检索结果-内蒙古大学图书馆

When quantum dots meet blue phase liquid crystal elastomers:visualized full-color and mechanically-switchable circularly polarized luminescence

引用

Light(science & Applications) 2024年第6期13卷 1210-1220页

作者： Shan Li Yuqi Tang Qingyan Fan Ziyuan Li Xinfang Zhang Jingxia Wang Jinbao Guo Quan Li Key Laboratory of Carbon Fibers and Functional Polymers Ministry of Educationand College of Materials Science and EngineeringBeijing University of Chemical Technology100029BeijingChina Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast UniversityNanjing211189China Materials Science Graduate Program Kent State UniversityKentOH44242USA CAS Key Laboratory of Bio-Inspired Materials and Interfacial Sciences Technical Institute of Physics and ChemistryChinese Academy of Sciences100190BeijingChina

Polymer-based circularly polarized luminescence(CPL)materials with the advantage of diversified structure,easy fabrication,high thermal stability,and tunable properties have garnered considerable ***,adequate and precise tuning over CPL in polymer-based materials remains challenging due to the difficulty in regulating chiral ***,visualized full-color CPL is achieved by doping red,green,and blue quantum dots(QDs)into reconfigurable blue phase liquid crystal elastomers(BPLCEs).In contrast to the CPL signal observed in cholesteric liquid crystal elastomers(CLCEs),the chiral 3D cubic superstructure of BPLCEs induces an opposite CPL ***,this effect is entirely independent of photonic bandgaps(PBGs)and results in a high glum value,even without matching between PBGs and the emission bands of ***,the lattice structure of the BPLCEs can be reversibly switched via mechanical stretching force,inducing on-off switching of the CPL signals,and these variations can be further fixed using dynamic disulfide bonds in the ***,the smart polymer-based CPL systems using the BPLCEs for anti-counterfeiting and information encryption have been demonstrated,suggesting the great potential of the BPLCEs-based CPL active materials.

关键词： circular quantum crystal

来源：评论

学校读者我要写书评

暂无评论

Reuse of sodium–doped iridium oxide nanoparticles as a bio–stimulating electrode by a chemical and electrochemical recovery process

引用

Ceramics International 2024年第4期50卷 6220-6228页

作者： Tso, Kuang-Chih Chen, Chieh-Hsuan Chen, Po-Chun Li, Shao-Sian Chen, Jeng-Lung Ohta, Jun Wu, Pu-Wei Division of Materials Science Graduate School of Science and Technology Nara Institute of Science and Technology Nara630-0192 Japan Graduate Degree Program of Science and Technology of Accelerator Light Source National Yang Ming Chiao Tung University Hsinchu300 Taiwan Department of Materials Science and Engineering National Yang Ming Chiao Tung University Hsinchu300 Taiwan Institute of Materials Science and Engineering National Taipei University of Technology Taipei106 Taiwan National Synchrotron Radiation Research Center Hsinchu300 Taiwan

A sequential chlorination and electrochemical reduction process is demonstrated to convert Na–doped iridium oxide nanoparticles into useful IrIIICl63−(aq) serving as the precursor for the fabrication of bio–stimulating electrode. The Na–doped iridium oxide nanoparticles are treated in 35 wt% hydrochloric acid at 70 °C for 18 h to form IrIVCl62−(aq) with pH of 0.3, so the latter could be readily reduced to IrIIICl63−(aq) at a potentiostatic mode of 0.6 V (vs. SCE). The oxidation state and the nature of complexing ligands for the regenerated IrIIICl63− and IrIVCl62−, as well as commercially available IrIIICl63− are validated by X–ray Absorption Spectroscopy. UV–Vis profiles of regenerated IrIVCl62−(aq) are recorded and the absorbance at 487 nm signal is benchmarked against that of standard IrIVCl62−(aq) to obtain the effective regeneration ratio of 68.6%. X–ray diffraction patterns of Na–doped iridium oxide nanoparticles before and after the annealing treatment indicate the amorphous structure facilitates the chlorination step. The regenerated IrIIICl63− is reused to synthesize Na–doped iridium oxide thin film serving as a bio–stimulating electrode for implantable bio–electronics. The regenerated Na–doped iridium oxide thin film reveals a charge-storage capacity of 0.32 mC/cm2-nm and impressive stability that are comparable to those of fresh Na–doped iridium oxide thin film derived from commercially available IrIIICl63−. © 2023 Elsevier Ltd and Techna Group S.r.l.

