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

By Bhuvnesh Bharti

ISBN-10: 3319077368

ISBN-13: 9783319077369

ISBN-10: 3319077376

ISBN-13: 9783319077376

This thesis offers stories at the interplay of sentimental fabrics like surfactants and proteins with difficult silica nanomaterials. because of its interdisciplinary nature it combines suggestions from the fields of actual chemistry, nanoscience and fabrics technology, yielding to basic 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 inside of tubular nanopores will be tuned on call for by way of the co-adsorption of a floor modifier. The interplay of globular proteins with silica nanoparticles is ruled through electrostatic interactions and will be managed through pH and ionic energy, whereas the bridging of nanoparticles via adsorbed protein molecules results in large-scale hybrid aggregates of protein with the nanoparticles. ideas 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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Additional resources for Adsorption, Aggregation and Structure Formation in Systems of Charged Particles: From Colloidal to Supracolloidal Assembly

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The electrophoretic mobility of a particle can be determined by the application of an electric field across the dispersion. The charged particles suspended in the electrolyte are attracted towards the electrode of opposite charge. Viscous forces acting on the particles tend to oppose this movement. When a steady velocity v, is reached, the electrophoretic mobility is given by μe = v/E, where E is the electric field strength. e. e. small particles in low ionic strength media (Hückel approximation).

1 Surfactant Adsorption The adsorption isotherm of C12E5 on silica nanoparticles was determined by the procedure explained in the previous section. Surface tension was used to determine the equilibrium surfactant concentration (ceq). Surface tension measurements were made by the Du Noüy ring method using a Krüss K11 Tensiometer. The Platinum-Iridium ring of 20 mm diameter was used to examine the pulling force (and hence surface tension) from the liquid-air interface for the determination of surface tension of solution.

The region of linear decay in the surface tension with surfactant concentration < cmc, was used as the reference, and the linear fit to the points was used as the calibration values for determining unknown concentrations of surfactant. 3a. 3b). 3 Generalized example of two different types of adsorption isotherms on silica nanoparticles. a Adsorption isotherm of C12E5 on silica, it presents an S-type curve and can be represented by Gu-Zhu model [14]. b Lysozyme adsorption isotherm at silica surface, it shows a very strong affinity of adsorption on silica surface and can be represented by Langmuir adsorption model For nonionic ethoxylate surfactants, because of the presence of weak nonelectrostatic interactions between the ethoxylate surfactant head groups and silica surface silanol groups, the adsorption isotherms do not show the second plateau region as is the case with ionic surfactants [13] (not shown here).

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Adsorption, Aggregation and Structure Formation in Systems of Charged Particles: From Colloidal to Supracolloidal Assembly by Bhuvnesh Bharti

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