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In vitro and in vivo investigation of bacterial cellulose dressing containing uniform silver sulfadiazine nanoparticles for burn wound healing

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Progress in Natural science:Materials International 2015年第3期25卷 197-203页

作者： Xiaoxiao Wen Yudong Zheng Jian Wu Lina Yue Cai Wang Jiabin Luan Zhigu Wu Kaisheng Wang School of Materials science and engineering University of Science and Technology Beijing Suzhou institute of nano-Tech and nano-biobics Chinese Academy of Sciences Hospital Affiliated to Chinese PLA General Hospital

Silver sulfadiazine(SSD) particles in homogeneous dispersion state were prepared by an ultrasonic method and then nano- and microparticles were separated using centrifugation. SSD particles with narrow size distribution were impregnated with bacterial cellulose(BC) to produce BC–SSD composite membrane used as burn wound dressing. A scanning electron microscope(SEM) was used to examine the surface morphology of BC–SSD membranes. The incorporation of SSD in BC–SSD was confirmed by X-ray diffraction(XRD). Antimicrobial tests in vitro indicated that BC–SSD showed excellent antibacterial activity against Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli. The effects of BC–SSD on burn wound healing were assessed by rat models. The comparative study confirmed that the wound treated with BC–SSD showed high healing rate. The bacteria count in BC–SSD group was far less than control group. Histological analysis showed that epithelialization progressed better in wound treated with BC–SSD. These values demonstrated that the BC–SSD composite membrane could be a promising wound dressing for burn.

关键词： Bacterial cellulose Silver sulfadiazine Antibacterial activity Burn wound healing

A non-nucleophilic gel polymer magnesium electrolyte compatible with sulfur cathode

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nano Research 2020年第10期13卷 2749-2754页

作者： Haiyan Fan Yuxing Zhao Jianhua Xiao Jifang Zhang Min Wang Yuegang Zhang School of nano-Tech and nano Bionics University of Science and Technology of ChinaHefei 230026China i-Lab Suzhou Institute of Nano-Tech and Nano BionicsChinese Academy of SciencesSuzhou 215123China Department of Physics Tsinghua UniversityBejing 100084China

Magnesium/sulfur battery(Mg/S)has recently received wide attention due to its high theoretical energy density(3,260 Wh/L)and low *** further improve its safety and flexibility,developing a polymer electrolyte that can be compatible with both electrophilic S and Mg is ***,we report a magnesium chloride-(fluorinated tetraethylene glycolic)borate(MgCl-FTGB)based non-nucleophilic,gel-type polymer electrolyte for Mg/S battery via a facile synthetic method through commercially available *** electrolyte coupled with glass fiber allows reversible Mg deposition/dissolution(100%coulombic efficiency)with low polarization(500μA/cm^2,300/300 mV),and shows a wide electrochemical window of 4.8 V(***/Mg^2+).Mg/S battery assembled with this electrolyte can cycle over 50 times with a high specific discharge capacity retention of over 1,100 mAh/g.

关键词： magnesium/sulfur battery polymer electrolyte non-nucleophilic electrolyte safety

Investigation of high sensitivity radio-frequency readout circuit based on AlGaN/GaN high electron mobility transistor

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Chinese Physics B 2015年第10期24卷 340-343页

作者：张晓渝谭仁兵孙建东李欣幸周宇吕利秦华 Key Laboratory of nanodevices and Applications Suzhou Institute of Nano-tech and Nano-bionicsChinese Academy of Sciences School of Mathematics and Physics Chongqing University of Science and Technology

An Al Ga N/Ga N high electron mobility transistor（HEMT） device is prepared by using a semiconductor nanofabrication process. A reflective radio-frequency（RF） readout circuit is designed and the HEMT device is assembled in an RF circuit through a coplanar waveguide transmission line. A gate capacitor of the HEMT and a surface-mounted inductor on the transmission line are formed to generate LC resonance. By tuning the gate voltage V g, the variations of gate capacitance and conductance of the HEMT are reflected sensitively from the resonance frequency and the magnitude of the RF reflection signal. The aim of the designed RF readout setup is to develop a highly sensitive HEMT-based detector.

关键词： radio-frequency circuit high electron mobility transistor

Study of enhancement-mode GaN pFET with H plasma treated gate recess

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Journal of Semiconductors 2023年第11期44卷 63-68页

作者： Xiaotian Gao Guohao Yu Jiaan Zhou Zheming Wang Yu Li Jijun Zhang Xiaoyan Liang Zhongming Zeng Baoshun Zhang School of Materials science and engineering Shanghai UniversityShanghai 200444China nanofabrication Facility Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China School of nano-Tech and nano-Bionics University of Science and Technology of ChinaHefei 230026China

This letter showcases the successful fabrication of an enhancement-mode(E-mode)buried p-channel GaN fieldeffect-transistor on a standard p-GaN/AlGaN/GaN-on-Si power HEMT *** transistor exhibits a threshold voltage(VTH)of−3.8 V,a maximum ON-state current(ION)of 1.12 mA/mm,and an impressive ION/IOFF ratio of 10^(7).To achieve these remarkable results,an H plasma treatment was strategically applied to the gated p-GaN region,where a relatively thick GaN layer(i.e.,70 nm)was kept intact without aggressive gate *** this treatment,the top portion of the GaN layer was converted to be hole-free,leaving only the bottom portion p-type and spatially separated from the etched GaN surface and gateoxide/GaN *** approach allows for E-mode operation while retaining high-quality p-channel characteristics.

