that are both cost-effective and straightforward to produce, with applications in biomedical fields, including the treatment of skin wound infections. Gelatin ; Membrane ; Biocompatibility ; Methacrylamide ; Self-healing hydrogels ; Electrospinning ; Wound dressing ; Wound healing Carbon and Quantum Dots Applications ; Electrospun Nanofibers in Biomedical Applications ; Wound Healing and Treatments
Authors: Laura Köring | Bernhard Birenheide | Felix Krämer | Jonas O. Wenzel | Roland Schoch | Martin Brehm | Frank Breher | Jan Paradies
Source: European Journal of Inorganic Chemistry (article, 2024-03-13)
Field: Chemistry — Organic Chemistry

Synthesis of Ferrocenyl Boranes and their Application as Lewis Acids in Epoxide Rearrangements Abstract A series of substituted ferrocenyl boron derivatives was synthesized. The oxidation of the ferrocenyl unit resulted in a significant increase of the boron‐centered Lewis acidity. The neutral and cationic Lewis acids were characterized by NMR spectroscopy, crystal structure analysis and by computational methods. The new Lewis acids were then applied in the Meinwald rearrangement of epoxides, predominantly furnishing aldehydes as the kinetic products. Chemistry ; Boranes ; Epoxide ; Lewis acids and bases ; Organic chemistry ; Ferrocene ; Combinatorial chemistry ; Boron ; Catalysis Organoboron and organosilicon chemistry ; Chemical Synthesis and Characterization ; Boron Compounds in Chemistry
Authors: C. L. Folcia | J. Ortega | Teresa Sierra | Alejandro Martínez‐Bueno | J. Etxebarría
Source: arXiv (Cornell University) (preprint, 2024-02-19)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Chiral ferroelectric nematic liquid crystals as materials for versatile laser devices We present a liquid-crystal laser device based on the chiral ferroelectric nematic phase (NF*). The laser medium is obtained by mixing a ferroelectric nematic material with a chiral agent and a small proportion of a fluorescent dye. Notably, in the NF* phase very low electric fields perpendicular to the helical axis are able to reorient the molecules, giving rise to a periodic structure whose director profile is not single harmonic but contains the contribution of various Fourier components. This feature induces the appearance of several photonic bandgaps whose spectral ranges depend on the field, which can be exploited to build tunable laser devices. Here we report the characterization of home-made NF* lasers that can be tunable under low electric fields and present laser action in two of the photonic bands of the material. The obtained results open a promising route for the design of new and more versatile liquid-crystal based lasers. Liquid crystal ; Ferroelectricity ; Materials science ; Laser ; Nanotechnology ; Optics ; Optoelectronics ; Physics ; Dielectric Liquid Crystal Research Advancements ; Advanced Optical Imaging Technologies ; Photorefractive and Nonlinear Optics
Authors: Syazwani Mohd Faizo | Naurah Mat Isa | Roshafima Rasit Ali | Nur Fathin Amirah Shafie | Mohd Yusof Hamzah | Zatil Izzah Ahmad Tarmizi
Source: Journal of Advanced Research Design (article, 2024-04-17)
Field: Chemistry — Organic Chemistry

