@article { ISI:000234644600023,
	title = {Hydrothermal synthesis of MCM-41 using differently manufactured amorphous dioxosilicon sources},
	journal = {Materials Letters},
	volume = {60},
	number = {7},
	year = {2006},
	month = {APR},
	pages = {957-961},
	publisher = {ELSEVIER SCIENCE BV},
	type = {Article},
	address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS},
	abstract = {<p>The influence of differently manufactured amorphous dioxosilicon sources such as fumed silica (FS), spray dried precipitated silica (PSI) and flash dried precipitated silica (PS,) on the course of structural development and properties of hydrothermally prepared siliceous MCM-41 phases have been investigated. Powder XRD, N-2 adsorption/desorption and scanning electron microscopy techniques were used for sample characterization. On the basis of results obtained from time dependent study on the progressive development of MCM-41 mesophases, the reactivity trend of dioxosilicon sources observed was as: FS \&gt; PS1 \&gt; PS2. MCM-41 synthesized using least expensive PS2 having less surface area has exhibited thicker pore walls but poor orderness, while MCM-41 prepared from expensive FS having high surface area has thinner pore walls and was well ordered. The extent of contraction caused by calcination, magnitude of the wall thickness and structural stability were found to be dependent on manufacturing process of dioxosilicon sources. The noticeable morphological differences were also observed by variations in the type of dioxosilicon sources used in the hydrothermal synthesis MCM-41 materials. (c) 2005 Elsevier B.V. All rights reserved.</p>},
	keywords = {Characterization, dioxosilicon sources, Hydrothermal synthesis, MCM-41, porosity, Structural stability},
	issn = {0167-577X},
	doi = {10.1016/j.matlet.2005.10.049},
	author = {Gaydhankar, T. R. and Samuel, V. and Joshi, P. N.}
}
@article { ISI:000267367300016,
	title = {Synthesis of Si-MCM-41 from ternary SiO2-CTAOH-H2O system via dry gel conversion route},
	journal = {Journal of Sol-Gel Science and Technology},
	volume = {51},
	number = {2},
	year = {2009},
	month = {AUG},
	pages = {244-250},
	publisher = {SPRINGER},
	address = {VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS},
	abstract = {<p>Steam assisted dry gel conversion method was employed for the synthesis of Si-MCM-41 from ternary SiO2:CTAOH:H2O systems wherein fumed silica was used as a source of silica. The influence of synthesis time, molar ratios of CTAOH/SiO2 in dry gel and the water content at the bottom of autoclave on the quality and formation of mesophases has been investigated. Powder XRD, N-2 adsorption-desorption, TEM and hydrothermal stability test were the techniques used for sample characterization. Keeping molar ratio of CTAOH/SiO2 constant, shorter synthesis time, lower unit cell parameter and d spacing were observed when steam assisted dry gel conversion method was employed in place of conventional hydrothermal method. There exists an optimum lower limit for water content at the bottom of autoclave for reducing the synthesis period. Keeping synthesis temperature and CTAOH/SiO2 molar ratio fixed, Si-MCM-41 with improved hydrothermal stability was obtained by steam assisted dry gel conversion route.</p>},
	keywords = {Dry gel conversion, powder diffraction, Si-MCM-41, Sol-gel growth, Structural stability, Textural properties},
	issn = {0928-0707},
	doi = {10.1007/s10971-009-1969-3},
	author = {Taralkar, U. S. and Niphadkar, P. S. and Joshi, P. N.}
}
