Stimuli-responsive viscosity modifiers

Adv Colloid Interface Sci. 2023 Oct 16;321:103025. doi: 10.1016/j.cis.2023.103025. Online ahead of print.ABSTRACTStimuli responsive viscosity modifiers entail an important class of materials which allow for smart material formation utilizing various stimuli for switching such as pH, temperature, light and salinity. They have seen applications in the biomedical space including tissue engineering and drug delivery, wherein stimuli responsive hydrogels and polymeric vessels have been extensively applied. Applications have also been seen in other domains like the energy sector and automobile industry, in technologies such as enhanced oil recovery. The chemistry and microstructural arrangements of the aqueous morphologies of dissolved materials are usually sensitive to the aforementioned stimuli which subsequently results in rheological sensitivity as well. Herein, we overview different structures capable of viscosity modification as well as go over the rheological theory associated with classical systems studied in literature. A detailed analysis allows us to explore correlations between commonly discussed models such as molecular packing parameter, tube reptation and stress relaxation with structural and rheological changes. We then present five primary mechanisms corresponding to stimuli responsive viscosity modification: (i) packing parameter modification via functional group conditioning and (ii) via dynamic bond formation, (iii) mesh formation by interlinking of network node...

Source: Advances in Colloid and Interface Science - October 23, 2023 Category: Chemistry Authors: Bhargavi Bhat Silabrata Pahari Joseph Sang-Il Kwon Mustafa E S Akbulut Source Type: research