Thermal Approaches to Perpendicular Block Copolymer Microdomains in Thin Films: A Review and Appraisal

Wang, Hyun Suk; Kim, Ki‐Hyun; Bang, Joona

doi:10.1002/marc.201800728

Cited by 33 publications

(36 citation statements)

References 171 publications

(335 reference statements)

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“…19 However, one could suppress preferential interactions at a surface using methods that are already established for block copolymer lithography, including surface-active additives or thin "neutral" coatings on the electrodes. 30,31 ■ ASSOCIATED CONTENT * sı Supporting Information…”

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confidence: 99%

Surface-Induced Ordering Depresses Through-Film Ionic Conductivity in Lamellar Block Copolymer Electrolytes

et al. 2020

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Lamellar block copolymers based on polymeric ionic liquids (PILs) show promise as electrolytes in electrochemical devices. However, these systems often display structural anisotropy that depresses the through-film ionic conductivity. This work hypothesizes that structural anisotropy is a consequence of surface-induced ordering, where preferential adsorption of one block at the electrode drives a short-range stacking of the lamellae. This point was examined with lamellar diblock copolymers of polystyrene (PS) and poly(1-(2-acryloyloxyethyl)-3-butylimidazolium bis(trifluoromethanesulfonyl)imide) (PIL). The bulk PS–PIL structure was comprised of randomly oriented lamellar grains. However, in thin PS–PIL films (100–400 nm), the lamellae were stacked normal to the plane of the film, and islands/holes were observed when the as-prepared film thickness was incommensurate with the natural lamellar periodicity. Both of these attributes are well-known consequences of preferential wetting at surfaces. The ionic conductivity of thick PS–PIL films (50–100 μm) was approximately 20× higher in the in-plane direction than in the through-plane direction, consistent with a mixed structure comprised of randomly oriented lamellae throughout the interior of the film and highly oriented lamellae at the electrode surface. Therefore, to fully optimize the performance of a block copolymer electrolyte, it is important to consider the effects of surface interactions on the ordering of domains.

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confidence: 99%

Surface-Induced Ordering Depresses Through-Film Ionic Conductivity in Lamellar Block Copolymer Electrolytes

et al. 2020

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“…For example, liquid crystals sensitive to temperature or strain form aligned lattices and facilitate interactive nanoparti cles, [394][395][396] ice crystals can lead to the organized assembly of both 1D and 2D nanoparticles, [397][398][399][400] and BCP display two or even more distinct phases, of which one attracts the nanopar ticles and the other repels them, resulting in favorable nano particle placement. [401][402][403] Templates of substrate patterns with nanoscale features can be created via transfer lithography or prestress applied elastomers. [404,405] The deposition of nano particles on top of these template patterns can influence nano particle orientations.…”

Section: D Printed Surface Patterning-directed Assemblymentioning

confidence: 99%

3D Printing‐Enabled Nanoparticle Alignment: A Review of Mechanisms and Applications

Jambhulkar

Ravichandran

et al. 2021

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3D printing (additive manufacturing (AM)) has enormous potential for rapid tooling and mass production due to its design flexibility and significant reduction of the timeline from design to manufacturing. The current state-of-the-art in 3D printing focuses on material manufacturability and engineering applications. However, there still exists the bottleneck of low printing resolution and processing rates, especially when nanomaterials need tailorable orders at different scales. An interesting phenomenon is the preferential alignment of nanoparticles that enhance material properties. Therefore, this review emphasizes the landscape of nanoparticle alignment in the context of 3D printing. Herein, a brief overview of 3D printing is provided, followed by a comprehensive summary of the 3D printing-enabled nanoparticle alignment in wellestablished and in-house customized 3D printing mechanisms that can lead to selective deposition and preferential orientation of nanoparticles. Subsequently, it is listed that typical applications that utilized the properties of ordered nanoparticles (e.g., structural composites, heat conductors, chemo-resistive sensors, engineered surfaces, tissue scaffolds, and actuators based on structural and functional property improvement). This review's emphasis is on the particle alignment methodology and the performance of composites incorporating aligned nanoparticles. In the end, significant limitations of current 3D printing techniques are identified together with future perspectives.

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“…[148,149] Self-assembly of BCPs from conventional methods does not generically afford such long-range control of nanostructural orientation, and therefore numerous research efforts have been dedicated to this area. [150][151][152][153][154][155][156] These efforts include the use of theory and molecular simulation approaches, [157,158] paired with developing advanced processing techniques and in situ characterization techniques to explore assembly dynamics and pathway toward producing highly aligned BCPs. While several excellent contributions have already discussed directed self-assembly (DSA) of polymers within the scope of assembly physics and instrumentation in great detail, [30,105,[159][160][161][162][163] our goal here is to describe the physical phenomena and mechanisms of each experimental approach for BCP alignment, and more importantly to highlight the significance of the structure-property relationship in anisotropic block copolymers and their relevant applications.…”

Section: Introductionmentioning

confidence: 99%

Developing Anisotropy in Self‐Assembled Block Copolymers: Methods, Properties, and Applications

Robertson

Zhou

et al. 2021

Macromol. Rapid Commun.

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Block copolymers (BCPs) self-assembly has continually attracted interest as a means to provide bottom-up control over nanostructures. While various methods have been demonstrated for efficiently ordering BCP nanodomains, most of them do not generically afford control of nanostructural orientation. For many applications of BCPs, such as energy storage, microelectronics, and separation membranes, alignment of nanodomains is a key requirement for enabling their practical use or enhancing materials performance. This review focuses on summarizing research progress on the development of anisotropy in BCP systems, covering a variety of topics from established aligning techniques, resultant material properties, and the associated applications. Specifically, the significance of aligning nanostructures and the anisotropic properties of BCPs is discussed and highlighted by demonstrating a few promising applications. Finally, the challenges and outlook are presented to further implement aligned BCPs into practical nanotechnological applications, where exciting opportunities exist.

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Thermal Approaches to Perpendicular Block Copolymer Microdomains in Thin Films: A Review and Appraisal

Cited by 33 publications

References 171 publications

Surface-Induced Ordering Depresses Through-Film Ionic Conductivity in Lamellar Block Copolymer Electrolytes

Surface-Induced Ordering Depresses Through-Film Ionic Conductivity in Lamellar Block Copolymer Electrolytes

3D Printing‐Enabled Nanoparticle Alignment: A Review of Mechanisms and Applications

Developing Anisotropy in Self‐Assembled Block Copolymers: Methods, Properties, and Applications

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