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Nanosilver anchored alginate/poly(acrylic acid/acrylamide) double-network hydrogel composites for efficient catalytic degradation of organic dyes

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Frontiers of Chemical Science and Engineering 2023年第7期17卷 893-905页

作者： Fan Zhang Ce Gao Shang-Ru Zhai Qing-Da An Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials Liaoning Collaborative Innovation Center for Lignocellulosic BiorefineryCollege of Light Industry and Chemical EngineeringDalian Polytechnic UniversityDalian 116034China

A novel alginate/poly(acrylic acid/acrylamide)double-network hydrogel composite with silver nanoparticles was successfully fabricated using the sol–gel *** presence of carboxyl and amide groups in the network structure provided abundant active sites for complexing silver ions,facilitating the in situ reduction and confinement of silver *** batch experiments,the optimal silver loading was 20%,and 5 mmol·L^(–1) of p-nitrophenol was completely degraded in 113 s with a rate constant value of 4.057×10^(−2) s^(–1).In the tap water system and simulated seawater system,the degradation time of p-nitrophenol at the same concentration was 261 and 276 s,respectively,with a conversion rate above 99%.In the fixed-bed experiment,the conversion rate remained above 74%after 3 h at a flowing rate of 7 mL·min^(–1).After 8 cycling tests,the conversion rate remained at 98.7%.Moreover,the catalyst exhibited outstanding performance in the degradation experiment of four typical organic dyes.

关键词： double-network hydrogel dye degradation silver nanoparticles alginate

Interface sintering engineered superhydrophobic and durable nanofiber composite for high-performance electromagnetic interference shielding

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Journal of Materials Science & Technology 2022年第3期98卷 62-71页

作者： Lulu Zhang Junchen Luo Shu Zhang Jun Yan Xuewu Huang Ling Wang Jiefeng Gao School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China State Key Laboratory of Polymer Materials Engineering Sichuan UniversityChengdu 610065China Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education Hangzhou Normal UniversityHangzhou 311121China

Electrically conductive fibric composites(CFCs)have been widely used as electromagnetic interference(EMI)shielding materials;however,it is still difficult to achieve combination of strong interfacial adhesion,outstanding water proof performance,multi-functionality and superb EMI shielding performance for the ***,we report a novel“photo-thermally induced interfacial sintering”method to prepare flexible and superhydrophobic CFCs with excellent interfacial *** CFC possesses dual conductive network composed of carbon nanofiber and silver nanoparticles(Ag NPs),and a conductivity of 112.1 S/cm,imparting to the material excellent Joule heating performance,revealing an large SE and SSE(59.4 dB and 333.9 dB mm^(-1))of the CFC in the X band,*** addition,the CFC can maintain its superhydrophobicity,high conductivity and excellent EMI shielding performance after cyclic abrasion,stretching and ultrasonication ***“interfacial sintering”strategy provides a new way to fabricating multi-functional and durable conductive polymer composite.

关键词： Carbon nanofibers silver nanoparticles Superhydrophobic Conductive Electromagnetic interference shielding

Antimicrobial Expanded Polytetrafluoroethylene Film Prepared by 3-ray Radiation Induced Grafting of Poly（acrylic acid）

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Chinese Journal of Chemical Physics 2015年第1期28卷 107-112,I0002页

作者：王运龙汪谟贞吴启超周晓葛学武中国科学院软物质化学重点实验室、中国科学技术大学高分子材料科学与工程系合肥230026 广东天安新材料股份有限公司佛山528000

