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Abstract
X-ray photoelectron spectroscopy (XPS) was measured for the dry body of hydroxyapatite
(HAP)-collagen (COL) nanocomposites cross-linked using glutaraldehyde (GA). Survey
scan XPS showed the elemental spectra of N, C, O, Ca and P, which came from HAP and
COL. The covalent bond formation between Ca2+ of HAP and RCOO- of COL molecule was
confirmed by XPS. The bridge formation between COL fibers could be assessed from C1s
and N1s band spectrum. The dehydration of swelling water during drying led to the
reduction of linking distance for pendant GA between COL fibrils and contributed to
further cross-linkage reaction. Cross-linkage induced the enlargement of length scale
unit of COL. The modification of length scale was doing the key role of structure
manipulation in the cross-linked HAP-COL nanocomposites.