Electronic transport in nanostructures is often affected by the presence of impurities. Understanding impurity induced disorder has been a major concern in the field of quantum transport for many years. In this talk I will present a calculation of the conductance of a model disordered nanostructure. Namely, tubular-shaped nanowires with repulsive potential barriers at random positions. Our approach is based on the scattering matrix formalism and our results analyzed within the scaling theory of disordered conductors. When increasing the energy the conductance for a big enough number of impurities in the tube manifests the system evolution from the localized to the metallic regimes. Nevertheless, a conspicuous drop in conductance is predicted whenever a new transverse channel becomes propagating. Comparison with the semiclassical calculation leading to purely Ohmic behavior is also made.
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