关键词： Transition metal oxides

来源：评论

学校读者我要写书评

暂无评论

Two-dimensional multi-array formation of hepatocyte spheroids on a micro-fabricated PEG-brush surface

Two-dimensional multi-array formation of hepatocyte spheroid...

引用

Transactions - 7th World biomaterials Congress

作者： Otsuka, H. Satomi, T. Itadani-Harada, J. Nagasaki, Y. Horiike, Y. Kataoka, K. Biomaterials Center Natl. Inst. for Materials Science Tsukuba Ibaraki Japan Department of Materials Science Tokyo University of Science Noda Chiba Japan Dept. of Mat. Sci. and Engineering Graduate School of Engineering University of Tokyo Tokyo Japan

ISBN: (纸本)1877040193

The micropatterning of rat primary hepatocyte hetero-spheroids was prepared on microfabricated glass substrates coated with poly(ethylene glycol) (PEG) brushes. Co-cultivation of hepatocytes and endothelial cells was used to stabilize hepatocyte viability and liver-specific functions. Rat primary hepatocytes, suspended in a culture medium, were applied to the patterned dishes with cultured endothelial cells selectively located in the circular domains. Rat primary hepatocytes formed spheroids within 24-h only on the circular regions of existing endothelial cells, generating a two-dimensional (2D)-arrayed structure of the hepatocyte spheroids.

关键词： Cells

来源：评论

学校读者我要写书评

暂无评论

Construction of micro-patterned poly (ethylene glycol) brush surface for controlling protein and cell interactions

Construction of micro-patterned poly (ethylene glycol) brush...

引用

Transactions - 7th World biomaterials Congress

作者： Satomi, T. Otsuka, H. Nagasaki, Y. Horiike, Y. Kataoka, K. Biomaterials Center Natl. Inst. for Materials Science Tsukuba Ibaraki Japan Department of Materials Science Tokyo University of Science Noda Chiba Japan Dept. of Mat. Sci. and Engineering Graduate School of Engineering University of Tokyo Tokyo Japan

ISBN: (纸本)1877040193

The micro-patterned poly(ethylene glycol) (PEG) brush surface for controlling protein and cell interactions was constructed. PEGylated substrates with two-dimensional arrays of plasma-etched circular domains were prepared by coating of mercapto-functionalized (PEG) on Au surface, followed by plasma-etching through a metal mask pattern with circular holes. The micro-patterning of bovine articular chondrocytes or rat primary hepatocytes hetero-spheroids underlaid with human umbilical endothelial cells (HUVEC) was achieved. These arrayed spheroids are promising materials for tissue and cell-based biosensors (TBB and CBB) as well as tissue engineering technologies.

关键词： Polyethylene glycols

来源：评论

学校读者我要写书评

暂无评论

Low-Temperature Methanolysis of Polycarbonate over Solid Base Sodium Aluminate

引用

Langmuir 2024年第10期40卷 5338-5347页

作者： Krisbiantoro, Philip Anggo Sato, Miyu Lin, Tzu-Ming Chang, Yu-Chia Peng, Tzu-Yun Wu, Yun-Chih Liao, Weisheng Kamiya, Yuichi Otomo, Ryoichi Wu, Kevin C.-W. Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering College of Engineering National Taiwan University Taipei10617 Taiwan Graduate School of Environmental Science Hokkaido University Nishi 5 Kita 10 Sapporo060-0810 Japan Faculty of Environmental Earth Science Hokkaido University Nishi 5 Kita 10 Sapporo060-0810 Japan Center of Atomic Initiative for New Materials National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan320 Taiwan

