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Effect of Pd Ions on the Generation of Ag and Au Heterogeneous Nanoparticles Using Laser Ablation in Liquid. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11041394] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Heterogeneous Ag/Au nanoparticles combined with Pd ions were generated by irradiating Ag/Au metal targets in a Pd solution with nanosecond and femtosecond lasers. AgPd and AuPd nanoparticles were generated by laser fragmentation and bonded. We numerically analyzed the hot spots with electromagnetic field enhancement of nanoparticles of different sizes separated by various distances. AgPd and AuPd nanoparticles differing in diameter were generated and showed different characteristics compared to typical core-shell heterogeneous nanoparticles. Pd ions played an important role in the generation of nanoparticles in liquid via laser ablation. The femtosecond laser produced both pure and heterogeneous nanoparticles of uniform size. The nanosecond laser produced pure nanoparticles with a relatively non-uniform size, which developed into spherical heterogeneous nanoparticles with a uniform (small) size in the presence of Pd ions. These nanoparticles could optimize applications such as photothermal therapy and catalysis.
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Zhang Y, Mustapha AN, Zhang X, Baiocco D, Wellio G, Davies T, Zhang Z, Li Y. Improved volatile cargo retention and mechanical properties of capsules via sediment-free in situ polymerization with cross-linked poly(vinyl alcohol) as an emulsifier. J Colloid Interface Sci 2020; 568:155-164. [PMID: 32088446 DOI: 10.1016/j.jcis.2020.01.115] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 01/27/2020] [Accepted: 01/28/2020] [Indexed: 10/25/2022]
Abstract
HYPOTHESIS It is hypothesized that poly(vinyl alcohol) (PVOH) as an emulsifier destabilizes the insoluble molecular aggregates by increasing interparticle interactions and their tendency toward agglomeration into large particle aggregates during the encapsulation process of one-step in situ polymerization. Porosity of capsule shells is expected to decrease with reducing agglomeration tendency to allow dense packing of smaller insoluble aggregates. Cross-linking the polymer network further reduces shell permeability to improve the retention of volatile cargos. PVOH also modifies the short-range order of polymer network to bestow improved mechanical properties in addition to the shell thickening effect at appropriate synthesis conditions. EXPERIMENTS PVOH was used to stabilize a heptane-in-water emulsion as a template for producing capsules via one-step in situ polymerization. Shell morphologies at different PVOH concentrations were compared. Physical freeze-thawing and chemical cross-linking were adopted separately to synthesize capsules with a volatile cargo, and its retention was characterized qualitatively by a solvatochromism-based fluorescent method and quantitative payload calculation. Mechanical properties of capsules were tested with micromanipulation. The effect of graphene oxide (GO) impregnation into capsules was studied with various co-emulsifiers. FINDINGS When PVOH alone was used as the emulsifier for capsule synthesis, the higher its concentration, the more porous the shell structure was. At very low concentrations, visible pores were eliminated. Freeze-thaw cycles reduced the permeability of capsule shells when visible pores were absent. Chemical cross-linking with poly(acrylic acid) (PAA) significantly improved the retention of volatile cargo heptane. PVOH substantially reduced polymer sediment during capsule synthesis, which eliminated the tedious centrifugation procedure that normally would have followed. Superior mechanical strength of capsules was achieved with PAA cross-linked PVOH at appropriate conditions. The impregnation of aqueously dispersed GO into capsules was also promoted by using PVOH but not hydrocolloid emulsifiers.
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Affiliation(s)
- Yan Zhang
- Birmingham Centre for Energy Storage (BCES), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom; Micromanipulation and Microencapsulation Research Group (MCAP), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Abdullah Naseer Mustapha
- Birmingham Centre for Energy Storage (BCES), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom; Micromanipulation and Microencapsulation Research Group (MCAP), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Xiaotong Zhang
- Micromanipulation and Microencapsulation Research Group (MCAP), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Daniele Baiocco
- Micromanipulation and Microencapsulation Research Group (MCAP), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Gilmore Wellio
- Birmingham Centre for Energy Storage (BCES), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom; Micromanipulation and Microencapsulation Research Group (MCAP), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom
| | - Thomas Davies
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff, Wales CF10 3AT, United Kingdom
| | - Zhibing Zhang
- Micromanipulation and Microencapsulation Research Group (MCAP), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom.
| | - Yongliang Li
- Birmingham Centre for Energy Storage (BCES), School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham, West Midlands B15 2TT, United Kingdom.
