Micellar Structures of Poly(styrene-<i>b</i>-4-vinylpyridine)s in THF/Toluene Mixtures and Their Functionalization with Gold

Ali, Nauman; Park, Soo‐Young

doi:10.1021/la800860q

Cited by 21 publications

(22 citation statements)

References 53 publications

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“…As THF has a preferential affinity for PS compared to P4VP (reported Flory-Huggins interaction parameters χ PS-THF = 0.35 and χ P4VP-THF = 0.6) [27], PS-b-P4VP micelles of a PS corona and a P4VP core have been observed in THF solutions [28]. However, the micellization is highly dependent on a number of variables, such as P4VP block ratio, P4VP block molecular weight and PS-b-P4VP concentration [29]. Our PS-b-P4VP solution in THF is optically clear, and the hydrodynamic radius (R h ), obtained from the DLS measurement, is 7.5 nm, indicating that no large aggregates are formed, probably due to the low P4VP weight fraction (∼0.175), the small M P4VP n , and the low polymer concentration.…”

Section: Resultsmentioning

confidence: 99%

Hexagonally ordered nanoparticles templated using a block copolymer film through Coulombic interactions

Lee¹,

Lee²,

Zhang³

et al. 2013

Nanotechnology

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We present a novel and simple method for forming hexagonal gold nanoparticle arrays that uses Coulombic interactions between negatively charged gold nanoparticles on positively charged vertically oriented poly(4-vinylpyridine) cylinders formed in a spin cast polystyrene-b-poly(4-vinylpyridine) block copolymer film. Exposure of the block copolymer film to dibromobutane vapor quaternizes and crosslinks the poly(4-vinylpyridine) domains which allows for the templated deposition of gold nanoparticles into a self-assembled hexagonal array through electrostatic interactions. These systems can form the basis for sensors or next generation nanoparticle based electronics.

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Section: Resultsmentioning

confidence: 99%

Hexagonally ordered nanoparticles templated using a block copolymer film through Coulombic interactions

Lee¹,

Lee²,

Zhang³

et al. 2013

Nanotechnology

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“…Thus, more morphological changes can be expected from the crew-cut micelles than the hairy micelles by changing solvent selectivity. 23 The vesicle of PS-b-P4VP was observed in the selective solvent without adding small molecules. This observation might be due to the more systematic screening of the solvent selectivity.…”

Section: Resultsmentioning

confidence: 99%

“…The toluene/ethanol system covers from PS-selective, to neutral, and to P4VP-selective solvents although our previous THF/toluene system covers only from neutral to PS-selective solvents. 23 Thus, we expected that a wider range of the micellar morphologies can be formed in the toluene/ethanol solvent system. The solvent selectivity was narrowly screened by changing the mixing ratio of the two solvents.…”

Section: Introductionmentioning

confidence: 99%

Structures of the cylindrical and vesicular micelles of an P4VP-longer asymmetric PS-b-P4VP

et al. 2009

Self Cite

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IntroductionThe control of the self-assembled micellar morphology of amphiphilic block copolymers in a selective solvent has engrossed substantial interests in the theoretical and applied research fields. [1][2][3] The micellar morphology of the block copolymers can be controlled by solvent selectivity and block copolymer composition. 4 There are three main factors for controlling these morphologies, i.e., the stretching of core blocks, the repulsive interaction among corona chains, and the surface tension of the core/corona interface at the onset of micellization. 5,6 The block copolymer can selfassemble into spherical, cylindrical, and vesicular micelles in a given solution. 4 Among those micelles, the vesicle has fascinated scientists because of its diverse applications such as drug delivery diagnostics, 7 electronics (chip nanopatterning), 8 and catalysis (enzyme entrapment). 9 Vesicles (generally kinetically trapped and non-equilibrium) 10 are usually formed by low molecular materials such as surfactants or lipids.Wittmann et al. for the first time reported the polymeric vesicles of poly(styrene-b-isoprene) (PS-b-PI) and poly(styrene-b-ethylene oxide) (PS-b-PEO) in a mixture of ethyl benzene (a selective solvent for both blocks) and n-decane (a PI and PEO selective solvent). 11 Schrage et al. investigated vesicular morphologies of quaternized poly(1-methyl-4-vinyl pyridine-b-styrene) and poly(1,2-butadiene-b-(cesium methacrylate)) which were self-assembled in THF (nonselective for PS and poly(1,2-butadiene) but selective for charged blocks). 12 Kesselman et al. also studied the change in the vesicular morphologies of PS-b-PI by controlling solvent selectivity in diethyl phthalate (less PS-selective) and dimethyl phthalate (highly PS-selective) mixtures. 13 Putaux et al. investigated the vesicular morphologies of PS-b-PI in n-heptane and n-decane, both of which are selective solvents for PI. 14 The PS-b-P4VP vesicles have been observed when the P4VP blocks were complexed with other small molecules. [15][16][17][18][19] The vesicles of PS-b-P4VP in chloroform were observed when perfluorooctanoic acid (PFOA) was added to be complexed with P4VP. 18 Peng et al. also reported another interesting research on the vesicular morphology of PS-b-P4VP in a complex form with low molecular-weight aliphatic acids (stearic acid, decanoate, acetic acid, and formic acid) in chloroform (non-selective for PS-b-P4VP and aliphatic acids but selective in a complex form). 20 But, PS-b-P4VP vesicles without complexation were rarely observed. The cylindrical morphology of an asymmetric PS(19600)-b-P4VP(5100) (PS longer) in P4VP selective solvents was reported. However, the vesicles with asymmetric PS-b-P4VPs (P4VP longer) in PS selective solvents have not been reported. The block length of P4VP of the PS-b-P4VP is of prime importance because a number of valuable metals or small molecules could be complexed with the P4VP core of micelles (in the PS selective solvents) which is utilized as a nanoreactor.The screening of the solvent sel...

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“…Among them, properties of the polymeric micelles, including the lengths of different stabilizing blocks and softness of stabilizing micelle cores were also employed [16]. However, glyco-NPs have not been utilized for preparation of Janus hybrid particles.…”

Section: Synthesis and Characterization Of Triblock Glycopolymersmentioning

confidence: 99%

A facile approach to prepare hybrid nanoparticles with morphology controlled by the thickness of glyco-shell

Zhang

Chen

2015

Chinese Chemical Letters

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Micellar Structures of Poly(styrene-b-4-vinylpyridine)s in THF/Toluene Mixtures and Their Functionalization with Gold

Cited by 21 publications

References 53 publications

Hexagonally ordered nanoparticles templated using a block copolymer film through Coulombic interactions

Hexagonally ordered nanoparticles templated using a block copolymer film through Coulombic interactions

Structures of the cylindrical and vesicular micelles of an P4VP-longer asymmetric PS-b-P4VP

A facile approach to prepare hybrid nanoparticles with morphology controlled by the thickness of glyco-shell

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