FTIR-ATR studies of the sorption and diffusion of acetone:water mixtures in poly(vinyl alcohol)-clay nanocomposites

Polymer ◽  
2012 ◽  
Vol 53 (20) ◽  
pp. 4420-4428 ◽  
Author(s):  
Alastair F. Breen ◽  
Chris Breen ◽  
Francis Clegg ◽  
Leena-Marie Döppers ◽  
Khairuddin ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Clay Nanocomposites ◽  
And Diffusion

Ciprofloxacin-loaded alginate/poly (vinyl alcohol)/gelatin electrospun nanofiber mats as antibacterial wound dressings

2021 ◽  
pp. 152808372199746
Author(s):  
Tittaya Thairin ◽  
Patcharaporn Wutticharoenmongkol
Keyword(s):  
Weight Loss ◽  
Vinyl Alcohol ◽  
Diffusion Method ◽  
Poly Vinyl Alcohol ◽  
Burst Release ◽  
Electrospun Nanofiber ◽  
Total Immersion ◽  
Water Swelling ◽  
Nanofiber Mats ◽  
And Diffusion

Herein, ciprofloxacin (CIP)-loaded alginate/poly (vinyl alcohol)/gelatin (SPG) (CIP–SPG) nanofiber mats were successfully fabricated by electrospinning. The average fiber diameters of the mats before and after crosslinking were in the range of 190–260 and 385–484 nm, respectively. The chemical integrity of CIP remained intact after encapsulation into the mats. The degree of weight loss and water swelling decreased with an increase in the gelatin content of the electrospun nanofiber mats. A release study was carried out by total immersion and diffusion methods using phosphate buffer as a release medium. Burst release of CIP was observed in case of the total immersion method, while a more sustained release was observed in case of the diffusion method. The maximum amounts of CIP released during total immersion and diffusion were in the range of 70–90% and 72–85%, respectively. For both the total immersion and diffusion methods, the released amounts of CIP decreased and the release slowed down with an increase in the gelatin content; this result is consistent with the weight loss and water swelling values. The Young’s modulus increased, while the tensile strength and strain at break decreased with an increase in the gelatin content. The CIP–SPG nanofiber mats were slightly toxic to L929 mouse fibroblasts as evaluated by indirect cytotoxicity assay. The electrospun CIP–SPG nanofiber mats exhibited excellent antimicrobial activity against Staphylococcus aureus and Escherichia coli. These results reveal that the electrospun CIP–SPG nanofiber mats are potentially promising materials for wound healing applications.

A Study of the Microstructural and Diffusion Properties of Poly(vinyl alcohol) Cryogels Containing Surfactant Supramolecular Aggregates

2006 ◽  
Vol 110 (46) ◽  
pp. 23031-23040 ◽  
Author(s):  
Annamaria Tedeschi ◽  
Finizia Auriemma ◽  
Rosa Ricciardi ◽  
Gaetano Mangiapia ◽  
Marco Trifuoggi ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Supramolecular Aggregates ◽  
And Diffusion ◽  
Diffusion Properties

scholarly journals Pervaporation Performance of Ag-PVA Nanocomposite Membranes: Effect of Operating Temperature

2019 ◽  
Vol 64 (1) ◽  
pp. 85-92 ◽  
Author(s):  
Asmaa Selim ◽  
András József Tóth ◽  
Enikő Haáz ◽  
Dániel Fózer ◽  
Péter Mizsey
Keyword(s):  
Vinyl Alcohol ◽  
Water Flux ◽  
Sorption Process ◽  
Poly Vinyl Alcohol ◽  
Nanocomposite Membranes ◽  
Azeotropic Point ◽  
Influence Of Temperature On ◽  
And Diffusion

The features of pervaporation are continuously improved with the production of more and more efficient membranes. In our present study, silver nanoparticles are in-situ generated in a poly (vinyl alcohol) using solution-casting in order to enhance its capability for pervaporation. The membrane is tested on the case study of ethanol dehydration by pervaporation. Effect of silver content on the pervaporation separation index and the enrichment factor of the membrane at 15 % mass water at 40 °C are reported. Pervaporation data for nanocomposite membranes show around 100 % increase in the water permeance values while the intrinsic selectivity decreases that is typical for pervaporation membranes. The water permeances of original crosslinked PVA membrane and the 2.5 % silver loaded PVA membrane are 26.65 and 70.45 (g/m2.kPa.h), respectively. The values of total flux are closely related to water flux, showing that membranes could be successfully assigned to separate water from ethanol even at the azeotropic point. The influence of temperature on the efficiency of the pervaporation process, permeation parameter and diffusion coefficient of the feed component is also discussed. The negative heat of sorption (∆Hs) values calculated on the basis of the estimated Arrhenius activation energy values indicates that the sorption process is controlled by Langmuir's mode. Our results show that the 0.5 mass% silver loaded poly (vinyl alcohol) membrane exhibits excellent PV performance.

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