SiO2/Cr monolayers and formation of polyethylene films

Wang, Jun; Leeman, Hugo; Schoonheydt, Robert A.

doi:10.1016/j.jcis.2006.03.009

Cited by 12 publications

(6 citation statements)

References 21 publications

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“…Wang et al studied the effect of 1,3,5‐tribenzylhexahydro‐1,3,5‐triazine‐CrCl 3 (TAC‐CrCl 3 ) on Stöber particles with a diameter of 500 nm 71. Solutions containing different amounts of TAC‐CrCl 3 were used for the impregnation of silica particles, which had been previously washed in methanol and water.…”

Section: Deposition Of Complex Multilayersmentioning

confidence: 99%

“…In terms of whether this particular surfactant plays a major role in film formation, this is very questionable. Wang et al observed that the resulting films were quite disordered and contained variable amounts of chromium and thus it would appear that the only conclusion of note is that this surfactant allows film formation, but that it does not particularly facilitate ordered packing of the particles 71…”

Section: Deposition Of Complex Multilayersmentioning

confidence: 99%

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The Langmuir‐Blodgett Approach to Making Colloidal Photonic Crystals from Silica Spheres

Bardosova¹,

Pemble²,

Povey³

et al. 2010

Advanced Materials

168

118

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The area of colloidal photonic crystal research has attracted enormous attention in recent years as a result of the potential of such materials to provide the means of fabricating new or improved photonic devices. As an area where chemistry still predominates over engineering the field is still in its infancy in terms of finding real applications being limited by ease of fabrication, reproducibility and 'quality'- for example the extent to which ordered structures may be prepared over large areas. It is our contention that the Langmuir-Blodgett assembly method when applied to colloidal particles of silica and perhaps other materials, offers a way of overcoming these issues. To this end the assembly of silica and other particles into colloidal photonic crystals using the Langmuir-Blodgett (LB) method is described and some of the numerous papers on this topic, which have been published, are reviewed. It is shown that the layer-by-layer control of photonic crystal growth afforded by the LB method allows for the fabrication of a range of novel, layered photonic crystals that may not be easily assembled using any other approach. Some of the more interesting of these structures, including so-called heterostructured photonic crystals comprising of layers of spheres having different diameters are presented and their optical properties described. Finally, we offer our comments as to future applications of this interesting technology.

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Section: Deposition Of Complex Multilayersmentioning

confidence: 99%

Section: Deposition Of Complex Multilayersmentioning

confidence: 99%

The Langmuir‐Blodgett Approach to Making Colloidal Photonic Crystals from Silica Spheres

Bardosova¹,

Pemble²,

Povey³

et al. 2010

Advanced Materials

168

118

View full text Add to dashboard Cite

show abstract

“…The polymerization of ethylene on the Cr-MS thin film was carried out by UV-light irradiation of the sample in the presence of ethylene gas. Figure 20 shows the IR spectra of the samples observed before and after UV-light irradiation for ethylene polymerization [61,62]. The observation of the two strong bands at 2,854 and 2,916 cm -1 assigned to symmetric and antisymmetric stretching modes of CH 2 groups and a weak peak at 2,955 cm -1 assigned to stretching vibration of terminal CH 3 group with the sample after UV-light irradiation indicate the formation of polyethylene on the surface of the Cr-MS thin film.…”

Section: Transparent Mesoporous Silica Thin Film Withmentioning

confidence: 99%

Applications of Single-site Photocatalysts to the Design of Unique Surface Functional Materials

et al. 2008

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The isolated and tetrahedrally coordinated metal oxide (Ti, V, Cr, Mo and W-oxides) moieties can be included in the silica matrixes of silica-based microporous zeolite and mesoporous silica materials and named as ''single-site photocatalysts''. Under UV-light irradiation these single-site photocatalysts form the charge transfer excited state, i.e., the excited electron-hole pair state which is located quite near to each other in different from the manner observed on semiconducting materials such as TiO 2 , and play a significant role in various photocatalytic reactions. These single-site photocatalysts not only can promote photocatalytic reactions but also can be utilized to synthesis of functional materials. The nano-sized metal catalyst and visible-light sensitive binary oxide photocatalyst can be synthesized on the excited single-site photocatalyst under UV-light irradiation. The transparent mesoporous silica thin film with single-site photocatalyst generates the super-hydrophilic surface. In this review, our recent applications of single-site photocatalysts to synthesis of the surface functional materials have been introduced.Keywords Single-site photocatalyst Á Zeolite Á Mesoporous silica Á Nano-sized metal Á Visible-light sensitive photocatalyst Á Mesoporous thin film Á Surface hydrophilic-hydrophobic property 1 Introduction

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“…The polymerization of ethylene on the Cr-containing mesoporous silica (CMS) thin film was carried out by UV-light irradiation of sample in the presence of ethylene gas. Figure 7 shows the IR spectra of the samples observed before and after UV-light irradiation for ethylene polymerization [10,11,24]. The observation of the two strong bands at 2,854 cm -1 and 2,916 cm -1 assigned to symmetric and antisymmetric stretching modes of CH 2 groups and a weak peak at 2,955 cm -1 assigned to stretching vibration of terminal CH 3 group with the sample after UV-light irradiation indicate the formation the formation of polyethylene on the surface of the Cr-containing mesoporous silica (CMS) thin film.…”

Section: Effect Of Ethylene Polymerization Over Cms Thin Filmsmentioning

confidence: 99%

Photo-induced Surface Property on Transparent Mesoporous Silica Thin Films Containing Single-site Photocatalyst

et al. 2008

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The transparent Ti-containing or Cr-containing mesoporous silica thin films can be prepared on quartz plate using a spin-coating sol-gel method. The spectroscopic characterization has revealed that these thin films contain isolated and tetrahedrally coordinated titanium oxide moieties and chromium oxide moieties in their frameworks, respectively. These mesoporous silica thin films containing metal oxide moieties have demonstrated a strong hydrophilic surface property even before UV-light irradiation and the appearance of the super-hydrophilic property after UV-light irradiation. Especially, the Cr-containing mesoporous silica (CMS) thin film showed the super-hydrophilic property even under visible light irradiation. In the presence of ethylene gas, the polyethylene was successfully formed on the surface of the CMS thin film under UV-light irradiation. After the formation of polyethylene the surface property of the CMS was converted into hydrophobic while keeping its transparency. The isolated and tetrahedrally coordinated titanium oxide moieties and chromium oxide moieties are responsible for these photo-induced surface reactions.

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SiO2/Cr monolayers and formation of polyethylene films

Cited by 12 publications

References 21 publications

The Langmuir‐Blodgett Approach to Making Colloidal Photonic Crystals from Silica Spheres

The Langmuir‐Blodgett Approach to Making Colloidal Photonic Crystals from Silica Spheres

Applications of Single-site Photocatalysts to the Design of Unique Surface Functional Materials

Photo-induced Surface Property on Transparent Mesoporous Silica Thin Films Containing Single-site Photocatalyst

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