PREPARATION OF SILVER BROMIDE EMULSION GRAINS BY BELOUSOV-ZHABOTINSKYREACTION ON CONTINUOUS ADDITION OF SILVER-NITRATE SOLUTION

In the Belousov-Zhabotinsky reaction system bromide ions are generated periodically. When AgNO3 solution was added to this system, AgBr grai ns were prepared and the periodical pBr oscillation was sustained duri ng addition of the solution. In previous research we added drops of Ag NO3 solution synchronously to the pBr oscillation. This time we added AgNO3 solution by continuous flow and observed the pAg (pBr) oscillati on and grain shapes. The periodical pAg oscillation was also sustained . At some addition rates, dendrite grains with four, five, six, or eig ht long branches were formed. In some grains, secondary nucleation too k place on the surface of branches and many warts aligned. We believe that the grain corners grew preferentially.