کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
613126 | 880715 | 2007 | 10 صفحه PDF | دانلود رایگان |
Ultrathin films containing dendrimers are fabricated on amine- and anhydride-derivatized silicon dioxide surface through alternate layer-by-layer (LbL) assembly of pyromellitic dianhydride (PMDA) and poly(amidoamine) (PAMAM) dendrimer in supercritical carbon dioxide (SCCO2) with interlayer linkage established by covalent bonds. X-ray photoelectron and UV-visible absorption spectroscopies, atomic force microscopy (AFM), and ellipsometry were employed to study the interfacial chemistry, growth, morphology, and thickness of the assembled film. XPS analysis suggests that the PMDA/PAMAM interlayer covalent bond is established to completion, and functional surfaces for immobilization of the next layer are available after deposition of each layer. UV-visible absorption and ellipsometry revealed layer-by-layer growth of the film. The functional property film as a porous matrix was manifested in the reduction of the refractive index upon introduction of the dendrimer.
Schematic of layer-by-layer molecular assembly of poly(amido amine) dendrimer on an anhydride-derivatized silicon substrate with interlayer covalent bonds, formed using supercritical carbon dioxide as the processing medium.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 306, Issue 1, 1 February 2007, Pages 118–127