Polymer−Silica Hybrid Monolayers as Precursors for Ultrathin Free-Standing Porous Membranes

Xu, Hui; Goedel, Werner A.

doi:10.1021/la011026m

Cited by 83 publications

(72 citation statements)

References 35 publications

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“…Crosslinking the nanoparticle-polyisoprene film by UV radiation, followed by dissolution of the silica particles, gave robust polymer membranes with pore sizes between 30 and 500 nm. [31][32][33][34] It remains a challenge, though, to fabricate capsules and membranes with precisely controlled pore size and pore size distribution on the lower nanometer scale. Capsules with pores between 5 and 20 nm have been a long-standing goal for encapsulation and immunoisolation of cells for treatment of diabetes, cancer and other illnesses.…”

Section: Nanoparticles As Building Blocksmentioning

confidence: 99%

Self-assembly of nanoparticles at interfaces

et al. 2007

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Developments in the assembly of nanoparticles at liquid-liquid interfaces are reviewed where the assemblies can be controlled by tuning the size of the nanoparticles and the chemical characteristics of the ligands. Both synthetic and biological nanoparticles are discussed. By controlling the type of ligands, uniform and Janus-type nanoparticles can be produced where, at liquid-liquid interfaces, subsequent reactions of the ligands can be used to generate crosslinked sheets of nanoparticles at the interface that have applications including novel encapsulants, filtration devices with well-defined porosities, and controlled release materials. By controlling the size and volume fraction of the nanoparticles and the chemical nature of the ligands, nanoparticle-polymer composites can be generated where either enthalpy or entropy can be used to control the spatial distribution of the nanoparticles, thereby, producing auto-responsive materials that self-heal, self-corral assemblies of nanoparticles, or self-direct morphologies. Such systems hold great promise for generating novel optical, acoustic, electronic and magnetic materials.

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Section: Nanoparticles As Building Blocksmentioning

confidence: 99%

Self-assembly of nanoparticles at interfaces

et al. 2007

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“…[139] Xu and Goedel then used the self-assembly of hydrophobized silica colloids and polyisoprenes to produce super thin and freestanding membranes of only 10-50 nm thickness. [140] They then extended their work to silica based pore forming and generalized the concept to particle assisted pore forming of super thin films. [34,141] With the help of Yan et al, the concept was extended to multiple layers of template resulting in 3D porous membranes.…”

Section: Optical Applicationsmentioning

confidence: 99%

Porous Polymer Membranes by Hard Templating – A Review

2017

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Membranes are designed to bridge a precise separation process at the nanoscale with industrial applications running at cubic meters per hour. This review outlines materials applied in membrane production with a particular focus on polymers. Membrane performance and created value are directly linked to controlled pore formation. Their economic relevance has created a number of large companies and associated academic research at top institutions. The authors review, therefore, starts from well-established techniques applied in products and then moves on to evolving concepts from academia. Pore formation through hard templating is a versatile field for separation processes. A more detailed view is given on the two known concepts for nanopore formation, namely colloidal templates and random hard salt templating. A comparison between these two concepts underlines their relevance to combine a process specific separation with large scale manufacturing requirements (i.e., upscale possibility, flexible process control and environmental impact).

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“…Structure transcription from colloidal particle assemblies has also been reported. Xu and Goedel proposed a method using colloidal assembly at the air-water interface (figure 124) [1018]. First, a mixed monolayer of colloidal silica (diameter, 140 nm) coated with hydrophobic polymer and polyisoprene-type amphiphilic polymer was spread on water, and followed by cross-linking of the polymer using UV irradiation.…”

Section: Molecular Arrays and Materials Arrays On Surfacesmentioning

confidence: 99%

Challenges and breakthroughs in recent research on self-assembly

Ariga

Hill

Lee

et al. 2008

Science and Technology of Advanced Materials

739

410

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The controlled fabrication of nanometer-scale objects is without doubt one of the central issues in current science and technology. However, existing fabrication techniques suffer from several disadvantages including size-restrictions and a general paucity of applicable materials. Because of this, the development of alternative approaches based on supramolecular self-assembly processes is anticipated as a breakthrough methodology. This review article aims to comprehensively summarize the salient aspects of self-assembly through the introduction of the recent challenges and breakthroughs in three categories: (i) types of self-assembly in bulk media; (ii) types of components for self-assembly in bulk media; and (iii) self-assembly at interfaces.

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Polymer−Silica Hybrid Monolayers as Precursors for Ultrathin Free-Standing Porous Membranes

Cited by 83 publications

References 35 publications

Self-assembly of nanoparticles at interfaces

Self-assembly of nanoparticles at interfaces

Porous Polymer Membranes by Hard Templating – A Review

Challenges and breakthroughs in recent research on self-assembly

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