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Graphene oxide as a water transporter promoting germination of plants in soil

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Nano Research 2018年第4期11卷 1928-1937页

作者： Yijia He Ruirui Hu yujia zhong Xuanliang Zhao Qiao Chen Hongwei Zhu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering and Center for Nano andMicro Mechanics Tsinghua University Beijing 100084 China

Graphene oxide （GO） is a graphene derivative bearing various oxygen-containing functional groups attached to the basal plane and to the edges of the graphene lattice and hence has a unique structure in which numerous hydrophobic sp2 clusters are isolated within the hydrophilic sp3 C-O matrix. In this study, the hydrophilic nature and water-transporting properties of GO were exploited to promote germination and growth of plants. It was found that a low dose of GO significantly promoted the germination of spinach and chive in soil. The oxygen-containing functional groups of GO collected water, and the hydrophobic sp2 domains transported water to the seeds to accelerate the germination of plants. The strong interaction between GO and the surfaces of soil grains stabilized GO in the soil and prevented dissipation of GO. In addition, no GO was detected either on the surface or inside the cells of plants; this finding confirmed that GO was not phytotoxic. Therefore, GO may serve as a promising nontoxic additive to increase a plant yield.

关键词： graphene oxide plant growth germination water transporter

Heterojunction solar cells based on graphene woven fabrics and silicon

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Journal of Materiomics 2018年第2期4卷 135-138页

作者： yujia zhong Yequan Xiao Qiao Chen Hongwei Zhu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringCenter for Nano and Micro MechanicsTsinghua UniversityBeijing 100084China

Graphene-on-semiconductor has been proved to be a quality heterojunction with efficient photoelectric *** this work,we constructed Schottky junction solar cells by combing graphene woven fabrics(GWFs)and n-doped single crystal silicon,and examined the performance of solar cells when GWFs of different meshes were *** GWFs possessed high optical transparency but led to poor carrier collection,whereas dense GWFs could collect carriers efficiently but generated too few photo carriers due to low *** GWFs with an optimal mesh could provide a good balance between the generation and collection of photo-induced carriers to deliver high power conversion efficiency.

关键词： Graphene Heterojunction Solar cell

Morphology-controlled Tantalum Diselenide Structures as Self-optimizing Hydrogen Evolution Catalysts

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Energy & Environmental Materials 2020年第1期3卷 12-18页

作者： Min Wang Li Zhang Meirong Huang Yuan Liu yujia zhong Jialiang Pan Yiran Wang Hongwei Zhu State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineeringand Center for Nano and Micro MechanicsTsinghua UniversityBeijing China

Metallic layered transition metal dichalcogenides(TMDs)nanomaterials based on Group 5 transition metals are attracting substantial interests as alternative catalysts for hydrogen evolution reaction(HER).However,controllable preparation of tantalum diselenide(TaSe2)remains challenging,which has hindered the exploration on its application in ***,we develop a facile method named surface-assisted chemical vapor transport(SACVT)for controllable synthesis of TaSe2 plates and nanobelts,by regulating the molar ratio of selenium to tantalum and reaction *** quasi-arrays and self-supported structure help TaSe2 nanobelt own more active sites and higher ability of charge transfer,so it is superior to TaSe2 plate in electrocatalytic ***,they both exhibit the ability to optimize their morphologies upon cycling for dramatically improved and robust electrocatalytic *** selfoptimized structures can increase the effective active surface by exposing more active sites on the basal-planes and edges,shorten the interlayer electron-transfer pathways at a thinned domain,and accelerate the charge transfer,which mainly derive from high basal-plane activity and weak interaction between layers of metallic *** work provides a reliable way for controllable synthesis of different TaSe2 structures,motivating further efforts to explore new high-efficiency catalysts in the large family of metallic TMDs for electrochemical energy conversion.

关键词： tantalum diselenide surface-assisted chemical vapor transport electrocatalyst self-optimization

Hydrophobic ionic liquid-in-polymer composites for ultrafast,linear response and highly sensitive humidity sensing

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Nano Research 2021年第4期14卷 1202-1209页

作者： Xuanliang Zhao Kanglin Zhou yujia zhong Peng Liu Zechen Li Jialiang Pan Yu Long Meirong Huang Abdelrahman Brakat Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Electronic Engineering Tsinghua UniversityBeijing 100084China Department of Mechanical Engineering University of CaliforniaBerkeleyUSA

