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Nanobiotechnology, IET

Issue 2 • Date June 2010

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  • Synthesis, stabilisation and characterisation of rhamnolipid-capped ZnS nanoparticles in aqueous medium

    Publication Year: 2010 , Page(s): 29 - 34
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    Capping agents stabilise the size of the nanoparticles in the range of 1-10 nm. Microbial surfactants as capping agents are beneficial replacements for chemically synthesised ones because of lower toxicity. Rhamnolipids are surfactants produced by Pseudomonas aeruginosa, having high affinity for metal ions. In this study, the authors used rhamnolipids for capping ZnS nanoparticles. The capped particles were stabilised in aqueous environment and its characteristics were studied using Fourier transform infrared spectroscopy (FT-IR), small angle X-ray scattering (SAXS), high resolution transmission electron microscopy (HR-TEM) and ultraviolet-visible spectra, fluorescence spectra. The particle Bohr radius was found to be 4.5 nm both by SAXS and HRTEM, thus proving rhamnolipid to be an effective capping agent for the synthesis of uniform nanoparticles. SAXS study not only reveals the particle size and distribution but also its self-affined agglomeration behaviour. This work is a novel method for stabilising nanoparticles in aqueous condition using biosurfactant. View full abstract»

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  • Preparation of degradable polymeric nanocapsules from hyperbranched poly (amine ester) grafted nanosilica templates

    Publication Year: 2010 , Page(s): 35 - 39
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (333 KB)  

    A facile approach for the preparation of degradable crosslinked polymeric nanocapsules with hydroxyl functional groups was developed by polycondensation from the nanosilica templates. The hyperbranched poly (amine ester) grafted silica nanoparticles (SN-HPAE) were crosslinked with hexamethylene diisocyanate (HDI). Then the silica templates were removed by HF etching to produce the degradable polymeric nanocapsules. The inner diameter of polymeric nanocapsules is in the range of 20-100-nm, which is characterised by transmission electron microscopy (TEM). The strategy developed was confirmed with Fourier transform infrared, thermogravimetric analysis and TEM. View full abstract»

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  • Optimal design of microgrooved channels with electrokinetic pumping for lab-on-achip applications

    Publication Year: 2010 , Page(s): 40 - 49
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (799 KB)  

    Various electrokinetic phenomena in microfluidics have been utilised to manipulate microfluids and particles for lab-on-a-chip applications. Microfluidic channels with traditional planar floor configuration designs have limited pumping efficiency due to the fast backward flow over the electrode surface. This study reports optimal design of a microchannel with a microgrooved configuration for conductive fluid transport with alternating current electrothermal actuations. Significant improvements in flowrate are achieved over the planar configurations without additional temperature rises. The frequency and temperature dependences of AC electrothermal (ET) flow are investigated and analysed. View full abstract»

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Aims & Scope

IET Nanobiotechnology covers all aspects of research and emerging technologies including fundamental theories and concepts applied to biomedical-related devices and methods at the micro- and nano-scale.

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