jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Wenwen Yuan | Hang Yuan | Sixuan Duan | Ruiqi Yong | Jia Zhu | Eng Gee Lim | Ivona Z. Mitrović | Pengfei Song
Source: Journal of Visualized Experiments (article, 2023-10-06)
Field: Materials Science — Biomaterials

Microembossing: A Convenient Process for Fabricating Microchannels on Nanocellulose Paper-Based Microfluidics Nanopaper, derived from nanofibrillated cellulose, has generated considerable interest as a promising material for microfluidic applications. Its appeal lies in a range of excellent qualities, including an exceptionally smooth surface, outstanding optical transparency, a uniform nanofiber matrix with nanoscale porosity, and customizable chemical properties. Despite the rapid growth of nanopaper-based microfluidics, the current techniques used to create microchannels on nanopaper, such as 3D printing, spray coating, or manual cutting and assembly, which are crucial for practical applications, still possess certain limitations, notably susceptibility to contamination. Furthermore, these methods are restricted to the production of millimeter-sized channels. This study introduces a straightforward process that utilizes convenient plastic micro-molds for simple microembossing operations to fabricate microchannels on nanopaper, achieving a minimum width of 200 µm. The developed microchannel outperforms existing approaches, achieving a fourfold improvement, and can be fabricated within 45 min. Furthermore, fabrication parameters have been optimized, and a convenient quick-reference table is provided for application developers. The proof-of-concept for a laminar mixer, droplet generator, and functional nanopaper-based analytical devices (NanoPADs) designed for Rhodamine B sensing using surface-enhanced Raman spectroscopy was demonstrated. Notably, the NanoPADs exhibited exceptional performance with improved limits of detection. These outstanding results can be attributed to the superior optical properties of nanopaper and the recently developed accurate microembossing method, enabling the integration and fine-tuning of the NanoPADs. Microfluidics ; Nanotechnology ; Nanocellulose ; Materials science ; Fabrication ; Microchannel ; Coating ; Computer science ; Cellulose ; Engineering Electrospun Nanofibers in Biomedical Applications ; Biosensors and Analytical Detection ; Microfluidic and Bio-sensing Technologies
Authors: Melike Sarıçam | Merve Ercan Ayra | Mustafa Çulha
Source: ACS Omega (article, 2023-10-31)
Field: Materials Science — Biomaterials

Systematic Investigation of Cellular Response to Hydroxyl Group Orientation Differences on Gold Glyconanoparticles Nanoparticle (NP) surfaces act as the interface as they interact with living systems and play a critical role in defining their cellular response. The nature of these interactions should be well understood to design safer and more effective NPs to be used in a wide range of biomedical applications. At the moment, it is not clear how a subtle change in surface chemistry will affect an NP's behavior in a biological system. Thus, understanding the role of such a small change is critical and may allow one to fine-tune a biological response. In this study, the cellular response to -OH orientation differences generated on gold glyconanoparticles, which are recently considered promising therapeutic agents as they mimic a glycocalyx, is investigated. As model molecules, glucose and mannose (C2 epimer) as monosaccharides and lactose and maltose (galactose and glucose as free units, C4 epimer) as disaccharides were chosen to monitor the cellular response in A549, BEAS-2b, and MDA-MB-231 cells through cellular uptake, cytotoxicity, and cell cycle progression. The three cell lines gave various and remarkable cellular responses to the same subtle -OH differences on gold glyconanoparticles, and it is determined that not only -OH orientation differences but also the number of saccharides on gold glyconanoparticles affect the cellular response. It was shown that mannose (C2 epimer to glucose) was significant with the promise of being a therapeutic agent for lung cancer therapy, whereas the toxicological profile of MDA-MB-231 cells was affected by AuNPs-glucose the most. This study demonstrates that clearly small chemical alterations on a NP surface can result in a significant cellular response. It can be concluded that the -OH orientation at the second and fourth carbon of a carbohydrate ring has a critical role in designing and engineering novel gold glyconanoparticles (consisting of monolayer mono- or disaccharides) for a specific cancer therapy. Chemistry ; Colloidal gold ; Monosaccharide ; Galactose ; Glycocalyx ; Mannose ; Nanotechnology ; Biochemistry ; Biophysics ; Nanoparticle ; Biology ; Materials science Nanoparticle-Based Drug Delivery ; Gold and Silver Nanoparticles Synthesis and Applications ; Graphene and Nanomaterials Applications
Authors: Wenjia Xu | Shuaibin Li | Jin Ji | Hongyu Chen | Yuhua Feng
Source: Journal of Colloid and Interface Science (article, 2023-06-21)
Field: Materials Science — Materials Chemistry

