Computation of Light Scattering by Anisotropic Spheres of Rutile Titania

Thiele, Erik S.; French, Roger H.

doi:10.1002/(sici)1521-4095(199810)10:15<1271::aid-adma1271>3.0.co;2-c

Cited by 29 publications

(14 citation statements)

References 8 publications

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“…The refractive index of water is from the study by Daimon and Masumura [30]. Since TiO 2 is a birefringence crystal, the average refractive index approximation has been used for the simulation [31,32] by assuming the particles are isotropic. This approximation is used to calculate the far field spectra and near field pattern of TiO 2 nanoparticles [31,32].…”

Section: Simulationmentioning

confidence: 99%

Broadband Tunable and Double Dipole Surface Plasmon Resonance by TiO2 Core/Ag Shell Nanoparticles

2011

Plasmonics

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A design of a TiO 2 core and Ag shell spherical nanoparticle is theoretically presented. The nanoparticles display double dipole plasmonic resonance peaks: one located at the ultraviolet range, the other is widely tunable from the visible to the near infrared region. The tunability can be easily controlled by varying the sizes of the core and the shell. The near field patterns of the double plasmonic resonance peaks are analyzed, and the dipole resonance modes for those two peaks are confirmed for the suitable core-shell sizes.

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Section: Simulationmentioning

confidence: 99%

Broadband Tunable and Double Dipole Surface Plasmon Resonance by TiO2 Core/Ag Shell Nanoparticles

2011

Plasmonics

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“…In this approximation the TiO 2 particle is assumed to be isotropic, with real and imaginary parts of the refractive index equal to n particle ϭ ͑2n o ϩ n e ͒͞3 and k ϭ ͑2k o ϩ k e ͒͞3. Earlier studies 5 have shown that this approximation reproduces the scattering of the optically anisotropic sphere of this diameter quite well. The values for the optical constants were taken from the literature, 8 with linear interpolation applied where the value for the desired wavelength was not available.…”

Section: Calculation Methodsmentioning

confidence: 64%

Orientation dependence in near-field scattering from TiO_2 particles

2001

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This scattering of light by small particles embedded in a continuous transparent medium is influenced not only by the bulk optical properties of the particles and the medium but also by the size, shape, and spatial arrangement of the particles-that is, by the microstructure. If the particles are close together, as in agglomerated coatings or stereolithographic suspensions, interactions between the radiation fields of adjacent particles can lead to variations in the magnitude and spatial arrangement of the scattered light in the near and the far field, which can affect the color and hiding power of a coating, the cure depth and homogeneity in stereolithography, and the threshold intensity for stimulated emission in random lasers. Our calculations of the near- and the far-field scattering distribution for 200-nm TiO(2) spheres in pairs of various orientations and in an ordered array of five particles show that, depending on the orientation of the particles with respect to the incident light, these interactions can either increase or decrease the scattering efficiency, the isotropy of the scattering, and the magnitude of the electric field strength within the matrix and the particles. In the mid-visible range, two particles in line increase the backscattering fraction by 28% and the scattering strength by 38% over that of a single particle, whereas if the particles are in the diagonal configuration the backscattering fraction and scattering strength are actually reduced by addition of the second particle. At shorter or longer wavelengths the backscattering fraction is reduced regardless of the location of the second particle, by as much as 60% when five particles are arranged in the zigzag configuration. These results are surprising in that it is generally assumed that multiple scattering enhances backscattering. Simple models of multiple scattering or scattering of two particles as a single, larger particle are inadequate to explain these results.

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“…In addition to the refractive index and particle size, inter‐particle separation is a third important parameter to influence the pigment scattering efficiency, which is dependent on the spatial dispersion state and the filling fractions of the pigments. When particles get close to a certain degree, the scattering efficiency will decrease as the inter‐particle separation decreased, which is called crowding effect or dependent scattering effect . Theory studies has concluded that, the dependent scattering effect can be neglected when the center‐to‐center separation is greater than two or three diameter, otherwise, it will be significant as the separation decreases .…”

Section: Introductionmentioning

confidence: 99%

Effect of titanium dioxide (TiO₂) distribution and minute amounts of carbon black on the opacity of PVDF based white composite films

Sheng

Xiong

et al. 2015

J of Applied Polymer Sci

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There is a contradiction in making completely opaque and white plastic film with a required high TiO 2 filling fraction, which resulted in inefficient pigment utilization and high cost. Two methods were used here to overcome the contradiction. Firstly, TiO 2 was grafted with poly(methyl methacrylate) (PMMA) by atom transfer radical polymerization to improve the pigment dispersion in poly(vinylidene) fluoride (PVDF). Secondly, minute amounts of carbon black (CB) were added into the PMMA-g-TiO 2 /PVDF system to enhance opacity and decrease TiO 2 fraction. The structure, morphology, and properties of PMMA-g-TiO 2 hybrid particles and composite films were investigated by FTIR, TEM, TGA, SEM, DMA, covering power meter, and UV/VIS spectrophotometer, etc. It was observed that PMMA-g-TiO 2 was dispersed uniformly as individual particles in PVDF due to the good compatibility between PMMA and PVDF. Therefore, the opacity of PMMA-g-TiO 2 /PVDF films was markedly higher than unmodified-TiO 2 /PVDF ones. Adding minute amounts of CB can significantly increase the opacity of the thin film due to its absorption effect on decreasing light transmittance. The contrast ratio (CR) of the PMMA-g-TiO 2 /PVDF film with 20 lm thickness and 25 vol % TiO 2 was 97.67%, lower than the critical CR 98% for a complete opacity, however, the CR of sample with 10 vol % TiO 2 was 98.1% as the CB concentration was 2 3 10 24 g/cm 3 , saved more than 15% TiO 2 . We proposed that a critical thickness d 0 existed for the CB/PMMA-g-TiO 2 /PVDF composite films, under which the light reflectance increased as a function of thickness, otherwise, the reflectance kept constant. Besides, d 0 could be decreased by increasing CB concentration.

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Computation of Light Scattering by Anisotropic Spheres of Rutile Titania

Cited by 29 publications

References 8 publications

Broadband Tunable and Double Dipole Surface Plasmon Resonance by TiO2 Core/Ag Shell Nanoparticles

Broadband Tunable and Double Dipole Surface Plasmon Resonance by TiO2 Core/Ag Shell Nanoparticles

Orientation dependence in near-field scattering from TiO_2 particles

Effect of titanium dioxide (TiO₂) distribution and minute amounts of carbon black on the opacity of PVDF based white composite films

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Computation of Light Scattering by Anisotropic Spheres of Rutile Titania

Cited by 29 publications

References 8 publications

Broadband Tunable and Double Dipole Surface Plasmon Resonance by TiO2 Core/Ag Shell Nanoparticles

Broadband Tunable and Double Dipole Surface Plasmon Resonance by TiO2 Core/Ag Shell Nanoparticles

Orientation dependence in near-field scattering from TiO_2 particles

Effect of titanium dioxide (TiO2) distribution and minute amounts of carbon black on the opacity of PVDF based white composite films

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Product

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Effect of titanium dioxide (TiO₂) distribution and minute amounts of carbon black on the opacity of PVDF based white composite films