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Radosavljević A, Spasojević J, Krstić J, Kačarević-Popović Z. Nanocomposite Hydrogels Obtained by Gamma Irradiation. POLYMERS AND POLYMERIC COMPOSITES: A REFERENCE SERIES 2019. [DOI: 10.1007/978-3-319-77830-3_21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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4
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Fabrication of silver nanoparticles in titanium dioxide/poly(vinyl alcohol) alternate thin films: A nonenzymatic hydrogen peroxide sensor application. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.08.125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Arvinte A, Crudu IA, Doroftei F, Timpu D, Pinteala M. Electrochemical codeposition of silver-gold nanoparticles on CNT-based electrode and their performance in electrocatalysis of dopamine. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.10.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Highly selective hydrogenation of α-pinene in aqueous medium using PVA-stabilized Ru nanoparticles. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2017.10.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Weng G, Huang Y, Thanneeru S, Li H, Alamri A, He J. Cross-linking of COOH-containing polymers using Ag(i)-catalyzed oxidative decarboxylation in aqueous solution. SOFT MATTER 2017; 13:5028-5037. [PMID: 28657101 DOI: 10.1039/c7sm00825b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cross-linking that defines the three-dimensional networks in hydrogels has a significant impact on their physiochemical properties. The cross-linking of hydrophilic polymers via post-polymerization reactions is an ideal way to manufacture hydrogels with high reproducibility and without monomer residuals. We herein report the use of Ag(i)-catalyzed oxidative decarboxylation to cross-link poly(acrylic acid) (PAA) and a family of COOH-containing hydrophilic polymers. Our method is based on the radical-mediated elimination reaction to remove COOH group(s) and generate alkyl radical(s) simultaneously, in the presence of AgNO3 and persulfates. The further intermolecular radical coupling is demonstrated to be very effective in inducing cross-linking and gelation of COOH-containing hydrophilic polymers. The cross-linking reaction can be readily achieved by simply mixing a small amount of AgNO3 (as low as 0.03 wt%) and persulfates with polymers at room temperature in air. Rheological measurements show that the gelation occurs in 20-30 min. The applications of oxidative decarboxylation in the preparation of hydrogels of COOH-containing hydrophilic copolymers and their interpenetrating polymer network (IPN) hydrogels are further validated. Finally, the residual Ag(i) ions in hydrogels are discussed in terms of how Ag(i) ions further change the mechanical and optical properties of hydrogels by photoreduction of Ag(i) to Ag nanoparticles. We expect that this Ag(i)-catalyzed oxidative decarboxylation chemistry can not only serve as a facile and general strategy to produce hydrogels through post-polymerization, but also enrich the toolbox of cross-linking chemistries of COOH-containing polymers in all forms (e.g. films, colloids and dispersions).
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Affiliation(s)
- Gengsheng Weng
- School of Materials and Chemical Engineering, Ningbo Key Laboratory of Specialty Polymers, Ningbo University, Ningbo, 315211, China and Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA.
| | - Yu Huang
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA. and College of Pharmacy, Ningxia Medical University, Yinchuan, 750004, China
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA.
| | - Hongqiang Li
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA. and College of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China
| | - Abdullah Alamri
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA.
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA. and Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
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Ali IO, Salama TM, Mohamed MI, Ghazy MBM, Bakr MF. Synthesis and characterization of Ag nanoparticles embedded in PVA via UV-photoreduction technique for synthesis of Prussian blue pigment. IRANIAN POLYMER JOURNAL 2017. [DOI: 10.1007/s13726-017-0540-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Shen H, Wang Z, Wu Y, Yang B. One-dimensional photonic crystals: fabrication, responsiveness and emerging applications in 3D construction. RSC Adv 2016. [DOI: 10.1039/c5ra21373h] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Classical usages of one-dimensional photonic crystals and emerging applications in 3D construction.