Herein, a low-cost and readily available sodium aluminate (NaAlO2) was used as a solid base catalyst for the depolymerization of polycarbonate (PC) via methanolysis in the presence of tetrahydrofuran (THF) as a solvent. NaAlO2 was highly active for the reaction, and the performance was comparable to that of soluble strong base SrO and much higher than those of MgO and CaO. By the reaction over the catalyst, a highly pure and crystalline bisphenol A (BPA) was obtained. Among tested organic solvents, THF was the best in aiding PC methanolysis over NaAlO2 due to the polarity similar to PC according to Hansen solubility parameters (HSPs). At 60 °C, 98.1% PC conversion and 96.8% BPA yield were achieved within just 2 h. NaAlO2 was reusable without any severe catalyst deactivation in at least four runs. The mechanistic study revealed that the reaction proceeded via the methoxide pathway, with THF aiding the dissolution of PC. The reaction over NaAlO2 possessed a low apparent activation energy (Ea) of 75.1 kJ mol-1, which is the lowest ever reported so far for the reaction over solid catalysts. © 2024 The Authors. Published by American Chemical Society.

关键词： Sodium Aluminate

来源：评论

学校读者我要写书评

暂无评论

Bioplastics from orange processing waste and poly(lactic acid)

Future Foods

引用

Future Foods 2025年 11卷

作者： Laís T. Possari Marina S. de Paula George F. Nunes Iago A. Reis Marcos V. Basaglia Caio G. Otoni Sílvia H.P. Bettini Federal University of São Carlos (UFSCar) Graduate Program in Materials Science and Engineering (PPGCEM) São Carlos SP 13565-905 Brazil Federal University of São Carlos (UFSCar) Department of Materials Engineering (DEMa) São Carlos SP 13565-905 Brazil University of Campinas (UNICAMP) Institute of Chemistry Campinas SP 13083-862 Brazil

Bioplastics have the potential to mitigate the aggravating crisis of plastic pollution. Valorizing agri-food side streams for such a purpose is particularly beneficial as it valorizes massively produced waste, thus contributing to the shift towards circular and regenerative productive chains. In this work, citrus pulp (CP) obtained as a by-product from orange juice production was upcycled into thermoplastic compounds via extrusion-assisted plasticization with glycerol. Compounds with poly(lactic acid) (PLA) were then produced by extrusion melt blending. An experimental 2² factorial design with a central point was performed to evaluate their mechanical, thermal, and biodegradation behavior. The levels for the variables plasticized CP (PCP) and glycerol contents were 30 and 70 % for PCP, and 40 and 60 % for glycerol. Calorimetry showed that PCP increased PLA free volume and chain mobility. Still, the different fractions of PCP and glycerol did not alter the melting behavior of the compounds significantly. PCP led to a progressive toughening effect on PLA. Mass loss after 90 d of soil burial reached 53–64 % for the formulations containing 70 % PCP, and PLA chain scission was accelerated at 30 % PCP with 60 % glycerol, and 70 % PCP with 40 % glycerol. This work opens new pathways to citrus biomass valorization by exploring CP, a scarcely investigated residue, and a novel processing strategy. The produced compounds can be applied as bio-based semi-rigid packaging and utensils.

关键词： Biodegradable plastic PLA Biomass Food waste Upcycling Citrus sinensis

来源：评论

学校读者我要写书评

暂无评论

Thermomechanical Characterization of Hot Surface Ignition Device Using Phenomenological Heat Flux Model

引用

JOURNAL OF PROPULSION AND POWER 2022年第4期38卷 656-670页

作者： Kang, Sang-Guk Ryu, Je Ir Motily, Austen H. Numkiatsakul, Prapassorn Lee, Tonghun Kriven, Waltraud M. Kim, Kenneth S. Kweon, Chol-Bum M. U.S. Army Research Laboratory Aberdeen Proving Ground MD 21005 Aerospace Engineer Weapons and Materials Research Directorate Postdoctoral Fellow Computational and Information Sciences Directorate University of Illinois at Urbana-Champaign Urbana IL 61801 Graduate Student Department of Mechanical Science and Engineering. Student Member AIAA Graduate Student Department of Materials Science and Engineering Professor Department of Mechanical Science and Engineering. Associate Fellow AIAA Professor Department of Materials Science and Engineering Mechanical Engineer Computational and Information Sciences Directorate. Member AIAA Program Manager Computational and Information Sciences Directorate. Member AIAA.

