jablonkagroup/rise_ai_scientists huggingface dataset:
Authors: Yi Shuang | Daisuke Ando | Yun‐Heub Song | Yuji Sutou
Source: Applied Physics Letters (article, 2024-02-05)
Field: Materials Science — Materials Chemistry

Direct observation of phase-change volume in contact resistance change memory using N-doped Cr2Ge2Te6 phase-change material As we strive for faster and denser nonvolatile memory, a two-terminal phase-change random access memory device has been developed to fulfill this pressing need. This device utilizes a phase-change material (PCM) that experiences reversible resistive switching. Our study delved into the resistive switching behavior in a nitrogen-doped Cr2Ge2Te6 (NCrGT) contact resistance change memory, which employs a T-shape cell. The results of our study were highly promising: NCrGT memory cells showed a remarkable 90% reduction in Reset energy compared to the traditional PCM Ge2Sb2Te5. This notable reduction is attributed to the smaller phase-change volume of NCrGT, which was fine-tuned by the contact property. Moreover, we found that the N dopant was robustly distributed in the CrGT matrix during switching. Furthermore, we directly observed the phase-change area of the T-shape cell using transmission electron microscopy and energy-dispersive x-ray spectroscopy. After 104 of switching, our findings revealed that failure within the cells was caused by atom migration. Phase-change memory ; Materials science ; Dopant ; Phase (matter) ; Doping ; Phase-change material ; Contact resistance ; Transmission electron microscopy ; Optoelectronics ; Resistive touchscreen ; Non-volatile memory ; Phase change ; Nanotechnology ; Chemistry ; Electrical engineering ; Engineering physics Phase-change materials and chalcogenides ; Advanced Memory and Neural Computing ; Transition Metal Oxide Nanomaterials
Authors: Jie Zhang | Nan Wu | Hong Guo | Zhongnan Xie | M. Sun | Hui Yang | Ximin Zhang | Yulin Liu | Xinbo He
Source: Journal of Materials Research and Technology (article, 2024-12-15)
Field: Materials Science — Materials Chemistry

Study on interface structure and thermal conductivity regulation of Cu–In composite thermal interface materials In foil has excellent heat dissipation performance as a commercially available thermal interface material for high power devices. In order to improve the heat transfer performance of In-based thermal interface materials, a composite thermal interface material with In as the matrix and Cu as the reinforcement was prepared in this research by hot press sintering. The Cu–In composite material's characteristic interfacial structure was examined through the use of transmission electron microscopy. Theoretical models were employed to determine the thermal conduction patterns across various CuIn phase interfaces. By fine-tuning the parameters of the hot press sintering process, we were able to regulate the CuIn phase interface layer's morphology. Results indicate that the Cu–In interface is bonded through a reactive interface, leading to the formation of the CuIn phase that is tightly atomically bonded with both In and Cu. The CuIn phase, when continuous, exhibits higher interfacial thermal conductivity as its thickness decreases. Practical fabrication considerations show that the CuIn phase interface transitions from discontinuous to continuous at a thickness of ∼0.91 μm. Therefore, a continuous CuIn phase interface layer of about 0.91 μm thick yields the highest thermal conductivity, reaching 122.25 Wm −1 K −1 , which is 1.4 times greater than that of pure In. This research presents innovative choices and strategic directions for advancing the field of high-thermal-conductivity interfacial materials. Materials science ; Interface (matter) ; Thermal conductivity ; Composite number ; Thermal ; Thermal grease ; Composite material ; Thermodynamics Thermal properties of materials ; Electronic Packaging and Soldering Technologies ; Heat Transfer and Optimization
Authors: Morteza Ghorbandoust | Mohammad Fasihi | Reza Norouzbeigi
Source: Scientific Reports (article, 2024-05-29)
Field: Materials Science — Biomaterials

