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In this preliminary study, we demonstrate an environmentally friendly process for the green synthesis of gold nanometre scale particles using the leaf extract from an indigenous Australian plant Eucalyptus macrocarpa as both the stabilising agent and the reducing agent. The synthesis process is straightforward, clean and non-toxic. It also has the advantages of being performed at room temperature and does not need complex processing equipment. Formation of the gold nanometre sized particles was confirmed and characterised by UV-visible spectroscopy, X-ray diffraction, transmission electron microscopy and field emission scanning electron microscopy. The antibacterial activity of the synthesised gold particles was also quantified using the sensitivity method of Kirby-Bauer.

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Accepted ManuscriptThis is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Effect of Dilute Gelatine on the Ultrasonic Thermally AbstractA series of nano hydroxyapatite-gelatin composites with different dilute solutions of gelatin concentrations were synthesized by a thermally assisted low power ultrasonic irradiation method.The gelatine hydroxyapatite, (Gel-HAP) nanoparticles were prepared using Ca(NO 3 ) 2 and KH 2 PO 4 in the presence of gelatine in an aqueous solution. The synthesised products were heat treated between 100°C and 400°C. The effect of the addition of gelatin on the nucleation and growth of synthesised nano HAP was investigated. Characterisation was performed using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and Fourier transform infrared spectroscopy (FT-IR). The characterisation results indicate that gelatin has been appended to the nano HAP forming regular spherical shaped crystals of nano sized Gel-HAP.