Topological construction of mesoporous materials

Current Opinion in Solid State and Materials Science

Volumn 3, Issue 1, 1998, Pages 111-121

  Zhao, Dongyuan ^a   Peidong, Yang ^a   Qisheng, Huo ^a   Bradley F, Chmelka ^a   Galen D, Stucky ^a  

^a University of California at Santa Barbara   (United States)

Author keywords

BET Brunauer Emmett Teller; CTAB cetyltrimethylammonium bromide; FWHM (full width at half maximum); SAM self assembled monolayer; SEM scanning electron microscopy; TBOS tetrabutyloxysilane; TEM transmission electron microscopy; TEOS tetraethyloxysilane

Indexed keywords

EID: 0039165666     PISSN: 13590286     EISSN: None     Source Type: Journal    
DOI: 10.1016/S1359-0286(98)80073-9     Document Type: Article

References (97)

1. Corma A. From microporous to mesoporous molecular sieve materials and their use in catalysis. Chem Rev. 97:1997;2373-2419.
2. Firouzi A, Stucky GD, Chmelka BF. Self-assembly of silicate-surfactant liquid crystals during mesophase materials syntheses. Occelli ML, Kessler H. Synthesis of Porous Materials. 1997;379-389 Marcel Dekker, New York.
3. Stucky GD, Huo Q, Firouzi A, Chmelka BF, Schacht S, Voigt-Martin IG, Schüth F. Directed synthesis of organic/inorganic composite structures. Chon H, Ihm S-K, Uh YS. Proceedings of the 11th International Zeolite Conference: 1996 August; Seoul. In Progress in zeolite and microporous materials. 105:1997;3-28 Elsevier, Amsterdam. [Studies in Surface Science and Catalysis].
4. Antonietti M, Göltner C. Superstructures of functional colloids: chemistry on the nanometer scale. Angew Chem Int Ed Engl. 36:1997;910-928.
5. Ozin GA. Morphogenesis of biomineral and morphosynthesis of biomimetic forms. Acc Chem Res. 30:1997;17-27.
6. Sayari A. Periodic mesoporous materials: synthesis, characterization and potential applications. Recent advances and new horizons in zeolite science and technology. 102:1996;1-46 Elsevier, Amsterdam. [Studies in Surface Science and Catalysis].
7. Mann S, Ozin GA. Synthesis of inorganic material with complex form. Nature. 382:1996;313-318.
8. Antonelli DM, Ying JY. Mesoporous materials. Curr Opin Colloid Interface Sci. 1:1996;523-529.
9. Zhao XS, Lu GQ, Millar GJ. Advances in mesoporous molecular sieve MCM-41. Ind Eng Chem Res. 35:1996;2075-2090.
10. Sayari A. Catalysis by crystalline mesoporous molecular sieves. Chem Mater. 8:1996;1840-1852.
11. Raman NK, Anderson MT, Brinker CJ. Template-based approaches to the preparation of amorphous, nanoporous silica. Chem Mater. 8:1996;1682-1701.
12. Firouzi A, Atef F, Oertli AG, Stucky GD, Chmelka BF. Alkaline Lyotropic silicate-surfactant liquid crystals. J Am Chem Soc. 119:1997;3596-3610 In situ NMR, XRD, and optical studies of the molecular parameters governing mesoscopic organization in silicate-surfactant lyotropic liquid crystals with hexagonal and lamellar morphologies under alkaline conditions. Detailed descriptions of the roles of the various silica species, the silicate-surfactant phase behavior, and the assembly processes that take place during mesophase formation are given.
13. Zhao D, Feng J, Huo Q, Melosh N, Fredrickson GH, Chmelka BF, Stucky GD. Copolymers syntheses of mesoporous silica with periodic 50 to 300 Ångstrom pores. Science. 279:1998;548-552 This paper reports the preparation of well-ordered hexagonal (p6mm) mesoporous silica structures (SBA-15) with uniform pore sizes from 46 Å to ~300 Å by use of amphiphilic block copolymers to direct the organization of polymerizing silica species in acidic media.
14. Imhof A, Pine DJ. Ordered macroporous materials by emulsion templating. Nature. 389:1997;948-951 This paper describes the use of monodispersed emulsions to create ordered microscale structures of silica, titania and zirconia in one-step synthesese.
