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Carapezzi S.,University of Bologna | Priante G.,CNR Institute of Materials | Grillo V.,Istituto Nanoscienze | Grillo V.,CNR Institute of Materials for Electronics and Magnetism | And 3 more authors.
ACS Nano | Year: 2014

The origin of deflections of semiconductor nanowires (NWs) induced by an electron beam in scanning electron microscopy has been subject to different interpretations. Similarly, the subsequent clumping together of NWs into bundles is frequently observed, but no interpretation has yet been advanced. Here we present results on the bundling of NWs following the intentional bending by an electron beam. Furthermore, we extend the concept of lateral collapse, usually applied to fibrillar architectures mimicking the adhesiveness of natural surfaces (the so-called Gecko effect), to analyze the mechanism of the NW bundle formation. We demonstrate how the geometry of the NW arrays and the mechanical properties of the composing materials govern bundling and how these parameters should be taken into account in the design of NW arrays both for avoiding vertical misalignment when detrimental and for achieving patterning of NW arrays into nanoarchitectures. © 2014 American Chemical Society. Source


Vergara D.,University of Salento | Vergara D.,Laboratory of Clinical Proteomic | Bellomo C.,Istituto Nanoscienze | Zhang X.,Louisiana Tech University | And 8 more authors.
Nanomedicine: Nanotechnology, Biology, and Medicine | Year: 2012

The sonication-assisted layer-by-layer (SLBL) technology was developed to combine necessary factors for an efficient drug-delivery system: (i) control of nanocolloid size within 100 - 300 nm, (ii) high drug content (70% wt), (iii) shell biocompatibility and biodegradability, (iv) sustained controlled release, and (v) multidrug-loaded system. Stable nanocolloids of Paclitaxel (PTX) and lapatinib were prepared by the SLBL method. In a multidrug-resistant (MDR) ovarian cancer cell line, OVCAR-3, lapatinib/PTX nanocolloids mediated an enhanced cell growth inhibition in comparison with the PTX-only treatment. A series of in vitro cell assays were used to test the efficacy of these formulations. The small size and functional versatility of these nanoparticles, combined with their ability to incorporate various drugs, indicates that lapatinib/PTX nanocolloids may have in vivo therapeutic applications. From the Clinical Editor: The efficacy of Lapatinib/Paclitaxel polyelectrolyte nanocapsules is described in this study in cell cultures of multidrug-resistant ovarian cancer. If in vivo studies also result in similar efficacy and low toxicity, this may represent a viable avenue to address such malignancies. © 2012 Elsevier Inc. Source

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