Sorbent coated

Grate, J. W. Abraham, M. H., Solubility interaction and design of chemically selective sorbent coatings for chemical sensor and arrays, Sens. Actuators B 1991, 3, 85 111... 

E.J. Houser, T.E. Mlsna, V.K. Nguyen, R. Chung, R.L. Mowery and A. McGill, Rational materials design of sorbent coatings for explosives applications with chemical sensors, Talanta, 54 (2001) 469-485. 

The existing systems can be broadly classified into two groups systems that deal with a gaseous analyte, and systems that deal with the analyte in the liquid phase. To date, the first group is composed solely of thermodenuders, devices that rely on thermally cycled sorption-desorption steps. The second group includes wet diffusion denuder-scrubbers and devices that are cyclically sorbent-coated and washed. 

Diffusion Scrubber Coupled-Ion Chromatography. Over the past decade, ion chromatography (IC) has become the technique of choice for the determination of anions. Even with conventional sorbent-coated de-nuders for acid gases, the actual determination is most commonly conducted by IC. The recognition of this fact led to the coupled DS--IC system (96). The system is shown schematically in Figure 9. Items A through H constitute... 

Gundel, L.A. and D.A. Lane. 1999. Sorbent-coated diffusion denuders for direct measurement of gas/particle partition by semivolatile organic compounds. In Lane, D.A., Ed., Gas and Particle Measurements of Atmospheric Organic Compounds. Gordon and Breach Science Publishers, Amsterdam, pp. 287-332. 

PDMS-DVB is a multiple-component bipolar sorbent coating. PDMS-DVB is commercially available in a film thickness of 65 pm for SPME of volatile, amine, or nitroaromatic analytes for GC analyses or in a film thickness of 60 pm for SPME of amines and polar compounds for final determination by HPLC [137], DVB is suspended in the PDMS phase [135],... 

Although various ways to implement SPME are proposed and are being developed (Figure 2.46), there are two primary approaches to conducting SPME (Figure 2.47) with the sorbent coated on the outer surface of fibers... 

In the fiber mode, the sorbent coated fiber is housed in a microsyringelike protective holder. With the fiber retracted inside the syringe needle, the needle is used to pierce the septum of the sample vial. The plunger is depressed to expose the sorbent-coated fiber to the sample. After equilibrium is reached or at a specified time prior to reaching equilibrium, the fiber is retracted into the protection of the microsyringe needle and the needle is withdrawn from the sample. The sorbent is then interfaced with an analytical instrument where the analyte is desorbed thermally for GC or by solvents for HPLC or capillary electrophoresis. For the in-tube mode, a sample aliquot is repeatedly aspirated and dispensed into an internally coated capillary. An organic solvent desorbs the analyte and sweeps it into the injector [68,130,133]. An SPME autosampler has been introduced by Varian, Inc., that automates the entire process for GC analyses. 

Stir-Bar Sorptive Extraction This technique was developed to overcome the problems related to the very small amount of fiber coating material that is applied in SPME. Stir-bar sorptive extraction (SBSE) utilizes a magnetic rod coated with polymeric sorbent. Such a concept was introduced by Baltussen [92]. The magnetic stir bars have a length of 1 or 2 cm, and the polymer film a thickness of 500 or 1000 pm. The bar provides a large volume of polymer coating and its sorption capacity is much higher than in the conventional SPME method. In this technique, the sorbent-coated stir-bar is exposed directly to the liquid sample. When equilibrium is reached, the stir-bar is placed in the thermal desorber unit and analytes are released into GC. 

Figure 14. Method of holding scissors when cutting a TLC sorbent-coated aluminum sheet...

The hydrogen bond acidic polycarbosilane HC was examined as a sorbent coating for chemical vapor detection by ATR-FTIR. For optimal sensitivity, ATR-FTIR instruments must have physical contact between a sufficient mass of... 

Grate JW, Abraham MH (1991) Solubility interactions and the design of chemically selective sorbent coatings for... 

Grate J. W., Abraham M. H., uWIity bteracdons and the Design of Chonically Sdecdve Sorbent Coatings for Chonical Sensors and Arrays, Sensors AAcnuttors, B 3,1991,8S-111. 

Horiuchi T, Hidaka H, Fukui T, Kubo Y, Horio M, Suzuki K, Mori T (1998) Effect of added basic metal oxides on CO adsorption on alumina at elevated temperatures. Appl Catal A Gen 167 195-202 Houser EJ, Mlsna TE, Nguyen VK, Chung R, Mowery EL, McGill RA (2001) Rational materials design of sorbent coatings for explosives applications with chemical sensors. Talanta 54 469 85 Hsieh HY, Spetz A, Zemel JN (1991) Wide range pyroelectric anemometers for gas flow measurements. In Digest of technical papers of TRANSDUCERS 91. International conference on solid-state sensors and actuators, 24-27 June 1991, San Francisco, CA, pp 38-40... 

Combining IL properties with macromolecular architectures opens manifold potential applications. Tailored PILs have been designed for use as solid electrolytes in electrochemical devices such as lithium-ion batteries. By mixing with low-molecular-weight ILs and lithium salts, the ionic conductivity can be drastically increased without a loss in mechanical stability. Apart from ion conducting materials, additional proposed and already tested PIL applications include selective CO2 adsorption, their use as sorbent coatings in chromatography, catalysis, and the fabrication of optoelectronic devices. ... 

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