Study on adsorption of cationic dye on novel kappa-carrageenan/poly(vinyl alcohol)/montmorillonite nanocomposite hydrogels

2015 ◽  
Vol 72 (6) ◽  
pp. 1339-1363 ◽  
Author(s):  
Hossein Hosseinzadeh ◽  
Shiva Zoroufi ◽  
Gholam Reza Mahdavinia
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Cationic Dye ◽  
Nanocomposite Hydrogels ◽  
Kappa Carrageenan

scholarly journals Physically Crosslinked Poly (Vinyl Alcohol)/Kappa-Carrageenan Hydrogels: Structure and Applications

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 560 ◽  
Author(s):  
Catalin Croitoru ◽  
Mihai Alin Pop ◽  
Tibor Bedo ◽  
Mihaela Cosnita ◽  
Ionut Claudiu Roata ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Diffusion Coefficients ◽  
Vinyl Alcohol ◽  
Weight Ratio ◽  
Poly Vinyl Alcohol ◽  
Distilled Water ◽  
Cationic Dye ◽  
Structure Morphology ◽  
Physically Crosslinked ◽  
Kappa Carrageenan

This paper discusses the structure morphology and the thermal and swelling behavior of physically crosslinked hydrogels, obtained from applying four successive freezing–thawing cycles to poly (vinyl alcohol) blended with various amounts of κ-carrageenan. The addition of carrageenan in a weight ratio of 0.5 determines a twofold increase in the swelling degree and the early diffusion coefficients of the hydrogels when immersed in distilled water, due to a decrease in the crystallinity of the polymer matrix. The diffusion of water into the polymer matrix could be considered as a relaxation-controlled transport (anomalous diffusion). The presence of the sulfate groups determines an increased affinity of the hydrogels towards crystal violet cationic dye. A maximum physisorption capacity of up to 121.4 mg/g for this dye was attained at equilibrium.

scholarly journals Macrophages, the main marker in biocompatibility evaluation of new hydrogels after subcutaneous implantation in rats

2021 ◽  
pp. 088532822110461
Author(s):  
Tijana Lužajić Božinovski ◽  
Vera Todorović ◽  
Ivan Milošević ◽  
Bogomir Bolka Prokić ◽  
Vladimir Gajdov ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Giant Cells ◽  
Surface Interactions ◽  
Poly Vinyl Alcohol ◽  
Nanocomposite Hydrogels ◽  
Tissue Sections ◽  
Biological Responses ◽  
Statistical Relevance ◽  
Biomaterial Surface

Biocompatibility of materials is one of the most important conditions for their successful application in tissue regeneration and repair. Cell-surface interactions stimulate adhesion and activation of macrophages whose acquaintance can assist in designing novel biomaterials that promote favorable macrophage–biomaterial surface interactions for clinical application. This study is designed to determine the distribution and number of macrophages as a means of biocompatibility evaluation of two newly synthesized materials [silver/poly(vinyl alcohol) (Ag/PVA) and silver/poly(vinyl alcohol)/graphene (Ag/PVA/Gr) nanocomposite hydrogels] in vivo, with approval of the Ethics Committee of the Faculty of Veterinary Medicine, University of Belgrade. Macrophages and giant cells were analyzed in tissue sections stained by routine H&E and immunohistochemical methods (CD68+). Statistical relevance was determined in the statistical software package SPSS 20 (IBM corp). The results of the study in terms of the number of giant cells localized around the implant showed that their number was highest on the seventh postoperative day (p.o.d.) in the group implanted with Ag/PVA hydrogels, and on the 30th p.o.d. in the group implanted with Ag/PVA/Gr. Interestingly, the number of macrophages measured in the capsular and pericapsular space was highest in the group implanted with the commercial Suprasorb© material. The increased macrophage number, registered around the Ag/PVA/Gr implant on 60th p.o.d. indicates that the addition of graphene can, in a specific way, modulate different biological responses of tissues in the process of wound healing, regeneration, and integration.

Removal of Methylene Blue from Aqueous Solutions Using Poly(vinyl alcohol)/Montmorillonite Nanocomposite Hydrogels: Taguchi Optimization

2019 ◽  
Vol 27 (10) ◽  
pp. 2239-2249 ◽  
Author(s):  
Ehsan Roufegari-Nejhad ◽  
Mohammad Sirousazar ◽  
Vahid Abbasi-Chiyaneh ◽  
Farshad Kheiri
Keyword(s):  
Methylene Blue ◽  
Aqueous Solutions ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Taguchi Optimization ◽  
Nanocomposite Hydrogels

scholarly journals Anisotropic tough poly(vinyl alcohol)/graphene oxide nanocomposite hydrogels for potential biomedical applications

RSC Advances ◽  
2018 ◽  
Vol 8 (24) ◽  
pp. 13284-13291 ◽  
Author(s):  
Qiaomei Luo ◽  
Yangyang Shan ◽  
Xia Zuo ◽  
Jiaqi Liu
Keyword(s):  
Mechanical Properties ◽  
Graphene Oxide ◽  
Vinyl Alcohol ◽  
Biomedical Applications ◽  
Poly Vinyl Alcohol ◽  
Nanocomposite Hydrogel ◽  
Nanocomposite Hydrogels

Tough PVA/GO nanocomposite hydrogel with well-developed anisotropic microstructure and excellent mechanical properties.

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