Tuning pore size and density of rigid polylactic acid foams through thermally induced phase separation and optimization using response surface methodology Rigid polylactic acid (PLA) foams fabricated via thermally induced phase separation (TIPS) utilizing a ternary solution of PLA, Tetrahydrofuran (THF), and water. The PLA gels were stabilized mechanically by the substituting of the THF/water solvent mixture with ethanol as non-solvent and subsequently vacuum dried. A comprehensive characterization of PLA foams was achieved by Scanning Electron Microscopy (SEM), X-ray Diffractometry (XRD) and Brunauer-Emmett-Teller (BET) analyses. The BET area obtained in the PLA foam is up to 18.76 m<sup>2</sup>/g. The Response Surface Methodology (RSM) was utilized to assess the impacts of four independent variables (polymer concentration, solvent composition, quench temperature, and aging time) on the pore size and density of PLA foam. The experimental findings demonstrated that the fabrication parameters could be fine-tuned to govern the morphology of the pores, comprising their size and density. The optimal values of parameters for cell size were identified by RSM to be 8.96 (wt%), 91.60 (w/w), 5.50 °C, and 3.86 h for the optimum cell size of 37.96 µm (37.78 by Genetic Algorithm). Optimum density by RSM 88.88 mgr/cm<sup>3</sup> (88.38 mgr/cm<sup>3</sup> by Genetic Algorithm) was obtained at 5.00 (wt%), 89.33 (w/w), 14.40 °C and 2.65 h. Polylactic acid ; Materials science ; Response surface methodology ; Scanning electron microscope ; Ternary operation ; Solvent ; Phase (matter) ; Chemical engineering ; Tetrahydrofuran ; Polymer ; Analytical Chemistry (journal) ; Composite material ; Chromatography ; Chemistry ; Organic chemistry biodegradable polymer synthesis and properties ; Polymer composites and self-healing ; Polymer Foaming and Composites
Authors: Rui Shi | Yipeng Huang | Guihua Ruan | Zhengyi Chen | Yanqun Yang | Zhuqiang Wu
Source: Journal of Chromatography A (article, 2024-03-05)
Field: Chemistry — Analytical Chemistry

Controlled synthesis of sulfhydryl-dendritic mesoporous silica nanospheres for ultrafast extraction and sensitive analysis of organochlorine herbicides containing amide groups Adsorption ; Mesoporous silica ; Mesoporous material ; Silanol ; Amide ; Dendrimer ; Chemistry ; Dispersity ; Desorption ; Lone pair ; Chemical engineering ; Molecule ; Materials science ; Organic chemistry ; Catalysis Analytical chemistry methods development ; Analytical Chemistry and Chromatography ; Pesticide and Herbicide Environmental Studies
Authors: Lígia Costa | Alexandre F. Carvalho | Ricardo Silva-Carvalho | Ana Cristina Rodrigues | Fernando Dourado | Jonas Deuermeier | M.A. Neto | A.J.S. Fernandes | Miguel Gama | F.M. Costa
Source: Cellulose (article, 2024-08-28)
Field: Materials Science — Biomaterials

