Microstructure Characterization Of Calcified Tissues By Xrd Using An Area Detector
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1094-DD07-09
Microstructure Characterization Of Calcified Tissues By Xrd Using An Area Detector Alejandro B. Rodriguez-Navarro1, and Antonio G. Checa2 1 Depto. Mineraolgia y Petrologia, Universidad de Granada, ., Granada, 18002, Spain 2 Depto. Estratigrafia y Palleontologia, Universidad de Granada, ., Granada, 18002, Spain
CHARACTERIZATION OF CALCIFIED TISSUE MICROSTRUCTURE BY X-RAY AREA DETECTORS Alejandro B. Rodriguez-Navarro1, Antonio G. Checa2 1
Depto. Mineralogía y Petrología, Universidad de Granada, 18002 Granada, SPAIN; [email protected]; 2
Depto. Estratigrafía y Paleontología, Universidad de Granada, 18002 Granada, SPAIN; [email protected] ABSTRACT Organisms can precipitate a wide array of minerals which they use to build calcified tissues (i.e., bone, mollusk shell, eggshell, coccolith) having highly sophisticated microstructures. The disposition of organic and mineral components building these materials is highly organized from the nano- to the millimeter scale. Their ordered assembly implies selforganization processes accorded in space and time, giving rise to highly sophisticated textured materials. The objective of our work is the study of fundamental processes in biomineralization such as self-organization processes and texture control in biomineral crystal aggregates. To study the order in the arrangement of shell making crystals we used area detectors available today in modern X-ray diffractometers. The 2D diffraction patterns, collected using such detectors, contain detailed information not only about the mineralogy but also about the microstructure characteristics of polycrystalline materials – crystal size, stress, crystallinity and crystallographic-texture. For instance, to understand microstructure development in mollusk shells, we use this type of detector to do microdiffraction analyses combined with high resolution SEM in order to follow the ordering mechanisms of crystals making these biomaterials. INTRODUCTION Calcified tissues (e.g., bone, teeth, mollusc shell, avian eggshell) are composite materials made of a mineral part and an organic matrix which are fully integrated and show a high degree of order at different levels from nano- to millimetre scale [1,2]. The combination of a highly organized rigid mineral part and an elastic organic part confers these materials unique and superior mechanical properties, which makes them ideal models for the development of new materials. However, to reproduce this type of materials in the laboratory, it is necessary first to understand how crystals become organised and what is the role of the organic matrix as well as physic-chemical aspects of crystal growth in the development of well ordered microstructures. To understand these processes, we study in detail the formation of ordered microstructures in
biomaterials. However, microstructure characterization is a highly tedious process when using traditional techniques (i.e., optical or SEM microscopy and image analyses). It is especially impractical in the detailed study of a large number of samples in ord
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