Hollow nanostructures of platinum have been synthesized by reducing PtCl2 with alcohol in the presence of selenium nanowires or colloids. The Se template could be removed by soaking the resultant Se@Pt nanostructures in hydrazine or by heating them to 200-250 degrees C. The size and wall thickness of the polycrystalline hollow nanostructures could be controlled by varying the template, reaction time, and the concentration of PtCl2.

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The paper investigates the activities of the eight London Commissions of Sewers during the period 1800–47. It is argued that the criticisms of the Commissions made by Edwin Chadwick and later historians are undeserved. The Commissions were efficient, innovative and honest, and successfully kept pace with the ever-changing sanitary needs of the capital. Although they operated under severe statutory constraints, they constructed many miles of sewer and can be seen as the true instigators of the nineteenth-century sanitary revolution.