Laser-patterning bacterial nanocellulose for cell-controlled interaction Abstract The interfacial topography of biomaterials has been identified as a major biophysical regulator of cell behavior and function, a role played through the interplay with biochemical cues. In this work, we demonstrate the potential of laser as a versatile technology for the direct fine-tuning of the topography of Bacterial nanocellulose (BNC) with bioinspired topographies and micropatterns on a cell size scale. Two lasers were used, with different wavelengths—IR (CO 2 , 10600 nm) and UV (tripled Nd: YVO 4 , 355 nm) —attempting to reproduce the Pitcher-plant topography and to create cell-contact guidance patterns, respectively. Different topographies with parallel grooves featuring a 20–300 μm period were generated on the BNC surface with high fidelity and reliability of the generated microstructures, as demonstrated by 3D optical profilometry and scanning electron microscopy. Moreover, it was demonstrated by X-ray photoelectron spectroscopy that laser processing does not result in detectable chemical modification of BNC. The developed anisotropic microstructures can control cell behavior, particularly regarding morphology, alignment, and spatial distribution. Thus, this proof-of-concept study on the high-resolution laser patterning of BNC opens new perspectives for the development of cell-modulating laser-engineered BNC interfaces, scaffolds, and other advanced medical devices, which can potentially broaden the application of BNC in the biomedical field. Materials science ; Nanocellulose ; Laser ; Nanotechnology ; Microscopy ; Force spectroscopy ; Optics ; Atomic force microscopy ; Chemical engineering ; Cellulose Advanced Cellulose Research Studies ; 3D Printing in Biomedical Research ; Electrohydrodynamics and Fluid Dynamics
Authors: Yibing Fan | Jiayu Wen | Li Shi | Yingqing Dai
Source: Journal of Materials Science (article, 2024-03-17)
Field: Materials Science — Biomaterials

Engineering of smart nanostructured lipid carriers encapsulated in gold nanocomposites and camptothecin for synergistic photothermal and chemotherapy treatment of ovarian cancer Photothermal therapy ; Camptothecin ; Materials science ; Photothermal effect ; Nanotechnology ; Nanocomposite ; Drug delivery ; Nanorod ; HeLa ; Colloidal gold ; Biomedical engineering ; Nanoparticle ; In vitro ; Chemistry ; Medicine ; Biochemistry Nanoparticle-Based Drug Delivery ; Gold and Silver Nanoparticles Synthesis and Applications ; Nanoplatforms for cancer theranostics
Authors: Jiangwei Ni | Zhiwei Huang | Wen Chen | Qiqi Zhou | Xiaomin Wu | Huazhen Shen | Huawang Zhao | Guohua Jing
Source: Chemical Engineering Journal (article, 2024-01-18)
Field: Materials Science — Materials Chemistry

Unveiling platinum's electronic and dispersion impacts for enhanced benzene combustion: From nanoparticles to nanoclusters and single atoms Nanoclusters ; Benzene ; Platinum ; Adsorption ; Reactivity (psychology) ; Valence (chemistry) ; Catalysis ; Dispersion (optics) ; Nanoparticle ; Materials science ; Metal ; Valence electron ; Density functional theory ; Platinum nanoparticles ; Nanotechnology ; Chemistry ; Chemical engineering ; Physical chemistry ; Computational chemistry ; Electron ; Organic chemistry Catalytic Processes in Materials Science ; Catalysis and Oxidation Reactions ; Nanomaterials for catalytic reactions
Authors: Gurusamy Sivakumar | Akkarakkaran Thayyil Muhammed Munthasir | Pakkirisamy Thilagar | Srinivasan Natarajan
Source: Chemistry - A European Journal (article, 2024-12-17)
Field: Materials Science — Materials Chemistry

