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Facile Synthesis of Multi-Branched Gold Nanostructures through a TBAB-Assisted Route in Aqueous Solution and Their SERS Property

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Chinese Journal of Chemistry 2011年第1期29卷 185-190页

作者： Wang, Luyan wu, xinzhou Pei, Meishan wu, Zhiyan Li, Xiaonan Tao, Xutang School of Chemistry and Chemical Engineering University ofJinan Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials Jinan Shandong 250022 China State Key Laboratory of Crystal Materials (Shandong University) Jinan Shandong 250100 China

Facile synthesis of multi-branched gold nanostructures by using the tetrabutyl ammonium bromide （TBAB） as a capping agent is described. The reaction is carried out in a one-step process at mild temperature. Gold nanostructures with more than six sharp branches ranging from 70 to 130 nm in length are synthesized in high yield. It is proposed that the relative weak adsorption capacity of TBAB leads to the incompletely covered gold surface and the growth of nanoparticles occurs on the uncovered gold surface, and therefore short branches appear consequently. Then positively charged TBAB layers on the gold surfaces prevent the branches from aggregating with each other which stimulates the branch growth. The prepared branched gold nanoparticles show efficient surface-enhanced Raman scattering （SERS） properties. Low temperature （4 ℃） is unfavorable to the formation of multi-branched gold nanostructures, and only thin small irregular plate-like nanoparticles are produced. The addition of SDS in TBAB aqueous solution results in forming SDS micelles at much lower concentration of SDS （0.4 mmol/L） as compared to that in pure water, and short branched gold nanoparticles are obtained in the SDS-TBAB system.

关键词： gold multi-branched nanostructures tetrabutyl ammonium bromide surface-enhanced Ramanscattering

Reactive molecular dynamics insight into the thermal decomposition mechanism of 2,6-Bis(picrylamino)-3,5-dinitropyridine

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Defence Technology（防务技术） 2024年第3期33卷 134-146页

作者： Jianbo Fu Hui Ren xinzhou wu Yongjin Chen Mi Zhang Yazhi Cheng State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

2,6-bis(picrylamino)-3,5-dinitropyridine(PYX)has excellent thermostability,which makes its thermal decomposition mechanism receive much *** this paper,the mechanism of PYX thermal decomposition was investigated thoroughly by the ReaxFF-lg force field combined with DFT-B3LYP(6-311++G)*** detailed decomposition mechanism,small-molecule product evolution,and cluster evolution of PYX were mainly *** the initial stage of decomposition,the intramolecular hydrogen transfer reaction and the formation of dimerized clusters are earlier than the denitration *** the progress of the reaction,one side of the bitter amino group is removed from the pyridine ring,and then the pyridine ring is *** final products produced in the thermal decomposition process are CO_(2),H_(2)O,N_(2),and H_(2).Among them,H_(2)O has the earliest generation time,and the reaction rate constant(k_(3))is the *** clusters are formed during the decomposition of PYX,and the formation,aggregation,and decomposition of these clusters are strongly affected by *** low temperatures(2500 K-2750 K),many clusters are *** high temperatures(2750 K-3250 K),the clusters aggregate to form larger *** 3500 K,the large clusters decompose and become *** the late stage of the reaction,H and N in the clusters escaped almost entirely,but more O was trapped in the clusters,which affected the auto-oxidation process of ***'s initial decomposition activation energy(E_(a))was calculated to be 126.58 kJ/*** work contributes to a theoretical understanding of PYX's entire thermal decomposition process.

关键词： PYX Thermal decomposition ReaxFF-lg MD simulations Excellent thermostable explosives

维普期刊数据库

Nanoparticle-immersed paper imprinting mass spectrometry imaging reveals uptake and translocation mechanism of pesticides in plants

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Nano Research 2020年第3期13卷 611-620页

作者： xinzhou wu Run Qin Hanxiang wu Guangkai Yao Yue Zhang Ping Li Yizhu Xu Zhixiang Zhang Zhibin Yin Hanhong Xu State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources South China Agricultural UniversityGuangzhou510642China Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education South China Agricultural UniversityGuangzhou510642China School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhou510006China

Design and discovery of carrier-mediated modified pesticides are vital for reducing pesticide dosage and increasing utilization,yet it remains a great challenge due to limited insights into plant translocation ***/nanoparticle assisted laser desorption/ionization strategy has established itself as a preferential analytical tool for biological tissue analysis,whereas potential applications in plant sciences are hindered with regard to the inability to slice plant leaves and ***,we report gold nanoparticle(AuNP)-immersed paper imprinting mass spectrometry imaging(MSI)for the spatiotemporal visualization of pesticide translocation in plant *** approach plays a dual role in preserving spatial information and improving ionization efficiency for pesticides regardless of imaging artifacts due to homogenous AuNP *** this MSI platform,we proposed the elaborate plant translocation mechanism of agrochemicals for the first time,which is currently poorly *** dynamic processes of carrier-mediated pesticides can be clearly visualized,including crossing of plasma membranes by transporters,translocation downward in stems through the phloem,diffusion to the xylem and,conversely,accumulation at margins of the treated ***,this AuNP-assisted paper imprinting method could be highly compatible with laser-based MSI instruments,expediting researches across a broad range of fields,especially in nanomaterial development and life sciences.

