Adhesion between Silica Particle and Mica Surfaces in Water and Electrolyte Solutions

Vakarelski, Ivan U.; Ishimura, Kazushige; Higashitani, Ko

doi:10.1006/jcis.2000.6884

Cited by 99 publications

(80 citation statements)

References 26 publications

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“…Substituting r into our expressions for 0 and G 0 , we obtain G 0 t 0:5 , in reasonable agreement with our measurement, G 0 t 0:4 . The time dependence requires U 33k B T; this is comparable to known hydration enthalpies [21], supporting our hypothesis.…”

Section: Prl 95 048302 (2005) P H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 85%

“…Instead, we hypothesize that the kinetics of bond formation is reaction limited, as formation of Si-O-Si bonds requires hydration of cations at the surface of the particles. Support for this comes from atomic force microscopy studies [21], which attribute a short-ranged repulsion to the presence of a counterion layer. We can use the measurements of G 0 t to estimate the bond activation energy, and the evolution of the contact area.…”

Section: Prl 95 048302 (2005) P H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 99%

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Time-Dependent Strength of Colloidal Gels

et al. 2005

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Colloidal silica gels are shown to stiffen with time, as demonstrated by both dynamic light scattering and bulk rheological measurements. Their elastic moduli increase as a power law with time, independent of particle volume fraction; however, static light scattering indicates that there are no large-scale structural changes. We propose that increases in local elasticity arising from bonding between neighboring colloidal particles can account for the strengthening of the network, while preserving network structure. DOI: 10.1103/PhysRevLett.95.048302 PACS numbers: 82.70.Gg, 61.43.Hv, 62.20.Dc, 82.70.Dd Gels are dilute connected networks which are capable of supporting applied stresses; they are commonly used to control the rheological properties of complex materials. Such networks can be formed by the aggregation of colloidal particles, which occurs when an attractive interaction is induced between them. Network elasticity is highly sensitive to the connectivity and arrangement of particles in the constituent aggregates. Colloidal gels are out-ofequilibrium systems; as a result, these networks frequently display time-dependent properties, due to network restructuring. This kind of aging is modeled for generic nonequilibrium systems as an evolution toward lower energy states, as the system explores a complex energy landscape [1,2]. However, network elasticity is also dependent on the interactions between particles; therefore, time-dependent interactions may also lead to changes in network properties. For colloidal gels, it is generally assumed that interparticle attractions, such as those described by Derujaguin-LandauVerwey-Overbeek [3,4] or Asakura-Oosawa potentials [5], determine local bond elasticity, thus, in principle, limiting their strength [6,7]. In the absence of a steric stabilization layer, particle interactions can also arise from physical bonds, as a result of covalent bonding or polymer entanglements. Within this framework, time evolution of network properties can be linked to the interparticle potential, for example, through the transport of particles from secondary to primary minima [8]. Aging can also be a consequence of time-dependent physical bonding; for example, the sintering of aggregated polystyrene particles is thought to drive local shrinkage that deforms the network [9]. The strength of the local interparticle bonds will have a direct impact on the network elasticity; however, these critical effects have never been explored.In this Letter, we present measurements of the elasticity of colloidal silica gels. Surprisingly, we find that, upon gelation, their storage moduli G 0 increase as a power law in time, G 0 t 0:4 , independent of initial volume fraction . Moreover, the time evolution of the network persists long after gelation occurs, for the duration of the measurement. As a consequence, their elasticity maintains the same volume fraction dependence, G 0 3:6 , independent of time. We postulate that the stiffening of the network is a result of chemical reactions at the junctions be...

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Section: Prl 95 048302 (2005) P H Y S I C a L R E V I E W L E T T E R Ssupporting

confidence: 85%

Section: Prl 95 048302 (2005) P H Y S I C a L R E V I E W L E T T E R Smentioning

confidence: 99%

Time-Dependent Strength of Colloidal Gels

et al. 2005

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“…[319], had already demonstrated the capability of AFM in probing van der Waals force with high distance and force resolution. Further measurements and characterizations of van der Waals forces with different tip-sample systems can be found for different systems, such as silicon nitride/silicon nitride in diiodomethane [320], Teflon AF/silica or alumina [321], silica/mica in water [322], silicon nitride/various samples in water, ethanol, ethylene glycol, and formamide [323], and poly(tetrafluoroethylene)/silica or alumina [324]. An overview over Hamaker constants is given in Table 4.…”

Section: Determination Of Hamaker Constants Adhesion and Surface Enementioning

confidence: 99%

“…In fact, short range monotonically repulsive forces observed between inorganic surfaces are probably not only due to structured water layers propagated away from the surfaces, but to the osmotic effect of hydrated ions which are electrostatically trapped between two approaching surfaces [481]. For example the role of adsorbed ions on silica and mica was studied extensively by Vakarelski et al [279,322].…”

Section: Hydration Repulsionmentioning

confidence: 99%

Force measurements with the atomic force microscope: Technique, interpretation and applications

Butt

Cappella

Kappl

2005

Surface Science Reports

3,246

2,949

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“…Recent measurements of adhesive forces between a plate and a particle with an atomic force microscope (AFM) indicate that the strength of adhesive force depends greatly on the microstructure of the adsorbed layer, even in such a simple solution like electrolyte solution. The characteristics are summarized as follows, and the details are given elsewhere [49,50] Fig. 13.…”

Section: Adhesive Force Between Particles In Solutionsmentioning

confidence: 99%