Preparation of uniform spherical titania particles coated with polyurea by the aerosol technique

Mayville, Francis C; Partch, Richard; Matijević, Egon

doi:10.1016/0021-9797(87)90332-8

Cited by 39 publications

(9 citation statements)

References 14 publications

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“…The adhesion force can be as weak as van der Waals force or as strong as chemical bonding (Partch & Brown, 1998). When a chemical reaction (Mayville et al, 1987) takes place between the core particle and coating, chemical bonding is the dominant adhesion force. Without chemical bonding, it is the van der Waals force that holds the core and coating together.…”

Section: E Ect Of Materials Property On Particle Coatingmentioning

confidence: 99%

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Formation of organic coating on ultrafine silver particles using a gas-phase process

Zhang

Ranade²,

Gentry

2004

Journal of Aerosol Science

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Section: E Ect Of Materials Property On Particle Coatingmentioning

confidence: 99%

“…Mayville, Partch, and Matijevic (1987) reported the ÿrst successful application using aerosol technique to coat inorganic (TiO 2 , 500 nm in diameter) particles with layers of organic polymer. TiO 2 particles were ÿrst mixed with the vapor of a polymerization initiator (organic diisocyanate).…”

Section: Introductionmentioning

confidence: 99%

Formation of organic coating on ultrafine silver particles using a gas-phase process

Zhang

Ranade²,

Gentry

2004

Journal of Aerosol Science

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“…Like in many other fields of colloid science, special interest exists on such particles when they can be prepared with controlled shape and size (1)(2)(3)(4)(5). In any case, the aim is to take advantage of the properties of both the nucleus (e.g., size, shape, magnetic susceptibility) and the shell (e.g., surface electrical characteristics, adsorption properties) materials.…”

Section: Introductionmentioning

confidence: 99%

Stability of Dispersions of Colloidal Hematite/Yttrium Oxide Core-Shell Particles

Plaza

Quirantes

Delgado

2002

Journal of Colloid and Interface Science

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The colloidal stability of suspensions of hematite/yttria core/shell particles is investigated in this work and compared with that of the pure hematite cores. The different electrical surface characteristics of yttrium and iron oxides, as well as the diameters of both types of spherical particles, dominate the overall process of particle aggregation. The aggregation kinetics of the suspensions was followed by measuring their optical absorbance as a function of time. By previously calculating the extinction cross section of particle doublets, it was demonstrated that for both core and core/shell particles the turbidity of the suspensions should increase on aggregation. Such an increase was in fact found in the systems in spite of the ever-present tendency of the particles to settle under gravity. The authors used the initial slope of the turbidity increment time plots as a measure of the ease of aggregation between particles. Thus, they found that the essential role played by pH on the charge generation on the two oxides and the shift of one pH unit between the isoelectric points of hematite and yttria manifest in two features: (i) the stability decreases on approaching the isoelectric point from either the acid or basic side and (ii) the maximum instability is found for hematite at pH 7 and for hematite/yttria at pH 8, that is, close to the isoelectric points of α-Fe 2 O 3 and Y 2 O 3 , respectively. The role of added electrolyte is simply to yield the suspensions of either type more unstable. Using the surface free energy of the particles, the authors could estimate their Hamaker constants in water. From these and their zeta potentials, the DLVO theory of stability was used to quantitatively explain their results. C 2002 Elsevier Science (USA)

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] These materials can show some special performances, such as optics, electronics, magnetics, and catalysis etc, which are extensively used in the areas of coating, electronics, catalysis, and diagnostics. 16,17 The composite particles with core-shell can be synthesized through several methods: dispersion polymerization, [18][19][20][21][22][23][24][25][26][27] emulsion polymerization, [28][29][30][31][32] miniemulsion polymerization, atom transfer radical polymerization (ATRP), 33 and reversible addition fragmentation chain transfer (RAFT). 34 Dispersion polymerization has been used to synthesize the silica-polystyrene (PS) composite particles.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of SiO₂/PS composite particles via emulsion polymerization

Han

Wang

Zhu

et al. 2011

J of Applied Polymer Sci

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SiO 2 particles prepared by Stö ber method were modified using 1, 3,5,3,5,, and SiO 2 /polystyrene (PS) composite particles with core-shell structure were synthesized adopting mulsion polymerization of PS in a water-ethanol medium. The products were characterized by infrared spectra, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and Zetasizer analyzer. The average diameter of SiO 2 particles prepared by Stö ber method was about 80 nm, the SiO 2 particles were modified using the molar ratio of Vi-D 4 and SiO 2 particles 1 : 10 (the dosage of Vi-D 4 benever too much), and the size of modified silica particles was about 90 nm. The infrared spectra indicated that the Vi-D 4 had bonded to the silanol groups on surface of SiO 2 particles, and XPS indicated the grafting efficiency of Vi-D 4 on surface of SiO 2 particles had reached 90%. The infrared spectra indicated the PS had been incorporated with SiO 2 particles, and TEM indicated the composite particles have obvious core-shell structure. The suitable size of SiO 2 particles should be lower than 200 nm, and the optimum volume ratio of ethanol and water should be 1 : 9 or 1 : 4. A kind of monodisperse SiO 2 /PS composite particles having function of self-assembling was successfully and effectively synthesized.

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Preparation of uniform spherical titania particles coated with polyurea by the aerosol technique

Cited by 39 publications

References 14 publications

Formation of organic coating on ultrafine silver particles using a gas-phase process

Formation of organic coating on ultrafine silver particles using a gas-phase process

Stability of Dispersions of Colloidal Hematite/Yttrium Oxide Core-Shell Particles

Synthesis of SiO₂/PS composite particles via emulsion polymerization

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Preparation of uniform spherical titania particles coated with polyurea by the aerosol technique

Cited by 39 publications

References 14 publications

Formation of organic coating on ultrafine silver particles using a gas-phase process

Formation of organic coating on ultrafine silver particles using a gas-phase process

Stability of Dispersions of Colloidal Hematite/Yttrium Oxide Core-Shell Particles

Synthesis of SiO2/PS composite particles via emulsion polymerization

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Synthesis of SiO₂/PS composite particles via emulsion polymerization