15. Velev OD, Jede TA, Lobo RF, Lenhoff AM. Porous silica via colloidal crystallization. Nature. 389:1997;447-448.
16. Davis SA, Burkett SL, Mendelson NH, Mann S. Bacterial templating of ordered macrostructures in silica and silica-surfactant mesophases. Nature. 385:1997;420-423 Report of the preparation of ordered macroporous fibers of either amorphous silica or ordered hexagonal mesoporous silica by template-directed mineralization of the bacterial interfilament space followed by removal of organic materials by calcination.
17. 3/mmc) mesostructure at the oil/water interface, wherein the mesoporous hollow sphere structure is controlled by surfactant/silicate interactions but the macroscopic hollow sphere curvature is controlled by the emulsification of the oil phase.
18. 3 sponge phase are presented. This is an interesting prospect for creating tunable pore-size (20-100 nm) materials and high surface area films with accessible pores.
19. Lu Y, Gangli R, Drewien CA, Anderson MT, Brinker CJ, Gong W, Guo Y, Soyez H, Dunn B, Huang MH, Zink JI. Continuous formation of supported cubic and hexagonal mesoporous films by sol-gel dip-coating. Nature. 389:1997;364-368 The careful combination of organic/inorganic domain assembly and sol-gel chemistry in acid media is used to create continuous mesoporous films with cubic and hexagonal structures.
20. Huo Q, Leon R, Petroff PM, Stucky GD. Mesostructure design with gemini surfactants: supercage formation in a three-dimensional hexagonal array. Science. 268:1995;1324-1327.
21. Huo Q, Margolese D, Stucky GD. Surfactant control of phases in the synthesis of mesoporous silica-based materials. Chem Mater. 8:1996;1147-1160 This paper examines how the molecular shapes of covalent organosilanes, quaternary ammonium surfactants, and mixed surfactant arrays, in conjunction with various reaction conditions result in different silica-based mesostructured materials including MCM-41, -48, -50, SBA-1, -2, and -3.
22. Wu CG, Bein T. Conducting polyaniline filaments in a mesoporous channel host. Science. 264:1994;1757-1759.
23. Leon R, Margolese D, Stucky GD, Petroff PM. Nanocrystalline Ge filaments in the pores of a mesosilicate. Phys Rev B. 52:1995;R2285-R2288.
24. Ko CH, Ryoo R. Imaging the channels of mesoporous molecular sieves with platinum. Chem Commun. 1996;2467-2468.
25. Shido T, Yamamoto T, Harada M, Ichikawa M. XFAS characterization of platinum clusters synthesized in the channel of a mesoporous zeolite. J Phys IV. 7:1997;855-857.
26. Ciesla U, Schacht S, Stucky GD, Unger KK, Schüth F. Formation of a porous zirconium oxo phosphate with a high surface area by a surfactant-assisted synthesis. Int Ed Engl Angew Chem. 35:1996;541-543.
27. Yada M, Machida M, Kijima T. Synthesis and deorganization of an aluminum-based dodecyl sulfate mesophase with a hexagonal structure. J Chem Soc Chem Commun. 1996;769-770.
28. Vaudry F, Khodabandeh S, Davis ME. Synthesis of pure alumina mesoporous materials. Chem Mater. 8:1996;1451-1464.
29. Bagshaw SA, Pinnavaia TJ. Mesoporous alumina molecular sieves. Int Ed Engl Angew Chem. 35:1996;1104-1105.
30. 2 by a modified sol-gel method. Int Ed Engl Angew Chem. 34:1995;2012-2017.
31. Antonelli DM, Ying JY. Synthesis of stable hexagonally packed mesoporous niobium oxide molecular sieves through a novel ligand-assisted templating mechanism. Int Ed Engl Angew Chem. 35:1996;426-430.
32. Antonelli DM, Ying JY. Synthesis and characterization of hexagonally packed mesoporous tantalum oxide molecular sieves. Chem Mater. 8:1996;874-881.
33. Holland BT, Isbester PK, Blanford CF, Munson EJ, Stein A. Synthesis of ordered aluminophosphate and galloaluminophosphate mesoporous materials with anion-exchange properties utilizing polyoxometalate cluster/surfactant salts as precursors. J Am Chem Soc. 119:1997;6796-6803.
34. Zhao D, Luan Z, Kevan L. Synthesis of thermally stable mesoporous hexagonal aluminophosphate molecular sieves. Chem Commun. 1997;1009-1010.
35. 2.