关键词： GaN pFET E-mode H plasma treatment ION/IOFF ratio

Stretchable,self-healing,transient macromolecular elastomeric gel for wearable electronics

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Microsystems & nanoengineering 2019年第1期5卷 583-592页

作者： Mingming Hao Lianhui Li Shuqi Wang Fuqin Sun Yuanyuan Bai Zhiguang Cao Chunyan Qu Ting Zhang i-Lab Key Laboratory of multifunctional nanomaterials and smart systemsSuzhou Institute of Nano-tech and Nano-bionicsChinese Academy of Sciences215123 SuzhouChina nano science and Technology institute University of Science and Technology of China96 Jinzhai Road230026 HefeiAnhuiChina

Flexible and stretchable electronics are emerging in mainstream technologies and represent promising directions for future *** stretchable materials with a self-healing ability to resist mechanical damage are highly desirable but remain challenging to ***,we report a stretchable macromolecular elastomeric gel with the unique abilities of not only self-healing but also transient properties at room *** inserting small molecule glycerol into hydroxyethylcellulose(HEC),forming a glycerol/hydroxyethylcellulose(GHEC)macromolecular elastomeric gel,dynamic hydrogen bonds occur between the HEC chain and the guest small glycerol molecules,which endows the GHEC with an excellent stretchability(304%)and a self-healing ability under ambient ***,the GHEC elastomeric gel is completely water-soluble,and its degradation rate can be tuned by adjusting the HEC molecular weight and the ratio of the HEC to *** demonstrate several flexible and stretchable electronics devices,such as self-healing conductors,transient transistors,and electronic skins for robots based on the GHEC elastomeric gel to illustrate its multiple functions.

关键词： healing transient wear

The effect of the boron-ions implantation on the performance of RADFETs

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science China(Technological sciences) 2016年第11期59卷 1785-1790页

作者： LIU HongRui WANG ShuaiMin ZHANG JinWen institute of Microelectronics Peking University National Key Laboratory of science and Technology on Micro/nano Fabrication Peking University

In this work, we studied on the boron-ions implantation, including the implant dose and post-annealing temperature on the performance of PMOS radiation field-effect transistors(RADFETs) in experimental. The possible traps and defects induced by ions implantation in the gate-oxide and their further impacting on the sensitivity and dose range of RADFETs were analyzed qualitatively. Our devices had the dry/wet/dry sandwich gate-oxide of 420 nm thick. Different ion-implanting doses and post-annealing temperatures were carried out during the RADFETs fabrication. We built a real time auto-measurement system to realize the auto-state-switch between irradiation and read-out modes, and in-situ measurement of output voltage for ten devices in turn at once of radiation experiment. The threshold voltage, dose range and sensitivity of RADFETs were extracted and analyzed in detail. The results showed that the highest sensitivity of 229 mV/Gy achieved when the implant dose was2.2×1011 cm.2 and the post-annealing temperature was 1000°C, and the dose range of 34 Gy as well.

关键词： dosimeters PMOS RADFETs implant dose post-annealing temperature real time auto-measurement system radiation effects

Multi-modal anti-counterfeiting and encryption enabled through silicon-based materials featuring pH-responsive fluorescence and room-temperature phosphorescence

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nano Research 2020年第6期13卷 1614-1619页

作者： Jinhua Wang Bin Song Jiali Tang Guyue Hu Jingyang Wang Mingyue Cui Yao He Laboratory of nanoscale Biochemical Analysis Institute of Functional Nano and Soft Materials(FUNSOM)and Collaborative Innovation Center of Suzhou Nano Science and TechnologySoochow UniversitySuzhou215123China

