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Hierarchically Crosslinked Gels Containing Hydrophobic Ionic Liquids towards Reliable Sensing Applications

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Chinese Journal of Polymer Science 2020年第4期38卷 332-341,I0005页

作者： Xia-Chao chen Pei-ru Sun Hong-Liang Liu Laboratory of Bio-inspired Smart Interface Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Bio-inspired Smart Interfadal Science and Technology of Ministry of Education and Beijing Advanced Innovation Center for Biomedical Engineering Beihang UniversityBeijing 100191China School of Metallurgy and Materials Engineering Chongqing University of Science and TechnologyChongqing 401331China

Human skin can function steadily regardless of surrounding circumstarices(dry or wet),while it is still a challenge for artificial ionic skins,which tend to release solvents in dry air and leach electrolytes in wetted ***,a series of hierarchically crosslinked ionogels containing hydrophobic ionic liquids(ILs)is fabricated by combining a crystalline fluorinated copolymer with hydrophobic *** a reasonable combination of nonvolatility,transparency,stretchablility,and sensitivity,such ionogels can work as reliable sensors for real-time monitoring huma n motions and operate steadily in complex environments as human skin does,which can contribute to the developme nt of durable sen sing devices with a simple design.

关键词： Ionogels Conductivity Hydrophobicity Strain sensors

A Novel Indoor Positioning Framework

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Computer Modeling in Engineering & Sciences 2022年第3期130卷 1459-1477页

作者： Ming-Chih chen Yin-Ting cheng ru-Wei chen Department of Electronic Engineering National Kaohsiung University of Science and Technology(First Campus)Kaohsiung City82445Taiwan

Current positioning systems are primarily based on the Global Positioning System(GPS).Although the GPS is accurate within 10 m,it is mainly used for outdoor positioning services(Location-Based Service;LBS).However,since satellite signals cannot penetrate buildings,indoor positioning has always been a blind spot for satellite *** indoor positioning applications are extensive with high commercial values,they have created a competitive niche in *** indoor positioning technologies are unable to achieve less than 10 cmaccuracy except for the UltraWide Band(UWB)*** the other hand,the Bluetooth protocol achieves an accuracy of 1 to *** this work,we use Bluetooth wireless signals to build a novel indoor positioning framework to avoid the high manufacturing costs involved in the UWB *** Bluetooth signals are combined with the results from artificial intelligence algorithms to improve *** laboratory indoor location tracking,the accuracy rate is 96%,which provides effective indoor tracking for the movement of people.

关键词： Indoor positioning Bluetooth protocol artificial intelligence

Improve the Accuracy of Fall Detection Based on Artificial Intelligence Algorithm

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Computer Modeling in Engineering & Sciences 2021年第9期128卷 1103-1119页

作者： Ming-Chih chen Yin-Ting cheng ru-Wei chen Department of Electronic Engineering National Kaohsiung University of Science and Technology(First Campus)Kaohsiung City82445Taiwan

This work presents a fall detection system based on artificial *** system incorporates miniature wearable devices for fall *** detection is achieved by integrating a three-axis gyroscope and a threeaxis *** system gathers the differential data collected by the gyroscope and accelerometer,applies artificial intelligence algorithms for model training and constructs an effective model for fall *** provide easywearing and effective position detection,it is designed as a small device attached to the user’*** results have shown that the accuracy of the proposed fall detection model is up to 98%,demonstrating the effectiveness of the model in real-life fall detection.

关键词： Artificial intelligence fall detection miniature sensing device

6-(N,N-Dimethylamino)-2-naphthoylacryl Acid:a Highly Selective and Sensitive Fluorescent Sensor of Copper(Ⅱ)

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Chemical Research in Chinese Universities 2012年第4期28卷 609-613页

作者： XIAO Xu-zhi chen Peng chen He-ru Guangdong Provincal Key Laboratory of Pharmacodynamic Constituents of Tranditional Chinese Medicine and New Drugs Research Institute of Traditional Chinese Medicine and Natural ProductsCollege of PharmacyJinan UniversityGuangzhou 510632P.R.China

A novel fluorescent probe,6-（N,N-dimethylamino）-2-naphthoylacryl acid（ACADAN） was designed and synthesized as a fluorescent sensor for Cu^2＋ in aqueous *** amplification of fluorescence signals without causing any discernible change of maximum fluorescence emission wavelength（λ max） was observed upon the addition of Cu^2＋.Importantly,ACADAN is capable of recognizing Cu^2＋ selectively in aqueous media in the presence of various biologically relevant metal ions and the prevalent toxic metal ions in the environment with high sensitivity（detection limit was 0.1 μmol/L）.

关键词： 6-(N N-Dimethylamino)-2-naphthoylacryl acid Copper(II) Fluorescent sensor Ion recognition Fluorescence enhancement

Study of ss-DNA Adsorption and Nano-mechanical Properties on Mica Substrate with Surface Forces Apparatus

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Chinese Journal of Mechanical Engineering 2018年第5期31卷 91-98页

作者： gui-Bin Shen Ya-Jing Kan Min-Hua chen Yun-Fei chen Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments Southeast University Nanjing 211189 China School of Mechanical Engineering Southeast University Nanjing 211189 China

