检索结果-南通市图书馆

Highly conductive and tough double-network hydrogels for smart electronics

SmartMat 2024年第2期5卷 54-66页

作者： Dong Zhang Yijing Tang xiong gong Yung Chang Jie Zheng Department of Chemical Biomolecularand Corrosion EngineeringThe University of AkronAkronOhioUSA School of Polymer Science and Polymer Engineering The University of AkronAkronOhioUSA R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian UniversityTaiwanChina

Development and understanding of highly mechanically robust and electronically conducting hydrogels are extremely important for ever-increasing energy-based applications.Conventional mixing/blending of conductive additives with hydrophilic polymer network prevents both high mechanical strength and electronic conductivity to be presented in polymer hydrogels.Here,we proposed a double-network(DN)engineering strategy to fabricate PVA/PPy DN hydrogels,consisting of a conductive PPy-PA network via in-situ ultrafast gelation and a tough PVA network via a subsequent freezing/thawing process.The resultant PVA/PPy hydrogels exhibited superior mechanical and electrochemical properties,including electrical conductivity of~6.8 S/m,mechanical strength of~0.39 MPa,and elastic moduli of~0.1 MPa.Upon further transformation of PVA/PPy hydrogels into supercapacitors,they demonstrated a high capacitance of~280.7 F/g and a cycle life of 2000 galvanostatic charge/discharge cycles with over 94.3%capacity retention at the current density of 2 mA/cm2 and even subzero temperatures of−20℃.Such enhanced mechanical performance and electronic conductivity of hydrogels are mainly stemmed from a synergistic combination of continuous electrically conductive PPy-PA network and the two interpenetrating DN structure.This in-situ gelation strategy is applicable to the integration of ionic-/electrical-conductive materials into DN hydrogels for smart-soft electronics,beyond the most commonly used PEDOT:PSS-based hydrogels.

关键词： conducting polymers double-network hydrogels smart electronics supercapacitors

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Recent progress in the all-solid-state flexible supercapacitors

引用

SmartMat 2022年第3期3卷 349-383页

作者： Yongrui Yang Tao Zhu Lening Shen Yanghe Liu Dong Zhang Bowen Zheng Keven gong Jie Zheng xiong gong School of Polymer Science and Polymer Engineering The University of AkronAkronOhioUSA Department of Chemical Biomolecular and Corrosion EngineeringThe University of AkronAkronOhioUSA Copley High School CopleyOhioUSA Western Reserve Academy HudsonOhioUSA

In the past few years,supercapacitors(SCs)have attracted great attention in both academic and industrial sectors due to their high energy storage efficiency,reliable stability,and eco-friendly process.Flexible solid-state SCs as one of the ongoing focuses for the development of wearable and portable electronics have become the most promising energy storage devices for the smart power system due to their high power density,fast electrochemical response,high efficiency on the charge-discharge process,and excellent electrochemical stability.In this study,the recent progress in the electrodes and electrolytes used for approaching high-performance of the all-solid-state flexible SCs is reviewed.We first introduce basic operational principles of various SCs.And then we overview the electrode materials including carbon materials,conducting polymers,transition metal oxides/chalcogenides/nitrides,MXenes,metal-organic frameworks,covalent-organic frameworks,and the polymer-based solid-state electrolytes in different systems.Afterward,we summarize recent progress in the development of the all-solid-state flexible SCs and outlook for future research directions.

关键词： electrode materials electrolyte materials flexible supercapacitors solid-state supercapacitors

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Organic field-effect optical waveguides: a new break-through all organic optoelectronics

引用

Science China Chemistry 2019年第3期62卷 293-294页

作者： xiong gong College of Polymer Science and Polymer Engineering The University of Akron

Optical waveguide, a physical structure that guides electromagnetic waves in the optical spectrum, is the key elements of photonic devices that perform guiding, coupling, switching, splitting, multiplexing and demultiplexing of optical signals [1]. In general, an optical waveguide is tuned by electrical field through a two-terminal diode [1]. Such integration was widely used in current photonic devices, but restricts its potentials in tiny optical chips for bio/medical and space applications [2].

