MgOへのジメチルホルムアミドおよびジメチルスルホキシドの吸着

概要

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The mechanism of the Rebinder effects in nonmetallic solids is proposed from the point of view of the formation of barrier against the dislocation movement caused by strong chemisorption. The infrared and electronic absorption spectra of N, N-dimethylformamide, hereunder to be symbolized DMFA, adsorbed on the surface of MgO, indicate that its larger portion is adsorbed by the hydrogen bond formation with surface OH group, and that the rest of DMFA is found strongly adsorbed on Lewis on surface OH group acid center, forming a charge transfar surface complex. The spectra show also that, in the case of dimethylsulfoxide, hereunder to be symbolized DMSO, some is found adsorbed by the hydrogen bond and that the rest is adsorbed on Lewis acid center. There was less mobility of near-surface edge dislocation in theca se of the MgO immersed in DMSO than in the case of the MgO immersed in DMFA. The difference in mobility may be attributed to the difference in interaction of adsorbate with the Lewis acid center. The electric and elastic interactions between near-surface edge dislocation and the "adsorption-induced surface defect" are discussed semiquantitatively.
社団法人日本材料学会の論文
1970-06-15