Towards White Light Emission Through Metal‐to‐Metal Charge Transfer (MMCT) Effect in Bi<sup>3+</sup> Activated Ca<sub>2</sub>YTi<sub>2‐m</sub>Zr<sub>m</sub>Ga<sub>3</sub>O<sub>12</sub> (0≤m≤2) Garnets Herein, we report the high-temperature solid-state synthesis and intriguing optical features of Bi<sup>3+</sup>/Ln<sup>3+</sup> doped Ca<sub>2</sub>YTi<sub>2</sub>Ga<sub>3</sub>O<sub>12</sub> (CYT). The optical properties of CYT were fine-tuned by judiciously substituting Zr<sup>4+</sup> ions at Ti<sup>4+</sup> sites and Bi<sup>3+</sup>, Ln<sup>3+</sup> ions at Y<sup>3+</sup> sites. All these compounds are crystallized in a cubic crystal system with an Ia-3d (no. 230) space group. The Bi<sup>3+</sup> doped systems showed a broad photoluminescence (PL) band in the yellow-orange region centered at ~552 nm from the metal-to-metal charge transfer state (MMCT). The yellow-orange emissive CYT:Bi<sub>x</sub> was co-doped with blue emissive Tm<sup>3+</sup> to obtain an excitation wavelength-dependent color tuneable white light phosphor CYT:Tm<sub>0.02</sub>Bi<sub>0.012</sub>. Substituting Zr<sup>4+</sup> ions in place of Ti<sup>4+</sup> ions in CYT gave rise to CYTZ (Ca<sub>2</sub>YTi<sub>2-m</sub>Zr<sub>m</sub>Ga<sub>3</sub>O<sub>12</sub>), which upon doping with Bi gave Ca<sub>2</sub>YZr<sub>2</sub>Ga<sub>3</sub>O<sub>12</sub>:Bi<sub>x</sub> (CYZ:Bi<sub>x</sub>) and they exhibit the <sup>3</sup>P<sub>0,1</sub>→<sup>1</sup>S<sub>0</sub> emission in the violet-indigo region ( λ<sub>em</sub>=395 nm; λ<sub>ex</sub>=315 nm). On co-doping CYTZ:Bix with Sm<sup>3+</sup> ions produced white light emissive Ca<sub>2</sub>YTi<sub>0.1</sub>Zr<sub>1.9</sub>Ga<sub>3</sub>O<sub>12</sub>:Bi<sup>3+</sup>; Sm<sup>3+</sup>, (CYTZ:Bi<sup>3+</sup>; Sm<sup>3+</sup>). CYT:Bix showed slower (microsecond) PL decay than the CYZ:Bix (nanosecond). The crystal structure, steady state, and time-resolved optical studies, and semiempirical calculations were employed to rationalize the observed optical features of these compounds. The optical features of CYT:Bi<sub>0.1</sub>, were explored for potential applications in secret writing. Doping ; Ion ; Phosphor ; Photoluminescence ; Metal ions in aqueous solution ; Microsecond ; Metal ; Chemistry ; Crystal structure ; Materials science ; Analytical Chemistry (journal) ; Photochemistry ; Crystallography ; Optoelectronics ; Optics ; Physics Luminescence Properties of Advanced Materials ; Perovskite Materials and Applications ; Photorefractive and Nonlinear Optics
Authors: Zenghui Lao | Yiming Tang | Xuewei Dong | Yuan Tan | Xuhua Li | Xianshi Liu | Le Li | Cong Guo | Guanghong Wei
Source: Nanoscale (article, 2024-01-01)
Field: Materials Science — Biomaterials

