콜로이드 및 분자조립 부문위원회 II: 콜로이드 및 분자 조립의 기본 원리 재조명과 혁신적 제조 패러다임 (2)
[2O7-1]
Sequence-Programmed Assembly Rules Govern Metastable Energy Basins and Chiroptical Readout in Near-Rigid 13-Particle Colloidal Clusters
발표자이동규 (한국과학기술원)
연구책임자염지현 (한국과학기술원)
Abstract
We investigate near-rigid 13-particle clusters (one center + twelve surface particles) under fixed-distance constraints, relevant to ligand/polymer-mediated assembly where center–surface separations are effectively prescribed. Within the Gregory–Newton framework, we enumerate a canonical set of GN-compatible pseudo-icosahedral states generated by serial face-capping (polytetrahedral) growth and map minimum-energy pathways (MEPs) among states and toward close-packed cuboctahedral (FCC/HCP) endpoints. A symmetry-corrected entropic constant
C_S = ln(Ω/|G|) rationalizes why icosahedral shells can be statistically favored for closed N=13 clusters, whereas FCC/HCP dominates in bulk due to space-filling constraints. Electromagnetic modes and circular dichroism computed along MEPs reveal low-barrier chirality-preserving vs chirality-inverting routes, providing a design grammar for energy-lean chiral switching with optical readout.