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Although it is well known that the amazing iridescent colors from the cuticle of beetles reflect intricate nanoscale organization of bio-fibers, artificial inorganic materials with comparable optical response have not yet been synthesized with abiotic nano-building blocks. Such materials have broad applications including circular polarizers, circularly polarized luminescence, lasers, etc. Here, we describe a general method to fabricate biomimetic chiral photonic crystals via Langmuir-Schaefer assembly of colloidal inorganic nanowires. We not only reproduce the intricate helical structure and circularly polarized color reflection in beetles, but also acquire the highest chiroptical activity with a dissymmetry factor of -1.6 among the chiral inorganic nanostructures. More importantly, beyond nature, programmable structural control based on the precise interlayer arrangement endows us an unprecedented freedom to manipulate the optical activity of as-fabricated chiral photonic crystals.
This article was published in the following journal.
Name: Angewandte Chemie (International ed. in English)
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Polymers of N-SUBSTITUTED GLYCINES containing chiral centers at the a-position of their side chains. These oligomers lack HYDROGEN BONDING donors, preventing formation of the usual intrachain hydrogen bonds but can form helices driven by the steric influence of chiral side chains.
Enzymes that catalyze the epimerization of chiral centers within carbohydrates or their derivatives. EC 5.1.3.
Materials fabricated by BIOMIMETICS techniques, i.e., based on natural processes found in biological systems.
An interdisciplinary field in materials science, ENGINEERING, and BIOLOGY, studying the use of biological principles for synthesis or fabrication of BIOMIMETIC MATERIALS.
Enzymes that catalyze either the racemization or epimerization of chiral centers within amino acids or derivatives. EC 5.1.1.