jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Panthima Phuangthong | Wen‐Wei Li | Jun Shen | Mohammadreza Nofar | Patnarin Worajittiphon | Yottha Srithep
Source: Polymers (article, 2024-07-26)
Field: Materials Science — Biomaterials

The Effect of Polyethylene Glycol on the Non-Isothermal Crystallization of Poly(L-lactide) and Poly(D-lactide) Blends The formation of polylactide stereocomplex (sc-PLA), involving the blending of poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA), enhances PLA materials by making them stronger and more heat-resistant. This study investigated the competitive crystallization behavior of homocrystals (HCs) and stereocomplex crystals (SCs) in a 50/50 PLLA/PDLA blend with added polyethylene glycol (PEG). PEG, with molecular weights of 400 g/mol and 35,000 g/mol, was incorporated at concentrations ranging from 5% to 20% by weight. Differential scanning calorimetry (DSC) analysis revealed that PEG increased the crystallization temperature, promoted SC formation, and inhibited HC formation. PEG also acted as a plasticizer, lowering both melting and crystallization temperatures. The second heating DSC curve showed that the pure PLLA/PDLA blend had a 57.1% fraction of SC while adding 5% PEG with a molecular weight of 400 g/mol resulted in complete SC formation. In contrast, PEG with a molecular weight of 35,000 g/mol was less effective, allowing some HC formation. Additionally, PEG consistently promoted SC formation across various cooling rates (2, 5, 10, or 20 °C/min), demonstrating a robust influence under different conditions. Crystallization ; Differential scanning calorimetry ; PEG ratio ; Polyethylene glycol ; Lactide ; Materials science ; Polymer chemistry ; Plasticizer ; Chemical engineering ; Copolymer ; Polymer ; Composite material biodegradable polymer synthesis and properties ; Microplastics and Plastic Pollution ; Carbon dioxide utilization in catalysis
Authors: Tommaso Frison | Andrei Irlweg | Öykü Ergül | D. Totev | Remco Tuinier | A. Catarina C. Esteves
Source: Progress in Organic Coatings (article, 2024-12-26)
Field: Chemistry — Organic Chemistry

Electron beam-induced cationic polymerization drives structure and properties of epoxy coatings In the quest for sustainable yet high-performing coatings, Electron Beam-initiated cationic polymerizations of epoxy resins can advantageously combine the energy-efficient and highly productive features of EB curing to the desirable mechanical and chemical characteristics of epoxy coatings. Nevertheless, the relatively slow polymerization rate of EB cationic epoxy systems obstructs their widespread use compared to e.g. acrylate-functional resins polymerized by free radical mechanism. In this work, we report the preparation and characterization of a series of EB-cured cationic epoxy polymer coatings. We connect molecular properties (chemical structures of monomers and cationic initiators), curing conditions (EB irradiation parameters) and network characteristics, and show that epoxy coatings with good mechanical properties and no residual unreacted epoxy functionalities can be prepared in very short curing times without the need for thermal post-EBC treatments. Establishing structure–properties relationships in the cationic curing of commercially relevant epoxy resins represents a major first step towards a wider adoption of cationic curing technologies by the coating industry. • Cationic polymerization of two bifunctional epoxy monomers via Electron Beam Curing. • Monomer conversions >95 % from mild EBC conditions and no thermal post- processing. • Balance between crosslinking and network degradation driving formation process. • Coating mechanical properties steered by employed EBC conditions. Materials science ; Cationic polymerization ; Epoxy ; Polymerization ; Cathode ray ; Composite material ; Electron ; Polymer chemistry ; Chemical engineering ; Polymer Photopolymerization techniques and applications ; Surface Modification and Superhydrophobicity ; Advancements in Photolithography Techniques
Authors: Fátima Aparicio | Irene Sancho‐Casado | Paula B. Chamorro | Marina González‐Sánchez | Sílvia Pujals | Víctor Vega‐Mayoral | David González‐Rodríguez
Source: Chemistry - A European Journal (article, 2024-07-31)
Field: Materials Science — Biomaterials

