In Situ Investigation on the Formation Mechanism of MCM-41 Mesoporous Silica by Microcalorimetry

2009 ◽  
Vol 54 (1) ◽  
pp. 83-89 ◽  
Author(s):  
Zhaodong Nan ◽  
Meiyun Wang ◽  
Bianqing Yan
Keyword(s):  
Mesoporous Silica ◽  
Formation Mechanism ◽  
In Situ Investigation ◽  
Mcm 41

Effective nitrosamines trap derived from the in situ carbonized mesoporous silica MCM-41

2010 ◽  
Vol 176 (1-3) ◽  
pp. 602-608 ◽  
Author(s):  
Jia Yuan Yang ◽  
Jing Yang ◽  
Yu Zhou ◽  
Wei Gang Lin ◽  
Hong Ji Wang ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Mcm 41

Polycaprolactone/mesoporous silica MCM-41 composites prepared by in situ polymerization

Particuology ◽  
2017 ◽  
Vol 30 ◽  
pp. 135-143 ◽  
Author(s):  
Laura Lopez-Figueras ◽  
Nuria Navascues ◽  
Silvia Irusta
Keyword(s):  
Mesoporous Silica ◽  
In Situ Polymerization ◽  
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.

Investigation on Mn-loaded mesoporous silica MCM-41 prepared via reducing KMnO4 with in situ surfactant

2005 ◽  
Vol 81 (1-3) ◽  
pp. 235-240 ◽  
Author(s):  
Xiaoping Dong ◽  
Weihua Shen ◽  
Yufang Zhu ◽  
Liangmin Xiong ◽  
Jinlou Gu ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Mcm 41

Photoluminescence of Poly(P-Phenylene Vinylene) Encapsulated in Mesoporous Silica

1999 ◽  
Vol 558 ◽  
Author(s):  
Andras G. Pattantyus-Abraham ◽  
Michael O. Wolf
Keyword(s):  
Thermogravimetric Analysis ◽  
Mesoporous Silica ◽  
In Situ Polymerization ◽  
Nitrogen Adsorption ◽  
Phenylene Vinylene ◽  
Polymer Loading ◽  
Nitrogen Adsorption Isotherms ◽  
Spectrum Matching ◽  
Mcm 41

ABSTRACTThe preparation of poly(p-phenylene vinylene) (PPV) encapsulated in a mesoporous silica, MCM-41, is reported. In situ polymerization of xylylene bis(tetrahydrothiophenium chloride) yields a highly luminescent, yellow powder with a fluorescence spectrum matching that of unencapsulated PPV. Nitrogen adsorption isotherms show that the pore size of the PPV- loaded MCM-41 is significantly smaller than that of empty MCM-41 and a polymer loading of ca. 8% by weight is obtained by thermogravimetric analysis. Photoluminescence data for the encapsulated PPV are presented.

Stable CdTe nanocrystals grown in situ in thiol-modified MCM-41 mesoporous silica: Control synthesis and electrochemical detection of Cu 2+

2016 ◽  
Vol 221 ◽  
pp. 48-57 ◽  
Author(s):  
Jose C. Santos ◽  
Charlene R.S. Matos ◽  
George B.S. Pereira ◽  
Tiago B.S. Santana ◽  
Helio O. Souza ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Electrochemical Detection ◽  
Control Synthesis ◽  
Cdte Nanocrystals ◽  
Mcm 41
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