Preparation of almost dispersant-free colloidal silica with superb dispersiblility in organic solvents and monomers

Huang, Feng-Hsi; Chang, Cheng-Chi; Oyang, Tai-Yueh; Chen, Ching-Chung; Cheng, Liao‐Ping

doi:10.1007/s11051-011-0342-y

Cited by 16 publications

(12 citation statements)

References 29 publications

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“…The detailed preparation procedures can be found in our previous publications. [17][18][19][20][21] The dyegrafted silica (termed GSiO 2 ) was prepared by adding MR and additional HCl (aq) (pH 1.2) to the $6 nm silica sol. The condensation reaction between Si-OH or between Si-OH and Si-(OC 2 H 5 ), cf.…”

Section: Preparation Of Dye-grafted Silica Nanoparticlesmentioning

confidence: 99%

Thermal analyses of dye Disperse Red 1 grafted onto silica nanoparticles

et al. 2015

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Dye-grafted silica nanoparticles (GSiO 2 ) were synthesized via a dual-step process involving, first, attachment of the organic dye Disperse Red 1 (DR1) to the coupling agent, 3-isocyanatopropyltriethoxysilane, by means of urethane bonds, and then grafting of the silylated-DR1 onto silica nanoparticles ($6 nm) prepared by hydrolysis and condensation of tetraethoxysilane in a sol-gel process. Dye-adsorbed silica nanoparticles (DSiO 2 ) were also prepared for comparison, for which DR1 was bound only physically to silica instead of covalent bonds. The thermal behaviors of the formed GSiO 2 and DSiO 2 were examined by means of differential scanning calorimetry and thermal gravimetric analysis. The results showed that both the particle size and silica content have significant effects on the thermal behaviors of the dye-adsorbed and dye-grafted silica. Moreover, crystalline DR1 lost significantly its crystallinity after being adsorbed on silica, and became virtually amorphous after being grafted onto silica. The formed particles were UV-cured with a multifunctional acrylic monomer to yield color coatings on glass substrates. UVvisible spectra indicated that brightness and color saturation of the coating comprising GSiO 2 could be maintained better than that comprising DSiO 2 after heat treatment at 280°C.

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Section: Preparation Of Dye-grafted Silica Nanoparticlesmentioning

confidence: 99%

Thermal analyses of dye Disperse Red 1 grafted onto silica nanoparticles

et al. 2015

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“…The solid content of each MTSiO 2 sol based on complete hydrolysis and condensation of alkoxy groups was about 26 wt.%. The particle sizes of MTSiO 2 particles were about 5-10 nm [26].…”

Section: Preparation Of Surface-modified Silica Nanoparticlesmentioning

confidence: 97%

“…Colloidal silica nanoparticles were prepared by a modified sol-gel process shown in our previous publications [20,26]. Briefly, TEOS was mixed with IPA at a molar ratio of 1.0 to form a homogeneous solution.…”

Section: Preparation Of Surface-modified Silica Nanoparticlesmentioning

confidence: 99%

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Preparation of polymer/silica hybrid hard coatings with enhanced hydrophobicity on plastic substrates

Chang

Oyang

Hwang

et al. 2012

Journal of Non-Crystalline Solids

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“…The most effective approach is nanoparticle surface functionalization to provide hydrophobic functional groups that can mix homogeneously with hydrophobic liquid media, such as organic solvents, and thus readily integrate with the dissolved polymer chains [25][26][27]. Recent work with hybrid materials highlights the importance of organic dispersants as the anchoring and binding species for the nanoparticles and polymers [26,[28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle and poly(methyl methacrylate) co-dispersion in anisole

Liu

Gervasio

2015

J Mater Sci

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Aqueous nanoparticle dispersions have been widely studied for their important industrial applications, including photocatalyst, coating, and casting. However, much less work has been conducted on nanoparticle dispersions in organic solvents, especially when co-dispersing with dissolved polymers. In this study, we explore TiO 2 / ZnO nanoparticle and poly(methyl methacrylate) (PMMA) co-dispersion in organic solvent anisole. To achieve uniformly dispersed suspensions, nanoparticle surface functionalization with nonanoic acid and 1-pentanol is conducted. Nonanoic acid has higher surface coverage on TiO 2 and the two dispersants show similar surface coverage on ZnO. Heat treatment enhances the dispersant adsorption on the nanoparticle surfaces. For both TiO 2 / PMMA and ZnO/PMMA co-dispersions, higher solids loading leads to higher suspension viscosity. Higher volume fraction of nanoparticles in the nanoparticle plus PMMA solid phase results in lower viscosity, mainly by reducing the entanglement of the dissolved PMMA chains.

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Preparation of almost dispersant-free colloidal silica with superb dispersiblility in organic solvents and monomers

Cited by 16 publications

References 29 publications

Thermal analyses of dye Disperse Red 1 grafted onto silica nanoparticles

Thermal analyses of dye Disperse Red 1 grafted onto silica nanoparticles

Preparation of polymer/silica hybrid hard coatings with enhanced hydrophobicity on plastic substrates

Nanoparticle and poly(methyl methacrylate) co-dispersion in anisole

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