Reversible Loading and Unloading of Nanoparticles in "Exponentially" Growing Polyelectrolyte LBL Films

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• 作者：Sudhanshu Srivastava ; Vincent Ball ; Paul Podsiadlo ; Jungwoo Lee ; Peter Ho ; Nicholas A. Kotov
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：March 26, 2008
• 年：2008
• 卷：130
• 期：12
• 页码：3748 - 3749
• 全文大小：66K
• 年卷期：v.130,no.12(March 26, 2008)
• ISSN：1520-5126

文摘

The exponentially growing layer-by-layer (LBL) films made from poly(diallyldimethylammonium chloride) (PDDA) and poly(acrylic acid) (PAA) were used to load and unload the CdTe nanoparticles (NPs). The reversible loading of NPs were investigated through UV-vis studies and further confirmed by confocal microscopy. In addition the LBL films were also compared for the release kinetics for pH 9 and 7 and films capped with (PDDA-PSS)₁₀ layers. The amount of released particles at pH 9 was found to be at least 2 orders of magnitude higher than those at pH 7 and with (PDDA-PSS)₁₀ capped layers after 25 h. This variation in film response for CdTe-particle release presents a route for studies in which highly swollen exponentially growing LBL films can be loaded with functionalized NPs for biological applications and explored as carriers to hold the NPs inside the films for self-assembly.