Site-specific growth of gold nanoparticles on Bismuth Selenide hexagonal nanoplates Selenide ; Colloidal gold ; Materials science ; Nanotechnology ; Nanoparticle ; Heterojunction ; Bismuth ; Nanostructure ; Hexagonal crystal system ; Kinetics ; Chemical engineering ; Crystallography ; Chemistry ; Metallurgy ; Optoelectronics Quantum Dots Synthesis And Properties ; Gold and Silver Nanoparticles Synthesis and Applications ; Catalytic Processes in Materials Science
Authors: Larissa Gschwind | Carmen‐Simona Jordan
Source: Recycling (article, 2023-01-06)
Field: Materials Science — Polymers and Plastics

Upscaling of a Mechanochemical Devulcanization Process for EPDM Rubber Waste from a Batch to a Continuous System The present work is a comparative study of the effects of mechanical shear, temperature, and concentration of a chemical agent on the devulcanization process of post-industrial ethylene propylene diene (EPDM) rubber waste. Devulcanization was carried out in a heating press (no shear), an internal mixer (low shear), and a co-rotating twin screw extruder (high shear) at temperatures ranging from 100 to 200 °C. The efficiency of pure dibenzamido diphenyl disulfide (DBD) and a commercial devulcanizing agent, Struktol A89®, containing DBD were studied. Based on the results, the devulcanization process was upscaled from 40 g per batch to a continuous process with a capacity of 270 g/h. The parameters were fine-tuned regarding flow rate, screw speed, and temperature. Blends of virgin rubber (VR) and 25, 50, and 75 wt% recyclates were compared with blends of VR and 25, 50, and 75 wt% of untreated RWP. The quality of the recyclate was determined by rheometer tests, SEM images, TGA, and mechanical properties. The best results were obtained with 2 wt% DBD in the extruder with a temperature profile of 120 to 80 °C, 50 rpm, and 4.5 g per minute (gpm). The tensile strength and strain at break of the recyclate already met the requirements of DIN EN 681-1:2006 for the production of sealing systems. The compression set and Shore A hardness were restored by mixing recyclate with 25 wt% VR. Materials science ; Natural rubber ; Plastics extrusion ; Composite material ; Mooney viscosity ; Shore durometer ; Rheometer ; Compression set ; Mixing (physics) ; Ultimate tensile strength ; Vulcanization ; Shear rate ; Shear (geology) ; Viscosity ; Rheology ; Polymer Polymer Nanocomposites and Properties ; Polymer crystallization and properties ; biodegradable polymer synthesis and properties
Authors: Ana Maria Faísca Phillips | Armando J. L. Pombeiro
Source: Synthesis (article, 2023-01-12)
Field: Chemistry — Organic Chemistry