Elucidating the reversible and irreversible self-assembly mechanisms of low-complexity aromatic-rich kinked peptides and steric zipper peptides Many RNA-binding proteins such as fused-in sarcoma (FUS) can self-assemble into reversible liquid droplets and fibrils through the self-association of their low-complexity (LC) domains. Recent experiments have revealed that SYG-rich segments in the FUS LC domains play critical roles in the reversible self-assembly behaviors of FUS. These FUS LC segments alone can self-assemble into reversible kinked fibrils, which are markedly different from the canonical irreversible steric zipper β-sheet fibrils. However, the molecular determinants underlying the reversible and irreversible self-assembly are poorly understood. Herein we conducted extensive all-atom and coarse-grained molecular dynamics simulations of four representative hexapeptides: two low-complexity aromatic-rich kinked peptides from the amyotrophic lateral sclerosis-related FUS protein, FUS<sub>37-42</sub> (SYSGYS) and FUS<sub>54-59</sub> (SYSSYG); and two steric zipper peptides from Alzheimer's-associated Aβ and Tau proteins, Aβ<sub>16-21</sub> (KLVFFA) and Tau<sub>306-311</sub> (VQIVYK). We dissected their reversible and irreversible self-assembly dynamics, predicted their phase separation behaviors, and elucidated the underpinning molecular interactions. Our simulations showed that alternating stickers (Tyr) and spacers (Gly and Ser) in FUS<sub>37-42</sub> and FUS<sub>54-59</sub> facilitate the formation of highly dynamic coil-rich oligomers and lead to reversible self-assembly, while consecutive hydrophobic residues of LVFF in Aβ<sub>16-21</sub> and IVY in Tau<sub>306-311</sub> act as hydrophobic patches, favoring the formation of stable β-sheet-rich oligomers and driving the irreversible self-assembly. Intriguingly, we found that FUS<sub>37-42</sub> and FUS<sub>54-59</sub> peptides, possessing the same amino acid composition and the same number of sticker and spacer residues, display differential self-assembly propensities. This finding suggests that the self-assembly behaviors of FUS peptides are fine-tuned by the site-specific patterning of spacer residues (Ser and Gly). This study provides significant mechanistic insights into reversible and irreversible peptide self-assembly, which would be helpful for understanding the molecular mechanisms underlying the formation of biological liquid condensates and pathological solid amyloid fibrils. Zipper ; Steric effects ; Chemistry ; Self-assembly ; Stereochemistry ; Biophysics ; Organic chemistry ; Biology ; Computer science Supramolecular Self-Assembly in Materials ; Chemical Synthesis and Analysis ; Polydiacetylene-based materials and applications
Authors: Lu Gan | Ruxin Li | W. L. Zhong | Wenli Zhou | Liping Yu | Shixun Lian
Source: Journal of Alloys and Compounds (article, 2024-10-16)
Field: Materials Science — Materials Chemistry

Self-reducing induced Eu2+/Eu3+ dual-emitting glasses for anti-counterfeiting and optical thermometry Dual (grammatical number) ; Materials science ; Nanotechnology ; Optoelectronics Luminescence Properties of Advanced Materials ; Glass properties and applications ; Pigment Synthesis and Properties
Authors: Albert J. Zhai | Yüan Shen | Emily Y. Chen | Gloria X. Wang | Xinlei Wang | Sheng Wang | Kaiyu Guan | Shenlong Wang
Source:  (article, 2024-06-16)
Field: Materials Science — Materials Chemistry

Physical Property Understanding from Language-Embedded Feature Fields Can computers perceive the physical properties of objects solely through vision? Research in cognitive science and vision science has shown that humans excel at identifying materials and estimating their physical properties based purely on visual appearance. In this paper, we present a novel approach for dense prediction of the physical properties of objects using a collection of images. Inspired by how humans reason about physics through vision, we leverage large language models to propose candidate materials for each object. We then construct a language-embedded point cloud and estimate the physical properties of each 3D point using a zero-shot kernel regression approach. Our method is accurate, annotation-free, and applicable to any object in the open world. Experiments demonstrate the effectiveness of the proposed approach in various physical property reasoning tasks, such as estimating the mass of common objects, as well as other properties like friction and hardness. Code is available at https://ajzhai.github.io/NeRF2Physics. Property (philosophy) ; Computer science ; Feature (linguistics) ; Natural language processing ; Human–computer interaction ; Linguistics Machine Learning in Materials Science ; Image Processing and 3D Reconstruction ; Handwritten Text Recognition Techniques
Authors: Laoura K. Komodiki | Nikos Panagiotou | Hélène Serier‐Brault | Anastasios J. Tasiopoulos
Source: Journal of Materials Chemistry C (article, 2024-01-01)
Field: Chemistry — Inorganic Chemistry

