For multiple functionalities with nanoparticles, controlled assembly of several types of nanoparticles on a solid substrate is desirable. In this study, we demonstrate the fabrication of a bimodal array of two types of nanoparticles and switching of their sizes and locations by using a mixture of copolymer micelles. In proof of concept, we first synthesized a bimodal array of large gold nanoparticles and small platinum oxide nanoparticles from a mixture of large and small micelles containing precursors of nanoparticles. By switching the location of the precursors, the array was converted to one of large platinum oxide nanoparticles and small gold nanoparticles with the preservation of the order of the array. The methodology demonstrated here can be applied to the fabrication and control of bimodal arrays of nanoparticles with a wide choice of types and sizes for multifunctional arrays of nanoparticles.
We have developed new asymmetric high-T
c superconducting (Bi1.85Pb0.35)Sr1.9Ca2.1Cu3.1O10+
δ membrane
with high efficiency for nitrogen separation from air. This membrane with controlled pore structure can
be prepared by the electrophoretic deposition of colloidal (Bi1.85Pb0.35)Sr1.9Ca2.1Cu3.1O10+
δ nanosheets on
the substrate pellet. The presence of mesopores in the asymmetric membrane plays an important role in
achieving high gas selectivity through the enhancement of magnetic interaction between the superconductor
membrane and oxygen molecules. Also, we have found that the control of experimental factors like the
orientation of magnetic field, temperature, and pressure difference across the sample is of special
importance in optimizing the gas selectivity of the membrane. The present results underscore the
applicability of the superconductor membrane as a gas separation device.
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