Surface modification of diamond powders by sonochemical reaction

Abstract

Diamond powders are used for polishing electronics devices such as hard disk substrates. The surface profile of the polished texture affects the final properties of hard disk and so polishing materials and polishing process are very important. Polishing materials have to be dispersed homogeneously without aggregation. Many dispersants are then developed to improve the dispersion property of polishing materials, whereas improvement of the surface properties of polishing materials using dispersant is not essential. In this study, an attempt was made to modi@ the surface of diamond powders using acoustic cavitation generated by irradiation of strong ultrasonic wave on aqueous diamond slurry. As a result, the diamond particle surface was verified to be modified by the oxidizing action of active oxygen species formed by acoustic cavitation. IEEE ULTRASONICS SYMPOSIUM-431 0-7803-7177-

Steel dust catalysis for Fenton-like oxidation of polychlorinated dibenzo-p-dioxins

“…In this investigation, surface modification and increased dispersion were used by following the sonochemical procedure [44]. A chemical acid etchant (HCl) with 20 kHz ultrasound produced surface-cleaned iron particles, less aggregated clusters and, therefore, increased catalytic active sites of the steel dust.…”

“…Mantel et al also employed a chemical etchant to pretreat steel surfaces [53]. And Uchida et al insisted that surface modification of polishing particles could improve the utilization of OH radicals and that surface modification using a sonochemical method would maintain a good dispersity [44].…”

Disaggregation and surface modification of nano‐size diamond by ultrasound exposure: Relationships among acoustic intensity, disaggregation, and surface modification

“…However, when these methods are used, such problems as (1) unstable dispersal effects, (2) poor reproducibility, and (3) reduced polishing efficiency due to adherence of surfactants are encountered [6][7][8]. We attempted to disaggregate nano-diamonds by exposing a nano-diamond suspension fluid to ultrasound in order to generate acoustic cavitation.…”

Ultrasonic Treatment of Acid-Washed Diamond Powder Surface

“…Tsubota et al reported a method to reform oxidized diamond surfaces with silane coupling agents. 4) Uchida et al proposed surface modi®ca-tion of diamond powders by sonochemical reactions, 5) however, the chemical reactivity, as well as the physical properties, of the sonochemically modi®ed diamond surface remains unclear to date. The objectives of this study are to clarify the eects of sonochemical reactions and identify the functional groups present on acid-washed diamond surfaces after ultrasonic treatment using diused re¯ectance infrared Fourier transform (DRIFT) spectroscopy and X-ray photoelectron spectroscopy (XPS) techniques.…”