Optical Trapping of Titania/Silica Core-Shell Colloidal Particles

Viravathana, Pinsuda; Marr, David W. M.

doi:10.1006/jcis.1999.6603

Cited by 44 publications

(26 citation statements)

References 27 publications

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“…The technique fea ture consists in the possibility of a stepwise formation of the dispersive phase of a sol of a complex oxide composition via selection of the aggregation stability of a system as a whole. Such a technique was applied earlier to obtain mullite [4] and barium titanate [5] using the sol-gel method. In the above works, the syn thesis of salts of double oxide compositions was per formed in organic media using mixed metal alkoxides or salt alcohol solutions.…”

Section: Sample Preparation and Experimental Techniquementioning

confidence: 99%

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Ceramic matrix filled composite prepared by the sol-gel method

Bugaeva

2012

Glass Phys Chem

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GRAIN 1 INTRODUCTONCeramic oxide materials remain fragile even at high temperatures, do not virtually undergo plasticity changes, and are characterized by low resistance to a thermal impact.The efficient ways of increasing the strength and crack resistance of the ceramics include the decrease of its grain size along the grain boundary and rein forcement of the ceramics by crystalline particles hav ing similar grain size and composition but differing in morphology or by fibers of different oxide composi tions and whisker single crystals of refractory com pounds.Use of powders of nanosized particles obtained by the sol-gel method in the process of the formation of an alumina matrix with strengthening particles of lan thanum hexaaluminate enables one to decrease the size of the ceramic crystalline grain and substantially reduce the temperature of synthesis and ceramic com posite sintering.Abstract-A ceramic composite material consisting of a corundum matrix filled with layered microparticles of lanthanum hexaaluminate and strengthened by alumina nanofibers with the fiber surface modified by zir conia nanoparticles has been prepared. All the material components have been synthesized using the sol-gel method. The results of studies of the material microstructure by means of scanning electron microscopy (SEM) indicate the homogeneity of the component distribution in the matrix.

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Section: Sample Preparation and Experimental Techniquementioning

confidence: 99%

“…The technique of synthesis of the initial powders of complex oxide compositions was developed and tested earlier [1,4,5]. The selection of the synthesis tech nique is related to the possibility of producing a highly homogenized sol dispersive phase.…”

Section: Sample Preparation and Experimental Techniquementioning

confidence: 99%

Ceramic matrix filled composite prepared by the sol-gel method

Bugaeva

2012

Glass Phys Chem

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“…where A 132,0 is the non-retarded Hamaker constant (vanishing gap) and A 132,s reflects the static contribution of permanent dipoles (Viravathana and Marr 2000). These parameters can be computed from the dielectric function which is known for several materials (Bergström 1997;Nguyen 2000;cf.…”

Section: ð3:23þmentioning

confidence: 99%

Fundamentals in Colloid Science

Babick

2016

Suspensions of Colloidal Particles and Aggregates

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Preparation and handling of colloidal suspension or even their characterisation is not possible without a basic understanding of the physical effects that prevail on the microscopic level. Some of these effects are directly related to the fineness of the particles because it coincides with a large specific surface area (which corresponds, e.g., to a high adsorption capacity), a considerably curvature of the particle surface (which i. a. promotes dissolution), a high number concentration (i.e. significant osmotic pressure and large collision frequencies), small interparticle distances (i.e. strong interactions between scattered waves), low particle mass (i.e. low weight and inertia), or with the fact that the wavelength of light is larger than particle size (i.e. weak optical scattering). A further effect of the small size of colloidal particles is that their diffusive motion is much faster than for micrometre particles. Moreover, the interactions between colloidal particles are decisive for the macroscopic behaviour of the whole suspension (e.g. with regard to rheology or coagulation). These interactions may be attractive and/or repulsive and depend on the chemical nature and the material properties of the particles. Most of all, they are affected by the interfacial properties which reflect the physico-chemical interaction between the particulate phase, the solvent, and the solutes (e.g. hydrophobicity, adsorption, surface charging).This chapter provides a brief introduction to the fundamentals in colloid science. It addresses the physico-chemical properties of single colloidal particles as well as the processes at the interface and the structure of the interfacial layer. It further examines the non-viscous interactions that occur among colloidal particles. For detailed explanation, the reader is referred to the textbooks of Adamson and Gast

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“…sewage treatment, froth flotation of ore slurries, paper manufacturing). Heteroaggregation may be further used to produce core-shell particles (Viravathana and Marr 2000, Sun et al 2004, Yates et al 2005, Garcia-Perez et al 2006, Cerbelaud et al 2008. It is, therefore, worthwhile to look at the stability of binary suspensions in detail.…”

Section: General Remarks On the Stability Of Binary Suspensionsmentioning

confidence: 99%

Dispersion of Colloidal Suspensions and Their Stability

Babick

2016

Suspensions of Colloidal Particles and Aggregates

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Optical Trapping of Titania/Silica Core-Shell Colloidal Particles

Cited by 44 publications

References 27 publications

Ceramic matrix filled composite prepared by the sol-gel method

Ceramic matrix filled composite prepared by the sol-gel method

Fundamentals in Colloid Science

Dispersion of Colloidal Suspensions and Their Stability

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