Preparation of Al-MCM-48 and Ti-MCM-48

2014 ◽  
Vol 716-717 ◽  
pp. 114-117
Author(s):  
Zhi Xi Zhao ◽  
Li Ming Zhang ◽  
Ping Chen
Keyword(s):  
Sodium Hydroxide ◽  
Hydrothermal Method ◽  
Cetyltrimethylammonium Bromide ◽  
Tetraethyl Orthosilicate ◽  
Lamellar Phase ◽  
Mesoporous Sieves ◽  
Mcm 41

In system of cetyltrimethylammonium bromide (CTAB), tetraethyl orthosilicate (TEOS) and sodium hydroxide, the mesoporous sieves MCM-48 with hetero atom could be synthesized by adding different aluminum and titanium sources. The results showed that M41S family of hexagonal (MCM-41), cubic (MCM-48) and lamellar phase (MCM-50) could be synthesized respectively through hydrothermal method by adjusting the alkalinity in synthesis gel exactly.

Cetyltrimethylammonium bromide- and ethylene glycol-assisted preparation of mono-dispersed indium oxide nanoparticles using hydrothermal method

2014 ◽  
Vol 68 (8) ◽  
Author(s):  
Selvakumar Dhanasingh ◽  
Dharmaraj Nallasamy ◽  
Saravanan Padmanapan ◽  
Vinod Padaki
Keyword(s):  
Ethylene Glycol ◽  
Hydrothermal Method ◽  
Indium Oxide ◽  
Cetyltrimethylammonium Bromide ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Transmission Electron ◽  
Diffraction Patterns

AbstractThe influence of cetyltrimethylammonium bromide and ethylene glycol on the size and dispersion of indium oxide nanoparticles prepared under hydrothermal conditions was investigated. The precursor compound, indium hydroxide, obtained by the hydrothermal method in the absence as well as the presence of cetyltrimethylammonium bromide, was converted to indium oxide by sintering at 400°C. The formation of nanoscale indium oxide upon sintering was ascertained by the characteristic infrared adsorption bands and X-ray diffraction patterns of indium oxide. Transmission electron microscopy and band gap values confirmed that the cetyltrimethylammonium bromide facilitated the formation of indium oxide nanoparticles smaller in size and narrower in distribution than those prepared without the assistance of cetyltrimethylammonium bromide.

A heterogeneous catalytic strategy for facile production of benzimidazoles and quinoxalines from primary amines using Al-MCM-41 catalyst

2021 ◽  
Author(s):  
Narender Nama ◽  
Vasu Amrutham ◽  
Naresh Mameda ◽  
Krishna Sai Gajula ◽  
Divya rohini yennamaneni ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Solvent Free ◽  
Nitrogen Heterocycle ◽  
Primary Amines ◽  
Heterogeneous Catalytic ◽  
Solvent Free Conditions ◽  
Mcm 41

This study reports a straightforward heterogonous catalytic (Al-MCM-41) approach to synthesize nitrogen heterocycle moieties from primary amines under solvent-free conditions. The Al-MCM-41 catalyst was prepared using a hydrothermal method and...

Study on effects of sodium hydroxide on synthesis of zinc telluride nanocrystals by hydrothermal method

2012 ◽  
Vol 15 (2) ◽  
pp. 131-135 ◽  
Author(s):  
B.B. Wang ◽  
M.K. Zhu ◽  
H. Wang ◽  
G.B. Dong ◽  
H.L. Xie
Keyword(s):  
Sodium Hydroxide ◽  
Hydrothermal Method ◽  
Zinc Telluride

Preparation and characterization of poly(styrenemethacrylic acid)/MCM-41 core/shell nanocomposite microspheres

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Yansheng Zhao ◽  
Xingji Ma ◽  
Yongmei Liu ◽  
Guangwei Yuan ◽  
Meijuan Guo ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cetyltrimethylammonium Bromide ◽  
Average Diameter ◽  
Molar Ratio ◽  
Core Shell ◽  
Acidic Media ◽  
Assembly Method ◽  
20 Nm ◽  
Mcm 41

AbstractIn acidic media, poly(styrene-methacrylic acid)/MCM-41 [P(St- MAA)/MCM-41] core/shell microspheres were synthesized using monodisperse P(St-MAA) particles contained in soap-free emulsion and cetyltrimethylammonium bromide as co-templates by adsorption self-assembly method. The effects of P(St- MAA) composition on shell structure of the core/shell microspheres were investigated. The morphology and composition of P(St-MAA)/MCM-41 microspheres were characterized by TEM, XRD and FTIR. The results show that the ordering degree of MCM-41 shells increased as the molar ratio of MAA to St increased. When n(MAA)/n(St) is 0.2, the average diameter and the shell thickness of nanocomposite microspheres are about 170 nm and 20 nm, respectively.

