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- W2000993074 abstract "We report the formation of core−shell diamond particles for solid-phase extraction (SPE) and high-performance liquid chromatography (HPLC) made by layer-by-layer (LbL) deposition. Their synthesis begins with the amine functionalization of microdiamond by its immersion in an aqueous solution of a primary amine-containing polymer (polyallylamine (PAAm)). The amine-terminated microdiamond is then immersed in an aqueous suspension of nanodiamond, which leads to adsorption of the nanodiamond. Alternating (self-limiting) immersions in the solutions of the amine-containing polymer and the suspension of nanodiamond are continued until the desired number of nanodiamond layers is formed around the microdiamond. Finally, the core−shell particles are cross-linked with 1,2,5,6-diepoxycyclooctane or reacted with 1,2-epoxyoctadecane. Layer-by-layer deposition of PAAm and nanodiamond is also studied on planar Si/SiO2 surfaces, which were characterized by scanning electron microscopy (SEM), Rutherford backscattering spectrometry (RBS), and nuclear reaction analysis (NRA). Core−shell particles are characterized by diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), environmental scanning electron microscopy (ESEM), and Brunauer−Emmett−Teller (BET) surface area and pore size measurements. Larger (ca. 50 μm) core−shell diamond particles have much higher surface areas and analyte loading capacities in SPE than nonporous solid diamond particles. Smaller (ca. 3 μm), normal and reversed-phase, core−shell diamond particles have been used for HPLC, with 36 300 plates/m for mesitylene in a separation of benzene and alkyl benzenes and 54 800 plates/m for diazinon in a similar separation of two pesticides on a C18 adsorbent." @default.
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- W2000993074 date "2010-05-06" @default.
- W2000993074 modified "2023-09-25" @default.
- W2000993074 title "Core−Shell Diamond as a Support for Solid-Phase Extraction and High-Performance Liquid Chromatography" @default.
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- W2000993074 doi "https://doi.org/10.1021/ac1002068" @default.
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