Self‐Assembly of Chemically Programmed Amphiphiles into Aqueous Nanotubes with a Lipophilic Lumen The creation of complex hollow nanostructures with precise control over size and shape represents a great challenge in supramolecular soft materials. Here, we have further developed a bioinspired methodology for the formation of aqueous nanotubes of well-defined dimensions and pore coating through the self-assembly of amphiphiles that are chemically programmed with complementary nucleobases. These nanotubes are endowed with a hydrophobic lumen, whose diameter can be expanded as a function of the monomer length, in which apolar dyes can be efficiently encapsulated. Amphiphile ; Supramolecular chemistry ; Aqueous solution ; Self-assembly ; Monomer ; Nanostructure ; Nanotechnology ; Materials science ; Coating ; Chemical engineering ; Nucleobase ; Chemistry ; Organic chemistry ; Polymer ; Copolymer ; Molecule ; DNA ; Biochemistry Supramolecular Self-Assembly in Materials ; Supramolecular Chemistry and Complexes ; Porphyrin and Phthalocyanine Chemistry
Authors: Xinyang Shao | Meng Tian | Junlong Yin | Haifeng Duan | Ye Tian | Hui Wang | Changsheng Xia | Ziwei Wang | Yanxi Zhu | Yifan Wang | Lingxiao Chaihu | Minjie Tan | Hongwei Wang | Yanyi Huang | Jianbin Wang | Guanbo Wang
Source: Nature Communications (article, 2024-10-05)
Field: Chemistry — Spectroscopy

Biofunctionalized dissolvable hydrogel microbeads enable efficient characterization of native protein complexes The characterization of protein complex is vital for unraveling biological mechanisms in various life processes. Despite advancements in biophysical tools, the capture of non-covalent complexes and deciphering of their biochemical composition continue to present challenges for low-input samples. Here we introduce SNAP-MS, a Stationary-phase-dissolvable Native Affinity Purification and Mass Spectrometric characterization strategy. It allows for highly efficient purification and characterization from inputs at the pico-mole level. SNAP-MS replaces traditional elution with matrix dissolving during the recovery of captured targets, enabling the use of high-affinity bait-target pairs and eliminates interstitial voids. The purified intact protein complexes are compatible with native MS, which provides structural information including stoichiometry, topology, and distribution of proteoforms, size variants and interaction states. An algorithm utilizes the bait as a charge remover and mass corrector significantly enhances the accuracy of analyzing heterogeneously glycosylated complexes. With a sample-to-data time as brief as 2 hours, SNAP-MS demonstrates considerable versatility in characterizing native complexes from biological samples, including blood samples. Characterization (materials science) ; Mass spectrometry ; Chemistry ; Elution ; Dissolution ; Matrix (chemical analysis) ; Nanotechnology ; Covalent bond ; Chromatography ; Materials science ; Biophysics ; Combinatorial chemistry ; Biology ; Organic chemistry Mass Spectrometry Techniques and Applications ; Advanced Proteomics Techniques and Applications ; Monoclonal and Polyclonal Antibodies Research
Authors: Bishnu Choudhary | Shahid Anwar
Source: Materials Advances (article, 2024-01-01)
Field: Materials Science — Materials Chemistry

Dual-phase Yb-doped La<sub>2</sub>Ce<sub>2</sub>O<sub>7</sub> materials for fuel flexible SOFCs Demonstrating the dual phase Yb-doped La 2 Ce 2 O 7 materials for fuel flexible SOFCs. Yb doped LCO in anode is found to be catalytic active in methane fuel. Doping ; Materials science ; Phase (matter) ; Fuel cells ; Physics ; Chemical engineering ; Optoelectronics ; Engineering Advancements in Solid Oxide Fuel Cells ; Electronic and Structural Properties of Oxides ; Catalysis and Oxidation Reactions
Authors: Yuvashree Chandrasekaran | S Jagadeeswari | Manickam Dakshinamoorthi Balakumaran | Rushika Sri D | Kiran Sharma B
Source: Biosciences Biotechnology Research Asia (article, 2024-07-01)
Field: Materials Science — Biomaterials

