Color effects of uniform colloidal particles of different morphologies packed into films

Niels P. Ryde; Egon Matijević

doi:10.1364/AO.33.007275

Applied Optics
Vol. 33,
Issue 31,
pp. 7275-7281
(1994)
•https://doi.org/10.1364/AO.33.007275

Color effects of uniform colloidal particles of different morphologies packed into films

Niels P. Ryde and Egon Matijević

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Niels P. Ryde and Egon Matijević, "Color effects of uniform colloidal particles of different morphologies packed into films," Appl. Opt. 33, 7275-7281 (1994)

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Abstract

The experimentally determined chromaticities and reflectance spectra of films consisting of uniform ellipsoidal or spherical colloidal hematite particles are compared with calculated values and are found to be in good agreement. The theoretical treatment of the light-scattering problem involves the Mie theory for the spheres and the T-matrix method for the ellipsoids. The reflectance spectra for the pigment films are calculated through the use of the Kubelka–Munk analysis.

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Sample	FeCl₃ (mol dm⁻³)	NaH₂PO₄ (mol dm⁻³)	HCl (mol dm⁻³)	Aging Days	d ± σ (nm)	d _a ± σ (nm)	d _b ± σ (nm)	Aspect Ratio
A	2.0 × 10⁻²	1.0 × 10⁻⁴		3		335 ± 33	220 ± 18	1.5
B	2.0 × 10⁻²	2.0 × 10⁻⁴		3		467 ± 37	216 ± 13	2.2
C	2.0 × 10⁻²	3.0 × 10⁻⁴		3		556 ± 38	180 ± 16	3.2
D	2.0 × 10⁻²	4.2 × 10⁻⁴		3		682 ± 67	166 ± 12	4.1
E	1.8 × 10⁻²		1 × 10⁻³	1	61 ± 9
F	2.4 × 10⁻²		1 × 10⁻³	1	74 ± 13
G	1.2 × 10⁻²		1 × 10⁻³	1	53 ± 8

	Dominant Wavelength (nm)		Purity (%)

Sample	Experimental	Calculated	Experimental	Calculated
A	602	600	30	69
B	600	604	28	52
C	599	—	38	—
D	592	—	42	—
E	590	593	50	78
F	590	593	49	75
G	589	592	50	80

Sample	FeCl₃ (mol dm⁻³)	NaH₂PO₄ (mol dm⁻³)	HCl (mol dm⁻³)	Aging Days	d ± σ (nm)	d _a ± σ (nm)	d _b ± σ (nm)	Aspect Ratio
A	2.0 × 10⁻²	1.0 × 10⁻⁴		3		335 ± 33	220 ± 18	1.5
B	2.0 × 10⁻²	2.0 × 10⁻⁴		3		467 ± 37	216 ± 13	2.2
C	2.0 × 10⁻²	3.0 × 10⁻⁴		3		556 ± 38	180 ± 16	3.2
D	2.0 × 10⁻²	4.2 × 10⁻⁴		3		682 ± 67	166 ± 12	4.1
E	1.8 × 10⁻²		1 × 10⁻³	1	61 ± 9
F	2.4 × 10⁻²		1 × 10⁻³	1	74 ± 13
G	1.2 × 10⁻²		1 × 10⁻³	1	53 ± 8

	Dominant Wavelength (nm)		Purity (%)

Sample	Experimental	Calculated	Experimental	Calculated
A	602	600	30	69
B	600	604	28	52
C	599	—	38	—
D	592	—	42	—
E	590	593	50	78
F	590	593	49	75
G	589	592	50	80

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Applied Optics