关键词： gold nanoparticles nanoparticle-immersed paper imprinting mass spectrometry imaging plant translocation mechanism carrier-mediated pesticides

In-situ-selective-UV crosslinking fabrication of solid liquid host guest electrolyte: A facile one-step method realizing highly flexible electrochromic device

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Nano Research 2024年第11期17卷 9712-9720页

作者： Changwei Tan Zishou Hu Zhiyi Guo Zheng Cui Ling Bai xinzhou wu Chenchao Huang Wenming Su School of Materials Science and Engineering Jiangsu University Zhenjiang 212013 China Printable Electronics Research Center Nano Devices and Materials Division Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China School of Materials Science and Engineering Suzhou University of Science and Technology Suzhou 215009 China

Flexible electrochromic devices (FECDs) are promising candidates for the next generation of wearable electronics due to their low operating voltage and energy consumption. For the flexible electrochromic devices, the electrolyte is an important component. Typically, the electrolyte needs to be formulated according to the device structure and usage scenario. A high-performance electrolyte involves consideration of many factors, including choosing the right polymer, solvent, curing agent, and ion type to satisfy particular device specifications. In this work, a ultraviolet-curable solid–liquid host–guest (UV-SLHG) electrolyte is developed. Several aspects of performance are improved by introducing the solid–liquid coexisting microstructure without changing the electrolyte formulation, including excellent adhesion, a 30% increase in tensile characteristics, and a seven-fold increase in ionic conductivity when compared to a fully cured solid-state electrolyte. More importantly, the unique advantage of SLHG electrolytes lies that the thickness will not change significantly during bending. The FECD made by using the UV-SLHG-based electrolyte sustained 10,000 bending cycles at the bending radius of 2.5 mm while maintaining outstanding optical modulation. A wearable ring-type ECD and a battery-free FECD wine label were made as demonstrators. The UV-SLHG strategy is not only suitable for the FECDs but also universally applicable to other electrolyte-based of flexible electronics such as flexible capacitors and batteries.

关键词： electrolyte one-step method solid–liquid-state host guest highly flexible electrochromic devices

Printed stretchable circuit on soft elastic substrate for wearable application

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Journal of Semiconductors 2018年第1期39卷 232-237页

作者： Wei Yuan xinzhou wu Weibing Gu Jian Lin Zheng Cui Printable Electronics Research Centre Suzhou Institute of Nanotech and Nano-Bionics Chinese Academy of Sciences

In this paper, a flexible and stretchable circuit has been fabricated by the printing method based on Ag NWs/PDMS composite. The randomly oriented Ag NWs were buried in PDMS to form a conductive and stretchable electrode. Stable conductivity was achieved with a large range of tensile strain（0-50%） after the initial stretching/releasing cycle. The stable electrical response is due to the buckling of the Ag NWs/PDMS composite layer. Furthermore, printed stretchable circuits integrated with commercial ICs have been demonstrated for wearable applications.

关键词： printed electronics silver nanowires stretchable electronics wearable electronics

维普期刊数据库

Plasmonic polydopamine-modified TiO_(2)nanotube substrates for surface-assisted laser desorption/ionization mass spectrometry imaging

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Nano Research 2023年第2期16卷 3028-3039页

作者： Dong Chen Mingyi Du Yudi Huang Yizhu Xu Yingying Chen Lianlian Ma Qingrong Xie Xinhai Zhu Zilong Chen Hanhong Xu xinzhou wu Zhibin Yin State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources and Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education South China Agricultural UniversityGuangzhou 510642China Agro-biological Gene Research Center Guangdong Academy of Agricultural SciencesGuangzhou 510640China Instrumental Analysis and Research Center Sun Yat-sen UniversityGuangzhou 510275China

