石鹸水溶液中の繊維に対するカーボンブラック粒子の付着と脱離に関する界面自由エネルギーの役割
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概要
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An attachment of the hydrophobic or hydrophilic carbon black particles to substrates of fiber materials (cellulose, polyester and nylon) and detachment from substrates in aqueous solutions of fatty acid soap were discussed as to be associated with interfacial free energies interaction between particle/substrate, particle/liquid, and substrate/liquid interfaces and the potential energies due to the interaction of the dissimilar electrical double layers. The values of free energies at the contacting surfaces composed of the three components (dispersion force, polar force and hydrogen bonding force) were calculated from values of contact angle and surface tension. The degree of attachment of the particles to the substrates increased with hydrogen bonding force at the interfaces (e. g., cellulose or the hydrophilic carbon black). The effect of the hydrogen bonding force component was superior to that of other components, but the presence of soap in the bath caused as substantial decrease of the hydrogen bonding components, and a significant reduction of the degree of the attachment was followed by that. Consequently, it was recognized that the soiling in the soap solution was prevented with the reduction of hydrogen bonding force due to adsorption of the soap on the surfaces of particles and substrates. The influence of hydrogen bonding force on the attachment was more effectively than that of the repulsive force due to the electrical double layers. Similarly, the presence of soap contributed to an increase in removal of particles from the substrates because the redeposition of the particles were prevented.
- 1990-08-15
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