关键词： Optical physical structure electromagnetic

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Low-dimensional perovskite materials and their optoelectronics

引用

InfoMat 2021年第10期3卷 1039-1069页

作者： Tao Zhu xiong gong School of Polymer Science and Polymer Engineering College of Engineering and Polymer ScienceThe University of AkronAkronOhioUSA

Three-dimensional(3D)organic-inorganic metal halide perovskite materials possess great potential applications for approaching efficient optoelectronics due to the unique optoelectronic properties of perovskite materials and costeffective manufacturing possibilities of optoelectronics.However,the scientific and technical challenges of 3D perovskite materials were their inferior long-term stability,which hampered their practical applications.The lowdimensional perovskite materials composed of alternating organic and inorganic layers are one of the most credible paths toward stable perovskite photovoltaics and optoelectronics.In this short review,we first present a discussion of the crystal structure and nontrivial optoelectronic properties of the low-dimensional halide perovskites.The synthetic methods for the preparation of the low-dimensional halide perovskites are reviewed.After that,we focus on the recent development of perovskite photovoltaics,light-emitting diodes,and lasers by the low-dimensional halide perovskites.Finally,we outline the challenges of the low-dimensional halide perovskites and their applications.

关键词： lasers light emitting diodes low-dimensional perovskite photodetectors solar cells

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Employing a random forest model to forecast the likelihood of coronary artery lesions in Kawasaki disease: a study centered on four biomarkers

引用

Medical Data Mining 2024年第3期7卷 1-7页

作者： Chu-xiong gong Yue-Wen Li Ya-Min Li Zi-Yu Wang Hui-Qing Gao Xiao-Mei Liu Department of Infectious Diseases Children’s Hospital Affiliated of Kunming Medical UniversityKunming Children’s HospitalKunming 650228China Department of Rehabilitation and Palliative Medicine The Third Affiliated Hospital of Kunming Medical UniversityKunming 650000China

Background:Kawasaki disease is an acute immune vasculitis,which is more common in children under 5 years old.Kawasaki disease mainly affects the cardiovascular system,especially the coronary arteries.Once coronary artery damage occurs,it can significantly impact the patient’s prognosis.Therefore,in some countries and regions,Kawasaki disease has become a common acquired heart disease.Methods:First,univariate analysis was conducted on each predictive factor.Then,Least Absolute Shrinkage and Selection Operator and random forest algorithms were used to screen all predictive factors,and the prediction model was evaluated using receiver operating characteristic curve,calibration curve,and Decision Curve Analysis.Results:This study,based on data from 228 Kawasaki disease patients,utilized a random forest model to identify four predictive factors:white blood cell count,creatine kinase isoenzyme MB,albumin,and neutrophil count.These factors were used to construct a prediction model,which achieved an area under the curve of 0.743.Conclusions:We developed a forest plot based on white blood cell count,creatine kinase isoenzyme MB,albumin,and neutrophil count to effectively predict the occurrence of coronary artery lesions in Kawasaki disease.

关键词： Kawasaki disease coronary artery lesions nomogram machine learning

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Development of a radical polymerization algorithm for molecular dynamics simulations of antifreezing hydrogels with double-network structures

引用

npj Computational Materials 2023年第1期9卷 204-213页

作者： Yonglan Liu Dong Zhang Yijing Tang xiong gong Jie Zheng Department of Chemical Biomolecularand Corrosion EngineeringThe University of AkronAkronOHUSA School of Polymer Science and Polymer Engineering The University of AkronAkronOHUSA

