Nonporous Adaptive Calix[4]pyrrole Crystals for Polar Compound Separations

2021 ◽  
Author(s):  
Dan Luo ◽  
Jinya Tian ◽  
Jonathan L. Sessler ◽  
Xiaodong Chi
Keyword(s):  
Polar Compound

Low Cost Microstructures for Preconcentration of Polar and Non-Polar Organic Compounds

2006 ◽  
Vol 514-516 ◽  
pp. 1250-1254 ◽  
Author(s):  
Lilian Marques Silva ◽  
Roberto R. Lima ◽  
Alexsander T. Carvalho ◽  
Maria Lucia Pereira Silva ◽  
Joana Catarina Madaleno ◽  
...  
Keyword(s):  
Ethyl Acetate ◽  
Organic Compounds ◽  
Ethyl Ether ◽  
Low Cost ◽  
Surface Condition ◽  
3D Structure ◽  
Single Pulse ◽  
Polar Compound ◽  
Polar Organic Compounds ◽  
Adsorption Characteristic

Films produced by plasma polymerization of ethyl ether and methyl or ethyl acetate show good adsorption characteristic for polar and non-polar organic compounds. These films when used in microchannels machined in a 3D-structure present some preconcentration of organic compounds. Therefore, the aim of this work is to investigate the physical-chemical preconcentration mechanisms on this structure. The test molecules used were n-hexane and 2-propanol. Quartz crystal microbalance and mass spectrometry were used to measure preconcentration. Two different procedures for reactant injection on the structure were used: a continuous flow during several minutes or a small amount injected on a single pulse and in a few seconds. The microchannels were also modified by the introduction of small ceramic particles for enhancement of the flow dispersion. It was possible to notice for all films a similar kinetic of retention. The main removal mechanism is adsorption. Although all films can provide the removal of the adsorbents molecules, the most important characteristic for the adsorption and/or retention is the surface condition. Thus, the retention of polar compound can be troubled if a non-polar compound was used previously. The most promising films for retention are ethyl ether and ethyl acetate when n-hexane and 2-propanol are used as test molecules. The results using n-hexane or 2-propanol point out the use of low-cost microchannels for preconcentration development.

Thermodynamics of mixtures containing a very strongly polar compound. 11. 1-Alkanol+alkanenitrile systems

2015 ◽  
Vol 605 ◽  
pp. 121-129 ◽  
Author(s):  
Juan Antonio González ◽  
Fernando Hevia ◽  
Ana Cobos ◽  
Isaías García de la Fuente ◽  
Cristina Alonso-Tristán
Keyword(s):  
Polar Compound ◽  
Thermodynamics Of Mixtures

Temperature controlled formation of polar copper phosphonates showing large dielectric anisotropy and a dehydration-induced switch from ferromagnetic to antiferromagnetic interactions

2018 ◽  
Vol 54 (49) ◽  
pp. 6276-6279 ◽  
Author(s):  
Peng-Fei Wang ◽  
Song-Song Bao ◽  
Xin-Da Huang ◽  
T. Akutagawa ◽  
Li-Min Zheng
Keyword(s):  
Dielectric Anisotropy ◽  
Polar Compound ◽  
Temperature Controlled

The polar compound Cu3(2-cpp)2(H2O)5 (1) converts into non-polar Cu3(2-cpp)2(H2O)2 (2) and Cu3(2-cpp)2 (3), accompanied by a switch from ferromagnetic in 1 to antiferromagnetic interactions in 2 and 3.

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