Мақола

Formation of Water-Free Cavity in the Process of Nafion Swelling in a Cell of Limited Volume; Effect of Polymer Fibers Unwinding

Barry W. NinhamDepartment of Applied Mathematics, The Australian National University, Acton, ACT 2601, AustraliaPolina N. BolotskovaDepartment of Fundamental Sciences, Bauman Moscow State Technical University, 2-nd Baumanskaya str. 5, 105005 Moscow, RussiaSergey V. GudkovDepartment Biophysics, Lobachevsky State University of Nizhni Novgorod, Gagarina Ave., 23, 603950 Nizhni Novgorod, RussiaYulchi JuraevDepartment of Theoretical Physics and Quantum Electronics, Samarkand State University, University blv. 15, Samarkand City 140104, UzbekistanM. S. Kir’yanovaDepartment of Fundamental Sciences, Bauman Moscow State Technical University, 2-nd Baumanskaya str. 5, 105005 Moscow, RussiaВ. А. КозловDepartment of Fundamental Sciences, Bauman Moscow State Technical University, 2-nd Baumanskaya str. 5, 105005 Moscow, RussiaR. S. SafronenkovDepartment of Fundamental Sciences, Bauman Moscow State Technical University, 2-nd Baumanskaya str. 5, 105005 Moscow, RussiaA. V. ShkirinProkhorov General Physics Institute of the Russian Academy of Sciences, Vavilova str. 38, 119991 Moscow, RussiaE. V. UspenskayaDepartment of Pharmaceutical and Toxicological Chemistry, RUDN University, Miklukho-Maklaya str. 6, 117198 Moscow, RussiaN. F. BunkinDepartment of Fundamental Sciences, Bauman Moscow State Technical University, 2-nd Baumanskaya str. 5, 105005 Moscow, Russia

Polymersjournal2020en

ABI

Аннотация

When Nafion swells in water, colloidal particles are repelled from the polymer surface; this effect is called the formation exclusion zone (EZ), and the EZ size amounts to several hundred microns. However, still no one has investigated the EZ formation in a cell whose dimension is close to the EZ size. It was also shown that, upon swelling in water, Nafion fibers "unwind" into the water bulk. In the case of a cell of limited volume, unwound fibers abut against the cell windows, and water is completely pushed out from the region between the polymer and the cell window, resulting in a cavity appearance. The temporal dynamics of the collapse of this cavity was studied depending on the cell size. It is shown that the cavity formation occurs due to long-range forces between polymer strands. It turned out that this scenario depends on the isotopic composition of the water, ionic additives and water pretreatment. The role of nanobubbles in the formation and collapse of the cavity were analyzed. The results obtained allowed us to conclude that the EZ formation is precisely due to the unwinding of polymer fibers into the liquid bulk.

Ҳали таржима қилинмаган

Мавзулар

Chemical and Physical Studies Biofield Effects and Biophysics Magnetic and Electromagnetic Effects

Идентификаторлар

DOI: 10.3390/polym12122888

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