检索结果-内蒙古大学图书馆

Fluorine-containing polyimide nanofiber membranes for durable and anti-aging daytime radiative cooling

Journal of materials Science & Technology 2024年第12期179卷 166-173页

作者： Qiaoran Zhang Tiantian Xue Yang Lu Lei Ma Dingyi Yu Tianxi Liu Wei Fan Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Personal daytime radiative cooling(PDRC)materials have high sunlight reflection and high selective emis-sivity to outer space in the main atmospheric window,demonstrating huge potential in energy-saving for sustainable ***,polymer-based membranes for radiative cooling have been widely re-ported,due to their easy processing,low cost,and unique optical ***,the desired high sunlight reflectance of PDRC materials is easily dampened by environmental aging,high temperature,and ultraviolet(UV)irradiation,resulting in reduced cooling performance for most polymers,adverse to large-scale practical *** this work,we demonstrate a novel polyimide nanofiber(PINF)membrane with a fluorine-containing structure via typical electrospinning *** resultant PINF membrane exhibits high sunlight reflectance,UV resistance,and excellent thermal stability,rendering anti-aging day-time radiative *** sunlight reflectance of PINF membranes could maintain constant in the aging test for continuous 720 h under outdoor solar irradiation,exhibiting durable and long-term personal day-time radiative cooling performance.

关键词： Polyimide Nanofiber UV resistance Daytime radiative cooling

来源：评论

学校读者我要写书评

暂无评论

A Radiative-Cooling Hierarchical Aligned Porous Poly(vinylidene fluoride)Film by Freeze-Thaw-Promoted Nonsolvent-Induced Phase Separation

引用

Chinese Journal of Polymer Science 2024年第7期42卷 976-983,I0009页

作者： Yiting Zhang Jiahui Sun Yufeng Wang Yunchen Wu Chun Huang Chao Zhang Tianxi Liu Key Laboratory of Synthetic and Biological Colloids Ministry of Education School of Chemical and Material EngineeringJiangnan UniversityWuxi214122China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China

Passive daytime radiative cooling(PDRC)is an innovative and sustainable cooling technology that holds immense potential for addressing the energy *** the numerous reports on radiative coolers,the design of a straightforward,efficient,and readily producible system remains a ***,we present the development of a hierarchical aligned porous poly(vinylidene fluoride)(HAP-PVDF)film through a freeze-thaw-promoted nonsolvent-induced phase separation *** film features oriented microporous arrays in conjunction with random nanopores,enabling efficient radiative cooling performance under direct sunlight *** incorporation of both micro-and nano-pores in the HAP-PVDF film results in a remarkable solar reflectance of 97%and a sufficiently high infrared thermal emissivity of 96%,facilitating sub-environmental cooling at 18.3℃ on sunny days and 13.1℃ on cloudy ***,the HAP-PVDF film also exhibits exceptional flexibility and *** calculations further confirm a radiative cooling power of 94.8 W·m^(-2)under a solar intensity of 1000W·m^(-2),demonstrating a performance comparable to the majority of reported radiative coolers.

关键词： Daytime radiative cooling Hierarchical porosity PVDF porous film Thermal insulation Nonsolvent-induced phase separation

来源：评论

学校读者我要写书评

暂无评论

Ultralight and Anisotropic Heterocyclic Para-aramid Nanofiber/Reduced Graphene Oxide Composite Aerogel for Efficient Thermal Insulation and Flame Retardancy

引用

Chinese Journal of Polymer Science 2025年第1期43卷 141-152,I0011页

作者： Wen-Wen Wu Jian-Xun Shang Na Li Yan Wang Jun-Rong Yu Zu-Ming Hu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Jiangsu Nantong Junyuan New Material Co Ltd.Nantong 22600China

The demand for anisotropic aerogels with excellent comprehensive properties in cutting-edge fields such as aerospace is *** on the above background,a novel heterocyclic para-aramid nanofiber/reduced graphene oxide(HPAN/rGO)composite aerogel was prepared by combining electrospinning and unidirectional *** anisotropic HPAN/rGO composite aerogel exhibited a honeycomb morphology in the direction perpendicular to the growth of ice crystals,and a through-well structure of directed microchannels in the direction parallel to the temperature *** varying the mass ratio of HPAN/rGO,a composite aerogel with an ultra-low density of 5.34-7.81 mg·cm^(-3) and an ultra-high porosity of 98%-99%was *** from the anisotropic structure,the radial and axial thermal conductivities of HPAN/rGO-3 composite aerogel were 29.37 and 44.35 mW·m^(-1)·K^(-1),respectively.A combination of software simulation and experiments was used to analyze the effect of anisotropic structures on the thermal insulation properties of ***,due to the intrinsic self-extinguishing properties of heterocyclic para-aramid and the protection of the graphene carbon layer,the composite aerogel also exhibits excellent flame retardancy properties,and its total heat release rate(THR)was only 5.8 kJ·g^(-1),which is far superior to many reported ***,ultralight anisotropic HPAN/rGO composite aerogels with excellent high-temperature thermal insulation and flame retardancy properties have broad application prospects in complex environments such as aerospace.

