Biocompatible stimuli-responsive hydrogel porous membranes via phase separation of a polyvinyl alcohol and Na-alginate intermolecular complex

2012 ◽  
Vol 22 (37) ◽  
pp. 19482 ◽  
Author(s):  
Venkateshwarlu Gopishetty ◽  
Ihor Tokarev ◽  
Sergiy Minko
Keyword(s):  
Phase Separation ◽  
Polyvinyl Alcohol ◽  
Porous Membranes ◽  
Stimuli Responsive ◽  
Intermolecular Complex

scholarly journals Durability and Recoverability of Soft Lithographically Patterned Hydrogel Molds for the Formation of Phase Separation Membranes

Micromachines ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 108
Author(s):  
Asad Asad ◽  
Masoud Rastgar ◽  
Hadi Nazaripoor ◽  
Mohtada Sadrzadeh ◽  
Dan Sameoto
Keyword(s):  
Phase Separation ◽  
Solvent Extraction ◽  
Cold Treatment ◽  
Porous Membranes ◽  
Separation Processes ◽  
Separation Membranes ◽  
Membrane Fabrication ◽  
Phase Separation Process ◽  
Continuous Use ◽  
Recovery Result

Hydrogel-facilitated phase separation (HFPS) has recently been applied to make microstructured porous membranes by modified phase separation processes. In HFPS, a soft lithographically patterned hydrogel mold is used as a water content source that initiates the phase separation process in membrane fabrication. However, after each membrane casting, the hydrogel content changes due to the diffusion of organic solvent into the hydrogel from the original membrane solution. The absorption of solvent into the hydrogel mold limits the continuous use of the mold in repeated membrane casts. In this study, we investigated a simple treatment process for hydrogel mold recovery, consisting of warm and cold treatment steps to provide solvent extraction without changing the hydrogel mold integrity. The best recovery result was 96%, which was obtained by placing the hydrogel in a warm water bath (50 °C) for 10 min followed by immersing in a cold bath (23 °C) for 4 min and finally 4 min drying in air. This recovery was attributed to nearly complete solvent extraction without any deformation of the hydrogel structure. The reusability of hydrogel can assist in the development of a continuous membrane fabrication process using HFPS.

Monolithic polyaniline/polyvinyl alcohol nanocomposite actuators with tunable stimuli-responsive properties

2010 ◽  
Vol 145 (2) ◽  
pp. 839-846 ◽  
Author(s):  
Hainan Gao ◽  
Junhu Zhang ◽  
Weili Yu ◽  
Yunfeng Li ◽  
Shoujun Zhu ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Stimuli Responsive
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