Catalytic Enantioselective Synthesis Enabled by Electrochemistry Abstract Catalytic enantioselective electrochemical synthesis has emerged in recent years as an efficient, clean, sustainable way to obtain chiral, non-racemic molecules. The difficulties in finding reaction conditions that are compatible with the delicate functional groups of many chiral ligands and organocatalysts has hampered the developments in this field. However, the fact that very minute differences in potential can be selected, allows for fine-tuning, so that very high chemoselectivities can be achieved, which is attracting much attention. Although still few in number compared to other areas of knowledge, the existing methods allow a variety of bond-forming reactions to be performed, and very high yields and ees can be achieved. The present review surveys the literature published in the last four years. 1 Introduction 2 Transition-Metal-Catalyzed Reactions 2.1 Alkylation by C–H Bond Functionalization: C(sp3)–C(sp3) Bond Formation 2.2 C(sp3)–C(sp2) Bond Formation 2.2.1 Alkene Functionalization by Cross-Coupling Reactions 2.2.2 Arylation by Cross-Coupling Reactions 2.3 Alkynylation: C(sp3)–C(sp) Bond Formation 2.4 Cross-Coupling Reactions for the Synthesis of Axially Chiral Biaryls 2.5 Cyanofunctionalization 2.6 Miscellaneous 3 Organocatalysis 4 Conclusions Enantioselective synthesis ; Chemistry ; Combinatorial chemistry ; Catalysis ; Alkylation ; Organocatalysis ; Alkene ; Alkynylation ; Electrochemistry ; Coupling reaction ; Organic synthesis ; Organic chemistry Axial and Atropisomeric Chirality Synthesis ; Catalytic C–H Functionalization Methods ; Radical Photochemical Reactions
Authors: D. Cabrera‐German | M. Martínez-Gil | Lorenzo Fuentes-Ríos | Z. Montiel‐González | Dalia Alejandra Mazón‐Montijo | M. Sotelo-Lerma
Source: ACS Omega (article, 2023-12-05)
Field: Materials Science — Materials Chemistry

Insights into the SILAR Processing of Cu<sub><i>x</i></sub>Zn<sub>1–<i>x</i></sub>S Thin Films via a Chemical, Structural, and Optoelectronic Assessment Careful analysis of the chemical state of Cu<sub><i>x</i></sub>Zn<sub>1-<i>x</i></sub>S thin films remains an underdeveloped topic although it is key to a better understanding of the phase transformations and the linking between structural and optoelectronic properties needed for tuning the performance of Cu<sub><i>x</i></sub>Zn<sub>1-<i>x</i></sub>S-based next-generation energy devices. Here, we propose a chemical formulation and formation mechanism, providing insights into the successive ionic layer adsorption and reaction (SILAR) processing of Cu<sub><i>x</i></sub>Zn<sub>1-<i>x</i></sub>S, in which the copper concentration directly affects the behavior of the optoelectronic properties. Via chemical, optoelectronic, and structural characterization, including quantitative X-ray photoelectron spectroscopy, we determine that the Cu<sub><i>x</i></sub>Zn<sub>1-<i>x</i></sub>S thin films at low copper concentration are composed of ZnS, metastable Cu<sub><i>x</i></sub>Zn<sub>1-<i>x</i></sub>S, and CuS, where the evidence suggests that a depth compositional gradient exists, which contrasts with homogeneous films reported in the literature. The oxidation states for copper and sulfide species indicate that the films grow following a formation mechanism governed by ionic exchange and diffusion processes. At high copper concentrations, the Cu<sub><i>x</i></sub>Zn<sub>1-<i>x</i></sub>S thin films are covellite CuS that grew on a ZnS seed layer. Hence, this work reiterates that future research related to fine-tuning the application of this material requires a careful analysis of the depth-profile compositional and structural characteristics that can enable high conductivity and transparency. Covellite ; X-ray photoelectron spectroscopy ; Thin film ; Copper ; Materials science ; Ionic bonding ; Copper sulfide ; Chemical state ; Metastability ; Nanotechnology ; Optoelectronics ; Chemical engineering ; Analytical Chemistry (journal) ; Chemistry ; Chalcopyrite ; Ion ; Metallurgy Quantum Dots Synthesis And Properties ; Chalcogenide Semiconductor Thin Films ; Copper-based nanomaterials and applications
Authors: Yuxin Liu | Rui Tan | Haibing Wu | Xue‐Hui Dong | Zhengbiao Zhang
Source: Science China Chemistry (article, 2023-11-29)
Field: Materials Science — Materials Chemistry

