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Synthesis of PS/Ag asymmetric hybrid particles via phase separation and self-assembly

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Particuology 2013年第6期11卷 768-775页

作者： xinlong fan Qiuyu Zhang Hepeng Zhang Baoliang Zhang Chunmei Li Xiangjie Li Xingfeng Lei Key Laboratory of Applied Physics and Chemistry in Space of Ministry of Education School of ScienceNorthwestern Polytechnical University

This article presents a facile approach to preparation of polystyrene/silver （PS/Ag） asymmetric hybrid par- ticles. In this method, polystyrene/polyglycidyl methacrylate （PS/PGMA） Janus particles were synthesized via internal phase separation triggered by evaporation of dichloromethane （DCM） from PS/PGMA/DCM- in water emulsion droplets. Then, the Janus particles were aminated and sequentially carboxylated to obtain PS/PGMA-NH2 and PS/PGMA-COOH particles. Ag＋ self-assembled on the surface of PGMA hemi- sphere of the functionalized PS/PGMA particles by coordinating with amine/carboxyl. PS/Ag asymmetric hybrid particles with 7.29 wt% of Ag were obtained by reduction of Ag＋, Scanning electron microscopy, energy-dispersive X-ray spectroscopy and transmission electron microscopy results confirmed that Ag was asymmetrically distributed on the surface of polymer particles.

关键词： Phase separation Interracial interaction Amination Carboxylation Coordination Self-assembly

Preparation of SiO_2/TiO_2 Janus particles by electrostatic assembly,hydrolysis and calcination

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Particuology 2013年第5期11卷 574-580页

作者： Baoliang Zhang Qiuyu Zhang Hepeng Zhang xinlong fan Dezhong Yin Xiangjie Li Wei Li Department of Applied Chemistry College of ScienceNorthwestern Polytechnical University

This paper describes a novel chemical method for preparing SiO2/TiO2 Janus particles. First, polystyrene （PSt）/SiO2 particles with a raspberry-like structure are prepared by electrostatic assembly. The influences of the reaction time of sulfonation and the treatment times of polyelectrolyte solutions （PDADMAC, PSS） on PSt and SiO2 are investigated with respect to the surface charge density of the particles. SiO2/TiO2 Janus particles are then obtained by hydrolysis of butyl titanate on the surface of PSt/SiO2 particles followed by a calcination process. Particle size analyzer, Zeta potential instrument, FTIR, TEM and SEM are used to characterize the particle size, the amount of charge on the surface of PSt and SiO2 particles and the compositions and morphologies of PSt/SiO2, SiO2/Ti02 and PSt/SiO2/Ti02. The diameters of the PSt, SiO2, PSt/Si02 and SiO2/Ti02 particles are 2.0 t^m, 303 nm, 2.7 bcm and 330 nm, respectively.

关键词： Janus particlesElectrostatic assemblyHydrolysisCalcination

A series of nanoparticles with phase-separated structures by 1,1-diphenylethene controlled one-step soap-free emulsion copolymerization and their application in drug release

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Nano Research 2017年第9期10卷 2905-2922页

作者： xinlong fan Jin Liu Xiangkun Jia Yin Liu Hao Zhang Shenqiang Wang Baoliang Zhang Hepeng Zhang Qiuyu Zhang Department of Applied Chemistry School of Natural and Applied Sciences Northwestern Polytechnical University No. 127 WestYouyi Road Xi'an 710072 China

A facile one-step approach to synthesize various phase-separated porous, raspberry-like, flower-like, core–shell and anomalous nanoparticles and nanocapsules via 1,1-diphenylethene (DPE) controlled soap-free emulsion copolymerization of styrene (S) with glycidyl methacrylate (GMA), or acrylic acid (AA) is reported. By regulating the mass ratio of S/GMA, transparent polymer solution, porous and anomalous P(S-GMA) particles could be produced. The P(S-GMA) particles turn from flower-like to raspberry-like and then to anomalous structures with smooth surface as the increase of divinylbenzene (DVB) crosslinker. Transparent polymer solution, nanocapsules and core–shell P(S-AA) particles could be obtained by altering the mole ratio of S/AA; anomalous and raspberry-like P(S-AA) particles are produced by adding DVB. The unpolymerized S resulted from the low monomer conversion in the presence of DPE aggregates to form nano-sized droplets, and migrates towards the external surfaces of the GMA-enriched P(S-GMA) particles and the internal bulk of the AA-enriched P(S-AA) particles. The nano-sized droplets function as in situ porogen, porous P(S-GMA) particles and P(S-AA) nanocapsules are produced when the porogen is removed. This novel, facile, one-step method with excellent controllability and reproducibility will inspire new strategies for creating hierarchical phase-separated polymeric particles with various structures by simply altering the species and ratio of comonomers. The drug loading and release experiments on the porous particles and nanocapsules demonstrate that the release of doxorubicin hydrochloride is very slow in weakly basic environment and quick in weakly acidic environment, which enables the porous particles and nanocapsules with promising potential in drug delivery applications.

