Local Environments of Coumarin Dyes within Mesostructured Silica−Surfactant Nanocomposites

Yamaguchi, A.; Amino, Yosuke; Shima, Kazunari; Suzuki, Shintaro; Yamashita, Tomohisa; Teramae, Norio

doi:10.1021/jp0564086

Cited by 36 publications

(52 citation statements)

References 45 publications

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“…30 mg (1 × 10 -4 mol) per 1 g of NAM. 27 In an extraction experiment, the weight of the NAM is 0.0227 g, and the amount of BS and BDS extracted by the NAM is 1.05 × 10 -6 and 1.15 × 10 -6 mol, respectively. The amounts of extracted In elution experiments, the amount ratio (Rel) is defined as Eq.…”

Section: Solute Dependence Of Permeation Flux In Watermentioning

confidence: 99%

“…Therefore, it is likely that not only anion-exchange but also other interactions are concerned with the extraction of solutes. Other extraction processes such as formation of ionpairs 26,27 may occur at the same time.…”

Section: Solute Dependence Of Permeation Flux In Watermentioning

confidence: 99%

“…In the NAM, there is an ionic interface containing the charged headgroup of the ionic surfactant and their counterions. 27 This ionic interface generates a strong surface field, and polarization of p or π electrons of solutes occurs. In the case of phenol, polarization of electrons of hydroxyl group occurs due to the surface field of the ionic interface, and an inductive dipole is formed.…”

Section: Chromatographic Measurementmentioning

confidence: 99%

“…Solvation is an important factor for interaction between solutes and nanochannels. 27 Protic solvents form a solvation shell in the vicinity of solutes by hydrogen-bonding. [38][39][40] This solvation shell can affect the interactions between solute and the nanochannels.…”

Section: Chromatographic Measurementmentioning

confidence: 99%

“…26 Only small molecules can enter the columnar pore and interact with the interior of the channels. 27 The transport velocity of small molecules in the channels is thought to depend on the interaction with the interior. Therefore, the nanochannels in the NAM can be expected to function as nanometer-order chromatographic columns for separation (Fig.…”

Section: Introductionmentioning

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: Solute Dependence Of Permeation Flux In Watermentioning

confidence: 99%

Section: Solute Dependence Of Permeation Flux In Watermentioning

confidence: 99%

Section: Chromatographic Measurementmentioning

confidence: 99%

Section: Chromatographic Measurementmentioning

confidence: 99%

Section: Introductionmentioning

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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Mesoporous Structures Confined in Anodic Alumina Membranes

2011

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The synthesis of nanoporous membranes based on different concepts and materials is a field of active research. This review focuses on the synthesis strategies, mesophase evolution mechanisms and potential applications of mesoporous materials confined within anodic alumina membranes (AAM). Following a rapid evolution of synthetic techniques, a significant number of different mesoporous materials (e.g., silica, titania, and carbon) with highly regular structures can now be prepared within these membranes. In recent years, efforts have also been made to understand the formation mechanisms of these hierarchical mesophases. The resulting organized nanoporous membranes open up a wide range of potential applications in fields such as templating oriented nanowires and controlled separation and release of molecules. For example, while various synthesis strategies can be used for the preparation of membrane-embedded nanowires, the latter can also be obtained as isolated objects after dissolution of the alumina host matrix. The review also discusses issues such as control of structural defects or integrity of interfaces that should be addressed in future research in order to fully exploit the potential of these hierarchical mesoporous channel structures.

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Light Harvesting by a Periodic Mesoporous Organosilica Chromophore

et al. 2009

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Licht‐Aquädukt: Periodische mesoporöse Organosilicate absorbieren wegen der dichtgepackten organischen Chromophore in den Porenwänden Licht sehr stark. Die durch 125 Biphenylgruppen in den Porenwänden absorbierte Lichtenergie wird mit fast 100 % Quantenausbeute zu einem einzigen Cumarin‐1‐Molekül in den Mesokanälen geleitet, was eine signifikante Erhöhung der Emission des Cumarin‐1‐Farbstoffs zur Folge hat.

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Local Environments of Coumarin Dyes within Mesostructured Silica−Surfactant Nanocomposites

Cited by 36 publications

References 45 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

Mesoporous Structures Confined in Anodic Alumina Membranes

Light Harvesting by a Periodic Mesoporous Organosilica Chromophore

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