The simultaneous γ-ray-radiation-induced grafting polymerization of acrylic acid on ex- panded polytetrafluoroethylene （ePTFE） film was investigated. It was found that the degree of grafting （DG） of poly（acrylic acid）（PAA） can be controlled by the monomer concentration, absorbed dose, and dose rate under an optimal inhibitor concentration of [Fe2＋]=18 mmol/L. SEM observation showed that the macroporous structure in ePTFE films would be covered gradually with the increase of the DG of PAA. The prepared ePTFE-g-PAA film was im- mersed in a neutral silver nitrate solution to fabricate an ePTFE-g-PAA/Ag hybrid film after the addition of NaBH4 as a reduction agent of Ag＋ to Ag atom. SEM, XRD, and XPS results proved that Ag nanoparticles with a size of several tens of nanometers to 100 nanometers were in situ immobilized on ePTFE film. The loading capacity of Ag nanoparticles could be tuned by the DG of PAA, and determined by thermal gravimetric analysis. The quart- titative antibacterial activity of the obtained ePTFE-g-PAA/Ag hybrid films was measured using counting plate method. It can kill all the Escherichia coli in the suspension in 1 h. Moreover, this excellent antibacterial activity can last at least for 4 h. This work provides a facile and practical way to make ePTFE meet the demanding antimicrobial requirement in more and more practical application areas.

关键词： Expanded polytetrafluoroethylene film Radiation grafting Poly(acrylic acid) silver nanoparticles Antibacterial property

Structural and luminescence enhancement properties of Eu^(3+)/Ag nanocrystallites doped SiO_2-TiO_2 matrices

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Journal of Rare Earths 2013年第5期31卷 441-448页

作者： Arun Kumar K V Revathy K P Prathibha Vasudevan Sunil Thomas Biju P R Unnikrishnan N V School of Pure & Applied Physics Mahatma Gandhi University

We reported here the structural and optical characterisation of silver nanocrystallites/Eu3＋：SiO2-TiO2 matrices synthesised through sol-gel route. Structural characterisations were done by using energy dispersive spectroscopy （EDX）, X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FTIR）, atomic force microscope （AFM） and transmission electron microscopy （TEM） measurements and optical characterisations were performed by absorption and emission spectroscopy. The TEM and XRD measurements confirmed the presence of nanocrystals. A broad absorption band was observed due to surface plasmon resonance of silver nanocrystals. The effect of silver nanocrystals on the emission spectrum of Eu3＋ doped SiO2-TiO2 matrices was discussed. An attempt was made to explain this fluorescence enhancement by invoking phenomena such as energy transfer, asymmetry ratio, surface plasmon, surface roughness, crystallinity and grain boundary. Our analysis, based on the experimental results, suggested that all the phenomena except crystallinity and grain boundary had favourable effects on fluorescence enhancement. We also estimated the relevant parameters associated with the phenomena that affected the fluorescence emission from the Eu3＋ ions in the matrix. It was seen that the theoretical estimate of fluorescence enhancement agreed well with the experimental estimate.

关键词： sol-gel luminescence SiO2-TiO2 silver nanoparticles rare earths

Impact of density of coating agent on antibacterial activity of silver nanoparticle impregnated plasma treated activated carbon

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Journal of Environmental Sciences 2018年第5期30卷 136-144页

作者： Pritam Biswas Rajdip BANDyopadhyaya Department of Chemical Engineering Indian Institute of Technology Bombay

To use stabilized nanoparticles（NPs） in water as disinfectants over a very long period, the amount of coating agent（for NP stabilization） needs to be optimized. To this end, silver nanoparticles（Ag-NPs） with two different coating densities of tri-sodium citrate（12.05 and46.17 molecules/nm2, respectively）, yet of very similar particle size（29 and 27 nm, respectively）were synthesized. Both sets of citrate capped NPs were then separately impregnated on plasma treated activated carbon（AC）, with similar Ag loading of 0.8 and 0.82 wt.%, respectively. On passing contaminated water（containing 10~4 CFU Escherichia coli/m L of water） through a continuous flow-column packed with Ag/AC, zero cell concentration was achieved in 22 and 39 min, with Ag-NPs（impregnated on AC, named as Ag/AC） having lower and higher coating density, respectively. Therefore, even on ensuring similar Ag-NP size and loading, there is a significant difference in antibacterial performance based on citrate coating density in Ag/*** is observed in lower coating density case, due to both：（i） higher Ag~＋ ion release from Ag-NP and（ii） stronger binding of individual Ag-NPs on AC. The latter ensures that, Ag-NP does not detach from the AC surface for a long duration. TGA-DSC shows that Ag-NPs with a low coating density bind to AC with 4.55 times higher adsorption energy, compared to Ag/AC with a high coating density, implying stronger binding. Therefore, coating density is an important parameter for achieving higher antibacterial efficacy, translating into a faster decontamination rate in experiments, over a long period of flow-column operation.