Scaling New Depths: Innovations in Fish Collagen Extraction and Biomedical Frontiers Explored ABSTRACT: Collagen is a fibrous protein commonly found in the bodies of human and other animals. It is referred to be the most abundant protein which comprises 30% of animal’s overall protein. It is broadly used in diverse applications such as food, pharmaceutical, biomaterials, cosmetics, and biomedical industries. Fish waste is one of the cost-effective sources of collagen. The increasing adoption of marine-based and freshwater-based collagen is driven by their distinctive properties, which include advantages over mammalian-based collagen. These advantages encompass the absence of disease transmission risks, freedom from religious restrictions, cost-effective production, biocompatibility, and enhanced absorption within the human biological system. This review provides an overview of recent research regarding the extraction of collagen from marine and freshwater sources, with a specific focus on fish by-products. It encompasses subjects including the primary sources of fish collagen, pretreatment of fish materials, extraction techniques, collagen characterization, and its wide-ranging applications. More particularly, the study focuses at the procedures used to extract fish collagen, with an emphasis on isolating acid-soluble collagen (ASC) and pepsin-soluble collagen (PSC). Likewise, the fish derived collagen’s application in biomedical engineering such as drug delivery systems, tissue engineering, therapeutic applications and cosmetic industry is summarized. Biocompatibility ; Cosmetics ; Ingredient ; Fish <Actinopterygii> ; Drug delivery ; Tissue engineering ; Biochemical engineering ; Nanotechnology ; Chemistry ; Extraction (chemistry) ; Biotechnology ; Biomedical engineering ; Fishery ; Materials science ; Biology ; Food science ; Medicine ; Engineering ; Chromatography Collagen: Extraction and Characterization ; Protein Hydrolysis and Bioactive Peptides ; Silk-based biomaterials and applications
Authors: A. Lazaro-Romero | Silvia Maribel Contreras-Ramos | Mariamne Dehonor‐Gómez | José Manuel Rojas-García | Lorena Amaya-Delgado
Source: Heliyon (article, 2024-04-01)
Field: Materials Science — Biomaterials

Optimizing cellulose fraction for enhanced utility: Comparative pre-treatment of Agave tequilana Weber var. blue bagasse fiber for sustainable applications In recent decades, natural fibers have emerged as an alternative to synthetic fibers due to their renewable nature, lower environmental impact, and comparable strength properties. Agave bagasse, a byproduct of agave juice extraction in Mexico, stands out for its potential in various industrial applications, notably biocomposite production. Bagasse is rich in cellulose, along with hemicellulose and lignin. Cellulose is the most suitable to be converted into valuable products, and it is versatile, renewable, and biodegradable. An effective pre-treatment is crucial to enrich its fraction. This study aims to determine the optimal pre-treatment conditions for the agave bagasse. Three different pre-treatments were tested, acid (H<sub>2</sub>SO<sub>4</sub>), enzymatic (Cellic® HTec2 enzymatic preparation), and sequence of acid-enzymatic (sulfuric acid and Cellic® HTec2), to determine which pre-treatment got the optimal cellulose fraction increase. The acid pre-treatment was conducted over three time ranges (5, 10, and 15 min) at different acid concentrations (1%, 1.5%, and 2%). Enzymatic reactions were conducted over 24 h, testing three different enzyme concentrations (1.5%, 3%, 4.5%). The sequential pre-treatment utilized the optimal conditions derived from the acid experiments (1.5% H<sub>2</sub>SO<sub>4</sub> for 10 min), followed by enzymatic reactions carried out over three different durations (6, 12, and 24 h). The findings revealed that a 1.5% acid concentration applied for 10 min was the most efficient pre-treatment method. This pre-treatment resulted in a 1.9-fold increase in the cellulose fraction while reducing hemicellulose content by 30%. The hemicellulose reduction was confirmed through Fourier Transform IR spectroscopy (FTIR) analysis, complemented by scanning electron microscopy (SEM) observations highlighting physical alterations in the fiber structure. Furthermore, thermogravimetric analysis (TGA) demonstrated improved thermal stability, suggesting potential use in biocomposites. Future research should evaluate the environmental impact of optimized pre-treatment methods for agave bagasse. Agave ; Bagasse ; Cellulose ; Fiber ; Pulp and paper industry ; Fraction (chemistry) ; Materials science ; Chemical engineering ; Chemistry ; Engineering ; Botany ; Composite material ; Chromatography ; Biology Advanced Cellulose Research Studies ; Polysaccharides Composition and Applications ; Botanical Research and Applications
Authors: Fredrik Gjerstad Støpamo | Irina Sulaeva | David Budischowsky | Jenni Rahikainen | Kaisa Marjamaa | Kristiina Kruus | Antje Potthast | Vincent G. H. Eijsink | Anikó Várnai
Source: Biotechnology for Biofuels and Bioproducts (article, 2024-08-24)
Field: Materials Science — Biomaterials

