Induced Chain Alignment of Conjugated Polymers Within Nanoporous Template

Lo, Kuan Hsin; Ho, Rong Ming; Liao, Yung Ming; Hsu, Chain‐Shu; Massuyeau, Florian; Zhao, Y.; Lefrant, S.; Duvail, Jean‐Luc

doi:10.1002/adfm.201002573

Cited by 17 publications

(15 citation statements)

References 45 publications

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“…Polymeric nanoporous materials were widely studied and applied in sensing [57], separation [58], and replica fabrication [40,59] due to their flexibility [57,59], availability and variety of chemical composition [58,60], and functionality due to surface functionalization [61]. A great number of porous polymer materials with nanopores have been reported.…”

Section: Synthesis Of Nano-porous Materials With Hierarchical Poresmentioning

confidence: 99%

Synthesis, Characterization, and Applications of Nanoporous Materials for Sensing and Separation

Jiao¹,

Flynn²,

Kohli³

2015

Handbook of Nanoparticles

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In the past two decades, nanoparticles have been widely studied from fundamental and applications viewpoints. They have been used in a range of applications including chemical and biosensing, gene and drug delivery, and electronics, mechanical, and optical device fabrication. The synthesis of nanoparticles with controlled dimensions is important because the properties of nanoparticles are size and shape dependent. This chapter emphasizes template-assisted synthesis and characterization of nanoparticles. Template synthesis provides nanoparticles with controlled shape and size with high reproducibility and yield. The chapter also includes synthesis and characterization of different templates including nanoporous alumina and polymer membranes, zeolites, and self-assembled organic and biomaterials as well. The application of biosensing and bioseparation using nanoparticles is discussed in detail and special emphasis is given to single pore-based detection and sensing of nucleic acids and proteins.

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Section: Synthesis Of Nano-porous Materials With Hierarchical Poresmentioning

confidence: 99%

Synthesis, Characterization, and Applications of Nanoporous Materials for Sensing and Separation

Jiao¹,

Flynn²,

Kohli³

2015

Handbook of Nanoparticles

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“…Insets show the plots of the intensity of first peak (498 nm) versus annealing time. 56 Degradable block copolymers and their applications M-S She et al…”

Section: Nanohybrids From Nanoporous Thin-film Templates and Their Apmentioning

confidence: 99%

“…56 The nanoporous PS template was removed from a glass substrate, floated on an aqueous surface and then finally collected by a glass substrate coated with the DP-PPV-PEO thin film. Subsequently, the nanoporous PS template on the spin-coated PVE thin film was treated with the solvent vapor of acetic acid at different accumulated annealing times.…”

Section: Nanohybrids From Nanoporous Thin-film Templates and Their Apmentioning

confidence: 99%

Nanostructured thin films of degradable block copolymers and their applications

She

Hsueh

et al. 2013

NPG Asia Mater

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Nanopatterning using self-assembled thin films of degradable block copolymers (BCPs) has attracted considerable attention and inspired a variety of appealing applications in different research areas. To create useful nanopatterns for practical uses, controlling the orientation of the BCP microdomains is essential. The generation of oriented microdomains in BCP thin films will be discussed in this article. This discussion is followed by a review of methods that use polylactide-containing BCP (that is, polystyrene-b-poly(L-lactide) (PS-PLLA)) thin films to generate nanoporous PS after hydrolysis, which can be used for templated synthesis to create functional nanohybrids. The nanoporous PS thin films with well-oriented cylinder nanochannels can be used for pore-filling various ingredients to create specific drug delivery systems and optoelectronic devices. Moreover, by utilizing templated synthesis, nanoporous ceramics with a high-specific surface area and high porosity can be fabricated for optical applications using hydrolyzed gyroid-forming PS-PLLA as a template for the sol-gel reaction. In addition, the nanolithography applications using silicon-containing BCP (that is, polystyrene-b-polydimethylsiloxane) thin films, which can form inorganic nanoporous templates after oxygen plasma treatment, will be discussed in this review. In recent decades, block copolymers (BCPs) have been extensively investigated because of their ability to self-assemble into various ordered nanostructures, such as spheres, cylinders, gyroids and lamellae, owing to the incompatibility of their constituent blocks and the corresponding chemical junction. 1,2 Well-defined nanostructured phases can be tailored by the molecular engineering of synthetic BCPs to obtain promising features for nanotechnological applications. For such nanostructured materials to prove useful in thin-film applications, thin-film samples with oriented periodic arrays over a large area must be formed to generate a uniform thickness and sufficiently thin films with well-ordered BCP microdomains. Nanoporous materials from BCP thin films have been attracted considerable attention owing to their appealing applications in different research areas. The etching techniques used to generate nanoporous materials can be classified as wet and dry processes depending on the etching methods. 3 The wet etching process is a common approach for fabricating nanoporous materials. By utilizing the degradable character of polymer chains, nanoporous polymers can be fabricated using self-assembled nanostructures through the selective degeneration of one of the constituent blocks. For instance, polylactide-containing BCPs can be used to fabricate nanoporous polymeric materials because of the unstable character of the ester group, which can be hydrolytically decomposed. 4 After hydrolysis of the polylactide segments, a nanoporous thin film with a uniform thickness and domain size can be successfully prepared on different substrates. Consequently, the nanoporous thin films can be used as nanor...

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“…Some conjugated polymers have been reported to align homeotropically on substrates to form thin films for organic photovoltaics2425262728. However, such oriented films are as thick as only 300 nm at most25.…”

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confidence: 99%

A design principle of polymers processable into 2D homeotropic order

et al. 2016

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How to orient polymers homeotropically in thin films has been a long-standing issue in polymer science because polymers intrinsically prefer to lie down. Here we provide a design principle for polymers that are processable into a 2D homeotropic order. The key to this achievement was a recognition that cylindrical polymers can be designed to possess oppositely directed local dipoles in their cross-section, which possibly force polymers to tightly connect bilaterally, affording a 2D rectangular assembly. With a physical assistance of the surface grooves on Teflon sheets that sandwich polymer samples, homeotropic ordering is likely nucleated and gradually propagates upon hot-pressing towards the interior of the film. Consequently, the 2D rectangular lattice is constructed such that its b axis (side chains) aligns along the surface grooves, while its c axis (polymer backbone) aligns homeotropically on a Teflon sheet. This finding paves the way to molecularly engineered 2D polymers with anomalous functions.

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Induced Chain Alignment of Conjugated Polymers Within Nanoporous Template

Cited by 17 publications

References 45 publications

Synthesis, Characterization, and Applications of Nanoporous Materials for Sensing and Separation

Synthesis, Characterization, and Applications of Nanoporous Materials for Sensing and Separation

Nanostructured thin films of degradable block copolymers and their applications

A design principle of polymers processable into 2D homeotropic order

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