Hydroxyapatite nanoparticulate materials have received a great deal of scientific
attention due to their dental and orthopedic applications but simple strategies to control particle
characteristics (e.g., surface area, shape and size distribution) are still needed. Among several
hydroxyapatite structures, one-dimensional nanoscale materials such as nanowires, nanorods and
nanobelts can be synthesized in the presence of specific surfactants added during synthesis in
order to alter the particle growth. This contribution is aim to explore strategies to obtain one
dimensional hydroxyapatite crystals without the use of surfactants. Particularly, we study the
effect of several variables such as temperature, reaction time and pH on shape and size of
hydroxyapatite crystals produced under hydrothermal conditions. The results obtained show the
formation of hydroxyapatite nanorods as well as some interesting insights about how to control
particle sizes in samples obtained at temperatures between 180 °C and 220 °C. These results
have potential benefits at the time of producing one dimensional hydroxyapatite crystals in a
simple and not expensive way