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Affiliation(s)
- Huaizhong Shen
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun
- P. R. China
| | - Zhanhua Wang
- Laboratory of Organic Chemistry
- Wageningen University and Research Center
- The Netherlands
| | - Yuxin Wu
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun
- P. R. China
| | - Bai Yang
- State Key Laboratory of Supramolecular Structure and Materials
- College of Chemistry
- Jilin University
- Changchun
- P. R. China
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Bera A, Garai P, Singh R, Prakash Gupta P, Malav S, Singh D, Kumar D, Tiwari B, Vaijapurkar S. Gamma radiation synthesis of colloidal AgNPs for its potential application in antimicrobial fabrics. Radiat Phys Chem Oxf Engl 1993 2015. [DOI: 10.1016/j.radphyschem.2015.05.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Mishra NK, Joshi KB, Verma S. Modulating peptide amphiphile morphology by gold nanocolloids. J Colloid Interface Sci 2015; 455:145-53. [DOI: 10.1016/j.jcis.2015.05.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 05/11/2015] [Accepted: 05/12/2015] [Indexed: 12/26/2022]
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12
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Dual responsive antibacterial Ag-poly(N-isopropylacrylamide/itaconic acid) hydrogel nanocomposites synthesized by gamma irradiation. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.06.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Nanocomposites Based on Thermoplastic Polymers and Functional Nanofiller for Sensor Applications. MATERIALS 2015. [PMCID: PMC5455710 DOI: 10.3390/ma8063377] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Thermoplastic polymers like polyolefins, polyesters, polyamide, and styrene polymers are the most representative commodity plastics thanks to their cost-efficient manufacturing processes, excellent thermomechanical properties and their good environmental compatibility, including easy recycling. In the last few decades much effort has been devoted worldwide to extend the applications of such materials by conferring on them new properties through mixing and blending with different additives. In this latter context, nanocomposites have recently offered new exciting possibilities. This review discusses the successful use of nanostructured dispersed substrates in designing new stimuli-responsive nanocomposites; in particular, it provides an updated description of the synthetic routes to prepare nanostructured systems having the typical properties of thermoplastic polymers (continuous matrix), but showing enhanced optical, conductive, and thermal features dependent on the dispersion topology. The controlled nanodispersion of functional labeled clays, noble metal nanoparticles and carbon nanotubes is here evidenced to play a key role in producing hybrid thermoplastic materials that have been used in the design of devices, such as NLO devices, chemiresistors, temperature and deformation sensors.
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Shen H, Wu Y, Fang L, Ye S, Wang Z, Liu W, Cheng Z, Zhang J, Wang Z, Yang B. From 1D to 3D: a new route to fabricate tridimensional structures via photo-generation of silver networks. RSC Adv 2015. [DOI: 10.1039/c4ra17258b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A time-saving and low-cost method is established to construct stacked 3D structures through the combination of bottom-up and top-down techniques which enables us to create building blocks freely and to precisely adjust the matrix feature.
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15
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Ali IO. Synthesis and characterization of Ag0/PVA nanoparticles via photo- and chemical reduction methods for antibacterial study. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.08.032] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Al-Hosiny NM, Abdallah S, Moussa MAA, Badawi A. Optical, thermophysical and electrical characterization of PMMA (CdSe QDs) composite films. JOURNAL OF POLYMER RESEARCH 2013. [DOI: 10.1007/s10965-013-0076-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Liu J, Zhang X, Yu M, Li S, Zhang J. Photoinduced silver nanoparticles/nanorings on plasmid DNA scaffolds. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:310-6. [PMID: 22102552 DOI: 10.1002/smll.201101423] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 09/26/2011] [Indexed: 05/24/2023]
Abstract
Biological scaffolds are being actively explored for the synthesis of nanomaterials with novel structures and unexpected properties. Toroidal plasmid DNA separated from the Bacillus host is applied as a sacrificial mold for the synthesis of silver nanoparticles and nanorings. The photoirradiation method is applied to reduce Ag(I) on the plasmid. The nanoparticles are obtained by varying the concentration of the Ag(I) ion solution and the exposure time of the plasmid-Ag(I) complex under UV light at 254 nm and room temperature. It is found that the plasmid serves not only as a template but also as a reductant to drive the silver nucleation and deposition. The resulting nanoparticles have a face-centered cubic (fcc) crystal structure and 20-30 nm average diameter. The detailed mechanism is discussed, and other metals or alloys could also be synthesized with this method.
