Aleuritic (9,10,16-trihydroxypalmitic) acid self-assembly on mica.
Aleuritic (9,10,16-trihydroxypalmitic) acid self-assembly on mica from solution has been studied using AFM, ATR-FTIR and MD simulations. The goal of this study is to define the role of hydroxyl groups in the interaction between molecules as reference data to understand the mechanism of formation of synthetic and natural biopolyesters from polyhydroxylated long chain carboxylic acids. In a confined structure, such as the one imposed by a vertically self-assembled layer on mica, aleuritic acid has a tendency to adopt a monolayer configuration ruled by the lateral interactions between molecules via the two secondary hydroxyl groups. This (2D) growth competes with the multilayer formation (3D), which is conditioned by the terminal primary hydroxyl group. As the self-assembly spatial constraint is relaxed, MD has shown that the structure tends to become an amorphous and crosslinked phase that can be characterized by topographic and friction force AFM data.
Heredia-Guerrero
José Alejandro
JA
Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-Universidad de Sevilla, Avda, Americo Vespuccio, 49 (41092)-Sevilla, Spain.
San-Miguel
Miguel Angel
MA
Sansom
Mark S P
MS
Heredia
Antonio
A
Benítez
José Jesús
JJ
D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry*; D004951:Esterification; D006878:Hydroxides / Q000737:chemistry; D008968:Molecular Conformation; D056004:Molecular Dynamics Simulation; D010169:Palmitic Acids / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared
D000538:Aluminum Silicates; D006878:Hydroxides; D010169:Palmitic Acids; C059860:aleuritolic acid; C031356:hydroxide ion; C011934:mica