Polymer-Controlled Growth Rate of an Amorphous Mineral Film Nucleated at a Fatty Acid Monolayer

摘要: The nucleation and growth rate of an amorphous mineral film at a Langmuir monolayer interface has been observed in situ with X-ray scattering techniques for the first time. We present measurements calcium carbonate film, nucleating fatty acid from supersaturated subphase containing dilute poly(acrylic acid) additive, emulation biogenic mineralizing systems. arachidic molecules were to self-assemble on into untilted structure, one bound Ca2+ ion per 14−25 surfactant molecules, two-molecule planar centered rectangular unit cell lattice constants = 4.38 A b 8.51 A. Subsequently, phase forms beneath monolayer, growing 22 A/h thickness 300 after about 15 h. electron density was 0.7 times that crystalline hexahydrate, suggesting precursor is hydrated open structure. During growth, no chang...