Surface chemistry and rheological behaviour of titania pigment suspensions

Morris, Gayle E.; Skinner, William; Self, Peter; Smart, Roger St. C.

doi:10.1016/s0927-7757(98)00631-1

Cited by 90 publications

(60 citation statements)

References 25 publications

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“…After the appropriate surface modification, nanoparticles become hydrophobic, which can decrease their surface tension and lead to better miscibility and compatibility of nanoparticles with the polymer matrix [18]. Organic groups that can be used to attach ligands to the titanium dioxide surface are amine [19], ammonium [20] and different benzene derivatives, mostly catechol and salicylic acid [21][22][23]. Aromatic ligands with two or three adjacent phenolic OH groups (catechol, pyrogallol and gallic acid) can be adsorbed on the surface of TiO 2 by forming chelating or bridging complexes with titanium ions on the surface [24][25].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of the surface modified titanium dioxide/epoxy nanocomposites

Radoman¹,

Terzic²,

Spasojević³

et al. 2015

Savr tehnol

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TiO 2 nanoparticles, obtained by acid catalyzed hydrolysis of titanium isopropoxide, were surface modified by three gallic acid esters with different hydrophobic part length: octyl, decyl and lauryl gallate, and then used to prepare TiO 2 /epoxy nanocomposites. The characterization of the surface modified TiO 2 nanoparticles was performed by FTIR and UV-Vis spectroscopy. The influence of different gallic acid esters and content of modified TiO 2 nanoparticles on the glass transition temperature (Tg), rheological, barrier and mechanical properties of the nanocomposites was investigated by DSC, DMA, water vapor permeability test and König pendulum. The presence of the surface modified TiO 2 nanoparticles in epoxy resin caused the increase of Tg and decrease of the water vapor permeability. However, the length of the nonpolar gallate part showed no effect on Tg of the synthesized nanocomposites, while the increase of the nanofiller content resulted in the increase of Tg. With increasing the hydrophobic part chain length of gallate ligand, the water vapor transmission rate decreased, while the hardness of the nanocomposites did not change.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of the surface modified titanium dioxide/epoxy nanocomposites

Radoman¹,

Terzic²,

Spasojević³

et al. 2015

Savr tehnol

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“…Measurements and correlation of the ζ potential (or surface charge) and rheology have also been presented by others for kaolinite (4), zirconia (5), silica (6), alumina (6,7), and titania (6,8) dispersions. Different measuring techniques and approaches were used, but correlations obtained were similar, with the highest resistance to shear found at or close to the IEP.…”

Section: Introductionmentioning

confidence: 84%

Shear-Induced Aggregation of Anatase Dispersions Investigated by Oscillation and Low Shear Rate Viscometry

Gustafsson

Nordenswan

Rosenholm

2001

Journal of Colloid and Interface Science

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“…Another approach is to apply adsorption during the powder preparation process, where the particles are formed in a reaction mixture that contains a certain dispersant. In that case, the surface of the obtained nanoparticles will be usually coated by chemically adsorbed molecules (Morris et al, 1999;Beek & Janssen, 2002;Wu et al, 2000). Physical adsorption due to electrostatic interactions between the surface of the particle and the dispersant may also be achieved during the preparation process (Kotov et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

“…Physical adsorption due to electrostatic interactions between the surface of the particle and the dispersant may also be achieved during the preparation process (Kotov et al, 1994). Depending on the type of the dispersant, organic (Greenwood & Kendall, 1999;Chibowski & Paszkiewicz, 2001;Beek & Janssen, 2002;Wu et al, 2000;Kotov et al, 1994;Konovalova & Kispert, 1999) or inorganic (Noguchi et al, 2003;Morris et al, 1999) coatings can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Surface Stabilization of Nano-sized Titanium Dioxide: Improving the Colloidal Stability and the Sintering Morphology

Simakov

Tsur

2006

J Nanopart Res

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We have developed a simple surface modification technique to avoid irreversible agglomeration of titanium dioxide nanoparticles. The technique is based on hydrolysis-precipitation procedure, using TiOSO 4 as a precursor and water as a hydrolyser and a preparation medium. Diethylene glycol monomethyl ether is used as a surface modifier. Using a variety of characterization techniques, including XRD, SEM, TEM, TGA, DTA, AES, XPS, ELS and DLS, the resulting powders and the mechanism of surface stabilization were investigated. According to the proposed mechanism, hydroxyl-terminated ether molecules react with the surface of nanoparticles and then chemically adsorbed there. The layer of adsorbed molecules prevents the strong irreversible agglomeration during precipitation from the sol. The obtained anatase powder remains within the nanometric scale under heat-treatment up to 760°C. The powders can be re-dispersed in water by ultrasound treatment, resulting in relatively stable aqueous dispersions. In addition, the morphology of sintered bodies made of these powders is significantly improved as compared to non-stabilized powders, due to less agglomeration in the initial sintering stage.

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Surface chemistry and rheological behaviour of titania pigment suspensions

Cited by 90 publications

References 25 publications

Synthesis and characterization of the surface modified titanium dioxide/epoxy nanocomposites

Synthesis and characterization of the surface modified titanium dioxide/epoxy nanocomposites

Shear-Induced Aggregation of Anatase Dispersions Investigated by Oscillation and Low Shear Rate Viscometry

Surface Stabilization of Nano-sized Titanium Dioxide: Improving the Colloidal Stability and the Sintering Morphology

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