A Study of Cryostructuring of Polymer Systems. 51. The Combined Influence of Porous Cellulose-Containing Dispersed Fillers and Salting-Out Electrolytes on the Physicochemical Properties of Composite Poly(vinyl alcohol) Cryogels

Enzymatically Functionalized Composite Materials Based on Nanocellulose and Poly(Vinyl Alcohol) Cryogel and Possessing Antimicrobial Activity

“…The measurements were performed up to a 30% deformation. Fusion temperature ( T f ) of the composites was measured as described earlier [20]. For this, a tightly sealed polyethylene test tube containing the material, with a metal ball located in the lower part of its column, was placed upside down into a water bath equipped with a stirrer.…”

“…The physicochemical properties of these cryogels can be controlled by varying the concentration of the initial polymer solution, changing the regime of low-temperature exposure and thawing, and introducing various soluble and insoluble modifiers. In particular, nontoxic cellulose-based disperse fillers improve the gel strength considerably [20] and are of interest for the development of biomedical materials. Among such insoluble modifiers are micro- and nanofibers of bacterial cellulose (BC) [21,22].…”

Cryostructuring of Polymeric Systems. 55. Retrospective View on the More than 40 Years of Studies Performed in the A.N.Nesmeyanov Institute of Organoelement Compounds with Respect of the Cryostructuring Processes in Polymeric Systems

“…For example, proteinaceous cryogel ( Figure 1 F) formed by the freezing of the aqueous feed solution, which, along with a high-molecular precursor (serum albumin), also contained dissolved guanidine hydrochloride and had the gross pores of the oblong ellipsoid shape with the minor axis average size of 15–50 µm and the major axis up to 100–400 µm and even longer. At the same time, in the case of similar matrices prepared in the presence of urea additives, such pores were of roundish appearance [ 272 ], similar to the pores in the Ca-alginate cryostructurate exemplified in Figure 1 H. In general, the additives of such solutes as the low-molecular electrolytes, because of their either salting-in or, in contrast, salting-out abilities, were shown to affect markedly the macroporous characteristics of the respective cryogels and cryostructurates [ 203 , 219 , 246 , 261 , 269 , 387 ]. The same note is also related to the influence of various chaotropes and kosmotropes introduced in the feed solutions prior to the system freezing [ 194 , 195 , 207 , 257 , 267 , 268 , 272 ].…”

“…are of significance. Both manual measurements and computer-assisted approaches have been used for the mathematical treatment of the images obtained with the aid of various types of microscopy (optical [ 170 , 171 , 172 , 206 , 225 , 230 , 231 , 232 , 233 , 234 , 237 , 238 , 240 , 241 , 243 , 244 , 245 , 246 , 250 , 251 , 252 , 256 , 257 , 258 , 259 , 261 , 262 , 263 , 264 , 265 , 267 , 268 , 269 , 270 , 272 , 380 , 383 , 384 , 390 , 393 ], laser confocal [ 369 , 370 , 371 , 372 , 392 ], and SEM [ 173 , 174 , 177 , 179 , 181 , 182 , 184 , 196 , …”

Study of the Effect of Temperature on the Properties of Gelatin-Chitosan Cryogels

“…Professor V.I. Lozinsky made a huge contribution to the development of the cryopolymerization concept [6][7][8][9][10]. Cryogels can be used in controlled drug delivery, carriers for cell immobilization, sensors, bioseparation, purification, and tissue engineering [11,12].…”