Electrorheological properties of chitosan nitrate suspension

Huo, Li; Liao, Fuhui; Li, Junran; Zhang, Shaohua; Zhang, Olivia; Ma, Shenglin; Xu, Ming; Lu, Yao

doi:10.1016/j.colsurfa.2007.08.039

Cited by 6 publications

(2 citation statements)

References 26 publications

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“…The chitosan has properties of good dispersion in an oil phase and stabilizer for an emulsion system . Because of these merits such as biodegradation property, a source of abundant supply, and good dispersion-stability, we and other research groups have synthesized modified chitosans for solving the above problems. − …”

Section: Introductionmentioning

confidence: 99%

Gelation of Chitin and Chitosan Dispersed Suspensions under Electric Field: Effect of Degree of Deacetylation

Shin

Choi

et al. 2011

ACS Appl. Mater. Interfaces

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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 rheological and electric properties of ER suspensions.

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Section: Introductionmentioning

confidence: 99%

Gelation of Chitin and Chitosan Dispersed Suspensions under Electric Field: Effect of Degree of Deacetylation

Shin

Choi

et al. 2011

ACS Appl. Mater. Interfaces

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“…ER activity decreases significantly around 50 C and thus the temperature instability limits the potential use of ER fluids. The conductive, dielectric and surface properties of several water-free polymeric or inorganic material based ER fluids were investigated by various scientists [4,[32][33]. The ER properties of biocompatible chitosan and chitosan derivatives as dispersed phases have been investigated [33].…”

Section: Electrorheological (Er) Fluidsmentioning

confidence: 99%

Field Responsive Fluids - A Review

Genç¹,

Derin

2012

KEM

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Magnetorheological (MR), Electrorheological (ER), and Ferrofluids are considered as a class of smart materials due to their novel behavior under an external stimulus such as a magnetic and electrical field. The behavior of these synthetic fluids offer techniques for achieving efficient heat and mass transfer, damping, drag reduction, wetting, fluidization, sealing, and more. Magnetorheological fluids are suspensions of non-colloidal, multi-domain and magnetically soft particles organic and aqueous liquids. Electrorheological fluids are suspensions of electrically polarizable particles dispersed in electrically insulating oil. Ferrofluids are known as magnetic liquids that are colloidal suspensions of ultrafine, single domain magnetic particles in either aqueous or non-aqueous liquids. In this review article a history of these fluids is given, together with a description of their synthesis in terms of stability and redisperibility and how it is understood in various parts of the science and technology. Then the structural changes and rheological properties of these smart fluids under an external stimulus together with a series of applications are presented.

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