Nanostructure of Materials Determined by Relayed Paramagnetic Relaxation Enhancement | Zendy

Judith Schlagnitweit | Zendy; Mingxue Tang | Zendy; Maria Baias | Zendy; Sara Richardson | Zendy; Staffan Schantz | Zendy; Lyndon Emsley | Zendy

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Nanostructure of Materials Determined by Relayed Paramagnetic Relaxation Enhancement

Author(s) -

Judith Schlagnitweit,

Mingxue Tang,

Maria Baias,

Sara Richardson,

Staffan Schantz,

Lyndon Emsley

Publication year - 2015

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/jacs.5b08249

Subject(s) - chemistry , nanostructure , paramagnetism , relaxation (psychology) , nanotechnology , magnetic relaxation , chemical physics , condensed matter physics , magnetic field , physics , quantum mechanics , psychology , social psychology , materials science , magnetization

Particle and domain sizes strongly influence the properties of materials. Here we present an NMR approach based on paramagnetic relaxation enhancement (PRE) relayed by spin diffusion (SD), which allows us to determine lengths in the nm-μm range. We demonstrate the method on multicomponent organic polymer mixtures by selectively doping one component with a paramagnetic center in order to measure the domain size in a second component. Using this approach we determine domain sizes in ethyl cellulose/hydroxypropyl cellulose film coatings in pharmaceutical controlled release formulations. Here we measure particle sizes ranging from around 50 to 200 nm.

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