Tong Wang, Tong Wei, Xiaobo Lin, John M Torkelson
#SONG MYUNG GEUN SPIKE KING FREE#
N00.00008: Relating fractional free volume to physical aging: A study of tunability and molecular weight dependence of physical aging behavior of polystyrene and poly(methyl methacrylate) films Shin Nakagawa, Yuta Fujisawa, Takuzo Aida, Suguru Kitani, Hitoshi Kawaji, Yohei Yamamoto, Tatsuya Mori N00.00007: Boson peak of self-healable polymers: terahertz time-domain spectroscopy and low-temperature specific heat measurement N00.00006: Identification of conformer defects associated with tacticity in polymers using Terahertz spectroscopy
N00.00005: BoltzmaNN: Predicting effective pair potentials and equations of state using neural networks N00.00004: Computational reverse-engineering analysis for scattering experiments (CREASE) on thermoresponsive assembly of methylcellulose in aqueous solutions
Michael J Boyle, Russell J Composto, Yale E. N00.00003: Improving Label-Free Nanoparticle Detection Accuracy in Interferometric Scattering Microscopy (iSCAT) Images Using a Mask R-CNN Machine Learning Framework N00.00002: The elasticity of single flexible polymers using AFM based nanorheology Session Index Session N00: Poster Session II (11am- 2pm CST) Even though these alcohols did not have any electrical charge, they had a stron.Please enable JavaScript in your browser. The addition of a small amount of propanol and butanol provided significant information for considering the mechanism of the gas−water interface charge. OH- and H+ are crucial factors for the charging mechanism of the gas−water interface, while other anions and cations have secondary effects on the ζ potential, because counterions are attracted by the interface charge. The potential was positive under strong acidic conditions, and the inorganic electrolytes decrease the potential by increasing the amount of counterions within the slipping plane. 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. Abstract: A simple and convenient method to measure microelectrophoretic mobilities was proposed to determine the zeta potential of nanobubbles generated by ultrasonication.
0 kommentar(er)