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Affiliation(s)
- Jianhua Liu
- School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
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18
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Matsubayashi A, Fukunaga K, Tanaka K. Metal ions/ion clusters transport in glassy polymer films: construction of multi-layered polymer and metal composite films. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31923c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Jovanović Ž, Krklješ A, Stojkovska J, Tomić S, Obradović B, Mišković-Stanković V, Kačarević-Popović Z. Synthesis and characterization of silver/poly(N-vinyl-2-pyrrolidone) hydrogel nanocomposite obtained by in situ radiolytic method. Radiat Phys Chem Oxf Engl 1993 2011. [DOI: 10.1016/j.radphyschem.2011.06.005] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Matsubayashi A, Fukunaga K, Tsuji T, Ataka K, Ohsaki H. Multilayered ordering of the metal nanoparticles in polymer thin films under photoirradiation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:733-740. [PMID: 21166457 DOI: 10.1021/la102677h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Interference light-induced photogeneration of metal nanoparticle in polymer films was explored. The nanoparticle was obtained from metal complex homogeneously dispersed in the film. Standing waves resulting from light interference were generated by irradiating nearly monochromatic light to the sample placed on a reflective substrate. During irradiation metal nanoparticles were developed by photoreduction of the metal complexes forming layers rich with particles. These nanoparticle-enriched layers were found to align in parallel to the reflective substrate, and they were separated from each other by a constant spacing. This layer spacing was varied by changing the wavelength and/or the incident angle of the irradiating light. The observed results show that the spatial distribution of the nanoparticles is determined by the optical interference within the film. Surprisingly, regions exist between the nanoparticle-enriched layers where the metal species are not detected. Such regions extends for distances larger than tens of nanometers. This means that the metal complexes initially homogeneously dispersed within the polymer were transported away from certain regions upon photoirradiation. The metal precursors are preferentially photoreduced into the metal nanoparticles at the constructive interference regions. The spatially varying consumption rates of the precursors are considered to lead a concentration gradient, thereby causing a directional diffusion of the unreduced precursors toward the regions where constructive interference occurs.
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Affiliation(s)
- Akihiro Matsubayashi
- Organic Specialty Materials Research Laboratory, Ube Industries, Ltd., 8-1, Goi-minamikaigan, Ichihara, Chiba 290-0045, Japan
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Jacobs BW, Houk RJT, Anstey MR, House SD, Robertson IM, Talin AA, Allendorf MD. Ordered metal nanostructureself-assembly using metal–organic frameworks as templates. Chem Sci 2011. [DOI: 10.1039/c0sc00377h] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Synthesis, characterisation and antibacterial activity of PVA/TEOS/Ag-Np hybrid thin films. J Colloid Interface Sci 2010; 349:77-85. [DOI: 10.1016/j.jcis.2010.04.091] [Citation(s) in RCA: 98] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Revised: 04/29/2010] [Accepted: 04/30/2010] [Indexed: 11/23/2022]
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Brito-Silva AM, de Araújo CB, Brayner FA, Santos SS, Galembeck A, Milet ER. Silver nanoparticles formation within unsaturated polyester/styrene resins induced by UV irradiation and thermal treatment. POLYM ENG SCI 2010. [DOI: 10.1002/pen.21771] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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In-situ fabrication of polyacrylate–silver nanocomposite through photoinduced tandem reactions involving eosin dye. POLYMER 2010. [DOI: 10.1016/j.polymer.2009.05.003] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Nangmenyi G, Yue Z, Mehrabi S, Mintz E, Economy J. Synthesis and characterization of silver-nanoparticle-impregnated