检索结果-南通市图书馆

Stacking MoS_(2) flower-like microspheres on pomelo peels-derived porous carbon nanosheets for high-efficient X-band electromagnetic wave absorption

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2024年第3期17卷 1607-1615页

作者： Jia Zhao Zhe Gu Qingguo Zhang College of Chemistry and Materials Engineering Bohai UniversityJinzhou 121013China

The key to solve increasingly severe electromagnetic(EM)pollution is to explore sustainable,easily prepared,and cost-effective EM wave absorption materials with exceptional absorption capability.Herein,instead of anchoring on carbon materials in single layer,MoS_(2) flower-like microspheres were stacked on the surface of pomelo peels-derived porous carbon nanosheets(C)to fabricate MoS_(2)@C nanocomposites by a facile solvothermal process.EM wave absorption performances of MoS_(2)@C nanocomposites in X-band were systematically investigated,indicating the minimum reflection loss(RLmin)of-62.3 dB(thickness of 2.88 mm)and effective absorption bandwidth(EAB)almost covering the whole X-band(thickness of 2.63 mm)with the filler loading of only 20 wt.%.Superior EM wave absorption performances of MoS_(2)@C nanocomposites could be attributed to the excellent impedance matching characteristic and dielectric loss capacity(conduction loss and polarization loss).This study revealed that the as-prepared MoS_(2)@C nanocomposites would be a novel prospective candidate for the sustainable EM absorbents with superior EM wave absorption performances.

关键词： pomelo peels-derived porous carbon nanosheets(C) MoS_(2)@C nanocomposites stacked structure electromagnetic(EM)wave absorption

PVDF/PLA electrospun fiber membrane impregnated with metal nanoparticles for emulsion separation,surface antimicrobial,and antifouling activities

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

Science China(Technological Sciences) 2023年第5期66卷 1461-1470页

作者： XIANG Xin CHEN DongYun LI NaJun XU QingFeng LI Hua HE JingHui LU JianMei college of chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou215123China

Although many superwetting materials have been designed for the treatment of oil-containing wastewater,separation strategies for oil-in-water systems containing bacteria have rarely been reported.Herein,poly(vinylidene difluoride)-and poly(lactic acid)-blended fibrous membranes loaded with silver and copper oxide nanoparticles were successfully prepared by a two-step method of electrostatic spinning and liquid-phase synthesis.The product membrane showed excellent super-oleophilic properties in air and hydrophobicity under oil.It could separate water-in-oil emulsion systems containing surfactants with an efficiency above90%.More importantly,the nanoparticle-loaded fibers were characterized by material degradability and slowly released ions.The fibers exhibited excellent antibacterial activities against both gram-positive and-negative bacteria.This work provides a feasible strategy for water-in-oil emulsion separation and bacterial treatment of wastewater.

关键词： emulsion separation antibacterial activity electrostatic spinning Ag nanoparticles

基于非对称PVA/墨水/PE双层膜的光驱动柔性致动器和多功能传感器

在线全文

学校读者我要写书评

暂无评论

Science China materials 2023年第12期66卷 4782-4793页

作者：吴凤林晓莹许雨倩章迪何韵晴刘明贤 Department of materials Science and engineering College of Chemistry and Materials ScienceJinan UniversityGuangzhou 511443China

聚乙烯醇/中国墨水混合物被均匀涂覆在聚乙烯薄膜上制备了结构稳定的双层软驱动器.由于两层材料的热膨胀系数的显著差异,在氙灯照射下,驱动器能以较快的响应速度实现较大的弯曲变形.通过改变光的强度以及结合尺蠖的仿生结构设计,机器人... 详细信息

聚乙烯醇/中国墨水混合物被均匀涂覆在聚乙烯薄膜上制备了结构稳定的双层软驱动器.由于两层材料的热膨胀系数的显著差异,在氙灯照射下,驱动器能以较快的响应速度实现较大的弯曲变形.通过改变光的强度以及结合尺蠖的仿生结构设计,机器人可以在不同的表面(如纸张和树叶)上实现各种形式的运动.同时在光的驱动下,它可以实现物体的捕获、表情的改变、象鼻的收缩与卷曲以及仿生花朵的开闭等.此外,基于双层驱动器良好的光热转换和灵敏的压力传感性能,它可以实现人体运动监测(如关节弯曲、呼吸、吞咽等),还能与光电转换装置集成.这种多功能、多驱动模式软机器人在可穿戴设备、交通运输、光电转换设备等应用领域具有巨大潜力.

