Preparation of Silver Nanoparticles in Cellulose Acetate Polymer and the Reaction Chemistry of Silver Complexes in the Polymer

Kwon, Jiwoon; Yoon, Seok Hwan; Lee, Seung Soo; Seo, Kook Won; Shim, Il-Wun

doi:10.5012/bkcs.2005.26.5.837

Cited by 43 publications

(8 citation statements)

References 17 publications

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“…In doing so, we find the maximum temperature rise at the respective power density thresholds to be within 10% of each other on all three substrates; this temperature rise being ∼197 K. Note, we reference the maximum temperature rise because it is indicative of the power density at the center of the Gaussian spatial profile associated with our laser beam. This is in reasonable agreement with previous works, where the value for thermal reduction of AgNO 3 has been measured to be as low as 150 • C (equivalent to a ∼130 K temperature rise), allowing for at least partial thermal reduction of AgNO 3 [45].…”

supporting

confidence: 93%

“…Conversely, glass reaches high enough temperatures for rapid decomposition of AgNO 3 and subsequent nucleation of metallic silver. Crystalline quartz, with an order of magnitude larger thermal conductivity as compared to the SiO 2 glass (and thus lower steady-state temperature rise at the solid-liquid interface), only undergoes partial decomposition of silver nitrate, leading to minimal nucleation [45]. Although photo-decomposition may be operating in tandem with thermal reduction of the precursor, the agreement between varying wavelengths in both a pulsed and continuous-wave laser implies the role of thermal accumulation can not be ignored.…”

mentioning

confidence: 99%

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Substrate thermal conductivity controls the ability to manufacture microstructures via laser-induced direct write

Tomko

Olson

Braun

et al. 2018

Applied Physics Letters

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In controlling the thermal properties of the surrounding environment, we provide insight to underlying mechanisms driving the widely-used laser direct write method for additive manufacturing. We find that the onset of silver nitrate reduction for the formation of direct write structures directly corresponds to the calculated steady-state temperature rises associated with high-repetition, ultrafast laser pulses. Furthermore, varying the geometry of the heat affected zone, which is controllable based on in-plane thermal diffusion, driven by the substrate thermal conductivity, and laser power, allows for control of the written geometries without any prior substrate preparation. These findings allow for the advance of rapid manufacturing of micro-and nanoscale structures with minimal material constraints through consideration of the laser-controllable thermal transport in ionic liquid/substrate media.

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confidence: 93%

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confidence: 99%

Substrate thermal conductivity controls the ability to manufacture microstructures via laser-induced direct write

Tomko

Olson

Braun

et al. 2018

Applied Physics Letters

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“…Thus, the Ag + ions migrate to the fiber surface during the calcination process because of elimination of the organic compounds and further crystallization of the anatase crystals. As the ions are subsequently reduced to Ag via thermal decomposition of AgNO 3 (eq 2), 23 the newly formed dopant particles form nonuniform grain boundaries on the TiO 2 surface, thus retarding crystal growth of the anatase crystallites. 9,24 This mechanism of Ag formation also explains the observance of bumps on the nanofiber surface in AgT1 and AgT2 samples in Figure 1.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Enhancing the Antibacterial Performance of Titanium Dioxide Nanofibers by Coating with Silver Nanoparticles

Soo

Chai

Ang

et al. 2020

ACS Appl. Nano Mater.

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The potential of titanium dioxide (TiO2) nanofibers in antibacterial applications has received wide attention. This interest is further enhanced by the possible incorporation of silver (Ag) to form a double-antibacterial composite agent. In this study, Ag-doped TiO2 (AgTiO2) nanofibers were synthesized with various Ag concentrations using electrospinning and calcination. The obtained fibers were then assessed for its antibacterial performance against a gamut of common Gram-positive and Gram-negative bacteria cells. The results showed a deterioration in the fiber surface area and pore volume at increasing Ag concentration, which is attributed to pore blocking by the Ag nanoparticles. The fiber diameter is also affected by the addition of Ag, with a minimum fiber diameter of 88.9 ± 22.8 nm achieved at 1% Ag loading. The change in the TiO2 fiber crystallinity is relatively minor, with highly crystalline anatase observed for all samples with small differences in the anatase crystallite sizes. In antibacterial tests, AgTiO2 nanofibers are found to have a performance superior to that of intrinsic TiO2 nanofibers because of the synergistic combination of Ag and photocatalytic TiO2. Maximum log reductions of 5.92 ± 0 and 1.38 ± 0.07 colony-forming units for Salmonella Albany and Staphylococcus aureus bacteria samples, respectively, are reported for AgTiO2 nanofibers with 2% Ag loading.

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“…In the present study, Pebax 2533 was loaded with 36% AgBF 4 to improve its CO 2 selectivity. Silver is superior to other metals in electrical property, antimicrobial effect, optical properties, and oxidation catalysis . Silver salts such as AgBF 4 readily dissolve in commercially available polar polymers such as Pebax, which has the ability to solvate silver salts into active Ag + for complexation with the polymer matrix .…”

Section: Introductionmentioning

confidence: 99%

Permeation of Carbon Dioxide and Methane Gases through Novel Silver-Incorporated Thin Film Composite Pebax Membranes

Sridhar

Aminabhavi

Mayor

et al. 2007

Ind. Eng. Chem. Res.

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The selectivity of a membrane for CO 2 /CH 4 separation is critical for purification of natural gas, landfill gas, and biogas since CO 2 is the major impurity present in gas mixtures while CH 4 is the major hydrocarbon constituent. The performance of poly(ether-block-amide) (Pebax 2533) membrane and its silver-incorporated form were investigated with respect to their permeation properties for these two gases. Thin-film composite (TFC) membranes of Pebax were prepared by dissolving 20 g of the polymer in 80 mL of 3:7 volumetric ratio of m-cresol/isopropanol solvent mixture, followed by casting on polyvinylidene fluoride (PVDF) ultrafiltration substrate. Silver incorporation was carried out by loading silver tetrafluoroborate (AgBF 4 ) at 36% of the Pebax polymer weight in the same dope solution. Membranes were characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), and scanning electron microscopy (SEM) to study intermolecular interactions, crystalline nature, and surface and cross-sectional morphologies, respectively. At a feed pressure of 1 MPa, Pebax gave a CO 2 permeance of 32.8 GPU at a CO 2 /CH 4 selectivity of 15.3, whereas Ag-Pebax exhibited an enhanced selectivity of 36.2, even though its permeance was reduced to 12.1 GPU. The Ag-Pebax membrane was further upscaled as a spiral-wound module of 0.20 m 2 effective area to test its commercial feasibility.

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Preparation of Silver Nanoparticles in Cellulose Acetate Polymer and the Reaction Chemistry of Silver Complexes in the Polymer

Cited by 43 publications

References 17 publications

Substrate thermal conductivity controls the ability to manufacture microstructures via laser-induced direct write

Substrate thermal conductivity controls the ability to manufacture microstructures via laser-induced direct write

Enhancing the Antibacterial Performance of Titanium Dioxide Nanofibers by Coating with Silver Nanoparticles

Permeation of Carbon Dioxide and Methane Gases through Novel Silver-Incorporated Thin Film Composite Pebax Membranes

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