The cavity wall is an important part of a receiver in determining the efficiency. Using solar selective reflector (SSR) materials with low absorptivity and high thermal emissivity for design one efficient way to improve In this work, we present systematic study optical high-temperature stability performances six different SSR materials: refractory ceramic fiber based substrate material (Fiberfr...

Energy storage is becoming a critical issue due to the diminishing availability of fossil fuels and intermittent nature current renewable energy sources. As result, thermal management (TM) systems have gained significant attention their crucial roles in various industries. Among different TM materials, MXenes, member transition metal carbide/nitride family, emerged as promising material unique ...

In this paper, an incident angle- and polarization-insensitive metamaterial absorber is proposed for X-band applications. A unit cell of the proposed absorber has a square patch at the centre and four circular sectors are rotated around the square patch. The vertically and horizontally symmetric structure of the unit cell enables polarization-insensitivity. The circular sector of the unit cell ...

In part A, the effect of varying short-chain alkyl substitution on the spectroscopic properties of cyanine dyes was examined. Molar absorptivities and quantum yields were determined for groups of pentamethine and heptamethine dyes for which the substitution of the indole nitrogen was varied. For both sets of dyes, increasing alkyl chain length did not significantly change quantum yield or molar...

The aim of this study is to investigate the possibility of a freeform fabrication of porous ceramic parts through selective laser sintering (SLS). SLS was proposed to manufacture ceramic green parts because this additive manufacturing technique can be used to fabricate three-dimensional objects directly without a mold, and the technique has the capability of generating porous ceramics with cont...

The theory, design, simulation, fabrication, and performance of an omnidirectional polarization detector (PD) with two resonances located in the X and Ka ranges based on a metamaterial absorber (MMA) are presented in this paper. The sandwich structure of PD is composed of 0.1 μm periodic "I" shaped patches on the metasurface, a dielectric of 200 μm FR-4 on the interlayer, and a 0.3 μm copper fi...

We propose a scheme for ultra-broadband and polarization-insensitive metamaterial perfect absorber (PA) by utilizing thin metal-insulator-metal (MIM) stack, which is comprised of an array cross-shaped titanium resonators, silica dielectric spacer, opaque slab. The bandwidth absorption (A) > 90% up to 2100 nm, ranging from the visible near infrared region. At wavelength range 400-2500 this shows...

Since the world’s energy demands are growing rapidly, there is a constant need for new systems. One of cleanest, most abundant, and renewable natural resources available solar energy; therefore, development surfaces with high absorption radiation increasing. To achieve best efficiency, such coated spectrally selective coatings, which strongly influenced by pigments resin binders. Spectrally pai...

Abstract In recent planetary exploration space missions, spacecraft are exposed to severe thermal environments that sometimes more extreme than those experienced in earth orbits. The development of advanced control materials and devices together with reliable accurate measurements their thermophysical properties needed for the systems designed meet engineering challenges associated these missio...

Aerosol particles affect the Earth's energy balance by absorbing and scattering radiation according to their chemical composition, size, and shape. It is generally believed that their optical properties could be deduced from the molecular composition of the complex organic matter contained in these particles, a goal pursued by many groups via high-resolution mass spectrometry, although: (1) abs...