Formation of a 10 A phase with halloysite structure under hydrothermal conditions with varying initial chemical composition

We studied the process of obtaining nanostructured halloysite by varying the parameters for cre-ating the initial composition. The initial composition was synthesized by co-hydrolysis of (C3H7O)3Al , (C2H5O)4Si in the C6H14-NH3 center dot H2O system. Aluminum hydrosilicate with the composition Al2Si2O5(OH)4 was synthesized under hydrothermal conditions (220 degrees C, 2 MPa, 96 h). Particles of plate-like morphology with av-erage length 100 - 200 nm and 60 nm thickness were obtained. The PXRD patterns revealed the presence of two phases. Plate-like kaolinites are found. Also we observed the formation of a halloysite-like phase. Studies of synthesized samples by IR spectroscopy and thermal analysis revealed the presence of organic-modified hydrosilicate with phase transition around 412 degrees C. The resulting phase is promising for studying the processes of adsorption and further exfoliation.