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Lee, Hyung Ik,Stucky, Galen D.,Kim, Jin Hoe,Pak, Chanho,Chang, Hyuk,Kim, Ji Man WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.20
<P><B>Colloidal silica templated mesoporous carbons</B>, which have not only systematically expanded large cage size (5–45 nm) but also controlled window size (5–25 nm), are successfully obtained via spontaneous phase separation of boron species from mixture of carbon precursor, boric acid, and colloidal silica during carbonization process. This novel synthesis offers a new chance to control the pore structure in materials obtained by nano‐replication using rigid templates. </P>
Periodic Mesoporous Organosilica with a Hexagonally Pillared Lamellar Structure
Lee, Hyung Ik,Kim, Ji Man,Stucky, Galen D. American Chemical Society 2009 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.131 No.40
<P>Ordered mesoporous materials (OMMs) with well-defined pore sizes (>2 nm) and pore geometries are important in various applications that require fast mass transfer or deal with large molecules. Extensive research has resulted in the discovery of OMMs with three types of mesostructures: (i) bi- or multicontinuous, (ii) columnar, and (iii) discontinuous (cagelike). However, another type, the pillared lamellar structure, which has long been sought and has been mathematically computed and known to exist in the research fields of surfactant and multiblock-copolymer mesophases, still remains a mesostructure that has not been observed in real OMMs for any specific symmetry. Herein, we report an unprecedented type of ordered mesoporous material with a hexagonally pillared lamellar (HPL) structure (P6(3)/mmc) that can be synthesized via a phase transformation from a lamellar mesophase by hydrothermal reaction in the presence of an organosilica precursor and a high concentration of a designed Gemini surfactant (Gem(16-3-16)) that has a large g value. The present GMO-HPL, which has an unique three-dimensional periodic structure with two-dimensionally connected pore channels running between the framework layers, provides a fascinating topological link between the lamellar and columnar (2D hexagonal) mesophases. It is unique in its application potential by making possible selective 2D diffusion in different directions.</P>
Lee, Hyung Ik,Kim, Jin Hoe,Stucky, Galen D.,Shi, Yifeng,Pak, Chanho,Kim, Ji Man Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.39
<P>Mesoporous silica structures are of increasing importance as supports for enzymes and molecular organometallic catalysts. For high-surface-area, porous 3-d catalytic supports, the relationship between the exterior particle morphology and the 3-d mesopore structure is of particular significance. This paper describes the designed synthesis of selected morphologies of mesoporous SBA-15, which can be chosen from micrometer sized spheres to hundreds or tens of nanometers sized monodispersed particles such as platelets, hexagonal columns, rice-shapes, rods with tunable aspect ratios, and donuts. These are directly synthesized <I>via</I> control of the fundamental synthesis factors, including initial temperature, stirring rate and micelle packing parameter, rather than by the use of additives that have been generally utilized for specific morphologies in previous reports. The relationship between these basic synthesis parameters and morphologies provides insights into the formation of mesostructured materials.The SBA materials with various morphologies are expected to be useful in applications that require anisotropic or path-length-controlled diffusion.</P> <P>Graphic Abstract</P><P>Control of fundamental synthesis factors such as initial temperature, stirring rate, and micelle-packing parameter enables morphological control of mesoporous SBA-15 silica over wide size range and improves its potential applications. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm00820f'> </P>
Lee, Eun Zoo,Lee, Sun Uk,Heo, Nam-Su,Stucky, Galen D.,Jun, Young-Si,Hong, Won Hi The Royal Society of Chemistry 2012 Chemical communications Vol.48 No.33
<P>A turn-on fluorescence sensor, Cu<SUP>2+</SUP>–c-mpg-C<SUB>3</SUB>N<SUB>4</SUB>, was developed for detection of CN<SUP>−</SUP> in aqueous solution by simply mixing cubic mesoporous graphitic carbon nitride (c-mpg-C<SUB>3</SUB>N<SUB>4</SUB>) and aqueous solution of Cu(NO<SUB>3</SUB>)<SUB>2</SUB>. The highly sensitive detection of CN<SUP>−</SUP> with a detection limit of 80 nM is not only possible in aqueous solution but also in human blood serum.</P> <P>Graphic Abstract</P><P>A turn-on fluorescence sensor, Cu<SUP>2+</SUP>–c-mpg-C<SUB>3</SUB>N<SUB>4</SUB>, was developed for detection of CN<SUP>−</SUP> in aqueous solution by simply mixing cubic mesoporous graphitic carbon nitride (c-mpg-C<SUB>3</SUB>N<SUB>4</SUB>) and aqueous solution of Cu(NO<SUB>3</SUB>)<SUB>2</SUB>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc17909a'> </P>
Gyoung Hee Hong,Zhengyang Li,박진서,Zhenghua Li,Ki Yeong Kim,Chengbin Li,이정호,Mingshi Jin,Galen D. Stucky,Ji Man Kim 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-
Highly ordered mesoporous molybdenum dioxide (meso-MoO2) was successfully synthesized by a nanoreplicationmethod using a mesoporous silica template with 3D cubic Ia3d mesostructure. Structuralanalyses using X-ray diffraction, N2 sorption, and electron microscopy indicated that the meso-MoO2material exhibited high surface area (106 m2/g), large pore volume (0.66 cm3/g), and well-defined mesopores. Under the optimized reaction conditions, the meso-MoO2 catalyst showed excellent catalytic performancesfor the acetalization of glycerol with acetone (95.8% of glycerol conversion, and 97.8% ofsolketal selectivity) at 20 C, due to its high surface area with large number of acid sites. During recycling,the meso-MoO2 catalyst exhibited a slight decrease in activity; and after a simple regeneration at 350 C,the catalytic performances could be completely recovered. More importantly, a partial hydrophobic treatmentof the meso-MoO2 catalyst dramatically enhanced the water-tolerance during the catalytic reaction.
Enhanced Li storage performance of ordered mesoporous MoO2 via tungsten doping.
Fang, Xiangpeng,Guo, Bingkun,Shi, Yifeng,Li, Bin,Hua, Chunxiu,Yao, Chaohua,Zhang, Yichi,Hu, Yong-Sheng,Wang, Zhaoxiang,Stucky, Galen D,Chen, Liquan RSC Pub 2012 Nanoscale Vol.4 No.5
<P>Ordered mesoporous tungsten-doped MoO(2) was synthesized by a nanocasting method. The Li storage performance of mesoporous MoO(2) is significantly improved by tungsten doping, which exhibits a reversible capacity of 700 mA h g(-1), better cycling and rate performance. This material combines the advantages of the high theoretical capacity of MoO(2) and the better electroactivity of WO(2).</P>