36. Braun PV, Osenar P, Stupp SI. Semiconducting superlattices templated by molecular assemblies. Nature. 380:1996;325-328 An important example of using phase separation chemistry and polymer templating to create mesostructured phases with semiconducting superlattices.
37. Tohver V, Braun PV, Pralle X, Stupp SI. Counterion effects in liquid crystal templating of nanostructured Cds. Chem Mater. 9:1997;1495-1498.
38. Göltner CG, Antonietti M. Mesoporous material by templating of a liquid crystalline phase. Adv Mater. 9:1997;431-436.
39. Attard GS, Barrlett PN, Coleman NRB, Elliott JM, Owen JR, Wang JH. Mesoporous platinum films from lyotropic liquid crystalline phases. Science. 278:1997;838-840 Hexagonally structured, mesoporous platinum is formed by electrochemical reduction of platinum salts confined with the aqueous environments of the lyotropic liquid crystalline phases of surfactants.
40. Attard GS, Göltner CG, Corker JM, Henke S, Templer RH. Flüssigkristalle für nanostrukturiete Template. Liquid crystal templates for nanostructured metals Angew Chem. 109:1997;1372-1374 Hexagonally structured, mesoporous platinum is formed by impregnating the hexagonal lyotropic phase of octaethylenglycolmonohexadecylether with hexachloroplatanic acid and subsequent reduction with less noble metal.
41. Fowler CE, Burkett SL, Mann S. Synthesis and characterization of ordered organo-silica-surfactant mesophases with functionalized MCM-41-type architecture. Chem Commun. 1997;1769-1770.
42. Lim MH, Blanford CF, Stein A. Synthesis and characterization of a reactive vinyl-functionalized MCM-41: probing the internal pore structure by a bromination reaction. J Am Chem Soc. 119:1997;4090-4091 Report of a simple one-post synthesis of MCM-41 functionalization with a reactive vinyl group. A bromination reaction of the products provided evidence for attachment of most vinyl groups to accessible surface within the mesopore channels.
43. Burkett SL, Sims SD, Mann S. Synthesis of hybrid inorganic-organic mesoporous silica by co-condensation of siloxane and organosiloxane precursors. J Chem Soc Chem Commun. 1996;1367-1368 The use of organosiloxane as a method of functionalization of the mesoporous materials is described.
44. Brien SO, Tudor JT, Barlow S, Drewitt MJ, Heyes SJ, Hare OD. Modification of MCM-41 via ring opening of a strained [1] ferrocenophane. Chem Commun. 1997;641-642.
45. Yang H, Coombs N, Ozin GA. Morphogenesis of shapes and surface patterns in mesoporous silica. Nature. 386:1997;692-695 This work describes how the acid synthesis of hexagonal mesoporous silica produces an array of shapes, surface and channel patterns.
46. Ozin GA, Yang H, Sokolov I, Coombs N. Shell mimetics. Adv Mater. 9:1997;662-667.
47. Yang H, Kuperman A, Coombs N, Mamiche-Afara S, Ozin GA. Synthesis of oriented films of mesoporous silica on mica. Nature. 379:1996;703-705 Report of an ordered surfactant/silicate mesoscopic hexagonal film heterogeneously nucleated onto a solid substrate with pores oriented parallel to the substrate surface.
48. Huo Q, Zhao D, Feng J, Weston K, Buratto SK, Stucky GD, Schacht S, Schüth F. Room temperature growth of mesoporous silica fibers: a new high-surface area optical waveguide. Adv Mater. 9:1997;974-978 First report of long (up to centimeter scale) optically transparent mesoporous silica fibers, based on a two-phase system (oil and water) and one-step acid synthesis chemistry.
49. Yang H, Coombs N, Sokolov I, Ozin GA. Free-standing and oriented mesoporous silica films grown at the air-water interface. Nature. 381:1996;589-592 The authors report the formation of oriented mesoporous silica films at the air/water interface, consisting of cylindrical pores oriented parallel to one another and to the interface.
50. Aksay IA, Trau M, Honma I, Yao N, Zhou L, Fenter P, Eisenberger PM, Gruner SM. Biomimetic pathways for assembling inorganic thin films. Science. 273:1996;892-898 A review of solution-based approaches to thin films and nanolaminates with special emphasis on interfacial surfactant templating. By examining surfactant/silicate mesophases nucleated at different solid/liquid interfaces, the authors show that interfacial surfactant aggregates template the nanocomposite structure.
