title: Ultrasound stimulus effect on hydrogen bonding in networked alumina and polyacrylic acid slurry.
abstract: The influence of ultrasound (US) on the viscosity of aqueous slurry composing polyacrylic acid (PAA) and alumina was studied. For exposure to an aqueous slurry solution, US waves emitted at three different frequencies of 28, 45, and 100 kHz were used. Results show that the stimulus effect of US on viscosity change was a breakage of the hydrogen bonding networks of alumina and PAA in the slurry solution. That decrease in viscosity was enhanced strongly by US exposure as the output power was increased from 175 to 300 W. In addition, a lower US frequency was effective for slurry viscosity reduction. The reduced viscosity of the slurry also depended on the solution pH. After US was stopped, the viscosity increased gradually and recovered to its original value within about 15 min. The stimulus effect on the viscosity change was cycled by US.
authors.affiliation: Department of Materials Science and Technology, Nagaoka University of Technology, Kamitomioka 1603-1, Nagaoka 940-2188, Japan.
authors.forename: Ngo Le
authors.initials: NL
authors.lastname: Ngoc
authors.forename: Kobayashi
authors.initials: K
authors.lastname: Takaomi
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry* / Q000528:radiation effects*; D000537:Aluminum Oxide / Q000737:chemistry* / Q000528:radiation effects*; D006860:Hydrogen Bonding / Q000528:radiation effects; D011829:Radiation Dosage; D012996:Solutions; D013010:Sonication / Q000379:methods*; D014783:Viscosity
chemical_list: D000180:Acrylic Resins; D012996:Solutions; C006903:carbopol 940; D000537:Aluminum Oxide