Ko, Young Gun Lee, Hyun Jeong Shin, Seung Su Choi, Ung Su 2024-01-20T14:33:37Z 2024-01-20T14:33:37Z 2021-09-05 2012-06 1744-683X https://pubs.kist.re.kr/handle/201004/129187 Herein, the electrorheological (ER) properties of highly dispersion-stable, biocompatible and biodegradable chitosan derivative dispersed ER suspensions are explored. Electro-mechanical responses of the ER suspensions are enhanced with fixed spacers (amide and ester groups) and various functional groups (acid series and their complex forms with urea). A noteworthy result is that the shear stress of urea complexed chitosan acid dispersed suspensions was higher than before doping the urea molecule. However, urea complexed chitosan phosphate and sulphate showed a decreased tendency of shear stress due to too high conductivity at the high temperature. In the dispersion stability test, the chitosan dispersed suspensions showed high dispersion stability for long times. The study of the influence of dipolar molecules on the ER properties of the chitosan derivative dispersed suspensions under an electric field shows how to enhance the ER responses easily just by doping molecules. English ROYAL SOC CHEMISTRY Dipolar-molecule complexed chitosan carboxylate, phosphate, and sulphate dispersed electrorheological suspensions Article 10.1039/c2sm25250c 1 SOFT MATTER, v.8, no.23, pp.6273 - 6279 SOFT MATTER 8 23 6273 6279 N scie scopus 000304309300012 2-s2.0-84864512840 Chemistry, Physical Materials Science, Multidisciplinary Physics, Multidisciplinary Polymer Science Chemistry Materials Science Physics Polymer Science Article ELECTRIC-FIELD SHEAR BEHAVIOR FLUIDS GELATION ACID ION ER fluid Chitosan carboxylate Chitosan Sulpate Chitosan phosphate Dipole molecule