Influence of ion exchange and calcination on pore size and thermal stability of MCM-41 with different Si/Al ratios

1998 ◽  
Vol 94 (6) ◽  
pp. 817-820 ◽  
Author(s):  
Heico Koch ◽  
Uwe Böhmer ◽  
Andreas Klemt ◽  
Wladimir Reschetilowski ◽  
Michael Stöcker
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Pore Size ◽  
Thermal Stability Of ◽  
Mcm 41

ChemInform Abstract: Influence of Ion Exchange and Calcination on Pore Size and Thermal Stability of MCM-41 with Different Si/Al Ratios.

ChemInform ◽  
2010 ◽  
Vol 29 (23) ◽  
pp. no-no
Author(s):  
H. KOCH ◽  
U. BOEHMER ◽  
A. KLEMT ◽  
W. RESCHETILOWSKI ◽  
M. STOECKER
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Pore Size ◽  
Thermal Stability Of ◽  
Mcm 41

Ion Exchange and Thermal Stability of MCM-41

1995 ◽  
Vol 99 (45) ◽  
pp. 16742-16747 ◽  
Author(s):  
Ji Man Kim ◽  
Ja Hun Kwak ◽  
Shinae Jun ◽  
Ryong Ryoo
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Thermal Stability Of ◽  
Mcm 41

ChemInform Abstract: Ion Exchange and Thermal Stability of MCM-41.

ChemInform ◽  
2010 ◽  
Vol 27 (8) ◽  
pp. no-no
Author(s):  
J. M. KIM ◽  
J. H. KWAK ◽  
S. JUN ◽  
R. RYOO
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Thermal Stability Of ◽  
Mcm 41

Effect of the hydrophilicity of the polymer matrix on immobilized α-chymotrypsin

1984 ◽  
Vol 49 (6) ◽  
pp. 1552-1556
Author(s):  
Minoru Kumakura ◽  
Isso Kaetsu
Keyword(s):  
Thermal Stability ◽  
Enzyme Activity ◽  
Pore Size ◽  
Polymer Matrix ◽  
Low Temperatures ◽  
Radiation Polymerization ◽  
Thermal Stability Of

α-Chymotrypsin was immobilized by radiation polymerization at low temperatures and the effect of the hydrophilicity of the polymer matrix on the enzyme activity and thermal stability was studied. The activity and thermal stability of immobilized chymotrypsin increased with the increasing hydrophilicity of the polymer matrix or monomer. The thermal stability was affected by the form and pore size of the polymer matrix; chymotrypsin immobilized on a soft-gel polymer matrix exhibited an enhanced thermal stability.

Immobilization of hemoglobin on stable mesoporous multilamellar silica vesicles and their activity and stability

2005 ◽  
Vol 20 (10) ◽  
pp. 2682-2690 ◽  
Author(s):  
Yufang Zhu ◽  
Weihua Shen ◽  
Xiaoping Dong ◽  
Jianlin Shi
Keyword(s):  
Thermal Stability ◽  
Pore Size ◽  
X Ray Diffraction ◽  
X Ray ◽  
Practical Applications ◽  
Silica Material ◽  
Transmission Electron ◽  
Mesoporous Support ◽  
Adsorption Desorption ◽  
Thermal Stability Of

A stable mesoporous multilamellar silica vesicle (MSV) was developed with a gallery pore size of about 14.0 nm. A simulative enzyme, hemoglobin (Hb), was immobilized on this newly developed MSV and a conventional mesoporous silica material SBA-15. The structures and the immobilization of Hb on the mesoporous supports were characterized with x-ray diffraction, transmission electron microscopy, N2 adsorption-desorption isotherms, Fourier transform infrared, ultraviolet-visible spectroscopy, and so forth. MSV is a promising support for immobilizing Hb due to its large pore size and high Hb immobilization capacity (up to 522 mg/g) compared to SBA-15 (236 mg/g). Less than 5% Hb was leached from Hb/MSV at pH 6.0. The activity study indicated that the immobilized Hb retained most peroxidase activity compared to free Hb. Thermal stability of the immobilized Hb was improved by the proctetive environment of MSV and SBA-15. Such an Hb-mesoporous support with high Hb immobilization capacity, high activity, and enhanced thermal stability will be attractive for practical applications.

Thermal stability of Si–MCM-41 in gaseous atmosphere

2003 ◽  
Vol 57 (24-25) ◽  
pp. 3839-3842 ◽  
Author(s):  
Keshu Wan ◽  
Qian Liu ◽  
Cunman Zhang
Keyword(s):  
Thermal Stability ◽  
Gaseous Atmosphere ◽  
Thermal Stability Of ◽  
Mcm 41

scholarly journals Effect of preparation method on the properties of poly(methyl methacrylate)/mesoporous silica composites

2019 ◽  
Vol 2 (3) ◽  
pp. 363-370 ◽  
Author(s):  
M. A. Sibeko ◽  
M. L. Saladino ◽  
F. Armetta ◽  
A. Spinella ◽  
A. S. Luyt
Keyword(s):  
Thermal Stability ◽  
Mesoporous Silica ◽  
Methyl Methacrylate ◽  
Pore Size ◽  
Preparation Method ◽  
Polymer Chains ◽  
Melt Mixing ◽  
Poly Methyl Methacrylate ◽  
Mcm 41

Abstract The preparation method of a polymer composite and the filler loading are amongst the factors that influence the properties of the final composites. This article studies the effect of these factors on the thermal stability and thermal degradation kinetics of poly(methyl methacrylate) (PMMA)/mesoporous silica (MCM-41) composites filled with small amounts of MCM-41. The PMMA/MCM-41 composites were prepared through in situ polymerisation and melt mixing methods, with MCM-41 loadings of 0.1, 0.3, and 0.5 wt.%. The presence of MCM-41 increased the thermal stability of PMMA/MCM-41 composites prepared by melt mixing, but in the case of the in situ polymerised samples, the MCM-41 accelerated the degradation of the polymer. As a result, the activation energy was low and less energy was required to initiate and propagate the degradation process of these composites. The small-angle X-ray scattering (SAXS) measurements showed that the preparation method of the composites had no influence on the pore size of MCM-41, but the PMMAs used in the two methods both had shorter chains than the MCM-41 pore size. This allowed the polymer chains to be trapped inside the pores of the filler and be immobilised, as was observed from nuclear magnetic resonance (NMR) spectroscopy. The immobilisation of the polymer chains was more significant in the in situ polymerised samples.

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