jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Suman Bose
Source: International Journal of Advanced Chemistry Research (article, 2025-01-01)
Field: Chemistry — Inorganic Chemistry

Zeolite membrane synthesis on alumina support for molecular sieving of gas mixtures The first zeolite membranes for gas separation appeared in the early 1990s, yet producing defect-free films on porous supports at reasonable cost remains a persistent challenge. This research describes the hydrothermal synthesis of MFI-type (silicalite-1) zeolite membranes on tubular α-alumina supports and evaluates their performance in separating H₂/CH₄, H₂/N₂, and CO₂/N₂ binary mixtures. Synthesis gels with a SiO₂:TPAOH:H₂O molar composition of 1:0.32:165 were crystallized at 175°C for periods ranging from 6 to 72 hours. Gas permeation tests at 25-300°C showed that the membrane synthesized for 48 hours achieved a peak H₂/CH₄ ideal selectivity of 63.4 and H₂/N₂ selectivity of 52.8, both well above Knudsen values. H₂ permeance reached 33.2 × 10⁻⁷ mol•m⁻²•s⁻¹•Pa⁻¹ at 250°C. X-ray diffraction and scanning electron microscopy confirmed a continuous, intergrown polycrystalline layer roughly 8.3 µm thick. These results demonstrate that careful control of synthesis duration is the single most effective lever for minimizing intercrystalline defects. Permeance ; Zeolite ; Membrane ; Selectivity ; Gas separation ; Permeation ; Porosity ; Hydrothermal synthesis ; Molecular sieve Zeolite Catalysis and Synthesis ; Catalysts for Methane Reforming ; Membrane Separation and Gas Transport
Authors: Pengfei Yu | W. Y. Sun | Yaohong Suo | Yihan Wu
Source: Journal of Theoretical and Applied Mechanics/Mechanika Teoretyczna i Stosowana (article, 2025-10-17)
Field: Chemistry — Spectroscopy

Analysis of mechanochemical diffusion coupling processes based on transient continuum chemo-mechanical coupling theory Chemical diffusion is vital in materials science and energy technology.Current Fick and non-Fick theories overlook the transient nature of diffusion.By referring to biomechanical axioms, we incorporate the transient expansion process and introduce characteristic time.This paper explores chemo-mechanical coupling in a spherical structure via transient continuum theory.The results show characteristic time changes in the diffusion equation from parabolic to hyperbolic, yielding finite diffusion speed and wave-like behavior, offering a basis for optimizing systems like lithium-ion batteries. Coupling (piping) ; Transient (computer programming) ; Diffusion ; Diffusion theory ; Work (physics) Molecular spectroscopy and chirality ; Force Microscopy Techniques and Applications
Authors: Huỳnh Vủ Thanh Lương | Thành Phú Lê | Quốc Phú Dương | Trọng Tuân Nguyễn | Duy Toàn Phạm
Source: Dong Thap University Journal of Science (article, 2025-03-24)
Field: Materials Science — Polymers and Plastics

&lt;span&gt;&lt;strong&gt;Đánh giá quá trình hấp phụ methylene blue bằng nanocellulose từ xơ dừa tươi&lt;/strong&gt;&lt;/span&gt; Nghiên cứu này nhằm mục tiêu tổng hợp nanocellulose từ xơ dừa tươi và đánh giá khả năng hấp phụ chất màu hữu cơ Methylene Blue (MB). Các yếu tố ảnh hưởng đến khả năng hấp phụ MB trong môi trường nước, bao gồm pH, thời gian hấp phụ, nồng độ MB và nhiệt độ, đã được khảo sát. Các phương pháp phân tích như phân tích nhiệt trọng lượng (TGA), nhiễu xạ tia X (XRD), phổ hồng ngoại biến đổi (FT-IR), cùng với phân tích hình thái bề mặt bằng SEM và TEM, đã được sử dụng để đánh giá đặc tính của vật liệu và xác nhận quá trình tổng hợp nanocellulose từ xơ dừa tươi. Điều kiện tối ưu cho quá trình tổng hợp là sử dụng acid H2SO4 nồng độ 12 M với tỷ lệ 1:10 (w/v) xơ dừa:acid, thời gian phản ứng 45 phút ở 30°C. Kết quả cho thấy diện tích bề mặt riêng của Nanocellulose đạt 5,062 m²/g, với lỗ xốp thuộc loại mesopore có đường kính 23,724 Å. Vật liệu Nanocellulose cho thấy khả năng hấp phụ MB hiệu quả trong môi trường nước dưới các điều kiện tối ưu: pH 6, thời gian hấp phụ 15 giờ và nồng độ MB ban đầu 25 mg/L. Quá trình hấp phụ MB tuân theo mô hình đẳng nhiệt hấp phụ Langmuir, động học bậc hai và chủ yếu là quá trình hấp phụ vật lý. Methylene blue ; Span (engineering) ; Nanocellulose ; Chemistry ; Nuclear chemistry ; Organic chemistry ; Cellulose ; Catalysis ; Engineering ; Structural engineering Textile materials and evaluations ; Advanced Theoretical and Applied Studies in Material Sciences and Geometry
Authors: Haruna P. Wante | S. L. Yap | K. Y. Tsung | Haiyun Tan | L. K. Lim | Sabastine C. Ezike | Siaw Foon Lee
Source: The European Physical Journal Plus (article, 2025-09-05)
Field: Materials Science — Materials Chemistry

