By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Nanoparticles. According to news reporting from Boston, Massachusetts, by NewsRx journalists, research stated, "A molecular theoretical description is developed to describe the adsorption of nanoparticles (NPs) that are coated with polymers and functionalized with (surface) acid groups. Results are presented for the adsorption onto both negatively and positively charged surfaces as a function of pH and salt concentration, polymer coating, and NP size."
The news correspondents obtained a quote from the research from Boston University, "An important finding is that nanoparticles that are coated with weak charge regulating acid molecules such as citric acid develop an asymmetric charge distribution close to a charged surface, due to their finite size. Depending on the sign of the surface charge of the adsorbing surface, a nanoparticle close to the surface either gains more charge or loses charge compared to its 'bulk' degree of charge. This in turn influences the amount of NPs that adsorb. The effect of adsorption of negatively charged NPs onto a positively charged surface shows a nonmonotonical variation with pH."
According to the news reporters, the research concluded: "The described charging mechanism reveals that details such as size of the NP and acid distribution on the NP need to be considered to provide an accurate understanding of the adsorption process."
For more information on this research see: Adsorption of Acid and Polymer Coated Nanoparticles: A Statistical Thermodynamics Approach. Langmuir, 2013;29(47):14482-14493. Langmuir can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society - www.acs.org; Langmuir - www.pubs.acs.org/journal/langd5)
Our news journalists report that additional information may be obtained by contacting R.J. Nap, Boston University, Dept. of Biomed Engn, Boston, MA 02215, United States. Additional authors for this research include Y. Park, J.Y. Wong and I. Szleifer (see also Nanoparticles).
Keywords for this news article include: Boston, Physics, Massachusetts, United States, Nanotechnology, Thermodynamics, Emerging Technologies, North and Central America
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