Optimization of Parameters for Polydiacetylenes Vesicles using Response Surface Methodology as a Function of Calorimetric Sensor Polydiacetylenes (PDAs) are well-known materials that can be used as colorimetric stimulations sensors. PDA-based materials are usually produced though the self-assembly in an aqueous solution. Since the responses of PDA vesicles produced under different conditions changed, the PDA vesicles must be optimized. It was employed to optimize the irradiation dosage, concentration, temperature and solvent ratio for PDA vesicles by using the Box-Behnken experiment design. Box-Behnken Design (BBD) can help reduce the number of tests needed by analyzing several combinations of variable levels at the same time. The peak of optical shift characteristics of PDAs vesicles was enhanced in parallel with the optimization of optimal parameters. As a consequence, the conditions with the maximum optical absorbance as evaluated by UV-Vis Spectroscopy were preferable. Therefore, the results indicate that this model is reliable and can precisely identify the maximum response peak. It was concluded that the BBD experimental design concept could be effectively used to optimize the parameters for the formation of PDAs vesicles with the fewest number of experimental runs possible. The PDAs vesicles formed under these conditions will be used for further characterization and testing. As a consequence, the best optimal conditions for 10,12-pentacosadyinoic acid (PCDA) vesicles can be concluded at 2.0 mM monomer concentration, 65 degree celsius processing temperature and 50:50 solvent ratio used between chloroform and tetrahydrofuran. Polydiacetylenes ; Absorbance ; Vesicle ; Solvent ; Aqueous solution ; Response surface methodology ; Chloroform ; Materials science ; Box–Behnken design ; Biological system ; Chemistry ; Chemical engineering ; Nanotechnology ; Chromatography ; Monomer ; Polymer ; Organic chemistry ; Membrane Polydiacetylene-based materials and applications ; Supramolecular Self-Assembly in Materials ; Antimicrobial Peptides and Activities
Authors: Enikő Hornyák-Mester
Source: Multidiszciplináris Tudományok (article, 2024-10-24)
Field: Materials Science — Polymers and Plastics

Investigation of the effect of autoclave aging on polyurethane foams with low VOC content Six flexible polyurethane foam recipes using low VOC additives were formulated and the prepared samples were analysed for their mechanical and acoustic properties pre and post autoclave aging. The results were compared with a reference foam comprising traditional additives. Promising results were obtained, particularly in acoustic performance, with two formulations (W2, W3) exhibiting superior sound absorption compared to the reference sample. However, after the autoclave aging the value of the sound absorption coefficient drops suddenly in a given frequency range, which may also indicate the degradation of the cell structure. The compressive strength of the samples were lower in case of four out of six samples, which can be due to their lower density. Adjustments in foaming reaction could potentially mitigate this issue. After the autoclave aging the compressive strength significantly reduced in all cases including the reference sample, which indicates that when the foams are utilized in wet environments for extended periods of time they cannot be further used for bearing applications. Polyurethane ; Autoclave ; Materials science ; Chemical engineering ; Composite material ; Metallurgy ; Engineering Polymer composites and self-healing
Authors: Matthew P. Aldred | Fengxiong Li | Rong Kuang | Owen Lewis Thomas | Thomas E. Davies | Stuart H. Taylor | Peter J. Miedziak | Andrew E. Graham
Source: Tetrahedron Letters (article, 2024-03-26)
Field: Chemistry — Organic Chemistry

Nanoporous aluminosilicate mediated synthesis of 2- and 2,2-substituted 2,3-dihydroquinazolin-4(1H)-ones Chemistry ; Aluminosilicate ; Nanoporous ; Combinatorial chemistry ; Organic chemistry ; Medicinal chemistry ; Catalysis Quinazolinone synthesis and applications ; Microwave-Assisted Synthesis and Applications ; Multicomponent Synthesis of Heterocycles
Authors: A. N. Blokhin | Tatyana Kirila | A. B. Razina | Serafim Rodchenko | А. П. Филиппов | А. В. Теньковцев
Source: Journal of Polymer Science (article, 2024-12-29)
Field: Materials Science — Surfaces, Coatings and Films

