Transport of alkali metal and alkali earth metal ion against their concentration gradient through 2,3-epithiopyl methacrylate-methacryloyloxyethyl phosphoric acid copolymer membranes

1990 ◽  
Vol 40 (56) ◽  
pp. 769-780 ◽  
Author(s):  
Takamasa Nonaka ◽  
Hiroaki Egawa
Keyword(s):  
Alkali Metal ◽  
Phosphoric Acid ◽  
Concentration Gradient ◽  
Metal Ion ◽  
Earth Metal ◽  
Alkali Earth Metal ◽  
Alkali Earth ◽  
Acid Copolymer

scholarly journals SBA-15 with Crystalline Walls Produced via Thermal Treatment with the Alkali and Alkali Earth Metal Ions

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5270
Author(s):  
Sung Soo Park ◽  
Sang-Wook Chu ◽  
Liyi Shi ◽  
Shuai Yuan ◽  
Chang-Sik Ha
Keyword(s):  
Metal Ions ◽  
Pore Size ◽  
Metal Ion ◽  
Pore Diameter ◽  
Earth Metal ◽  
Silica Matrix ◽  
Alkali Earth Metal ◽  
Alkali Earth ◽  
Large Pore ◽  
Large Pore Size

Crystalline walled SBA-15 with large pore size were prepared using alkali and alkali earth metal ions (Na+, Li+, K+ and Ca2+). For this work, the ratios of alkali metal ions (Si/metal ion) ranged from 2.1 to 80, while the temperatures tested ranged from 500 to 700 °C. The SBA-15 prepared with Si/Na+ ratios ranging from 2.1 to 40 at 700 °C exhibited both cristobalite and quartz SiO2 structures in pore walls. When the Na+ amount increased (i.e., Si/Na increased from 80 to 40), the pore size was increased remarkably but the surface area and pore volume of the metal ion-based SBA-15 were decreased. When the SBA-15 prepared with Li+, K+ and Ca2+ ions (Si/metal ion = 40) was thermally treated at 700 °C, the crystalline SiO2 of quartz structure with large pore diameter (i.e., 802.5 Å) was observed for Ca+2 ion-based SBA-15, while no crystalline SiO2 structures were observed in pore walls for both the K+ and Li+ ions treated SBA-15. The crystalline SiO2 structures may be formed by the rearrangement of silica matrix when alkali or alkali earth metal ions are inserted into silica matrix at elevated temperature.

Rb2SeOCl4·H2O: a polar material among the alkali metal selenite halides with a strong SHG response

2016 ◽  
Vol 45 (44) ◽  
pp. 17723-17728 ◽  
Author(s):  
Qi Wu ◽  
Hongming Liu ◽  
Lei Kang ◽  
Zheshuai Lin ◽  
Xianggao Meng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Alkali Metal ◽  
Earth Metal ◽  
Structure And Properties ◽  
Polar Material ◽  
Alkali Earth Metal ◽  
Alkali Earth

The synthesis, crystal structure and properties of Rb2SeOCl4·H2O, the first polar material among the A–Se–O–X systems (A = alkali metal or alkali-earth metal), is presented. It shows a powder SHG response of 8 times that of KDP.

The remarkable effect of alkali earth metal ion on the catalytic activity of OMS-2 for benzene oxidation

Chemosphere ◽  
2020 ◽  
Vol 250 ◽  
pp. 126211 ◽  
Author(s):  
Chunlan Ni ◽  
Jingtao Hou ◽  
Lei Li ◽  
Yuanzhi Li ◽  
Mingxia Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metal Ion ◽  
Earth Metal ◽  
Benzene Oxidation ◽  
Alkali Earth Metal ◽  
Remarkable Effect ◽  
Alkali Earth
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