Download Adsorption, Aggregation and Structure Formation in Systems by Bhuvnesh Bharti PDF

By Bhuvnesh Bharti

This thesis offers reviews at the interplay of sentimental fabrics like surfactants and proteins with demanding silica nanomaterials. because of its interdisciplinary nature it combines options from the fields of actual chemistry, nanoscience and fabrics technological know-how, yielding to primary insights into the structure-directing forces working on the nano-scale. it truly is proven that the morphology of surfactant micellar aggregates adsorbed on the floor of nanoparticles and within tubular nanopores could be tuned on call for via the co-adsorption of a floor modifier. The interplay of globular proteins with silica nanoparticles is ruled by way of electrostatic interactions and will be managed through pH and ionic power, whereas the bridging of nanoparticles by way of adsorbed protein molecules results in large-scale hybrid aggregates of protein with the nanoparticles. thoughts rising from the function of electrostatic interactions within the hetero-aggregation of nanoparticles with protein molecules are used for the co-assembly of charged microbeads into linear clusters and chains of controllable length.

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Extra resources for Adsorption, Aggregation and Structure Formation in Systems of Charged Particles: From Colloidal to Supracolloidal Assembly

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We suppose that the attachment sites for the B particles are at the rim between neighboring A particles. When the electric field is switched off, small B particles can form links between the two oppositely charged A particles, possibly by slipping in a central location between the neighboring A particles. To model the resulting chain length distribution we assume that each contact point in the chain of large particles (A) formed in the primary DEP process represents a binding site for the positively charged small particles (B), which then forms a permanent bond between the two A particles when the field is switched off.

2 Particle Assembly In Chap. 9, we present a novel method devised for harvesting permanent linear chains of oppositely charged latex particles by the initial application of an AC electric field. Here we introduce the basic theory behind the chaining process by dielectrophoresis (DEP) and then give the details of the theory developed, which predicts the distribution of chain lengths of the permanent chains for equally-sized and differently-sized particles of the binary system. 1 Dielectrophoresis Colloidal particles suspended in a medium (aqueous or non-aqueous) can be assembled into ordered structures by the application of direct (DC) [10] or alternating current (AC) fields [11, 12], where the driving force of assembly is the particle polarization, ionic mobility in the medium coupled with fluid flow, and forces resulting from gradients in the field.

4, we report a SANS study of surfactant adsorption on silica nanoparticles, where the SANS profiles are modeled on the basis of previously developed micelle decorated bead model [3]. The model accounts for the structure of the adsorbed surface micelles on spherical silica beads in the silica contrast match scenario. The model assumes that there is a random distribution of the spherical (or ellipsoidal) surface micelles of radius Ra. First step of this model involves the generation of a completely random set of coordinates of the center of each surface micelle lying on the outer surface of a silica nanoparticle of radius Rb.

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