News Column

Study Findings from University of Pennsylvania Provide New Insights into Nanoparticles

June 27, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Nanoparticles. According to news originating from Philadelphia, Pennsylvania, by NewsRx correspondents, research stated, "Layer-by-layer (LbL) deposition using primarily inorganic silica nanoparticles is employed for surface modification of polymeric micro- and ultrafiltration (MF/UF) membranes to produce novel thin film composite (TFC) membranes intended for nanofiltration (NF) and reverse osmosis (RO) applications. A wide variety of porous substrate membranes with different surface characteristics are successfully employed."

Our news journalists obtained a quote from the research from the University of Pennsylvania, "This report gives detailed results for polycarbonate track etched (PCTE), polyethersulfone (PES), and sulfonated PES (SPEES) MF/UF substrates. Both spherical (cationic/anionic) and eccentric elongated (anionic) silica nanoparticles are deposited using conditions similar to those in prior works for solid substrates (e.g., Lee et al.(1)). Appropriate selection of the pH for anionic and cationic particle deposition enables construction of nanoparticle-only layers 100-1200 nm in thickness atop the original porous membrane substrates. The surface layer thickness appears to vary linearly with the number of bilayers deposited, i.e., with the number of anionic/cationic deposition cycles. The deposition process is optimized to eliminate drying-induced cracking and improve mechanical durability via thickness control and postdeposition hydrothermal treatment. 'Dead-end' permeation tests using dextran standards reveal the hydraulic characteristics and separations capability for the PCTE-based TFC membranes."

According to the news editors, the research concluded: "The results show that nanoparticle-based LbL surface modification of MF and UF rated media can produce TFC membranes with NF capabilities."

For more information on this research see: All-Nanoparticle Layer-by-Layer Surface Modification of Micro- and Ultrafiltration Membranes. Langmuir, 2014;30(19):5545-5556. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Langmuir -

The news correspondents report that additional information may be obtained from L. Escobar-Ferrand, University of Pennsylvania, Dept. of Chem & Biomol Engn, Philadelphia, PA 19104, United States. Additional authors for this research include D.Y. Li, D. Lee and C.J. Durning (see also Nanoparticles).

Keywords for this news article include: Philadelphia, Pennsylvania, United States, Nanotechnology, Emerging Technologies, North and Central America

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Source: Science Letter

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