fiberglass and utility in water disinfection. NANOTECHNOLOGY 2009; 20:495705. [PMID: 19904023 DOI: 10.1088/0957-4484/20/49/495705] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A number of researchers have deployed silver (Ag) nanoparticles through a number of techniques on various substrates including carbon, zeolites and polymers for water disinfection applications. However, Ag impregnated on an inorganic fiberglass surface through a simple electroless process was only recently reported for the first time. Fiberglass impregnated with Ag nanoparticles displays superior performance over carbon-based silver support systems but little is known about the factors that affect the architecture of the system, its interfacial properties and its consequent bactericidal activity. In this study, Ag content and particle size on a fiberglass substrate were manipulated by adjusting the AgNO(3) concentration, immersion time, temperature, solution pH and reduction temperature. The reduction chemistry of the Ag-nanoparticle-impregnated fiberglass is described and supported with thermal gravimetric analysis (TGA) and photoelectron spectroscopy (XPS) measurements. The Ag content along with the particle size and particle size distribution were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive x-ray spectroscopy (EDS) and x-ray diffraction (XRD). The Ag content on the fiberglass mats ranged from 0.04 to 4.7 wt% Ag/g-fiber with a size distribution of 10-900 nm under standard processing conditions. Inductively coupled plasma mass spectrometry (ICP-MS) was used to analyze the Ag desorption from the fiberglass substrate, while the bactericidal properties were evaluated against Escherichia coli (E. coli).
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Affiliation(s)
- Gordon Nangmenyi
- Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, 1304 West Green Street, Urbana, IL 61801, USA.
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Sharma VK, Yngard RA, Lin Y. Silver nanoparticles: green synthesis and their antimicrobial activities. Adv Colloid Interface Sci 2009; 145:83-96. [PMID: 18945421 DOI: 10.1016/j.cis.2008.09.002] [Citation(s) in RCA: 1730] [Impact Index Per Article: 115.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2008] [Revised: 08/23/2008] [Accepted: 09/01/2008] [Indexed: 11/28/2022]
Abstract
This review presents an overview of silver nanoparticles (Ag NPs) preparation by green synthesis approaches that have advantages over conventional methods involving chemical agents associated with environmental toxicity. Green synthetic methods include mixed-valence polyoxometallates, polysaccharide, Tollens, irradiation, and biological. The mixed-valence polyoxometallates method was carried out in water, an environmentally-friendly solvent. Solutions of AgNO(3) containing glucose and starch in water gave starch-protected Ag NPs, which could be integrated into medical applications. Tollens process involves the reduction of Ag(NH(3))(2)(+) by saccharides forming Ag NP films with particle sizes from 50-200 nm, Ag hydrosols with particles in the order of 20-50 nm, and Ag colloid particles of different shapes. The reduction of Ag(NH(3))(2)(+) by HTAB (n-hexadecyltrimethylammonium bromide) gave Ag NPs of different morphologies: cubes, triangles, wires, and aligned wires. Ag NPs synthesis by irradiation of Ag(+) ions does not involve a reducing agent and is an appealing procedure. Eco-friendly bio-organisms in plant extracts contain proteins, which act as both reducing and capping agents forming stable and shape-controlled Ag NPs. The synthetic procedures of polymer-Ag and TiO(2)-Ag NPs are also given. Both Ag NPs and Ag NPs modified by surfactants or polymers showed high antimicrobial activity against gram-positive and gram-negative bacteria. The mechanism of the Ag NP bactericidal activity is discussed in terms of Ag NP interaction with the cell membranes of bacteria. Silver-containing filters are shown to have antibacterial properties in water and air purification. Finally, human and environmental implications of Ag NPs to the ecology of aquatic environment are briefly discussed.
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Affiliation(s)
- Virender K Sharma
- Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, Melbourne, Florida 32901, USA.