The impact of the carbohydrate-binding module on how a lytic polysaccharide monooxygenase modifies cellulose fibers These results demonstrate the capability of LPMOs to modify cellulose fibers from surface to core and reveal how variation in enzyme modularity can be used to generate varying cellulose-based materials. While the implications of these findings for LPMO-based cellulose fiber engineering remain to be explored, it is clear that the presence of a CBM is an important determinant of the three-dimensional distribution of oxidation sites in the fiber. Cellulose ; Carbohydrate-binding module ; Monooxygenase ; Fiber ; Polysaccharide ; Chemistry ; Lytic cycle ; Biochemistry ; Enzyme ; Substrate (aquarium) ; Cell wall ; Biophysics ; Cellulase ; Biology ; Organic chemistry Advanced Cellulose Research Studies ; Biofuel production and bioconversion ; Enzyme-mediated dye degradation
Authors: Ethem İlhan Şahin | Jamal Eldin F. M. Ibrahim | Mehriban Emek | Bahaddin Si̇nsoysal | Alina Amanzholova
Source: Journal of Materials Science Materials in Electronics (article, 2024-07-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Structural and shielding effectiveness properties of (NiFe2O4/chopped strands) composites for 6.5–18 GHz applications Abstract In this research, a mixed oxide technique was employed to create composite materials comprising NiFe 2 O 4 -chopped strands, aimed at evaluating their structural properties and microwave shielding effectiveness. The composites, produced through a hot-pressing process with varying proportions of NiFe 2 O 4 and chopped strands, were integrated with epoxy to enhance their shielding capabilities. X-ray diffraction confirmed the formation of single-phase NiFe 2 O 4 , free from secondary phases. Scanning electron microscopy analysis corroborated the presence of cubic crystalline NiFe 2 O 4 , without microstructural impurities. The microwave shielding performance of the composites was assessed within the 6.5–18 GHz frequency range using a network analyzer (NA), revealing a minimum shielding effectiveness of − 36.34 dB at 16.56 GHz for a 1.3 mm thick sample. These findings demonstrate the successful fabrication of NiFe 2 O 4 -chopped strands composites with tunable microwave shielding properties, achieved by adjusting the NiFe 2 O 4 content, allowing for tailored performance across various frequency bands. Electromagnetic shielding ; Composite material ; Materials science Electromagnetic wave absorption materials ; Advanced Antenna and Metasurface Technologies ; Magnetic Properties and Synthesis of Ferrites
Authors: Leon Schumacher | Marc Ziemba | Christian Heß
Source: ChemCatChem (article, 2024-07-16)
Field: Materials Science — Materials Chemistry