nano Research volume 13,pages1614–1619(2020)Cite this article 236 Accesses Metrics details Abstract Optical silicon(Si)-based materials are highly attractive due to their widespread applications ranging from electronics to *** is worth noting that while extensive efforts have been devoted to developing fluorescent Si-based structures,there currently exist no examples of Si-based materials featuring phosphorescence emission,severely limiting Si-based wide-ranging optical *** address this critical issue,we herein introduce a kind of Si-based material,in which metal-organic frameworks(MOFs)are in-situ growing on the surface of Si nanoparticles(SiNPs)assisted by microwave *** particular significance,the resultant materials,i.e.,MOFs-encapsulated SiNPs(MOFs@SiNPs)could exhibit pH-responsive fluorescence,whose maximum emission wavelength is red-shifted from 442 to 592 nm when the pH increases from 2 to *** importantly,distinct room-temperature phosphorescence(maximum emission wavelength:505 nm)could be observed in this system,with long lifetime of 215 *** advantages of above-mentioned unique optical properties,the MOFs@SiNPs are further employed as high-quality anti-counterfeiting inks for advanced *** comparison to conventional fluorescence anti-counterfeiting techniques(static fluorescence outputs are generally used,thus being easily duplicated and leading to counterfeiting risk),pH-responsive fluorescence and room-temperature phosphorescence of the resultant MOFs@SiNPs-based ink could offer advanced multi-modal security,which is therefore capable of realizing higher-level information security against counterfeiting.

关键词： silicon nanohybrids pH-responsive fluorescence room-temperature phosphorescence multi-modal anti-counterfeiting

Fe3O4 nanoparticles impregnated eggshell as a novel catalyst for enhanced biodiesel production

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Chinese Journal of Chemical engineering 2019年第11期27卷 2835-2843页

作者： Ch.Chingakham Asha David V.Sajith School of nano science and Technology National Institute of Technology CalicutIndia Malabar Christian College CalicutIndia

Biodiesel is a green fuel which can replace diesel while addressing various issues such as scarcity of hydrocarbon fuels and environmental pollution to an extent. The high production cost of biodiesel and the recovery of the catalyst after the transesterification process are the major challenges to be addressed in biodiesel production. In the present work, a cheap and promising solid base oxide catalyst was synthesized from chicken eggshell by calcination at 900 ℃ forming catalyst eggshells(CES) and was impregnated with the nanomagnetic material(Fe3O4) to obtain Fe3O4 loaded catalytic eggshell(CES–Fe3O4). Fe3O4 nanomaterials were synthesized by co-precipitation method and were loaded in catalytic eggshell by sonication, for better recovery of the catalyst after transesterification process. CES–Fe3O4 material was characterized by Thermogravimetric analysis, X-ray diffraction, Fourier transform infrared spectroscopy, a vibrating-sample magnetometer, Brunauer-Emmett-Teller, Dynamic light scattering, and Scanning electron microscopy. Biodiesel was synthesized by transesterification of Pongamia pinnata raw oil with 1:12 oil to methanol molar ratio and 2 wt% catalyst loading for 2 h at a temperature of 65 ℃ and yields were compared. The reusability of the catalyst was studied by the transesterification of the raw oil and its catalytic activity was found to be retained up to 7 cycles with a yield of 98%.

关键词： Catalyst Biodiesel nanoparticles Fe3O4 Impregnation Transesterification

Vertical two-dimensional WS_(2)flakes grown on flexible CNT film for excellent electrochemical performance

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Rare Metals 2024年第1期43卷 164-174页

作者： Qian Gong Jing-Yun Zou Ming Ren Si-Qi Zhu Yu-Rong Zhou Li-Ming Zhao Jian Chen Yu-Long Wu Jiang-Tao Di Li-Xing Kang Qing-Wen Li School of nano-Tech and nano-Bionics University of Science and Technology of ChinaHefei 230026China Key Laboratory of Multifunctional nanomaterials and Smart Systems Division of Advanced MaterialsSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Jiangsu Key Laboratory of Micro and nano Heat Fluid Flow Technology and Energy Application School of Physical Science and TechnologySuzhou University of Science and TechnologySuzhou 215009China

Soft electrochemical actuators that can generate mechanical motions in response to electrical stimuli can be used as artificial muscles in microscale *** electrode materials are the key component of the electrochemical actuator because they limit the ion diffusion and accumulation processes and thus affect the deformation in fast response-time and potential engineering ***-dimensional materials,such as one-dimensional(1D)CNT and two-dimensional(2D)vertically stood WS_(2),are great electrode due to their good electrochemical stability and high surface-to-volume ratios,but show limited performances when being used on their own in the actuators because of low reconstruction or low conductivity.A combination of 1D CNT and 2D WS_(2)could form a heterojunction with both high electrochemical activity and great mechanical ***,by depositing highly disordered graphene nanosheets(HDGNs)on CNT films and then WS_(2)on the formed low-dimensional nanocarbon film,a hybrid WS_(2)/HDGN/CNT film was synthesized through a multistep CVD *** grown WS_(2)nanosheets were achieved by taking advantage of HDGNs which limits CNTs ***,the volume expansion caused by the transition from WO_(3)to WS-2can force the vertical growth of WS_(2).This hybrid film shows excellent electrochemical properties,such as high specific capacitance and high rate *** actuators based on the WS_(2)/HDGN/CNT films show good actuating performance,including stability and reconfigurability.

关键词： CNT Graphene Vertically growth WS_(2) Electrochemical actuators