Abstract: Suspensions of magneto-responsive Janus colloids form chains and undergo alignment under the influence of a magnetic field. When the magnetic field is aligned with a light path, light transmission through the sample increases as compared to randomly or orthogonally oriented chains. The emissivity response of this suspension is presented as a function of particle concentration and magnetic field strength. A variation of the Beer-Lambert model and ray-tracing simulations capture the behavior of the experimentally measured difference in intensity between magnetically activated and non-activated Brownian suspensions. Experiments demonstrate up to 25% contrast in transmission of visible light, which may be further optimized through materials selection. Similar experiments when these Janus particle chains are suspended in carbon tetrachloride, demonstrate an emissivity variation in the near infrared of ˜10%.

Abstract: A Differential Scanning calorimetry (DSC) thermal analysis method for the action of an applied electric field includes: step 1, in an experiment module of a differential scanning calorimeter, placing a microelectrode crucible and a reference crucible on corresponding sensors, connecting electrode wires of the microelectrode crucible with a signal generator, setting signal parameters to be output, placing a tested sample in a gap between electrodes, closing a microelectrode crucible lid, and closing the experiment module; step 2, at a temperature-varying stage, measuring a DSC curve of the tested sample under the action of an electric field, and at a reheating stage, measuring a DSC curve of the tested sample with no electric field; and step 3, analyzing the DSC curves in combination with the related theories of dielectrics and thermodynamics, and calculating an electric field intensity of the tested sample and a phase transformation rate of the tested sample.

Abstract: A DSC (Differential Scanning calorimetry) electrode system capable of applying an electric field includes a differential scanning calorimeter, a computer, a signal generator, a self-pressurization liquid nitrogen tank and a reference crucible, wherein the self-pressurization liquid nitrogen tank is connected to the differential scanning calorimeter and used for controlling temperature in real time; the differential scanning calorimeter is connected to the computer and used for transmitting signals and recording experiment results. The DSC electrode system also includes a microelectrode crucible that includes a ceramic crucible, a ceramic crucible cover, welding spots, two electrodes and electrode wires, wherein the two electrodes are respectively fixed in the ceramic crucible; a gap is reserved between the electrodes and used for storing a tested sample; the welding spots are reserved at upper ends of the electrodes.

Abstract: A Differential Scanning calorimetry (DSC) thermal analysis method for the action of an applied electric field includes: step 1, in an experiment module of a differential scanning calorimeter, placing a microelectrode crucible and a reference crucible on corresponding sensors, connecting electrode wires of the microelectrode crucible with a signal generator, setting signal parameters to be output, placing a tested sample in a gap between electrodes, closing a microelectrode crucible lid, and closing the experiment module; step 2, at a temperature-varying stage, measuring a DSC curve of the tested sample under the action of an electric field, and at a reheating stage, measuring a DSC curve of the tested sample with no electric field; and step 3, analyzing the DSC curves in combination with the related theories of dielectrics and thermodynamics, and calculating an electric field intensity of the tested sample and a phase transformation rate of the tested sample.