Investigation of the CO<sub>2</sub> Activation and Regeneration of Reduced VO<sub>x</sub>/CeO<sub>2</sub> Catalysts Using Multiple In Situ Spectroscopies Abstract Ceria‐supported vanadium oxide (VO x /CeO 2 ) is an important catalyst for various oxidation reactions. Recently, vanadia has emerged again as a less toxic alternative to CrO x ‐based catalysts for the CO 2 ‐assisted oxidative dehydrogenation (ODH) of alkanes. To establish a mechanistic understanding of catalyst regeneration during CO 2 exposure, often described as the rate‐limiting step of these reactions, we investigated the regeneration of VO x /CeO 2 catalysts with different vanadia loadings using multiple in situ spectroscopies, that is, multi‐wavelength Raman, UV‐Vis, IR and X‐ray photoelectron spectroscopy. Time‐dependent analysis reveals that ceria is only partially regenerated in the bulk but fully regenerated in the subsurface. At the surface, stable carbonates form at vacancies, which are able to regenerate the lattice and deactivate ceria surface oxygen. The VO x /CeO 2 samples show a loading‐dependent behavior, with low‐loaded samples regenerating vanadia only partially, due to the high concentration of monomers, while at higher loadings, vanadia can be almost fully regenerated due to the higher nuclearities being thermodynamically more stable. Ceria is regenerated faster than vanadia, indicating that vanadia regenerates by oxygen spill‐over from the ceria lattice. Our results provide important mechanistic insight into CO 2 activation over supported vanadia catalysts, which is of great relevance for CO 2 ‐assisted ODH reactions. In situ ; Catalysis ; Regeneration (biology) ; Chemistry ; Chemical engineering ; Materials science ; Organic chemistry ; Cell biology ; Biology ; Engineering Catalytic Processes in Materials Science ; Catalysis and Oxidation Reactions ; Catalysts for Methane Reforming
Authors: Jiang‐Ling Shi | Youcheng Wang | Yufeng Han | Jinqi Chen | Xiaolan Pu | Ying Xia
Source: Science Advances (article, 2024-12-18)
Field: Chemistry — Organic Chemistry

Hydroalkylation of unactivated olefins with C(sp <sup>3</sup> )─H compounds enabled by NiH-catalyzed radical relay The hydroalkylation reaction of olefins with alkanes is a highly desirable synthetic transformation toward the construction of C(sp<sup>3</sup>)─C(sp<sup>3</sup>) bonds. However, such transformation has proven to be challenging for unactivated olefins, particularly when the substrates lack directing groups or acidic C(sp<sup>3</sup>)─H bonds. Here, we address this challenge by merging NiH-catalyzed radical relay strategy with a HAT (hydrogen atom transfer) process. In this catalytic system, a nucleophilic alkyl radical is generated from a C(sp<sup>3</sup>)─H compound in the presence of a HAT promotor, which couples with an alkyl metallic intermediate generated from the olefin substrate with a NiH catalyst to form the C(sp<sup>3</sup>)─C(sp<sup>3</sup>) bond. Starting from easily available materials, the reaction not only demonstrates wide functional group compatibility but also provides hydroalkylation products with regiodivergence and excellent enantioselectivity through effective catalyst control under mild conditions. Catalysis ; Olefin fiber ; Chemistry ; Alkyl ; Combinatorial chemistry ; Nucleophile ; Substrate (aquarium) ; Radical ; Hydrogen bond ; Medicinal chemistry ; Organic chemistry ; Molecule ; Biology Catalytic C–H Functionalization Methods ; Radical Photochemical Reactions ; Sulfur-Based Synthesis Techniques
Authors: Samriddh Srivastava | Garima Mathur
Source: Brazilian Journal of Microbiology (article, 2024-05-31)
Field: Materials Science — Biomaterials