The development and understanding of antifreezing hydrogels are crucial both in principle and practice for the design and delivery of new materials.The current antifreezing mechanisms in hydrogels are almost exclusively derived from their incorporation of antifreezing additives,rather than from the inherent properties of the polymers themselves.Moreover,developing a computational model for the independent yet interconnected double-network(DN)structures in hydrogels has proven to be an exceptionally difficult task.Here,we develop a multiscale simulation platform,integrating‘random walk reactive polymerization’(RWRP)with molecular dynamics(MD)simulations,to computationally construct a physically-chemically linked PVA/PHEAA DN hydrogels from monomers that mimic a radical polymerization and to investigate water structures,dynamics,and interactions confined in PVA/PHEAA hydrogels with various water contents and temperatures,aiming to uncover antifreezing mechanism at atomic levels.Collective simulation results indicate that the antifreezing property of PVA/PHEAA hydrogels arises from a combination of intrinsic,strong water-binding networks and crosslinkers and tightly crosslinked and interpenetrating double-network structures,both of which enhance polymer-water interactions for competitively inhibiting ice nucleation and growth.These computational findings provide atomic-level insights into the interplay between polymers and water molecules in hydrogels,which may determine their resistance to freezing.

关键词： freezing polymerization hydrogel

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bulk heterojunction perovskite solar cells incorporated with solution-processed TiOx nanoparticles as the electron acceptors

引用

Chinese Chemical Letters 2020年第9期31卷 2249-2253页

作者： Tao Zhu Yongrui Yang Suyuan Zhou Xiang Yao Lei Liu Wenping Hu xiong gong Department of Polymer Engineering College of Polymer Science and Polymer EngineeringThe University of AkronAkronOH 44325United States Institute of Molecular Plus Tianjin Key Laboratory of Molecular Optoelectronic SciencesSchool of ScienceTianjin University and Collaborative Innovation Centre of Chemical Science and EngineeringTianjin 300072China

In the past ten years,perovskite solar cells were rapidly developed,but the intrinsic unbalanced charge carrier diffusion lengths within perovskite materials were not fully addressed by either a planar heterojunction or meso-superstructured perovskite solar cells.In this study,we report bulk heterojunction perovskite solar cells,where perovskite materials CH3NH3PbI3 is blended with solution-processed n-type TiOx nanoparticles as the photoactive layer.Studies indicate that one-step solution-processed CH3NH3PbI3:TiOx bulk-heterojunction thin film possesses enhanced and balanced charge carrier mobilities,superior film morphology with enlarged crystal sizes,and suppressed trapinduced charge recombination.Thus,bulk heterojunction perovskite solar cells by CH3NH3PbI3 mixed with 5 wt% of TiOx,which is processed by one-step method rather than typical two-step method,show a short-circuit current density of 20.93 mA/cm2,an open-circuit voltage of 0.90 V,a fill factor of 80% and with a corresponding power conversion efficiency of 14.91%,which is more than 30% enhancement as compared with that of perovskite solar cells with a planar heterojunction device structure.Moreover,bulk heterojunction perovskite solar cells possess enhanced device stability.All these results demonstrate that perovskite solar cells with a bulk heterojunction device structure are one of apparent approaches to boost device performance.

关键词： Bulk heterojunction Perovskite TiO_x Balanced mobilities Stability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Does the Dzungarian racerunner(Eremias dzungarica Orlova,Poyarkov,Chirikova,Nazarov,Munkhbaatar,Munkhbayar&Terbish,2017)occur in China?Species delimitation and identification with DNA barcoding and morphometric analyses

引用

Zoological Research 2021年第3期42卷 287-293页

作者： Jin-Long Liu Tatjana N.Dujsebayeva Marina A.Chirikova xiong gong Da-Jiang Li Xian-Guang Guo Chengdu Institute of Biology Chinese Academy of SciencesChengdu 610041China Institute of Zoology of Republic of Kazakhstan Almaty 050060Kazakhstan

The Eremias multiocellata-przewalskii species complex is a viviparous group in the genus Eremias,and a well-known representative of taxonomically complicated taxa.Within this complex,a new species-E.dzungarica(Orlova et al.,2017)-has been described recently from western Mongolia and eastern Kazakhstan,with an apparent distribution gap in northwestern China.In this study,we used an integrative taxonomic framework to address whether E.dzungarica indeed occurs in China.Thirty specimens previously classified as E.multiocellata were collected in eastern Kazakhstan and the adjacent Altay region in China.The cytochrome c oxidase I(COI)barcodes were sequenced and compiled with those from Orlova et al.(2017)and analyzed with the standard and diverse barcoding techniques.

