Effects of ultrasonic treatment on aqueous suspensions of diamond nanopowders

Himia, Fizika ta Tehnologia Poverhni Pub Date : 2023-06-30 DOI:10.15407/hftp14.02.223

G. Ilnytska, O. B. Loginova, S. Starik, S. O. Lisovenko, G. Bazaliy, N. N. Tsyba

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Abstract

It has been found that ultrasonic treatment of diamond nanopowders contributes to surface cleaning due to the removal of non-diamond carbon and impurities from the surface boundary of nanodiamond grains (from 0.4 and 0.32 % for ASUD-99 and 0.67 and 0.55 % for ASUD 75, respectively). It does not affect the total sorption volume and the values of the specific surface of the studied samples do not change, but it changes the composition of groups on the surface of diamond nanoparticles, which affect its hydrophilicity. In the samples of АSUD-75 after ultrasonic treatment, a redistribution of the ratio of the intensities of valence vibrations of С=О bonds in the lactone (anhydride) group (1742 cm–1) and the quinone (carboxyl) group (1683 cm–1) is observed, which indicates the decay of the lactone ring and its transformation into carbonyl and carboxyl groups. All samples of АSUD-99 have a hydroxyl group O-H (3400 cm−1), which does not change significantly under the influence of ultrasound. This explains the noticeable change in agglomeration for ASUD-75 in contrast to ASUD 99.

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超声处理对金刚石纳米粉水悬浮液的影响

研究发现，超声处理金刚石纳米粉末有助于表面清洁，因为纳米金刚石颗粒表面边界的非金刚石碳和杂质被去除(ASUD-99的0.4和0.32%，ASUD 75的0.67和0.55%分别)。它不影响所研究样品的总吸附体积和比表面积值，但它改变了金刚石纳米颗粒表面的基团组成，从而影响其亲水性。超声波处理后的АSUD-75样品中，内酯(酸酐)基团(1742 cm-1)和醌(羧基)基团(1683 cm-1)中С=О键的价振强度之比发生了重新分布，表明内酯环发生了衰变，转变为羰基和羧基。所有的АSUD-99样品都有一个羟基O-H (3400 cm−1)，在超声波的影响下没有明显的变化。这就解释了与ASUD- 99相比，ASUD-75在凝聚方面的显著变化。

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Himia, Fizika ta Tehnologia Poverhni

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