Mass spectrometry imaging(MSI)has made the spatio-chemical characterization of a broad range of small-molecule metabolites within biological tissues ***,available matrix-assisted laser desorption/ionization mass spectrometry(MALDI-MS)suffers from severe background interferences in low-mass ranges and inhomogeneous matrix ***,surface-assisted LDI-MS(SALDI-MS)has been an attractive alternative for high-sensitivity detection and imaging of small *** this study,we construct a new composite substrate,hydrophobic polydopamine(hPDA)-modified TiO_(2)nanotube(TDNT)coated with plasmonic gold nanoparticle(AuNP-hPDA-TDNT),as a dual-polarity SALDI substrate using an easy and cost-effective fabrication *** from the synergistic effects of TDNT semiconductor and plasmonic PDA modification,this SALDI substrate exhibits superior performance for dual-polarity detection of a vast diversity of small *** reduced background interferences,lower detection limits,and spot-to-spot repeatability can be achieved using AuNP-hPDA-TDNT *** to its unique imprinting performance,various metabolites and lipids can be visualized within jatropha integerrima petals,ginkgo leaves,strawberry fruits,and latent *** valuably,the universality of this matrix-free substrate is demonstrated for mapping spatial distribution of lipids within mouse brain tissue *** together,this AuNP-hPDA-TDNT material is expected to be a promising SALDI substrate in various fields,especially in nanomaterial development and life sciences.

关键词： TiO_(2)nanotube surface-assisted laser desorption/ionization(SALDI) mass spectrometry imaging latent fingerprint tissue imaging

Spatiotemporal visualization of the synthesis and accumulation of rotenone in Derris elliptica roots using mass spectrometry imaging

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Advanced Agrochem

Advanced Agrochem 2023年第4期2卷 340-348页

作者： Ping Li Yingying Chen Qingrong Xie Yizhu Xu Zhen Li Yuan Li Zhibin Yin Xinhai Zhu Hanhong Xu xinzhou wu National Key Laboratory of Green Pesticide and Key Laboratory of Natural Pesticide and Chemical Biology of the Ministry of Education South China Agricultural UniversityGuangzhou510642China Agro-biological Gene Research Center Guangdong Academy of Agricultural SciencesGuangzhou510640China Key Laboratory of Bio-Pesticide Creation and Application of Guangdong Province College of Plant ProtectionSouth China Agricultural UniversityGuangzhou510642China Instrumental Analysis and Research Center Sun Yat-sen UniversityGuangzhou510275China

The discovery of novel botanical pesticides as a preferred alternative to synthetic pesticides is regarded as an environmentally friendly strategy,yet it remains a great challenge due to limited insights into the synthesis and accumulation of active ingredient ***,we demonstrate the use of gold nanoparticle(AuNP)-assisted laser desorption/ionization mass spectrometry imaging(LDI-MSI)for the tissue-specific distribution and spatiotemporal accumulation effect of rotenone and active ingredient intermediates in its biosynthetic pathway within the roots of Derris *** MSI results revealed that rotenone was mainly concentrated in the epidermis,cortex,and xylem in the first two years and began to accumulate in the phloem since the 3rd ***,the rotenone contents increased in the epidermis,cortex,and xylem in the 4th year and finally decreased in the 5th *** ultra-performance liquid chromatography(UPLC)results revealed that there was a significant difference in rotenone content between the root and non-root bark(p<0.05)except for the 1st *** reached its maximum value at 9.71%in the root bark in the 4th year and 7.98%in the non-root bark in the 1st year,which was in accordance with the MSI ***,the active ingredient intermediates in the Hydroxylation/Methylation and Rotenoid Phases of the biosynthetic pathway of rotenone were concentrated in the root *** together,the collective results provide the scientific guidance for the scientific cultivation of *** and the efficient extraction of botanical pesticides.

关键词： Rotenone Derris elliptica root Mass spectrometry imaging Spatial distribution Temporal accumulation

车轮多边形磨耗对地铁列车蠕滑特性的影响分析

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中国测试 2024年第1期50卷 106-112页

作者：杨岗吴欣洲西南交通大学机械工程学院四川成都610031

为研究车轮多边形磨耗对轮轨接触蠕滑特性的影响,依据多体动力学理论和滚动接触理论,建立基于地铁列车参数的多体动力学模型,并计算多工况下车轮踏面磨耗指数,分析车轮多边形阶数和幅值变化对轮轨力、蠕滑率和蠕滑力等特性的影响,结果表... 详细信息

为研究车轮多边形磨耗对轮轨接触蠕滑特性的影响,依据多体动力学理论和滚动接触理论,建立基于地铁列车参数的多体动力学模型,并计算多工况下车轮踏面磨耗指数,分析车轮多边形阶数和幅值变化对轮轨力、蠕滑率和蠕滑力等特性的影响,结果表明:蠕滑率以及蠕滑力会随车轮多边形阶数和幅值的上升而增大;车轮踏面磨耗随地铁列车运行里程的增加而逐步增大。使用轮轨垂向力指标,根据车速小于160 km/h,轮轨力应不大于200 kN的标准,确定地铁列车80 km/h运行速度下3~23阶多边形幅值安全限值,结果表明多边形幅值安全限值随阶数增加呈下降趋势。

关键词：车轮多边形地铁列车踏面磨耗蠕滑特性

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Najaatra venom peptide selectively blocks voltage-gated sodium channel Nav1.8 to abolish pain

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Najaatra venom peptide selectively blocks voltage-gated sodi...