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Investigators from University of Massachusetts Target Nanoparticles (Ultrahigh Loading of Nanoparticles into Ordered Block Copolymer Composites)

August 22, 2014

By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Nanoparticles. According to news originating from Amherst, Massachusetts, by NewsRx correspondents, research stated, "Phase selective, ultrahigh loading of nanoparticles into target domains of block copolymer composites was achieved by blending the block copolymer hosts with small molecule additives that exhibit strong interactions with one of the polymer chain segments and with the nanoparticle ligands via hydrogen bonding. The addition of E.-tartaric acid to poly(ethylene oxide-block-tert-butyl acrylate) (PEO-b-PtBA) enabled the loading of more than 150 wt % of 4-hydroxythiophenol-functionalized Au nanoparticles relative to the mass of the target domain (PEO + tartaric acid), which corresponds to greater than 40 wt % Au by mass of the resulting well-ordered composite as measured by thermal gravimetric analysis."

Our news journalists obtained a quote from the research from the University of Massachusetts, "The additive, tartaric acid, performs three important roles. First, as evidenced by small-angle X-ray scattering, it significantly increases the segregation strength of the block copolymer via selective interaction with the hydrophilic PEO block. Second, it expands the PEO block and enhances the number and strength of enthalpically favorable interactions between the nanoparticle ligands and the host domain. Finally, it mitigates entropic penalties associated with NP incorporation within the target domain of the BCP composite."

According to the news editors, the research concluded: "This general approach provides a simple, efficient pathway for the fabrication of well-ordered organic/nanoparticle hybrid materials with the NP core content over 40 wt %."

For more information on this research see: Ultrahigh Loading of Nanoparticles into Ordered Block Copolymer Composites. Macromolecules, 2014;47(5):1844-1849. Macromolecules can be contacted at: Amer Chemical Soc, 1155 16TH St, NW, Washington, DC 20036, USA. (American Chemical Society -; Macromolecules -

The news correspondents report that additional information may be obtained from L. Yao, University of Massachusetts, Dept. of Polymer Sci & Engn, Amherst, MA 01003, United States. Additional authors for this research include Y. Lin and J.J. Watkins (see also Nanoparticles).

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

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Source: Science Letter

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