Magnetic follower

Weigh 6.0 g of tricresyl phosphate into a 150-ml beaker, add 75 ml of tet-rahydrofuran (THF), and stir the mixture on a magnetic stirrer. Weight 4.0 g of PVC powder onto a folded piece of smooth paper. Adjust the stirring rate so that the vortex of the liquid in the beaker just reaches the magnetic follower and add the PVC powder in a slow stream. Do not allow the solid to coagulate into lumps before it has dissolved. Pour the solution into a screw cap bottle and seal until required. 

Analysis on the high energy side is of course performed by a combination of, at least, two of the already described electromagnetic filters. In Figure 16.3, a configuration consisting of a magnet followed by an electrostatic analyser is illustrated. 

The density of CoNi powder decreases steadily in the 8.5-7.5 g cm-3 range as the mean particle size decreases from 300 to 50 nm. The saturation magnetization follows the same trend. It has been inferred from those measurements that the particles are formed by a metallic, ferromagnetic, nonporous core whose density is close to the bulk value (8.9 g cm-3). This core is coated by an impurity layer whose density and thickness are 4 g cm-3 and 2 nm, respectively.33... 

Fig. 2.17. Driven equilibrium FID (a) — (b) — (c) — (d) — (e) — (a) the sample magnetization following a 90", t, 180°, r. 90° pulse sequence (f) and (g) comparison between the FID signals following repetitive 90 pulses and those following repetitive 90c, r, 180°, r, 90" pulse sequences example 13C FID of enriched carbon tetrachloride, 13CC14.

Efficient stirring in the flasks A and B is provided by means of suitably sized Teflon-covered magnetic followers fitted with half-inch Teflon collars the magnetic stirrer units serve also to further support the apparatus which should be securely clamped to a rack. 

Equip a 100-ml round-bottomed two-necked flask with a magnetic follower bar, a dropping funnel and a thermometer positioned to dip into the reaction mixture. Site the flask in a plastic bowl on a magnetic stirrer unit. Place in the flask a solution of lg (0.0055 mol) of trans-l-ethynyl-3,3,5-trimethylcyclo-hexan-l-ol (Expt 5.41) in 10ml of acetone and add a solution of 1.25 g... 

Figure 4. Effects of ion kinetic energy on the MS/MS of 5-indanol (a) MS/MS obtained on MIKES instrument with 7000 eV translational energy (b) spectrum obtained on hybrid BQ (magnet followed by quadrupole) mass spectrometer 95 eV (c) spectrum obtained with QQ (tandem quadrupole) mass spectrometer at 35 eV...

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