Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies

	Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies
	Man, Xingkun 1,2; Tang, Jiuzhou 3; Zhou, Pan 5; Yan, Dadong 5; Andelman, David 4,6
刊名	MACROMOLECULES
	2015-10-27
卷号	48 期号:20 页码:7689-7697
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.
收录类别	SCI
语种	英语
公开日期	2015-12-22
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/29210]
专题	化学研究所_高分子物理与化学实验室
作者单位	1.Beihang Univ, Ctr Soft Matter Phys & Its Applicat, Beijing 100191, Peoples R China 2.Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China 3.Chinese Acad Sci, Inst Chem, Lab Polymer Phys & Chem, Beijing Natl Lab Mol Sci BNLMS, Beijing 100190, Peoples R China 4.Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China 5.Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China 6.Tel Aviv Univ, Raymond & Beverly Sackler Sch Phys & Astron, IL-69978 Tel Aviv, Israel
推荐引用方式 GB/T 7714	Man, Xingkun,Tang, Jiuzhou,Zhou, Pan,et al. Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies[J]. MACROMOLECULES,2015,48(20):7689-7697.
APA	Man, Xingkun,Tang, Jiuzhou,Zhou, Pan,Yan, Dadong,&Andelman, David.(2015).Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies.MACROMOLECULES,48(20),7689-7697.
MLA	Man, Xingkun,et al."Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies".MACROMOLECULES 48.20(2015):7689-7697.