Mechanism of zeolite a nanocrystal growth from colloids at room temperature

Abstract

The formation and growth of crystal nuclei of zeolite A from dear solutions at room temperature were studied with low-dose, high-resolution transmission electron microscopy in field emission mode and with in situ dynamic tight scattering. Single zeolite A crystals nucleated in amorphous get particles of 40 to 80 nanometers within 3 days at room temperature. The resulting nanoscale single crystals (10 to 30 nanometers) were embedded in the amorphous gel particles. The get particles were consumed during further crystal growth at room temperature, forming a colloidal suspension of zeolite A nanocrystals of 40 to 80 nanometers. On heating this suspension at 80°C solution-mediated transport resulted in additional substantial crystal growth.