A power-free single channel microfluidic device was designed for rapid and sensitive detection of cadmium (Cd 2+ ). Unmodified gold nanoparticles (AuNP) colloid was prepared by an electrochemical method to detect Cd 2+ into water upon colorimetric assay and electric resistance. The detection method based on color changes resulted from AuNP aggregation and their impact on surface Plasmon resonance. Colloidal solutions of AuNPs have high extinction coefficients and absorption band in the visible region of the UV-Visible spectrum. Its position depends upon the Au particle size and inter-particles distance. Therefore, a well-designed chemical interaction between the analytic and AuNPs surroundings resulted in aggregates and changes in surface plasmon resonance band position and width that lead to visual detection of Cd 2+ . These visual results could be observed by the naked eye when the mixture color changed from red in blue with Cd 2+ concentration. Optical property's changes with Cd 2+ concentrations in water were studied via UV-Visible spectrometer. Using PDMS surface modified to construct microfluidic device supported to get stable electric resistance values for AuNP colloid and Cd aqueous solution mixture. Electric resistance results accomplished with UV-Visble results could be employed to detect low ion concentrations in water (10 µM) sensitively.
In this research the bond of strontium hydroxyapatite that electrochemical deposited on TiO 2 nanotube with biomimetically hydroxyapatite formed was in vitro investigated .The TiO 2 nanotube synthesised by anodizing titanium metal and Ti-6Al-4V alloy using special electrochemical cell prepared for this perpous, the solution that used consisted from 70% vol. glycerene ,30% vol. water and 1.5 % wt. NH 4 F.Different concentrations of strontium hydroxyapatite (0,50,100)% were electrochemical deposited by using solution consist of Ca(NO 3 ) 2 .H 2 O , (NH 4 ) 2 HPO 4 ,Na(NO 3 ) 2 and Sr(NO 3 ) 2 as required , then the samlpes was calcined at 500 ºC. Then the samples coated biomimaticaly by immersing in concentrated simulated body fluid (SBF×5) for 30 days in order to investigate the formation of naturally hydroxiapatite on them. The samples were calcined at 500 °C in tubular furnace under air atmosphere .The optical microscope ,XRD and SEM tests were achieved for each step ,and FTIR test for electrochemical coated samlples and biomimeticaly coated samples were made .The final result shows that the TiO 2 nanotube is successfully synthesized .The samples that coated with strontium hydroxyapatite (Sr 100% without calcium) achived a good formation of naturally hydroxyatite similar to bone composition than the others samples(that contain 50% Sr or 0% Sr)
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