51. Ogawa M. A simple sol-gel route for the preparation of silica-surfactant mesostructured materials. J Chem Soc Chem Commun. 1996;1149-1150 Report of hexagonal silica-surfactant films prepared by a simple sol-gel process.
52. Hillhouse HW, Okubo T, van Egmond JW, Tsapatsis M. Preparation of supported mesoporous silica layers in a continuous flow cell. Chem Mater. 9:1997;1505-1507 This paper describes processing advancements in preparing mesoporous materials under continuous flow conditions.
53. Huo Q, Feng J, Schüth F, Stucky GD. Preparation of hard mesoporous silica spheres. Chem Mater. 9:1997;14-17 Selective preparation of hard transparent mesoporous silica spheres. Synthesis was achieved by a new approach involving emulsion chemistry using TBOS as a silica source.
54. Grün M, Lauer I, Unger KK. The synthesis of micrometer- and submicrometer-size spheres of ordered mesoporous oxide MCM-41. Adv Mater. 9:1997;254-257 Reports on the control of particle sizes of mesoporous silica spheres that were synthesized using cationic surfactants in basic media.
55. Lin H-P, Mou C-Y. Tubules-within-a-tubule hierarchical order of mesoporous molecular sieves in MCM-41. Science. 273:1996;765-768 A careful study of how the co-assembly of organic and inorganic species can be used to create hierarchical silica shapes and structures.
56. Bruinsma PJ, Kim AY, Liu J, Baskaran S. Mesoporous silica synthesized by solvent evaporation spun fibers and spray-dried hollow spheres. Chem Mater. 9:1997;2507-2512 This paper describes a simple synthesis method for mesoporous silica fibers and hollow spheres by fast solvent evaporation. Both the fibers and powder show highly ordered hexagonal mesostructures.
57. 3Immc) continuous thin films with 3D channel networks are synthesized and characterized.
58. Anderson MT, Martin JE, Odinek JG, Newcomer PP, Wilcoxon JP. Monolithic periodic mesoporous silica gels. Microporous Mater. 10:1997;13-24.
59. Martin JE, Anderson MT, Odinek JG, Newcomer PP. Synthesis of periodic mesoporous silica thin films. Langmuir. 13:1997;4133-4141.
60. 3 in ethanol, giving cation exchange capability.
61. Corma A, Martinez A, Martinez-Soria V. Hydrogenation of aromatics in diesel fuels on Pt-MCM-41 catalysts. J Catal. 169:1997;4880-4891.
62. Junges U, Schüth F, Schmid G, Uchida Y, Schlögl R. Synthesis and characterization of catalysts based on ligand-stabilized clusters incorporated in mesoporous oxides. Ber Bunsenges Physikal Chem. 101:1997;1631-1634.
63. Kloestra KR, van Laren M, van Bekkum H. Binary cesium-lanthanum oxide supported on MCM-41: a new stable heterogeneous basic catalyst. J Chem Soc Faraday Trans. 93:1997;1211-1220.
64. Carvalho WA, Varaldo PB, Wallau M, Schuchardt U. Mesoporous redox molecular sieves analogous to MCM-41. Zeolites. 18:1997;408-416.
65. Feng X, Fryxell GE, Wang LQ, Kim AY, Liu J, Kemner KM. Functionalized monolayers on ordered mesoporous supports. Science. 276:1997;923-925 A cross-linked monolayer of mercaptopropylsilane was covalently bound to mesoporous silica and closely packed on the surface. The functionalized mesoporous materials are extremely efficient in removing mercury and other heavy metals from both aqueous and non-aqueous waste streams, with partition coefficients up to 340,000.
66. Mercier L, Pinnavaia TJ. Access in mesoporous materials: advantages of a uniform pore structure in the design of a heavy metal ion adsorbent for environmental remediation. Adv Mater. 9:1997;500-503 This work demonstrated the vastly improved access of guest species to the binding sites of adsorbents designed from a mesostructure with well-defined mesopore channels, relative to those prepared from materials with disordered pore networks, such as silica gel.
67. Tang YS, Cai S, Jin G, Duan J, Wang KL, Soyez HM, Dunn BS. SiGe quantum dots prepared on an ordered mesoporous silica coated Si substrate. Appl Phys Lett. 71:1997;2448-2450.
