Kinetics of Silver Particle Photogeneration in Crosslinked PVA/PAA Films

Gaddy, G. A.; McLain, J. L.; Korchev, A. S.; Slaten, B. L.; Mills, G.

doi:10.1021/jp0497559

Cited by 23 publications

(20 citation statements)

References 39 publications

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“…In our case, the nanoparticles are developed by the photolysis of the metal precursor. It is known that the rate constant of the photoreduction of metal precursors significantly depends on the light intensity. , The Ag precursors distributed uniformly in the sample before irradiation (Figure a) are preferentially reduced to Ag nanoparticles at the regions in which the constructive interference occurs. In the destructive interference regions, reduction of the Ag precursor is considerably deficient.…”

Section: Discussionmentioning

confidence: 99%

Multilayered Ordering of the Metal Nanoparticles in Polymer Thin Films under Photoirradiation

et al. 2010

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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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Section: Discussionmentioning

confidence: 99%

Multilayered Ordering of the Metal Nanoparticles in Polymer Thin Films under Photoirradiation

et al. 2010

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“…Glutaraldehyde is the most commonly used cross-linker for PVA via aldol condensation. However, glutaraldehyde is toxic, expensive, difficult to synthesize, and environmentally unfriendly . What is more, the particular preparation process, especially the postprocessing, is a tough task to conquer because of the nondegradable nature. ,, …”

Section: Introductionmentioning

confidence: 99%

“…However, glutaraldehyde is toxic, expensive, difficult to synthesize, and environmentally unfriendly. 32 What is more, the particular preparation process, especially the postprocessing, is a tough task to conquer because of the nondegradable nature. 16,33,34 Herein, we present a simple strategy to prepare treatable and porous three-dimensional (3D) material through cross-linking PVA by using Na 2 SiO 3 as a cross-linker, which is easy in fabrication, low-cost, and environmentally friendly.…”

Section: ■ Introductionmentioning

confidence: 99%

Decomposable Polyvinyl Alcohol-Based Super-Hydrophobic Three-Dimensional Porous Material for Effective Water/Oil Separation

Wang

Akram

et al. 2018

Langmuir

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The development of the oil industry brings the critical problem of ocean pollution by oil spill or fossil fuels. The use of materials for water/oil separation is one of the effective approaches to solve this crisis. Polyvinyl alcohol (PVA) has been used to prepare water/oil separation materials. Currently, glutaraldehyde has been employed as the cross-linking agent, which is well known to be toxic and environmentally unfriendly. Moreover, it is difficult to deal with the disposal of the Across-linked material. Here, we propose a strategy of fabricating macroporous material which was prepared by PVA and sodium silicate (Na 2 SiO 3 ) in aqueous solution. Following through with the one-step method of sol−gel reaction of hydroxyl groups with trimethoxy(octadecyl)silane, the low surface energy substance was grafted on the macroporous material and a superhydrophobic macroporous membrane for water/oil separation was prepared. As oil sorbent, the as-prepared dried superhydrophobic PVA/Na 2 SiO 3 porous materials (PSD6S) have the adsorption capacity of 1.8−7.0 g/g for oil uptake, which depends on the type of oil liquid. Typically, the separation efficiency of this material could reach more than 99% even after 10 times of use without the help of ambient pressure. It is noteworthy that the as-prepared samples could be easily decomposable and dissolvable completely in acidic medium at a rapid rate.

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“…In the last decade, a lot of effort was focused on the preparation of silver “nanodispersion”directly in the PVA matrix by a one‐step method based on the reduction of the inorganic precursor through a solid state synthesis. Thermal annealing22–24 and UV irradiation19, 25, 26 are the bases for very efficient methodologies because they take advantage of the formation of a complex between the PVA matrix and the silver nitrate. Ag + ions can be easily chelated by the hydroxyl groups of the polymer27 and then reduced directly in the host matrix.…”

Section: Introductionmentioning

confidence: 99%

Thermal‐ and Sun‐Promoted Generation of Silver Nanoparticles Embedded into Poly(vinyl alcohol) Films

Bernabò

Pucci

Galembeck

et al. 2009

Macro Materials & Eng

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Nanocomposites based on poly(vinyl alcohol) and silver nanoparticles were efficiently prepared by sun- and thermal-promoted reduction processes. Uniaxial drawing of the Ag/PVA nanocomposites favoured the anisotropic distribution of silver particles, providing oriented films with polarisation-dependent tunable optical properties. These dichroic properties were more pronounced for nanocomposites produced by sun exposition, which provided more compact and interacting metal clusters. The results obtained suggest the nanocomposite films could find potential applications as colour polarising filters, radiation responsive polymeric objects and smart flexible films in packaging application

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Kinetics of Silver Particle Photogeneration in Crosslinked PVA/PAA Films

Cited by 23 publications

References 39 publications

Multilayered Ordering of the Metal Nanoparticles in Polymer Thin Films under Photoirradiation

Multilayered Ordering of the Metal Nanoparticles in Polymer Thin Films under Photoirradiation

Decomposable Polyvinyl Alcohol-Based Super-Hydrophobic Three-Dimensional Porous Material for Effective Water/Oil Separation

Thermal‐ and Sun‐Promoted Generation of Silver Nanoparticles Embedded into Poly(vinyl alcohol) Films

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