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Anyaogu KC, Cai X, Neckers DC. Gold Nanoparticle Photopolymerization of Acrylates. Macromolecules 2008. [DOI: 10.1021/ma801391p] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Kelechi C. Anyaogu
- Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403
| | - Xichen Cai
- Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403
| | - Douglas C. Neckers
- Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403
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Bernabò M, Ciardelli F, Pucci A, Ruggeri G. Preparation and Optical Properties of New Metal/Macromolecule Architectures. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/masy.200851021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Krklješ AN, Marinović-Cincović MT, Kacarevic-Popovic ZM, Nedeljković JM. Radiolytic synthesis and characterization of Ag-PVA nanocomposites. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.03.023] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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30
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Nanohybrid polymer prepared by successive polymerization of methacrylate monomer containing silver nanoparticles in situ prepared under microwave irradiation. POLYMER 2007. [DOI: 10.1016/j.polymer.2007.01.047] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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31
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Nadagouda MN, Varma RS. Preparation of Novel Metallic and Bimetallic Cross-Linked Poly(vinyl alcohol) Nanocomposites under Microwave Irradiation. Macromol Rapid Commun 2007. [DOI: 10.1002/marc.200600735] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Thermal properties of radiolytically synthesized PVA/Ag nanocomposites. HEMIJSKA INDUSTRIJA 2007. [DOI: 10.2298/hemind0703129k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The radiolytic method was used to synthesize two types of nanocomposites with silver, PVA/Ag by film casting and PVA hydrogel/Ag nanocomposites. This method is particularly suitable for generating metal nanoparticles in solution. The radiolytic species (solvated electrons and secondary radicals) exhibit strong reducing properties such that metal ions are reduced at each encounter. Metal atoms then tend to grow into larger clusters. It was found that solid or swollen polymers are able to stabilize small crystallites against spontaneous growth via aggregation. Using differential scanning calorimetry (DSC), the melting behavior and kinetics of the PVA/Ag nanocomposites were investigated and compared to those of pure PVA. The melting as well as crystallization behavior of polymers is crucial because it governs the thermal properties, impact resistance and stress strain properties. Understanding the melting behavior is significant not only to tailor the properties of nanocomposites but to investigate the interactions between the constituents. The DSC curves of pure PVA and prepared nanocomposites show only one melting peak between 175 and 230?C, indicating that the melting behavior of these two systems are analogous. In both cases, with increasing heating rate, the melting peak shifts to a higher temperature, but with increasing Ag content the peak melting temperature is lower. When specimens are heated at high heating rate, the motion of PVA molecular chains cannot follow the heating temperature on time due to the influence of heat hysteresis, which leads to a higher peak melting temperature. When Ag nanoparticles are added they increase the heat transfer among the PVA molecular chains decreasing the melting temperature. The Ag content is a major factor affecting the degree of crystallinity. It was observed that at low nanofiller content, up to the 0.5 wt%, the degree of crystallinity of the nanocomposites increased, while at a higher content the crystallization was retarded. The half time of melting is non-linearly dependent on the amount of nanofiller. In the range from 0.25 to 1 wt% Ag it slightly increases, because at a low Ag content the nanoparticles act as a heterogeneous nucleation agent during the crystallization process. For large amounts of nanofiller, the half time of melting is markedly higher than for pure PVA. At a higher Ag content, the nanoparticles act as a barrier that restricts the thermal motion of PVA molecular chains and the half time of complete melting increases. The significantly lower melting activation energy of the nanocomposites with high amount of nanofiller compared to pure PVA, calculated by the Kissinger method, indicated that nanoparticles reduced the heat barrier for the melting process. .