Linker installation transformations in a 2-D rare earth MOF: increase of the dimensionality and turn on of the temperature sensing capability A new 2-D 8-connected rare earth (RE) MOF based on a hexanuclear (RE 3+ ) 6 SBU, the increase of the dimensionality through SCSC linker installation reactions and the turn-on of the temperature sensing capability upon these reactions are reported. Curse of dimensionality ; Materials science ; Linker ; Rare earth ; Lanthanide ; Turn (biochemistry) ; Metal-organic framework ; Nanotechnology ; Physical chemistry ; Nuclear magnetic resonance ; Computer science ; Metallurgy ; Organic chemistry ; Chemistry ; Physics Metal-Organic Frameworks: Synthesis and Applications ; Gas Sensing Nanomaterials and Sensors ; ZnO doping and properties
Authors: Rodrigo Cué-Sampedro | José Antonio Sánchez-Fernández
Source: Frontiers in Chemistry (review, 2024-11-05)
Field: Chemistry — Inorganic Chemistry

Supramolecular systems and their connection with metal–organic structures Supramolecular structures with specific applications are a pillar in several areas of science. Thus, from a contemporary point of view, there are several reasons to embrace a systematic order of the supramolecular concept itself. First, the structuring of a supramolecular material seems safer now than it did decades ago. Second, the interactions of metal-organic frameworks (MOFs) and supramolecular chemistry and, conversely, supramolecularity to assemble MOFs and create efficient complex systems in multiple cutting-edge applications are an image to be safeguarded. Third, perhaps we should simply limit ourselves to considering how researchers in these fields have attempted to correlate the notion of supramolecular systems by linking self-assembly considerations. In any case, these topics present advantages to optimize innovative geometries that are useful to highlight significant practical applications. This review covers a general introduction to MOFs and supramolecularity, the key unit of the study presented here, followed by a survey of recent advances in confined space chemistry, the relationships of MOFs with supramolecular structures, and the synthesis electrochemistry of MOFs and switchable MOFs to obtain a greater understanding of structure-property relationships. To conclude, some future perspectives on this promising and plausible field of science will be mentioned. Supramolecular chemistry ; Nanotechnology ; Metal-organic framework ; Structuring ; Supramolecular assembly ; Computer science ; Materials science ; Chemistry ; Organic chemistry ; Molecule ; Political science Metal-Organic Frameworks: Synthesis and Applications ; Magnetism in coordination complexes ; Supramolecular Self-Assembly in Materials
Authors: Lin Huang | Qing Wang | Peng Fu | Yuzhu Sun | Jun Xu | Duncan L. Browne | Jianhui Huang
Source: JACS Au (article, 2024-03-27)
Field: Chemistry — Organic Chemistry

Extended Quinolizinium-Fused Corannulene Derivatives: Synthesis and Properties Reported here is the design and synthesis of a novel class of extended quinolizinium-fused corannulene derivatives with curved geometry. These intriguing molecules were synthesized through a rationally designed synthetic strategy, utilizing double Skraup-Doebner-Von Miller quinoline synthesis and a rhodium-catalyzed C-H activation/annulation (CHAA) as the key steps. Single-crystal X-ray analysis revealed a bowl depth of 1.28-1.50 Å and a unique "windmill-like" shape packing of <b>12a(2PF</b><sub><b>6</b></sub><sup><b>-</b></sup><b>)</b> due to the curvature and incorporation of two aminium ions. All of the newly reported curved salts exhibit green to orange fluorescence with enhanced quantum yields (Φ<sub>f</sub> = 9-13%) and improved dispersibility compared to the pristine corannulene (Φ<sub>f</sub> = 1%). The reduced optical energy gap and lower energy frontier orbital found by doping extended corannulene systems with nitrogen cations was investigated by UV-vis, fluorescence, and theoretical calculations. Electrochemical measurements reveal a greater electron-accepting behavior compared with that of their pyridine analogues. The successful synthesis, isolation, and evaluation of these curved salts provide a fresh perspective and opportunity for the design of cationic nitrogen-doped curved aromatic hydrocarbon-based materials. Corannulene ; Chemistry ; Combinatorial chemistry ; Organic chemistry ; Molecule Synthesis and Properties of Aromatic Compounds ; Fullerene Chemistry and Applications ; Porphyrin and Phthalocyanine Chemistry