关键词： Chinese ink soft actuator light-driven actuation integration of photoelectric conversion motion monitoring

具有改进的导热性能和力学性能的3D石墨烯/聚酰亚胺纤维框架

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2022年第6期29卷 1761-1777页

作者：王先鹏胡爱平陈小华刘继磊李艳花李传议王涵唐群力 college of materials Science and engineering Hunan UniversityChangsha 410082China college of materials and chemistry engineering Hunan Institute of TechnologyHengyang 421002China

电子元器件的集成化和柔性器件的普及,对热管理材料的散热能力和综合力学性能提出了更高要求。本文通过预氧化和氨基化对聚酰亚胺(PI)纤维进行改性,获得表面活性较强的PDA@OPI纤维,将其与氧化石墨烯(GO)充分混合,形成GO-PDA@OPI混合浆... 详细信息

电子元器件的集成化和柔性器件的普及,对热管理材料的散热能力和综合力学性能提出了更高要求。本文通过预氧化和氨基化对聚酰亚胺(PI)纤维进行改性,获得表面活性较强的PDA@OPI纤维,将其与氧化石墨烯(GO)充分混合,形成GO-PDA@OPI混合浆料。随后采用蒸发、碳化、石墨化和机械压实等工艺,制备得到具有3D长程互连结构的G-g PDA@OPI复合薄膜。PDA@OPI纤维通过构成稳定的共价键将相邻的GO片“焊接”在一起,有利于石墨化样品中负载的传递和应力的耗散。同时,这种增强的界面相互作用还显著促进了GO和PI纤维在石墨化过程中的协同效应,以此提高石墨产品的结晶度。另外,PDA@OPI纤维还为热处理进程中因含氧基团分解而产生的气体提供逸出通道,从而使GO片的膨胀效应得到抑制。结果显示,当PDA@OPI纤维的添加量为30%时,G-g PDA@OPI复合薄膜的拉伸强度、极限应变率以及热导率分别达到78.5 MPa,19.4%,1028 W/(m·K),表现出优异的柔韧性和高回弹率。

关键词：石墨烯薄膜改性聚酰亚胺纤维聚多巴胺热导率力学性能

Synergetic N-doped carbon with MoPd alloy for robust oxygen reduction reaction

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第7期16卷 8996-9002页

作者： Chaojie Cen Wenjing Tang Tonghui Zhao Yun Song Yun Yang Quanlong Xu Wei Chen Zhejiang Key Laboratory of Carbon materials College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Synergistic catalysis opens up a new venue to improve the comprehensive application of the catalyst.Herein,a composite catalyst(Mo-Pd@N-C)consisting of the N-doped carbon derived from pyrolysis of spherical polypyrrole and MoPd nanoparticles(NPs)was constructed to emphasize the strong metal-support interaction for robust oxygen reduction reaction(ORR).The enhanced anchoring between the MoPd NPs and the substrate,and the N-species formed on the carbon matrix make the Mo-Pd@N-C deliver excellent performance with a half-wave potential of 0.945 V(vs.reversible hydrogen electrode(RHE))for ORR,superior than that of commercial Pt/C(0.86 V).More importantly,it shows a negligible half-wave potential decline(<5 mV)and only~20%of mass activity(MA)attenuation after 30,000 cycles stability test,obviously better than those of Pt/C(~70%of MA attenuation and~30 mV of half-wave potential decline after only 15,000 cycles).This work highlights a novel synergistic method to prolong the life and improve the commercial prospects of the catalysts.

关键词： synergistic catalysis oxygen reduction reaction N-doped carbon MoPd alloy stability

POE enhanced stabilities of CsPbX_(3)(X=Br,Ⅰ)perovskite and their white LED application

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

Journal of Energy chemistry 2022年第4期31卷 193-200页

作者： Enrou Mei Jiaming Li Qingyun He Yao Tong Ruowang Liu Hongbin Fan Xiaojuan Liang Weidong Xiang College of Chemistry and Materials Engineering Wenzhou UniversityWenzhou 325035ZhejiangChina

Perovskite has received extensive attention due to its excellent properties, just like photoelectric, while the instability has always troubled us to the wide application of perovskite materials. Herein, we proposed to use SiO_(2)and POE to encapsulate perovskite nanocrystals(PNCs). In this work, we have successfully prepared a series of perovskite composite materials and films with different concentration ratios.Due to the protection of POE, the luminous intensity of CsPbBr_(3)@POE composite film remained above 90% after stayed in the water for 42 days. The lead concentration of CsPbBr_(3)@POE composite film was 0.8 μg/m L after 48 h of immersing in deionized water. Namely, packaging PNCs in POE could effectively prevent Pb from overflowing reduce Pb pollution. Besides, the composite films showed a wide colour gamut with 117% of NTSC colour gamut, which shows that this composite material has a development prospect in the WLED field.