Nitrogen ion irradiation of carbon thin films using a dense plasma focus: enhanced doping and structural modifications Abstract Activated carbons (ACs) are widely used in supercapacitors and batteries due to their high surface area, well-developed porosity, cost-effectiveness, and scalability, making them ideal for commercial energy storage applications. In this study, carbon derived from coconut shells was processed into a thin film on a nickel substrate, synthesized via doctor blade deposition, and subjected to nitrogen ion beam irradiation (6, 12, and 24 shots) using a 3.0 kJ dense plasma focus (PF) device, operated at 2.54 kJ to produce carbon nitride. The PF device generated a high-energy ion beam (~ 72.40 keV) at 1.5 mbar within nanoseconds, with a flux of 7.2 × 10 27 ions m −2 s −1 and a fluence of 6.4 × 10 19 ions m −2 . The Lee model code estimated a nitrogen ion beam energy of 71.0 keV, closely matching the measured 72.40 keV, confirming the model’s reliability. EDX analysis revealed significant spectral changes, with nitrogen doping reaching 7.93% after 24 shots. The optimum doping content per shot is highest at lower shot counts, reaching 1.18% per shot for the 6-shot sample, and gradually decreasing with additional shots. FTIR confirmed nitrogen-related functional groups (C≡N, S − C≡N, and N = C = S), indicating successful incorporation of nitrogen. FESEM showed pores, bulges, blunt edges, and adatoms after nitrogen ion irradiation, indicating morphological changes. XRD of the 24-shot sample revealed new peaks at 52° and 76°, corresponding to the (004) and (110) planes, associated with nitrogen incorporation and surface modification. The crystallite size increased from 6.27 nm to 11.16 nm after 24 shots of nitrogen ion irradiation, indicating enhanced crystallinity. An interlayer spacing of 0.340 nm (3.40 Å), approaching the graphitic value of 3.35 Å, was observed after 24 shots, indicating the onset of graphitization. These findings confirm effective nitrogen doping and significant structural modifications. Irradiation ; Materials science ; Doping ; Plasma ; Carbon fibers ; Nitrogen ; Dense plasma focus ; Ion ; Thin film ; Focus (optics) ; Analytical Chemistry (journal) ; Radiochemistry ; Optoelectronics ; Nanotechnology ; Composite material ; Chemistry ; Optics ; Environmental chemistry ; Nuclear physics ; Physics ; Composite number Diamond and Carbon-based Materials Research ; Ion-surface interactions and analysis ; Carbon Nanotubes in Composites
Authors: Kaixin Wang | Esteban D. Gadea | Benjamin Money | Yamila Perez Sirkin | Damián A. Scherlis | Henry S. White | Valeria Molinero
Source: ChemRxiv (preprint, 2025-01-15)
Field: Materials Science — Materials Chemistry