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Krklješ A, Nedeljković J, Kačarević-Popović Z. Fabrication of Ag-PVA hydrogel nanocomposite by γ-irradiation. Polym Bull (Berl) 2006. [DOI: 10.1007/s00289-006-0593-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Korchev AS, Konovalova T, Cammarata V, Kispert L, Slaten L, Mills G. Radical-induced generation of small silver particles in SPEEK/PVA polymer films and solutions: UV-Vis, EPR, and FT-IR studies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:375-84. [PMID: 16378448 DOI: 10.1021/la0512345] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The present study is centered on the processes involved in the photochemical generation of nanometer-sized Ag particles via illumination at 350 nm of aqueous solutions and cross linked films containing sulfonated poly(ether ether ketone) and poly(vinyl alcohol). Optical and electron paramagnetic resonance experiments, including electron nuclear double resonance data, proved conclusively that the photogenerated chromophore exhibiting a band with lambda(max) = 565 nm is an alpha-hydroxy aromatic (ketyl) radical of the polymeric ketone. This reducing species was produced by illumination of either solutions or films, but the radical lifetime extended from minutes in the fluid phase to hours in the solid. Direct evidence is presented that this long-lived chromophore reduces Ag(I), Cu(II), and Au(III) ions in solution. A rate constant of k = 1.4 x 10(3) M(-)(1) s(-)(1) was obtained for the reduction of Ag(+) by the ketyl radical from the post-irradiation formation of Ag crystallites. FTIR results confirmed that the photoprocess yielding polymeric ketyl radicals involves a reaction between the macromolecules. The photochemical oxidation of the polymeric alcohol, as well as the formation of light-absorbing macromolecular products and polyols, indicates that the sulfonated polyketone experienced transformations similar to those encountered during illumination of the benzophenone/2-propanol system.
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Affiliation(s)
- A S Korchev
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA
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Yu H, Xu X, Chen X, Lu T, Zhang P, Jing X. Preparation and antibacterial effects of PVA-PVP hydrogels containing silver nanoparticles. J Appl Polym Sci 2006. [DOI: 10.1002/app.24835] [Citation(s) in RCA: 173] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Korchev AS, Shulyak TS, Slaten BL, Gale WF, Mills G. Sulfonated Poly(Ether Ether Ketone)/Poly(Vinyl Alcohol) Sensitizing System for Solution Photogeneration of Small Ag, Au, and Cu Crystallites. J Phys Chem B 2005; 109:7733-45. [PMID: 16851898 DOI: 10.1021/jp045047b] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Illumination of air-free aqueous solutions containing sulfonated poly(ether ether ketone) and poly(vinyl alcohol) with 350 nm light results in benzophenone ketyl radicals of the polyketone. The polymer radicals form with a quantum yield 0.02 and decay with a second-order rate constant 6 orders of magnitude lower than that of typical alpha-hydroxy radicals. Evidence is presented that the polymeric benzophenone ketyl radicals reduce Ag+, Cu2+, and AuCl4- to metal particles of nanometer dimensions. Decreases in the reduction rates with increasing Ag(I), Cu(II), and Au(III) concentrations are explained using a kinetic model in which the metal ions quench the excited state of the polymeric benzophenone groups, which forms the macromolecular radicals. Quenching is fastest for Ag+, whereas Cu2+ and AuCl4- exhibit similar rate constants. Particle formation becomes more complex as the number of equivalents needed to reduce the metal ions increases; the Au(III) system is an extreme case where the radical reactions operate in parallel with secondary light-initiated and thermal reduction channels. For each metal ion, the polymer-initiated photoreactions produce crystallites possessing distinct properties, such as a very strong plasmon in the Ag case or the narrow size distribution exhibited by Au particles.
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Affiliation(s)
- A S Korchev
- Department of Chemistry, Auburn University, Alabama 36849, USA
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Gaddy GA, McLain JL, Korchev AS, Slaten BL, Mills G. Kinetics of Silver Particle Photogeneration in Crosslinked PVA/PAA Films. J Phys Chem B 2004. [DOI: 10.1021/jp0497559] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- G. A. Gaddy
- Department of Chemistry and Department of Consumer Affairs, Auburn University, Auburn, Alabama 36849
| | - J. L. McLain
- Department of Chemistry and Department of Consumer Affairs, Auburn University, Auburn, Alabama 36849
| | - A. S. Korchev
- Department of Chemistry and Department of Consumer Affairs, Auburn University, Auburn, Alabama 36849
| | - B. L. Slaten
- Department of Chemistry and Department of Consumer Affairs, Auburn University, Auburn, Alabama 36849
| | - G. Mills
- Department of Chemistry and Department of Consumer Affairs, Auburn University, Auburn, Alabama 36849
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