关键词： silver nanoparticles Activated carbon Escherichia coliCitrate coating Coating density Water disinfection

In situ biosynthesized silver nanoparticle-incorporated synthesized zeolite A using Orthosiphon aristatus extract for in vitro antibacterial wound healing

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Particuology 2022年第8期20卷 27-34页

作者： Muhammad Hariz Asraf Nor Suriani Sani Craig Denver Williams Khairunadwa Jemon Nik Ahmad Nizam Nik Maliek Department of Biosciences Faculty of ScienceUniversiti Teknologi Malaysia81310 SkudaiJohorMalaysia Office of Deputy Vice Chancellor(Research and Innovation) Universiti Teknologi Malaysia81310 UTM SkudaiJohorMalaysia University of Wolverhampton Wulfuna StreetWolverhampton WV11SBEnglandUK Centre for Sustainable Nanomaterials(CSNano) Ibnu Sina Institute for Scientific and Industrial Research(ISI-SIR).Universiti Teknologi Malaysia81310 SkudaiJohorMalaysia

The capability of synthesized zeolite A(SZ)to immobilize Ag ions(Ag-SZ)and Ag nanoparticles(AgNp-SZ)were comparatively studied.A novel approach of in situ biosynthesized AgNP-incorporated synthesized zeolite A(AgNp-SZ)was synthesized at an optimum volume of 0.4mL of the Orthosiphon aristatus(***)leaves plant extract(5%)using an in situ *** comparison,Ag-Sz was produced by loading the synthesized zeolite with Ag *** synthesized materials were characterized for their morphologies and *** characterization analysesvalidate thathe biosynthesized AgNP(<100 nm)using *** leaves extract was incorporated into the zeolite *** antibacterial testing confirmed that these materials have antibacterial activity against Escherichia coliATCC11229 and Staphylococcus aureus ATCC ***/MBC analysis demonstrated that in 0.9%saline solution,AgNP-SZ had higher antibacterial activity than *** in vitro cell viability and migration assays were further examined towards human skin fibroblast cells HSF *** show that the materials are not cytotoxicto HSF1184,and the biosynthesized AgNP-SZ promotes cell migration and proliferation higher than *** research proved that the biocompatible antibacterial wound healing agent of AgNP-SZ can be synthesized using an in situ approach where the reduction process of Ag ions in the zeolite Acan be performed using plant extract.

关键词： Zeolite Orthosiphon aristatus Biosynthesis silver nanoparticles Antibacterial In vitro wound healing

Electrochemical Behavior and Specific Capacitance of Polyaniline/silver Nanoparticle/Multi-walled Carbon Nanotube Composites

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Chinese Journal of Chemical Physics 2014年第6期27卷 718-724,I0004页

作者：李嘉张迪郭金宝魏杰北京化工大学材料科学与工程学院北京100029

In this work, we fabricated the polyaniline/silver nanoparticle/multi-walled carbon nanotube （PANI/Ag/MWCNT） composites by in situ polymerization of aniline on the wall of Ag/MWCNTs with different aniline to Ag/MWCNT mass ratios. The chemical structure of the ternary composites was characterized by Fourier transform infrared spectroscopy, Xray diffraction, and X-ray photoelectron spectroscopy. Scanning electron microscope and high-resolution transmission electron microscopy were used to observe the morphology of the ternary composites. The results showed that the polyaniline PANI layer was prepared successfully and it covered Ag/MWCNTs completely. In addition, Ag nanoparticles between the MWCNT core and the PANI layer existed in the form of elemental crystal, which could contribute to the electrochemical performance of the composites. Then we prepared the composite electrodes and studied their electrochemical behaviors in 1 mol/L KOH. It was found that these composite electrodes had very low impedance, and exhibited lower resistance, higher electrochemical activity, and better cyclic stability compared with pure PANI electrode. Particularly, when the mass ratio of aniline to Ag/MWCNTs was 5：5, the composite electrode displayed a small equivalent series resistance （0.23 Ω） and low interfacial charge transfer resistance （〈0.25 Ω）, as well as 160 F/g of the maximum specific capacitance at a current density of 0.25 A/g in KOH solution. We could conclude that the composite material had potential applications as cathode materials for lithium batteries and supercapacitors.