Statistical optimization of bioprocess parameters for enhanced production of bacterial cellulose from K. saccharivorans BC-G1 Bacterial Cellulose (BC) offers a wide range of applications across various industries, including food, biomedical, and textiles, owing to its distinctive properties. Its unique 3D reticulated network of cellulose nanofibers, imparts excellent mechanical qualities, a high water-holding capacity, and thermal stability. Additionally, it possesses remarkable biocompatibility, biodegradability, high crystallinity, and purity. These attributes have offered significant interest in BC within both academic and industrial sectors. However, BC production is associated with high costs due to the use of expensive growth media and low yields. The study reports the potential of our indigenous isolate, Komagataeibacter saccharivorans BC-G1, as BC producer. Statistical optimization of BC production was carried out using Placket-Burman design and Central composite design, by selecting different parameters. Eight significant factors such as temperature, pH, glucose, yeast, peptone, acetic acid, incubation time and % inoculum were studies using ANOVA-based response surface methodology. Results showed that BC yield (8.5 g/L) with 1.8-fold after optimization of parameters. Maximum cellulose production (8.5 ± 1.8 g/L) was obtained using 2% glucose, 0.3% yeast extract, 0.3% peptone, 0.75% (v/v) acetic acid at pH 7.0 for 10 days of incubation with 4% inoculum at 25 °C under static culture. Main effect graph showed incubation time and acetic acid concentration as the most significant parameters affecting BC production in our study. The physicochemical characterization of produced BC was done using FTIR, XRD and SEM techniques. Bioprocess ; Bacterial cellulose ; Cellulose ; Production (economics) ; Biotechnology ; Food science ; Pulp and paper industry ; Chemistry ; Biochemical engineering ; Biology ; Chemical engineering ; Biochemistry ; Engineering ; Economics Advanced Cellulose Research Studies ; Biofuel production and bioconversion ; Enzyme Production and Characterization
Authors: S. A. A. B. Thejasiri | K. M. D. C. Jayathilaka | F. S. B. Kafi | L. S. R. Kumara | Okkyun Seo | Satoshi Yasuno | Osami Sakata | W. Siripala | R.P. Wijesundera
Source: Coatings (article, 2024-07-25)
Field: Materials Science — Materials Chemistry

Cu2O Homojunction Solar Cells: Efficiency Enhancement with a High Short Circuit Current Cu2O homojunction solar cells were fabricated using potentiostatic electrodeposition technique. n-Cu2O thin films were grown in an acetate bath while p-Cu2O thin films were grown in a lactate bath. In the growth of n-Cu2O films, cupric acetate concentration, pH and temperature of the bath, deposition potential and duration (film thickness) and annealing temperature were investigated. In the growth of p-Cu2O on n-Cu2O, concentration of copper sulphate and lactic acid solutions, pH and temperature of the bath, deposition potential and duration were investigated. In addition, the procedure of sulfidation of p-Cu2O film surface using (NH4)2S vapor, before depositing Au front contact, was also optimized to enhance the photoactive performance. The structural, morphological and optoelectronic properties of the Cu2O films were investigated using scanning electron microscopy (SEMs), high energy X-ray diffraction (HEXRD), hard X-ray photoelectron spectroscopy (HAXPES), spectral response and current–voltage (J-V) measurements. The best Cu2O homojunction solar cell exhibited Voc = 460 mV, Jsc = 12.99 mA·cm−2, FF = 42% and η = 2.51%, under AM 1.5 illumination. Efficiency enhancement with the record high Jsc value for the Cu2O homojunction solar cell has mainly been due to the optimization of pH of the n-Cu2O deposition bath and lactic acid concentration of the p-Cu2O deposition bath. Homojunction ; X-ray photoelectron spectroscopy ; Materials science ; Chemical bath deposition ; Solar cell ; Thin film ; Scanning electron microscope ; Analytical Chemistry (journal) ; Chemical engineering ; Optoelectronics ; Nanotechnology ; Chemistry ; Composite material ; Heterojunction Copper-based nanomaterials and applications ; ZnO doping and properties ; Electronic and Structural Properties of Oxides