Traditional ionic liquids are sensitive to humidity but with long response time and nonlinear *** liquid-state ionic liquids are usually hard for dehydration which have ultralong response time for humidity *** immobilization of ionic liquids provide a possible way for high performance humidity *** materials and structures also promised faster response in humidity sensing,because of easier desorption of *** this work,we prepared flexible humidity sensitive composites based on hydrophobic ionic liquid and *** combination of hydrophobic ionic liquid with hydrophobic polymer realized linear response,high sensitivity with low hysteresis to *** adjusting the ratio of ionic liquid,not only the impedance but also the hydrophobicity of composite could be modulated,which had a significant influence on the humidity sensing *** morphology and microstructure of the material also affected its interaction with water *** to the diverse processing methods of polymer,highly transparent film fabricated by spinning-coating and nanofibrous membrane fabricated by electrospinning could be prepared and exhibited different response time,which could be used for different application ***,the fibrous membrane made with electrospinning method showed an ultrafast response and could distinguish up to 120 Hz humidity change,due to its fibrous structure with high specific surface *** humidity sensors with ultrafast,linear response and high sensitivity showed potential applications in human respiratory monitoring and flexible non-contact *** better show the multifunction of ionic liquid-polymer composite,as a proof of concept,we fabricated an integrated humidity sensitive color change device by utilizing lower ionic liquid content composite for sensing in the humidity sensing module and higher ionic liquid content composite as the electrolyte in the electrochromic module.

关键词： ionic liquid flexible humidity sensing ultrafast response hydrophobic

Nest-like multilevel structured graphene oxide-on-polyacrylonitrile membranes for highly efficient filtration of ultrafine particles

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Journal of Materiomics 2019年第3期5卷 422-427页

作者： Jing Li Danzhen Zhang Xin Jiang Xuanliang Zhao Ruirui Hu yujia zhong Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

Developing filtration media for particulate matter(PM)removal has been proven to be extremely ***,we report a facile and scalable strategy to fabricate a multi-level structured polyacrylonitrile/graphene oxide(PAN/GO)air filtration membrane to remove ultrafine particles in air by combining multi-jet electrospinning and physical *** approach allows the thin PAN nanofibers and two-dimensional GO nanosheets to form interpenetrating bonding structures on non-woven fabric and to assemble into stable filtration *** resultant composite membranes can filtrate 300 nm particles with a high removal efficiency of 98.8%,a low pressure drop of 55 Pa,and a desirable quality factor of 0.34 Pa^(-1).This multi-level PAN/GO filter is expected to have wider applications not only for the ultrafine particle filtration and separation but also for the design of three-dimensional functional structures in the future.

关键词： Graphene oxide Polyacrylonitrile Electrospinning Ultrafine particles

The targeting expression of the vascular endothelial growth factor gene in endothelial cells regulated by ***-1

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Science China(Life Sciences) 2008年第11期51卷 959-965页

作者： ZHENG XiangRong, ZHANG ShangShang, YANG yujia, WANG Xia, zhong Le & YU XiaoHe Department of Pediatrics, Xiangya Hospital, Central South University, Changsha 410008, China 1. Department of Pediatrics Xiangya Hospital Central South University Changsha 410008 China

The success of gene therapy depends largely on the efficacy of gene delivery vector systems that can deliver genes to target organs or cells selectively and efficiently with minimal toxicity. Here, we show that by using the ***-1 regulatory element, we were able to restrict expression of the transgene of vascular endothelial growth factor (VEGF) to endothelial cells exclusively in hypoxic conditions. Eukaryotic expression vectors such as ***-1, pcDNA3.1-VEGF+Pa, pcDNA3.1-ppET-1+ EGF+Pa, and ***-1+VEGF+Pa were constructed by using a series of nuclear molecule handling methods like PCR, enzyme digestion. The recombinant vectors were transfected into HUVEC cells and HL7702 cells by the lipofectin method. GFP expression was observed with a fluorescence microscope to validate the specificity of expression in endothelial cells under the regulation of ***-1 element. Cobalt chloride (final concentration 100 μmol/L) was added to the medium to mimic hypoxia in vitro. After transfection of vectors, the expression of VEGF mRNA was detected by RT-PCR, and the expression of VEGF was detected by Western blotting and ELISA methods under normoxia and hypoxia, respectively. The cell proliferation rate was detected by the MTT test. The ex- pression of GFP revealed that the exterior gene was transcripted effectively in endothelial cells regu- lated by the ***-1 element, while the expression of GFP was very weak in nonendothelial cells. The results of RT-PCR, Western blotting and ELISA showed that VEGF gene expression in the ***-1+VEGF+Pa group and in the pcDNA3.1-ppET-1+VEGF+Pa group was higher in hypoxia than it was in normoxia (P<0.05). The MTT test showed that the proliferation rate of HUVEC transfected with HPVA under hypoxia exceeded that of the control group. We conclude that the ***-1 element was expressed specifically in endothelial cells, and can increase the expression of VEGF in hypoxia and stimulate proliferation of

