Surface Modification of Diamond Powder with Formaldehyde Solution

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  • VISBAL Heidy
    Nagaoka Gijutsu-Kagaku Daigaku (Nagaoka University of Technology)
  • ISHIZAKI Chanel
    Nagaoka Gijutsu-Kagaku Daigaku (Nagaoka University of Technology)
  • ISHIZAKI Kozo
    Nagaoka Gijutsu-Kagaku Daigaku (Nagaoka University of Technology)

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  • ホルムアルデヒド溶液を用いたダイヤモンド粉末の表面処理

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Abstract

Surface modification of diamond powder (5-12 μm) was achieved using a water-saturated solution of formaldehyde. The effects of the reaction temperature and time were studied. The diamond surface was characterized by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy. Four chemical structures; epoxy (-C-O-C-), aliphatic ether (-C-O-C-) as well as methyl (-CH3) and methyne (-CH) bands were identified in the diamond surface after the treatment. The total intensity of the bands increases proportionally by augmenting the treatment time and temperature. The absorbance intensity of all bands correlates linearly. An activation energy of 34.7 kJ mol-1 was obtained, that is in the range of a chemisorption reaction energy. From the results it is concluded that methyl formate (HCOOCH3) was chemisorbed on the diamond surface to a carbon with two unsaturated valences.<br>

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