关键词： China. eastern northwestern

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inverted polymer solar cells with Zn_2SnO_4 nanoparticles as the electron extraction layer

引用

Chinese Chemical Letters 2017年第8期28卷 1755-1759页

作者： Xiao-Juan Huang Xiang Yao Wen-Zhan Xu Kai Wang Fei Huang xiong gong Yong Cao Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Department of Polymer Engineering College of Polymer Science and Polymer Engineering The University of Akron

In this study, we report narrow-size distribution Zn_2SnO_4（ZSO） nanoparticles, which are produced by low-temperature solution-processed used as the electron extraction layer（EEL） in the inverted polymer solar cells（i-PSCs）. Moreover, poly[（9,9-bis（30-（N,N-dimethylamino）propyl）-2,7-fluorene）-alt-2,7-（9,9-dioctylfluorene）]（PFN） is used to modify the surface properties of ZSO thin film. By using the ZSO NPs/PFN as the EEL, the i-PSCs fabricated by poly[4,8-bis（2-ethylhexyloxyl）benzo[1,2-b：4,5-b0] dithio-phene-2,6-diyl-altethylhexyl-3-fluorothithieno [3,4-b]thiophene-2-carboxylate-4,6-diyl]（PTB7） blended with（6,6）-phenyl-C_（71）-butyric acid methylester（PC_（71）BM） bulk heterojunction（BHJ） composite, exhibits a power conversion efficiency（PCE） of 8.44%, which is nearly 10% enhancement as compared with that of7.75% observed from the i-PSCs by PTB7：PC_（71）BM BHJ composite using the ZnO/PFN EEL. The enhanced PCE is originated from improved interfacial contact between the EEL with BHJ active layer and good energy level alignment between BHJ active layer and the EEL. Our results indicate that we provide a simple way to boost efficiency of i-PSCs.

关键词： Electron transport layer Zn_2SnO_4 nanoparticles Bulk heterojunction Power conversion efficiency Inverted polymer solar cells

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

江苏河网区地表水沉积物中OCPs的赋存特征及风险

引用

中国环境科学 2024年第2期44卷 923-931页

作者：韦皓元林贵英姚晓龙李建平王苏红龚雄虎蔡永久张路赵中华湖北师范大学城市与环境学院湖北黄石435002 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室江苏南京210008 扬州市城市河道管理处江苏扬州225000

选取我国平原河网典型区域—江苏省内重点湖泊、水库及河流等为研究对象,系统调查江苏省地表水环境沉积物中有机氯农药(OCPs)的残留现状,解析区域空间分布特征和来源并评估其生态风险.结果表明,目标区域湖泊、水库及河流表层沉积物中20... 详细信息

选取我国平原河网典型区域—江苏省内重点湖泊、水库及河流等为研究对象,系统调查江苏省地表水环境沉积物中有机氯农药(OCPs)的残留现状,解析区域空间分布特征和来源并评估其生态风险.结果表明,目标区域湖泊、水库及河流表层沉积物中20种OCPs化合物检出率为100%,残留范围为0.41~10.62ng/g dw(平均值为3.14ng/g dw).与国内其它流域相比,江苏省地表水环境表层沉积物中OCPs的污染负荷整体处于较低水平.OCPs单体化合物特征比值溯源结果显示,江苏省表层沉积物中的OCPs主要来源于历史残留.运用风险熵值法对江苏省表层沉积物OCPs进行生态风险评估,结果显示环氧七氯是主要的生态风险因子,其次为α-硫丹和异狄氏剂.联合生态风险评价表明太湖梅梁湾湖区处于高风险,不同水体类型沉积物OCPs风险水平呈现为湖泊高于河流、河流高于水库的整体趋势.在国家加强新污染物治理的背景下,OCPs等传统持久性有机污染物POPs同样需要持续关注,支撑流域水环境复合污染治理和风险防范.

关键词：平原河网地表水沉积物有机氯农药(OCPs) 风险评估

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：