Rheo-optical Behaviors and Stability of a Silica Particle Suspension Coated with Silane Coupling Agents

Dynamics of Hairy-Rod Polymer Solutions in Simple Shear Flow: Aging Effects

“…Actually, based on eqs 1 and 2 and the fact that the experimentally probed angle χ is considered with respect to the polarizer, it can be concluded that when I ω and I 2 ω have opposite signs, the detected birefringence is positive, whereas when they have the same sign, the birefringence is negative. This actually demonstrates the unambiguous detection of the sign of birefringence in the parallel plate geometry by taking advantage of both I ω and I 2 ω signals , (actually I ω should be zero for perfect alignment in the flow direction, but experimentally in the present setup, it is not possible to align the polarizer at exactly 45° with respect to the flow direction during calibration). Therefore, in the case of the aged solutions we have Δ n ‘ < 0 and θ = −90°.…”

Effects of Sodium Salicylate on the Microstructure of an Aqueous Micellar Solution and Its Rheological Responses

“…However, the sign of I 1ω /I dc remained unchanged. The sign change in the rheo-optical intensity I 2ω /I dc was also observed for semidilute silica particle suspensions which exhibited unstable rheological responses (30). In Fig.…”

The rheological behaviors of screen-printing pastes

“…After the dispersant is adsorbed onto the surfaces of the particles, it might provide a steric stabilization or an electrostatic stabilization effect, and thus yielding a colloidally stable suspension (Tseng and Chen, 2003; Kamibayashi et al, 2005; Zurcher and Graule, 2005). As indicated in literature (Lee and Yang, 1998;Jesionowski and Krysztafkiewicz, 2001;Ismail et al, 2001), silane can act as a dispersant. The adsorbed silane will increase the distance between particles, leading to a steric stabilization effect or lowering of the attractive potential energy due to long-range van der Waals forces.…”

“…It has also been reported that the coating of particles with silane-coupling agent not only contributes to a better interfacial adherence but also improves dispersion (Lee and Yang, 1998;Jesionowski and Krysztafkiewicz, 2001;Ismail et al, 2001). The adsorbed organic layer of the silane-coupling agent could render the proper steric stabilization between the neighboring particles (Lee and Yang, 1998). The surface modification of silicas using silane-coupling agent induces a change of the silica surface from hydrophilic to hydrophobic and prevents formation of a secondary structure (Jesionowski and Krysztafkiewicz, 2001;Ismail et al, 2001).…”

“…The coupling agent, a kind of surface treatment agent with bifunctional groups, can be used to enhance the combination effect of organic polymers and inorganic mineral fillers, thereby avoiding cracks and clearance between fillers and substrates (Ray et al, 2003;Sae-Oui et al, 2004;Sun et al, 2006). It has also been reported that the coating of particles with silane-coupling agent not only contributes to a better interfacial adherence but also improves dispersion (Lee and Yang, 1998;Jesionowski and Krysztafkiewicz, 2001;Ismail et al, 2001). The adsorbed organic layer of the silane-coupling agent could render the proper steric stabilization between the neighboring particles (Lee and Yang, 1998).…”