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题名: Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies
作者: Man, XK;  Tang, JZ;  Zhou, P;  Yan, DD;  Andelman, D
刊名: MACROMOLECULES
出版日期: 2015
卷号: 48, 期号:20, 页码:7689-7697
学科分类: Polymer Science
DOI: http://dx.doi.org/10.1021/acs.macromol.5b01362
通讯作者: Man, XK (reprint author), Beihang Univ, Ctr Soft Matter Phys & Its Applicat, Beijing 100191, Peoples R China.
文章类型: Article
英文摘要: We 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.
类目[WOS]: Polymer Science
关键词[WOS]: BLOCK-COPOLYMER ;  THIN-FILMS ;  PERPENDICULAR ORIENTATION ;  SURFACES ;  LITHOGRAPHY ;  SIMULATIONS ;  PARALLEL ;  BEHAVIOR ;  PHASES ;  PURE
收录类别: SCI
项目资助者: National Natural Science Foundation of China (NSFC) [21404003, 21434001, 21374011] ;  Ministry of Science and Technology (MOST) [2011CB808502] ;  Fundamental Research Funds for the Central Universities ;  Israel Science Foundation (ISF) [438/12] ;  United States-Israel Binational Science Foundation (BSF) [2012/060]
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/20812
Appears in Collections:理论物理所2015年知识产出_期刊论文

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Recommended Citation:
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.
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