title: Plasma coagulation response to surfaces with nanoscale chemical heterogeneity.
abstract: A mixed film bearing nanoscale domains of one chemical functionality surrounded by another chemical functionality is shown to prolong material-induced coagulation of whole human blood plasma. In comparison, surfaces with uniform silane chemistry or physical mixtures of control surfaces bearing two different, uniform silane chemistries are found to be much more efficient activators of plasma coagulation on a per-unit-area basis. Binary mixed films are deposited on glass substrates by the sequential adsorption of 0.0001% 3-aminopropyltriethoxysilane (APS) followed by 0.1% n-butyltrichlorosilane (BTS). Creation of APS islands in a sea of BTS is confirmed by atomic force microscopy in friction mode. Results suggest that some yet-to-be-determined interfacial phenomena, perhaps associated with protein adsorption near the interface, may be altered by this nanoscale spatially distributed chemical heterogeneity, causing a decrease in contact activation.
authors: Department of Surgery, Biomedical Engineering Institute, Pennsylvania State University College of Medicine, The Milton S. Hershey Medical Center, H151, 500 University Drive, Hershey, PA 17033, USA.
authors: Rachel
authors: R
authors: Miller
authors: Zhe
authors: Z
authors: Guo
authors: Erwin A
authors: EA
authors: Vogler
authors: Christopher A
authors: CA
authors: Siedlecki
mesh_terms: D001777:Blood Coagulation / Q000502:physiology*; D020099:Coated Materials, Biocompatible / Q000378:metabolism*; D006801:Humans; D018625:Microscopy, Atomic Force; D008962:Models, Theoretical; D010949:Plasma / Q000378:metabolism*; D012821:Silanes / Q000737:chemistry; D013499:Surface Properties
chemical_list: D020099:Coated Materials, Biocompatible; D012821:Silanes