检索结果-内蒙古大学图书馆

Two-dimensional RGO-bridge S-scheme phosphorus-doped g-C_(3)N_(4)/Bi_(5)O_(7)Ivan der Waals heterojunctions for efficient visible-light photocatalytic treatment of real pharmaceutical wastewater

引用

science China(Technological sciences) 2023年第10期66卷 3011-3024页

作者： WANG ZhenZhou XU XiWei DENG Fang DIONYSIOU Dionysios D LI XiBao PENG JunLong LUO XuBiao ZOU JianPing LUO ShengLian National-Local Joint Engineering Research Center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering(DChEE)University of CincinnatiCincinnati 45221-0012USA

The design of van der Waals heterojunctions with S-scheme charge transfer pathway is expected to be an effective strategy for improvement of photocatalytic ***,two-dimensional(2D)phosphorus-doped g-C_(3)N_(4)/Bi_(5)O_(7)Ivan der Waals heterojunctions with reduced graphene oxide as electron bridge(PCN/RGO/Bi_(5O)_(7)I)were successfully synthesized via hydrothermal *** van der Waals interaction endowed 2D PCN/RGO/Bi_(5O)_(7)I with intimate contact interface,lattice match,tunable band structure,and internal electric field,which efficiently promoted interfacial charge separation and enhanced redox ability of photogenerated charge *** a result,the S-scheme PCN/RGO/Bi_5O_7I van der Waals heterojunctions exhibited superior photocatalytic performance in ciprofloxacin degradation and real pharmaceutical wastewater *** optimized 12%PCN/RGO/Bi_5O_7I displayed the highest photocatalytic activity with 92%removal of ***,the COD removal efficiency and extent of mineralization of real pharmaceutical wastewater reached 66.9%and 59.8%,respectively,and the biodegradability of pharmaceutical wastewater was significantly *** photocatalytic mechanism of the S-scheme PCN/RGO/Bi_(5)O_(7)I van der Waals heterojunctions based on the analysis of reactive species,work function,and internal electric field was *** study provides fresh insights into plausible design of S-scheme van der Waals heterojunction to enhance photocatalytic redox ability.

关键词： S-scheme heterojunction van der Waals heterostructure photocatalytic degradation ciprofloxacin energy consumption

来源：评论

学校读者我要写书评

暂无评论

Telechelic Triblock Poly(α-Amino Acid)-Poly(Tetrahydrofuran)-Poly(α-Amino Acid)Copolymers:Chain-End Transformation,Polymerization and pH-Responsive Hydrolysis

引用

Chinese Journal of Chemistry 2021年第10期39卷 2852-2856页

作者： Peng Zhou Zixian Li Yanzhi Lu Jie Kong Jun Ling MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhouZhejiang310027 China Shaanxi Key Laboratory of Macromoleculor Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnicol UniversityXi'onZhejiang 710072China

Main observation and conclusion Block copolymers not only combine properties of different segments but also generate new application ***(α-amino acid)-b-poly(tetrahydrofuran)-b-poly(α-amino acid)(PAA-PTHF-PAA)is one of the *** this contribution,di-hydroxyl-ended HO-PTHF-OH is transferred into di-oxyamino-ended H2NO-PTHF-ONH2 quantitatively,which is used as a macroinitiator to polymerize sarcosine N-thiocarboxyanhydride(Sar-NTA)and N-phenyoxycarbonyl N-ε-carbobenzyloxy-D-lysine(ZDL-NPC).Well-defined triblock PAA-NHO-PTHF-ONH-PAA is produced with high molecular weight(up to 25.3 kg/mol)and narrow *** amphiphilic PSar-NHO-PTHF-ONH-PSar(STS)self-assembles into micelles with uniform diameters of 30—40 nm according to *** to oxygen amide groups inside the backbone of these copolymers,the polyether-poly(amino acid)s block copolymers are cleavable under an acidic environment and therefore have potential applications in smart biomedicine and engineering.

