Control of Orientational Order in Block Copolymer Thin Films by Electric Fields: A Combinatorial Approach

Olszowka, Violetta; Kuntermann, Volker; Böker, Alexander

doi:10.1021/ma800848b

Cited by 28 publications

(31 citation statements)

References 23 publications

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“…This can be seen in Fig. 2a, which shows SFM images of a thin S 47 H 10 M 43 82 film annealed for [20]. Copyright 2008 American Chemical Society 6.5 h in saturated toluene vapor at a position between the gradient electrodes with an electric field strength of 2.5 V/μm.…”

Section: Control Of Orientational Order In Thin Filmsmentioning

confidence: 87%

“…The error of P 2 due to inhomogeneities in the film and the phase contrast can be estimated to be about ±0.02. Reprinted with permission from Macromolecules [20]. Copyright 2008 American Chemical Society did not improve the orientational order significantly.…”

Section: Control Of Orientational Order In Thin Filmsmentioning

confidence: 99%

“…In addition, according to the larger dielectric contrast between the blocks in S 50 V 50 78 compared to S 47 H 10 M 43 82 , the gain in free energy and thus the electrodynamic driving force is about an order of magnitude larger for the PVP-based block copolymer. Figure 4 shows a series of SFM phase images of a 745 ± 2 − nm thick S 50 V 50 78 film after [20]. Copyright 2008 American Chemical Society 20 h of annealing with saturated toluene vapor under a gradient electric field.…”

Section: Control Of Orientational Order In Thin Filmsmentioning

confidence: 99%

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Effects of Electric Fields on Block Copolymer Nanostructures

Schoberth

Olszowka

Schmidt

et al. 2010

Advances in Polymer Science

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In this chapter we overview electric-field-induced effects on block copolymer microdomains. First, we will consider the thin film behavior and elucidate the parameters governing electric-field-induced alignment. We describe the structural evolution of the alignment in an electric field via quasi in situ scanning force microscopy (SFM) using a newly developed SFM setup that allows solvent vapor treatment in the presence of high electric fields. Second, we will turn to bulk structures and show novel effects of high field strengths on the block copolymer phase behavior. We will describe a procedure that allows tuning the morphology and size of the nanoscopic patterns by application of high electric fields and present experimental evidence for the electric-field-induced decrease of the order-disorder transition temperature in a block copolymer.

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Section: Control Of Orientational Order In Thin Filmsmentioning

confidence: 87%

Section: Control Of Orientational Order In Thin Filmsmentioning

confidence: 99%

Section: Control Of Orientational Order In Thin Filmsmentioning

confidence: 99%

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Effects of Electric Fields on Block Copolymer Nanostructures

Schoberth

Olszowka

Schmidt

et al. 2010

Advances in Polymer Science

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“…A similar BCP with a short poly(hydroxyethyl methacrylate) (PHEMA) block as linker (PS-b -PHEMA-b -PMMA) that forms upstanding lamellae in thin fi lms, was shown to align above E c = 5.2 V μ m − 1 during solvent vapor annealing. [ 73 ] Mansky et al showed that by using an interdigitated electrode design, inplane alignment can be scaled up to the range of several centimeters. [ 68 ] By placing the capacitor setup directly in an atomic force microscope and applying the electric fi eld at the place of measurement, Olszowka et al observed the alignment mechanism of PS-b -PHEMA-b -PMMA lamellae quasi in situ .…”

