The structure of MCM-48 determined by electron crystallography

Carlsson, Anna; Kaneda, Mizue; Sakamoto, Yasuhiro; Terasaki, Osamu; Ryoo, Ryong; Joo, Sang Hoon

doi:10.1093/oxfordjournals.jmicro.a023751

Cited by 142 publications

(113 citation statements)

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“…Figures 6 (a) and (b) show that the silica wall of the AMS-10 follows a typical diamond minimal surface (D surface). This is a close analogy for the gyroid minimal surface (G surface) observed for the silica wall of MCM-48 28) . We conclude that AMS-10 has a bicontinuous structure consisting of an enantiomeric pair of 3D mesoporous networks that are interwoven as shown in Fig.…”

Section: Structure Of Ams-10supporting

confidence: 75%

Synthesis of Mesoporous Silica Materials by Using Anionic Surfactants as Template

Yokoi

Tatsumi

2007

J. Jpn. Petrol. Inst.

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Mesoporous materials have attracted a great deal of attention because of their controllable structures and compositions, which make them suitable for a wide range of applications in catalysis, environmental clean-up, and development of advanced materials. Various mesoporous materials can be synthesized based on the self-assembly of surfactants and inorganic precursors. We previously demonstrated a novel templating route for preparing mesoporous silicas based on the self-assembly of anionic surfactants and inorganic precursors in the presence of aminosilane or quaternized aminosilane as a co-structure-directing agent (CSDA). We continue to investigate the resultant novel mesoporous materials called anionic surfactant mesoporous silica (AMS). The latest AMS series is a novel bicontinuous cubic Pn3 m mesoporous silica (AMS-10). We have also found that the assynthesized AMS is transformed into amino-functionalized mesoporous silica, by removal of only the surfactant by extraction, with potential uses as high-performance catalysts and adsorbents. Furthermore, the use of a chiral anionic surfactant derived from the amino acid, N-myristoyl-N-myristoyl-N l-alanine sodium salt, provides chiral mesoporous silica. Such anionic surfactant templating routes will provide a new family of mesoporous materials as well as information on the structural behavior of anionic surfactants. This review describes the preparation, properties, and potential applications of anionic surfactant templated mesoporous silicas.

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Section: Structure Of Ams-10supporting

confidence: 75%

Synthesis of Mesoporous Silica Materials by Using Anionic Surfactants as Template

Yokoi

Tatsumi

2007

J. Jpn. Petrol. Inst.

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“…), 3D hexagonal (P6 3 /mmc [4] ), cubic (Pm3 n, [5,6] Fd3 m, [7,8] Im3 m, [6,9] Fm3 m, [10,11] etc), bicontinuous cubic (Ia3 d, [2,12] Pn3 m, [13] etc), 2D hexagonal (p6mm [2,14] ), and lamellar phase. [2] The mesoporous silicas that have these mesostructures were obtained from different synthesis systems by using cationic, anionic or non-ionic surfactants as a structure-directing agent (SDA).…”

Section: Introductionmentioning

confidence: 99%

Formation of Diverse Mesophases Templated by a Diprotic Anionic Surfactant

Gao

Sakamoto

Terasaki

et al. 2008

Chemistry A European J

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The synthesis system for mesophase formation, using the diprotic anionic surfactant N-myristoyl-L-glutamic acid (C(14)GluA) as the structure-directing agent (SDA) and N-trimethoxylsilylpropyl-N,N,N-trimethylammonium chloride (TMAPS) as the co-structure-directing agent (CSDA), has been investigated and a full-scaled synthesis-field diagram is presented. In this system we have obtained mesophases including three-dimensional (3D) micellar cubic Fm3m, Pm3n, Fd3m, micellar tetragonal P4(2)/mnm, two-dimensional (2D) hexagonal p6mm and bicontinuous cubic Pn3m, by varying the C(14)GluA/NaOH/TMAPS composition ratios. From the diagram it can be concluded that the mesophase formation is affected to a high degree by the organic/inorganic-interface curvature and the mesocage-mesocage electrostatic interaction. Bicontinuous cubic and 2D-hexagonal phases were found in the low organic/inorganic-interface curvature zones, whereas micellar cubic and tetragonal mesophases were found in the high organic/inorganic-interface curvature zones. Formation of cubic Fm3m and tetragonal P4(2)/mnm was favoured in highly alkaline zones with strong mesocage-mesocage interactions, and formation of cubic Pm3n and Fd3m was favoured with moderate mesocage-mesocage interactions in the less alkaline zones of the diagram.

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“…[24] The XRD pattern of OMC-SBA-16 shows three well-resolved Bragg diffraction peaks at angles below 5…”

Section: Resultsmentioning

confidence: 99%

Influence of the OMCs pore structures on the capacitive performances of supercapacitor

Nong

Wang

2009

Asia-Pacific J Chem Eng

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In the present study, two mesoporous carbons OMC-KIT-6 and OMC-SBA-16 were nanocasted using mesoporous silica of KIT-6 and SBA-16 as templates and furfuryl alcohol as carbon precursor. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) characterizations confirmed that the resultant samples are mesoporous carbons, and the as-prepared OMC-KIT-6 has an Ia3d ordered structure, whereas OMC-SBA-16 belongs to Im3m space group. The surface area and the average pore size are (1658 m 2 g −1 and 3.4 nm) for OMC-KIT-6 and (1638 m 2 g −1 and 2.9 nm) for OMC-SBA-16, respectively. The results of cyclic voltammograms and galvanostatic charge-discharge tests show that these two mesoporous carbons have excellent capacitive performances. But the difference of capacitive behavior between OMC-KIT-6 and OMC-SBA-16 may be a result of the difference of pore geometries of these two carbons. In order to find out the function of mesopore in a supercapacitor, we compared the capacitive properties of mesoporous and microporous carbons; the experiment results indicated that these two kinds of carbon exhibit nearly ideal capacitive behavior at low scan rate. When the scan rate is enhanced up to 50 mV s −1 the performance of mesoporous carbon is more stable than microporous carbon. This outcome demonstrated that mesopore plays an important role in forming double layers in the electrode materials. 

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The structure of MCM-48 determined by electron crystallography

Cited by 142 publications

References 0 publications

Synthesis of Mesoporous Silica Materials by Using Anionic Surfactants as Template

Synthesis of Mesoporous Silica Materials by Using Anionic Surfactants as Template

Formation of Diverse Mesophases Templated by a Diprotic Anionic Surfactant

Influence of the OMCs pore structures on the capacitive performances of supercapacitor

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