Polyion complex fiber and capsule formed by self-assembly of chitosan and gellan at solution interfaces

Interfacial Polyelectrolyte Complex Spinning of Cellulose Nanofibrils for Advanced Bicomponent Fibers

“…This leads us to suggest, in accordance with most previous works, that at the interface of the two components forms a load-bearing strong skin that prevents diffusion of the polycation deep into the filament, resulting in a core-shell strucutre. 42,48,[57][58][59][60] The majority solid component was interpreted to be TOCN based on the color of the wet filament (see Figure 1c) when using dyed TOCN dispersion (blue) and polycation solution (pink, PDADMAC).…”

Polyelectrolyte complex materials from chitosan and gellan gum

“…Up to date, a limited number of CH-GG polyelectrolyte complexes have been reported as the focus has been on the development of capsules and fibers [161][162][163][164][165][166][167] . For example, Yamamoto and co-workers studied the characteristic structures of the interface between CH-GG due to charge overcompensation on the formation of fibers and capsule 162 .…”

“…For example, Yamamoto and co-workers studied the characteristic structures of the interface between CH-GG due to charge overcompensation on the formation of fibers and capsule 162 . This interface reaction could form a hemisphere, honeycomb shape or spaced droplets of polyelectrolyte complex.…”

“…The challenge faced in the formation of a CH-GG PEC-film is to prevent the formation of a precipitate in the form of fibers or a capsule 162,163,167,294 Films were prepared by evaporative casting, i.e. solutions or dispersions were deposited onto an acrylic plate and allowed to dry for 2 days under controlled conditions (21 °C, 60 ± 10% relative humidity, RH) (Figure 2.1).…”

“…In contrast, chitosan (CH) and gellan gum (GG) solutions are unable to be mixed together due to insoluble gellan gum in acidic medium. The mixing between CH and GG solutions results in the formation of a precipitate due to charge overcompensation at the interface in the form of fibres, capsules or coacervate structures depending on the complexation conditions 162,163,167,294 . There are no literature reports on the formation of CH-GG PEC-films.…”