关键词： Carbon nanotubes silver nanoparticles Polyaniline Electrochemical behaviors

Embedding variable micro-capacitors polydimethylsiloxane for enhancing output of triboelectric nanogenerator in power

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Nano Research 2017年第1期10卷 320-330页

作者： Xiaona Xia Jie Chen Hengyu Guo Guanlin Liu Dapeng Wei Yi Xi Xue Wang Chenguo Hu Department of Applied Physics Chongqing University Chongqing 400044 China Chongqing Key Laboratory of Multi-scale Manufacturing Technology Chongqing Institute of Green and Intelligent Technology Chinese Academy of 5ciences Chongqing 400714 China

Polydimethylsiloxane （PDMS） is an excellent material for investigating the mechanism of triboelectricity as it can easily be used to construct various microstructures. In this study, micro-capacitors （MCs） and variable microcapacitors （VMCs） were embedded in PDMS by filling PDMS with silver nanoparticles （NPs） and constructing an internal cellular structure. The output performance of the triboelectric nanogenerators （TENGs） based on MCs@PDMS and VMCs@PDMS films was systematically investigated, with variation of the filling content of silver NPs and the pore ratio and size. The microstructure, permittivity, dielectric loss, and capacitance of the VMCs@PDMS films were well characterized. The output current of the TENG based on the VMCs@PDMS film was respectively 4.0 and 1.6 times higher than that of the TENGs based on the pure PDMS film and MCs@PDMS film, and the output power density of the former reached 6 W·m-2. This study sheds light on the physical nature of conductive nanoparticle fillings and cellular structures in dielectric triboelectric polymers.

关键词： cellular structure polydimethylsiloxane silver nanoparticles variable micro-capacitor

Facile fabrication of highly conductive, waterproof, and washable e-textiles for wearable applications

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Nano Research 2021年第4期14卷 1043-1052页

作者： Ben Niu Su Yang Tao Hua Xiao Tian MingKin Koo Nanotechnology Center Institute of Textiles&ClothingThe Hong Kong Polytechnic UniversityHung HornHong Kong 999077China

曰ectronic textiles(e-textiles),known as a newly-developed innovation combining the textile and electronic technologies,are burgeoning as the next-generation of wearable electronics for lots of promising ***,a big concern is the durability of the e-textiles during practical ***,we describe a facile method tofabricate mechanically and electrically durable e-textiles by chemical deposition of silver nanoparticles(AgNPs)on widely used cotton *** interface between AgNPs and fabric was tightly strengthened by the bioinspired polydopamine,and a highly waterproof and anticorrosive surface was further obtained by modifying with a fluorine containing agent of 1H,1H,2H,2/~/-perfuorodecanethiol(PFDT).In addition to the low sheet resistance of 0.26 ohm/sq and high conductivity of 233.4 S/cm,the e-textiles present outstanding stability to different mechanical deformations including ultrasonication,bending and machine ***,thanks to the surface roughness of AgNPs and low surface energy of PFDT,a superhydrophobic surface,with a water contact angle of ca.152°,was further obtained,endowing the e-textiles excellent anti-corrosion to water,acid/alkaline solution and various liquids(e.g.,milk,coffee and tea).Finally,the application of this highly conductive e-textiles in wearable thermal therapy is *** with the facile,all-solution-based,and environmentally friendly fabrication protocol,the e-textiles show great potential of large-scale applications in wearable electronics.

关键词： electronic textiles silver nanoparticles washability waterproof