The Interface Structure Analysis Of Wood By Biomineralization

The wood by biomineralization often leads to the formation of the excellent structure natural organic-inorganic composite. Many scholars do many researches in biomineralization in recent years. Through various researches to explore the formation theory and the formation process by biomineralization and to provide a new theory and design for artificial synthesize new materials.This research took the interface structure analysis of wood by biomineralization as a key point. We used the SEM-EDAX and XPS to analyze the crystal morphology and bonding of interface structure in the Acronychia Pedunculata and the Eucalyptus Citriodoroa.Research conclusions as follows:(1) The biominerals in the Acronychia Pedunculata is SiO₂, which shape is a cauliflower and typical coarse grains, most occurs in their ray parenchyma, and occasionally appears in the longitudinal parenchyma. The biominerals in the Eucalyptus Citriodoroa are CaCO₃ and CAC₂O₄. The biominerals of CaCO₃ is typical 10 bicharacteristic cone, the upper half is the cone but under the half is a kind of square rectangle type and double cone. The biominerals occurs in the ray parenchyma, in the chambered parenchyma and in the longitudinal parenchyma.(2) Each individual ray parenchyma and the longitudinal parenchyma only have a silica group in the Acronychia Pedunculata. We didn't find any silica squeezing the ray parenchyma and the longitudinal parenchyma, silica can grow continually. The wood parenchyma has one or more biominerals in the Eucalyptus Citriodoroa. We found that the biominerals squeeze the ray parenchyma and the longitudinal parenchyma in different height, the parenchyma is steric hindrance with crystal.(3) The XPS analysis confirmed that the silicon combines with inorganic macromolecules in the Acronychia Pedunculata absorbing silicon process, and it exists in the Acronychia Pedunculata by the form of SiO₂. It confirmed that the Acronychia Pedunculata exists Si-O-C.(4) The XPS analysis indicated the Eucalyptus Citriodoroa has Ca-O-C, which the formation of crystals is CaCO₃ and CAC₂O₄ in the Eucalyptus Citriodoroa. Through argon ion sculpture analysis, it indicated that the Eucalyptus Citriodoroa produces the oxygen-containing groups (OH, C=O, COOH) in the calcium absorption process, which is advantage to form CaO-C.We also used the principle of biomineralization to prepare wood-SiO₂ composite. Poured and injected the Camptotheca Acuminata Decne with the artificial silicon solution, the trees grows well. As the XPS analysis shown, Silicon minerals is successfully absorbed by the tree. Silicon combines with inorganic macromolecules in the process of the Camptotheca Acuminata Decne absorbing silicon by SiO₂. The wood in the process of absorption of minerals produces the oxygen-containing groups, which is advantage to form Ca-O-C and form SiO₂ in the tree cells finally.The study of the wood organic-inorganic interface structure by SEM and XPS found a hedging point from the research in the wood biomineralization mechanism and wood traditional modification to wood biological modification, and also provided the experimental evidence and theoretical basis for accessing the wood-inorganic composite formation mechanism by biomineralization. Moreover, it provided the scientific basis for improvement with biomaterials by using the physical technology and methods to extract the biomaterials information. It also is a good method.