Quantitative understanding of phase segregation behaviors by precisely building discrete oligo-ester-b-oligo-olefin block copolymers Copolymer ; Olefin fiber ; Phase (matter) ; Materials science ; Block (permutation group theory) ; Surface energy ; Polymer chemistry ; Chemical engineering ; Chemistry ; Polymer ; Organic chemistry ; Composite material ; Mathematics ; Geometry Block Copolymer Self-Assembly ; Advanced Polymer Synthesis and Characterization ; Polymer Surface Interaction Studies
Authors: Thanyada Sukmanee | Michał Szuster | Aleksander Gorski | Marcin Hołdyński | Sylwester Gawinkowski
Source: Nanoscale Advances (article, 2023-01-01)
Field: Materials Science — Electronic, Optical and Magnetic Materials

Tunable-wavelength nanosecond laser tailoring of plasmon resonance spectra of gold nanoparticle colloids Metal nanoparticles have applications across a range of fields of science and industry. While there are numerous existing methods to facilitate their large-scale production, most face limitations, particularly in achieving reproducible processes and minimizing undesirable impurities. Common issues are varying particle sizes and aggregates with unfavorable spectral properties. Researchers are currently developing methods to separate or modify nanoparticle sizes and shapes post-synthesis and to eliminate impurities. One promising approach involves laser light irradiation and enables the changing of nanoparticle sizes and shapes while controlling crucial spectral parameters. In this work, we present a novel extension of this method by irradiating nanoparticle colloids with variable-wavelength nanosecond laser pulses on both sides of the extinction band. Our results demonstrate the use of gradual laser wavelength tuning to optimize the photothermal reshaping of gold nanorods and achieve precise control over the plasmon resonance band. By irradiating both sides of the plasmon resonance band, we execute a multistep tuning process, controlling the band's width and spectral position. A statistical analysis of SEM images reveals differences in the nanorod morphology when irradiated on the long- or short-wavelength side of the plasmon resonance band. The fine-tuning of plasmonic spectral properties is desirable for various applications, including the development of sensors and filters and the exploitation of the photothermal effect. The findings of this study can be extended to other plasmonic nanostructures. Surface plasmon resonance ; Materials science ; Plasmon ; Nanoparticle ; Colloidal gold ; Nanosecond ; Wavelength ; Laser ; Optoelectronics ; Resonance (particle physics) ; Spectral line ; Gold Colloid ; Colloid ; Optics ; Nanotechnology ; Chemistry ; Atomic physics ; Physics Gold and Silver Nanoparticles Synthesis and Applications ; Laser-Ablation Synthesis of Nanoparticles ; Nonlinear Optical Materials Studies
Authors: Yordanos T. Nibret | Ephriem Mengesha | Abi Tadesse Mengesha | Endale Teju | Tigabu Bekele | Zewdu Bezu Gemechu
Source: Journal of Molecular Structure (article, 2023-06-16)
Field: Materials Science — Materials Chemistry

Size-dependent solvatochromism of CdS nanoparticles: Experimental absorption and fluorescence analyses Solvatochromism ; Chemistry ; Nanoparticle ; Absorption (acoustics) ; Dipole ; Excited state ; Particle size ; Chemical physics ; Fluorescence ; Absorption spectroscopy ; Photochemistry ; Band gap ; Solvent effects ; Spectroscopy ; Solvent ; Molecular physics ; Nanotechnology ; Physical chemistry ; Atomic physics ; Materials science ; Optoelectronics ; Optics ; Organic chemistry ; Physics ; Quantum mechanics Quantum Dots Synthesis And Properties ; Gold and Silver Nanoparticles Synthesis and Applications ; Chalcogenide Semiconductor Thin Films
Authors: B. S. Ezdin | Sergei Vasiljev | D. A. Yatsenko | В.Е. Федоров | Mariia N. Ivanova | V. V. Kalyada | Yu. V. Pakharukov | F. K. Shabiev | A. Е. Зарвин
Source: Technical Physics (article, 2023-01-01)
Field: Materials Science — Materials Chemistry

