ITP OpenIR  > SCI期刊论文
Man, XK; Tang, JZ; Zhou, P; Yan, DD; Andelman, D; Man, XK (reprint author), Beihang Univ, Ctr Soft Matter Phys & Its Applicat, Beijing 100191, Peoples R China.
Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies
Source PublicationMACROMOLECULES
Language英语
AbstractWe present numerical calculations of lamellar phases of diblock copolymers (BC?) confined between two surfaces, where the top surface is flat and the bottom one is corrugated. The corrugated substrate is assumed to have a single q-mode of lateral undulations with a wavenumber q(s) and amplitude R. We focus on the effects of substrate roughness, parametrized by the dimensionless quantity, q(s)R, on the relative stability between parallel and perpendicular orientations of the lamellar phase. The competition between film confinement, energy cost of elastic deformation, and gain in surface energy induces a parallel-to-perpendicular transition of the BC? lamellae. Employing self-consistent field theory (SCFT), we study the critical value, (q(s)R)*, corresponding to this transition. The (q(s)R)* value increases as a function of the surface preference toward one of the two BCP components and as a function of film thickness. But, (q(s)R)* decreases with increasing values of the Flory-Huggins parameter, N chi(AB). Our findings are equivalent to stating that the critical (q(s)R)* value decreases as the BCP molecular weight or the natural BCP periodicity increases. We further show that the rough substrate can overcome the formation of parallel lamellae in cases where the top surface has a preference toward one of the two BC? components. Our results are in good agreement with previous experiments and highlight the physical conditions behind the perpendicular orientation of lamellar phases, as is desired in nanolithography and other industrial applications.
2015
Volume48Issue:20Pages:7689-7697
Subject AreaPolymer Science
DOIhttp://dx.doi.org/10.1021/acs.macromol.5b01362
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China (NSFC) [21404003, 21434001, 21374011] ; National Natural Science Foundation of China (NSFC) [21404003, 21434001, 21374011] ; National Natural Science Foundation of China (NSFC) [21404003, 21434001, 21374011] ; National Natural Science Foundation of China (NSFC) [21404003, 21434001, 21374011] ; Ministry of Science and Technology (MOST) [2011CB808502] ; Ministry of Science and Technology (MOST) [2011CB808502] ; Ministry of Science and Technology (MOST) [2011CB808502] ; Ministry of Science and Technology (MOST) [2011CB808502] ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; Israel Science Foundation (ISF) [438/12] ; Israel Science Foundation (ISF) [438/12] ; Israel Science Foundation (ISF) [438/12] ; Israel Science Foundation (ISF) [438/12] ; United States-Israel Binational Science Foundation (BSF) [2012/060] ; United States-Israel Binational Science Foundation (BSF) [2012/060] ; United States-Israel Binational Science Foundation (BSF) [2012/060] ; United States-Israel Binational Science Foundation (BSF) [2012/060]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/20812
CollectionSCI期刊论文
Corresponding AuthorMan, XK (reprint author), Beihang Univ, Ctr Soft Matter Phys & Its Applicat, Beijing 100191, Peoples R China.
Recommended Citation
GB/T 7714
Man, XK,Tang, JZ,Zhou, P,et al. Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies[J]. MACROMOLECULES,2015,48(20):7689-7697.
APA Man, XK,Tang, JZ,Zhou, P,Yan, DD,Andelman, D,&Man, XK .(2015).Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies.MACROMOLECULES,48(20),7689-7697.
MLA Man, XK,et al."Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies".MACROMOLECULES 48.20(2015):7689-7697.
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