Electrorheological Effects of Synthesized Octa-cyanopropylsilsesquioxane Cage Structure

Abstract

This article introduces a new electrorheological (ER) fluid. A molecular cage structure for electrorheological applications has been synthesized, and the ER behavior of the octa-functionalized polyhedral oligomeric silsesquioxane (POSS) variant in silicone oil (PDMS) has been shown. The hydrolyzation route has been used in the synthesis, the microstructure has been displayed using scanning electron microscopy, the yield has been ascertained, and the compound has been characterized. The rheological properties are demonstrated on the ER fluid through steady flow and oscillatory tests to investigate the effects of change in concentration on the functional group attached to the inorganic silicon–oxygen core structure of the POSS compound. The electrorheological efficiency was analyzed, and dielectric characterization was done. The flow curve was described by the Herschel–Bulkley model, and yield stress values were derived from the model. The octa-cyanoPOSS/PDMS electrorheological fluid has been shown to have ER activity.

Comparing the Electrorheological Effect of Polyhedral Silsesquioxane Cage Structures with Different Numbers of Cyanopropyl Functional Groups

“…The dielectric particles within the suspension, therefore, breakdown as the electric field strength is increased beyond its breakdown voltage, and it acts as an electrical conductor with electrostatic discharge. Thus, the yield stress for the suspensions at increased concentrations go through a maximum at 3 kV/mm and then drops. , …”

“…Thus, the yield stress for the suspensions at increased concentrations go through a maximum at 3 kV/mm and then drops. 4,13…”

“…In our previous work, 4 the hydrolyzation route used by Dare et al 8 was adopted to synthesize the 8 CN-POSS cage structure. The suspensions of both 1 CN-POSS, which is commercially available, and 8 CN-POSS have been compared in this work.…”

“…We recently showed that a new class of ER fluid (octafunctionalized POSS variant in PDMS) exhibited an ER effect. This new POSS cage structure for ER applications was synthesized in our previous work 4 using the hydrolyzation route and was characterized. The dielectric study was done, and rheological properties were examined.…”

Is Chitosan the Promising Candidate for Filler in Nature-Friendly Electrorheological Fluids?

“…The practical application of ERF is extremely wide and includes shock dampers, brakes, clutches, valves, and haptic devices. The recent advances in electrorheology open new applications, such as polishing, smart bike, robotics, Braille readers, crude oil transportation, food processing, etc. − As fillers for ERFs, particles of various origin, such as silica, metal oxides, − clays, , graphene oxide, , carbon nanotubes, , conducting polymers, , poly­(ionic liquid)­s, , silsesquioxane (ladder polymer) and their derivates, − composites and hybrids − are used.…”