Emissivity of Boron Nitride and Metals for the Solar Probe Plus Mission

Mid-infrared optical properties of pyrolytic boron nitride in the 390–1050 °C temperature range using spectral emissivity measurements

“…In addition to the basic interest of these measurements for the analysis of the discrepancies indicated above, this material shows promising properties in the mid-infrared range that make it attractive for many applications. As noted above, pBN may be an appropriate candidate for the main thermal protection system of the Solar Probe Plus (NASA) [10,31] or, from a broader viewpoint, as a high temperature passive thermal controller. Besides, tunable infrared absorption has also been achieved with a h-BN metamaterial, and it is known that numerical simulations for these applications require accurate values of the temperature-dependent dielectric function [32].…”

“…Besides, tunable infrared absorption has also been achieved with a h-BN metamaterial, and it is known that numerical simulations for these applications require accurate values of the temperature-dependent dielectric function [32]. In order to implement these possible applications, it is necessary to expand the scarce number of published data on the temperature dependence of its optical properties [31,33,34]. The paper also presents the first study on the temperature dependence of the optical constants, Γ phonon frequencies and dielectric properties (high-frequency and static dielectric constants) of pBN samples.…”

An Amphiphilic Surface with Improved Thermal Radiation for Water Harvesting

“…The droplets coalesced on a smaller hydrophilic island can slide off earlier, as the surrounding hydrophobic grooves prevent the droplets from spreading [43]. Figure 2d shows a hydrophobic area with mixed nanoparticles to improve its energy emission abilities [44,45]. The contact angle of droplets on a solid surface was used to evaluate the surface wettability and droplet mobility [42].…”

Hexagonal Boron Nitride Nanosheets Grown via Chemical Vapor Deposition for Silver Protection

“…In comparison, h-BNNS has excellent chemical stability in various aquatic environments . Furthermore, hexagonal boron nitride nanomaterials are noncytotoxic and have higher levels of biocompatibility when compared to their carbon counterparts. − In a recent study, a 130 μm thick h-BN coating was used as a protection layer of a solar probe owing to h-BN’s stability at high temperatures and low ratios of solar absorptivity to the emissivity . All these properties render h-BNNS a desirable protective coating that can be used in harsh environments.…”

“…8−11 In a recent study, a 130 μm thick h-BN coating was used as a protection layer of a solar probe owing to h-BN's stability at high temperatures and low ratios of solar absorptivity to the emissivity. 12 All these properties render h-BNNS a desirable protective coating that can be used in harsh environments.…”