Thermosensitive Molecular Brushes With Alternating Polyoxazoline Side Chains: Synthesis, Characterization, and Solubilization Properties ABSTRACT Using the “grafting through” approach, alternating polymer brushes with different lengths of the backbone and side chains are synthesized. Thermosensitive poly(2‐ethyl‐2‐oxazoline) and poly(2‐isopropyl‐2‐oxazoline) with styrene and maleimide moieties are used as the macromonomers. The prepared polymer brushes are characterized by molar masses in the range of 19,000–52,000 g·mol −1 and have a low dispersity Ð = 1.6–1.9. The number of side chains is from 10 to 20. The LCST behavior of alternating brushes in aqueous solutions is studied by light scattering and turbidimetry. Phase separation temperatures of aqueous solutions of alternating polymer brushes are varied from 37°C to 48°C depending on the length and number of the side chains, as well as on the polymer molar mass. The critical micelle concentrations depend on molar mass and the side chain length, changing from 1.12 × 10 −5 to 9.40 × 10 −4 mol·L −1 , as established by the method of solubilization of a hydrophobic dye. Using the Benesi–Hildebrand method, the binding constants for curcumin and polymer brush samples are determined; their values range from 360 to 63,400 L·mol −1 . It is shown that curcumin is effectively bound by polymer brush molecules in the aqueous solutions, which ensures the solubilization of hydrophobic curcumin in water. Lower critical solution temperature ; Side chain ; Molar mass ; Polymer chemistry ; Polymer ; Dispersity ; Aqueous solution ; Chemistry ; Poly(N-isopropylacrylamide) ; Organic chemistry ; Copolymer Polymer Surface Interaction Studies ; Dendrimers and Hyperbranched Polymers ; Advanced Polymer Synthesis and Characterization
Authors: Thi Linh Nguyen | Ngo Ha Son | Lê Văn Dương | Tạ Ngọc Đôn | Nguyễn Văn Khang
Source: Vietnam Journal of Catalysis and Adsorption (article, 2024-09-30)
Field: Materials Science — Materials Chemistry

Synthesis of aluminosilicate mesoporous material MSU-S from natural resources: Investigating the effects on the structure formation Zeolite seed-based mesoporous aluminosilicate material MSU-S is normally synthesized from pure chemicals. In the study, MSU-S material was synthesized using natural resources such as rice husk, and kaolin in Vietnam. Here, a systematic investigation is conducted to find the relationship between the synthesis conditions (aging time, hydrothermal time, hydrothermal temperature, pH environment) and the formation of mesoporous structure, as well as the material properties. The sample was characterized by XRD, TEM, N2 adsorption-desorption isotherms, and TGA-DSC. The MSU-S material has been synthesized successfully from rice husk and kaolin. The best conditions are aging time of 24 hours, and hydrothermal conditions at 95 oC during 96 hours with pH=9. The MSU-S has an ordered hexagonal mesoporous structure containing zeolite BEA seed. The pore diameter is concentrated at 2.9 nm. The BET surface area is calculated to be 770 m²/g. Thermal stability is determined to be up to 900 oC. Aluminosilicate ; Mesoporous material ; Natural (archaeology) ; Chemical engineering ; Materials science ; Chemistry ; Geology ; Organic chemistry ; Catalysis ; Engineering Mesoporous Materials and Catalysis ; Zeolite Catalysis and Synthesis ; Catalytic Processes in Materials Science
Authors: Hao Jiang | Bin Wu | Dominik Rufle | Liping Wang | Min Shi | Michaël Parmentier | Fabrice Gallou
Source: Helvetica Chimica Acta (article, 2024-08-11)
Field: Chemistry — Organic Chemistry

Micelle Enabled Buchwald‐Hartwig Amination in Water with the Bening by Design Surfactant TPGS‐750‐M for the Synthesis of the JAK Inhibitor 4‐((2‐Chlorophenyl)amino)‐6‐((6‐methylpyridin‐2‐yl)amino)nicotinamide Abstract An efficient and scalable Buchwald‐Hartwig amination towards the synthesis of the API candidate 4‐((2‐Chlorophenyl)amino)‐6‐((6‐methylpyridin‐2‐yl)amino)nicotinamide as a JAK inhibitor was described. The process was developed using water and a water‐miscible co‐solvent. It was facilitated by the benign by design surfactant TPGS‐750‐M, that promoted the robust and reliable preparation of our target compound in high yields, with improved reaction profile and via an operationally simple protocol. Chemistry ; Amination ; Pulmonary surfactant ; Micelle ; Nicotinamide ; Combinatorial chemistry ; Solvent ; Organic chemistry ; Reductive amination ; Amino acid ; Aqueous solution ; Biochemistry ; Enzyme Synthesis and Biological Evaluation ; Fungal Plant Pathogen Control ; Synthesis and biological activity
Authors: Romain Membrat | Tété Etonam Kondo | Aubert Agostini | Alexandre Vasseur | Paola Nava | Laurent Giordano | Alexandre Martinez | Didier Nuel | Stéphane Humbel
Source: Molecules (article, 2024-10-22)
Field: Chemistry — Inorganic Chemistry