Synthesis of Carbon Nanoparticles in a Compression Reactor in Atmosphere of Buffer Gases Physicochemical aspects of the gas-phase synthesis of nanopowders using a cyclic compression reactor are considered. Precursors (methane, ethylene, and acetylene) are compressed under conditions close to adiabatic ones in atmosphere of buffer monatomic gases (argon, helium, and neon). The effect of the pressure in the reactor and precursor/buffer gas volumetric ratio on the composition, morphology, and structure of carbon-containing particles (pyrolysis products) is studied. Complete pyrolysis is observed for all precursors but under different conditions. Thermal decomposition of methane, having the minimum enthalpy of formation, is observed in atmosphere with an argon content of 97.5% at a peak pressure of greater than 10 MPa. Helium shows limited possibilities for thermal relaxation under the conditions for fast reactions (<50 ms): only acetylene, having the maximum enthalpy of formation, is decomposed in the helium atmosphere. The solid reaction products represent black powders with a bulk density of 20–30 mg/cm3. The powders are studied using transmission and scanning electron microscopy, Raman scattering, and X-ray diffraction analysis. The particles represent either hollow or filled globular bulbous structures with a size of up to 100 nm. The X-ray diffraction analysis shows the presence of graphite-like crystallites with sizes of less than 10 nm in all samples. Raman analysis yields predominantly sp2 hybridization of carbon. The cyclic compression method provides wide opportunities for the pyrolysis of hydrocarbons aiming at the production of various carbon structures, which enables for the fine tuning in terms of the yield of carbon nanomaterials of the required morphology for practical use. Materials science ; Carbon fibers ; Buffer gas ; Chemical engineering ; Acetylene ; Analytical Chemistry (journal) ; Methane ; Graphite ; Argon ; Organic chemistry ; Composite material ; Chemistry ; Composite number Carbon Nanotubes in Composites ; Graphene research and applications ; Fullerene Chemistry and Applications
Authors: Zilu Wang | Haoyu Dong | Weichang Zhou | Zhihai Cheng | Shancai Wang
Source: Chinese Physics B (article, 2023-03-28)
Field: Materials Science — Materials Chemistry

Flat band in hole-doped transition metal dichalcogenide observed by angle-resolved photoemission spectroscopy Layered transition metal dichalcogenides (TMDCs) gained widespread attention because of their electron-correlation-related physics, such as charge density wave (CDW), superconductivity, etc. In this paper, we report the high-resolution angle-resolved photoemission spectroscopy (ARPES) studies on the electronic structure of Ti-doped 1 T -Ti x Ta 1– x S 2 with different doping levels. We observe a flat band that originates from the formation of the star of David super-cell at the x = 5% sample at the low temperature. With the increasing Ti doping levels, the flat band vanishes in the x = 8% sample due to the extra hole carrier. We also find the band shift and variation of the CDW gap caused by the Ti-doping. Meanwhile, the band folding positions and the CDW vector q CDW are intact. Our ARPES results suggest that the localized flat band and the correlation effect in the 1 T -TMDCs could be tuned by changing the filling factor through the doping electron or hole carriers. The Ti-doped 1 T -Ti x Ta 1– x S 2 provides a platform to fine-tune the electronic structure evolution and a new insight into the strongly correlated physics in the TMDC materials. Angle-resolved photoemission spectroscopy ; Doping ; Photoemission spectroscopy ; Condensed matter physics ; Materials science ; Superconductivity ; Electronic band structure ; Charge density wave ; Electronic structure ; Spectroscopy ; Band gap ; Electronic correlation ; Electron ; X-ray photoelectron spectroscopy ; Physics ; Nuclear magnetic resonance 2D Materials and Applications ; MXene and MAX Phase Materials ; Inorganic Chemistry and Materials
Authors: Renata Latypova | Tun Tun Nyo | Jukka Kömi | Sakari Pallaspuro
Source: Key engineering materials (article, 2023-12-05)
Field: Materials Science — Metals and Alloys

