Study On Growth Of Inorganic Crystal Materials Induced Under Langmuir Films Combined The Dynamic Control

In biomineralization, the controlled nucleation, growth and aggregation of biominerals in organism under the mediation of organic matrices lead to specific morphology, orientation and assemblies of the biominerals, and consequently give them special functions. Now it has been considered the control mechanism of monolayer based on the principle of biomineralization. Influenced by this phenomenon, on the one hand people want to know specific information of the regulatory effect; on the other hand, simulate the processes to get inorganic materials similar to its in living bodies.Langmuir film is one of the most widely used organic templates due to its specific structure advantages in study of biomimetic mineralization. People have used this method to synthesis the great mass of inorganic materials which have special morphology and structural characteristics, but those materials always are single independent crystal and rarely grow into lare-area continuous thin film. In our work, compact large area Zn5(OH)8(NO3)2?2H2O thin films with uniform morphology and well-orientation along the (200) plane were fabricated based the diffusion of a volatile catalyst concentration combined ordered molecular films. By low temperature heat treatment we get compact large area ZnO thin films with uniform morphology. We obtain the materials of fractal structure based on the regulation of system kinetically limited.This paper preliminarily discusses the mechanism of obtained structural materials; it is a novel and feasible method that the growth system of inorganic crystal under controlled conditions of the diffusion of a volatile catalyst concentration combined Langmuir monolayer to synthesis the large-area special structure materials. The work we have carried out was as follows:(1) Cryatallization of Zn(NO3)2 based the diffusion of a volatile catalyst concentration combined BA Langmuir monolayer and ZnO thin film after annealing of its precursor.Behenic acid Langmuir monolayer was used for the template as the usual biomimetic process, and a gradient of vapor-diffusion catalysis was introduced to the system to provide an addition of kinetic control. Kinetically and spatially controlled vapor-diffusion process combined a Langmuir monolayer template, compact Large area Zn5(OH)8(NO3)2?2H2O thin films with uniform morphology and well-orientation along the (200) plane, were fabricated in such a biomimetic system.(2) Study of cryatallization of Zn(NO3)2 based the diffusion of a volatile catalyst concentration combined BSA Langmuir monolayer.Large area, uniform and compact ZnO thin films and its precursor (Zn5(OH)8(NO3)2?2H2O) thin films were fabricated under BSA Langmuir monolayer using biomimetic method. In such a biomimetic system, Protein bovine serum albumin Langmuir monolayer was used for the template as the usual biomimetic process, and a gradient of vapor-diffusion catalysis was introduced to the system to provide an addition of kinetic control. And we considered the control mechanism of monolayer based on the principle of biomineralization. Kinetic control of a gradient of vapor-diffusion catalysis was introduced into the system with the addition of NH4OH. The role of NH4OH in the deposition process was clarified as an agent to establish a gradient of catalyst concentration and control the supersaturation of Zn5(OH)8(NO3)2?2H2O through the formation of complexes.(3) Study of fractal structure of Zn5(OH)8(NO3)2?2H2O based the diffusion of a volatile catalyst concentration combined BA Langmuir monolayerBehenic acid Langmuir monolayer used for the template combined the diffusion of a volatile catalyst concentration; in this system we fabricated the ordered fractal structure with the perfect orientation. And we discussed the possible mechanism of the fractal growth.(4) Synthesis of Li2CO3 crystals using BSA monolayer as templates.Cooperative interaction between Li2CO3 with BSA is the key factor that controlled the Li2CO3 with a complex structure and a well oriented face by biomimetic approach.