ABSTRACT
Fig. 5.1.1 Monodispersed BaS04 spheres prepared by pouring equimolar solutions of BaCh and H2S04 , with a high concentration of HCl contained in both solutions, into a beaker at the same time at 20°C, where 30 cm3 of a BaCh solution (l/18 mol dm-3 in BaCI2 and 10/3 mol dm-3 in HCl) and 30 cm3 of a H2S04 solution (l/18 mol dm-3 in H2S04 and 10/ 3 mol dm-3 in HCl) were used. (From Ref. 1.)
inordertoincreasethefinalparticlesize.Thisisinaccordwiththeruleofsizecontrol ofmonodispersedparticles,sincetheincreaseinsolubilityleadstotheincreaseof thevolumicgrowthratevattheendofthenucleationinthemassbalanceofn= QVmlv,wherenisthefinalparticlenumber,Qisthesupplyrateofthereactantsin moleperunittime,andVmisthemolarvolumeofthesolid.Theyalsofoundthat thefinalsizewasdramaticallydecreasedbyreplacingthewaterincreasinglywith propylalcohol(i.e.,from3J.Lmto-0.3J.Lmwithincreasingproportionofalcohol from0to60vol%).Thisisduetothedecreaseinvbythedecreaseinsolubility ofbariumsulfate.
