Infrared Emission Spectroscopy

Mink, J.

doi:10.1002/0470027320.s3003

Cited by 3 publications

(7 citation statements)

References 39 publications

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“…where ( , ) BB I K T is the thermal radiation spectrum from a perfect blackbody. Thus, given a reference sample with a known emissivity such as the black soot, one can calculate ( , ) m K T and () det bK by measuring the emitted spectrum at two different temperatures 1 T and 2 T , and solving the system of two equations. In our measurement, however, this is unnecessary because (…”

Section: S K T M K T K T I K T B Kmentioning

confidence: 99%

“…wavenumber or wavelength. Since an FTIR yields spectra with constant resolution in wavenumber [1], we choose to use wavenumber units (which are equivalent to frequency units since K = f/c). Furthermore note that the above analysis method is applicable only to samples that are smooth (any roughness must be on a substantially smaller scale than the wavelength of emitted light), which is the case for our VO 2 /sapphire sample.…”

Section: S K T M K T K T I K T B Kmentioning

confidence: 99%

“…There is substantial interest in engineering () K  for applications ranging from incandescent light sources [2] to heat management [3] [4] [5] to thermal tagging and imaging [6]. In determining () K  for various materials and structures, frequent use is made of Kirchhoff's law of thermal radiation which states that the emissivity of an object () K  is equal to its frequency-dependent absorptivity () aK [1]. One approach to engineering () K  has been to select materials with appropriate material dispersion to achieve selective thermal emission [7].…”

mentioning

confidence: 99%

“…1). As a reference, we replaced the sample with black soot [1], deposited onto a gold-coated silicon wafer using a candle (deposition time > 10 minutes). After deposition, the soot-coated wafer was baked at 200° C for 30 minutes to remove any excess paraffin from the candle.…”

mentioning

confidence: 99%

“…where I is the spectral radiance (or the spectral radiant energy density), K = f/c is the wavenumber, T is the temperature expressed in Kelvin, h is Planck's constant, c is the speed of light in vacuum, k b is the Boltzmann constant, and () K  is the frequency-dependent emissivity [1]. More specifically, the spectral radiance is the radiant power emitted from a unit area of the source per unit solid angle, in the wavenumber interval from K to K + dK, and has units of W cm -1 .…”

mentioning

confidence: 99%

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Vanadium Dioxide as a Natural Disordered Metamaterial: Perfect Thermal Emission and Large Broadband Negative Differential Thermal Emittance

et al. 2013

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We experimentally demonstrate that a thin (~150 nm) film of vanadium dioxide (VO 2 ) deposited on sapphire has an anomalous thermal emittance profile when heated, which arises due to the optical interaction between the film and the substrate when the VO 2 is at an intermediate state of its insulator-metal transition (IMT). Within the IMT region, the VO 2 film comprises nanoscale islands of metal-and dielectric-phase, and can thus be viewed as a natural, disordered metamaterial. This structure displays "perfect" blackbodylike thermal emissivity over a narrow wavelength range (~40 cm -1 ), surpassing the emissivity of our black soot reference. We observed large broadband negative differential thermal emittance over a >10 °C range: upon heating, the VO 2 /sapphire structure emitted less thermal radiation and appeared colder on an infrared camera. We anticipate that emissivity engineering with thin film geometries comprising VO 2 will find applications in infrared camouflage, thermal regulation, infrared tagging and labeling.Thermal radiation is light that is emitted by an object at a temperature above absolute zero. The spectrum and intensity of thermal radiation emitted by an object is a function of its temperature and emissivity, which is in general frequency (f) dependent. This is expressed by:

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Section: S K T M K T K T I K T B Kmentioning

confidence: 99%

Section: S K T M K T K T I K T B Kmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Vanadium Dioxide as a Natural Disordered Metamaterial: Perfect Thermal Emission and Large Broadband Negative Differential Thermal Emittance

et al. 2013

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Vibro-Polaritonic IR Emission in the Strong Coupling Regime

et al. 2017

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The strong coupling regime of light–matter interaction has recently been extended to IR active molecular vibrations coupled to microcavities, resulting in the formation of so-called vibro-polaritonic states. Here we demonstrate the emissivity of such hybrid states. Using thermal excitation, we achieve polaritonic IR emission from a strongly coupled polymer. Thermal excitation of vibro-polaritons, thus, constitutes an original way of establishing sizable excited-states populations in strongly coupled systems and opens new routes to the study of interacting vibro-polaritons.

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Fumed nanosilica as filler for semi-rigid palm oil-based polyurethane foam: Mechanical, material, thermal, and fire response

Dzulkifli,

Majid,

Ghazali

et al. 2024

Cellular Polymers

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Incorporating nano-sized fillers into bio-based polyurethane (PU) foams typically enhances their properties. In present investigation, palm oil-based PU foams are fabricated with varied loadings (0 to 5 wt%) of fumed nanosilica. The foams are then characterized for their fire-retardancy, thermal stability, foam morphology, and also mechanical properties. Marginal improvement in Limiting Oxygen Index (LOI) values, as well as failure to be rated under UL-94 Vertical Combustion Test indicate limited potential of fumed silica in improving flammability of organic polymeric foams; suggesting exorbitant amount is required for any distinguishable effect to manifest. Interestingly; results from Thermogravimetry Analysis (TGA) shows marked improvements in terms of char residue with more than seven-fold increase at 5 wt% filler loading, possibly owed to the inert filler nature of fumed nanosilica forming a char barrier and acting as fuel diluent. Filled PU foams displayed an increased open-cell content, likely because the filler functioned as a cell opener. Removing the influence of density, the normalized compressive properties showed notable improvement up until a certain loading, which could be credited to the increased stiffness imparted by the filler itself. The results portray the potential of fumed nanosilica as filler for bio-based PU foams, offering enhanced thermal stability and limited fire retardancy.

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Infrared Emission Spectroscopy

Cited by 3 publications

References 39 publications

Vanadium Dioxide as a Natural Disordered Metamaterial: Perfect Thermal Emission and Large Broadband Negative Differential Thermal Emittance

Vanadium Dioxide as a Natural Disordered Metamaterial: Perfect Thermal Emission and Large Broadband Negative Differential Thermal Emittance

Vibro-Polaritonic IR Emission in the Strong Coupling Regime

Fumed nanosilica as filler for semi-rigid palm oil-based polyurethane foam: Mechanical, material, thermal, and fire response

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