[PDF] Directed Self Assembly Of Block Copolymers For High Breakdown Strength Polymer Film Capacitors eBook

Author :
Publisher :
Page : 11 pages
File Size : 38,73 MB
Release : 2016
Category :
ISBN :

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Emerging needs for fast charge/discharge yet high-power, lightweight, and flexible electronics requires the use of polymer-film-based solid-state capacitors with high energy densities. Fast charge/discharge rates of film capacitors on the order of microseconds are not achievable with slower charging conventional batteries, supercapacitors and related hybrid technologies. However, the current energy densities of polymer film capacitors fall short of rising demand, and could be significantly enhanced by increasing the breakdown strength (EBD) and dielectric permittivity ([epsilon]r) of the polymer films. Co-extruded two-homopolymer component multilayered films have demonstrated much promise in this regard showing higher EBD over that of component polymers. Multilayered films can also help incorporate functional features besides energy storage, such as enhanced optical, mechanical, thermal and barrier properties. In this work, we report accomplishing multilayer, multicomponent block copolymer dielectric films (BCDF) with soft-shear driven highly oriented self-assembled lamellar diblock copolymers (BCP) as a novel application of this important class of self-assembling materials. Results of a model PS-b-PMMA system show ~50% enhancement in EBD of self-assembled multilayer lamellar BCP films compared to unordered as-cast films, indicating that the breakdown is highly sensitive to the nanostructure of the BCP. The enhancement in EBD is attributed to the "barrier effect", where the multiple interfaces between the lamellae block components act as barriers to the dielectric breakdown through the film. The increase in EBD corresponds to more than doubling the energy storage capacity using a straightforward directed self-assembly strategy. Lastly, this approach opens a new nanomaterial paradigm for designing high energy density dielectric materials.

Author :
Publisher : World Scientific
Page : 1885 pages
File Size : 46,16 MB
Release : 2020-06-24
Category : Science
ISBN : 9811218072

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This book is indexed in Chemical Abstracts ServiceSoft and bio-nanomaterials offer a tremendously rich behavior due to the diversity and tailorability of their structures. Built from polymers, nanoparticles, small and large molecules, peptoids and other nanoscale building blocks, such materials exhibit exciting functions, either intrinsically or through the engineering of their organization and combination of blocks. Thus, it is not surprising that a variety of challenges, for example, in energy storage, environment protection, advanced manufacturing, purification and healthcare, can be addressed using these materials. The recent advances in understanding the behavior of soft matter and biomaterials are being actively translated into functional materials systems and devices, which take advantages of newly discovered and specifically created morphologies with desired properties. This major reference work presents a detailed overview of recent research developments on fundamental and application-inspired aspects of soft and bio-nanomaterials and their emerging functions, and will be divided into four volumes: Vol 1: Soft Matter under Geometrical Confinement: From Fundamentals at Planar Surfaces and Interfaces to Functionalities of Nanoporous Materials; Vol 2: Polymers on the Nanoscale: Nano-structured Polymers and Their Applications; Vol 3: Bio-Inspired Nanomaterials: Nanomaterials Built from Biomolecules and Using Bio-derived Principles; Vol 4: Nanomedicine: Nanoscale Materials in Nano/Bio Medicine.

Author : Srikanta Moharana
Publisher : Springer Nature
Page : 442 pages
File Size : 14,3 MB
Release : 2023-10-30
Category : Science
ISBN : 3031409388

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This contributed volume presents multiple techniques for the synthesis of nanodielectric materials and their composites and examines their applications in the field of energy storage. It overviews various methods for designing these materials and analyses their properties such as mechanical strength, flexibility, dielectric as well as electrical performances for end-user applications such as thin-film flexible capacitors, advanced energy storage capacitors, and supercapacitors. The book gives a special focus on examining the dielectric properties of polymer-based nanomaterials, core-shell structured nanomaterials, and graphene-based polymeric composites among others, and explains the importance of their use in the aforementioned energy storage applications. It provides a great platform for understanding and expanding technological solutions needed for global energy challenges and it is of great benefit to industry professionals, academic researchers, material scientists, engineers, graduate students, physicists, and chemists working in the area of nanodielectrics.

Author : Nathanael Lap-Yan Wu
Publisher :
Page : 185 pages
File Size : 30,3 MB
Release : 2014
Category : Block copolymers
ISBN :

