Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/320041
Type: Artigo de Periódico
Title: Chiral Asymmetric Structures In Aspartic Acid And Valine Crystals Assessed By Atomic Force Microscopy
Author: Teschke
O; Soares
DM
Abstract: Structures of crystallized deposits formed by the molecular self-assembly of aspartic acid and valine on silicon substrates were imaged by atomic force microscopy. Images of D- and L-aspartic acid crystal surfaces showing extended molecularly flat sheets or regions separated by single molecule thick steps are presented. Distinct orientation surfaces were imaged, which, combined with the single molecule step size, defines the geometry of the crystal. However, single molecule step growth also reveals the crystal chirality, i.e., growth orientations. The imaged ordered lattice of aspartic acid (asp) and valine (val) mostly revealed periodicities corresponding to bulk terminations, but a previously unreported molecular hexagonal lattice configuration was observed for both L-asp and L-val but not for D-asp Or D-val. Atomic force microscopy can then be used to identify the different chiral forms of aspartic acid and valine crystals.
Subject: Molecular-structure
120 K
Resolution
Morphology
Kinetics
Growth
Water
Life
Editor: AMER CHEMICAL SOC
Rights: fechado
Identifier DOI: 10.1021/acs.langmuir.6b00092
Address: http://pubs-acs-org.ez88.periodicos.capes.gov.br/doi/abs/10.1021/acs.langmuir.6b00092
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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