Solubilization of organic compounds into as-synthesized spherical mesoporous silica

Miyake, Yoshikazu; Yumoto, Toshimi; Kitamura, Hajime; Sugimoto, Takeo

doi:10.1039/b200074c

Cited by 32 publications

(28 citation statements)

References 16 publications

(17 reference statements)

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“…Solutes can be solubilized into the hydrophobic space consisting of the alkyl chain assembly of cationic surfactants in the as-synthesized mesoporous silica due to the hydrophobic interaction. 29 However, the contribution of hydrophobic interaction is very small in a non-polar mobile phase.…”

Section: Chromatographic Measurementmentioning

confidence: 99%

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Permeation Flux of Organic Molecules through Silica-surfactant Nanochannels in a Porous Alumina Membrane

et al. 2006

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Separation membranes are used in many fields ranging from medical science to industry, and much effort has been devoted to the development of new membranes with high qualities. [1][2][3] Recently, inorganic membranes have attracted much attention because of their superior mechanical strength, thermal stability and resistance to organic solvents. A variety of preparation and application methods of inorganic membranes have been reported. [4][5][6][7][8][9][10][11][12][13][14][15] Zeolites 4-8 and ceramics 9-14 are frequently used as sources of inorganic membranes. Zeolites are porous crystalline materials, which have a high surface area to volume ratio. Membranes made of zeolites are used for catalysts, 5 pervaporation 6,7 and high temperature separation of hydrocarbon isomer vapors. 8 Ceramics such as alumina are hard and heat-resistant materials made with nonmetallic minerals, and ceramic membranes for gas separation 13 and catalysts 14 have been synthesized.Mesoporous silica has also been adopted as a source material in the synthesis of inorganic membranes. 9,15 Mesoporous silica is an ordered material that has three different mesophases: lamellar, cubic and hexagonal. 16,17 In particular, the hexagonal mesophase possesses highly regular arrays of uniform-sized channels whose diameters are in the approximate range of 1 to over 10 nm depending on the surfactants and reaction parameters. Because of its porosity, high surface area, ordered pore arrangement and pore size uniformity, mesoporous silica has been the subject of many theoretical and applied studies. 18 For practical applications, the morphology of mesoporous silica is very important. The film is an ideal morphology for separation membranes, sensor 19,20 and optics. 21,22 Usually, mesoporous silica films are prepared on a flat substrate by dipor spin-coating methods. [23][24][25] However, in the case of hexagonal mesoporous silica, the channels are aligned parallel to the substrate surface, and transport of molecules across the film is not possible. In order to achieve separation, straight channels should be oriented perpendicular to the surface to transport molecules across the film. To solve this problem, instead of hexagonal mesoporous silica, some researchers have used cubic mesoporous silica to synthesize the inorganic membrane. 15,19 Recently, a porous anodic alumina membrane with a perpendicularly oriented silica-surfactant nanochannel assembly membrane (NAM) was synthesized. 26 The porous anodic alumina membrane has a packed array of columnar pores ranging from tens to hundreds of nanometers in diameter, and the channel direction of the columnar pores is perpendicular to the membrane.When a precursor solution containing cetyltrimethylammonium bromide (CTAB) surfactant and tetraethyl orthosilicate (TEOS) as a silica source is introduced into the alumina pores, highly ordered hexagonally arranged silica-surfactant nanochannels with pores of 3.4 nm diameter are assembled inside the alumina pores. The channel direction of mesoporous silica is predomi...

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Section: Chromatographic Measurementmentioning

confidence: 99%

“…The micelles of surfactant form hydrophobic regions in the nanochannels, and organic molecules can be solubilized into the nanochannels. 28,29 Thus, the surfactants in the NAM can facilitate the penetration of organic molecules through the membrane.…”

Section: Introductionmentioning

confidence: 99%

Permeation Flux of Organic Molecules through Silica-surfactant Nanochannels in a Porous Alumina Membrane

et al. 2006

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“…Since then, a large amount of research into synthetic methods for and applications of mesoporous materials has been undertaken in order to control their ordered nano-structure and morphologies [2][3][4][5][6][7][8]. These oxides have high specific surface areas and mesopores with uniform size distribution.…”

Section: Introductionmentioning

confidence: 99%

Preparation and CO2 adsorption properties of aminopropyl-functionalized mesoporous silica microspheres

Araki

Doi

Sano

et al. 2009

Journal of Colloid and Interface Science

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“…Mesoporous silicas have been also used for the adsorption of organic substances. 23,24 Through this article we report the sorption potential of mesoporous lanthanum tungstate materials in removal of heavy metals and also methylmercuric chloride from electroplating effluent streams containing chromium and copper of substantial concentrations.…”

Section: Introductionmentioning

confidence: 99%

Nanoporous Lanthanum Tungstate: A Viable Adsorbent for Heavy Metals and Organic Pollutants

Anbia

Ashrafizadeh

2010

Chin. J. Chem.

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Removal of heavy metal cations from synthetic and industrial electroplating effluents by means of mesoporous lanthanum tungstate sorbents was thoroughly investigated. Three types of such sorbents, namely I-LT, II-LT and III-LT, uncalcined and calcined, were produced and characterized by means of X-ray diffraction, nitrogen sorption isotherms and thermogravimetry analysis (TGA). Results of the experiments for chromium, copper, mercury, iron and lead removal from both synthetic and real industrial wastewater solutions, using these novel sorbents, exhibit promising. Details of this new approach towards wastewater treatment have been discussed and the potentials of technological advancement using mesoporous lanthanum tungstate for environmental purposes addressed. Comparison with the literature shows superiority of the produced adsorbents over reported products.

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Solubilization of organic compounds into as-synthesized spherical mesoporous silica

Cited by 32 publications

References 16 publications

Permeation Flux of Organic Molecules through Silica-surfactant Nanochannels in a Porous Alumina Membrane

Permeation Flux of Organic Molecules through Silica-surfactant Nanochannels in a Porous Alumina Membrane

Preparation and CO2 adsorption properties of aminopropyl-functionalized mesoporous silica microspheres

Nanoporous Lanthanum Tungstate: A Viable Adsorbent for Heavy Metals and Organic Pollutants

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