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Mesoporous Materials with Spherical Morphology : Synthesis and Bioapplication
Yang, Haifeng,Yan, Yan,Zhao, Dongyuan 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.7
Morphology control is one of the most interesting issues in the research field of mesoporous materials. It plays a very important role in understanding the basic synthesis mechanism of the kind of materials. Moreover, the future applications of mesoporous materials are strongly depended on their tunable macroscopical morphologies. Mesoporous materials with spherical morphology are quite attractive due to the potential applications in macromolecular separations, drug deliveries, catalysis supports and template agents for photonic crystals. Researches on synthesis and properties of the materials have been carried out for nearly ten years. In this article, several synthetic methods for both siliceous and non-siliceous mesoporous spheres are reviewed, including solution self-assembly, aerosol spraying and hard templating route. The mechanism of self-assembly in solution system is provided and the rational controls for synthetic conditions are specifically discussed. With the viewpoint of applications, some examples are given in the aspects of bioseparations, drug delivery and catalysis. A short summary has listed some overviews for future developments.
Free-standing and bridged amine-functionalized periodic mesoporous organosilica films
Park, Sung Soo,Shin, Jeong Hun,Zhao, Dongyuan,Ha, Chang-Sik Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.36
<P>In this work, we report the first successful synthesis of free-standing and bridged amine-functionalized PMO films grown at the air–water interface using 1,2-bis(triethoxysilyl)ethane (BTEE) and bis[(3-trimethoxysilyl)propyl]amine (BTMSPA) as silica sources and cationic alkyltrimethylammonium surfactant as the structure-directing agent. The films with thickness from 50 to 380 nm had a highly ordered periodic mesostructure with a two-dimensional (2D) hexagonal closed-packed arrangement of channels running parallel to the surface. The typical pore diameter and surface area of the film after solvent-extraction were 28.9 Å and 630 m<SUP>2</SUP> g<SUP>−1</SUP>, respectively, when the film was synthesized at 95 °C for 8 h with the reaction composition of 1.0 BTEE : 0.05 BTMSPA : 0.57 C<SUB>16</SUB>TABr : 2.28 NaOH : 336 H<SUB>2</SUB>O. <SUP>29</SUP>Si and <SUP>13</SUP>C cross polarization (CP) MAS NMR spectra identified that the organic-inorganic moieties (Si–CH<SUB>2</SUB>–CH<SUB>2</SUB>–Si and Si–(CH<SUB>2</SUB>)<SUB>3</SUB>NH(CH<SUB>2</SUB>)<SUB>3</SUB>–Si) are the basic structural unit in the film.</P> <P>Graphic Abstract</P><P>We report the successful synthesis of a free-standing, bridged, amine-functionalized PMO film with good flexibility, grown at the air–water interface. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm01278e'> </P>
Klingstedt, Miia,Miyasaka, Keiichi,Kimura, Kosuke,Gu, Dong,Wan, Ying,Zhao, Dongyuan,Terasaki, Osamu Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.35
<P>We present a comprehensive analysis for pore structures of cage-type ordered mesoporous carbons (OMCs) using various electron microscopy techniques in addition to conventional nitrogen adsorption isotherm studies. The benefits and drawbacks of these techniques are evaluated, and it is shown that they are complementary to each other. Knowledge of the structural properties, pore sizes, and connectivity gives insight into the synthesis strategies and how they are affecting the material properties that are useful within the possible applications. Herein, focus is put on the two OMCs with <I>Im</I>3̄<I>m</I> and <I>Fm</I>3̄<I>m</I> symmetries specified by FDU-16 and FDU-18. The central techniques used in this study are high resolution scanning electron microscopy combined with cross-section polisher and three-dimensional reconstruction methods (electron tomography and electron crystallography) based on transmission electron microscopy observations.</P> <P>Graphic Abstract</P><P>Quantification of pore size and shape irregularity for mesoporous materials is demonstrated based on SEM/TEM observations including three-dimensional reconstructions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm11789k'> </P>
Park, Sung Soo,Chu, Sang-Wook,Xue, Chunfeng,Zhao, Dongyuan,Ha, Chang-Sik Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.29
<P>Highly nitrogen-enriched mesoporous carbon nitride materials with 2-dimensional (2-D) (2D-meso-CN) and 3-dimensional (3-D) mesostructures (3D-meso-CN) were synthesized using mesoporous silica as a hard template and cyanamide as a precursor <I>via</I> the incipient wetness process without using any solvent. The materials were characterized by small-angle X-ray scattering (SAXS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) for the mesostructure analysis, N<SUB>2</SUB> adsorption–desorption isotherms for surface area and pore size distribution, and X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared (FT-IR) spectroscopy for the composition analysis of frameworks. The mesoporous carbon nitride replicas have graphitic-like stacking of carbon nitride sheets in mesopore walls. The N/C ratio of the mesoporous carbon nitride replicas is 1.13 after the carbonization at 550 °C for 3 h. 2D-meso-CN and 3D-meso-CN have the BET surface area of 361 and 343 m<SUP>2</SUP> g<SUP>−1</SUP>, large pore volume of 0.50 and 0.67 cm<SUP>3</SUP> g<SUP>−1</SUP>, and pore diameter of 27.8 Å (for 2D-meso-CN), 24.5 and 80.3 Å (for 3D-meso-CN), respectively. It was found that the 3D-meso-CN has higher capacity of hydrogen uptake of 0.25 wt% than the pure mesoporous carbon FDU-15 (0.16 wt%) at 50 bar under room temperature (298 K).</P> <P>Graphic Abstract</P><P>Highly nitrogen-enriched mesoporous carbon nitride materials with 2-dimensional (2-D) (2D-meso-CN) and 3-dimensional (3-D) mesostructures (3D-meso-CN) were synthesized using mesoporous silica as a hard template and cyanamide as a precursor <I>via</I> the incipient wetness process without using any solvent. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm10849b'> </P>
Shi, Yifeng,Hua, Chunxiu,Li, Bin,Fang, Xiangpeng,Yao, Chaohua,Zhang, Yichi,Hu, Yong‐,Sheng,Wang, Zhaoxiang,Chen, Liquan,Zhao, Dongyuan,Stucky, Galen D. WILEY‐VCH Verlag 2013 Advanced functional materials Vol.23 No.14
<P><B>Abstract</B></P><P>Highly ordered mesoporous crystalline MoSe<SUB>2</SUB> is synthesized using mesoporous silica SBA‐15 as a hard template via a nanocasting strategy. Selenium powder and phosphomolybdic acid (H<SUB>3</SUB>PMo<SUB>12</SUB>O<SUB>40</SUB>) are used as Se and Mo sources, respectively. The obtained products have a highly ordered hexagonal mesostructure and a rod‐like particle morphology, analogous to the mother template SBA‐15. The UV‐vis‐NIR spectrum of the material shows a strong light absorption throughout the entire visible wavelength region. The direct bandgap is estimated to be 1.37 eV. The high surface area MoSe<SUB>2</SUB> mesostructure shows remarkable photocatalytic activity for the degradation of rhodamine B, a model organic dye, in aqueous solution under visible light irradiation. In addition, the synthesized mesoporous MoSe<SUB>2</SUB> possess a reversible lithium storage capacity of 630 mAh g<SUP>−1</SUP> for at least 35 cycles without any notable decrease. The rate performance of mesoporous MoSe<SUB>2</SUB> is much better than that of analogously synthesized mesoporous MoS<SUB>2</SUB>, making it a promising anode for the lithium ion battery.</P>