关键词： CsPbX_(3)PNCs SiO_(2) POE Encapsulate WLED

MoO_(x) nanoclusters on Mo-doped TiO_(2) nanosheets with enhanced singlet oxygen generation and sulfide conversion abilities for photocatalytic aerobic oxidative desulfurization

在线全文

学校读者我要写书评

暂无评论

Science China chemistry 2024年第1期67卷 408-414页

作者： Suting Xie Xinyu Zhao Dongxiao Wang Huawei Yang Lixia Yang Liangjiu Bai Donglei Wei Wenxiang Wang Ying Liang Hou Chen Shaojun Guo college of chemistry and materials Science Ludong UniversityYantai 264025China college of materials Science and engineering Peking UniversityBeijing 100871China

Photocatalytic aerobic oxidation desulfurization(PAODS)is a promising and sustainable alternative to conventional,energyintensive desulfurization techniques for petroleum products.However,its development is greatly plagued by the low capability in generating highly reactive oxygen species and sluggish kinetics of sulfide oxidation of reported photocatalysts.Here we report a class of MoO_(x)nanocluster decorated on ultrathin Mo-doped TiO_(2)nanosheet(MoO_(x)/MoTiO)catalyst for efficiently facilitating the photocatalytic aerobic oxidation of sulfides.We demonstrate that MoO_(x)/MoTiO can not only promote the generation of highly reactive singlet oxygen(^(1)O_(2))but also enhance the aerobic conversion of sulfides,which leads to a record dibenzothiophene oxidation activity of 3.90 mmol g^(-1)h^(-1).The multiple experimental characterizations and density functional theory calculations collectively reveal that the doped-Mo sites can interact with the photogenerated excitons,enabling directly energy transfer generation of^(1)O_(2)through a new exciton modulation mechanism,and the coordination unsaturated MoO_(x)clusters play the role of co-catalyst to enhance the separation of charge carriers,and effectively catalyze the reaction between sulfides and1O_(2)to form sulfones.

关键词： titanium dioxide photocatalytic aerobic oxidation desulfurization dibenzothiophene singlet oxygen

2D/2D hierarchical Co_(3)O_(4)/ZnIn_(2)S_(4)heterojunction with robust builtin electric field for efficient photocatalytic hydrogen evolution

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 6134-6141页

作者： Guping Zhang Xunxun Li Mengmeng Wang Xueqing Li Yaru Wang Shuting Huang Dongyun Chen Najun Li Qingfeng Xu Hua Li Jianmei Lu college of chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China

Because of its importance in enhancing charge separation and transfer,built-in electric field engineering has been acknowledged as an effective technique for improving photocatalytic performance.Herein,a stable p–n heterojunction of 2D/2D(2D:twodimensional)Co_(3)O_(4)/ZnIn_(2)S_(4)with a strong built-in electric field is precisely constructed.The Co_(3)O_(4)/ZnIn_(2)S_(4)heterojunction exhibits a higher visible-light photocatalytic hydrogen(H2)evolution rate than the individual components,which is primarily attributed to the synergy effect of improved light absorption,abundant active sites,short charge transport distance,high separation efficiency of photogenerated carriers.Furthermore,the photoelectrochemical studies and density functional theory(DFT)calculation results demonstrate that the enhanced interfacial charge separation and migration induced by the generated built-in electric field are the critical reasons for the boosted photocatalytic performance.This research might pave the way for the rational design and manufacturing of 2D/2D heterojunction photocatalysts with extremely efficient photocatalytic performance for solar energy conversion.

关键词： 2D/2D heterojunction photocatalysis built-in electric field interfacial charge transfer H_(2)evolution

含有丰富铁物种的配体诱导中空MOF衍生碳纳米材料用于高效氧还原反应

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

Science China materials 2023年第6期66卷 2257-2265页

作者：毛璐娇葛勇杰陈丹丹杨远东徐少杰薛金航肖逵逵周学梅钱金杰杨植 Key Laboratory of Carbon materials of Zhejiang Province College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

合理地设计和制备低成本、高效、稳定的非贵金属基碳纳米材料具有重要意义.本文中我们在不同温度条件下,通过有机配体交换将MOF-5转换为ZIF-8,其过程中可以捕捉到ZIF-8的中间态(ZIF-8-M)并得到最终态(ZIF-8-F).将掺杂Fe离子的MOF材料进... 详细信息

合理地设计和制备低成本、高效、稳定的非贵金属基碳纳米材料具有重要意义.本文中我们在不同温度条件下,通过有机配体交换将MOF-5转换为ZIF-8,其过程中可以捕捉到ZIF-8的中间态(ZIF-8-M)并得到最终态(ZIF-8-F).将掺杂Fe离子的MOF材料进行热解后,得到的Fe-ZIF-8-F-900材料具有大的比表面积、高的石墨化程度、丰富的碳纳米管以及高活性的铁物种等优点.这些特性有助于后续氧还原反应(ORR)更好的电子转移和质量传输.与Pt/C相比,Fe-ZIF-8-F-900具有优异的ORR性能,如较正的起始电位(0.982 V),大的极限电流密度(5.41 mA cm^(-2))和较小的Tafel斜率(40.6 mV dec^(-1)),且在10小时后电流保持率仍高达94.4%.此外,实验和理论结果均证实了Fe-ZIF-8-F-900组装的锌空气电池在实际应用中表现优异.本研究将为高效、低成本的非贵金属基电催化剂的开发和制备提供合理的设计策略,并为其在能源相关领域的实际应用指明方向.

关键词：电子转移铁物种中间态碳纳米材料极限电流密度氧还原反应 Tafel斜率有机配体