Growth of single crystals of PbBr2 in silica gel

Effects of magnetic field on the gel growth of PbBr2

“…A hydrogel was prepared from reagent grade sodium metasilicate (purity 98%; Na 2 SiO 3 Á 9H 2 O). A stock solution of a density of 1.06 g/cm 3 was prepared by adding 103 ml of distilled water to 50 g of Na 2 SiO 3 Á 9H 2 O [6]. Then, the sodium silicate solution was prepared by diluting the stock solution (7.5 ml) with an equal quantity of water.…”

“…Table 1 shows the experimental conditions for the gel growth. In Experiment 1 described in Table 1, 15 ml of concentrated acetic acid (purity 99.7%) and 6 ml of 1 M Pb(NO 3 ) 2 (purity 99.5%) were mixed with the sodium silicate solution and then agitated with a magnetic stirrer for 2 h [6]. After that, the solution was kept in a test tube (19.3 mm diameter, 45 mm length) with a lid at 298 K for 5 days under a strong magnetic field (5 T), where a gel was formed, as shown by G in Fig.…”

“…Recently, some studies on applying a magnetic field to control the crystal growth process have been carried out and effective results have been obtained [3,4]. The objective of this work is to study PbBr 2 crystal growth on a gel [5,6] under a magnetic field. Gel with oriented structure formed under a magnetic field can be used as the new medium of growing oriented crystal.…”

Structural anisotropy of silica hydrogels prepared under magnetic field

“…Beside optimization of the condition of the crystal growth in silica gels such as [3,4,5,6], the control of the structure of silica gels is a subject of recent studies. The control of the structure has been achieved by the selection of starting materials, pH control of the solvent, solvent exchange during polymerization stage, and aging [7,8,9].…”

Characteristic nanocrystallite growth of PbBr2 in a magnetic field in gel

“…In the present study, 15 ml of concentrated acetic acid (purity 99.7%; Wako Co.) and 6 ml of 1 M Pb(NO 3 [7]. After that, the solution was kept in a test tube (19.3 mm diameter, 45 mm length) with a lid at 298 K for 5 days under no magnetic field (0 T) in experiment 1, where a gel was formed as denoted by G in Fig.…”