Kubelka-Munk Optical Coefficients for a Barium Sulfate White Reflectance Standard

Gillespie, James B.; Lindberg, James D.; Laude, Larry S.

doi:10.1364/ao.14.000807

Cited by 19 publications

(10 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The diffuse reflectance (DR) spectra of the samples (λ = 250–800 nm) were measured using a JASCO‐V650 UV–Vis spectrophotometer equipped with an integration sphere (ILV‐724). To obtain the band gap energies, the reflectance data were converted to F(R) values according to the Kubelka–Munk theory 62 . The band gaps were obtained from the plot of (F(R)E) 1/2 versus energy of the incident light.…”

Section: Methodsmentioning

confidence: 99%

Investigation of the applicability of TiO₂, BiVO₄, and WO₃ nanomaterials for advanced photocatalytic membranes used for oil‐in‐water emulsion separation

Santos

Ágoston

Kertész

et al. 2020

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

In the present study, a commercial TiO 2 , several BiVO 4 photocatalysts, a WO 3 nanomaterial, and their composites were used to prepare photocatalytic polyvinylidene fluoride (PVDF) ultrafilter membranes. Their photocatalytic activities and the effects of coatings on the filtration of oil-in-water emulsion (crude oil; c oil = 100 mg L −1) were investigated. Fluxes, filtration resistances, purification efficiencies, and fouling resistance abilities-like flux decay ratios (FDRs) and flux recovery ratios (FRRs)-were compared. The solar light-induced photocatalytic decomposition of the foulants was also investigated. WO 3 was used as a composite component to suppress the electron-hole recombination with the goal of achieving higher photocatalytic activity, but the presence of WO 3 was not beneficial concerning the filtration properties. However, the application of TiO 2 , one of the investigated BiVO 4 photocatalysts, and their composites was also beneficial. In the case of the neat membrane, only 87 L m −2 h −1 flux was measured, whereas with the most beneficial BiVO 4 coating, 464 L m −2 h −1 flux was achieved. Pure BiVO 4 coating was more beneficial in terms of filtration properties, whereas pure TiO 2 coating proved to be more beneficial concerning the photocatalytic regeneration of the membrane. The TiO 2 (80%)/BiVO 4 (20%) composite was estimated to be the most beneficial combination taking into account both the aspects of photocatalytic activity and filtration properties.

show abstract

Section: Methodsmentioning

confidence: 99%

Investigation of the applicability of TiO₂, BiVO₄, and WO₃ nanomaterials for advanced photocatalytic membranes used for oil‐in‐water emulsion separation

Santos

Ágoston

Kertész

et al. 2020

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

show abstract

“…The reflection data acquired using this technique do not always provide sufficient information to perform an accurate Monte Carlo simulation-some reflectors are fluorescent or change their angular reflectance distributions with incidence angle. Integrating sphere materials include barium sulfate (BaSO 4 ) [8][9][10][11][12][13][14], magnesium oxide (MgO) [8,[11][12][13][14][15][16][17], and polytetrafluorethylene (PTFE) based reflectors [18][19][20], and these reflector materials have been extensively studied. Other reflectors that are frequently used in optical systems include titanium dioxide (TiO 2 ) paint [11,16,21], Tyvek ® paper [22,23], ESR (Enhanced Specular Reflector) film [24,25], and Spectralon [19,26].…”

Section: Introductionmentioning

confidence: 99%

Reflectivity Spectra for Commonly Used Reflectors

Janecek

2012

IEEE Trans. Nucl. Sci.

