Glass capillary system

Severson, R.F., R.F. Arrendale, and O.T. Chortyk Simple conversion of two standard gas chromatographs to all-glass capillary systems J. High Resol. Chrom. Comm. 3 (1980) 11-15. 

Interfacial Tension (IFT) Measurements. All IFT measurements were done using a University of Texas Model 300 Spinning Drop Interfacial Tensiometer. The basic principle is to introduce a drop (about 2 p ) of an oil sample into a glass capillary tube (1.5 mm I.D., 78 mm long) filled with the aqueous medium. The tube is then spun about its main axis. The oil drop will elongate to a length determined by the IFT value of the system. Details of the theory and application can be found elsewhere (15.16). According to the equipment manufacturer, the formula used to calculate IFT value is ... 

Osteoporosis biomarkers, 17 649 Ostromislensky, Ivan, 25 628 Ostwald color system, 7 309 Ostwald glass capillary viscometer, 21 728 Ostwald ripening, 10 124... 

B. Zheng, J.D. Tice, L.S. Roach, and R.F. Ismagilov A Droplet-Based, Composite PDMS/Glass Capillary Microfluidic System for Evaluating Protein Crystallization Conditions by Microbatch and Vapor-Diffusion Methods with on-Chip X-Ray Diffraction. Angew. Chem. Int. Ed. 43, 2508 (2004). 

Figure 2.6 High pressure glass capillary and autoclave system as developed by Ludemann [19] on the basic design of Yamada. The dimensions of the high pressure capillary are inner diameter 1 mm, outer diameter 5 mm, length 35 to 40 mm.

It is common observation that a liquid takes the shape of a container that surrounds or contains it. However, it is also found that, in many cases, there are other subtle properties that arise at the interface of liquids. The most common behavior is bubble and foam formation. Another phenomena is that, when a glass capillary tube is dipped in water, the fluid rises to a given height. It is observed that the narrower the tube, the higher the water rises. The role of liquids and liquid surfaces is important in many everyday natural processes (e.g., oceans, lakes, rivers, raindrops, etc.). Therefore, in these systems, one will expect the surface forces to be important, considering that the oceans cover some 75% of the surface of the earth. Accordingly, there is a need to study surface tension and its effect on surface phenomena in these different systems. This means that the structures of molecules in the bulk phase need to be considered in comparison to those at the surface. 

A more sensitive viscometer than the drop-time glass capillary method is also needed in size exclusion chromatography (SEC) such as the gel permeation chromatographic (GPC) analysis of polymer molecular weight distribution (MWD). In an SEC system, a concentration detector is commonly used for providing the weight concentration profile of the polymer elution curve. 

We also describe the use of different glass capillary columns and different detector systems. 

INLET SYSTEMS FOR CAPILLARY COLUMNS. Capillary column inlet systems must also be considered. Interest in glass capillaries as gas chromatographic columns has been receiving much attention in the last few years as evidenced by a symposium that was dedicated... 

Figure 6.13. Inlet techniques for capillary columns (Hewlett-Packard Co.-Multipurpose glass inlet system). (A) Splitter type. (b) Splittless type with septum purge. ...

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