Many DNA?based devices need to build stable and controllable DNA films on surfaces. However, the most com?monly used method of film characterization, namely, the probe?like microscopes which may destroy the sample and substrate. Surface Forces Apparatus(SFA) technique, specializing in surface interaction studies, is introduced to investigate the e ects of DNA concentration on the formation of single?stranded DNA(ss?DNA) film. The result demonstrates that 50 ng/μL is the lowest concentration that ss?DNA construct a dense layer on mica. Besides, it is also indicated that at di erent DNA concentrations, ss?DNA exhibit diverse morphology: lying flat on surface at 50 ng/μL while forming bilayer or cross?link at 100 ng/μL, and these ss?DNA structures are stable enough due to the repeatabil?ity even under the load of 15 mN/m. At the same time, an obvious adhesion force is measured:/m at 100 ng/μL, respectively, which is attributed to the ion?correlation e ect. M-6.5 mN/m at 50 ng/μL and-5.3 mNoreover, the atomic force microscopy(AFM) images reveal the entire surface is covered with wormlike ss?DNA and the measured surface roughness(1.8±0.2 nm) also matches well with the film thickness by SFA. The desorption behaviors of ss?DNA layer from mica surface occur by adding sodium salt into gap bu er, which is mainly ascribed to the decreased ion?ion cor?relation force. This paper employing SFA and AFM techniques to characterize the DNA film with flexibility and stable mechanical ability achieved by ion bridging method, is helpful to fabricate the DNA?based devices in nanoscale.

关键词： Single?stranded DNA Adsorption Nano?mechanical properties Ion?correlation effect Surface forces apparatus

A nanostructured Ni/T-Nb_(2)O_(5)@carbon nanofibers as a long-life anode material for lithium-ion batteries

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Rare Metals 2021年第2期40卷 374-382页

作者： Si-ru He Jian-Peng Zou Li-Bao chen Yue-Jiao chen State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China

In this work,nickel/T-Nb_(2)O_(5)nanoparticles encapsulated in mesoporous carbon nanofibers(denoted as Ni/T-Nb_(2)O_(5)@CNFs)are successfully prepared through a simple electrospinning route and succedent heating *** presence of Ni in carbon nanofibers is beneficial for enhancing the electronic conductivity and the initial Coulombic ***/T-Nb_(2)O_(5)nanoparticles are homogeneously incorporated in carbon nanofibers to form a nanocomposite system,which provides effective buffering during the lithiation/delithiation process for cycling *** Ni/TNb_(2)O_(5)@CNFs show high surface area(26.321 m^(2)·g^(-1))and mesoporous microstructure,resulting in higher capacity and excellent rate *** Ni/T-Nb_(2)O_(5)@CNFs exhibit a remarkable capacity of 437 mAh·g^(-1)at a current density of0.5 A·g^(-1)after 230 cycles and a capacity of 173 mAh·g^(-1)at a current density up to 10.0 A·g^(-1)after 1400 *** work indicates that nickel/T-Nb_(2)O_(5)nanoparticles encapsulated in carbon nanofibers can be a promising candidate for anode material in high-power LIBs.

关键词： Electrospinning Nickel T-Nb_(2)O_(5) Nanofiber anode Lithium-ion batteries

Development of Biomimetic Synthesis of Propindilactone G

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Chinese Journal of Chemistry 2020年第11期38卷 1339-1352页

作者： Yu Wang Bo chen Xubiao He Jinghan gui CAS Key Laboratory of Synthetic Chemistry of Natural Substances Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of SciencesShanghai 200032China

of main observation and conclusion The natural product propindilactone G is a complex Schisandra nortriterpenoid with a unique 5/5/7/6/5 pentacyclic *** full paper describes the development of concise biomimetic synthesis of propindilactone G from a known steroid *** key C19-OH intermediate was synthesized via Breslow and Suarez radical remote C—H ***-Meerwein rearrangement was subsequently utilized for the expansion of the B *** invert the configuration of the C1O tertiary alcohol,an intramolecular peroxide cyclization catalyzed by BF3-Et2O was *** 5/5 fused lactone system was then assembled in a biomimetic transesterification/oxa-Michael addition *** work should provide experimental support for the proposed biosynthetic pathway and facilitate investigation of the biological activities of pro pindilactone G.

关键词： lactone utilized rearrangement

Hydrothermal Synthesis and Characterization of Perovskite PbTiO_(3) Powders from Different Precursors

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Chemical Research in Chinese Universities 1998年第3期14卷 3-7页

作者： chen Dai-rong XU ru-ren Department of Chemistry Jilin UniversityChangchun130023

Perovskite type of PbTiO 3 fine powders which are homogeneous in physic chemical properties has been hydrothermally synthesized from the different precursors. The borderline reaction conditions, such as temperature and time, for the formation of PbTiO 3 were established and the effect of the precursor on the particle properties was investigated. As a precursor, Pb Ti alko carbonate xerogel dispersed in 2 methoxyethanol was found to be effective for the synthesis of the PbTiO 3 powders with a lower agglomeration and a simple mode of particle size.

关键词： Hydrothermal synthesis PbTiO 3 powders Precursor

Heteroepitaxial Growth of Single-Crystalline Diamond Film

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Chinese Physics Letters 1998年第11期15卷 819-821页

作者： WANG Qi-min chen Qing-gui SHI Ri-hua DONG Rong-kang NI ru-shan ZHU Ji-qian State Key Laboratory of Transducer Technology Shanghai Institute of MetallurgyChinese Academy of SciencesShanghai 200050

Using high temperature heteroepitaxial growth method the single-crystalline diamond film growth conditions have been studied by Raman spectrum and transmission electron *** temperature,low alcohol concentration,slow gas flow velocity,long epitaxial time and substrate located near the gas exit side on the susceptor are the favourable conditions for growing single-crystalline diamond film.

关键词： diffraction. film. epitaxial