共查询到20条相似文献,搜索用时 15 毫秒
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Self‐Assembly: Thermoreversible Morphology and Conductivity of a Conjugated Polymer Network Embedded in Block Copolymer Self‐Assemblies (Small 35/2016) 下载免费PDF全文
Youngkyu Han Jan‐Michael Y. Carrillo Zhe Zhang Yunchao Li Kunlun Hong Bobby G. Sumpter Michael Ohl Mariappan Parans Paranthaman Gregory S. Smith Changwoo Do 《Small (Weinheim an der Bergstrasse, Germany)》2016,12(35):4775-4775
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Thermoreversible Self‐Assembly of Perfluorinated Core‐Coronas Cellulose‐Nanoparticles in Dry State 下载免费PDF全文
Yonggui Wang Pedro B. Groszewicz Sabine Rosenfeldt Hendrik Schmidt Cynthia A. Volkert Philipp Vana Torsten Gutmann Gerd Buntkowsky Kai Zhang 《Advanced materials (Deerfield Beach, Fla.)》2017,29(43)
Self‐assembly of nanoparticles (NPs) forming unique structures has been investigated extensively over the past few years. However, many self‐assembled structures by NPs are irreversible, because they are generally constructed using their suspensions. It is still challenging for NPs to reversibly self‐assemble in dry state, let alone of polymeric NPs with general sizes of hundreds of nm. Herein, this study reports a new reversible self‐assembly phenomenon of NPs in dry state, forming thermoreversible strip‐like supermolecular structures. These novel NPs of around 150 nm are perfluorinated surface‐undecenoated cellulose nanoparticles (FSU‐CNPs) with a core‐coronas structure. The thermoreversible self‐assembled structure is formed after drying in the air at the interface between FSU‐CNP films and Teflon substrates. Remarkably, the formation and dissociation of this assembled structure are accompanied by a reversible conversion of the surface hydrophobicity, film transparency, and anisotropic properties. These findings show novel feasibility of reversible self‐assembly of NPs in dry state, and thereby expand our knowledge of self‐assembly phenomenon. 相似文献
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This review discusses the potential of block copolymer type macromolecular building blocks for the preparation of self‐assembled materials. Three different classes of block copolymer type architectures will be distinguished: (i) coil–coil diblock copolymers, (ii) rod–coil diblock copolymers, and (iii) rod–coil diblock oligomers. The basic principles that underlie the self‐assembly of each of these different building blocks will be discussed. These theoretical considerations are complemented with examples from recent literature that illustrate the potential of the different types of block copolymers to prepare (functional) supramolecular materials. Finally, several strategies will be presented that could allow the preparation of stimuli‐sensitive self‐assembled materials, i.e., materials whose properties can be reversibly manipulated under the action of appropriate external stimuli. 相似文献
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Ji Xu Thomas P. Russell Antonio Checco 《Small (Weinheim an der Bergstrasse, Germany)》2013,9(5):779-784
The self‐assembly of cylinder‐forming block copolymer (BCP) microdomains confined within chemical stripe patterns of widths incommensurate with the natural period of the copolymers, L0, is studied. It is shown that this incommensurability causes changes in both the shapes of the microdomains and their spatial period. Specifically, a transition from n to n + 1 rows of microdomains is observed when the stripe width is about n ± 1/2 L0. When the stripe's width is comparable to L0, ellipticity of microdomains can be induced with an aspect ratio up to 2.2. Free energy models are applied to describe the energetic origin of such behavior. Although our observations qualitatively resemble results in sphere‐forming BCPs confined in topographical trenches, the quantitative difference is noteworthy and technologically important for the design of nanostructures with programmable shapes. 相似文献
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Amir Tavakkoli K. G. Samuel M. Nicaise Adam F. Hannon Kevin W. Gotrik Alfredo Alexander‐Katz Caroline A. Ross Karl K. Berggren 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(3):493-499
A sacrificial‐post templating method is presented for directing block copolymer self‐assembly to form nanostructures consisting of monolayers and bilayers of microdomains. In this approach, the topographical post template is removed after self‐assembly and therefore is not incorporated into the final microdomain pattern. Arrays of nanoscale holes of different shapes and symmetries, including mesh structures and perforated lamellae with a bimodal pore size distribution, are produced. The ratio of the pore sizes in the bimodal distributions can be varied via the template pitch, and agrees with predictions of self consistent field theory. 相似文献
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Thermally Switchable Aligned Nanopores by Magnetic‐Field Directed Self‐Assembly of Block Copolymers 下载免费PDF全文
Manesh Gopinadhan Prashant Deshmukh Youngwoo Choo Pawel W. Majewski Olgica Bakajin Menachem Elimelech Rajeswari M. Kasi Chinedum O. Osuji 《Advanced materials (Deerfield Beach, Fla.)》2014,26(30):5148-5154
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Bong Hoon Kim Kyeong‐Jae Byeon Ju Young Kim Jinseung Kim Hyeong Min Jin Joong‐Yeon Cho Seong‐Jun Jeong Jonghwa Shin Heon Lee Sang Ouk Kim 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(20):4207-4212
Negative‐tone block copolymer (BCP) lithography based on in situ surface chemical modification is introduced as a highly efficient, versatile self‐assembled nanopatterning. BCP blends films consisting of end‐functionalized low molecular weight poly(styrene‐ran‐methyl methacrylate) and polystyrene‐block‐Poly(methyl methacylate) can produce surface vertical BCP nanodomains on various substrates without prior surface chemical treatment. Simple oxygen plasma treatment is employed to activate surface functional group formation at various substrates, where the end‐functionalized polymers can be covalently bonded during the thermal annealing of BCP thin films. The covalently bonded brush layer mediates neutral interfacial condition for vertical BCP nanodomain alignment. This straightforward approach for high aspect ratio, vertical self‐assembled nanodomain formation facilitates single step, site‐specific BCP nanopatterning widely useful for various substrates. Moreover, this approach is compatible with directed self‐assembly approaches to produce device oriented laterally ordered nanopatterns. 相似文献
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High Conductivity in Molecularly p‐Doped Diketopyrrolopyrrole‐Based Polymer: The Impact of a High Dopant Strength and Good Structural Order 下载免费PDF全文
Yevhen Karpov Tim Erdmann Ivan Raguzin Mahmoud Al‐Hussein Marcus Binner Uwe Lappan Manfred Stamm Kirill L. Gerasimov Tetyana Beryozkina Vasiliy Bakulev Denis V. Anokhin Dimitri A. Ivanov Florian Günther Sibylle Gemming Gotthard Seifert Brigitte Voit Riccardo Di Pietro Anton Kiriy 《Advanced materials (Deerfield Beach, Fla.)》2016,28(28):6003-6010
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Laterally Ordered Sub‐10 nm Features Obtained From Directed Self‐Assembly of Si‐Containing Block Copolymer Thin Films 下载免费PDF全文
Yecheol Rho Karim Aissou Muhammad Mumtaz Wonsang Kwon Gilles Pécastaings Cristian Mocuta Stefan Stanecu Eric Cloutet Cyril Brochon Guillaume Fleury Georges Hadziioannou 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(48):6377-6383