Microdynamics Mechanism of Thermal-Induced Hydrogel Network Destruction of Poly(vinyl alcohol) in D2O Studied by Two-Dimensional Infrared Correlation Spectroscopy

2014 ◽  
Vol 118 (31) ◽  
pp. 9496-9506 ◽  
Author(s):  
Leilei Peng ◽  
Tao Zhou ◽  
Yun Huang ◽  
Long Jiang ◽  
Yi Dan
Keyword(s):  
Vinyl Alcohol ◽  
Correlation Spectroscopy ◽  
Poly Vinyl Alcohol ◽  
Two Dimensional ◽  
Hydrogel Network

scholarly journals Molecular diffusion in ternary poly(vinyl alcohol) solutions

2021 ◽  
Author(s):  
Katarzyna Majerczak ◽  
Ophelie Squillace ◽  
Zhiwei Shi ◽  
Zhanping Zhang ◽  
Zhenyu J. Zhang
Keyword(s):  
Rhodamine B ◽  
Vinyl Alcohol ◽  
Molecular Diffusion ◽  
Chemical Species ◽  
Correlation Spectroscopy ◽  
Molecular Probe ◽  
Poly Vinyl Alcohol ◽  
Industrial Complex ◽  
Crowding Effect ◽  
Diffusion Characteristics

AbstractThe diffusion kinetics of a molecular probe—rhodamine B—in ternary aqueous solutions containing poly(vinyl alcohol), glycerol, and surfactants was investigated using fluorescence correlation spectroscopy and dynamic light scattering. We show that the diffusion characteristics of rhodamine B in such complex systems is determined by a synergistic effect of molecular crowding and intermolecular interactions between chemical species. The presence of glycerol has no noticeable impact on rhodamine B diffusion at low concentration, but significantly slows down the diffusion of rhodamine B above 3.9% (w/v) due to a dominating steric inhibition effect. Furthermore, introducing surfactants (cationic/nonionic/anionic) to the system results in a decreased diffusion coefficient of the molecular probe. In solutions containing nonionic surfactant, this can be explained by an increased crowding effect. For ternary poly(vinyl alcohol) solutions containing cationic or anionic surfactant, surfactant—polymer and surfactant—rhodamine B interactions alongside the crowding effect of the molecules slow down the overall diffusivity of rhodamine B. The results advance our insight of molecular migration in a broad range of industrial complex formulations that incorporate multiple compounds, and highlight the importance of selecting the appropriate additives and surfactants in formulated products.

Nanoprobe Diffusion in Poly(Vinyl-alcohol) Gels and Solutions: Effects of pH and Dehydration

2014 ◽  
Vol 1622 ◽  
pp. 135-145
Author(s):  
Hacène Boukari ◽  
Candida Silva ◽  
Ralph Nossal ◽  
Ferenc Horkay
Keyword(s):  
Diffusion Coefficient ◽  
Vinyl Alcohol ◽  
Correlation Spectroscopy ◽  
Poly Vinyl Alcohol ◽  
Linear Polymers ◽  
Fluorescence Correlation ◽  
Slowing Down ◽  
Effects Of Ph ◽  
Physical Interactions ◽  
Pva Solutions

ABSTRACTWe report fluorescence correlation spectroscopy (FCS) measurements of the translational diffusion of two fluorescent nanoprobes, rhodamine (R6G) and carboxytetramethylrhodamine (TAMRA), embedded in poly(vinyl alcohol) (PVA) solutions and gels. The diffusion coefficient was measured as a function of the PVA concentration and pH. Furthermore, we designed and built an optical chamber to determine the diffusion coefficient of the nanoprobes within the PVA solutions and gels subjected to controlled dehydration. We find that 1) lowering pH causes an apparent slowing down of the diffusion of the nanoprobes, 2) increase of PVA concentration and crosslink density also induce slowing down of both nanoprobes, and 3) dehydration induces systematic decrease of the diffusion of TAMRA in both solutions and gels. Taken together, these results demonstrate that transient physical interactions between the nanoprobes and the PVA linear polymers have a significant effect upon nanoprobe diffusion.

