Ko, Young Gun Shin, Seung Su Choi, Ung Su Park, Yong Sung Woo, Je Wan 2024-01-20T17:05:19Z 2024-01-20T17:05:19Z 2021-09-02 2011-04 1944-8244 https://pubs.kist.re.kr/handle/201004/130484 Herein, the effect of the degree of deacetylation (DD) on the gelation of the chitosan dispersed suspension as an electrorheological (ER) fluid under an electric field is presented. The fluids were prepared by dispersing the chitin and the chitosan particles having various DDs into silicone oil, and they were evaluated under various electric fields. The alignment of chitosan particles in the fluid was also observed using an optical microscope under the electric field. The formed fibrous structure between electrodes are though to continue to the viscosity increase, because an attempt to move one electrode relative to the order would be hindered by the drag of the dangling fibrils. A noteworthy result is that the region of the frequency for gel state of the ER fluids increased in the order of chitosan DD 99.3, 93.4, 73.2, 83.8, and 87.3% under electric fields while the modulus of the fluids increased in the reverse order. This order was well-matched with the result of dielectric constants and yield stresses of ER fluids. The study of influence of DD on the gelation of the chitosan dispersed suspension under an electric field shows the relevance of the chemical composition of the heteropolysaccharide (chitin-chitosan copolymer) to the theological and electric properties of ER suspensions. English American Chemical Society Gelation of Chitin and Chitosan Dispersed Suspensions under Electric Field: Effect of Degree of Deacetylation Article 10.1021/am200091r 1 ACS Applied Materials & Interfaces, v.3, no.4, pp.1289 - 1298 ACS Applied Materials & Interfaces 3 4 1289 1298 N scie scopus 000289762400051 2-s2.0-84862832959 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article ELECTRORHEOLOGICAL PROPERTIES SHEAR BEHAVIOR MOLECULAR-WEIGHT FT-IR DEGRADATION EFFICIENCY CHEMISTRY CELLULOSE FLUID ION chitin chitosan electric field electrorheology gelation