Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 6, Pages 4149-4157Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b11871
Keywords
detonation nanodiamonds; primary nanoparticles; organosilica; surface modification; hydrogenation; stationary phase; HPLC
Funding
- USA National Science Foundation [CHE 1058373, CHE 1508105]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1508105] Funding Source: National Science Foundation
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Nanodiamond (ND) particles (similar to 5 nm), obtained from detonation soot, were oxidized and/or thermally hydrogenated. Both, the non-hydrogenated and hydrogenated ND particles were successfully coupled to the surface of micrometer-size organo-silica particles. A thin layer of nanodiamonds (NDs) decorating the surface of the organo-silica particles was visible on transmission electron microscopy (TEM) images. X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy (IR) were used to characterize the NDs prior to coupling and to confirm attachment onto the organo-silica particles. Both, ultraviolet (UV) radiation and a chemical initiator were proved to be effective radical initiators for the ND-silica coupling reaction, although for scale-up purposes the chemical initiation was more advantageous to produce the ND-silica composite. Commercially available nanodiamond primary particles were also coupled to the surface of silica particles. The ND-containing silica particles were packed into chromatographic columns to study their initial feasibility as adsorbent material for liquid chromatography. The organo-silica particles decorated with hydrogenated NDs were shown to possess reversed phase type (i.e., hydrophobic) behavior toward the probe compounds, whereas silica particles decorated with the non-hydrogenated NDs showed polar (i.e., hydrophilic) interactions, both under liquid chromatographic conditions.
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