Fabrication of Hydroxyapatite Nanofibers with High Aspect Ratio via Low-Temperature Wet Precipitation Methods Under Acidic Conditions

Masahiro Okada,Emilio Satoshi Hara,Takuya Matsumoto

doi:10.1007/978-981-13-1002-7_22

Abstract

HAp nanofibers (or whiskers) have been attracted considerable attention for their application as adsorbents and reinforcing fillers owing to their unique morphologies. However, fabrication of HAp nanofibers has been limited to high-temperature and/or long-term methods. Herein, we report that HAp nanofibers with more than 5 μm in length (aspect ratio >100) can be easily obtained by a simple wet precipitation method without additives at relatively low temperature (80 °C) under acidic conditions (initial pH of 6.5 and final pH of 3.9), without pH control during the precipitation.

Highlights

Hydroxyapatite (HAp) is recognized as a major inorganic component of human hard tissues
We report that HAp nanofibers could be obtained by a simple wet precipitation method without additives at relatively low temperature (80 °C) under acidic conditions, without pH control during the precipitation
morphology observation by scanning electron microscopy (SEM) using a JSM6701F microscope (JEOL Ltd., Tokyo, Japan) operated at 5 kV or the sample was dried on a collodion-coated grid before particle morphology observation and electron diffraction measurement by transmission electron microscopy (TEM) using a JEM-2 100F microscope (JEOL Ltd.) operated at 200 kV

Summary

Introduction

Hydroxyapatite (HAp) is recognized as a major inorganic component of human hard tissues (bones and teeth). We report that HAp nanofibers could be obtained by a simple wet precipitation method without additives at relatively low temperature (80 °C) under acidic conditions, without pH control during the precipitation.

Results

Conclusion