Modern aircraft compression ignition engines that seek to achieve fuel-flexible operation require ignition-assisting devices to perform reliably. Many military propulsion systems, and unmanned aircraft in particular, can use hot surface energy addition to improve engine performance. An analysis of the thermomechanical stress behavior of hot surface ignition devices is therefore critical to ensure that they can satisfy new operational requirements. In this paper, a phenomenological heat-flux model is proposed to simulate heat generation inside a heating element. Two finite element analysis models are established using the proposed heat-flux model in order to characterize the transient thermomechanical behavior of an ignition assistant: a two-dimensional (2-D) axisymmetric model with an equivalent cylindrical heating element and a three-dimensional (3-D) solid model with realistic heating element geometry. The transient behavior of the ignition assistant is investigated at standard conditions by characterizing the temperature and thermal stress inside the device for various input voltages. The effect of the nonaxisymmetric heating element geometry on the temperature and thermal stress distribution is assessed. Furthermore, the 3-D ignition assistant model is used to analyze the thermomechanical behavior of an ignition device subjected to a combustion event inside a rapid compression machine. Multiple circumferential orientations of the heating element plane relative to the spray axis are investigated. Results demonstrate that the observed maximum principal stress depends significantly on heating element orientation.

关键词： Heat Flux Stress Distribution Heat Generation Unmanned Aerial Vehicle Propulsion System Surface Energy Adaptive Mesh Refinement Fuel Injection CFD Simulation Fracture Toughness

来源：评论

学校读者我要写书评

暂无评论

Catalytic surface modification of roll-milled poly(Ε-caprolactone) biaxially stretched to ultra-thin dimension

引用

materials science and engineering C 2007年第2期27卷 299-303页

作者： Foo, H.L. Taniguchi, A. Yu, H. Okano, T. Teoh, S.H. Graduate Programme in Bioengineering National University of Singapore Singapore Bionic Materials Technology Group Biomaterials Center National Institute for Materials Science Japan Department of Physiology National University of Singapore Singapore Institute of Biomedical Engineering Tokyo Women's Medical University Japan Department of Mechanical Engineering National University of Singapore Singapore

A novel roll-milling polymer processing technique along with biaxial stretching was used to fabricate 10 μm thick poly(Ε-caprolactone) films. A less invasive collagen surface modification was used, involving a reaction between corona-preactivated membranes and ferrous-containing acrylic acid solution at the low temperature of 42 °C. Successful modified films were characterized by Toluidine Blue O assay and X-ray photoelectron spectroscopy. Human umbilical vein endothelial cells also showed both higher proliferation rate and differentiated cobblestone morphology on these collagen-immobilized substrates. © 2006 Elsevier B.V. All rights reserved.

关键词： Collagen

来源：评论

学校读者我要写书评

暂无评论

Bending the Rule: Naphthobisthiadiazole-Based Terpolymers with Both High Solubility and Crystallinity for Organic Photovoltaics

引用

ACS Applied Polymer materials 2024年第5期6卷 2586-2593页

作者： Chou, Li-Hui Chen, Fengkun Nakano, Kyohei Yamanaka, Kodai Mikie, Tsubasa Saito, Masahiko Liu, Cheng-Liang Tajima, Keisuke Osaka, Itaru Department of Applied Chemistry Graduate School of Engineering Hiroshima University Hiroshima Higashi-Hiroshima739-8527 Japan Department of Chemical and Materials Engineering National Central University Taoyuan32001 Taiwan Saitama Wako351-0198 Japan Applied Chemistry Program Graduate School of Advanced Science and Engineering Hiroshima University Hiroshima Higashi-Hiroshima739-8527 Japan Department of Materials Science and Engineering National Taiwan University Taipei10617 Taiwan