Curved Nanoelectrodes Trigger Bubble Detachment and Enhance Gas Evolution Efficiency Nanobubble formation and pinning on nanoelectrodes significantly hinder the efficiency of gas evolution reactions, limiting the potential of hydrogen production technologies. This work uncovers the pivotal role of nanoelectrode curvature in influencing catalytic performance and nanobubble detachment. Using molecular dynamics simulations supported by experimental evidence, we establish that convex nanoelectrodes, such as those of hemispherical and spherical geometries, sustain higher catalytic performance by maintaining greater reactive surface exposure than flat or concave electrodes. Most importantly, we demonstrate that convex electrodes mitigate bubble pinning by promoting unlimited growth and spontaneous detachment. Surprisingly, our calculations reveal that bubble detachment contributes minimally to the overall current. Our findings provide a mechanistic framework for optimizing electrode geometry to enhance gas evolution efficiency, emphasizing the role of convex nanoparticles in maximizing surface exposure rather than relying primarily on bubble detachment dynamics to improve gas production rates. Bubble ; Gas bubble ; Materials science ; Environmental science ; Nanotechnology ; Mechanics ; Physics Catalytic Processes in Materials Science ; Gas Sensing Nanomaterials and Sensors ; Electrohydrodynamics and Fluid Dynamics
Authors: Marta Kajkowska | Miłosz Chychłowski | Michał Ptaszek | Sławomir Ertman
Source: Polymers (article, 2025-02-05)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Three-Dimensional Ordering of Nematic Liquid Crystals with Azimuth and Tilt Controlled by Patterned Photoalignment and Selective Polymer Stabilization In this paper, we present a novel approach for advanced, three-dimensional patterned ordering of nematic liquid crystals. Our method allows for simultaneous control of azimuth and tilt of molecules by using a two-step process based on patterned photoalignment (used to define azimuth) followed by selective polymer stabilization of molecules reorientated with an electric field (used to define tilt). We demonstrate that those two subsequent processes, realized with high-resolution patterned illumination with UV light, allow us to obtain multiple microdomains with independently controlled tilt and azimuth. It opens possibilities to create complex three-dimensional distributions of director within a single liquid crystal cell, which is impossible with any other technique so far. Moreover, although the polymer-stabilization process is used, it is still possible to retune the tilt of the molecules; however, the electric field intensity needed for tuning is slightly higher than in the non-polymerized areas of the sample. Liquid crystal ; Tilt (camera) ; Azimuth ; Materials science ; Polymer ; Electric field ; Optics ; Silicon ; Liquid-crystal display ; Polymerization ; Optoelectronics ; Composite material ; Physics ; Geometry Liquid Crystal Research Advancements ; Photonic Crystals and Applications ; Plant Reproductive Biology
Authors: Marta Kajkowska | Miłosz Chychłowski | Michał Ptaszek | Sławomir Ertman
Source: Preprints.org (preprint, 2025-01-17)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Three-Dimensional Ordering of Nematic Liquid Crystals with Azimuth and Tilt Controlled by Patterned Photoalignment and Selective Polymer Stabilization In this paper, we present a novel approach for advanced, three-dimensional patterned ordering of nematic liquid crystals. Our method allows for simultaneous control of azimuth and tilt of molecules by using a two-step process based on patterned photoalignment (used to define azimuth) followed by selective polymer stabilization of molecules reorientated with an electric field (used to define tilt). We demonstrate that those two subsequent processes, realized with high-resolution patterned illumination with UV light, allow us to obtain multiple microdomains with independently controlled tilt and azimuth. It opens possibilities to create complex three-dimensional distributions of director within a single liquid crystal cell, not possible with any other technique so far. Moreover, although the polymer-stabilization process is used, it is still possible to retune tilt of the molecules, however, the electric field intensity needed for tuning is slightly higher than in the non-polymerized areas of the sample. Liquid crystal ; Tilt (camera) ; Azimuth ; Polymer ; Materials science ; Optics ; Optoelectronics ; Composite material ; Physics ; Engineering ; Mechanical engineering Liquid Crystal Research Advancements ; Advanced Materials and Mechanics
Authors: Siyu Guo | Mehmet Mercangöz
Source: ASME Open Journal of Engineering (article, 2025-01-01)
Field: Materials Science — Materials Chemistry

Design and Evaluation of a Multitubular Catalytic Membrane Reactor for Onboard Ammonia Cracking in Commercial Aviation Abstract Ammonia is a promising zero-carbon fuel for aviation, but its low flame speed and high ignition temperature hinder direct use in gas turbines. While a blend of ammonia and hydrogen can enable stable combustion, supplying hydrogen onboard through storage poses significant technical challenges. To address this, we propose an onboard ammonia cracking system based on a novel multitubular catalytic membrane reactor that can decompose ammonia to hydrogen during flight. The reactor comprises 16 microtubes (1.05 m length, 0.1 m outer, 0.04 m inner diameter), each featuring a 0.75 m palladium membrane section for hydrogen separation and a 0.3 m silica membrane section for nitrogen removal. A detailed simulation model incorporating reaction kinetics, multicomponent diffusion, and permeation behavior is developed to assess performance. At 450 °C and 30 bar, the system achieves over 98.9% ammonia conversion with minimal pressure drop, processing up to 180 g/s per tube. Sensitivity analyses confirm strong thermal efficiency, scalability, and reactor stability under varying flow and packing conditions. The system is benchmarked against the fuel demands of Rolls-Royce Trent 900 and GP7000 engines, demonstrating feasibility for integration into large commercial aircraft such as the Airbus A380. This design offers a viable pathway toward zero-carbon, hydrogen-ammonia sustainable aviation fuel systems. Hydrogen ; Ammonia ; Membrane reactor ; Ignition system ; Catalysis ; Permeation ; Cracking ; Membrane ; Aviation fuel Catalytic Processes in Materials Science ; Ammonia Synthesis and Nitrogen Reduction ; Hydrogen Storage and Materials
Authors: Wenqian Gao | Wenjie Xin | Xueliang Mu
Source: Chemosensors (article, 2025-07-23)
Field: Chemistry — Inorganic Chemistry

