Introduction

Zhang, Zhuomin M.

doi:10.1007/978-3-030-45039-7_1

Cited by 45 publications

(67 citation statements)

References 90 publications

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“…Here, h is the Planck's constant, k B is the Boltzmann constant, and λ is the wavelength. ε(λ, θ, ϕ, T cooler ) = 1 π R 2π 0 dϕ R π=2 0 ε λ cos θ sin θdθ is the temperature-dependent emissivity of the structure 22 . Here, the emissivity measured at room temperature (298 K) is taken into simulation, since it is assumed that the temperature variations of the structure affect little on emissivity.…”

Section: Discussionmentioning

confidence: 99%

Continuously variable emission for mechanical deformation induced radiative cooling

et al. 2020

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Passive radiative cooling, drawing heat energy of objects to the cold outer space through the atmospheric transparent window, is significant for reducing the energy consumption of buildings. Daytime and nighttime radiative cooling have been extensively investigated in the past. However, radiative cooling which can continuously regulate its cooling temperature, like a valve, according to human need is rarely reported. In this study, we propose a reconfigurable photonic structure, based on the effective medium theory and semi-analytical calculations, for the adaptive radiative cooling by continuous variation of the emission spectra in the atmospheric window. This is realized by the deformation of a one-dimensional polydimethylsiloxane (PDMS) grating and nanoparticle-embedded PDMS thin film when subjected to mechanical stress/strain. The proposed structure reaches different stagnation temperatures under certain strains. A dynamic tuning in emissivity under different strains results in a continuously variable “ON”/“OFF” mode in a particular atmospheric window that corresponds to the deformation-induced fluctuation of the operating temperatures of the reconfigurable nanophotonic structure.

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Section: Discussionmentioning

confidence: 99%

Continuously variable emission for mechanical deformation induced radiative cooling

et al. 2020

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“…The energy equation of the heat transfer process indicates that the heat transfer process is affected by the physical parameters of the fluid, in addition to the comprehensive influence of the temperature and velocity vectors, which suggests that heat transfer in the fluid is affected by the synergistic effect between the velocity and temperature fields [16,17]. At present, the application of field synergy research to the heat transfer mechanism in DPFs remains at the initial stage [18].…”

Section: Influence Of Multiple Fields On Heat Transfer In the Monolithmentioning

confidence: 99%

Synergy Analysis of the Influence of the Connection Cone on the Thermal Distribution during Regeneration

Dou

Aslam³

et al. 2021

Symmetry

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Diesel particulate filters (DPF) are typically used for particle filtration in vehicle exhausts after a treatment system. The monolith inside a DPF is a symmetrical column structure, frequently an axisymmetric cylinder structure where filtration and regeneration occur. Due to the complex structure before the symmetric monolith, the internal particle distribution is not uniform, which leads to an uneven temperature change when regeneration occurs. During thermal regeneration, the temperature field inside a DPF is affected by the particle load, exhaust temperature and exhaust flow. The relationship between the temperature gradient and velocity vector is also a key factor influencing regeneration performance. Based on the particle-loading test method, a bench for thermal distribution testing during regeneration was built. Via experiments and simulations, the temperature field in an axisymmetric monolith during particle combustion given an uneven particle distribution was analyzed. Through field synergy analysis of the temperature and velocity fields in the monolith, the influence of connection cones with different structures on heat transfer enhancement was studied. The results indicated that compared with a monolith with a conventional linear cone, the radial temperature gradient is 1.1 °C/mm lower, the area of enhanced regeneration is larger, and the regeneration rate is improved in the monolith with a streamlined cone.

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“…To induce cavity resonance for photon funneling, a high internal reflection inside the cavity is required. According to Fresnel's equations, a high reflection occurs when the difference of refractive indices of two interface materials is large [24]. Both Si and Au are considered to serve as a coating film for high interreflection, considering the refractive index of PDMS in the visible region is around 1.4, Au with index around 0.3 and Si with index around 4.0.…”

Section: Nanocone Design and Materials Selection For High Field Enhancemntmentioning

confidence: 99%

Design of Inverted Nano-Cone Arrayed SERS Substrate for Rapid Detection of Pathogens

et al. 2021

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Rapid detection of bacteria is a very critical and important part of infectious disease treatment. Sepsis kills more than 25 percent of its victims, resulting in as many as half of all deaths in hospitals before identifying the pathogen for patients to get the right treatment. Raman spectroscopy is a promising candidate in pathogen diagnosis given its fast and label-free nature, only if the concentration of the pathogen is high enough to provide reasonable sensitivity. This work reports a new design of surface-enhanced Raman spectroscopy (SERS) substrate which will provide high enough sensitivity and fast and close contact of the target structure to the optical hot spots for immunomagnetic capturing-based bacteria-concentrating technique. The substrate uses inverted nanocone structure arrays made of transparent PDMS (Polydimethylsiloxane) to funnel the light from the bottom to the top of the cones where plasmonic gold nanorods are located. A high reflective and low loss layer is deposited on the outer surface of the cone. Given the geometry of cones, photons are multi-reflected by the outer layer and thus the number density of photons at hotspots increases by an order of magnitude, which could be high enough to detect immunomagnetically densified bacteria.

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Introduction

Cited by 45 publications

References 90 publications

Continuously variable emission for mechanical deformation induced radiative cooling

Continuously variable emission for mechanical deformation induced radiative cooling

Synergy Analysis of the Influence of the Connection Cone on the Thermal Distribution during Regeneration

Design of Inverted Nano-Cone Arrayed SERS Substrate for Rapid Detection of Pathogens

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