News Column

Recent Research from Institute of Materials Highlight Findings in Nanoparticles

February 28, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators discuss new findings in Nanoparticles. According to news reporting originating in Lausanne, Switzerland, by NewsRx journalists, research stated, "Surface heterogeneity plays an important role in controlling colloidal phenomena. This study investigated the self-aggregation and bacterial adsorption of self-assembled monolayer coated gold nanoparticles (AuNPs) with different surface compositional and structural heterogeneity."

The news reporters obtained a quote from the research from the Institute of Materials, "Evaluation was performed on AuNPs coated with (1) one ligand with charged terminals (MUS), (2) two homogeneously distributed ligands with respectively charged. and nonpolar terminals (brOT) and (3) two ligands with respectively charged and nonpolar terminals with stripe-like distribution (OT). The brOT particles have less negative electrophoretic mobility (EPM) values, smaller critical coagulation concentration (CCC) and larger adsorption rate on Escherichia coli than that of AuNPs with homogeneously charged groups, in good agreement with DLVO predictions. Although the ligand composition on the surface of AuNPs is the same, OT particles have less negative EPM values and faster rate of bacterial adsorption, but much larger CCC compared to brOT. The deviation of OT particles from brOT and MUS in their self-aggregation behavior reflects the effects of surface heterogeneity on electrical double layer structures at the interface."

According to the news reporters, the research concluded: "Results from the present study demonstrated that, besides chemical composition, organization of ligands on particle surface is important in determining their colloidal stability."

For more information on this research see: Colloidal Stability of Self-Assembled Mono layer-Coated Gold Nanoparticles: The Effects of Surface Compositional and Structural Heterogeneity. Langmuir, 2013;29(37):11560-11566. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Langmuir -

Our news correspondents report that additional information may be obtained by contacting R.X. Huang, Ecole Polytechnic Fed Lausanne, Inst Mat, CH-1015 Lausanne, Switzerland. Additional authors for this research include R.P. Carney, F. Stellacci and B.L.T. Lau (see also Nanoparticles).

Keywords for this news article include: Europe, Lausanne, Switzerland, Nanotechnology, Gold Nanoparticles, Emerging Technologies

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Source: Science Letter

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