Section: Block Copolymer Films In a Capacitor Analogymentioning

confidence: 99%

Beyond Orientation: The Impact of Electric Fields on Block Copolymers

Liedel

Pester

Ruppel

et al. 2011

Macro Chemistry & Physics

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Since the fi rst report on electric fi eld-induced alignment of block copolymers (BCPs) in 1991, electric fi elds have been shown not only to direct the orientation of BCP nanostructures in bulk, solution, and thin fi lms, but also to reversibly induce order-order transitions, affect the order-disorder transition temperature, and control morphologies' dimensions with nanometer precision. Theoretical and experimental results of the past years in this very interesting fi eld of research are summarized and future perspectives are outlined. C. Liedel , C. W. Pester , A. Böker Lehrstuhl für Makromolekulare Materialien und Oberfl ächen, DWI an der RWTH Aachen e.Clemens Liedel studied chemistry and macromolecular science (in the framework of the Elite Network of Bavaria) at Bayreuth University and recieved his diplomas in 2008 and 2010, respectively. Since 2008, he has been working on his Ph.D. degree in Bayreuth and Aachen in the group of Prof. A. Böker with an included research period at the University of California Santa Barbara (UCSB) in the group of Prof. E. J. Kramer. The topic of his current work is block copolymers and composite materials in thin fi lms exposed to electric fi elds. Christian W. Pester received his diploma in polymer and colloidal chemistry from Bayreuth University in 2009. The topic of his diploma thesis was electric-fi eld induced alterations of domain spacings. He then entered RWTH Aachen University and is pursuing his Ph.D. degree under the supervision of Prof. A. Böker. His current research interest focuses on the study of block copolymers in electric fi elds by small-angle scattering methods. Alexander Böker is a Full Professor at RWTH Aachen University for Macromolecular Materials and Surfaces and Co-Director of the DWI an der RWTH Aachen e.V. He studied chemistry at Cornell University and the University of Mainz, Germany, where he received his diploma in chemistry in 1999. In 2002, he completed his Ph.D. in physical and macromolecular chemistry at the University of Bayreuth. From 2002 to 2004, he worked with Thomas P. Russell at the University of Massachusetts, Amherst. His main research interests include guided self-assembly of block copolymer and nanoparticle systems, and their control via external fi elds.

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“…15 Routes to APPS include physical or chemical modification of surfaces. Physical methods normally include procedures involving electrical fields, [16][17][18][19] self-assembly of nanoparticles, [20][21][22][23][24][25] interfacial instabilities, [26][27][28][29][30] soft lithography, [31][32][33][34] etc. On the other hand, chemical approaches are mainly achieved by chemically grafting responsive self-assembled monolayers (SAMs) or polymer brushes onto surfaces to obtain responsive wettability and conductivity, etc.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating

Zhou¹,

Huang²,

Sun³

et al. 2017

ACS Appl. Mater. Interfaces

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Patterned porous surfaces with responsive functionalities are fabricated by a thermoresponsive microgel-assisted breath figure (BF) process. When water droplets submerge into a polystyrene (PS) solution during formation of a porous surface by the bottom-up BF process, poly(N-isopropylacrylamide)-co-acrylic acid (PNIPAm-co-AA) microgels dispersed in the solution spontaneously assemble at the water–organic interfaces like “Pickering emulsions”, reinforced by capillary flow. The conformal layer of PNIPAm-co-AA microgels lining the pores appears in images from a scanning electron microscope (SEM) either as a smooth surface layer (L) or as an array of domelike protrusions (D), depending on the conditions at which the sample was dried for SEM. The change between L and D morphology correlates with the volume phase transition behavior of the microgels freely suspended: drying at a temperature below the volume phase transition temperature (VPTT) gives L, and the D morphology is formed by drying at a temperature greater than the VPTT of PNIPAm-co-AA microgels. The morphological transition is shown to accompany a significant change in surface contact angle (CA) relative to a corresponding pore layer made of PS, with L having a CA that is reduced by 85° relative to PS, while the decrease is only 22° for D. Porous structures with morphologically responsive surfaces could find application in biocatalysis or tissue engineering, for example, with functional enzymes sequestered when microgels are collaped and accessible when the microgels are swollen.

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Control of Orientational Order in Block Copolymer Thin Films by Electric Fields: A Combinatorial Approach

Cited by 28 publications

References 23 publications

Effects of Electric Fields on Block Copolymer Nanostructures

Effects of Electric Fields on Block Copolymer Nanostructures

Beyond Orientation: The Impact of Electric Fields on Block Copolymers

Fabrication of Active Surfaces with Metastable Microgel Layers Formed during Breath Figure Templating

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