Tailoring diffuse reflectance of inhomogeneous films containing microplatelets

Slovick, Brian; Baker, John M.; Flom, Z. G.; Krishnamurthy, Srini

doi:10.1063/1.4932576

Cited by 9 publications

(12 citation statements)

References 21 publications

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“…Therefore, they are widely used in architecture, manufacturing, and chemical industry. [27][28][29] It is generally believed that, with high infrared radiation reflectivity, metal has good thermal insulation effect. 30 AgNPs have high infrared reflection efficiency, acid and alkali resistance, antioxidant stability, good biocompatibility, and good antibacterial activity against multidrug-resistant bacteria.…”

Section: Introductionmentioning

confidence: 99%

<p>Multifunctional Coating with Both Thermal Insulation and Antibacterial Properties Applied to Nickel-Titanium Alloy</p>

Liu

Xiao

Hou

et al. 2020

IJN

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Background: With excellent shape memory and superelastic properties, shape memory alloy (SMA) is an ideal actuator, and it can form smart structure for different applications in medical field. However, SMA devices cause apparent thermal damage to the surrounding tissues when it works in vivo, making the application of smart structure that is composed of SMA actuator in vivo is greatly limited. Methods: In this paper, coating (APA) with PLA as the main body to limit the heat conduction, a multifunctional Ag nanoparticles (AgNPs)/polylactic acid (PLA)/Al2O3 was synthesized. The Al2O3 layer was formed by micro-arc oxidation (MAO) and AgNPs were synthesized by silver nitrate and ethylene glycol. Scanning electron microscopy, transmission electron microscope, and Fourier transform infrared spectra were applied to analyze the morphology and characterization of APA coating. The antimicrobial activity, thermal insulation activity, and biocompatibility of APA coating were furtherly explored and verified through animal experiments and immunohistochemistry. Results: With different particle sizes and concentrations of AgNPs, APA multi-functional films were successfully prepared. The Al2O3 layer was closely combined with SMA and formed a porous surface, so the PLA and AgNPs layers can firmly adhere to SMA, thus reducing the release of nickel ions in SMA. AgNPs gave APA coating excellent antibacterial activity and effectively inhibited the growth of Staphylococcus aureus. In addition, coupled with the low thermal conductivity of PLA and Al2O3, AgNPs were tightly anchored on the surface of PLA, which has high infrared reflectivity, making the APA coating obtain good thermal insulation performance. Conclusion: We have successfully prepared the APA coating and obtained the optimum amount of AgNPs, which makes it have good thermal insulation performance, good antibacterial activity and good biocompatibility, which provides a new prospect for the application of SMA.

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Section: Introductionmentioning

confidence: 99%

<p>Multifunctional Coating with Both Thermal Insulation and Antibacterial Properties Applied to Nickel-Titanium Alloy</p>

Liu

Xiao

Hou

et al. 2020

IJN

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“…Composite compacts embedded with low volume fraction of low bandgap semiconductor microparticles, such as silicon or germanium, are predicted to reflect over 80% of NIR solar radiation [11] and up to 65% of blackbody radiation [12]. The strong reflectance is achieved with much lower volume fraction (1%) than compacts of similar thickness containing hBNplatelets at 50% volume fraction [13]. The light interacts with * tapio.ala-nissila@aalto.fi.…”

Section: Introductionmentioning

confidence: 99%

Silica-Silicon Composites for Near-Infrared Reflection: A Comprehensive Computational and Experimental Study

Conley¹,

Moosakhani²,

Thakore³

et al. 2020

Preprint

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Compact layers containing embedded semiconductor particles consolidated using pulsed electric current sintering exhibit intense, broadband near-infrared reflectance. The composites consolidated from nano-or microsilica powder have a different porous microstructure which causes scattering at the air-matrix interface and larger reflectance primarily in the visible region. The 3 mm thick composite compacts reflect up to 72% of the incident radiation in the near-infrared region with a semiconductor microinclusion volume fraction of 1% which closely matches predictions from multiscale Monte Carlo modeling and Kubelka-Munk theory. Further, the calculated spectra predict an improvement of the reflectance by decreasing the average particle size or broadening the standard deviation. The high reflectance is achieved with minimal dissipative losses and facile manufacturing, and the composites described herein are well-suited to control the radiative transfer of heat in devices at high temperature and under harsh conditions.

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“…When the light is reflected back from the diffuse reflector at the rear side, escaped light can be effectively eliminated at the front surface due to the transverse wave vector of the scattering light beyond the light cone of air. This is of great importance for various applications including solar cell, illumination, and many other applications related to light-matter interaction enhancement in devices [ 22 – 24 ]. Nevertheless, similar to many novel functionalities obtained in surface-relief structures and nanoparticle-based structures [ 16 – 24 ], the existing approaches to obtain diffuse reflector heavily rely on the excitations of the scattering of randomly textured surface [ 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Diffuse Reflectance and Microstructure Properties of Hybrid Titanium Dioxide Nanocomposite Coating

Huang

Shen

et al. 2018

Nanoscale Res Lett

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In this research, we studied enhanced diffuse reflectance that can be achieved by excitations of multiple-scattering in a hybrid micro-structured titanium dioxide coating. Conventional approaches to obtain diffuse reflection structure rely heavily on exciting the scattering of randomly textured surface, whereas here, we reveal numerically and experimentally that, besides interface scattering, bulk scattering of ordered-disordered hybrid structure can be also employed to obtain highly efficient diffuse reflector. The diffuse reflectance over the measured wavelength region increases significantly with thickness, while angle and polarization-dependent specular reflections are suppressed. These results show the potential to be used as a highly efficient diffuse reflector or for applications in various advanced fields of photonics related to light extractions and diffusers.

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Tailoring diffuse reflectance of inhomogeneous films containing microplatelets

Cited by 9 publications

References 21 publications

<p>Multifunctional Coating with Both Thermal Insulation and Antibacterial Properties Applied to Nickel-Titanium Alloy</p>

<p>Multifunctional Coating with Both Thermal Insulation and Antibacterial Properties Applied to Nickel-Titanium Alloy</p>

Silica-Silicon Composites for Near-Infrared Reflection: A Comprehensive Computational and Experimental Study

Enhanced Diffuse Reflectance and Microstructure Properties of Hybrid Titanium Dioxide Nanocomposite Coating

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