FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2092844268> ?p ?o ?g. }

• W2092844268 endingPage "3698" @default.
• W2092844268 startingPage "3690" @default.
• W2092844268 abstract "Powder X-ray diffraction (XRD), 29Si magic-angle-spinning (MAS) NMR spectroscopy, and transmission electron microscopy (TEM) as well as N2 adsorption have been employed to study the formation of various mesophases that lead to the synthesis of cubic mesoporous MCM-48 molecular sieve. A typical synthesis is performed at 373 K, pH = 11.8 using tetraethyl orthosilicate as the silicon source and cetyltrimethylammonium bromide (CTAB) as the structure-directing agent with a molar gel composition of 1:0.23:0.55:112SiO2/Na2O/CTAB/H2O. XRD shows that a disordered tubular mesophase (H1) rapidly forms and then transforms to a layered phase (L1) upon heating at 373 K for 5−10 h. After the hydrothermal treatment continues for 72 h, the layered phase (L1) gradually transforms to a cubic MCM-48 mesophase (V), which is accompanied by a slight pH increase of about 0.2 units. Prolonged hydrothermal treatment for over 120 h results in further structural transformation from the cubic mesophase V to a second layered phase (L2). 29Si MAS NMR reveals that the L2 layered phase has a more regular atomic arrangement than the other three mesophases. However, the silica condensation increases monotonicly in the order H1 → L1 → V → L2 with hydrothermal treatment time. The cubic MCM-48 mesophase is not completely stable under hydrothermal synthesis conditions since it converts to the L2 phase. This may account for the poor repeatability of prior syntheses of MCM-48 material. We show that cubic MCM-48 can be stabilized either by addition of acetic acid to maintain a constant gel pH or by selection of the reaction time to prevent further mesophase transformation. TEM and N2 adsorption data show well-defined three-dimensional channels for the cubic MCM-48." @default.
• W2092844268 created "2016-06-24" @default.
• W2092844268 creator A5000686027 @default.
• W2092844268 creator A5032230355 @default.
• W2092844268 creator A5039706816 @default.
• W2092844268 creator A5067787708 @default.
• W2092844268 creator A5087751758 @default.
• W2092844268 date "1998-10-29" @default.
• W2092844268 modified "2023-10-17" @default.
• W2092844268 title "A Reliable Synthesis of Cubic Mesoporous MCM-48 Molecular Sieve" @default.
• W2092844268 cites W1967609943 @default.
• W2092844268 cites W1972747505 @default.
• W2092844268 cites W1978883338 @default.
• W2092844268 cites W1980704616 @default.
• W2092844268 cites W1982175365 @default.
• W2092844268 cites W1982784029 @default.
• W2092844268 cites W1984900874 @default.
• W2092844268 cites W1985737462 @default.
• W2092844268 cites W1987334490 @default.
• W2092844268 cites W1992017120 @default.
• W2092844268 cites W1995016632 @default.
• W2092844268 cites W1995041236 @default.
• W2092844268 cites W1997693922 @default.
• W2092844268 cites W1999702451 @default.
• W2092844268 cites W2000398686 @default.
• W2092844268 cites W2000966264 @default.
• W2092844268 cites W2004288618 @default.
• W2092844268 cites W2006991115 @default.
• W2092844268 cites W2011804950 @default.
• W2092844268 cites W2018669437 @default.
• W2092844268 cites W2032814418 @default.
• W2092844268 cites W2035363362 @default.
• W2092844268 cites W2035599183 @default.
• W2092844268 cites W2040727351 @default.
• W2092844268 cites W2042602209 @default.
• W2092844268 cites W2046273496 @default.
• W2092844268 cites W2048168907 @default.
• W2092844268 cites W2055273107 @default.
• W2092844268 cites W2067306591 @default.
• W2092844268 cites W2073792053 @default.
• W2092844268 cites W2084471207 @default.
• W2092844268 cites W2085036443 @default.
• W2092844268 cites W2089012282 @default.
• W2092844268 cites W2092089089 @default.
• W2092844268 cites W2100431223 @default.
• W2092844268 cites W2108677188 @default.
• W2092844268 cites W2168210489 @default.
• W2092844268 cites W2312199777 @default.
• W2092844268 cites W2331212077 @default.
• W2092844268 doi "https://doi.org/10.1021/cm980440d" @default.
• W2092844268 hasPublicationYear "1998" @default.
• W2092844268 type Work @default.
• W2092844268 sameAs 2092844268 @default.
• W2092844268 citedByCount "226" @default.
• W2092844268 countsByYear W20928442682012 @default.
• W2092844268 countsByYear W20928442682013 @default.
• W2092844268 countsByYear W20928442682014 @default.
• W2092844268 countsByYear W20928442682015 @default.
• W2092844268 countsByYear W20928442682016 @default.
• W2092844268 countsByYear W20928442682017 @default.
• W2092844268 countsByYear W20928442682018 @default.
• W2092844268 countsByYear W20928442682019 @default.
• W2092844268 countsByYear W20928442682020 @default.
• W2092844268 countsByYear W20928442682021 @default.
• W2092844268 countsByYear W20928442682022 @default.
• W2092844268 countsByYear W20928442682023 @default.
• W2092844268 crossrefType "journal-article" @default.
• W2092844268 hasAuthorship W2092844268A5000686027 @default.
• W2092844268 hasAuthorship W2092844268A5032230355 @default.
• W2092844268 hasAuthorship W2092844268A5039706816 @default.
• W2092844268 hasAuthorship W2092844268A5067787708 @default.
• W2092844268 hasAuthorship W2092844268A5087751758 @default.
• W2092844268 hasConcept C105281773 @default.
• W2092844268 hasConcept C127413603 @default.
• W2092844268 hasConcept C150394285 @default.
• W2092844268 hasConcept C156622251 @default.
• W2092844268 hasConcept C161790260 @default.
• W2092844268 hasConcept C171250308 @default.
• W2092844268 hasConcept C178790620 @default.
• W2092844268 hasConcept C185592680 @default.
• W2092844268 hasConcept C192562407 @default.
• W2092844268 hasConcept C2776300020 @default.
• W2092844268 hasConcept C2776871784 @default.
• W2092844268 hasConcept C2777432599 @default.
• W2092844268 hasConcept C2778827576 @default.
• W2092844268 hasConcept C3535393 @default.
• W2092844268 hasConcept C42360764 @default.
• W2092844268 hasConcept C44280652 @default.
• W2092844268 hasConcept C62129180 @default.
• W2092844268 hasConcept C8010536 @default.
• W2092844268 hasConcept C82776694 @default.
• W2092844268 hasConceptScore W2092844268C105281773 @default.
• W2092844268 hasConceptScore W2092844268C127413603 @default.
• W2092844268 hasConceptScore W2092844268C150394285 @default.
• W2092844268 hasConceptScore W2092844268C156622251 @default.
• W2092844268 hasConceptScore W2092844268C161790260 @default.
• W2092844268 hasConceptScore W2092844268C171250308 @default.
• W2092844268 hasConceptScore W2092844268C178790620 @default.

• next