68. Yanagisawa T, Shimizu T, Kuroda K, Kato C. The preparation of alkyltrimethylammonium-Kanemite complexes and their conversion to microporous materials. Bull Chem Soc Jpn. 63:1990;988-992.
69. Kresge CT, Leonowicz ME, Roth WJ, Beck JS. Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism. Nature. 359:1992;710-712.
70. Beck JS, Vartuli JC, Roth WJ, Leonowicz ME, Kresge CT, Schmitt KD, Chu CT-W, Olson DH, Sheppard EW, McCullen SB, et al. A new family of mesoporous molecular sieves prepared with liquid crystal templates. J Am Chem Soc. 114:1992;10834-10843.
71. Huo Q, Margolese DI, Ciesla U, Feng P, Gier TE, Sieger P, Leon R, Petroff PM, Schüth F, Stucky GD. Generalized synthesis of periodic surfactant/inorganic composite materials. Nature. 368:1994;317-321.
72. Huo Q, Margolese DI, Ciesla U, Demuth DG, Feng P, Gier TE, Sieger P, Firouzi A, Chmelka BF, Schüth F, Stucky GD. Organization of organic molecules with inorganic molecular species into nanocomposite biphase arrays. Chem Mater. 6:1994;1176-1191.
73. Firouzi A, Kumar D, Bull LM, Besier T, Sieger P, Huo Q, Walker SA, Zasadzinski JA, Glinka C, Nicol J, et al. Cooperative organization of inorganic-surfactant and biomimetic assemblies. Science. 267:1995;1138-1143.
74. Firouzi A, Schaefer DJ, Tolbert SH, Stucky GD, Chmelka BF. Magnetic-field-induced orientational ordering of alkaline lyotropic silicate-surfactant liquid crystals. J Am Chem Soc. 119:1997;9466-9477 By applying a magnetic field, noncondensed surfactant/silica liquid crystals can be macroscopically oriented, if heated above the anisotropic-to-isotropic phase transition temperature and then cooled in the magnetic field. Different orientations of the liquid crystal phases can be obtained by varying different organic cosolvent molecules in the composition.
75. Tolbert SH, Firouzi A, Stucky GD, Chmelka BF. Magnetic field alignment of ordered silicate-surfactant composites and mesoporous silica. Science. 278:1997;264-268 Magnetic field alignment of a hexagonal silicate-surfactant liquid crystal followed by silica polymerization and subsequent calcination yields oriented monolithic mesoporous silica phases. This procedure gives controlled orientation of pores with respect to monolith shape.
76. Voegtlin AC, Ruch F, Guth JL, Patarin J, Huve L. F-mediated synthesis of mesoporous silica with ionic and non-ionic surfactants. A new templating pathway. Microporous Mater. 9:1997;95-105 Synthesis of mesoporous silica phases at room temperature from solutions in the presence of fluoride anions at a pH between 6 and 10 using cetyltrimethylammonium cation and Triton X100, a nonionic surfactant.
77. Prouzet E, Pinnavaia TJ. Assembly of mesoporous molecular sieves containing wormhole motifs by a nonionic surfactant pathway: control of pore size by synthesis temperature. Int Ed Engl Angew Chem. 36:1997;516-518.
78. Bagshaw SA, Prouzet E, Pinnavaia TJ. Templating of mesoporous molecular sieves by nonionic polyethylene oxide surfactants. Science. 269:1995;1242-1244.
79. Tanev PT, Pinnavaia TJ. Biomimetic templating of porous lamellar silica by vesicular surfactant assemblies. Science. 271:1996;1267-1269 This paper reports a thermally stable porous lamellar silica by using a neutral diamine bola-amphiphile.
80. Attard GS, Glyde JC, Göltner CG. Liquid-crystalline phase as templates for the synthesis of mesoporous silica. Nature. 378:1995;366-368.
81. Templin M, Franck A, Chesne AD, Leist H, Zgang Y, Ulrich R, Schädler U, Wiesner U. Organically modified aluminosilicate mesostructures from block copolymer phases. Science. 278:1997;1795-1798 The authors report the syntheses of organically modified aluminosilicate mesostructures using poly(isoprene-b-ethyleneoxide) block copolymers as the templates. Lamellar and reversed hexagonal phases were obtained.
82. Bu X, Feng P, Stucky GD. Large-cage zeolite structures with multidimensional 12-ring channels. Science. 278:1997;2080-2085.
