Water-Soluble Organo−Silica Hybrid Nanotubes Templated by Cylindrical Polymer Brushes

Müllner, Markus; Yuan, Jiayin; Weiß, Stephan; Walther, Andreas; Förtsch, Melanie; Drechsler, Markus; Müller, Axel H. E.

doi:10.1021/ja107132j

Cited by 132 publications

(96 citation statements)

References 46 publications

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“…The methods for shape control of silica NPs are mainly using templates [45, 46, 51, 52] or through polymer adsorption [49]. For example, silica nanotubes can be prepared with various templates, including anodic aluminum oxide membranes [46, 47], cylindrical polymer brushes [48], and nickel-hydrazine complex nanorods [50]. Recently, Kuijk et al reported the polyvinylpyrrolidone-mediated synthesis of monodisperse silica nanorods with tunable aspect ratio in an emulsion system (Fig.…”

Section: Synthesis and Control Of The Properties Of Silica Npsmentioning

confidence: 99%

Nonporous silica nanoparticles for nanomedicine application

2013

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Summary Nanomedicine, the use of nanotechnology for biomedical applications, has potential to change the landscape of the diagnosis and therapy of many diseases. In the past several decades, the advancement in nanotechnology and material science has resulted in a large number of organic and inorganic nanomedicine platforms. Silica nanoparticles (NPs), which exhibit many unique properties, offer a promising drug delivery platform to realize the potential of nanomedicine. Mesoporous silica NPs have been extensively reviewed previously. Here we review the current state of the development and application of nonporous silica NPs for drug delivery and molecular imaging.

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Section: Synthesis and Control Of The Properties Of Silica Npsmentioning

confidence: 99%

Nonporous silica nanoparticles for nanomedicine application

2013

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“…Recently, polymer brush, defined as a one-dimensional brush possessing densely grafted side chains on a linear polymer main chain or solid surfaces, has attracted much more attention due to their unique properties and several potential applications [1,2], such as high aspect ratio nanowires [3], supersoft elastomers [4], nanotubes and hollowed nanoparticles [5][6][7], photonic crystals [8][9][10], molecular tensile machines [11,12], and nanoporous materials [13,14]. Polymer brush has also been used in the liquid crystal display application for realizing the controllable alignment of liquid crystalline molecules in the devices.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Liquid Crystalline Polyferrocenylsilane Brush

Xiong

Wang

Qin

et al. 2014

J Inorg Organomet Polym

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A grafted side chain liquid crystalline polymer brush with poly(ferrocenylsilane) as the main chain and poly{6-(4 0 -butyloxyphenyl 4 00 -benzoyl)hexyl acrylate} as side chain has been synthesized by atom transfer radical polymerization (ATRP) technique. For comparison, a linear liquid crystalline polymer, poly{6-(4 0 -butyloxyphenyl-4 0 -benzoyl)hexyl acrylate}, was prepared by conventional radical polymerization method. Both of them were characterized by NMR, FT-IR, GPC and TGA. Their liquid crystalline properties have been investigated by means of differential scanning calorimetry, polarizing mciroscope and X-ray scattering. The liquid crystal phase behavior research demonstrated that both of them were reversible thermotropic nematic phase in the high temperature region and smectic A phase in the low temperature region. In comparison with linear liquid crystalline polymer, liquid crystalline polyferrocenylsilane brush exhibited the lower glass transition temperature (T g ) and clearing point (T NI ). Results showed that the brush architecture made the alignment of the mesogens more difficult than those in its monomer and linear polymer.

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“…For purposes of envisioning a most ideal case (e.g., a negative resist), the resist film and its synthetic chemistry would need to be much less random to allow the positioning of key functionalities in the film to become much more deterministic. [10][11][12] Figure 2 illustrates a conceptual design of a block bottle brush polymer, formed by sequential addition first with macromonomers with one set of functional groups for substrate alignment, followed by addition of different macromonomers of a second type of functional group to supply the needed lithographic crosslinking and development control properties. 1.…”

Section: Introductionmentioning

confidence: 99%

Bottom-up/top-down, high-resolution, high-throughput lithography using vertically assembled block bottle brush polymers

Trefonas¹,

Thackeray²,

Sun

et al. 2013

J. Micro/Nanolith. MEMS MOEMS

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We describe a novel deterministic bottom-up/top-down approach to sub-30-nm photolithography using a film composed of assembled block brush polymers of highly uniform composition and chain length. The polymer architecture consists of a rigid backbone of polymerized norbornene, each linked to flexible short side brush chains. The resultant bottle brush topology has a cylindrical shape with short brush chains arranged concentrically around the backbone, in which the cylinder radius is determined by the number of monomers within the brush fragment, while the cylinder length is determined by the degree of backbone polymerization. The modularity of the synthetic system allows a wide diversity of lithographically useful monomers, sequencing, dimension, and property variation. Sequential grafting of presynthesized blocks allows for facile formation of either concentric or lengthwise block copolymers. Placement of brush chains of different compositions along different regions of the cylinder, along with variation of the relative concentric and lengthwise dimensions, provides mechanisms to align and control placement of the cylinders. These polymers are compatible with photoacid generators and crosslinker functionality. Our results are consistent with a model that the bottle brush polymers assemble (bottom-up) in the film to yield a forest of vertically arranged cylindrical block brush polymers, with the film thickness determined by the coherence lengths of the cylinders. Subsequent imaging via electron beam (e-beam) or optical radiation yields a (top-down) mechanism for acid catalyzed crosslinking of adjacent cylinders. Uncrosslinked cylinders are removed in developer to yield negative photoresist patterns. Exposure doses are very low and throughputs are amenable to the requirements of extreme ultraviolet lithography. The limiting resolution with e-beam exposure is potentially about two cylinder diameters width (<8 nm), with the smallest observed patterns approaching 10 nm.

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Water-Soluble Organo−Silica Hybrid Nanotubes Templated by Cylindrical Polymer Brushes

Cited by 132 publications

References 46 publications

Nonporous silica nanoparticles for nanomedicine application

Nonporous silica nanoparticles for nanomedicine application

Synthesis and Characterization of a Liquid Crystalline Polyferrocenylsilane Brush

Bottom-up/top-down, high-resolution, high-throughput lithography using vertically assembled block bottle brush polymers

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