131

View full text Add to dashboard Cite

Abstract-Monte Carlo simulations play an important role in developing and evaluating the performance of radiation detection systems. To accurately model a reflector in an optical Monte Carlo simulation, the reflector's spectral response has to be known. We have measured the reflection coefficient for many commonly used reflectors for wavelengths from 250 nm to 800 nm. The reflectors were also screened for fluorescence and angular distribution changes with wavelength. The reflectors examined in this work include several polytetrafluoroethylene (PTFE) reflectors, Spectralon, GORE diffuse reflector, titanium dioxide paint, magnesium oxide, nitrocellulose filter paper, Tyvek paper, Lumirror, Melinex, ESR films, and aluminum foil. All PTFE films exhibited decreasing reflectivity with longer wavelengths due to transmission. To achieve reflectivity in the 380 to 500 nm range, the PTFE films have to be at least 0.5 mm thick-nitrocellulose is a good alternative if a thin diffuse reflector is needed. Several of the reflectors have sharp declines in reflectivity below a cut-off wavelength, including (420 nm), ESR film (395 nm), nitrocellulose (330 nm), Lumirror (325 nm), and Melinex (325 nm). PTFE-like reflectors were the only examined reflectors that had reflectivity above 0.90 for wavelengths below 300 nm. Lumirror, Melinex, and ESR film exhibited fluorescence. Lumirror and Melinex are excited by wavelengths between 320 and 420 nm and have their emission peaks located at 440 nm, while ESR film is excited by wavelengths below 400 nm and the emission peak is located at 430 nm. Lumirror and Melinex also exhibited changing angular distributions with wavelength.

show abstract

“…where R is the reflectance, k absorption coefficient, and s scattering coefficient, respectively, [23]. Figure 6(b) shows a plot of (k/s) spectrum versus photon energy derived from Kubelka-Munk function.…”

Section: Resultsmentioning

confidence: 99%

Tailored 3D CuO Nanogrid Formation

Lee

Gouma

2011

Journal of Nanomaterials

View full text Add to dashboard Cite

This paper reports on the controlled synthesis of 3D CuO nanogrids by the combined use of electrospinning and thermal oxidation of a composite metal mesh/polymer mat architecture. The obtained nanogrids result from three steps encompassing: (i) Cu atom clusters diffusing into the nanofibers producing polymer-metal “core-shell”-type fibers (ii) decomposition of the polymeric shell; (iii) oxidation of the metallic core of the nanofibers to form self-supported, open nanogrids consisting of continuous nanofibers of CuO nanoparticles with an average diameter of 20 nm. The calculated band gap energy of the cupric oxide nanogrids was determined from the UV-Vis spectrum to be 1.32 eV. The unique 3D CuO nanogrids may be used as key components of 3D nanobatteries, photocatalysts, and p-type chemosensors.

show abstract

Kubelka-Munk Optical Coefficients for a Barium Sulfate White Reflectance Standard

Cited by 19 publications

References 3 publications

Investigation of the applicability of TiO₂, BiVO₄, and WO₃ nanomaterials for advanced photocatalytic membranes used for oil‐in‐water emulsion separation

Investigation of the applicability of TiO₂, BiVO₄, and WO₃ nanomaterials for advanced photocatalytic membranes used for oil‐in‐water emulsion separation

Reflectivity Spectra for Commonly Used Reflectors

Tailored 3D CuO Nanogrid Formation

Contact Info

Product

Resources

About

Kubelka-Munk Optical Coefficients for a Barium Sulfate White Reflectance Standard

Cited by 19 publications

References 3 publications

Investigation of the applicability of TiO2, BiVO4, and WO3 nanomaterials for advanced photocatalytic membranes used for oil‐in‐water emulsion separation

Investigation of the applicability of TiO2, BiVO4, and WO3 nanomaterials for advanced photocatalytic membranes used for oil‐in‐water emulsion separation

Reflectivity Spectra for Commonly Used Reflectors

Tailored 3D CuO Nanogrid Formation

Contact Info

Product

Resources

About

Investigation of the applicability of TiO₂, BiVO₄, and WO₃ nanomaterials for advanced photocatalytic membranes used for oil‐in‐water emulsion separation

Investigation of the applicability of TiO₂, BiVO₄, and WO₃ nanomaterials for advanced photocatalytic membranes used for oil‐in‐water emulsion separation