关键词： phase separation 1,1-diphenylethene controlled polymerization porous nanocapsules controlled release

Ground-layer adaptive optics for the New Vacuum Solar Telescope:Instrument description and first results

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Science China(Physics,Mechanics & Astronomy) 2023年第6期66卷 200-210页

作者： Lanqiang Zhang Hua Bao Xuejun Rao Youming Guo Libo Zhong Xian Ran Nanfei Yan Jinsheng Yang Cheng Wang Jiahui Zhou Ying Yang Yunyao Long xinlong fan Zhongyi Feng Donghong Chen Changhui Rao The Key Laboratory on Adaptive Optics Chinese Academy of SciencesChengdu 610209China The Laboratryon Adaptive Optics Institute of Optics and ElectronicsChinese Academyof SciencesChengdu 629China University of Chinese Academy of Sciences Beijing 100049China

Ground-layer adaptive optics(GLAO)has shown its potential for use in solar observation owing to its wide field-of-view(FOV)correction.A high-order GLAO system that consists of a multiple direction Shack-Hartmann wavefront sensor(WFS),a realtime controller with a multi-CPU processor,and a 151-element deformable mirror was developed for the 1-m New Vacuum Solar Telescope at Yunnan Observatories,Chinese Academy of Sciences.A hexagonal microlens with 9×8 subapertures is employed in the *** detection FOV is 42′′×37′′,in which 9(3×3)guide regions are extracted for multiple direction wavefront sensing with a frame rate of up to 2200 *** our knowledge,this is the first professional solar GLAO system used as a regularly operating instrument for scientific *** installation and adjustment were performed in the summer of *** this article,a detailed account of the GLAO system and its first light results and a comprehensive analysis of the performance of the GLAO system are *** results show that this system can effectively improve the imaging quality after compensating for the wavefront aberration due to ground-layer turbulence.

关键词： adaptive and segmented optics solar instruments astronomical observations

High-resolution visible imaging with piezoelectric deformable secondary mirror: experimental results at the 1.8-m adaptive telescope

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Opto-Electronic Advances 2023年第12期6卷 15-26页

作者： Youming Guo Kele Chen Jiahui Zhou Zhengdai Li Wenyu Han Xuejun Rao Hua Bao Jinsheng Yang xinlong fan Changhui Rao The Key Laboratory on Adaptive Optics Chinese Academy of SciencesChengdu 610209China Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China University of Chinese Academy of Sciences Beijing 100049China School of Electronic Electrical and Commutation EngineeringUniversity of Chinese Academy of ScienceBeijing 100049China National Key Laboratory of Optical Field Manipulation Science and Technology Chengdu 610209China.

Integrating deformable mirrors within the optical train of an adaptive telescope was one of the major innovations in astronomical observation technology,distinguished by its high optical throughput,reduced optical surfaces,and the incorporation of the deformable ***,voice-coil actuators are used,which require additional position sensors,internal control electronics,and cooling systems,leading to a very complex *** deformable secondary mirror technologies were proposed to overcome these ***,a high-order piezoelectric deformable secondary mirror has been developed and installed on the 1.8-m telescope at Lijiang Observatory in China to make it an adaptive *** system consists of a 241-actuator piezoelectric deformable secondary mirror,a 192-sub-aperture Shack-Hartmann wavefront sensor,and a multi-core-based real-time *** actuator spacing of the PDSM measures 19.3 mm,equivalent to approximately 12.6 cm when mapped onto the primary mirror,significantly less than the voicecoil-based adaptive telescopes such as LBT,Magellan and *** a result,stellar images with Strehl ratios above 0.49 in the R band have been *** our knowledge,these are the highest R band images captured by an adaptive telescope with deformable secondary ***,we report the system description and on-sky performance of this adaptive telescope.

