Performance enhancement of tapered helical coil receiver using novel nanostructured carbon florets coating

Sharma, Sumit; Sah, Ananya; Subramaniam, Chandramouli; Saha, Sandip K.

doi:10.1016/j.applthermaleng.2021.117065

Cited by 17 publications

(8 citation statements)

References 38 publications

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“…54 The thermoplasmonic polymerization of soybean oil was observed on the bundled AuNR arrays, which ascertains the surface temperature to be at least ∼230 °C (Figure S26). Finally, the thermoplasmonic heat was quantified using the infrared thermometric mapping, 36,55,56 which provides an in situ, direct, and precise estimate of the surface temperature (Figure 6). The bundled AuNRs were irradiated with a 1 W 532 nm CW diode laser in an orthogonal geometry, with the infrared signatures captured at 45°with respect to the substrate.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Insights into the Utilization and Quantification of Thermoplasmonic Properties in Gold Nanorod Arrays

et al. 2022

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Doing chemistry with plasmons is rewarding but is often challenged by the competition between the intriguing relaxation processes in plasmonic materials. One of the currently debated and prominent examples of this is the interference of the thermalization process in bringing out different physicochemical transformations. We present here insights into the utilization and quantification of thermoplasmonic properties in configurable arrays of gold nanorods (AuNRs), which will help in accomplishing the desired outcome from the thermalization process. The plasmonic heat generated in AuNR arrays is used to perform versatile and useful photothermal processes, such as polymerization, solar-vapor generation, Diels−Alder reaction, and crystal-to-crystal transformation. The unprecedented use of thermochromism in quantifying the thermalization process shows that the surface of AuNR arrays can heat up to ∼250 °C within ∼15 min of irradiation, which is independently validated with standard infrared-based thermometric imaging studies. The plasmonic heat reported by the thermochromic studies is the lower limit corresponding to the phase change temperature of the thermochromic molecule, and the actual surface temperature of bundled AuNR arrays could be higher. The choice of reaction conditions is crucial for the effective utilization as well as dissipation of thermoplasmonic heat. The maximum impact of surface temperature was observed when substrates were adsorbed onto the AuNR arrays, whereas the influence of thermoplasmonic heat was minimum when the experiments were performed in a solution state. The insights provided here will have far-reaching implications in the emerging area of plasmonically powered processes, especially in plasmonic photocatalysis.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Insights into the Utilization and Quantification of Thermoplasmonic Properties in Gold Nanorod Arrays

et al. 2022

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“…Furthermore, this strategy effectively utilizes the high diffusion coefficient (0.9 cm 2 /s at 740 °C) of the gas-phase carbon precursors to provide controllable and three-dimensional conformal coating of carbon on the surface of DFNS. Subsequent removal of the template ensures that the resulting NCF is an exact complementary replica of DFNS and thus exhibits large accessible surface areas, tunable porosities, and fiber densities. − The HAADF–TEM images establish complete removal of the DFNS template, providing an all-carbon NCF (Figure S2).…”

Section: Resultsmentioning

confidence: 97%

“…Here, we overcome such traditional and persistent drawbacks of metallic nanostructures by demonstrating 300-fold SPCE enhancements with non-metallic, porous, all-carbon-based nanostructured carbon florets (NCF). − Morphologically, the NCF exhibits a spherically isotropic, three-dimensional arrangement of conically graded microcavities, mimicking the floral assembly of marigold. This results in a large pore volume (0.44 cm 3 /g) and a highly accessible surface area (920 m 2 /g) .…”

Section: Introductionmentioning

confidence: 99%

“…This results in a large pore volume (0.44 cm 3 /g) and a highly accessible surface area (920 m 2 /g) . Structurally, the porous NCF integrates short-range graphitic ordering with long-range domain disorder to result in hard-carbon frameworks for enhanced light entrapment and electromagnetic (EM)-field localization. − Furthermore, the design principles of NCF enable facile access to a wide range of morphologies and porosities, all of which retain the hard-carbon structure. Thus, the role of interfacial light–NCF interactions is discussed to bring about a detailed structure–property-enhancement correlation.…”

Section: Introductionmentioning

confidence: 99%

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Metal–Dielectric Interfacial Engineering with Mesoporous Nano-Carbon Florets for 1000-Fold Fluorescence Enhancements: Smartphone-Enabled Visual Detection of Perindopril Erbumine at a Single-molecular Level

Bhaskar

Thacharakkal

Ramamurthy

et al. 2022

ACS Sustainable Chem. Eng.

