Self-Supporting Porous Zeolite Membranes with Sponge-like Architecture and Zeolitic Microtubes

Wang, Yajun; Tang, Yi; Dong, Angang; Wang, Xingdong; Ren, Nan; Shan, Wei; Gao, Ziwen

doi:10.1002/1521-4095(20020705)14:13/14<994::aid-adma994>3.0.co;2-9

Cited by 37 publications

(31 citation statements)

References 34 publications

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“…Nanoparticles of a negatively charged silicalite-1 nanocrystal have been used to infiltrate a polyelectrolyte (poly(diallyldimethylammonium chloride)) modified cellulose acetate membrane, resulting in a film containing a hierarchical pore system. [15] In this paper, cellulose acetate membranes have been used to demonstrate that porous metal oxide films can be formed using the preformed nanoparticle templating technique. The type of metal oxide nanoparticle studied has been extended to include tin, cerium, iron, and aluminum oxides.…”

Section: Introductionmentioning

confidence: 99%

Inorganic Macroporous Films from Preformed Nanoparticles and Membrane Templates: Synthesis and Investigation of Photocatalytic and Photoelectrochemical Properties

Shchukin¹,

Caruso²

2003

Adv Funct Materials

106

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Colloidal dispersions of titania, zirconia, tin oxide, indium oxide, and ceria have been successfully used to impregnate membrane templates and form the respective metal oxide (MO) porous films. The use of alumina and iron oxide sols in the same procedure, however, resulted in compact structures. By mixing different nanoparticle solutions before impregnation, final inorganic films containing two metal oxides, of variable metal oxide ratios, were obtained. The porous inorganic materials were analyzed in terms of surface area, pore size, film thickness, and crystallinity. The mechanism of nanoparticle infiltration and particle adsorption to the template walls is proposed based on the stability of the inorganic film and a study of the influence of either the sol concentration or washing times on the amount of inorganic substance incorporated in the hybrid material. The photocatalytic decomposition of an organic pollutant, 2‐chlorophenol, was demonstrated for the porous titania material along with the structures containing mixtures of titania with zirconia, indium oxide, and tin oxide. A ratio of 9:1 TiO2/MO gave the highest photocatalytic activity, which was higher than the activity of Degussa P25 for the TiO2/In2O3 and TiO2/SnO2 systems under the same conditions. The titania films have also been attached to substrates—glass or indium tin oxide (ITO) surfaces—and the photoelectrochemical properties of the porous film attained. A comparison with a spin‐coated titania film (prepared from the same colloidal dispersion) showed that the structured porous inorganic film has two times the photoelectrochemical efficiency as the spin‐coated film.

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Section: Introductionmentioning

confidence: 99%

Inorganic Macroporous Films from Preformed Nanoparticles and Membrane Templates: Synthesis and Investigation of Photocatalytic and Photoelectrochemical Properties

Shchukin¹,

Caruso²

2003

Adv Funct Materials

106

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“…Recently, the LbL technique has been extended from conventional nonporous substrates to macroporous substrates, such as 3DOM materials [58,59], macroporous membranes [60][61][62][63], and porous calcium carbonate microparticles [64,65], to prepare porous PE-based materials. LbL-assembly of polyelectrolytes can also be performed on the surface of MS particles preloaded with enzymes [66,67] or small molecule drugs [68], and, under appropriate solution conditions, within the pores of MS particles to generate polymer-based nanoporous spheres following removal of the silica template [69].…”

Section: Lbl Assemblymentioning

confidence: 99%

“…They also have much larger inner surface areas compared with hollow spheres of the same diameter, rendering them superior in terms of loading capacity for guest molecules [115,116]. Several approaches have been developed to prepare nanotubes of various compositions and morphologies using nanorods [117], nanofibers [118], and porous membranes as templates [60][61][62][63]. The LbL assembly technique has proven to be an efficient method to control the thickness, composition, and functionalization of nanotubes.…”

Section: Lbl Assembly On Tubular Substratesmentioning

confidence: 99%

“…This involves the LbL assembly of polyelectrolytes and nanoparticles in an organic filter membrane such as cellulose acetate and polycarbonate. Zeolitic tubes [63] and hybrid nanotubes of metal [60], semiconductor nanoparticles [60], and polymer [60] are prepared by alternately depositing PEs and/or nanoparticles in the filter membrane, then removing the organic membrane with dichloromethane or by calcination.…”

