Browsing by Author "Tseng, Y. -H."

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Controlling droplet bouncing and coalescence with surfactant
(2016-07)
Pan, K. -L.
;
Tseng, Y. -H.
;
Chen, J. -C.
;
Huang, K. -L.
;
Wang, C. -H.
The collision between aqueous drops in air typically leads to coalescence after impact. Rebounding of the droplets with similar sizes at atmospheric conditions is not generated, unless with significantly large pressure or high impact parameters exhibiting near-grazing collision. Here we demonstrate experimentally the creation of a non-coalescent regime through addition of a small amount of water-soluble surfactant. We perform a direct simulation to account for the continuum and short-range flow dynamics of the approaching interfaces, as affected by the soluble surfactant. Based on the immersed-boundary formulation, a conservative scheme is developed for solving the coupled surface-bulk convection-diffusion concentration equations, which presents excellent mass preservation in the solvent as well as conservation of total surfactant mass. We show that the Marangoni effect, caused by non-uniform distributions of surfactant on the droplet surface and surface tension, induces stresses that oppose the draining of gas in the interstitial gap, and hence prohibits merging of the interfaces. In such gas-liquid systems, the repulsion caused by the addition of surfactant, as frequently observed in liquid-liquid systems such as emulsions in the form of an electric double-layer force, was found to be too weak to dominate in the attainable range of interfacial separation distances. These results thus identify the key mechanisms governing the impact dynamics of surfactant-coated droplets in air and imply the potential of using a small amount of surfactant to manipulate impact outcomes, for example, to prevent coalescence between droplets or interfaces in gases.
Photoinduced hydrophilicity of TiO(2) film as the effect of H(2)O(2) addition
(2010-04-01)
Tseng, Y. -H.
;
Kuo, C. -S.
;
Huang, C. -H.
;
Hirakawa, T.
;
Negishi, N.
TiO(2) thin film photocatalysts coated onto glass plates were prepared by thermal decomposition of tetraisopropyl orthotitanate with a dip-coating process. In this Letter, the mechanism for photoinduced hydrophilicity of TiO(2) film is clarified by adding the extra H(2)O(2) on TiO(2) surface. Results show that the photoinduced hydrophilicity of TiO(2) film is inhibited with the presence of H(2)O(2). The amount of Ti-OH bonds on the surface oppositely increased by the addition of H(2)O(2). It indicates the photoinduced hydrophilicity of TiO(2) results from surface oxygen vacancy, not Ti-OH bonds.
Photoinduced hydrophilicity of TiO2 film as the effect of H2O2 addition
(2010-04-01)
Tseng, Y. -H.
;
Kuo, C. -S.
;
Huang, C. -H.
;
Hirakawa, T.
;
Negishi, N.
TiO2 thin film photocatalysts coated onto glass plates were prepared by thermal decomposition of tetraisopropyl orthotitanate with a dip-coating process. In this Letter, the mechanism for photoinduced hydrophilicity of TiO2 film is clarified by adding the extra H2O2 on TiO2 surface. Results show that the photoinduced hydrophilicity of TiO2 film is inhibited with the presence of H2O2. The amount of Ti-OH bonds on the surface oppositely increased by the addition of H2O2. It indicates the photoinduced hydrophilicity of TiO2 results from surface oxygen vacancy, not Ti-OH bonds.