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https://hdl.handle.net/1959.11/13897
Title: | Organization of mixed dimethyldioctadecylammonium and choline modifiers on the surface of synthetic hectorite | Contributor(s): | Andriani, Yosephine (author); Jack, Kevin S (author); Gilbert, Elliot P (author); Edwards, Grant A (author); Schiller, Tara (author); Strounina, Ekaterina (author); Osman, Azlin F (author); Martin, Darren J (author) | Publication Date: | 2013 | DOI: | 10.1016/j.jcis.2013.07.055 | Handle Link: | https://hdl.handle.net/1959.11/13897 | Abstract: | Understanding the nature of mixed surfactant self-assembly on the surface of organoclays is an important step toward optimizing their performance in polymer nanocomposites and for other potential applications, where selective surface interactions are crucial. In segmented thermoplastic polyurethane nanocomposite systems, dual-modified organoclays have shown significantly better performance compared to their single-modified counterparts. Until now, we had not fully characterized the physical chemistry of these dual-modified layered silicates, but had hypothesized that the enhanced composite performance arises due to some degree of nanoscale phase separation on the nanofiller surface, which enables enhanced compatibilization and more specific and inclusive interactions with the nanoscale hard and soft domains in these thermoplastic elastomers. This work examines the organization of quaternary alkyl ammonium compounds on the surface of Lucentite SWN using X-ray diffraction (XRD), thermogravimetric analysis (TGA), attenuated total reflectance Fourier-transfer infrared (ATR FT-IR), ¹³C cross-polarization (CP)/magic angle spinning (MAS) nuclear magnetic resonance (NMR), and small-angle neutron scattering (SANS). When used in combination with choline, dimethyldioctadecylammonium (DMDO) was observed to self-assemble into discontinuous hydrophobic domains. The inner part of these hydrophobic domains was essentially unaffected by the choline (CC); however, surfactant intermixing was observed either at the periphery or throughout the choline-rich phase surrounding those domains. | Publication Type: | Journal Article | Source of Publication: | Journal of Colloid and Interface Science, v.409, p. 72-79 | Publisher: | Academic Press | Place of Publication: | United States of America | ISSN: | 1095-7103 0021-9797 |
Fields of Research (FoR) 2008: | 030399 Macromolecular and Materials Chemistry not elsewhere classified 030306 Synthesis of Materials 030302 Nanochemistry and Supramolecular Chemistry |
Fields of Research (FoR) 2020: | 340399 Macromolecular and materials chemistry not elsewhere classified 340207 Metal organic frameworks |
Socio-Economic Objective (SEO) 2008: | 970103 Expanding Knowledge in the Chemical Sciences 970102 Expanding Knowledge in the Physical Sciences |
Socio-Economic Objective (SEO) 2020: | 280105 Expanding knowledge in the chemical sciences 280120 Expanding knowledge in the physical sciences |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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