关键词： hypoxia-responsive element human preproendothelin-1 promoter vascular endothelial growth factor endothelial cells

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瑞士罗纳-瑟尔河流规划决策机制研究与启示

工业建筑 2020年第1期50卷 55-61页

作者：钟誉嘉吴丹子林箐北京林业大学

近年来,国内在河流规划中对规划决策机制的研究较为贫乏,在平衡多种利益诉求冲突、实现效益最大化方面仍存在不足,尚未形成标准化和程序化的决策机制。以瑞士罗纳-瑟尔(Rhone-Thur)河道振兴方案为例,从河流规划决策的主体组成部分及其... 详细信息

近年来,国内在河流规划中对规划决策机制的研究较为贫乏,在平衡多种利益诉求冲突、实现效益最大化方面仍存在不足,尚未形成标准化和程序化的决策机制。以瑞士罗纳-瑟尔(Rhone-Thur)河道振兴方案为例,从河流规划决策的主体组成部分及其相互关系、决策过程中的程序与决策支持方式两个方面阐述了瑞士河流规划决策的经验方法,对国内相关机制提出了完善河流规划决策主体的组织协调、慎重考虑决策程序的完整性和复杂性、积极开发多种科学预测方法三个层面的建议。

关键词：风景园林河流规划决策支持系统瑞士

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城市垃圾填埋场景观再生策略探讨

工业建筑 2019年第11期49卷 33-37页

作者：钟誉嘉吴丹子林箐北京林业大学

城市化的快速发展使全球范围内产生了大量的垃圾填埋场,中国超过2/3的城市正深陷垃圾围城的困局,如何改造和利用这些废弃的垃圾填埋区,实现土地价值的最大化成为了一个重要的研究方向.目前国际主流改造方式已从单纯的焚烧、填埋转向为... 详细信息

城市化的快速发展使全球范围内产生了大量的垃圾填埋场,中国超过2/3的城市正深陷垃圾围城的困局,如何改造和利用这些废弃的垃圾填埋区,实现土地价值的最大化成为了一个重要的研究方向.目前国际主流改造方式已从单纯的焚烧、填埋转向为景观改造及公共空间重塑&通过对世界范围内多个垃圾填埋区景观案例的深入研究,分析这些项目的主导方%用途和模式、后期收益、改造障碍等方面,探讨项目相关生态修复手段、景观营造策略、公众参与、学科合作%组织运营等方面的价值和意义,总结垃圾填埋场景观营造策略.

关键词：风景园林后工业景观填埋区景观重生

从“空间优化”到“居民内聚”:社区公共空间更新中融入儿童参与的实践路径

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现代城市研究 2024年第6期39卷 30-37页

作者：王鑫张博珺张楠钟誉嘉北京交通大学建筑与艺术学院北京航空航天大学法学院上海交通大学设计学院苏州大学金螳螂建筑学院

儿童是家庭、社区乃至社会的关键纽带,在社区更新中融入儿童参与,对提升空间品质、增强社区凝聚力、构建儿童友好社区具有积极意义。研究聚焦我国社区公共空间更新中的儿童参与路径,梳理发现既有研究多侧重从长周期、多活动中总结儿童... 详细信息

儿童是家庭、社区乃至社会的关键纽带,在社区更新中融入儿童参与,对提升空间品质、增强社区凝聚力、构建儿童友好社区具有积极意义。研究聚焦我国社区公共空间更新中的儿童参与路径,梳理发现既有研究多侧重从长周期、多活动中总结儿童参与的经验和意义,较少将单次公共空间更新全过程展开,并聚焦各阶段儿童参与情况。依托上海市三林苑小区社区公共空间更新实践,归纳儿童在各阶段的介入方式、参与情况和影响程度,提出在营建和运维阶段举行“快闪主题活动”,降低参与门槛,促进居民互动。综合理论探讨与实证分析,总结出关注儿童需求、选择适宜行为、培育行动团体的可循环路径,推动儿童参与在社区公共空间更新过程中的融入。社区空间促进儿童社交,深度连接家庭参与社区更新,实现社区内聚和可持续发展。

关键词：儿童参与社区更新社区公共空间上海快闪