2005
DOI: 10.1021/jp051401+
|View full text |Cite
|
Sign up to set email alerts
|

Surfactant Removal and Silica Condensation during the Photochemical Calcination of Thin Film Silica Mesophases

Abstract: The evolution of photochemical surfactant removal and silica condensation from organically templated thin film silica nanocomposites with mesoscopic ordering has been probed using a combined application of Fourier transform infrared (FT-IR) spectroscopy and single wavelength ellipsometry. Thin films of silica nanocomposites were prepared by a previously reported evaporation-induced self-assembly process. Specifically, oxidized silicon and gold substrates were withdrawn at 25 mm/min from a subcritical micelle c… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
1
1
1
1

Citation Types

1
31
0

Year Published

2008
2008
2024
2024

Publication Types

Select...
7
2
1

Relationship

0
10

Authors

Journals

citations
Cited by 44 publications
(32 citation statements)
references
References 47 publications
(91 reference statements)
1
31
0
Order By: Relevance
“…In our case, photodegradation may be substantially accelerated through the mediation of oxygen reactive species. 20 Irradiation at wavelengths of 175-210 nm can promote the dissociation of O 2 to produce ozone (O 3 ). After UV absorption, ozone behaves as a precursor for atomic oxygen O, singlet oxygen 1 O 2 as well as hydroxy HO ‱ , and hydroperoxy H 2 O ‱ radicals, which are highly efficient oxidative species.…”
Section: Surfactant-directed Synthesis Of Mesoporous Films Made Singlmentioning
confidence: 99%
“…In our case, photodegradation may be substantially accelerated through the mediation of oxygen reactive species. 20 Irradiation at wavelengths of 175-210 nm can promote the dissociation of O 2 to produce ozone (O 3 ). After UV absorption, ozone behaves as a precursor for atomic oxygen O, singlet oxygen 1 O 2 as well as hydroxy HO ‱ , and hydroperoxy H 2 O ‱ radicals, which are highly efficient oxidative species.…”
Section: Surfactant-directed Synthesis Of Mesoporous Films Made Singlmentioning
confidence: 99%
“…Controlling the time of exposure controlled the surface density of the -CH n and -CF n groups remaining on the surface, thereby, changing the hydrophobicity. In several recent studies, 50,51 the UV photocalcination procedure was found to be able to preserve the silica skeletal while removing the surface surfactants and silane groups in a controlled fashion until all the organic molecules were calcined. The photocalcination reaction mechanism has also been proposed.…”
Section: Experimental Arrangementmentioning
confidence: 99%
“…2b͒. 29 In the next step, Si-H bonds are formed ͑B in Scheme 1͒. The hydrogen abstraction from a CH x fragment by a silicon radical provided the saturation of silicon dangling bonds with hydrogen atoms, with the formation of Si-H bonds ͑Eq.…”
Section: Resultsmentioning
confidence: 99%