关键词： End group transformation Block copolymers Amino acid Peptides Peptoids

来源：评论

学校读者我要写书评

暂无评论

Control of thermoresponsive property of urea end-functionalized poly(n-isopropylacrylamide) based on the ydrogen bond-assisted self-assembly in water

引用

Journal of Polymer science, Part A: Polymer Chemistry 2009年第22期47卷 6259-6268页

作者： Fuchise, Keita Kakuchi, Ryohei Lin, Sung-Tso Sakai, Ryosuke Sato, Shin-Ichiro Satoh, Toshifumi Chen, Wen-Chang Kakuchi, Toyoji Division of Biotechnology and Macromolecular Chemistry Graduate School of Engineering Hokkaido University Sapporo 060-8628 Japan Institute of Polymer Science and Engineering National Taiwan University Taipei 10617 Taiwan Department of Chemical Engineering National Taiwan University Taipei 10617 Taiwan

precise synthesis and variation in the thermoresponsive property based on the supramolecular assembly of a novel urea end-functionalized poly(N-isopropylacrylamide) (PNIPAM) were studied. A series of PNIPAMs with different diphenylurea groups at the chain end (XAPhANHACOANHAPhAtrzAPNIPAM: X = H, OCH3, CH3 , NO2 , Cl, and CF3) were synthesized by using a combination of the atom transfer radical polymerization and the copper(I)-catalyzed azide-alkyne cycloaddition. The cloud point of the obtained polymers depended on the hydrogen-bonding ability of the introduced urea group. The 1H NMR measurement suggested that the obtained PNIPAM assembled in water via the intermolecular hydrogen bonding by the terminal urea group. From the dynamic light scattering and transmission electron microscopy measurements, the aggregated nanoparticles of the resulting polymer were directly observed in water at a temperature below its cloud point. The hydrogen-bonding property of the chain end urea group was concluded to be involved in the aggregation of the PNIPAM in water, leading to the variation in its cloud point. © 2009 Wiley Periodicals, Inc.

关键词： Self assembly

来源：评论

学校读者我要写书评

暂无评论

Synthesis, thermomorphic characteristics, and fluorescent properties of poly[2,7-(9,9-dihexylfluorene)]-block-poly(N-isopropylacrylamide) -block-poly(N-hydroxyethylacrylamide) rod-coil-coil triblock copolymers

引用

Soft Matter 2009年第19期5卷 3761-3770页

作者： Lin, Sung-Tso Fuchise, Keita Chen, Yougen Sakai, Ryosuke Satoh, Toshifumi Kakuchi, Toyoji Chen, Wen-Chang Institute of Polymer Science and Engineering National Taiwan University Taipei 10617 Taiwan Division of Biotechnology and Macromolecular Chemistry Graduate School of Engineering Hokkaido University Sapporo 060-8628 Japan Department of Chemical Engineering National Taiwan University Taipei 10617 Taiwan

New thermoresponsive conjugated rod-coil-coil triblock copolymers were successfully synthesized from terminal azido functionalized poly(N- isopropylacrylamide)-b-poly(N-hydroxyethylacrylamide) (PNIPAAm-b-PHEAA) and alkynyl functionalized polyfluorene (PF) via a click reaction. The azido functionalized PNIPAAm-b-PHEAA copolymers with different block ratio was prepared by atom transfer radical polymerization from an initiator bearing the azide group, whereas alkynyl functionalized PF was synthesized by Suzuki coupling reaction. The lower critical solution temperature (LCST) of the block copolymers increased with an enhanced hydrophilic PHEAA block ratio, since the longer PHEAA segment facilitated the copolymer chains to stretch at an elevated temperature. The micelles of PNIPAAm-b-PHEAA with different block ratio changed into spheres, aggregate spheres, vesicles, and wormlike micelles as the temperature was increased, due to the variation on the hydrophilic/hydrophobic characteristic of PNIPAAm. However, the micellar morphologies became worms, bundles of wormlike micelles, and hollow tubes in the triblock PF-b-PNIPAAm-b-PHEAA, which were probably induced by the π-π interaction among the fluorene segments. The variation of the micelle morphology with temperature was consistent from the results of transmission electron microscopy, atomic force microscopy, and dynamic light scattering. Also, the micelle morphologies of PF-b-PNIPAAm-b-PHEAA showed a thermoreversible property based on its LCST. The photoluminescence characteristics behaved as an on/off fluorescence indicator of temperature, showing an "on-off-on" profile at an elevated temperature in water at a higher block ratio of PNIPAAm and switching to "on-off" as the block ratio of PNIPAAm decreased. The present study suggests that the PF-b-PNIPAAm-b-PHEAA copolymers have tunable morphologies and could be potentially used as thermoresponsive sensory materials. © 2009 The Royal Society of Chemistry.

