Facile Conversion of Colloidal Crystals to Ordered Porous Polymer Nets

Chen, Yiyan; Ford, Warren T.; Materer, and Nicholas F.; Teeters, Dale

doi:10.1021/ja002134i

Cited by 37 publications

(46 citation statements)

References 23 publications

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“…Two different treatment solutions (pH 2.3 and pH 2.2) were used to induce porosity in the PAH/PAA regions. The sandwich structuress (PAH/SPS) 50 -(PAH/PAA) m -(PAH/SPS) 50 (m ) 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6,7,8,9,10)swere immersed in a pH 2.3 acidic solution for 1 min followed by a 1 min rinse in deionized water. The (PAH/SPS) 50 -(PAH/ PAA) 7-10 -(PAH/SPS) 50 films turned cloudy after this treatment, suggesting that a high level of unwanted micropores was generated in heterostructures with the thickest PAH/PAA blocks (m ) 7, 8,9,10).…”

Section: Resultsmentioning

confidence: 99%

pH-Gated Porosity Transitions of Polyelectrolyte Multilayers in Confined Geometries and Their Application as Tunable Bragg Reflectors

et al. 2004

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Polyelectrolyte multilayers with alternating porous and fully dense regions have been assembled from poly(acrylic acid) (PAA), poly(allylamine hydrochloride) (PAH), and poly(sodium 4-styrenesulfonate) (SPS) in appropriate combinations. The porous zones were developed postassembly via immersion of the heterostructure film into an aqueous acidic medium followed by rinsing in deionized water. Properly assembled PAH/PAA regions exhibit a reversible, pH-gated nanoporosity transition while PAH/SPS regions remain unchanged upon treatment at low pH. The application of these structures as one-dimensional dielectric mirrors and vapor sensors has been investigated. Organic liquid crystal molecules were also successfully loaded selectively into the nanoporous regions via a capillary force driven wicking action. Potential applications for drug delivery and as Bragg stacks with tunable refractive index layers are also discussed.

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Section: Resultsmentioning

confidence: 99%

pH-Gated Porosity Transitions of Polyelectrolyte Multilayers in Confined Geometries and Their Application as Tunable Bragg Reflectors

et al. 2004

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“…Such a microporous structure is well known as "inverse opal" since its first demonstration by Velev and colleagues a decade ago [68]. Thus far, many reports have been made on a wide variety of inverse opal structures with ceramics [68][69][70][71][72], semiconductors [73][74][75], metals [76], carbon [77], and organic materials [78][79][80][81][82]. Although conventional CC films exhibit a PBG in a certain propagation direction, it is possible to produce a complete PBG in inverse opal structures with high contrast of refractive indices between the voids and backgrounds.…”

Section: Inverse Opalsmentioning

confidence: 99%

Self‐organized colloidal crystals for photonics and laser applications

Furumi¹,

Fudouzi

Sawada

2010

Laser & Photonics Reviews

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We present an overview of recent developments in the fabrication and uses of colloidal crystals (CCs) for photonics and laser applications. Microparticles with a diameter in the range from 10 nm to 10 µm often have an intrinsic capability to spontaneously organize themselves from a colloidal suspension into 3D lattice structures. Such highly ordered 3D architectures of microparticles are called colloidal crystals (CCs). The CC structures have received tremendous attention as one of the facile and high-throughput fabrication techniques of photonic crystals (PCs). We introduce here interesting precedents not only of diverse techniques of high-quality CC structures, but also of their versatile applications in optical sensors responding to various external stimuli. This review also highlights a new potential use of the CCs as low-threshold laser devices. We believe that a wide variety of CC architectures will play leading roles in the next generation of optoelectronic devices.Photograph of the laser action of the flexible polymer CC laser device by optical excitation above the threshold pulse energy.The inset is a high-resolution laser emission spectrum of a CC laser device. Reproduced with permission from [158].

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“…Another method employing core-shell structures as precursors for macroporous materials is core-shell rearrangement [140,141]. In this method, colloidal crystals composed of latex spheres with PS-rich cores and poly(2-hydroxyethyl methacrylate)-rich shells (i.e.…”

Section: Core-shell Assembly and Rearrangementmentioning

confidence: 99%

3D Ordered Macroporous Materials

Schroden

Stein

2003

Colloids and Colloid Assemblies

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IntroductionMaterials exhibiting a uniform arrangement of pores offer a wide variety of applications that are based on both the chemical properties of the solid matrix and properties specific to the pore size and arrangement. The International Union of Pure and Applied Chemistry (IUPAC) has classified porous materials into three distinct categories according to their pore diameters [1]. ªMicroporesº are those with diameters less than 2 nm, ªmesoporesº range from 2 to 50 nm, and ªmacro-poresº are greater than 50 nm in diameter [1]. Interest in the synthetic creation of ordered porous materials began with the desire to replicate or improve upon the unique properties that result from the crystalline microporous structure of natural zeolites. With small pore sizes, open frameworks, high specific surface areas, and extremely well-defined structures, zeolites have found commercial applications as adsorbents, molecular sieves, and size-or shape-selective catalysts [2]. However, zeolites are limited to applications involving small-molecule substrates. For chemical applications involving larger guest molecules, such as biological compounds or polymers, materials with larger pores are required.The development of laboratory techniques for the preparation of ordered porous materials with well-defined structures and pore sizes began in the 1950s with the creation of the first commercially significant synthetic zeolites, and has continued to the present [2]. The general procedure for the preparation of porous materials involves the use of sacrificial templates, space fillers, or structure directors around which a solid wall structure forms. Upon removal of the template by chemical or thermal methods, porous materials are produced. For zeolites, the sacrificial species is often a single molecule such as an alkyl-amine [2]. The size of the micropores of zeolites can be increased through the use of larger molecular templates, reaching a maximum pore size of approximately 2 nm [2]. While methods for preparing ordered microporous materials have been known for over fifty years, techniques for the fabrication of ordered materials with larger pores have only been developed since the early 1990s.A new era in porous materials synthesis began with the development of techniques based on the use of self-assembled molecular arrays, instead of single mol-465 15

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Facile Conversion of Colloidal Crystals to Ordered Porous Polymer Nets

Cited by 37 publications

References 23 publications

pH-Gated Porosity Transitions of Polyelectrolyte Multilayers in Confined Geometries and Their Application as Tunable Bragg Reflectors

pH-Gated Porosity Transitions of Polyelectrolyte Multilayers in Confined Geometries and Their Application as Tunable Bragg Reflectors

Self‐organized colloidal crystals for photonics and laser applications

3D Ordered Macroporous Materials

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