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The impressive developments in the semiconductor industry over the past five decades have largely been dependent on the ability to continually reduce the dimensions of devices on a chip. However, as critical dimension requirements for these devices approach the limits of photolithography, new fabrication strategies must be introduced for these remarkable advances to continue. One technology listed by the International Technology Roadmap for Semiconductors as a candidate for next-generation nanostructure fabrication is the directed self-assembly of block copolymers. Block copolymers have received significant attention of late for their ability to template large regular arrays of nanostructures with dimensions ranging from 10 to 50 nm. The production of denser sub-10 nm nanostructures is also possible by reducing the size of these polymers, but a reduction of the polymer size also compromises the quality of nanostructures, making small polymers extremely difficult to use. In this thesis, two different patterning approaches are introduced to push the nanostructure density limits possible for a given polymer. In the first, a novel patterning approach involving thin films of bilayer block copolymer domains is used to effectively double the nanostructure density patterned by a given polymer. The technique is successfully applied to different types and sizes of polymer, and can also form highly controlled arrays of patterns with the help of surface topography. By varying different process parameters during the self-assembly or subsequent plasma steps, the dimensions of these density-doubled patterns may be finely-tuned to the desired width and pitch. The surface coverage of these density-doubled nanostructures is also maximized through adjusting the film thickness and parameters in the self-assembly process. Besides using bilayer films, dense arrays of nanostructures may also be patterned using a multi-step patterning approach. In this approach, multiple layers of block copolymer films are subsequently deposited onto the substrate to template nanostructures. Because nanostructures from previous layers contribute to the surface topography, they influence the self-assembly of successive layers and more dense and complex patterns may be produced as a result.

Author : P. Alexandridis
Publisher : Elsevier
Page : 449 pages
File Size : 16,79 MB
Release : 2000-10-18
Category : Science
ISBN : 0080527108

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It is the belief of the editors of this book that the recognition of block copolymers as being amphiphilic molecules and sharing common features with other well-studied amphiphiles will prove beneficial to both the surfactant and the polymer communities. An aim of this book is to bridge the two communities and cross-fertilise the different fields. To this end, leading researchers in the field of amphiphilic block copolymer self-assembly, some having a background in surfactant chemistry, and others with polymer physics roots, have agreed to join forces and contribute to this book.The book consists of four entities. The first part discusses theoretical considerations behind the block copolymer self-assembly in solution and in the melt. The second part provides case studies of self-assembly in different classes of block copolymers (e.g., polyethers, polyelectrolytes) and in different environments (e.g., in water, in non-aqueous solvents, or in the absence of solvents). The third part presents experimental tools, ranging from static (e.g., small angle neutron scattering) to dynamic (e.g., rheology), which can prove valuable in the characterization of block copolymer self-assemblies. The fourth part offers a sampling of current applications of block copolymers in, e.g., formulations, pharmaceutics, and separations, applications which are based on the unique self-assembly properties of block copolymers.

Author : Ian W. Hamley
Publisher : John Wiley & Sons
Page : 312 pages
File Size : 44,34 MB
Release : 2005-09-02
Category : Science
ISBN :

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This unique text discusses the solution self-assembly of block copolymers and covers all aspects from basic physical chemistry to applications in soft nanotechnology. Recent advances have enabled the preparation of new materials with novel self-assembling structures, functionality and responsiveness and there have also been concomitant advances in theory and modelling. The present text covers the principles of self-assembly in both dilute and concentrated solution, for example micellization and mesophase formation, etc., in chapters 2 and 3 respectively. Chapter 4 covers polyelectrolyte block copolymers - these materials are attracting significant attention from researchers and a solid basis for understanding their physical chemistry is emerging, and this is discussed. The next chapter discusses adsorption of block copolymers from solution at liquid and solid interfaces. The concluding chapter presents a discussion of selected applications, focussing on several important new concepts. The book is aimed at researchers in polymer science as well as industrial scientists involved in the polymer and coatings industries. It will also be of interest to scientists working in soft matter self-assembly and self-organizing polymers.

Author : Gabriela Alva
Publisher :
Page : 78 pages
File Size : 14,38 MB
Release : 2016
Category : Block copolymers
ISBN :

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High-{1D7C0} block copolymers (BCP) have gained interest to be used as an alternative to currently used multiple patterning techniques for obtaining sub-lithographic features due to their ability to self-assemble at the nanoscale. However, there is a challenge in controlling the orientation of high-{1D7C0} BCPs at the air interface. This work describes the use of a formulation-based approach wherein different surface active polymers (SAP) were added as additives to control the orientation of poly(styrene-b-methyl carbonate) (PS-b-PMeCAR) lamellae at the air interface. The resulting thin films made from these formulations showed successful formation of perpendicular lamellae on neutral underlayer substrates upon thermal annealing. The higher surface active SAP demonstrated better orientation control with lower loadings and on thicker films. These films were characterized by atomic force microscopy, grazing incidence small angle x-ray spectroscopy, and x-ray photoelectron spectroscopy to confirm the perpendicular orientation of the lamellar domains and the distribution of the SAP in the BCP thin film. The vertically oriented BCP domains were used as an etch mask by selectively removing the more etch labile PMeCAR block by reactive ion etching using oxygen plasma. A technique called sequential infiltration synthesis (SIS), followed by removing the PS block to obtain ~9.5 nm half pitch domains, was also used. Directed self-assembly via graphoepitaxy was also successfully demonstrated. Future work includes investigation of different BCP platforms and morphologies other than lamellae for patterning work.

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Publisher :
Page : 97 pages
File Size : 46,71 MB
Release : 2014
Category :
ISBN : 9781303817588

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In Chapter 4, the alignment of block copolymer domains in tapered width channels has been studied. Confined polymer chains undergo elastic deformation to satisfy the channel width constraint and narrow end of the channel imparts a stronger directing field on the alignment of block copolymer domains.