Synthesis of hollow silica nanostructures using functional hairy polymer nanofibers as templates

Sanwaria, Sunita; Pal, Jit; Srivastava, Rajiv K.; Stamm, Manfred; Horechyy, Andriy; Nandan, Bhanu

doi:10.1039/c3ra42692k

Cited by 12 publications

(11 citation statements)

References 25 publications

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“…The actual morphology for the PS(18500)-b-P4VP(40500) block copolymer, which was mostly used in this work, was confirmed using small angle X-ray scattering (SAXS) and TEM measurements (details in supporting information). The cylindrical domains were subsequently isolated in ethanol as nanofibers on which further sol-gel synthesis of titania shell was done using TTIP as the precursor [23,24]. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The important prerequisites here are sufficiently high χN value and strong solvent selectivity towards one of the block. Recently, we have shown that in the case of polystyrene-blockpoly(4-vinylpyridine) (PS-b-P4VP), the core-shell type of hairy nanofibers with PS core and hairy P4VP shell could be easily isolated in a solvent selective for P4VP block and without any additional cross-linking step [23,24]. These nanofibers potentially could be functionalized with a range of functional materials driven by the chemically active nature of the P4VP shell.…”

Section: Introductionmentioning

confidence: 98%

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Fabrication of titania nanostructures using core–shell polymer nanofibers from block copolymers as templates

Sanwaria

Singh

Horechyy

et al. 2016

Nano-Structures & Nano-Objects

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Fabrication of titania nanostructures using core–shell polymer nanofibers from block copolymers as templates

Sanwaria

Singh

Horechyy

et al. 2016

Nano-Structures & Nano-Objects

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“…Such micelles comprising an inner PS core and outer P4VP corona can be obtained with the aid of P4VP-selective solvents, for instance, alcohols. Alcoholic PS- b -P4VP micellar solutions are particularly attractive for the synthesis of various polymer-inorganic core–shell, yolk–shell particles, or hollows particles, by exploring advantages of sol-gel processes [16,17,18]. Although the strong affinity of alcohols toward P4VP is known from the literature [11], to the best of our knowledge, there has been no effort to understand the effect of solvent on the PS- b -P4VP micellization process taking place in different alcohols.…”

Section: Introductionmentioning

confidence: 99%

Amphiphilic Block Copolymer Micelles in Selective Solvents: The Effect of Solvent Selectivity on Micelle Formation

et al. 2019

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We investigated the micellar behavior of a series of asymmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) block copolymers in different P4VP-selective alcoholic solvents. The micellar behavior was further correlated with the spectroscopic ellipsometry results obtained on swelling of PS and P4VP polymer films in the corresponding solvent vapors. The time-resolved (in situ) dynamic light scattering (DLS) measurements, in combination with (ex situ) electron microscopy imaging, revealed information about the aggregation state of PS-b-P4VP BCP in different alcohols and the effect of heat treatment. The ellipsometry measurements allowed us to estimate the difference in solvent selectivity toward PS/P4VP pair. Both DLS and ellipsometric studies suggested that less polar alcohols (i.e., 1-propanol, 1-butanol, and 1-pentanol) are likely to be close to each other in terms of their selectivity toward PS/P4VP pair, whereas more polar ethanol and methanol show the highest and the lowest affinity toward P4VP, respectively.

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“…BCP micelles were used to accommodate various precursors and/or presynthesized nano-catalysts in specific domains, and also provides a low-cost option to deposit thin film on substrates, such as via evaporation and sputtering. BCPs having blocks capable of coordinating with metals or metal ions, like P4VP or P2VP [14][15][16][17], have been most frequently used for the templating of inorganic materials. The slow exchange kinetics in BCPr micelles allows an easy transfer of the micelles from colloidal solution onto a substrate by exploring different deposition methods, such as spin-coating or dip-coating.…”

Section: Micellar/colloidal Assembly And/or On-substrate Approachmentioning

confidence: 99%

Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives

et al. 2021

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Fabrication of block copolymer (BCP) template-assisted nano-catalysts has been a subject of immense interest in the field of catalysis and polymer chemistry for more than two decades now. Different methods, such as colloidal route, on-substrate methods, bulk self-assembly approaches, combined approaches, and many others have been used to prepare such nano-catalysts. The present review focuses on the advances made in this direction using diblock, triblock, and other types of BCP self-assembled structures. It will be shown how interestingly, researchers have exploited the features of tunable periodicity, domain orientation, and degree of lateral orders of self-assembled BCPs by using fundamental approaches, as well as using different combinations of simple methods to fabricate efficient catalysts. These approaches allow for fabricating catalysts that are used for the growth of single- and multi-walled carbon nanotubes (CNTs) on the substrate, size-dependent electrooxidation of the carbon mono oxide, cracking of 1,3,5-triisopropylbenzene (TIPB), methanol oxidation, formic acid oxidation, and for catalytic degradation of dyes and water pollutants, etc. The focus will also be on how efficient and ease-of-use catalysts can be fabricated using different BCP templates, and how these have contributed to the fabrication of different nano-catalysts, such as nanoparticle array catalysts, strawberry and Janus-like nanoparticles catalysts, mesoporous nanoparticles and film catalysts, gyroid-based bicontinuous catalysts, and hollow fiber membrane catalysts.

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Synthesis of hollow silica nanostructures using functional hairy polymer nanofibers as templates

Abstract: Hollow silica nanofibers and nanospheres were synthesized from functional hairy polymer nanofibers as sacrificial templates. The polymer nanofibers were isolated from a cylinder-forming polystyrene-block-poly(4-vinylpyridine) block copolymer using a selective-swelling approach.

Cited by 12 publications

References 25 publications

Fabrication of titania nanostructures using core–shell polymer nanofibers from block copolymers as templates

Fabrication of titania nanostructures using core–shell polymer nanofibers from block copolymers as templates

Amphiphilic Block Copolymer Micelles in Selective Solvents: The Effect of Solvent Selectivity on Micelle Formation

Block Copolymer Template-Directed Catalytic Systems: Recent Progress and Perspectives

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