关键词： Heterocyclic para-aramid nanofiber Reduced graphene oxide Anisotropy Thermal insulation Flame retardancy

来源：评论

学校读者我要写书评

暂无评论

Plasmonic hybridization properties in polyenes octatetraene molecules based on theoretical computation

引用

Chinese Physics B 2023年第3期32卷 419-428页

作者：高楠朱国栋黄映洲方蔚瑞 Key Laboratory of Materials Modification by Laser Electronand Ion Beams(Ministry of Education)and School of PhysicsDalian University of TechnologyDalian 116024China State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China

Relationship of plasmonic properties of multiple clusters to molecular interactions and properties of a single cluster or molecule have become increasingly important due to the continuous emergence of molecular and cluster devices or systems.A hybrid phenomenon similar to plasmonic nanoparticle hybridization exists between two molecules with plasmon excitation *** use linear-response time-dependent density functional theory,real-time propagation time-dependent density functional theory,the plasmonicity index,and transition contribution maps(TCMs)to identify the plasmon excitation modes for the linear polyenes octatetraene with–OH and–NH_(2)groups and analyze the hybridization characteristics using charge *** results show that molecular plasmon hybridization exists when the two molecules are *** TCM analysis shows that the plasmon modes and hybridization result from collective and single-particle *** plasmon mode is stronger,and the individual properties of the molecules are maintained after coupling when there is extra charge depose in the molecules because the electrons are moving in the *** study provides new insights into the molecular plasmon hybridization of coupled molecules.

关键词： plasmon hybridization molecular plasmon time-dependent density functional theory(TDDFT)

来源：评论

学校读者我要写书评

暂无评论

Atomic study of hydrogen behaviors at∑3(111)grain boundary in equiatomic CoCrNi and CoCrNiFe alloys

引用

Tungsten 2022年第3期4卷 239-247页

作者： Hua-Qing Guan Yan-Mei Jing Shao-Song Huang Key Laboratory of Material Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian116024China

High-entropy alloys are potential advanced structural materials for applications in nuclear energy due to their proved high irradiation ***,exposing components made of structure materials to service conditions under certain nuclear environments may induce hydrogen embrittlement(HE)as one of the typical failure *** this work,we performed density functional theory(DFT)calculations to examine the role of specific element species in HE mechanism in CoCrNi and CoCrNiFe *** solution energy,binding energy and diffusion barrier of H atoms at∑3 GBs(GBs is short for grain boundaries)are *** on the DFT data,we found that Cr limits the H atom to a specific potential position,thus suppresses H *** dipole moment interaction between H and Fe atoms weakens the binding of H *** lattice distortion effect-induced trapping for H provides higher H diffusion barriers at∑3 GBs than that in pure Ni.

关键词： Hydrogen embrittlement Grain boundary DFT High-entropy alloy

来源：评论

学校读者我要写书评

暂无评论

Effect of Water Environment on Preparation of Polypyrrole/Carbon Cloth Composite Electrode by Vapour Phase Polymerization

Effect of Water Environment on Preparation of Polypyrrole/Ca...

引用

2024 International Conference Optoelectronic Information and Optical Engineering, OIOE 2024

作者： Shan, Xueshi Qin, Zongyi State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and Engineering Donghua University Shanghai201620 China

ISBN: (数字)9781510688209

ISBN: (纸本)9781510688193

Polypyrrole/carbon cloth flexible composite electrodes are prepared by growing polypyrrole on carbon cloth surface by vapour phase polymerization. This method is low-cost, scalable and does not require any conductive additives or adhesives during electrode fabrication. In addition, the influence of water vapour on electrode morphology and structure during the pyrrole vapour phase polymerization process was deeply studied. It was found that when water vapour was involved, the granular polypyrrole on the surface of carbon cloth was evenly distributed, and when the evaporation volume of water and pyrrole was 10: 1, the electrode prepared has the best energy storage performance (1118.5 mF cm-2 at 5 mA cm-2), when current density up to 20 mA cm-2, the electrode has 645.1 mF cm-2 capacitance, the corresponding capacitance retention is 57.6 % exhibiting a good prospect in the application of flexible energy storage devices. © 2025 SPIE.

关键词： Carbon electrodes

来源：评论

学校读者我要写书评

暂无评论

Capacitive behaviors for surface-sulfonated polyaniline nanofibers in different acidic electrolytes

Capacitive behaviors for surface-sulfonated polyaniline nano...

