Effect of Solvent Composition on Porosity, Surface Morphology and Thermal Behavior of Metal Alginate Prepared from Algae (Undaria pinnatifida)

Effect of calcium ion (cross-linker) concentration on porosity, surface morphology and thermal behavior of calcium alginates prepared from algae (Undaria pinnatifida)

“…The total intrusion volume as well as porosity % of calcium alginates at higher concentration is lower compared to at lower concentration of cross-linker as it is seen in Table 2, due to more packed arrangement of alginate molecule at higher concentration of cross-linker. We observed in our previous study also (Pathak, Yun, Lee, Baek, & Paeng, 2009b) that with increase in cross-linker (zinc and cadmium) concentration, the total intrusion volume decreases. The same reason for decreasing total intrusion volume with increasing cross-linker concentration is applied in this study.…”

Microstructure of polymer hydrogels studied by pulsed field gradient NMR diffusion and TEM methods

“…The combination of CaCO 3 as an insoluble Ca 2+ salt and glucono-d-lactone (GDL) as a proton donor has the advantage that the pH of the final gel is unchanged from the solution by the addition of stoichiometric amounts of CaCO 3 and GDL. 25,26 The effect of solvent composition on the microstructure of alginate gels is reported by Pathak et al 27 It has been shown that the use of methanol-water mixtures for gel preparation decreases the pore volume of the gel and a more dense network structure is obtained. The addition of methanol gives rise to more extended polymer chains and hence to an increase of polymer chain entanglements, also for pection.…”

Bio-based nickel alginate and copper alginate films with excellent flame retardancy: preparation, flammability and thermal degradation behavior

“…5 In recent decades, the development of alginate has gained interest as an alternative source of biomass and a potential spinning feedstock. 6 Alginate, a kind of biomass derived from algae, 7,8 is a polyelectrolyte and a linear copolymer composed of b-1,4-Dmannuronate (M) and a-1,4-L-guluronate (G) repeating monomeric units. Sodium alginate is soluble in water, forming very viscous solutions or jellies depending on the concentration.…”