Extraction mechanisms of charged organic dye molecules into silica-surfactant nanochannels in a porous alumina membrane

Yamaguchi, A.; Watanabe, Jun; Mekawy, Moataz; Fujiwara, Rise; Morita, K.; Yamashita, Tomohisa; Amino, Yosuke; Chen, Yong; Radhakrishnan, Logudurai; Teramae, Norio

doi:10.1016/j.aca.2005.06.029

Cited by 21 publications

(20 citation statements)

References 31 publications

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“…It was reported that extraction of anionic sulforhodamine B (SRB) into the NAM is caused by an anion-exchange between the anionic SRB and counter anions inside the nanochannel. 30 Since the NAM is synthesized from an acidic precursor solution containing HCl, CTAB and TEOS, the nanochannels contain chloride and bromide ions as counter anions of cetyltrimethylammonium (CTA) cation and/or a protonated surface silanol. 25,31 When solute anions are introduced into the nanochannels, adsorption of solute anions occurs via exchange with the anion which is associated with the CTA cation and/or protonated silanol.…”

Section: Solute Dependence Of Permeation Flux In Watermentioning

confidence: 99%

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: Solute Dependence Of Permeation Flux In Watermentioning

confidence: 99%

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

et al. 2006

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“…In addition, a quantitative characterization of chemical processes that occur inside the silica-nanochannels is important to design separation systems based on the hybrid mesoporous membrane. [35][36][37] In particular, essential phenomena to be solved are adsorption or distribution at the silica-nanochannel, viscosity of a solvent confined in the silica-nanochannel, and diffusivity of a solute.…”

Section: Analytical Applicationsmentioning

confidence: 99%

Fabrication and Analytical Applications of Hybrid Mesoporous Membranes

Yamaguchi

Teramae

2008

ANAL. SCI.

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Recently, a hybrid mesoporous membrane composed of surfactant-templated mesoporous silica inside a porous anodic alumina membrane has been developed. Since this membrane allows the use of columnar silica-mesopores (silicananochannels) as nanofluidic channels, separation of molecules can be realized by mass transport through the silicananochannel with molecular dimensions. Here, we review the methods to fabricate the hybrid mesoporous membranes, their structural features, and the analytical applications of hybrid mesoporous membranes.

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“…Hence, the localized internal atmosphere inside the nanochannels could control the diffusion and mass transport mechanisms and thus, can be used for selective separation sciences, sensing and catalysis. Moreover, understanding and prediction of the mechanism of interaction which is responsible for the diffusion, extraction and mass transport within the nanochannels (Yamaguchi et al, 2006 and could help achieving many successful applications of confined mesoporous silica membranes such as; diffusion of biomolecules (Gargiulo et al, 2013), adsorption of organic pollutants (El-Safty et al, 2012), biosensors (Itoh et al, 2014;Hotta et al, 2012;Fan et al, 2014), gas sorption (Chalal et al, 2015) and anion detection at the liquid/liquid interface (Gao et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of mesoporous silica nanochannels inside the channels of anodic alumina membrane

Mekawy

2016

Arabian Journal of Chemistry

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Brij type surfactants (C n EO x ) that have different chemical structures were used to fabricate 3D Mesoporous Silica Nanochannels (MSN) inside the channels of Anodic Alumina Membrane (AAM) under acidic conditions. The fabricated 3D MSN were characterized using TEM-ED, SEM, Small angle XRD, and N 2 isotherm. Results revealed that the synthesis of ordered 3D cubic Im3m mesostructures can be formed with tunable pore diameters varied from 4.0 to 4.9 nm that are partially affected with the length of ethylene oxide (EO) group in the template surfactant. ª 2015 The Author. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Extraction mechanisms of charged organic dye molecules into silica-surfactant nanochannels in a porous alumina membrane

Cited by 21 publications

References 31 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

Fabrication and Analytical Applications of Hybrid Mesoporous Membranes

Fabrication and characterization of mesoporous silica nanochannels inside the channels of anodic alumina membrane

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