引用

2024 International Conference on materials Physics and Composites, ICMPC 2024

作者： Liu, Jiahui Qin, Zongyi State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and Engineering Donghua University Shanghai201620 China

Unique surface-sulfonated polyaniline nanofibers (PANI-S) were fabricated through one-pot polymerization to evaluate the feasibility of their applications as electrode materials for high-performance supercapacitors that can be operated in relatively weak acidic electrolytes. Benefiting from the self-doping effect and improved dispersion in aqueous solution for the nanofibers, as well as the effective buffering function of the electrolyte, the PANI-S exhibits excellent capacitive performance across a broad pH value range in acidic electrolytes. More clearly, the specific capacitance of the PANI-S remains remarkably stable, ranging from 752.4 to 754.4 F g-1 at a scan rate of 5 mV s-1 and from 575.4 to 536.8 F g-1 at a current density of 1 A g-1, as the pH value of the electrolyte varies from 0 to 6. However, the capacity retention rate of PANI-S gradually decreases from 79.2% to 37.2% as the current density increases from 1 A g-1 to 20 A g-1, with the pH of the buffered solution increasing from 0 to 6. The excellent electrochemical activity in low acidic electrolytes for PANI nanofibers can be attributed to the compensation effects of the self-doped local proton reservoir. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Nanofibers

来源：评论

学校读者我要写书评

暂无评论

Citric acid induced enhancement in capacitive performances of polyaniline/graphene gel electrode for flexible supercapacitors

Citric acid induced enhancement in capacitive performances o...

引用

2024 International Conference on materials Physics and Composites, ICMPC 2024

作者： Dong, Jiahui Qin, Zongyi State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and Engineering Donghua University Shanghai201620 China

A composite hydrogel electrode for a flexible supercapacitor was fabricated by dispersing polyaniline/graphene composite into a polyvinyl alcohol gel network in the presence of citric acid. It was found that the introduction of citric acid could greatly promote the capacitive performances of composite gel electrodes. The assembled flexible supercapacitor could exhibit a maximum specific capacitance of 321.3 F g-1 at 1 A g-1 with a capacitance retention rate of 76.0% (from 1 A g-1 to 20 A g-1). Furthermore, even after enduring 5000 cycles at 20 A g-1, the supercapacitor maintained 86.8% of its initial capacitance, demonstrating excellent cycling stability. This work indicated that the introduction of multifunctional organic acid offered a more efficient pore structure for facilitating charge transport and dextral charge storage for gel electrodes, as a result, significant enhancement in capacitive performances. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Charge transfer

来源：评论

学校读者我要写书评

暂无评论

First principles study of behavior of helium at Fe(110)-graphene interface

引用

Chinese Physics B 2021年第4期30卷 432-437页

作者： Yan-Mei Jing Shao-Song Huang Key Laboratory of Material Modification by Laser Ion and Electron Beams(Dalian University of Technology)Ministry of EducationDalian 116024China

Recently,metal-graphene nanocomposite system has aroused much interest due to its radiation tolerance ***,the related atomic mechanism for the metal-graphene interface is still ***,stainless steels with Fe as main matrix are widely used in nuclear ***,in this study,the atomic behaviors of point defects and helium(He) atoms at the Fe(110)-graphene interface are investigated systematically by first principles *** results indicate that graphene interacts strongly with the Fe(110) *** comparison with those of the original graphene and bulk Fe,the formation energy values of C vacancies and Fe point defects decrease significantly for Fe(110)-***,as He atoms have a high migration barrier and large binding energy at the interface,they are trapped at the interface once they enter into *** theoretical results suggest that the Fe(110)-graphene interface acts as a strong sink that traps defects,suggesting the potential usage of steel-graphene with multiply interface structures for tolerating the radiation damage.

关键词： Fe(110)-graphene helium interface first principles calculations

来源：评论

学校读者我要写书评

暂无评论

Electrospun Nanofibrous Composite Membranes for Separations

引用

Accounts of materials Research 2023年第2期4卷 180-192页

作者： Zheyi Meng Liping Zhu Xuefen Wang Meifang Zhu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and EngineeringDonghua UniversityShanghai 201620China

Electrospinning is regarded as an efficient method for directly and continuously fabricating *** electrospinning process is relatively simple and convenient to operate and can be used to prepare polymer nanofibers for almost all polymer solutions,melts,emulsions,and suspensions with sufficient *** addition,inorganic nanofibers can also be prepared via electrospinning by adding small amounts of polymers into the inorganic precursors,which are generally regarded as *** diameter of the electrospun nanofibers can be tuned from tens of nanometers to submicrons by changing the spinning *** nonwoven fabric stacked with electrospun fibers is a porous material with interconnected submicron pores,providing a porosity above 80%.However,limited by the unstable rheological properties of the electrospinning fluid,it is difficult to obtain nanofibers stably and continuously with an average diameter of<100 nm,which narrows the separation applications of the electrospun nanofibrous membranes to only microfiltration,air filtration,or use as membrane ***,to fully take advantage of electrospun nanofibrous membranes in other separation applications,electrospun nanofibrous composite(ENC)membranes were developed to improve and optimize their selectivity,permeability,and other separation *** composite membranes not only have all the advantages of single-layered or single-component membranes,but also have more flexibility in the choice of functional *** this account,we summarize the two combination strategies to design and fabricate ENC *** is based on the component combination,in which functional components are homogeneously or heterogeneously mixed in the fiber matrix or modified on the nanofiber *** other one is termed as the interfacial combination,in which functional skin layers are fabricated on the top of the electrospun membranes via interfacial deposition or interfacial polymerizat

关键词： composite separation fibers

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：