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Metallic nanosystems with strong surface plasmon resonance have been a predominant choice for surface plasmoncoupled emission (SPCE), leading to a plethora of sensing and diagnostic applications. The Ohmic losses and strong isotropic scattering of the emissive photons in such systems still remain major challenges that limit the sensitivity, reliability, and magnitude of enhancements. Consequently, rational designing of nonplasmonic dielectric interfaces and their hybrids that suppress these drawbacks without compromising the radiative decay pathways is highly desirable. Here, we present dielectric-based nanostructured carbon florets (NCFs), exhibiting precisely tailored porosities and surface morphologies for enhanced light entrapment, thereby achieving plasmon-free generation of electromagnetic (EM) hotspots. The hard-carbon sp 2 framework of NCF, together with its morphology resembling conical microcavities, thus represents the first all-carbon system, providing 310-fold SPCE enhancements. Such enhancements achieved in cavity configuration present a fundamental departure from those obtained through conventional plasmonic interfaces that work best in spacer and extended cavities. This underlines the importance of the extensive surface area (745.62 m 2 /g) and high absorbance (>0.9) of NCF. Besides showcasing the detailed morphological dependence of SPCE, the NCF also acts as a versatile support for anchoring plasmonic Ag and interfacing with π-plasmon rich GO. Such a multi-component hybrid combines the benefits of several radiative pathways for realizing unprecedented 1000-fold SPCE enhancements. Consequently, this substrate has been utilized for the detection of pathologically important PE at single-molecular attomolar levels (1 × 10 −19 M) with excellent linearity (R 2 = 0.996) and high reliability (RSD: 2.07) over a wide concentration range spanning 16 orders of magnitude (0.1 aM−1 mM). The demonstration of such detection with smartphone-based platforms expands opportunities for the internet-of-things, besides unraveling newer possibilities for metal−dielectric interfacial engineering.

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“…According to the result, a cylindrical cavity with an inverted conical base provides the highest optical efficiency, around 92%, compared to other cylindrical cavities with different base shapes. Sumit et al [15] studied the performance of a tapered helical coil solar receiver with a nanostructured carbon florets coating. The efficiency increases from 48.4% to 68% for a closed cavity receiver at a flow rate of 20 L/min on the application of thermal coating.…”

Section: Introductionmentioning

confidence: 99%

Optical Performance Comparison of Different Shapes of Cavity Receiver in the Fixed Line-Focus Solar Concentrating System

Hai

Song

2022

Sustainability

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To optimize the fixed-focus solar concentrating system (FLSCS) and linear cavity receiver of better optical performance, the effects of receiver parameters (geometric shape, receiver position f, receiver internal surface absorptivity αab, and end reflection plane reflectivity ρr) on the relative optical efficiency loss ηre-opt,loss, the maximum value of the local concentration ratio Xmax, and the non-uniformity factor σnon were studied in the present study. The results showed that the increases of sun declination angle δ in the range of 0–8° have a weak effect on the ηre-opt,loss. The ηre-opt,loss are 2.25%, 2.72%, 12.69% and 2.62%, 3.26%, 12.85%, respectively, when the solar hour angle ω is 0°, 30°, 60° as δ = 0° and 8° for linear rectangular cavity receiver. The Xmax mainly depends on the energy flux distribution of first intercepted sunlight on the cavity absorber inner wall. Increasing the distance between the cavity absorber inner wall and the focal line Δf can affect the Xmax. The smaller the Δf, the greater the Xmax, and vice versa. The changing trend of σnon is basically consistent with that of the Xmax. When the f is 600, 625, 650, 675, 700 mm and the ω = 0°, the σnon are 0.832, 0.828, 0.801, 0.747, and 0.671, respectively, for linear rectangular cavity receiver. This work could establish the foundation for further research on the optical to thermal energy conversion in the FLSCS.

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Performance enhancement of tapered helical coil receiver using novel nanostructured carbon florets coating

Cited by 17 publications

References 38 publications

Insights into the Utilization and Quantification of Thermoplasmonic Properties in Gold Nanorod Arrays

Insights into the Utilization and Quantification of Thermoplasmonic Properties in Gold Nanorod Arrays

Metal–Dielectric Interfacial Engineering with Mesoporous Nano-Carbon Florets for 1000-Fold Fluorescence Enhancements: Smartphone-Enabled Visual Detection of Perindopril Erbumine at a Single-molecular Level

Optical Performance Comparison of Different Shapes of Cavity Receiver in the Fixed Line-Focus Solar Concentrating System

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