Achieving a good balance between the crystallinity and solubility is of great importance in the design of π-conjugated polymers. Here, we synthesized a series of terpolymers in which small fractions of a planar V-shaped fused ring, triphenyleno[1,2-c:7,8-c′]bis([1,2,5]thiadiazole) (TPTz), are incorporated into the linear-shaped backbone of a highly crystalline polymer based on naphtho[1,2-c:5,6-c′]bis([1,2,5]thiadiazole) (NTz), PNTz4T. Due to the "bending" structure induced by the TPTz unit, the terpolymers had greatly improved solubility by about 5-9 times compared to the linear-shaped PNTz4T. In particular, the terpolymers preserved the crystallinity of PNTz4T to a considerable extent with a higher fraction of face-on oriented domains in films. As a result, the highly solution-processable terpolymers exhibited high photovoltaic performances and slightly outperformed PNTz4T. Our results indicate that the incorporation of a V-shaped unit into a linearly shaped polymer is a good strategy to develop π-conjugated polymers with high solubility and crystallinity. © 2024 American Chemical Society.

关键词： Solubility

来源：评论

学校读者我要写书评

暂无评论

Leveraging Molecular Interactions to Develop a Generalized Design Framework for Coamorphous Drug-Drug Mixtures Exhibiting Elevated Glass Transition Temperatures

引用

Molecular Pharmaceutics 2025年 2025 May 16页

作者： Yarlagadda, Dani Lakshman Kawakami, Kohsaku Samavedi, Satyavrata Department of Chemical Engineering Indian Institute of Technology Hyderabad IITH Main Road Near NH 65 Kandi Telangana Sangareddy 502285 India Research Center for Macromolecules and Biomaterials National Institute for Materials Science 1-1 Namiki Ibaraki Tsukuba 305-0044 Japan Graduate School of Science and Technology University of Tsukuba 1-1-1 Tennodai Ibaraki Tsukuba 305-8577 Japan

Coamorphous mixtures (CAMs) prepared with two drugs have the potential to enhance the oral absorption of poorly soluble drugs and achieve combination therapy. From a practical standpoint, improving the glass transition temperature (T_g) of CAMs is desirable as it enhances stability and extends shelf life during storage. Toward the eventual goal of developing highly stable CAMs, this study establishes a generalized framework that systematically relates elevated T_g values of CAMs to intermolecular interactions based on specific functional groups. CAMs were prepared via quench-cooling using various combinations of indomethacin, ketoprofen, flurbiprofen, flufenamic acid, aripiprazole, bifonazole, and clotrimazole. CAMs prepared with drugs containing the COOH group exhibited significant positive deviations from the T_g values predicted by the Gordon-Taylor equation (i.e., ideal mixing behavior). COOH-associated hydrogen bonding was determined to be a key factor for T_g elevation, with synergistic contributions from π-π interactions and halogen bonding. In CAMs exhibiting the largest T_g deviations, contributions from ionic bonding were crucial, and were likely favored by differences in the pK_a values of the constituent drugs. Continuity in T_g as a function of varying molar ratios indicated that stoichiometric pairing had a relatively minor contribution, while a decrease in the width of the glass transition suggested enhancement of molecular cooperativity as a possible mechanism for CAM stabilization. In contrast, non-COOH hydrogen bonding, π-π interactions, and halogen bonding on their own did not result in any meaningful T_g deviations from theoretical predictions. Systematic correlations between T_g deviations and molecular interactions reported in this study can lead to generalized design rules for the development of stable CAMs. © 2025 American Chemical Society.

关键词： amorphous drug stability Coamorphous mixture glass transition temperature Gordon-Taylor equation molar ratio molecular cooperativity molecular interaction

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：