Effects of water content and pH on gel-derived TiO2–SiO2

Yu, Hsuan‐Fu; Wang, Shenq-Min

doi:10.1016/s0022-3093(99)00658-4

Cited by 59 publications

(39 citation statements)

References 15 publications

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“…These results, indicative of more complete hydrolysis and greater density with increasing R w , are in agreement with other workers (28,29). Similar results have been reported by Yu and co-workers (30). They asserted that with the R w over the critical value, M(OH) z monomers interact with each other to form a close packing, resulting in a lower void fraction in the specimens because of more complete hydrolysis.…”

Section: Resultssupporting

confidence: 92%

Preparation of Silica Particles Encapsulating Retinol Using O/W/O Multiple Emulsions

Lee

Moon

et al. 2001

Journal of Colloid and Interface Science

115

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Section: Resultssupporting

confidence: 92%

Preparation of Silica Particles Encapsulating Retinol Using O/W/O Multiple Emulsions

Lee

Moon

et al. 2001

Journal of Colloid and Interface Science

115

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“…Xiaobo [31] reported that the development of Ti─O─Ti chains through alkoxylation is favored when the content of water is low, with low hydrolysis rates and excess titanium alkoxide in the Synthetic Methods for Titanium Dioxide Nanoparticles: A Review http://dx.doi.org/10.5772/intechopen.75425reaction mixture. The amount of water should not be too low otherwise the hydrolysis of the alkoxides with water will be incomplete and condensation occurs between the monomers of (OH) x Ti(OR) 4−x [65]. Other researchers reported that the ratio of water to the alkoxide required for particle formation should be greater than 2.5 as deduced from the equation R= [H 2 O]/[TEOT] > 2.5 [66].…”

Section: Water Contentmentioning

confidence: 99%

“…The monomers obtained then interact with each other to form a three-dimensional network structure. When R is over a critical value, the hydrolysis is more complete and more alkoxides convert to the corresponding metal hydrates, M(OH)z which then react with each other to form particle-like polymers [65]. The formation of Ti(OH) 4 is favored by high hydrolysis rates caused by large amounts of water.…”

Section: Water Contentmentioning

confidence: 99%

“…According to a study by Yu and Wang [65], the molar ratio of H 2 O/alkoxides (Rw) used in the sol-gel process strongly affect the characteristics of the resultant oxides as shown in Figure 5(a). They suggested that the reaction mechanisms for sol-gel conversion depend on Rw used and they came up with three different mechanisms as shown in Figure 5(b).…”

Section: Water Contentmentioning

confidence: 99%

“…All mechanisms could occur at the same time but there would be a dominant one [65]. Case I: When Rw is less than four (Rw < 4), the hydrolysis between alkoxides and water is incomplete hence condensation reaction occurs between the monomers.…”

Section: Water Contentmentioning

confidence: 99%

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Titanium dioxide (TiO 2 ) semiconductor nanoparticles are one kind of important and promising photocatalysts in photocatalysis because of their unique optical and electronic properties. Their properties, which are determined by the preparation method, are very crucial in photocatalysis. In this chapter, an overview was carried out on the different methods that are used or have been used to prepare titanium dioxide nanoparticles. There are various methods that can be used to synthesize TiO 2 and the most commonly used methods include sol-gel process, chemical vapor deposition (CVD) and hydrothermal method among others. This review will focus on selected preparation methods of titanium dioxide photocatalyst.

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Amorphous Porous Mixed Oxides: A New and Highly Versatile Class of Materials

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2012

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Porous solids are a rapidly developing class of materials with an ever-increasing range of applications. Among these materials, amorphous porous mixed oxides possess the extraordinary properties of fine tuning the chemical composition, microstructure, porosity and surface properties. The tailor made composition of the mixed oxides can be fabricated from the availability of variety of precursor, additives and modifiers. Besides, their performance can be found close to that of crystalline phase. These amorphous mixed oxides can easily be synthesized using acid / base catalyzed one-pot sol-gel procedure. Sol-gel processes allow for a relatively facile tailoring of the morphology of mixed oxides to the desired application in the field of nanotechnology. Pore volume, porosity, specific surface area, and surface acidity are typical parameters that can be tailored. This chapter deals with the preparation methodology, characterization techniques, and application of amorphous porous mixed oxides.

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Effects of water content and pH on gel-derived TiO2–SiO2

Cited by 59 publications

References 15 publications

Preparation of Silica Particles Encapsulating Retinol Using O/W/O Multiple Emulsions

Preparation of Silica Particles Encapsulating Retinol Using O/W/O Multiple Emulsions

Synthetic Methods for Titanium Dioxide Nanoparticles: A Review

Amorphous Porous Mixed Oxides: A New and Highly Versatile Class of Materials

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