Glass holders

A good alternative to burning candles is electronic candles — really LED lights that run on rechargeable batteries. The lights flicker just like normal candles and, because they re encased in a clouded glass holder, they still provide something like the cozy atmosphere of real candles. See also entry 167-... 

After all the tests, the platinum wire should be cleaned with concentrated hydrochloric acid. It is a good plan to store the wire permanently in the acid. A cork is selected that just fits into a test-tube, and a hole is bored through the cork through which the glass holder of the platinum wire is passed. The test-tube is about half filled with concentrated hydrochloric acid so that when the cork is placed in position, the platinum wire is immersed in the acid. 

Fusion and solution of a melt may be conducted either in a platinum wire loop or in a platinum spoon (0-5-1 ml capacity) attached to a heavy platinum wire and fused into a glass holder. 

Ground-glass holders are used by many glassblowers. The extra thickness of glass helps to prevent the ground surfaces being overheated and strained, or even deformed by melting. 

Air samples were taken in a central location of the crawl space, the kitchen, and a bedroom with personal-type air samplers (10). Polyurethane foam plugs (2 cm od. by 3 cm) contained in a glass holder were attached to the sampler. A 2-h sample was taken at a flow rate of 2.8 L of alr/mln. The holder and foam were removed, placed in plastic bags, and stored at -20C until analyzed. 

Figure 17.9 X-ray diffractogram of a bacterial cellulose membrane. The sample was supported on a borosilicate glass holder.

The CE of the experimental cell is a stainless steel strip connected to a Cu ring surrounding the external perimeter of the Teflon container. Electrical connection to the CE is made through carbon brushes pressed against this Cu ring. The RE is placed in a glass holder equipped with a salt bridge, which connects to the main electrolyte. Both the platen and the polisher head are rotated at the same velocity (80—100 rpm). 

Chemical Functionalization. Preparation of Si-lanized Samples. Prior to silanization, the titanium-coated glass cover slips were first pretreated by water—vapor—plasma cleaning (0.42 mbar, 2 min) and then dried in a vacuum for 1 h. Three hundred samples of Ti were incubated using a self-fabricated glass holder in 200 mL of dry toluene containing 2 mL of APTE S (43 mM) at 80 °C for 48 h. After reaction, the substrates were ultrasonicaUy washed with chloroform five times, acetone twice, and methanol five times, and were extensively rinsed with water, then dried in a vacuum, and cured at 100 C under N2 for... 

Fixed volume pipettes of 100 nL and 200 nL are available in the form of platinum-iridium capillaries melted in a glass holder. Repeatability of the volume dispensed by such a nanopipette is very good (< 1 %), but the absolute volume accuracy is only about 5%. This means that for quantitative analysis, all samples and calibration standards on one plate must be applied with the same nanopipette unless calibration is by internal standard. 

Poly(methyl methacrylate) sheet was cut into dumbbells, internal stresses were relaxed at about 130°C, and the samples were placed vertically into a sealed evacuated glass holder and irradiated at 1 to 3 Mrads. i ... 

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