Reaction mechanism of thermally-induced electric conduction of poly(vinyl alcohol)–silver nitrate hybrid films

RSC Advances ◽  
2016 ◽  
Vol 6 (61) ◽  
pp. 56728-56737 ◽  
Author(s):  
Yong Gan ◽  
Shibing Bai ◽  
Shouliang Hu ◽  
Xiang Zhao ◽  
Yuefang Li
Keyword(s):  
Reaction Mechanism ◽  
Silver Nitrate ◽  
Metal Nanoparticles ◽  
Vinyl Alcohol ◽  
Hybrid Composites ◽  
Functional Materials ◽  
Poly Vinyl Alcohol ◽  
Electric Conduction ◽  
Hybrid Films ◽  
Thermally Induced

The combination of metal nanoparticles and polymers endows their hybrid composites with a number of unique features and opens a new way to fabricate novel functional materials.

scholarly journals The Design, Characterization and Antibacterial Activity of Heat and Silver Crosslinked Poly(Vinyl Alcohol) Hydrogel Forming Dressings Containing Silver Nanoparticles

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 96
Author(s):  
John Jackson ◽  
Helen Burt ◽  
Dirk Lange ◽  
In Whang ◽  
Robin Evans ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Silver Nitrate ◽  
Vinyl Alcohol ◽  
Unmet Need ◽  
Chemical Characterization ◽  
Wound Dressings ◽  
Poly Vinyl Alcohol ◽  
Burn Wound

The prompt treatment of burn wounds is essential but can be challenging in remote parts of Africa, where burns from open fires are a constant hazard for children and suitable medical care may be far away. Consequently, there is an unmet need for an economical burn wound dressing with a sustained antimicrobial activity that might be manufactured locally at low cost. This study describes and characterizes the novel preparation of a silver nitrate-loaded/poly(vinyl alcohol) (PVA) film. Using controlled heating cycles, films may be crosslinked with in situ silver nanoparticle production using only a low heat oven and little technical expertise. Our research demonstrated that heat-curing of PVA/silver nitrate films converted the silver to nanoparticles. These films swelled in water to form a robust, wound-compatible hydrogel which exhibited controlled release of the antibacterial silver nanoparticles. An optimal formulation was obtained using 5% (w/w) silver nitrate in PVA membrane films that had been heated at 140 °C for 90 min. Physical and chemical characterization of such films was complemented by in vitro studies that confirmed the effective antibacterial activity of the released silver nanoparticles against both gram positive and negative bacteria. Overall, these findings provide economical and simple methods to manufacture stable, hydrogel forming wound dressings that release antibiotic silver over prolonged periods suitable for emergency use in remote locations.

Fully biodegradable hybrid poly(vinyl alcohol)-based composites reinforced with flax/cotton fabric and modified with a waste filler: Thermomechanical properties

2020 ◽  
pp. 096739112091845
Author(s):  
Olga Mysiukiewicz ◽  
Mateusz Barczewski ◽  
Danuta Matykiewicz ◽  
Katarzyna Skórczewska
Keyword(s):  
Circular Economy ◽  
Vinyl Alcohol ◽  
Hybrid Composites ◽  
Thermomechanical Properties ◽  
Woven Fabric ◽  
Poly Vinyl Alcohol ◽  
Thermomechanical Characteristics ◽  
Chestnut Shell ◽  
Static Tensile ◽  
Shell Powder

The object of the research was biodegradable hybrid composites based on poly(vinyl alcohol) (PVA), reinforced with cotton/flax woven fabric and 5–30 phr of chestnut shell powder, a waste filler. The influence of the lignocellulosic particles on mechanical, thermal, and thermomechanical properties of the composites determined in static tensile test, thermogravimetric analysis, and dynamic mechanical thermal analysis and evaluated in reference to the materials’ structures assessed by means of optical microscopy. The analysis was complemented with evaluation of physical properties of the composites, such as density and moisture content. It was found that the hybrid composites present favorable properties and addition of the waste filler does not cause a deterioration of the thermomechanical characteristics of the materials. Utilization of the waste filler for production of the PVA-based composites is consistent with the idea of Circular Economy and also allows to obtain materials with properties comparable with the ones of conventional polymers.

Antibacterial electrospun chitosan/poly(vinyl alcohol) nanofibers containing silver nitrate and titanium dioxide

2009 ◽  
Vol 111 (6) ◽  
pp. 2892-2899 ◽  
Author(s):  
Bokgi Son ◽  
Bong-Yeol Yeom ◽  
Sang Hun Song ◽  
Chang-Soo Lee ◽  
Taek Sung Hwang
Keyword(s):  
Titanium Dioxide ◽  
Silver Nitrate ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol
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