关键词： adaptive optics deformable secondary mirror visible imaging

EAST-Educational Adaptive-optics Solar Telescope

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Research in Astronomy and Astrophysics 2022年第6期22卷 33-41页

作者： Changhui Rao Xuejun Rao Zhimao Du Hua Bao Cheng Li Jinlong Huang Youming Guo Libo Zhong Qing Lin Xin Ge Jinsheng Yang xinlong fan Yangyi Liu Dan Jia Xin Li Mei Li Ming Zhang Yuntao Cheng Jiahui Zhou Jiawen Yao Lanqiang Zhang Naiting Gu The Institute of Optics and Electronics Chinese Academy of SciencesChengdu 610209China The Key Laboratory on Adaptive Optics Chinese Academy of SciencesChengdu 610209China The University of Chinese Academy of Sciences Beijing 100049China Shanghai Astronomy Museum Shanghai 201306China Sichuan Police College Luzhu 646000China

For the public having a better understanding of solar activities,the Educational Adaptive-optics Solar Telescope(EAST)was built in July 2021 and is located at the Shanghai Astronomy *** EAST consists of a 65 cm aperture solar telescope with a 177-element adaptive optics system and two-channel high resolution imaging system at the Hαand TiO bands,in addition to three full disk solar telescopes at CaK,Hαand TiO bands equipped on the tube of the main *** this paper,the configuration of the EAST is *** performance and on-sky observational results are *** EAST,to our knowledge,is the most advanced solar telescope for the popularization of science in the *** to its excellent performance,the data acquired by the EAST can also be used for research on solar physics and space weather prediction.

关键词： instrumentation adaptive optics-instrumentation high angular resolution-techniques high angular resolution-Sun general

Solar adaptive optics systems for the New Vacuum Solar Telescope at the Fuxian Lake Solar Observatory

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Astronomical Techniques and Instruments 2024年第2期1卷 95-104页

作者： Lanqiang Zhang Xuejun Rao Hua Bao Youming Guo Jinsheng Yang Nanfei Yan Xian Ran Dingkang Tong xinlong fan Zhongyi Feng Changhui Rao National Laboratory on Adaptive Optics Chengdu 610209China The Laboratory on Adaptive Optics Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China University of Chinese Academy of Sciences Beijing 100049China

Adaptive optics(AO)is essential for high-quality ground-based observations with large telescopes because it counters the impact of wavefront aberrations caused by atmospheric *** new vacuum solar telescope(NVST)is one of the most important high-resolution solar observation instruments in the *** sets of solar adaptive optics systems have been developed and installed on this telescope:conventional adaptive optics,ground layer adaptive optics,and multi-conjugate adaptive *** have been in operation from 2018 to *** paper details the development and application of solar adaptive optics on the NVST and discusses the newest instrumentation.

关键词： Solar observation Adaptive optics Multi-conjugate adaptive optics

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一种构建虚拟网络双网卡环境的方法

计算机与数字工程 2011年第10期39卷 198-200页

作者：范新龙西安铁路职业技术学院西安710014

在计算机网络教学过程中,经常会遇到使用双网卡的情况,例如VPN实验、NAT实验,这类实验在实际应用中通常采用物理计算机加装网卡的方法,文章介绍了一种利用虚拟机技术构建双网卡网络环境的方法,并通过对NAT的配置实例,介绍了这种方式的... 详细信息

在计算机网络教学过程中,经常会遇到使用双网卡的情况,例如VPN实验、NAT实验,这类实验在实际应用中通常采用物理计算机加装网卡的方法,文章介绍了一种利用虚拟机技术构建双网卡网络环境的方法,并通过对NAT的配置实例,介绍了这种方式的应用方法。

关键词：虚拟机虚拟网络 NAT

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树莓状粒子的制备及应用研究进展

化学通报 2014年第2期77卷 99-108页

作者：贾向坤范新龙张和鹏张秋禹西北工业大学理学院应用化学系西安710072

树莓状粒子是指具有较大比表面积、表面粗糙度和较高光散射特性的形似树莓的微粒。因其具有特殊的表面形态且表面易于设计,在颗粒自组装、超疏水和超亲水涂层制备方面有广泛的应用。树莓状结构粒子从物质组成上主要分为无机/有机、无机... 详细信息

树莓状粒子是指具有较大比表面积、表面粗糙度和较高光散射特性的形似树莓的微粒。因其具有特殊的表面形态且表面易于设计,在颗粒自组装、超疏水和超亲水涂层制备方面有广泛的应用。树莓状结构粒子从物质组成上主要分为无机/有机、无机/无机和有机/有机复合粒子三种类型。迄今已有多种制备树莓状复合粒子的方法,但由于其组分的千变万化,还没有一种通用的方法。本文总结了近几年树莓状粒子的制备方法及其应用研究进展。

关键词：树莓状表面制备应用