Supramolecular Multiscale Fibers through One‐Dimensional Assembly of Dendritic Molecules

Ornatska, Maryna; Peleshanko, Sergiy; Rybak, Beth; Holzmueller, Jason; Tsukruk, Vladimir V.

doi:10.1002/adma.200400334

Cited by 53 publications

(53 citation statements)

References 62 publications

(16 reference statements)

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“…12,13 Other macromolecular architectures, such as star-shaped block copolymers, have been found to exhibit interesting aggregation behavior, [14][15][16][17][18][19][20][21] which can be used for a guided formation of fluorescent nanofibers and microfibers. 22,23 The multiple terminal groups are used to control the assembly of the molecules in solution, and at surfaces and interfaces [24][25][26][27][28][29][30][31][32] as well as their stimuli-responsive behavior. 33,34 Unique morphologies were found in branched and star block copolymers that are not observed for linear block copolymers.…”

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confidence: 99%

Assembling hyperbranched polymerics

Peleshanko¹,

Tsukruk²

2011

J Polym Sci B Polym Phys

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A condensed overview discusses the existing grafting approaches and the surface behavior of various hyperbranched polymers. We focus on the recent strategies and corresponding characterization of the resulting surface morphologies and structures with a number of relevant recent results from the authors' own research and existing literature. Some results discussed here are important for prospective applications of hyperbranched polymers in biomedical fields, for resistive coatings, tough blends, and reinforced nanocomposites are briefly summarized as well. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 50: 83-100, 2012 KEYWORDS: adsorption; hyperbranched; LB films; structural characterization; surfaces INTRODUCTION This publication presents a condensed overview of the existing grafting approaches as applied to hyperbranched polymers and discusses the surface morphologies of these polymers and corresponding composites and coatings. We mostly focus on the recent strategies and corresponding characterization of the resulting surface morphologies and structures developed in the authors' group with some relevant examples from current literature. A number of relevant results are also included here especially in relation to recent developments related to novel synthetic approaches of hyperbranched molecules as well as emerging applications of hyperbranched polymers and coatings for biomedical purposes, as resistive coatings, tough blends, and reinforced nanocomposites. Some comprehensive recent reviews on highly branched polymers, which are focused mainly on synthetic aspects can be found in literature.

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confidence: 99%

Assembling hyperbranched polymerics

Peleshanko¹,

Tsukruk²

2011

J Polym Sci B Polym Phys

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“…13,14 Thayumanavan et al showed amphiphilic dendrimers, which on substrates associate into superhydrophobic films, given by disklike assemblies of roughly 200 nm diameter. 15 We show in this Communication that a new dendrimer-based system spontaneously self-assembles into a thin film of highly ordered micrometer-scale domain structure. The system used is based on a series of uracil-PAMAM dendrimers from generation 0 (tetrafunctional) to generation 4 (64 chain endfunctional groups) mixed with the organosilane coupling agent (3-(methylamino)propyl)trimethoxysilane (MAP).…”

mentioning

confidence: 80%

Self-Assembly of Uracil−PAMAM Dendrimer Systems into Domains of Micrometer Length Scale

Lohse

Ivanov

Andreasen³

et al. 2007

Macromolecules

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Molecular self-assembly has over the past decades attracted significant attention due to its novel structural organizations and potential applications in advanced nanotechnology. Studies have in particular concerned block copolymer systems of various architectures which have been shown to form highly ordered nanometer scaled structures in the bulk, 1,2 in solution, 3 or in thin films. 4 Block copolymer lithography has drawn special attention due to the wide range of potential applications within the microelectronics industry. [4][5][6] The characteristic length scale of these polymeric systems is in the range 1-10 nm as determined by the overall size of the polymer coil. Even though this nanometer length scale is attractive for a variety of future developments, many applications will remain restricted domain structures approaching the scale of visible light wavelengths, e.g., memory devices addressed by laser light and photonic band-gap materials. As a result, it remains a challenge to control molecular selfassembly on an even larger scale to create micrometer patterning. Some success in this area has been achieved by synthesizing molecules of extreme molar masses, 7 by swelling the nanoscale structures into microscale, 8 and by the assembly of shell crosslinked nanoparticles. 9 Another approach has been to utilize the selective wetting of thin-film block copolymers to a surface where mismatch between thickness and domain size may lead to the formation of micrometer scaled islands or holes. 10-12 A more recent approach has been to utilize self-organization from a receding meniscus in dewetting processes, leading to aligned micrometer-scale lamellae. 13 Recently, there have been reports on molecular assemblies of dendrimers and other highly branched molecules. Tsukruk et al., for example, reported self-association into nanometer thick, macroscopically long molecular fibers, where the driving forces were speculated being related to hydrogen bonding, π-bonding, crystallization, or combinations of these. 13,14 Thayumanavan et al. showed amphiphilic dendrimers, which on substrates associate into superhydrophobic films, given by disklike assemblies of roughly 200 nm diameter. 15 We show in this Communication that a new dendrimer-based system spontaneously self-assembles into a thin film of highly ordered micrometer-scale domain structure. The system used is based on a series of uracil-PAMAM dendrimers from generation 0 (tetrafunctional) to generation 4 (64 chain endfunctional groups) mixed with the organosilane coupling agent (3-(methylamino)propyl)trimethoxysilane (MAP). The uracil-PAMAM dendrimers were synthesized by coupling the synthesized uracil-1-acetic acid with the free primary amino groups at the chain ends of commercially available PAMAM dendrimers (Aldrich). 17 MAP reactant was obtained from Aldrich and used without further purification. Films were made by mixing 2 mg of the uracil-PAMAM dendrimer into a 1 mL solution of 1 wt % MAP in Milli-Q water. The mixture was filtered through a 0.22 µm Millex-GS to en...

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“…One challenge in this area is the need to maintain membrane integrity during the immobilization process, which makes it difficult to immobilize membrane proteins in their active form [96]. This has been performed by coating a solid surface such as silicon or glass with a suitable polymer [97] or lipid [98], followed by incorporation of the membrane proteins on this layer. Another approach for the immobilization of membrane-bound receptors is to entrap such proteins in a silica sol-gel [96].…”

Section: Other Immobilization Methodsmentioning

confidence: 99%

Applications of silica supports in affinity chromatography

Schiel

Mallik

Soman

et al. 2006

J of Separation Science

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The combined use of silica-based chromatographic supports with immobilized affinity ligands can be used in many preparative and analytical applications. One example is the use of silica-based affinity columns in HPLC, giving rise to a method known as high-performance affinity chromatography (HPAC). This review discusses the role that silica has played in the development of affinity chromatography and HPAC and the applications of silica in these methods. This includes a discussion of the types of ligands that have been employed with silica and the methods by which these ligands have been immobilized. Various formats have also been presented for the use of silica in affinity chromatographic methods, including assays involving direct or indirect analyte detection, on-line or off-line affinity extraction, and chiral separations. The use of silica-based affinity columns in studies of biological systems based on zonal elution and frontal analysis methods will also be considered.

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Supramolecular Multiscale Fibers through One‐Dimensional Assembly of Dendritic Molecules

Cited by 53 publications

References 62 publications

Assembling hyperbranched polymerics

Assembling hyperbranched polymerics

Self-Assembly of Uracil−PAMAM Dendrimer Systems into Domains of Micrometer Length Scale

Applications of silica supports in affinity chromatography

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