Effect of ultrasound irradiation on the production of nHAp/MWCNT nanocomposites

Author(s)

Lobo, Anderson O. ^[1] ; Zanin, Hudson ^[2] ; Siqueira, Idalia A. W. B. ^[1] ; Leite, Nelly C. S. ^[1] ; Marciano, Fernanda R. ^[1] ; Corat, Evaldo J. ^[2]

Affiliation

^[1] Univ Vale do Paraiba Univap, Dev Res Inst IP&D, Lab Biomed Nanotechnol, BR-12244000 Sao Jose Dos Campos, SP - Brazil

^[2] Natl Inst Space Res INPE, Associated Lab Sensors & Mat LAS, BR-12227010 Sao Jose Dos Campos, SP - Brazil

• Document type: Journal article
• Source: Materials Science & Engineering C-Materials for Biological Applications; v. 33, n. 7, p. 4305-4312, OCT 1 2013.
• Web of Science Citations: 34

Abstract

Large amounts of nanohydroxyapatite (nHAp)-multiwall carbon nanotube (MWCNT) nanocomposites are produced by two different aqueous precipitation methods. The ultrasonic irradiation (UI) and slow-drip addition under continuous magnetic stirring (DMS) methods were used to investigate the precipitation of nHAp acicular crystals. Calcium-nitrate, diammonium hydrogen phosphate, and ammonium hydroxide were used as precursor reagents. Superhydrophilic MWCNT were also employed. XPS analysis evidences that the functionalized MWCNTs are composed of 18 to 20 at.% of oxygen and that this property influences the nHAp formation. The high surface area of the MWCNT decreases the mean free path of ions, favoring the nHAp formation assisted by UI. The crystallinity was evaluated using the Scherrer equation. Semi-qualitative energy dispersive spectroscopy (EDS) analysis showed that the main components of HAp powders were calcium and phosphorus in the ratio Ca/P around of 1.67. Bioactivity properties of the nHAp/MWCNT-UI nanocomposites could be evaluated after 14 days soaking in simulated body fluid medium. Scanning electron microscopy, EDS, Fourier transform infrared attenuated total reflection spectroscopy, and X-ray diffraction techniques proved that the apatites formed on the surface and to points that the nHAp/MWCNT-UI have potential biological applications. (C) 2013 Elsevier B.V. All rights reserved. (AU)

• FAPESP's process: 11/20345-7 - Study of nanoparticle-incorporated diamond-like carbon films for biomedical applications
• Grantee: Fernanda Roberta Marciano
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 11/17877-7 - Development of new polymeric scaffolds by electrospinning technique with incorporation of vertically aligned carbon nanotubes and nanohidroxyapatite for bone tissue regeneration
• Grantee: Anderson de Oliveira Lobo
• Support Opportunities: Research Grants - Young Investigators Grants