Micrometer-sized mesoporous diamond spherical particles
Micrometer-sized mesoporous diamond spherical particles
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DOI：
10.1016/j.diamond.2014.01.017
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发表时间：
2014-03-01
影响因子：
4.1
通讯作者：
Yuasa, Makoto
中科院分区：
文献类型：
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作者：
Kondo, Takeshi;Kobayashi, Mani;Yuasa, Makoto
采用喷雾干燥和微波等离子体辅助化学气相沉积（MPCVD）技术制备了微米级多孔金刚石球形颗粒（PDSPs）。氮气吸附测试表明，由5 nm爆轰ND颗粒制备的PDSP具有约300 m(2) g（-1）的brunauer - emmetttteller （BET）表面积和10 nm附近的窄孔径分布。对不同粒径粒径（粒径为20 ~ 50 nm）制备的PDSP的氮吸附分析表明，随着粒径从20 ~ 50 nm增大，其BET表面积减小(200 ~ 85 m(2) g(-1))，平均孔径增大（4.6 ~ 93 nm）。简单模型计算表明，PDSP的孔隙来源于NDs的粒子间空间。PDSP在HF和NaOH水溶液中耐浸。这表明金刚石基介孔材料具有极高的化学稳定性。利用光化学方法对PDSP表面进行了十八烷基修饰。在反相高效液相色谱（HPLC）柱中成功地使用了填充改性PDSP的色谱柱，并在水/乙腈混合流动相中成功地分离了有机化合物。(C) 2014 Elsevier B.V.版权所有
Micrometer-sized porous diamond spherical particles (PDSPs) were fabricated from nanodiamond (ND) particles using spray drying and microwave plasma-assisted chemical vapor deposition (MPCVD). Nitrogen gas sorption measurement revealed that the PDSP fabricated from 5 nm detonation ND particles had a Brunauer-EmmettTeller (BET) surface area of ca. 300 m(2) g(-1) and a narrow pore diameter distribution around 10 nm. Nitrogen sorption analysis of PDSP fabricated from various ND particle sizes (diameters from 20 to 50 nm) showed that the BET surface area decreased (200-85 m(2) g(-1)) and the average pore diameter increased (4.6-93 nm) as the ND diameter increased from 20 to 50 nm. Calculation with a simple model revealed that the pores of the PDSP were derived from the interparticle space of the NDs. The PDSP was durable to immersion in aqueous solutions of HF and NaOH. which indicates the extremely high chemical stability of the diamond-based mesoporous material. The PDSP surface was modified with octadecyl groups using a photochemical method. A column packed with the modified PDSP was successfully employed in a reverse phase high performance liquid chromatography (HPLC) column, and the successful separation of organic compounds was demonstrated with a water/acetonitrile mixture mobile phase. (C) 2014 Elsevier B.V. All rights reserved.