arnab is provided with three kinds of liquid out of them one is sodium hydroxide another
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Shaurya is provided with three kinds of liquid sodium hydroxide and other is hydrochloric ... and third is sugar solution how will you identify them when he has only blue Litmus
Answer:
Increasing surface area is the most popular trend for improving the performance of gas sensor materials. The surface-to-volume ratio of 1-D nanostructure is further increased by producing hollow or porous nanostructures. In this regard, a considerable improvement has been achieved in the last few years by developing 1-D nanostructures with hollow or porous nanostructures. So far, hollow nanostructures of SnO2 (58,59), ZnO (60), TiO2 (29), α-Fe2O3 (25), and CdO (61) have been prepared for gas-sensing applications. The key parameters that determine the gas-sensing properties of hollow and porous nanostructures are wall thickness, permeability, and surface morphology of the shell layers (62).
Lee et al. (62) classified the production route of hollow nanostructures in two categories: (1) preparation of hollow nanostructures using templates and (2) preparation of hollow nanostructures without templates. Hollow nanostructures produced by layer-by-layer coating (63) or heterocoagulation (64) requires a template. On the other hand, Paulose et al. (29) synthesized TiO2 nanotube arrays by anodization of 250-μm-thick Ti foil where no template was required (Figure 7).