Photochromism of 1,2-Bis(2-methyl-6-nitro-1-benzothiophen-3-yl)perfluorocyclopentene in a Single-Crystalline Phase:  Dichroism of the Closed-Ring Form Isomer

1999 ◽  
Vol 121 (37) ◽  
pp. 8450-8456 ◽  
Author(s):  
Seiya Kobatake ◽  
Motoki Yamada ◽  
Taro Yamada ◽  
Masahiro Irie
Keyword(s):  
Crystalline Phase ◽  
Single Crystalline ◽  
Ring Form ◽  
Closed Ring

Preparation of Macroprous C12A7 Mayenite Monoliths via a Sol-Gel Process with Nitrates as Precursors

2018 ◽  
Vol 768 ◽  
pp. 211-217 ◽  
Author(s):  
Rui Wang ◽  
Yu Kun Sun ◽  
Bao Jia Qi Jiang ◽  
Hui Yang ◽  
Xing Zhong Guo
Keyword(s):  
Heat Treatment ◽  
Phase Separation ◽  
Binary System ◽  
Propylene Oxide ◽  
Crystalline Phase ◽  
Sol Gel ◽  
Single Crystalline ◽  
Sol Gel Process

Macroporous Ca12Al14O33(C12A7) mayenite monoliths have been successfully prepared via a sol-gel process in the presence of propylene oxide (PO) and poly (ethyleneoxide) (PEO). Gelation of CaO-Al2O3binary system with nitrates salts as additional precursors is accelerated by PO as an acid scavenger, while PEO works as a phase separation inducer to mediate the phase separation of the system. Appropriate PO and PEO amounts allow the formation of monolithic xerogel with interconnected macropores and co-continuous skeletons. The resultant dried gels are amorphous and the single crystalline phase Ca12Al14O33mayenite forms after heat-treatment at 1100 °C in air, while the macrostructure is preserved with a porosity as high as 78% and smoother and denser skeletons.

Zeolite Syntheses from Superalkaline Reaction Mixtures

1992 ◽  
Vol 57 (4) ◽  
pp. 788-793 ◽  
Author(s):  
Falk Fischer ◽  
Marianne Hadan ◽  
Günter Fiedrich
Keyword(s):  
Ir Spectroscopy ◽  
Crystalline Phase ◽  
Ion Concentration ◽  
Single Crystalline ◽  
Hydroxyl Ion ◽  
Type Zeolite

The synthesis of faujasite-type zeolite from superalkaline reaction mixtures are described. The contribution shows the influence of component K2O added in the system Na2O-Al2O3-SiO2-H2O with H2O/(K2O + Na2O) = 13-15. The reaction course was investigated in the range K2O/(K2O + Na2O) from about 0.07 to 0.5. Under used conditions it is quite possible to isolate faujasite-type zeolite as a single crystalline phase. By means of IR spectroscopy, low SiO2/Al2O3 ratios from 2.0 to 2.1 in the faujasite framework have been indicated. The low SiO2/Al2O3 ratios are interpreted by a higher stability of the Si-O-Al- than the Si-O-Si- bond with increasing hydroxyl ion concentration.

Single-Crystalline-Phase Mo3VOx: An Efficient Catalyst for the Partial Oxidation of Acrolein to Acrylic Acid

ChemCatChem ◽  
2013 ◽  
Vol 5 (10) ◽  
pp. 2869-2873 ◽  
Author(s):  
Chen Chen ◽  
Nakatani Kosuke ◽  
Toru Murayama ◽  
Wataru Ueda
Keyword(s):  
Acrylic Acid ◽  
Partial Oxidation ◽  
Crystalline Phase ◽  
Efficient Catalyst ◽  
Single Crystalline

Reversible Diastereoselective Photocyclization of a Diarylethene in a Single-Crystalline Phase

2000 ◽  
Vol 122 (40) ◽  
pp. 9631-9637 ◽  
Author(s):  
Tetsuhiro Kodani ◽  
Kenji Matsuda ◽  
Taro Yamada ◽  
Seiya Kobatake ◽  
Masahiro Irie
Keyword(s):  
Crystalline Phase ◽  
Single Crystalline

Drug Adsorption Property of Surfaces of Polarized Calcium Phosphate Powders

2013 ◽  
Vol 566 ◽  
pp. 302-305
Author(s):  
Naohiro Horiuchi ◽  
Miho Nakamura ◽  
Akiko Nagai ◽  
Kimihiro Yamashita
Keyword(s):  
Calcium Phosphate ◽  
Tricalcium Phosphate ◽  
Adsorption Property ◽  
Electrostatic Force ◽  
Surface Charges ◽  
Depolarization Current ◽  
Ring Form ◽  
Closed Ring ◽  
Electrical Polarity ◽  
Polarized Surface

Calcium phosphate powders (hydroxyapatite, α-tricalcium phosphate, β-tricalcium phosphate, and tetracalcium phosphate) were electrically polarized by an applied dc voltage. Thermally stimulated depolarization current measurements confirmed that each calcium phosphate powder exhibited surface charges after polarization treatment. The surface adsorption of simvastatin on each powder was investigated. We observed a difference in adsorption between polarized and non-polarized powders. This difference in adsorption is due to the electrostatic force between the polarized surface and the open-ring form of simvastatin, which has a larger electrical polarity than its closed-ring form.

Photochromism and Photomagnetism of Biindenylidene-Dione Derivative in a Single Crystalline Phase

2002 ◽  
Vol 389 (1) ◽  
pp. 33-37 ◽  
Author(s):  
Lili Xu ◽  
Jiben Meng ◽  
Hui Wang ◽  
Ping Li ◽  
Teruki Sugiyama ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Single Crystalline ◽  
Dione Derivative

Zeolite - Salt Occlusion: A Potential Route for the Immobilisation of Iodine-129?

2003 ◽  
Vol 807 ◽  
Author(s):  
Neil C. Hyatt ◽  
Joseph A. Hriljac ◽  
Alia Choudhry ◽  
Laura Malpass ◽  
Gareth P. Sheppard ◽  
...  
Keyword(s):  
Weight Loss ◽  
Uniform Distribution ◽  
Crystalline Phase ◽  
Thermally Stable ◽  
X Ray Diffraction ◽  
Single Crystalline ◽  
X Ray ◽  
Elemental Silver

ABSTRACTReactions of zeolite Na-A with AgI, and the sodium, copper and lead forms of zeolites A, LTA, X and Y with NaI, have been examined as possible starting routes to the long term immobilisation of iodine-129. Heating the salts in air, at 500°C, with the sodium forms of the zeolites leads to the formation of occlusion products, where the iodide salt migrates into the zeolite pores. Detailed studies of the Na-A / 5AgI complex indicate it has a uniform distribution of Na, Si, Al, Ag and I, and is thermally stable to ca. 750°C, where there is a substantial weight loss as iodine is released. In situ powder X-ray diffraction studies have been used to monitor the occlusion reaction at 400°C, and show that the occlusion product decomposes to produce a single crystalline phase at 800°C prior to further decomposition at 850°C to a mixture of nepheline and elemental silver.

scholarly journals Exchange bias effect in single crystalline phase MnO nanoparticles

2013 ◽  
Vol 62 (17) ◽  
pp. 176102
Author(s):  
Luo Yi ◽  
Zhao Guo-Ping ◽  
Yang Hai-Tao ◽  
Song Ning-Ning ◽  
Ren Xiao ◽  
...  
Keyword(s):  
Crystalline Phase ◽  
Exchange Bias ◽  
Bias Effect ◽  
Exchange Bias Effect ◽  
Single Crystalline
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