Size-Selective Adsorption Phenomena and Kinetic Behavior of Alcohol Homologs in Metal–Organic Framework QCM Sensors: Reconciling Apparent Contradictions In this study, we systematically investigated the adsorption behavior of a titanium-based metal–organic framework (MOF) sensing layer on five primary alcohol homologs using the quartz crystal microbalance (QCM) technique. Unexpectedly, response signals were significantly enhanced for molecules exceeding the framework’s pore dimensions, contradicting conventional molecular sieving models. Further investigations revealed that the adsorption time constant (τa) is linearly proportional to the molecular diameter (R2=0.952) and the integral response (AUC) increases almost exponentially with the molecular weight (R2=0.891). Although the effective diffusion coefficient (Deff) decreases with increasing molecular size (Deff∝d−5.96, R2=0.981), the normalized diffusion hindrance ratio (Deff/Dgas) decreases logarithmically with an increasing diameter. Larger responses result from stronger host–guest interactions with the framework despite significant diffusion limitations for larger molecules. These findings demonstrate the synergistic regulation of adsorption and diffusion in MOF-QCM systems. Our investigation experimentally elucidates the ’size-selectivity paradox’ in microporous sensing interfaces and establishes a quantitative framework for optimizing sensor performance through balanced control of diffusion kinetics and interfacial interactions in similar materials. Adsorption ; Kinetic energy ; Quartz crystal microbalance ; Alcohol ; Chemistry ; Chemical engineering ; Physical chemistry ; Organic chemistry ; Engineering ; Physics Metal-Organic Frameworks: Synthesis and Applications ; Electrochemical Analysis and Applications ; Crystallization and Solubility Studies
Authors: Jintao Gao | Fanglan Guan | Yanhui Tang | Xiuyan Li | Tao Ma | Pei-Zhu Zheng
Source: Discover Chemistry. (article, 2025-09-26)
Field: Chemistry — Analytical Chemistry

Adsorption kinetic and equilibrium studies for maxilon blue GRL dye by cotton fiber in aqueous solutions The adsorption interaction between cotton fibers and dye maxilon blue GRL was systematically investigated under varying contact times, initial dye concentrations, pH, agitation speeds and temperatures; and the adsorption capacity of dyes increases with the increase of those five parameters. The kinetic and isotherm results showed that the saturated adsorption capacity qm and adsorption capacity KF exhibited temperature-dependent enhancement; both the equilibrium adsorption amount qe and the apparent rate constant k2 increase with elevated agitation speeds and temperatures. Thermodynamic analysis indicated a non-spontaneous endothermic process. The low activation energy and adsorption enthalpy change confirmed physical adsorption mechanisms. Understanding the interaction between fiber and dye is helpful for optimizing dye utilization in industrial processes and engineering modified cotton fibers for wastewater decolorization. Endothermic process ; Adsorption ; Enthalpy ; Aqueous solution ; Kinetic energy ; Fiber ; Exothermic reaction ; Equilibrium constant Dye analysis and toxicity ; Adsorption and biosorption for pollutant removal
Authors: Jia Kang | Ao-di Wang | Yaowen Zhang | Fei Dai | Jingjing Zhu | Chu-qiong Song | Gang-fu Song
Source: RSC Advances (article, 2025-01-01)
Field: Materials Science — Materials Chemistry