Hydrogen Embrittlement in as-Quenched Martensitic Steels - Application of Incremental Step Loading Technique with Novel Tuning-Fork Test Hydrogen embrittlement (HE) is a well-known issue, especially with ultrahigh-strength steels (UHSS). Various testing methods are utilised to study HE, but they typically require tensile test equipment, or are impractical due to limited stress control with standard geometries. We have developed a novel Tuning-fork test (TFT) to study HE susceptibility of steels with a new specimen geometry, which can be stressed accurately without tensile test equipment. The test method utilises in situ electrochemical hydrogen charging and constant displacement for stressing of the notched specimens by bending. Crack initiation and propagation are controlled with an isolated tensile stress region, and the failure process is monitored with a loadcell. TFT is a simple and fast testing method, which allows ranking of UHSSs, and to investigate, e.g., microstructural effects on susceptibility to HE and H-induced fracture processes. Here in this study, we present the state-of-the-art with the improved more precise second-generation TFT setup, which benefits from a more sensitive loadcell and a more stable fine-tuneable differential screw adjustment. We extend TFT to testing of martensitic steels with nominal hardness from 400 HBW to 600 HBW with the Incremental step loading technique (ISLT). The results show that TFT with ISLT is well applicable for ranking ultrahigh-strength steels based on their susceptibility to HE. Force-time data from ISLT can also be used for the determination of a material-specific threshold stress level, and the last step for the calculation of a crack initiation-time and time-to-fracture. However, the current manual operation of the loading screw can still limit maximum duration of a test. Materials science ; Hydrogen embrittlement ; Ultimate tensile strength ; Tensile testing ; Martensite ; Bending ; Stress (linguistics) ; Fracture (geology) ; Displacement (psychology) ; Metallurgy ; Composite material ; Corrosion ; Microstructure Hydrogen embrittlement and corrosion behaviors in metals ; Corrosion Behavior and Inhibition ; Non-Destructive Testing Techniques
Authors: Guangbiao Xiang | Jiangbin Zhang | Zhongyang Xing | Liangjin Huang | Zhiyong Pan | Hanwei Zhang | Xiaolin Wang | Weihong Hua
Source: Optical Materials Express (article, 2023-03-03)
Field: Materials Science — Ceramics and Composites

Reducing the refractive index by replacing an [AlPO<sub>4</sub>]° unit with [BPO<sub>4</sub>]° in fused silica The radiation resistance of rare-earth doped optical fibers is critical to applications in space-based environments such as laser radars, optical communications, and laser altimeters. Usually, doping various elements, such as aluminum (Al), phosphorus (P), and boron (B), is necessary to fine-tune the structural, electronic, and optical properties, but often results in degraded radiation resistance. Thus, achieving both excellent optical and radiation properties remain a challenge. Here, we theoretically investigate and compare the electronic, structural, and optical properties of [BPO 4 ]° and [AlPO 4 ]° units in silica glass. We prove that both [BPO 4 ]° and [AlPO 4 ]° units are stable in the SiO 2 matrix. As the radiation resistance of [SiO 4/2 ]° is excellent, inferring from the material's structure, the SiO 2 -BPO 4 and SiO 2 -AlPO 4 should have good radiation resistance. From the calculation, the SiO 2 -BPO 4 is structurally and electronically similar to the SiO 2 -AlPO 4 . Importantly, the refractive index of SiO 2 -BPO 4 is lower than SiO 2 -AlPO 4 , achieving refractive index tuning while maintaining its radiation resistance. Our results provide some guidance for the design of BPO 4 -based radiation-resistant active fibers. Materials science ; Refractive index ; Radiation resistance ; Radiation ; Laser ; Doping ; Optoelectronics ; Optical fiber ; Optics Glass properties and applications ; Solid State Laser Technologies ; Photonic Crystal and Fiber Optics