Results 51 to 60 of about 38,002 (168)
Manipulation of Colloids by Nonequilibrium Depletion Force in Temperature Gradient [PDF]
, 2009 The non-equilibrium distribution of colloids in a polymer solution under a temperature gradient is studied experimentally. A slight increase of local temperature by a focused laser drives the colloids towards the hot region, resulting in the trapping of the colloids irrespective of their own thermophoretic properties.
arxiv +1 more source
Cross-interaction drives stratification in drying film of binary colloidal mixtures [PDF]
Phys. Rev. Lett. 118, 108002 (2017), 2017 When a liquid film of colloidal solution consisting of particles of different sizes is dried on a substrate, the colloids often stratify, where smaller colloids are laid upon larger colloids. This phenomenon is counter intuitive because larger colloids which have smaller diffusion constant are expected to remain near the surface during the drying ...
arxiv +1 more source
Solvent mediated interactions between model colloids and interfaces: A microscopic approach [PDF]
J. Chem. Phys. 131, 124704 (2009), 2009 We determine the solvent mediated contribution to the effective potentials for model colloidal or nano- particles dispersed in a binary solvent that exhibits fluid-fluid phase separation. Using a simple density functional theory we calculate the density profiles of both solvent species in the presence of the `colloids', which are treated as external ...
arxiv +1 more source
Effects of colloid polydispersity on the phase behaviour of colloid-polymer mixtures [PDF]
, 2004 We study theoretically the equilibrium phase behaviour of a mixture of polydisperse hard-sphere colloids and monodisperse polymers, modelled using the Asakura-Oosawa model within the free volume approximation of Lekkerkerker et al. We compute full phase diagrams in the plane of colloid and polymer volume fractions, using the moment free energy method ...
arxiv +1 more source
Effect of fluid-colloid interactions on the mobility of a thermophoretic microswimmer in non-ideal fluids [PDF]
Soft Matter 11, 6703-6715 (2015), 2015 Janus colloids propelled by light, e.g., thermophoretic particles, offer promising prospects as artificial microswimmers. However, their swimming behavior and its dependence on fluid properties and fluid-colloid interactions remain poorly understood.
arxiv +1 more source
Metals, 2021 Noble metal NPs are highly attractive candidates because of their unique combination of physical, chemical, mechanical, and structural properties. A lot of developments in this area are still fascinating the materials research community, and are broadly ...
Anurag Gautam +5 more
doaj +1 more source
The Role of Silica Nanoparticles in Promoting the Germination of Tomato (Solanum lycopersicum) Seeds
Nanomaterials, 2023 The addition of nanoparticles has been reported to be an effective strategy for enhancing seed germination, but the underlying mechanisms whereby this occurs are unclear.
Anca Awal Sembada +5 more
doaj +1 more source
Colloids and polymers in random colloidal matrices: demixing under good-solvent conditions [PDF]
, 2012 We consider a simplified coarse-grained model for colloid-polymer mixtures, in which polymers are represented as monoatomic molecules interacting by means of pair potentials. We use it to study polymer-colloid segregation in the presence of a quenched matrix of colloidal hard spheres.
arxiv +1 more source
Efficient simulations of charged colloidal dispersions: A density functional approach [PDF]
Macromolecular Theory and Simulations 14, 278 (2005), 2004 A numerical method is presented for first-principle simulations of charged colloidal dispersions in electrolyte solutions. Utilizing a smoothed profile for colloid-solvent boundaries, efficient mesoscopic simulations are enabled for modeling dispersions of many colloidal particles exhibiting many-body electrostatic interactions.
arxiv +1 more source