关键词： Block copolymers

来源：评论

学校读者我要写书评

暂无评论

Effects of Processing Parameters on Mechanical Properties and Structure of Banana Fiber-Reinforced Composites

引用

Journal of Renewable Materials 2018年第6期6卷 662-670页

作者： Dan-Thuy Van-Pham Minh Tri Nguyen Chanh-Nghiem Nguyen Thi Truc Duyen Le Thi Yen Nhu Pham Khai Thinh Nguyen Yukihiro Nishikawa Qui Tran-Cong-Miyata Department of Chemical Engineering Can Tho UniversityCan Tho CityViet Nam Department of Automation Technology Can Tho UniversityCan Tho CityViet Nam Department of Macromolecular Science and Engineering Graduate School of Science and TechnologyKyoto Institute of TechnologyMatsugasakiSakyo-kuKyoto 606-8585Japan

The mechanical properties of unidirectional natural fiber-reinforced composites are generally affected by several processing parameters during compression *** study investigates the effects of processing temperature,time,and pressure on the tensile and flexural properties of acrylonitrile butadiene styrene reinforced by banana fibers.X-ray CT imaging was employed to find the relationship between the mechanical properties and structure of the processed ***,the water absorption of composites was observed and the way in which the mechanical properties evolved after water absorption was *** tensile and flexural properties of the unidirectional banana fiber-reinforced composite were found to be inversely proportional to the *** addition,high-pressure compression molding might result in cracks and floating fibers that would significantly reduce its mechanical *** composite with the highest strength,smallest porosity and lowest water absorption was optimally prepared at T=170℃,t=20 min,and P=100 kg cm^-2.

关键词： Banana fiber composite compression molding porosity X-ray CT

来源：评论

学校读者我要写书评

暂无评论

Wrinkling modes of graphene oxide assembled on curved surfaces

引用

Nano Research 2023年第2期16卷 1801-1809页

作者： Kaiwen Li Zhanpo Han Lidan Wang Jiaqing Wang Chuanwei Zhang Jiahao Lin Shiyu Luo Li Peng Wenzhang Fang Yingjun Liu Ziliang Wu Yeqiang Tan Chao Gao Zhen Xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China State Key Laboratory of Bio-Fibers and Eco-Textiles Collaborative Innovation Center of Marine Biobased Fiber and Ecological Textile TechnologySchool of Materials Science and EngineeringQingdao UniversityQingdao 266071China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030000China

Assembling two-dimensional(2D)sheets into macroscopic three-dimensional(3D)forms has created a promising material family with rich *** wrinkles are intrinsic features of 2D sheets in their 3D ***,the precise wrinkling modulation optimizes the transition of outstanding properties of 2D sheets to expected performances of assembled materials and dominates their fabrication *** wrinkling evolution of 2D sheets assembling onto flat surfaces has been extensively understood,however,the wrinkling behaviors on the more generally curved surface still remain ***,we investigate the wrinkling behaviors of graphene oxide sheets assembled onto curved surfaces and reveal the selection rule of wrinkling modes that determined by the curvature mismatch between 2D sheets and target *** uncover that three wrinkling modes including isotropic cracked land,labyrinth,and anisotropic curtain phases,respectively emerge on flat,spherical,and cylindrical surfaces.A favorable description paradigm is offered to quantitatively measure the complex wrinkling patterns and assess the curvature mismatch constraint underlying the wrinkling mode *** research provides a general and quantitative description framework of wrinkling modulation of 2D materials such as high performance graphene fibers,and guides the precise fabrication of particles and functional coatings.

