Dam-1 Molecular Sieve Forms, Fibers and Films
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DAM-1 MOLECULAR SIEVE FORMS, FIBERS AND FILMS Decio Coutinho, Sudha Madhugiri, Paul Pantano Kenneth J. Balkus Jr* The University of Texas at Dallas, Department of Chemistry and the UTD Nanotech Institute, Richardson, TX 75080-0688 Abstract. The evolution of new molecular sieves and associated applications has generated a greater demand for new ways to manipulate and configure nanoporous materials. The required form of a molecular sieve may involve dramatically different length scales, ranging from shaped particles to fibers and continuous coatings. Various examples of these forms based on Dallas Amorphous Materials one (DAM-1), which was synthesized using a water soluble Vitamin E TPGS as the template, will be illustrated. In addition to potential drug delivery applications for this inorganic/organic composite, the hierarchical forms of DAM-1 may be employed in areas ranging from catalysis to sensors. The morphogenesis of DAM-1 shaped particles and its applications in molecular recognition and optical sensing will be described along with a novel process for spinning DAM-1 molecular sieve fibers. Additionally, our patented method for the fabrication of zeolite membranes, using pulsed laser deposition (PLD) will be discussed. INTRODUCTION The evolution of mesoporous molecular sieves as a field has resulted in many exciting new materials and applications [1-10]. Recently, the synthesis and characterization of a new allsilica mesoporous material, Dallas Amorphous Material No. 1 (DAM-1), using α-tocopheryl polyethylene glycol 1000 succinate (Vitamin-E TPGS) as a directing agent was reported [11,12]. Initially developed for drug delivery applications, DAM-1 is a highly ordered and thermally stable material with a tunable pore diameter in the range of 3-6 nm. A key feature of the DAM-1 synthesis is the ability to manipulate the experimental conditions to control the molecular sieve morphology. The all-silica DAM-1 morphologies prepared so far include hexagons (various lengths), spheres, gyroids, rods, and discoidlike particles. The incorporation of organic functional groups on the surface or imbedded in the walls is an interesting method to modify the properties of the DAM-1 particles. Surface functionalized mesoporous materials are of great interest because of their potential applications in various areas such as catalysis, adsorption, sensing, metal ion extraction, and imprinting for molecular recognition [13,14]. Mesoporous materials are attractive supports for organic functional groups due to their high surface area and uniform pore size distribution. While the silica framework provides thermal and mechanical stability, the surface organic moieties provide control of interfacial and bulk materials properties. The application of these materials depends on the ease at which they can be configured as shaped particles, fibers or films. For example, we have prepared ordered DAM-1 thin films using a pulsed laser deposition (PLD) technique. PLD involves the deposition of a tightly packed layer of molecular sieve fragments ont
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