Section: Lbl Assembly On Tubular Substratesmentioning

confidence: 99%

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Bioinspired Porous Hybrid Materials via Layer‐by‐Layer Assembly

Wang

Caruso

2007

Bio‐inorganic Hybrid Nanomaterials

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Hybrid porous materials are attracting considerable interest for applications such as biocatalysis, biosensing, and bioseparation, because they combine benefits originating from their unique pore structure and intrinsic composite properties. These materials are generally composed of a porous inorganic framework, which acts as a robust support for functionalization with organic species or biological molecules. The unique pore channels make it possible to use the functional sites situated in the inorganic framework. This chapter discusses recent trends in using porous inorganic materials with pore sizes from several nanometers to micrometers as substrates for biologically oriented applications, emphasizing the layer-by-layer (LbL) method. The flexibility of the LbL strategy will be demonstrated by a number of examples, where various species are deposited in porous substrates with different morphologies and pore structures. We will focus on porous materials in which new biological properties have been engineered, and highlight our recent investigations into the bioapplication of mesoporous silica particles. Additionally, we will briefly discuss the potential applications of the novel bio-hybrids with different pore structures. Porous MaterialsMaterials with uniform pore structures offer a wide range of applications, including catalysis, adsorption, and separation. These materials have the benefit of both specific pore systems and intrinsic chemical properties [1][2][3]. The pores in the materials are able to host guest species and provide a pathway for molecule transportation. The skeletal pore walls provide an active and/or affinity surface to associate with guest molecules. According to the International Union of Pure and Applied Chemistry (IUPAC), porous materials can be classified into three main categories based on the diameters of their pores, that is, microporous, mesoporous, and macroporous j209 Bio-inorganic Hybrid Nanomaterials. Edited

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“…[12] Also, macroporous silicates with zeolite (silicalite-1) frameworks have been prepared by hydrothermal synthesis by using arrays of monodisperse polystyrene spheres as templates [6] or by alternating layers of silicalite-1 nanoparticles and oppositely charged polyonic macromolecules which are sequentially adsorbed onto micrometric latex spheres and then assembled into ordered macroporous monoliths, [13] micro/meso/macroporous organized silicalite-1 monoliths and mesoporous films by starch gel templating, [4] and self-supporting porous zeolite membranes with spongelike architectures and zeolitic microtubes from cellulose acetate filter membrane. [14] Inexpensive and environmentally benign biological species are excellent for serving as macrotemplates for the synthesis of hierarchical structures, [15] while the cellular tissue of wood [16] and pinewood char [17] have been used to fabricate ordered macro and micropore structures. Finally, hierarchical zeolites have been produced growing zeolite crystals around carbon particles, [3] while the walls of mesoporous silicates have been recrystallized to zeolites.…”

Section: Introductionmentioning

confidence: 99%

Spheres of Microporous Titanosilicate Umbite with Hierarchical Pore Systems

Sebastián

Dı́az

Téllez

et al. 2008

Adv Funct Materials

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Micrometric polycrystalline spheres of up to 1 mm diameter of microporous titanosilicate K2TiSi3O9·H2O with umbite structure have been prepared without the use of organic structuring agents. These spheres are organized as micro/macroporous hierarchical materials with macropores in the 0.2–1.4 µm range of average size, showing that intraparticular resistance to water transport is not limiting. Also, similar ion exchange performance can be observed in the Ti‐umbite spheres and in the single crystals obtained under the same synthesis conditions.

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Self-Supporting Porous Zeolite Membranes with Sponge-like Architecture and Zeolitic Microtubes

Cited by 37 publications

References 34 publications

Inorganic Macroporous Films from Preformed Nanoparticles and Membrane Templates: Synthesis and Investigation of Photocatalytic and Photoelectrochemical Properties

Inorganic Macroporous Films from Preformed Nanoparticles and Membrane Templates: Synthesis and Investigation of Photocatalytic and Photoelectrochemical Properties

Bioinspired Porous Hybrid Materials via Layer‐by‐Layer Assembly

Spheres of Microporous Titanosilicate Umbite with Hierarchical Pore Systems

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