Photochromic dynamics of ophthalmic lenses

Eppig, Timo; Speck, Alexis; Gillner, M; Nagengast, D.; Langenbucher, Achim

doi:10.1364/ao.51.000133

Cited by 13 publications

(9 citation statements)

References 15 publications

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“…The colour change was reversible and sensitive, in accordance with the photochromic properties of microcapsules. The reversible colour changes in photochromic wood material were similar to those in photochromic textiles, glasses, and windows (Qiao et al 2011;Eppig et al 2012;Meng et al 2013). As the addition of microcapsules increased from 2.5% to 10%, the intensity of the blue colour increased.…”

Section: Photochromic Propertiesmentioning

confidence: 54%

Development of Photochromic Wood Material by Microcapsules

Lyu

et al. 2016

BioResources

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To develop a smart, colour-changing wood material, photochromic microcapsules were incorporated into coatings while painting veneered plywood. The properties of microcapsules and coatings were investigated. The colour-changing behaviour of the photochromic wood material in response to sunlight exposure was evaluated. The microcapsules exhibited sensitive colour-changing function and had good thermal stability. The prepared photochromic wood material spontaneously altered its appearance from the veneer colour to a blue colour following intensity changes of the sunlight exposure on the sample. The incorporation of microcapsules had no obvious effect on coating adhesion, but it obviously reduced coating wearability. With the microcapsule content increasing from 2.5% to 10% (of the coating weight), the colour difference (ΔE) of photochromic wood stimulated by sunlight linearly increased from 7.45 to 21.58. The performance of the prepared photochromic wood material can be adjusted by controlling the addition amount of microcapsules.

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Section: Photochromic Propertiesmentioning

confidence: 54%

Development of Photochromic Wood Material by Microcapsules

Lyu

et al. 2016

BioResources

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“…1,2 Algumas destas aplicações que aproveitam diretamente a variação reversível de cor são as lentes oftálmicas fotocromáticas e as tintas, corantes e vernizes fotocrômicos. 3,4 Outra aplicação inclui memórias ópticas, as quais aproveitam a variação reversível de outras propriedades físico-químicas. [5][6][7] Vários compostos fotocromáticos são conhecidos na literatura e variam entre compostos orgânicos, [8][9][10][11] óxidos metálicos como o WO 3 12- 16 e compostos de coordenação.…”

Section: Introductionunclassified

Influência Da Rigidez Do Meio Na Cinética Do Fotocromismo De Ditizonatos Metálicos

Barros¹,

Neto²,

Patrocínio³

2018

Quim. Nova

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INFLUENCE OF THE MEDIUM RIGIDITY ON THE PHOTOCHROMISM KINETICS OF METAL DITHIZONATES. The kinetics of photoisomerization and thermal back reaction of mercury(II) and zinc(II) dithizonates, M(HDz) 2 , were analyzed by photolysis assays in fluid solution and in poly(methyl methacrylate), PMMA, films. In fluid solution, the photo-and thermoisomerization of both complexes can be described by a single exponential function. The Zn(II) dithizonate exhibits rate constants three orders of magnitude greater than that for Hg(II) complex, which is attributed to the higher charge density of the Zn(II) cation. In PMMA films, the thermal back reaction of both complexes can only be described by bi-exponential functions. On this more rigid medium the rate constants are about one order of magnitude slower than the respective ones in fluid solution and the bi-exponential behavior is related to regions in the polymeric matrix with distinct free volumes. The rate constants for both photo-and thermoisomerization of Zn(HDz) 2 in PMMA are reported for the first time and are compared with the well-studied Hg(II) analog. The experimental data provides insights on the role of the metal cation on the photocromic behavior in rigid media, which can lately contribute for technological applications.

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“…Limited research has been done to evaluate systematically the influences of different factors [16]. Limited research has been done to evaluate systematically the influences of different factors [16].…”

Section: Introductionmentioning

confidence: 99%

“…Although the measurement method and device have been more or less standardised, given the unique characteristics of photochromic dyes there are many variables that may influence the measurement results. Limited research has been done to evaluate systematically the influences of different factors . In the present study, lenses made by photocasting and photocoating technologies were tested using a PMR under different conditions, based on but not limited to the requirements of the ISO standard, and the results and findings are discussed and explained.…”

Section: Introductionmentioning

confidence: 99%

Factors affecting the measurement of photochromic lens performance

Ouyang

Huang²,

Tian

et al. 2016

Coloration Technology

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The principles, characteristics, and measurement methodology of photochromism of plastic ophthalmic lenses are briefly introduced and discussed. The factors influencing measurement variation and accuracy, including the preconditioning process, measurement device, and procedure, were investigated on ophthalmic photochromic lenses covering both photocasting and photocoating lens technologies. By design of experiment, factors affecting the measurements were studied using a photochromic measurement rig with reference to ISO 8980-3 requirements. Experimental results prove the necessity for a lens preconditioning process prior to measurement. The excitation light source in the photochromic measurement rig has the greatest impact on measurement variation from the device perspective, while lens temperature is the key environmental factor. On the basis of the investigation, recommendations are made for reducing measurement variations and improving result accuracy. Coloration Technology Society of Dyers and Colourists 238

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Photochromic dynamics of ophthalmic lenses

Cited by 13 publications

References 15 publications

Development of Photochromic Wood Material by Microcapsules

Development of Photochromic Wood Material by Microcapsules

Influência Da Rigidez Do Meio Na Cinética Do Fotocromismo De Ditizonatos Metálicos

Factors affecting the measurement of photochromic lens performance

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