Mechanism and crystallochemical signature of nano-particle formation by microorganisms

塩津 弘之; Giang, M.*; 仲松 有紀*; 大貫 敏彦; 宇都宮 聡*

no journal, , 

We investigated to understand the effect of pH, coexistent REEs and the functional group of cells surfaces on the crystal chemistry of biogenic nanoparticle formation. These nano-particles were characterized as phosphate containing a series of REEs. The nano-particles at pH 3 had monazite structure, while the particles forming at pH 4 and 5 were amorphous. REE phosphate inorganically synthesized at room temperature revealed crystalline structure (monazite, xenotime or habdophane) depending on the element. Additional inorganic model experiments using the CMC, Ln resin and Cellulose Phosphate, which have the functional groups similar to cell surfaces, demonstrated that the nano-particles precipitated without structure. Based on these data it is suggested that adsorption to the functional groups on the cell surfaces constrain the shape and structure of nanoparticles.