Particles
with circumstance-responsive conductivity have an appealing
performance in constructing sensors. Here, “smart” conducting
polyaniline-doped poly(styrene-co-N-isopropylacrylamide) composite spheres, i.e. PANI/P(St-NIPAM) particles,
are reported. A series of PANI/P(St-NIPAM) particles can be prepared
with different ratios of N-isopropylacrylamide to
monomers, i.e. N/M ratios. With the improved N/M ratios in polymerization,
the amount of polyaniline (PANI) incorporating into the produced particles
increased, resulting in an enhanced conductivity. With the improved
N/M ratios, the hydrodynamic diameters of PANI/P(St-NIPAM) particles
increased at a low temperature, whereas they decreased at a high temperature;
resulting in the enhanced volume-change ability with the increasing
poly(N-isopropylacrylamide) (PNIPAM) content in particles.
Depending on the temperature-induced volume change, these particles
exhibit “smart” conductivity in a homemade device, in
which these particles can be used as a temperature-responsive conducting
medium to construct an “on–off” circuit, and
the switch of an LED lamp can be triggered by temperature. These particles
with the smart conducting property provide wide potential applications
in sensors, microelectronics, energy storage, and other fields.
A tandem reactor module using Au nanoparticles (NPs)-coated glass beads as packing materials is designed and fabricated for the catalytic reduction of 4-NP. Au NPs-coated glass beads are firstly prepared...
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