Effect of surfactant on particle morphology for liquid phase deposition of submicron silica

Whitsitt, Elizabeth A.; Barron, Andrew R.

doi:10.1016/j.jcis.2005.01.100

Cited by 16 publications

(15 citation statements)

References 19 publications

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“…In addition, the lack of surfactant in sample 2 which resulted in production of nonspherical shapes confirms the need for a lipid (or lipidlike additive). In agreement with our previous studies, 22 it seems SDS aids sphere formation by possibly making micelles, which act as a template for silicon deposition and ultimately Ca-Si fused complex formation. 24 As a result, it appears the interaction of the silicon and calcium with biolog-ical lipids is a major factor in the development of CBK.…”

Section: Combined Effects Of Surfactant and Siliconsupporting

confidence: 93%

“…The large percentage of carbon in the sample is due to lipids found on the outer layers of the eyes from tears and pores around the eyelid. On the basis of the appearance of fused spheres that are similar to the silica spheres obtained in the presence of surfactants, 22 we can suggest that the spheres in the human samples are a result of the surfactant (i.e., lipid material) acting as a template of silica/silicate growth. We have proposed, therefore, that excess silicon could also be a causative factor in CBK and silicon chelation therapy could play a role in treatment and prevention of the condition.…”

Section: Analysis Of Human Eye Samplesmentioning

confidence: 54%

“…Although the choice of fumed silica as a silicon source was chosen based upon our prior research, 22,25,26 it is important to determine if any form of silicon could initiate the formation of CBK-like material. To test this theory, silicic acid was selected as an alternative silicon source.…”

Section: Effect Of Silicon Concentration and Sourcementioning

confidence: 99%

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Synthesis of calcium–silica composites: A route toward an in vitro model system for calcific band keratopathy precipitates

Doostdar

Manrique

Hamill

et al. 2011

J Biomedical Materials Res

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Calcific band keratopathy (CBK) is a degenerative condition resulting in the deposition of calcium salts in the superficial layers of the cornea and causing significant visual disturbance and pain of the affected eye. Unfortunately, the amount of CBK precipitates recovered from the affected eye is very small therefore; it would be beneficial to prepare a synthetic material mimicking CBK material to further the development of therapeutics. Analyses of biological samples recovered from patients show the presence of silicon in addition to calcium, as well as a distinctive fused spherical morphology. This prompted us to study the reaction of various sources of silicon (fumed silica, silicic acid, and silicone oil) with CaCO(3) under a range of reaction conditions to gain an understanding of the formation of CBK. A silicon source alone was not found to be responsible for the fused spherical morphology, and a third component, a polar surfactant-like molecule such as sodium dodecyl sulfate or tetradecylphosphonic acid, was also required. The effects of silicon:calcium ratio and reaction time have been studied. The reaction of fumed silica with CaCO(3) in presence of sodium dodecyl sulfate results in the formation of spherical shapes resembling the structures and chemical composition observed in the eye samples, while no such structures were observed in the absence of silicon. Samples closely resembling human samples were also formed from the reaction of silicone oil with CaCO(3) in the presence of tetradecylphosphonic acid. Samples were characterized by SEM, XRD, and XPS and Raman spectroscopy.

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Section: Combined Effects Of Surfactant and Siliconsupporting

confidence: 93%

Section: Analysis Of Human Eye Samplesmentioning

confidence: 54%

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Synthesis of calcium–silica composites: A route toward an in vitro model system for calcific band keratopathy precipitates

Doostdar

Manrique

Hamill

et al. 2011

J Biomedical Materials Res

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“…Mesoporous TiO 2 thin films can also be treated with organic dopant such as DNA and methylene blue to TiO 2 film [11,12]. LPD was augmented with the addition surfactant into solution as described in several reports [13][14][15]. The particle size and shape of TiO 2 nanostructures can be controlled during the growth of TiO 2 nanostructures by LPD treated with surfactant technique.…”

Section: Introductionmentioning

confidence: 99%

“…We prepared a TiO 2 nanostructure on ITO substrate using the LPD technique. The surfactants were used to control these properties of TiO 2 nanostructures [15,16]. Three kinds of TiO 2 nanostructure with surfactants-cetyltrimethylammonium bromide (CTAB), polyvinylpyrrolidone (PVP) and hexamethylenetetramine (HMT) -were prepared at the same preparation conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of optical property of surfactant-treated TiO2 nanostructure on the performance of TiO2 photo-electrochemical cell

Rahman

Umar

Roza

et al. 2011

J Solid State Electrochem

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TiO 2 nanostructures have been treated using different kind of surfactant to modify its optical absorption and morphology. TiO 2 nanostructures were prepared via simple method on indium tin oxide (ITO) surface, namely, liquidphase deposition technique (LPD) at 50°C. The TiO 2 nanostructures film with a thickness of about 236 nm was annealed at 400°C for 1 h in the air to enhance the interconnectivity of the particles. The dense and compact TiO 2 nanoparticle with different shape, particle size and surface morphology was used as a photovoltaic material in a photoelectrochemical cell of ITO/TiO 2 /electrolyte/platinum. TiO 2 nanostructure films were treated with three different kinds of surfactants: cetyltrimethylammonium bromide (CTAB), hexamethylenetetramine (HMT) and polyvinylpyrrolidone (PVP). It was found that the film treated with HMT performed best, with a J sc of 57.5 μA/cm 2 . In conclusion, optical absorption, band gap and grain size of TiO 2 nanostructure influenced the performance of the cell.

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Silica coating of vapor grown carbon fibers

2007

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Effect of surfactant on particle morphology for liquid phase deposition of submicron silica

Cited by 16 publications

References 19 publications

Synthesis of calcium–silica composites: A route toward an in vitro model system for calcific band keratopathy precipitates

Synthesis of calcium–silica composites: A route toward an in vitro model system for calcific band keratopathy precipitates

Effect of optical property of surfactant-treated TiO2 nanostructure on the performance of TiO2 photo-electrochemical cell

Silica coating of vapor grown carbon fibers

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