Accession Number : ADA570955


Title :   Thin Film Assembly of Spider Silk-like Block Copolymers


Descriptive Note : Journal article


Corporate Author : GEORGIA INST OF TECH ATLANTA SCHOOL OF MATERIALS SCIENCE AND ENGINEERING


Personal Author(s) : Krishnaji, Sreevidhya T ; Huang, Wenwen ; Rabotyagova, Olena ; Kharlampieva, Eugenia ; Choi, Ikjun ; Tsukruk, Vladimir V ; Naik, Rajesh ; Cebe, Peggy ; Kaplan, David L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a570955.pdf


Report Date : Jan 2011


Pagination or Media Count : 10


Abstract : We report the self-assembly of monolayers of spider silk-like block copolymers. Langmuir isotherms were obtained for a series of bioengineered variants of the spider silks, and stable monolayers were generated. Langmuir-Blodgett films were prepared by transferring the monolayers onto silica substrates and were subsequently analyzed by atomic force microscopy (AFM). Static contact angle measurements were performed to characterize interactions across the interface (thin film, water, air), and molecular modeling was used to predict 3D conformation of spider silk-like block copolymers. The influence of molecular architecture and volume fraction of the proteins on the self-assembly process was assessed. At high surface pressure, spider silk-like block copolymers with minimal hydrophobic block (fA=12%) formed oblate structures, whereas block copolymer with a 6-fold larger hydrophobic domain (fA=46%) formed prolate structures. The varied morphologies obtained with increased hydrophobicity offer new options for biomaterials for coatings and related options. The design and use of bioengineered protein block copolymers assembled at air-water interfaces provides a promising approach to compare 2D microstructures and molecular architectures of these amphiphiles, leading to more rationale designs for a range of nanoengineered biomaterial needs as well as providing a basis of comparison to more traditional synthetic block copolymer systems.


Descriptors :   *BLOCK COPOLYMERS , ARCHITECTURE , ASSEMBLY , COMPARISON , HIGH PRESSURE , HYDROPHOBIC PROPERTIES , INTERACTIONS , LAYERS , MEASUREMENT , MODELS , MOLECULES , MORPHOLOGY , PRESSURE , PROTEINS , REPRINTS , SILICON DIOXIDE , STABILITY , STATICS , SUBSTRATES , SURFACE PROPERTIES , THIN FILMS , VARIATIONS


Subject Categories : Polymer Chemistry


Distribution Statement : APPROVED FOR PUBLIC RELEASE