Separation of 3-Biphenylcarboxylic Acid and 4-Biphenylcarboxylic Acid Isomers with Chromatographic Column of Solid β-Cyclodextrin

2016 ◽  
Vol 37 (6) ◽  
pp. 877-881
Author(s):  
Weijiang Zhang ◽  
Yin Tang ◽  
Jiao Xu ◽  
Jing Sun ◽  
Wuke Lang
Keyword(s):  
Chromatographic Column ◽  
Biphenylcarboxylic Acid

New Type of Chromatographic Column

1951 ◽  
Vol 23 (3) ◽  
pp. 428-427 ◽  
Author(s):  
J. M. Miller ◽  
J. G. Kirchner
Keyword(s):  
Chromatographic Column ◽  
New Type

The effect of terminal N-donor aromatic ligands on sensitization and emission of lanthanide ions in Zn2Ln (Ln = Eu, Tb) complexes with 4-biphenylcarboxylate anions

2021 ◽  
Author(s):  
Stanislav N. Melnikov ◽  
Igor Evstifeev ◽  
Stanislav A. Nikolaevskii ◽  
Ivan V. Ananyev ◽  
Evgenia Varaksina ◽  
...  
Keyword(s):  
General Formula ◽  
Molecular Complexes ◽  
Lanthanide Ions ◽  
Biphenylcarboxylic Acid

The systematical series of Zn-Ln trinuclear carboxylate molecular complexes with general formula [Zn2Ln(NO3)(phbz)6(L)2] (Ln = Eu, Gd, Tb; phbz is anion of 4-biphenylcarboxylic acid; L is pyridine, 2,3-lutidine or 2,2’-bipyridine)...

scholarly journals On factors affecting surface free energy of carbon black for reinforcing rubber

2020 ◽  
Vol 9 (1) ◽  
pp. 170-181 ◽  
Author(s):  
Shangyong Zhang ◽  
Ruipeng Zhong ◽  
Ruoyu Hong ◽  
David Hui
Keyword(s):  
Free Energy ◽  
Carbon Black ◽  
Surface Free Energy ◽  
Surface Activity ◽  
Gas Flow ◽  
Influential Factors ◽  
Chromatographic Column ◽  
Factors Affecting ◽  
Carrier Gas Flow

AbstractThe surface activity of carbon black (CB) is an important factor affecting the reinforcement of rubber. The quantitative determination of the surface activity (surface free energy) of CB is of great significance. A simplified formula is obtained to determine the free energy of CB surface through theoretical analysis and mathematical derivation. The surface free energy for four kinds of industrial CBs were measured by inverse gas chromatography, and the influential factors were studied. The results showed that the aging time of the chromatographic column plays an important role in accurate measurement of the surface free energy of CB, in comparison with the influences from the inlet pressure and carrier gas flow rate of the chromatographic column filled with CB. Several kinds of industrial CB were treated at high temperature, and the surface free energy of CB had a significant increase. With the increase of surface free energy, the maximum torque was decreased significantly, the elongation at break tended to increase, the heat generation of vulcanizates was increased, and the wear resistance was decreased.

Pyrolysis gas chromatography of some hydrocarbons

1967 ◽  
Vol 45 (23) ◽  
pp. 2913-2919 ◽  
Author(s):  
Russell Sutton ◽  
W. E. Harris
Keyword(s):  
Gas Chromatography ◽  
Stainless Steel ◽  
Residence Time ◽  
Low Temperatures ◽  
Limited Range ◽  
Chromatographic Column ◽  
Methane Formation ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography

The variables important to the development of pyrolysis gas chromatography as a means of identification of liquids and gases were studied by placing a pyrolysis tube at the inlet of a gas chromatographic column. The pyrolysis conditions can be controlled to limit the formation of methane and to yield the maximum quantities of other products for identification of the parent compounds. Conditions that reduce methane formation are the absence of air, low temperatures, a long residence time, and the use of quartz rather than stainless-steel pyrolysis tubes. There is a limited range of pyrolysis temperatures that permits the formation and observation of all products in a pyrogram.

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