关键词： two-dimensional(2D)sheets three-dimensional(3D)assembles curved surfaces wrinkling modes selection curvature mismatch constraint wrinkling modulation

来源：评论

学校读者我要写书评

暂无评论

The distribution of subsurface microplastics in the ocean

引用

Nature 2025年第8061期641卷 51-61页

作者： Zhao, Shiye Kvale, Karin F. Zhu, Lixin Zettler, Erik R. Egger, Matthias Mincer, Tracy J. Amaral-Zettler, Linda A. Lebreton, Laurent Niemann, Helge Nakajima, Ryota Thiel, Martin Bos, Ryan P. Galgani, Luisa Stubbins, Aron Japan Agency for Marine-Earth Science and Technology Yokosuka Japan Aotearoa Blue Ocean Research Lower Hutt New Zealand State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai China Department of Marine and Environmental Sciences Northeastern University Boston MA United States NIOZ Royal Netherlands Institute for Sea Research Den Burg Netherlands The Ocean Cleanup Rotterdam Netherlands Empaqtify St Gallen Switzerland Harriet Wilkes Honors College Florida Atlantic University Boca Raton FL United States Department of Freshwater and Marine Ecology Institute for Biodiversity and Ecosystem Dynamics University of Amsterdam Amsterdam Netherlands Department of Earth Sciences Faculty of Geosciences Utrecht University Utrecht Netherlands Facultad Ciencias del Mar Universidad Catolica del Norte Coquimbo Chile MarineGEO Program Smithsonian Environmental Research Center Edgewater MD United States Centre for Ecology and Sustainable Management of Oceanic Island (ESMOI) Coquimbo Chile Department of Organismic and Evolutionary Biology Harvard University Cambridge MA United States Department of Biotechnology Chemistry and Pharmacy University of Siena Siena Italy National Biodiversity Future Center (NBFC) Palermo Italy Department of Chemistry and Chemical Biology Northeastern University Boston MA United States Department of Civil and Environmental Engineering Northeastern University Boston MA United States

Marine plastic pollution is a global issue, with microplastics (1 µm–5 mm) dominating the measured plastic count1,2. Although microplastics can be found throughout the oceanic water column3,4, most studies colle...

Marine plastic pollution is a global issue, with microplastics (1 µm–5 mm) dominating the measured plastic count^1,2. Although microplastics can be found throughout the oceanic water column^3,4, most studies collect microplastics from surface waters (less than about 50-cm depth) using net tows⁵. Consequently, our understanding of the microplastics distribution across ocean depths is more limited. Here we synthesize depth-profile data from 1,885 stations collected between 2014 and 2024 to provide insights into the distribution and potential transport mechanisms of subsurface (below about 50-cm depth, which is not usually sampled by traditional practices^3,6) microplastics throughout the oceanic water column. We find that the abundances of microplastics range from 10⁻⁴ to 10⁴ particles per cubic metre. Microplastic size affects their distribution;the abundance of small microplastics (1 µm to 100 µm) decreases gradually with depth, indicating a more even distribution and longer lifespan in the water column compared with larger microplastics (100 µm to 5,000 µm) that tend to concentrate at the stratified layers. Mid-gyre accumulation zones extend into the subsurface ocean but are concentrated in the top 100 m and predominantly consist of larger microplastics. Our analysis suggests that microplastics constitute a measurable fraction of the total particulate organic carbon, increasing from 0.1% at 30 m to 5% at 2,000 m. Although our study establishes a global benchmark, our findings underscore that the lack of standardization creates substantial uncertainties, making it challenging to advance our comprehension of the distribution of microplastics and its impact on the oceanic environment. © The Author(s) 2025.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Mini Review on Nanocarbon-Based 1D Macroscopic Fibers:Assembly Strategies and Mechanical Properties

引用

Nano-Micro Letters 2017年第4期9卷 175-192页

作者： Liang Kou Yingjun Liu Cheng Zhang Le Shao Zhanyuan Tian Zengshe Deng Chao Gao Shaanxi Coal and Chemical Technology Institute Co. Ltd MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University

Nanocarbon-based materials, such as carbon nanotubes(CNTs) and graphene have been attached much attention by scientific and industrial community. As two representative nanocarbon materials, one-dimensional CNTs and twodimensional graphene both possess remarkable mechanical properties. In the past years, a large amount of work have been done by using CNTs or graphene as building blocks for constructing novel, macroscopic, mechanically strong fibrous materials. In this review, we summarize the assembly approaches of CNT-based fibers and graphene-based fibers in chronological order, respectively. The mechanical performances of these fibrous materials are compared, and the critical influences on the mechanical properties are discussed. Personal perspectives on the fabrication methods of CNT-and graphene-based fibers are further presented.

