Zeolite Coatings on Three-Dimensional Objects via Laser Ablation

Balkus, Kenneth J.; Scott, Ashley S.

doi:10.1021/cm9806174

Cited by 27 publications

(8 citation statements)

References 14 publications

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“…However, adsorption and desorption of molecules is difficult, because, in general, the ends of the channels are closed. 11 Zeolites are well-known as microporous materials, and zeolite films with a one-dimensional channel structure have been synthesized, [19][20][21][22] but the direction of these channels was perpendicular to the film surface, not parallel to the surface. Recently, LB films of imogolite (a clay mineral with a hollow tube structure) were reported.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Langmuir–Blodgett films of aligned sepiolite fibers and orientation of methylene blue molecules adsorbed on the film

Umemura

Shinohara

Schoonheydt

2009

Phys. Chem. Chem. Phys.

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Sepiolite is a clay mineral with a fibrous morphology; the fibers possess rectangular channels along the fiber direction, and have cation-exchange ability. Amphiphilic octadecylammonium cations (ODAH(+)) spread at an interface between the air and a dispersion of sepiolite fibers have hybridized with the fibers to form a floating monolayer. Surface pressure-molecular area isotherms did not indicate clear collapse points of the hybrid monolayers. Observation of the hybrid films on glass plates by atomic force microscopy revealed that the sepiolite fibers preferred to be aligned perpendicularly to the compression direction, and that some fibers overlapped upon compression or even before compression. Out-of-plane and in-plane X-ray diffraction patterns of the hybrid film showed that the fibers were not only aligned by the compression but oriented around the fiber direction. Electronic spectra of methylene blue cations (MB(+)) adsorbed on the hybrid film indicated the presence of monomers and dimers of MB(+). The absorption intensity due to the monomer was dependent on the polarization direction of the incident beam; interestingly, the monomers were spontaneously oriented along the sepiolite fiber direction but the dimers were not oriented. By comparison with the results of rhodamine 6G adsorbed on the film, the monomers of MB(+) would probably be present in the channels of sepiolite fibers, while the dimers would be adsorbed on the external surface of the fibers.

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Section: Introductionmentioning

confidence: 99%

Preparation of Langmuir–Blodgett films of aligned sepiolite fibers and orientation of methylene blue molecules adsorbed on the film

Umemura

Shinohara

Schoonheydt

2009

Phys. Chem. Chem. Phys.

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“…The so-called secondary growth method based on coating a porous support surface with zeolite seeds prior to hydrothermal synthesis is an effective approach to increasing the quality and reproducibility of supported zeolite membranes. Seeded hydrothermal synthesis provides a better control of the membrane formation process by decoupling the nucleation and growth steps [23][24][25][26]. Furthermore, by decreasing sufficiently the concentration of crystal precursors, nucleation of new moieties in the bulk of the solution is discouraged, while growth of the crystals on the support surfaces can still proceed.…”

Section: Introductionmentioning

confidence: 99%

“…The most widely used seeding methods include dip-coating [23], laser ablation [26] and rubbing [8,[12][13][14]. The last two methods are highly efficient for seeding, although their use in tubular supports is restricted almost exclusively to the cases where membranes are grown on the support outer surface.…”

Section: Introductionmentioning

confidence: 99%

Preparation of inner-side tubular zeolite NaA membranes in a semi-continuous synthesis system

Pera‐Titus

Mallada

Llorens

et al. 2006

Journal of Membrane Science

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“…Coating performance is determined by a range of factors, including the rheology of the coating materials, substrate surface properties, curing reaction kinetics (if introduced), and coating technique. − For solid particles, common coating methods include dip coating, pulse laser deposition (PLD), , and spray coating with fluidized beds. ,,, Chemical cross-linking or curing is often induced during or after the coating process for enhanced coating-layer properties. Although curing can be triggered by multiple means, − heat-induced or thermal curing remains the most widely used.…”

Section: Introductionmentioning

confidence: 99%

Polymer Coating over Solid Particles with In Situ Thermal Curing

Zhang

Faucher

et al. 2016

Ind. Eng. Chem. Res.

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Solid particles coated by cross-linked polymer layers find applications in many areas, including hydraulic fracturing operations. In this study, a hot-melt resin coating process for solid particles is developed and optimized for hydraulic fracturing applications. Phenolic resin is used to coat the particles above its melting point and is subsequently cured in situ by hexamethylenetetramine (HMTA). The coating quality is then characterized by the surface morphology, acid solubility, and crush resistance of the resin-coated particles. The effects of various operating parameters on the coating performance are systematically studied. Among them, temperature is shown to play an especially important role. The coating process involves intricate coupling between resin rheology, HMTA mass transfer, and curing kinetics, all of which are profoundly influenced by temperature. Different constant temperature levels as well as controlled temperature ramps are investigated, and the results show a complex dependence. Higher temperature leads to stronger coating layers with better barrier properties, whereas lower temperature is preferable for better surface morphology. These two trends can be partially reconciled with ramping temperature profiles; the improvement is, however, eventually limited by the rate of heat transfer. This study not only provides insight into the physical and chemical processes underlying the resin coating operation, it also demonstrates a generalizable strategy suitable for various particle coating processes.

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Zeolite Coatings on Three-Dimensional Objects via Laser Ablation

Cited by 27 publications

References 14 publications

Preparation of Langmuir–Blodgett films of aligned sepiolite fibers and orientation of methylene blue molecules adsorbed on the film

Preparation of Langmuir–Blodgett films of aligned sepiolite fibers and orientation of methylene blue molecules adsorbed on the film

Preparation of inner-side tubular zeolite NaA membranes in a semi-continuous synthesis system

Polymer Coating over Solid Particles with In Situ Thermal Curing

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