The Use of Dow Corning 200 Silicone Fluid to Reduce Progressive Peak Broadening on a Gas Chromatographic Column

1967 ◽  
Vol 5 (11) ◽  
pp. 588-589 ◽  
Author(s):  
L. I. Braddock ◽  
N. Marec
Keyword(s):  
Chromatographic Column ◽  
Silicone Fluid ◽  
Peak Broadening

scholarly journals The Mechanisms behind Peak Broadening in a Gel Chromatographic Column.

1974 ◽  
Vol 28a ◽  
pp. 753-763 ◽  
Author(s):  
Torben Smith Sørensen ◽  
O. Mønsted ◽  
Maria del Rosario Casteleiro Soto ◽  
Stig Rundqvist ◽  
Alf Bjørseth ◽  
...  
Keyword(s):  
Chromatographic Column ◽  
Peak Broadening

Specific detection of primary amines in the effluent of a gas-chromatographic column by on-line measurement of fluorescence.

1980 ◽  
Vol 26 (10) ◽  
pp. 1480-1483 ◽  
Author(s):  
F Chow ◽  
A Karmen
Keyword(s):  
Liquid Chromatography ◽  
Chromatographic Column ◽  
Detection Methods ◽  
Primary Amines ◽  
Gas Liquid Chromatography ◽  
Flame Ionization ◽  
Peak Broadening ◽  
Hydrogen Flame ◽  
Primary Amino ◽  
Liquid Chromatographic

Abstract Compounds with primary amino groups react with o-phthalaldehyde in solution to yield highly fluorescent products. This reaction is now in wide use for detecting amino acids and amines in liquid-chromatography effluents. We report here a method for using o-phthalaldehyde to detect primary amines in the effluent of a gas-liquid-chromatographic column. The effluent gas, nominally 20 mL/min, is delivered to a scrubber consisting of a small-bore, simulated capillary chromatographic column that is simultaneously supplied with 1 mL/min of the reagent solution. The liquid effluent of the scrubber, separated from the gas, is drawn through the flow cell of a fluorometer. Short-chain amines and ammonia were quantitatively scrubbed. The response of the fluorometer was directly proportional to the number of nanomoles injected into the column. Less than a nanomole of amine was detectable. Comparison of results with those from a hydrogen flame-ionization detector showed minimal additional peak broadening or compromise of resolution. These results demonstrate the feasibility of using highly specific, as well as sensitive, liquid-chromatographic detection methods for gas-liquid chromatography.

Approaches to characterise chromatographic column performance based on global parameters accounting for peak broadening and skewness

2010 ◽  
Vol 1217 (14) ◽  
pp. 2147-2157 ◽  
Author(s):  
J.J. Baeza-Baeza ◽  
S. Pous-Torres ◽  
J.R. Torres-Lapasió ◽  
M.C. García-Álvarez-Coque
Keyword(s):  
Chromatographic Column ◽  
Peak Broadening ◽  
Global Parameters ◽  
Column Performance

Technical notes on routine TEM procedures

1987 ◽  
Vol 45 ◽  
pp. 630-631
Author(s):  
K. Chien ◽  
R.L. Van de Velde ◽  
R.C. Heusser
Keyword(s):  
Epoxy Resins ◽  
Pathology Laboratory ◽  
Silicone Fluid ◽  
Image Position

Sectioning quality of epoxy resins can be improved by the addition of a 1% silicone 200 fluid (Dow Corning), however this produces a softer block. To compensate, a harder plastic has been used for embedding various tissues encountered in our pathology laboratory. Exact amounts of the plastic mixture can be directly made up for embedding as shown: The chart reveals a Poly/Bed 812 (WPE 145) to anhydride ratio of 1:0.7 and a NMA to DDSA ratio of 7:3. 1% silicone fluid is added to above mixtures.Due to impurities within the DDSA and NMA, the polymerized epoxy blocks vary in darkness and appear to affect sectioning quality. After discussing this problem with Polysciences Inc., they have agreed to purify their anhydrides in an effort to standardize the consistency of the plastic.

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

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.

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