83. Belcher AM, Zaremba C, Huo Q, Landry CC, Tolbert SH, Firouzi A, Janicke M, Hansma PK, Morse DE, Chmelka BF, et al. The organic/inorganic interface and materials synthesis in the nano-to macroscale continuum. Chemistry on the Nanometer Scale. Proceedings of the 40th Robert A. Welch Foundation Conference on Chemical Research. 1996;101-112 Robert A. Welch Foundation, Houston TX, Discussion of the relation of the concepts of biomineralization assembly to silica mesoporous materials synthesis.
84. Gallis KW, Landry CC. Synthesis of MCM-48 by a phase transformation process. Chem Mater. 9:1997;2035-2038 A simple synthesis procedure for MCM-48 using conventional, easily-available surfactants is presented.
85. Feng J, Huo Q, Petroff PM, Stucky GD. Morphology definition by disclinations and dislocations in a mesostructured silicate crystal. Appl Phys Lett. 71:1997;620-622 Two types of dislocations, longitudinal edge dislocations and mixed dislocation dipoles; and two types of disclinations, single +π disclination and disclination quadrupoles are observed and identified in a MCM-41 crystal. The defects are formed during synthesis in the precursor, unpolymerized, liquid crystal-like silica/organic phase.
86. Yang H, Coombs N, Dag O, Sokolov I, Ozin GA. Free-standing mesoporous silica films; morphogenesis of channel and surface patterns. J Mater Chem. 7:1997;1755-1761 The formation of concentric circles, herringbones, fingerprints and hairpins are observed in an oriented mesoporous silica film that is synthesized at the boundary between air and water. The origin of the channel patterns may be from defects, such as disclinations and dislocations. A linear radial stress model is found to account for the warp patterns.
87. Trau M, Yao N, Kim E, Xia Y, Whitesides GM, Aksay IA. Microscopic patterning of oriented mesoscopic silica through guided growth. Nature. 390:1997;674-676 A supramolecular assembly of surfactant molecules is used to create tubular structures with diameters of around 10 nm which are then used for the templated polymerization of mesoporous silica thin films. An electric field is used to induce electro-osmotic flow and control the rate of silica polymerization by localized Joule heating. Removal of the mold leaves patterned bundles of oriented nanotubules on the surface. This method permits the formation of orientated mesoporous channels on a non-conducting substrate with an arbitrary microscopic pattern.
88. Raimondi ME, Maschmeyer T, Templer RH, Seddon JM. Synthesis of direct templated aligned mesoporous silica coating within capillaries. Chem Commun. 1997;1843-1844 The capillary substrate is used to direct silica polymerization and yield tubular mesoporous silica coatings.
89. Ogawa M. Formation of novel oriented transparent films of layered silica-surfactant nanocomposites. J Am Chem Soc. 116:1994;7941-7942.
90. Kumar A, Abott NL, Kim E, Biebuyck HA, Whitesides GM. Patterned self-assembled monolayers and meso-scale phenomena. Acc Chem Res. 28:1995;219-226.
91. Yang H, Coombs N, Ozin GA. Mesoporous silica with micrometer-scale designs. Adv Mater. 9:1997;811-814 Line arrays of oriented silica particles are deposited on alkane thiol decorated gold surfaces patterned (3-10 μm line dimensions) with polydimethylsiloxane stamps by SAM techniques.
92. Berret JF, Roux DC, Porte G. Isotropic-to-nematic transition in worm-like micelles under shear. J Phys II. 4:1994;1261-1279.
93. Cappelaere E, Cressely R, Makhloufi R, Decruppe JP. Temperature- and flow-induced viscosity transitions for CTAB surfactant solutions. Rheol Acta. 33:1994;431-437.
94. Jirage KB, Hulteen JC, Martin CR. Nanotubule-based molecular-filtration membranes. Science. 278:1997;655-657.
95. Bein T. Synthesis and application of molecular sieve layers and membranes. Chem Mater. 8:1996;1636-1653.
96. Diaz JF, Balkus KJ. Enzyme immobilization of MCM-41 molecular sieve. J Mol Catal B. 2:1996;115-126 A pioneering study of the possible utility of MCM-41 mesoporous phases for biocatalysis.
97. Tolbert SH, Sieger P, Stucky GD, Aubin SMJ, Wu CC, Hendrickson DN. Control of inorganic layer thickness in self-assembled iron oxide/surfactant composites. J Am Chem Soc. 119:1997;8652-8661.