Resistance mechanism of soluble microbial products to silver nanoparticles in activated sludge: adsorption, bonding and influencing factors The extensive application of silver nanoparticles (AgNPs) has resulted in them ending up in wastewater treatment plant (WWTP) facilities at concentrations varying between 0.13 and 20.02 mg L<sup>-1</sup>. Soluble microbial products (SMPs) in activated sludge systems can form the first barrier against AgNPs before attached metabolites and microorganisms react with these biotoxicants. Based on this, the present study investigated the adsorption and bonding resistance mechanisms of AgNPs on SMPs in activated sludge systems and analysed the typical influencing factors. Analysis using quasi-second-order kinetics and the Freundlich isotherm model revealed that the adsorption of AgNPs onto SMP is chemisorption-controlled, with multi-layer adsorption being the main mechanism, and the adsorption capacity reached 263.9 mg g<sup>-1</sup> at 35 °C. Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses indicated that aldehydes, carbonyl groups, and amide groups in SMPs were able to interact with AgNPs through electrostatic forces, hydrogen bonding and chelate-forming, metal-bound organometallic complexes (M-C[double bond, length as m-dash]NOHC[double bond, length as m-dash]NOH-M), resulting in conformational changes in SMP proteins. An increase in pH and ionic strength favoured the resistance of SMPs to AgNPs, and as the valence of the metal cation increased, the enhancement of this resistance became more significant. This study confirmed that SMP functions as an effective natural adsorbent for immobilizing AgNPs in activated sludge systems and provides a mechanistic foundation for developing targeted <i>in situ</i> bioremediation strategies. Adsorption ; Activated sludge ; Chemistry ; Mechanism (biology) ; Chemical engineering ; Nanoparticle ; Waste management ; Organic chemistry ; Sewage treatment Nanoparticles: synthesis and applications ; Adsorption and biosorption for pollutant removal ; Graphene and Nanomaterials Applications
Authors: Isma Wulansari | Mohamad Yusuf Azhari
Source: Indonesian Journal of Pure and Applied Chemistry (article, 2025-11-23)
Field: Materials Science — Polymers and Plastics

IMPACT OF CLARIFYING AGENTS ON THE OPTICAL CLARITY OF PIGMENTED POLYPROPYLENE RESIN: A COMPLIANCE AND MIGRATION STUDY Efforts to improve visual clarity and color stability in polypropylene (PP)-based products are carried out by adding clarifying agents, namely a sorbitol-based clarifying agent (PA) and a dibenzylidene sorbitol clarifying agent (NX), which function to accelerate crystal nucleation in within the polymer matrix. PP is widely used for packaging and automotive applications due to its clarity and transparency. This study was conducted to examine compliance and migration studies, assessing the suitability of the additives against quality standards and their migration stability. Migration tests were conducted visually using polyvinyl chloride (PVC) sheets at 55°C, with a 16-hour heating process. Additionally, a complaint analysis based on a digital prototype form was developed to identify the root causes of customer complaints related to color inconsistency, using the 4M approach (Man, Material, Machine, Method). The formulation includes dye pigments (small in size and easily migratable), organic pigments (more stable), and polyethylene wax as an internal lubricant. The results showed that 6 out of 7 samples with dye pigments experienced color migration (intensity 1–2), while organic pigments showed no migration (intensity 0). Clarifying agent improved clarity but failed to prevent pigment migration. Findings suggest that future research should focus on optimizing clarifying agents and additives to enhance pigment stability and durability. CLARITY ; Polypropylene ; Pigment ; Polymer ; Quality (philosophy) Polymer Science and PVC ; Polymer crystallization and properties ; Effects and risks of endocrine disrupting chemicals
Authors: Giacomo Biagiotti | Edvin Purić | Jacopo Tricomi | Janez Mravljak | Stefano Cicchi | Marco Laurati | Yvette van Kooyk | Fabrizio Chiodo | Iztok Urbančič | Marko Anderluh | Barbara Richichi
Source: RSC Chemical Biology (article, 2025-12-05)
Field: Materials Science — Materials Chemistry

A nonavalent BODIPY with a multivalent arrangement of α-mannosides enables lectins recognition in fluorescence-based assays We report here the use of Tris-BODIPY-OH as a scaffold for the multivalent display of sugar heads. A chloroacetyl thioether ligation reaction easily yields mannosylated BODIPYs, named Man<sub>9</sub>-BODIPY and (Man-TEG)<sub>9</sub>-BODIPY, which display nine mannose residues. Regardless of the linker length, both glycoBODIPYs provide an arrangement of mannose heads that allows for proper recognition by the carbohydrate binding domain of concanavalin A (ConA). Moreover, the interactions of Man<sub>9</sub>-BODIPY with relevant human lectins, <i>i.e.</i> dendritic cell-specific intercellular adhesion molecule-3-grabbing non-integrin (DC-SIGN) and langerin, were further investigated. The approach proposed is versatile and paves the way for the development of multivalent and fluorescent glyco-BODIPY probes useful to interrogate carbohydrate-lectin interactions in different biological contexts. Linker ; Concanavalin A ; BODIPY ; Mannose ; Lectin ; Fluorescence ; Glycoprotein ; Thioether ; Transfection Luminescence and Fluorescent Materials ; Polydiacetylene-based materials and applications ; Molecular Sensors and Ion Detection