Mesochemistry

Ozin, Geoffrey A.; Chomski, Emmanuel; Khushalani, Deepa; MacLachlan, Mark J.

doi:10.1016/s1359-0294(98)80012-5

Cited by 68 publications

(45 citation statements)

References 82 publications

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“…A considerable advance in this direction was the finding by Zimmermann et al [2] that uniaxial orientation of a mesomorphic derivative of triphenylene could be achieved by spin-coating onto a friction-deposited layer of poly(tetrafluoroethylene) (PTFE). More recently, van de Craats and co-workers [3,4] have…”

Section: Methodsmentioning

confidence: 99%

Aerosol‐Assisted Formation of Mesostructured Thin Films

McCaughey

Wang

et al. 2003

Advanced Materials

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Surfactant-templated mesoporous materials have attracted much attention due to their unique structures and potential applications.[1±3] Synthesis of these materials involves the formation of surfactant±inorganic nanocomposites via co-assembly of surfactant and inorganic species and subsequent surfactant removal to create mesoporous materials with controlled pore structures (e.g., hexagonal or cubic arrangement of pores or lamellar nanostructures [1,3±5] ) and with various macroscopic forms (e.g., powders, [1±3,6] particles, [7±10] thin films, [8,11±16] and fibers [17,18] ). Mesoporous thin films are of particular interest because of their potential applications as sensors, membranes, and low dielectric constant films. [13,19,20] Synthesis methods include solution deposition [12,21] and solvent evaporation-induced self-assembly (EISA). [8,13,15,16,22] In the solution deposition method, thin films spontaneously nucleate and grow from acidic aqueous silicate solutions containing high concentrations of surfactant. This slow deposition process (time scale of hours to days) usually results in hexagonally ordered granular thin films with pore channels oriented parallel to the substrate surface. The EISA route deposits thin films using a rapid dipor spin-coating process (time scale of seconds), during which solvent evaporation enriches the concentration of silicate and surfactant, inducing their co-assembly into mesostructured, defect-free surfactant±silicate thin films. [13,23] This research describes a novel approach that combines aerosol deposition [24±26] and EISA to fabricate mesostructured thin films. As shown in Figure 1, this method starts with an acidic precursor solution containing a silica source and surfactant. Solvent evaporation from the aerosol droplets enriches them in silicate and surfactant and induces their co-assembly into semi-solid mesostructured particles.[8] These semi-solid particles then further coalescence on the substrate resulting in a continuous mesostructured thin film with no evidence of its original particle morphology. Compared with the dip-coating or spin-coating processes, this method can rapidly deposit mesostructured thin films with easily controlled mesostructures on large-scale planar and non-planar substrates. Figure 1 shows the scheme of the aerosol deposition apparatus. The atomizer (TSI Model # 3076) was operated under laminar flow conditions using 2.6 L min ±1 of N 2 as the carrier/ atomization gas. The heating zone was maintained at 150 C or less. The residence times for the entrained aerosol particles in the drying and heating zones are approximately 3 s each.

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Section: Methodsmentioning

confidence: 99%

Aerosol‐Assisted Formation of Mesostructured Thin Films

McCaughey

Wang

et al. 2003

Advanced Materials

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“…[3] This material is formed using the precursor (EtO) 4 Si. [3] This material is formed using the precursor (EtO) 4 Si.…”

Section: Organization Of Bridging Organics In Periodic Mesoporous Orgmentioning

confidence: 99%

Organization of Bridging Organics in Periodic Mesoporous Organosilicas (PMOs)—Polarization Micro‐Raman Spectroscopy

Dag

Ozin

2001

Advanced Materials

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Polarization micro‐Raman spectroscopy (PMRS)shows that the spatial organization of bridge‐bonded ethane, ethene, thiophene, and benzene groups housed “inside” the channel walls of oriented periodic mesoporous organosilica film (OPMOF) is random, endowing the structure with “crystalline porosity” at the mesoscale and a “glassy” organosilica framework at the microscale. The Figure shows an image of an oriented mesoporous thiophene–silica film.

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“…[17] One important way of modifying the physical and chemical properties of mesoporous silicates has been the incorporation of organic components, either on the silicate surface, as part of the silicate walls, or trapped within the channels. [18,19] Organic modification of the silicates permits precise control over the surface properties and pore sizes of the mesoporous sieves for specific applications, while at the same time stabilizing the materials towards hydrolysis. Bulk properties can also be affected by mixing inorganic and organic moieties in the mesostructures.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Inorganic-Organic Mesoporous Silicates—Nanoscopic Reactors Coming of Age

2000

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This review describes methods of preparing hybrid inorganic–organic mesoporous silicates with uniform channel structures, as well as some of their applications. Both reactive and passive organic groups can be incorporated in the porous solids by grafting methods or by co‐condensation under surfactant control. Functional groups have been placed selectively on the internal or external pore surfaces or even within the walls of the mesoporous solids. Organic functionalization of these solids permits tuning of the surface properties (hydrophilicity, hydrophobicity, binding to guest molecules), alteration of the surface reactivity, protection of the surface from attack, and modification of the bulk properties (e.g., mechanical or optical properties) of the material. Recent applications of hybrid mesoporous silicates are highlighted, including catalysis, sorption of metals, anions, and organics, reactors for polymerization, fixation of biologically active species, and optical applications.

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Mesochemistry

Cited by 68 publications

References 82 publications

Aerosol‐Assisted Formation of Mesostructured Thin Films

Aerosol‐Assisted Formation of Mesostructured Thin Films

Organization of Bridging Organics in Periodic Mesoporous Organosilicas (PMOs)—Polarization Micro‐Raman Spectroscopy

Hybrid Inorganic-Organic Mesoporous Silicates—Nanoscopic Reactors Coming of Age

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