Probe Diffusion in Aqueous Poly(vinyl alcohol) Solutions Studied by Fluorescence Correlation Spectroscopy

2007 ◽  
Vol 8 (5) ◽  
pp. 1595-1600 ◽  
Author(s):  
Ariel Michelman-Ribeiro ◽  
Ferenc Horkay ◽  
Ralph Nossal ◽  
Hacène Boukari
Keyword(s):  
Fluorescence Correlation Spectroscopy ◽  
Vinyl Alcohol ◽  
Correlation Spectroscopy ◽  
Poly Vinyl Alcohol ◽  
Fluorescence Correlation

Influence of citric acid on the physical and biomineralization ability of freeze/thaw poly(vinyl alcohol) hydrogel

2018 ◽  
Vol 33 (1) ◽  
pp. 94-102 ◽  
Author(s):  
Mohamad Nizam Abdul Wahid ◽  
Saiful Izwan Abd Razak ◽  
Mohammed Rafiq Abdul Kadir ◽  
Rozita Hassan ◽  
Nadirul Hasraf Mat Nayan ◽  
...  
Keyword(s):  
Citric Acid ◽  
Simulated Body Fluid ◽  
Vinyl Alcohol ◽  
Body Fluid ◽  
Load Resistance ◽  
Poly Vinyl Alcohol ◽  
Porous Hydroxyapatite ◽  
Freeze Thaw ◽  
Hydrogel Network ◽  
Hydroxyapatite Formation

This work reports the modification of freeze/thaw poly(vinyl alcohol) hydrogel using citric acid as the bioactive molecule for hydroxyapatite formation in simulated body fluid. Inclusion of 1.3 mM citric acid into the poly(vinyl alcohol) hydrogel showed that the mechanical strength, crystalline phase, functional groups and swelling ability were still intact. Adding citric acid at higher concentrations (1.8 and 2.3 mM), however, resulted in physically poor hydrogels. Presence of 1.3 mM of citric acid showed the growth of porous hydroxyapatite crystals on the poly(vinyl alcohol) surface just after one day of immersion in simulated body fluid. Meanwhile, a fully covered apatite layer on the poly(vinyl alcohol) surface plus the evidence of apatite forming within the hydrogel were observed after soaking for seven days. Gel strength of the soaked poly(vinyl alcohol)/citric acid-1.3 mM hydrogel revealed that the load resistance was enhanced compared to that of the neat poly(vinyl alcohol) hydrogel. This facile method of inducing rapid growth of hydroxyapatite on the hydrogel surface as well as within the hydrogel network can be useful for guided bone regenerative materials.

scholarly journals Preliminary Characterization of Genipin-Cross-Linked Silk Sericin/Poly(vinyl alcohol) Films as Two-Dimensional Wound Dressings for the Healing of Superficial Wounds

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Tippawan Siritientong ◽  
Juthamas Ratanavaraporn ◽  
Teerapol Srichana ◽  
Pornanong Aramwit
Keyword(s):  
Vinyl Alcohol ◽  
Light Transmission ◽  
Transmission Rate ◽  
Wound Dressings ◽  
Poly Vinyl Alcohol ◽  
Cross Linking ◽  
Two Dimensional ◽  
Silk Sericin ◽  
Superficial Skin

The genipin-cross-linked silk sericin/poly(vinyl alcohol) (PVA) films were developed aiming to be applied as two-dimensional wound dressings for the treatment of superficial wounds. The effects of genipin cross-linking concentration on the physical and biological properties of the films were investigated. The genipin-cross-linked silk sericin/PVA films showed the increased surface density, tensile strength, and percentage of elongation, but decreased percentage of light transmission, water vapor transmission rate, and water swelling, compared to the non-cross-linked films. This explained that the cross-linking bonds between genipin and silk sericin would reduce the mobility of molecular chains within the films, resulting in the more rigid molecular structure. Silk sericin was released from the genipin-cross-linked films in a sustained manner. In addition, either L929 mouse fibroblast or HaCat keratinocyte cells showed high percentage of viability when cultured on the silk sericin/PVA films cross-linked with 0.075 and 0.1% w/v genipin. Thein vivosafety test performed according to ISO 10993-6 confirmed that the genipin-cross-linked silk sericin/PVA films were safe for the medical usages. The efficacy of the films for the treatment of superficial skin wounds will be further investigatedin vivoand clinically. The genipin-cross-linked silk sericin/PVA films would be promising choices of two-dimensional wound dressings for the treatment of superficial wounds.

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