关键词： One dimensional Macroscopic architectures Carbon nanotubes Graphene fibers Assembly strategies Mechanical performance

来源：评论

学校读者我要写书评

暂无评论

Nonlinear viscoelasticity of native and engineered ligament and tendon

引用

2010 Annual Conference on Experimental and Applied Mechanics

作者： Jinjin, Ma. Arruda, Ellen M. Department of Mechanical Engineering University of Michigan United States Department of Biomedical Engineering University of Michigan United States Macromolecular Science and Engineering Program University of Michigan United States

ISBN: (纸本)9781441994974

Ligaments and tendons are non-linear viscoelastic materials and their response functions are typically assessed using creep and stress relaxation tests. Non-linear viscoelastic models such as multiple Maxwell elements in parallel and the quasilinear viscoelastic model (QLV) used to capture the non-linear viscoelastic response of ligaments and tendons frequently employ multiple relaxation time constants determined from curve-fitting the entire available data set and generally lack a clear physiological relevance. Uniaxial load-unload tension tests on ligament and tendon also manifests the viscoelastic response and such experiments suggest that the bulk of the non-linearity in the response of these soft tissues is in the elasticity. We propose physiologically relevant nonlinear viscoelastic models in which the response of the main structural proteins in ligament and tendon (e.g. collagen and elastin) are described using non-linear elasticity. Our approach using a three-element, non-linear solid micromechanical model captures this viscoelastic response in load-unload, stress relaxation and creep with a limited number of physically meaningful parameters. Previous research also shows different viscoelastic responses between native tendon and ligaments. In our model, by varying the properties of the non-linear springs, we are able to capture the differences in the viscoelastic responses of ligaments verses tendon. We will demonstrate the capabilities of our model by comparing to the experimental results from testing native and engineered ligament and tendon. ©2010 Society for Experimental Mechanics Inc.

关键词： Tendons

来源：评论

学校读者我要写书评

暂无评论

Structural modification of carbon black for improving the dielectric performance of epoxy based composites

引用

Advanced Industrial and engineering Polymer Research 2018年第1期1卷 111-117页

作者： Wang, Xin Li, Zewei Chen, Zhiwu Zeng, Lanying Sun, Luyi School of Materials Science and Engineering South China University of Technology Guangzhou China Polymer Program Institute of Materials Science and Department of Chemical & Biomolecular Engineering University of Connecticut Storrs CT United States

To explore a feasible strategy for improving the dielectric properties of carbon black (CB)/epoxy composites, CB@TiO2 core-shell particles and CB-SiO2 hybrid particles were prepared and incorporated into epoxy. The microstructures of CB, CB@TiO2, and CB-SiO2 particles, as well as the dielectric properties of their epoxy-based composites were investigated. The results showed that the composites containing CB-SiO2 hybrid particles possessed a higher dielectric constant than the ones containing pristine CB. The dielectric constant of the composite with 20.0 vol% CB-SiO2 reached 52.68 (1 kHz), which was ca. 4 times greater than that of the one containing 20.0 vol% pristine CB. Meanwhile, the composites containing CB@TiO2 core-shell particles exhibited suppressed values of dielectric loss. The permittivity of the composite with 20.0 vol% CB@TiO2 reached 19.52 (1 kHz), while its dielectric loss remained low (0.047 at 1 kHz). These results indicated that the dielectric properties of epoxy composites could be enhanced with the introduction of modified fillers. © 2018 Kingfa SCI. & TECH. CO., LTD.

关键词： Carbon black

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：