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    Effects of water-soluble polymers dissolved in an aqueous secondary fluid on the rheological properties of capillary suspensions

    Year: 2022

    Journal: Korea-Aust. Rheol. J., Volume 34, MAY, page 159–166

    Authors: Yang, Jeewon; Kim, Jieun; Lee, Joohyung

    Organizations: Basic Science Research Program through National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2018R1D1A1A02085492]; Nano.Material Technology Development Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Future Planning [2009-0082580]; Korea Institute for Advancement of Technology (KIAT) - Korea Government (MOTIE) [P0008475]

    Keywords: Capillary suspension; Water-soluble polymer; Cellulose; Yield stress; Colloidal processing

    Ternary colloidal or capillary suspensions comprising bulk and secondary fluids (S) and particles have attracted considerable attention in recent years. The addition of a suitable S can readily initiate the transition of a fluid-like pre-mixture into a gel-like capillary suspension. However, the precise control of rheological properties of such suspensions in the gel state is still challenging. In this study, we investigated the effects of the addition of various water-soluble polymers in an aqueous S on the rheological properties of the capillary suspensions. Results suggest that all the investigated systems maintained the gel state. Cellulose-type polymers with high molecular weights increased the sample strength, which was attributed to the gelation and reduced rupture of interparticle capillary bridges. In contrast, the non-cellulose-type polymers decreased the sample strength, which may be attributed to the interparticle repulsion and/or decrease in the capillary force. We believe this study will aid the design of various industrial complex fluids that often contain multiple immiscible fluids and polymeric additives.
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