The Adaptative Modulation of the Phosphinito–Phosphinous Acid Ligand: Computational Illustration Through Palladium-Catalyzed Alcohol Oxidation The phosphinito-phosphinous acid ligand (PAP) is a singular bidentate-like self-assembled ligand exhibiting dissymmetric but interchangeable electronic properties. This unusual structure has been used for the generation of active palladium hydride through alcohol oxidation. In this paper, we report the first theoretical highlight of the adaptative modulation ability of this ligand within a direct H-abstraction path for Pd and Pt catalyzed alcohol oxidation. A reaction forces study revealed rearrangements in the ligand self-assembling system triggered by a simple proton shift to promote the metal hydride generation via concerted six-center mechanism. We unveil here the peculiar behavior of the phosphinito-phosphinous acid ligand in this catalysis. Palladium ; Catalysis ; Alcohol oxidation ; Alcohol ; Ligand (biochemistry) ; Chemistry ; Modulation (music) ; Organic chemistry ; Biochemistry ; Receptor ; Physics Asymmetric Hydrogenation and Catalysis ; Organophosphorus compounds synthesis ; Polyoxometalates: Synthesis and Applications
Authors: Xiongfei An | Xupeng Yang | Canming Hu | Chengli Ding
Source: Polymers (article, 2024-07-09)
Field: Materials Science — Polymers and Plastics

Optimized Design of Material Preparation for Cotton Linters-Based Carbon Black Dispersion Stabilizers Based on Response Surface Methodology Carbon black particles possess dimensions on the nanometer or sub-nanometer scale. When utilized, these particles have a tendency to aggregate, which compromises their stability under storage conditions. To address this issue, a dispersant was prepared using cotton short fibers as raw materials through etherification and graft polymerization with acrylamide (AM) and 2-acrylamido-2-methylpropane sulfonic acid (AMPS) as raw materials. The dispersant was then used to disperse carbon black to test its dispersing performance. A response surface optimization test was utilized to ascertain the influence of AMPS monomer mass, AM monomer mass, and potassium persulfate (KPS) initiator mass on the dispersibility of carbon black during dispersant preparation, and a set of optimal preparation conditions were obtained. The dispersion stability of carbon black in water was assessed using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), elemental analysis (EA), thermogravimetric analysis (TG), zeta potential analysis, high magnification scanning electron microscopy (SEM), and contact angle measurements. Results revealed that the optimum mass ratio of carboxymethyl cellulose (CMC) to AMPS to AM was 1:0.69:1.67, with the KPS initiator comprising 1.56% of the total monomer mass. By incorporating the dispersant at a concentration of 37.50%, the particle size of carbon black particles was observed to decrease from 5.350 μm to 0.255 μm, and no agglomeration of carbon black particles occurred even after 3 weeks of storage. Dispersant ; Carbon black ; Materials science ; Carboxymethyl cellulose ; Thermogravimetric analysis ; Chemical engineering ; Zeta potential ; Monomer ; Dispersion (optics) ; Dispersion stability ; Fourier transform infrared spectroscopy ; Composite material ; Polymer chemistry ; Natural rubber ; Polymer ; Nanoparticle ; Nanotechnology ; Sodium Natural Fiber Reinforced Composites ; Fiber-reinforced polymer composites ; Advanced Cellulose Research Studies