Lamellar Diblock Copolymers on Rough Substrates: Self-Consistent Field Theory Studies
文献类型：期刊论文
| 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 |
| 通讯作者 | Man, XK (reprint author), Beihang Univ, Ctr Soft Matter Phys & Its Applicat, Beijing 100191, Peoples R China. |
| 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. |
| 学科主题 | Polymer Science |
| 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 |
| 语种 | 英语 |
| 源URL | [http://ir.itp.ac.cn/handle/311006/20812]  |
| 专题 | 理论物理研究所_理论物理所1978-2010年知识产出 |
| 推荐引用方式 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.(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. |
入库方式： OAI收割
来源：理论物理研究所
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