Controlling the chemistry of the micropore volume in pillared clays and micas

Johnson, Jack W.; Brody, J. F.; Soled, S.; Gates, William E.; Robbins, John L.; Marucchi-Soos, E.

doi:10.1016/1381-1169(95)00228-6

Cited by 16 publications

(5 citation statements)

References 15 publications

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“…The formation of pillars by using transition metals hydroxide oxides not only can introduce acidic properties to the material, but can also impart to the PLS other redox catalytic properties which are discussed later. Thus pillaring agents based on Zr, Cr, Fe, Ti, Sn, Tn, Ga, etc., have been prepared by forming polymeric cations of the corresponding ions, − and the acidity of the final material being observed to change significantly with the nature of the hydroxycation (Table ) . As noted previously with Al pillars, most of the acidity of the intercalate pillars, regardless of the cation, is of the Lewis type.…”

Section: Nature Of the Acid Sitesmentioning

confidence: 85%

From Microporous to Mesoporous Molecular Sieve Materials and Their Use in Catalysis

1997

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Section: Nature Of the Acid Sitesmentioning

confidence: 85%

From Microporous to Mesoporous Molecular Sieve Materials and Their Use in Catalysis

1997

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“…Restrictive environments are known to favorably facilitate many chemical and physical processes. The efficiency of biological reactions, such as electron and proton transfer, is attributed, in part, to the highly structured environments in which they take place. , Catalytic and separation processes are enhanced by employing gels, micelles, polymers, zeolites, clays, and biological membranes. − To investigate the effects of structured environments on chemical dynamics, it is advantageous to choose simple models with well-characterized physical and chemical attributes.…”

Section: Introductionmentioning

confidence: 99%

Water Immobilization at Surfactant Interfaces in Reverse Micelles

1998

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The mobility of water in water/Aerosol OT (AOT)/isooctane reverse micelles has been investigated via polar solvation dynamics measurements using ultrafast, time-resolved fluorescence-upconversion spectroscopy. For the smallest reverse micelles studied, w 0 ) 1.1, no solvation dynamics are observed on the time scale of the instrument, suggesting that the water is essentially frozen. As w 0 increases, the mobility of water increases, and the time-correlation functions exhibit multiexponential decays. A subpicosecond component is observed on a time scale similar to that of diffusive bulk-water motion. 1 The other components decay on time scales of a few picoseconds to hundreds of picoseconds. The amplitude of the solvent response increases as w 0 increases, which is attributed to increased mobility of the water inside the reverse micelles. Because the micellar interior is highly ionic, the solvation dynamics of coumarin 343 in a 1 M Na + (Na 2 SO 4 ) solution were also investigated to compare the dynamics of water in the reverse micelles with the dynamics of bulk water in an ionic solution.

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“…Confined water is also frequently encountered in areas of materials processing. Many high surface area catalysts possess small cavities where chemical reactions are accelerated; − quantitative predictions for reaction rates in these systems require some estimate of the solvent's properties. Also, nanoscale reactors defined by inverse micelles have become a popular route to the formation of nanocrystalline materials. − As it becomes more important to affect quantitative control over reaction rates in these media, many fundamental properties of water in these environments will need to be characterized.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Vibrational Modes of Inverse Micelles

et al. 2002

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A large absorption resonance has been observed in the far-infrared spectrum of water confined within inverse micelles of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) in heptane. The amplitude and spectral position of this resonance depend on the size of the water pool. The origin of the THz absorption of these liquid pools is assigned to surface oscillations of the water pool, driven by the interfacial tension of the water−surfactant-oil interface. These data indicate a dramatic restructuring of the density of states of the liquid and are consistent with a theoretical model for the oscillatory modes of liquid droplets. The presence of a large excess in the vibrational density of states of confined water could have far-ranging implications in many biochemical and chemical processes where confined water is present.

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Controlling the chemistry of the micropore volume in pillared clays and micas

Cited by 16 publications

References 15 publications

From Microporous to Mesoporous Molecular Sieve Materials and Their Use in Catalysis

From Microporous to Mesoporous Molecular Sieve Materials and Their Use in Catalysis

Water Immobilization at Surfactant Interfaces in Reverse Micelles

Terahertz Vibrational Modes of Inverse Micelles

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