Friction and Rheological Properties of Meso-Porous MCM-41/Unsaturated Polyester In Situ Composites

2014 ◽  
Vol 599-601 ◽  
pp. 18-21
Author(s):  
Shu Long Hu ◽  
Jian Lv ◽  
Feng Ying Lu ◽  
Hua Shan Liu ◽  
De Ming Zeng
Keyword(s):  
Wear Resistance ◽  
Rheological Properties ◽  
Cetyltrimethylammonium Bromide ◽  
Room Temperature ◽  
Polyester Resin ◽  
In Situ Polymerization ◽  
Unsaturated Polyester ◽  
Roller Milling ◽  
Mcm 41

In this paper, meso-porous MCM-41 was synthesized at room temperature using cationic surfactant cetyltrimethylammonium bromide (CTAB) as the template agent. Then MCM-41/unsatura-ted polyester resin (UPR) materials were prepared by in-situ polymerization with the meso-porous MCM-41. MCM-41/UPR in-situ composites were prepared by roller milling and molding processes. Effects of meso-porous MCM-41 on rheological properties and wear resistance of the MCM-41/UPR composites have been investigated. It is shown that MCM-41 has a diameter in range of 4-5 nm and the pores are highly ordered. MCM-41 can improve the rheological properties and wear resistance of the composites. When MCM-41 content is 2%, the mass abrasion loss is decreased by 37.4%.

scholarly journals Effect of Sodium Hydroxide Concentration in Synthesizing Zinc Selenide/Graphene Oxide Composite via Microwave-Assisted Hydrothermal Method

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2295 ◽  
Author(s):  
Han Kee Lee ◽  
Zainal Abidin Talib ◽  
Md Shuhazlly Mamat @ Mat Nazira ◽  
EnZe Wang ◽  
Hong Ngee Lim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Sodium Hydroxide ◽  
Hydrothermal Method ◽  
Zinc Selenide ◽  
Band Gap Energy ◽  
Material Research ◽  
Microwave Assisted ◽  
Naoh Solution ◽  
The Subject

The effect of NaOH solution on the formation of nanoparticles has been the subject of ongoing debate in selenium-based material research. In this project, the robust correlation between the mechanistic growth of zinc selenide/graphene oxide (ZnSe/GO) composite and the concentration of NaOH are elucidated. The ZnSe/GO composite was synthesized via microwave-assisted hydrothermal method and the concentrations of NaOH are controlled at 2 M, 3 M, 4 M, 5 M and 6 M. The XRD spectra show that the crystal phases of the samples exhibited a 100% purity of ZnSe when the concentration of sodium hydroxide (NaOH) was set at 4 M. The further increase of NaOH concentration leads to the formation of impurities. This result reflects the essential role of hydroxyl ions in modifying the purity state of ZnSe/GO composite. The optical band gap energy of ZnSe/GO composite also decreased from 2.68 eV to 2.64 eV when the concentration of NaOH increased from 2 M to 4 M. Therefore, it can be concluded that the optimum concentration of NaOH used in synthesizing ZnSe/GO composite is 4 M. This project provides an alternative green method in the formation of a high purity ZnSe/GO composite.

Determination of the Lamellar Phase Content in MCM-41 Using X-ray Diffraction, Nitrogen Adsorption, and Thermogravimetry

2000 ◽  
Vol 104 (7) ◽  
pp. 1581-1589 ◽  
Author(s):  
Michal Kruk ◽  
Mietek Jaroniec ◽  
Yong Yang ◽  
Abdelhamid Sayari
Keyword(s):  
Nitrogen Adsorption ◽  
Lamellar Phase ◽  
Phase Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mcm 41

Promotional effects of cetyltrimethylammonium bromide surface modification on a hematite photoanode for photoelectrochemical water splitting

RSC Advances ◽  
2015 ◽  
Vol 5 (121) ◽  
pp. 100142-100146 ◽  
Author(s):  
Qian Li ◽  
Rajini P. Antony ◽  
Lydia Helena Wong ◽  
Dickon H. L. Ng
Keyword(s):  
Surface Modification ◽  
Hydrothermal Method ◽  
Water Splitting ◽  
Cetyltrimethylammonium Bromide ◽  
Nanorod Array ◽  
Photoelectrochemical Water Splitting ◽  
Simple Hydrothermal Method

A hematite nanorod array was treated with cetyltrimethylammonium bromide (CTAB) surfactant by a simple hydrothermal method.

Fabrication and Luminescent Properties of YVO4: Eu3+/MCM-41 Mesoporous Composites

2014 ◽  
Vol 707 ◽  
pp. 102-105
Author(s):  
Yi Jiang ◽  
Su Wen Li
Keyword(s):  
Hydrothermal Method ◽  
Luminescent Properties ◽  
Mesoporous Structure ◽  
Luminescence Properties ◽  
Ordered Mesoporous ◽  
Structure Morphology ◽  
Intrinsic Excitation ◽  
Mesoporous Composites ◽  
Mcm 41

The optical functionalized YVO4: Eu3+/MCM-41 mesoporous composites were prepared by hydrothermal method. The structure, morphology, luminescence properties and fluorescence dynamics were studied systemically. The compared studies of the luminescence properties of YVO4: Eu3+/MCM-41 with YVO4: Eu3+ nanocrystal were performed. The results show that the YVO4: Eu3+/MCM-41 retains high ordered mesoporous structure of MCM-41. In YVO4: Eu3+/MCM-41, the intrinsic excitation bands of Eu3+ disappears and the lifetimes of Eu3+ become short. The luminescent efficiency of YVO4: Eu3+/MCM-41 is higher than ones of the YVO4: Eu3+ nanocrystal.

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