This study investigated the ζ potential of microbubbles in aqueous solutions and revealed that the bubbles were negatively charged under a wide range of pH conditions. Further, the stability of calcium carbonate suspension mainly depends on an electrostatic repulsion force given by the classical DLVO theory.read more read lessĪbstract: Microbubbles are very fine bubbles and appropriate for the investigation of the gas−water interface electrical charge, because of their long stagnation, due to slow buoyancy, in the electrophoresis cell observation area. The yield stresses of suspensions determined by Casson’s plots were postulated to present the persistency of stagnant bulk state of dispersions near zero shear rate and inverse to the square of zeta potential. Since the zeta potential presents the potential at shear plane, practically it is responsible for the interaction of particles and the destabilization of solution structure at yield stress (τ0). The co-adsorption of stearate and calcium ion indicated a strong interaction of calcium ion with solid/liquid interface at low concentrations, however, showed a similar trend with the case of stearate at high concentrations. At the high concentration of stearate, zeta potentials varied with the surface state of adsorbed surfactant layer. The zeta potentials of calcium carbonate particles were fluctuated strongly by the co-adsorption of stearate molecules and calcium ions, showing the counter effect on the potential change. At high pH, the less polar the surfactant, the more negative the charge, since nonpolar surfactant molecules induce the adsorption of OH− ions, rather than H+ ions that prefer hydration by water molecules.read more read lessĪbstract: The adsorptions of sodium stearate and calcium ion on calcium carbonate particles in aqueous media were investigated in terms of zeta potential and yield stress. Even with a very high concentration of H+ ions in solution the bubbles are charged negatively because the interface is covered with slightly acidic alcohol groups of AGs. For nonionic AG, a possible charging mechanism based on known mechanisms is suggested to explain the negative charge, known to be unusual. As the chain length of AG increases, zeta potentials significantly decrease at high pH. ![]() The zeta potentials of bubbles in both pure water and AG solutions at all pH values are negative. The average size of the bubbles generated by sonication is in the range of 300 to 500 nm. The zeta potentials of bubbles with ordinary cationic and ionic surfactants are consistent with others' previous results. ![]() Bubbles in pure water solutions and in aqueous solutions of alkyl polyglycoside (AG) with different alkyl chain lengths and degrees of polymerization in the head group were sonicated with a palladium-coated electrode designed specially by the manufacturer. In a tumultuous atmosphere, Samsung Fire & Marine, the lowest-ranked men’s division, defeated KEPCO and escaped the 8th consecutive victory, while GS Caltex, the second-placed women’s division, defeated Ginseng Corporation and pursued the leading Heungkuk Life Insurance by 5 points.Abstract: A simple and convenient method to measure microelectrophoretic mobilities was proposed to determine the zeta potential of nanobubbles generated by ultrasonication. KEPCO coach Jang Byeong-cheol said that he conducted a full investigation on whether there were any players involved in’Hakpok’, and said that the players are very agitated. ![]() The entire professional volleyball world is tense with the ripples from women’s and men’s. He deeply apologized and said that he would not participate in the game in the future, and the OK club also decided to exclude Song Myung-geun and Shim Gyeong-seop from the game for the rest of the season.Įarlier, through the internet community, an article from the victim that had undergone surgery on a vital area due to an assault by a senior player in the past has been posted, and Song Myung-geun admitted to the fact of being abusive with Shim Gyeong-seop, who was also accused of being the perpetrator. He revealed that he had committed an act that could never be forgiven, which was the perpetrator being beaten and causing irreparable wounds to the victim.Īs he grew older, he became a father and became a junior, and he bowed his head saying he realized how dangerous and bad he had behaved. Yesterday (13th), Song Myung-geun, who admitted to school violence through his team’s OK Financial Group, posted an apology on personal SNS yesterday. Following the sisters Lee Jae-young and Da-Young Da-young, Song Myung-geun, who has been accused of being a perpetrator of school violence, has officially apologized to the victims and fans and decided not to compete in the game for the rest of the season. Professional volleyball is staggering as volleyball players’ past school violence is revealed.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |