Sampling glass plate

Disclinations in tire nematic phase produce tire characteristic Schlieren texture, observed under tire microscope using crossed polars for samples between glass plates when tire director takes nonunifonn orientations parallel to tire plates. In thicker films of nematics, textures of dark flexible filaments are observed, whetlier in polarized light or not. This texture, in fact, gave rise to tire tenn nematic (from tire Greek for tliread ) [40]. The director fields... 

Oil Absorption. The Gardner mb-out (ASTM D281) method is used for this evaluation. A 5-g sample of mica is placed on a smooth glass plate, and linseed oil is added by drops. The mica is constantiy mixed while the oil is being added. The end point is reached when the mica becomes saturated with oil. The amount of oil per 45.4 kg of mica is calculated as follows ... 

Phenylurea and A-phenyl-carbamate residues Apply sample solution, overspot with 7% methanolic potassium hydroxide, cover the start zone with a glass plate and heat to 170°C for 20 mm Primary arylamines are produced [41]... 

Digitalis glycosides Apply the sample solution as a band, then cover the layer, apart from the application zone, with a glass plate and place it in an ammonia chamber for 24 to 48 h, remove excess ammoma and chromatograph Acetyl groups are split off [37]... 

Digitalis glycosides Apply sample solution as band and then luizyme solution over it if necessary, moisten the application zone with water. Cover the layer, except for the application zone, with a glass plate and incubate at 39 °C for 2 to 5 h. [37]... 

Treat the sample for 30 to 40 imn with sodium hydroxide solution (c = 1 mol/1) at 80 °C Apply sample solution and then 0 2% dansyl chloride over It Cover with a glass plate and allow to react in the dark at room temperature for 60 mm, then chromatograph... 

Apply sample solution to silica gel layer, cover with a glass plate, heat to 160 C for 25 mm and allow to cool After this hydrolysis apply 0 2% dansyl chlonde in acetone, cover with a glass plate and store in the dark for 1 h, then chromatograph... 

HPTLC plates Silica gel 60 F254 (Merck) before the samples were applied these were immersed for 4 h in 2-propanol and then dried for 30 min at 110 °C. After cooling in the desiccator the layers were protected from atmospheric moisture by covering them 1 cm above the start zones with a glass plate. 

HPTLC plates Silica gel 60 F254 (Merck) before application of the samples the layers were washed by immersing them for 4 h in 2-propanol, then dried at 110°C for 30 min, before being stored over silica gel in a desiccator. When the samples were being applied the layer above the application zone was covered with a glass plate to avoid adsorption of moisture from the atmosphere. 

Apply bands of sample solution containing ca [36, 37] 25 ig glycoside, cover the layer, apart from the application zones, with a glass plate and place in a chamber over the vapors of 37% hydrochlonc acid, allow to react and chromatograph after the removal of excess hydrochlonc acid... 

FIGURE 5.16 Template scheme (top view) for solid phase sample application (SPSA) and process of performance (cross section of steps a to e) 1 — base of the device, 2 — glass plate, 3 — adsorbent layer, 4 — sample, 5 — top of the device, 6 — plunger to compress. Step a Template placed onto the preparative plate Step b Marking by means of a thin needle Step c Scraped out channel on the preparative plate Step d Filling in of the prepared mixture of sample and deactivated adsorbent Step e Compression by means of a plunger. (From Botz, L., Nyiredy, Sz., and Sticher, O., J. Planar Chromatogr, 3, 10-14, 1990. With permission.)... 

Because a wide variety of TLC plates are available commercially, the most appropriate type of plate should be chosen considering several important factors such as the efficiency of the resolution of the lipid species of interest, cost of the plate, the size of the sample to be applied on the plate, and commercial availability of PTLC, depending on the amount of material to be separated. Silica plates are most commonly used for the analysis of hpids. If a large amount of sample material is needed to be separated, plates with a thicker layer of silica should be used. Commercial PTLC plates are available, and thicknesses of 200 to 2000 pm and 250 to 1000 pm are most commonly used in PTLC. Silica-coated glass plates can be of various sizes ... 

The cured polymer samples used for physical property testing were prepared by photocuring 12 mil thick sheets of degassed and photosensitized monomer mixtures, using a mold composed of glass plates lined with polyester film and separated by a double thickness of vinyl electrical tape. A GE sunlamp was used for Illumination, and Darocure 1173 (E. Merck) was used as the photoinitiator. Hydrocarbon monomers were used as received from the manufacturers. All the vinyl group-containing compounds were stored at -5°C until use. 

For NMR spectroscopic experiments, a thin film of pTrMPTrA was prepared by reacting a quantity of monomer and photoinitiator confined between glass plates with 1 mm separation. The polymerization conditions were the same as those for the photocalorimetry experiments. After 1 hour of UV exposure, the film was removed from the plates and ground to a fine powder using a mortar and pestle. A solid-state 13C NMR spectrum of the powder was obtained immediately, as described below. The remaining polymer powder was divided into two portions, one of which was stored under atmospheric conditions. The other portion was stored under N2. After one week, 13c spectra were again obtained for each of these polymer samples. Both samples were then heated to 280 °C in a vacuum oven and analyzed once more by 13C NMR spectroscopy. 

Oligomer and Film Characterization. Brookfield viscosity measurements were taken on a Model RVTD digital readout viscometer. Samples for Instron testing were prepared on glass plates using 25 or 75 pm (1.0 or 3.0 mil) Byrd film applicator. Coatings for cure speed and MEK double rub (MEKDR) studies were prepared on aluminum Q-Panels using a 40 wire wound rod (100 pm or 4.0 mil). 

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