Enhanced Second-Order Optical Nonlinearity of Dye Molecules Adsorbed onto Laponite Particles

Boutton, Thomas W.; Kauranen, Martti; Persoons, André; Keung, Michael; Jacobs, Katrien Y.; Schoonheydt, Robert A.

doi:10.1346/ccmn.1997.0450318

Cited by 23 publications

(11 citation statements)

References 21 publications

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“…Molecules confined in the interlamellar space of clay mineral particles exhibit specific photophysical and photochemical properties. Among these are photocatalysis, luminescence, photochemical hole burning, nonlinear optics, and others. − At extremely low loadings of methylene blue (MB) on Laponite in aqueous suspension, the hyperpolarizability of MB is increased by a factor of 11 with respect to its solution value . Engineering of new materials based on these findings remains difficult, because of the lack of knowledge and of control of the organization of molecules and clay mineral particles.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10] At extremely low loadings of methylene blue (MB) on Laponite in aqueous suspension, the hyperpolarizability of MB is increased by a factor of 11 with respect to its solution value. 11 Engineering of new materials based on these findings remains difficult, because of the lack of knowledge and of control of the organization of molecules and clay mineral particles.…”

Section: Introductionmentioning

confidence: 99%

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Multilayered Clay Films: Atomic Force Microscopy Study and Modeling

Duffel¹,

Schoonheydt²,

Grim³

et al. 1999

Langmuir

110

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Self-assembled natural and synthetic clay−polymer films have been prepared by sequential adsorption of poly(diallyldimethylammonium chloride) (PDDA) and clay particles onto mica. The influence of pH, polymer concentration, and clay particle size on the building and roughness of mono- and multicycle depositions was investigated. The monocyclic deposition gives a submonolayer of clay particles. The thickness of the films increases linearly with the number of cycles in the deposition process, thus giving an average increase of thickness per cycles which depends on clay particle size and PDDA concentration. The film roughness is affected by the same parameters and increases with particle size of the clay and PDDA concentration. Optimal conditions for the deposition of smooth multilayer films consist of the combined use of a 0.05−0.5% (w/w) aqueous solution of PDDA and a 0.05% (w/w) clay suspension at pH = 9−10. The film formation was modeled assuming a deposition of homogeneous layers partially covering the surface. The model indicates that Laponite films are characterized by significantly higher surface coverages than natural clay films.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multilayered Clay Films: Atomic Force Microscopy Study and Modeling

Duffel¹,

Schoonheydt²,

Grim³

et al. 1999

Langmuir

110

View full text Add to dashboard Cite

show abstract

“…Note the absorption band at -665 nm and a band or shoulder at -600 rim. The spectrum of MB adsorbed on sample ARG1 is very similar to that of monomeric MB in aqueous solutions (Boutton et al, 1997) and to that of monomeric MB adsorbed on montmorillonite (Bergmann and O'Konski, 1963). The spectra of MB adsorbed on the other samples have a relative increase and broadening of the 600-rim band.…”

Section: Resultsmentioning

confidence: 61%

“…Also, spectral changes after adsorption can be caused by the electrostatic field at the surface of the particle and by shifts relating to changes in polarity of the clay environment as suggested by Boutton et al (1997). The state of MB molecules at the surface is beyond the scope of our study.…”

Section: Resultsmentioning

confidence: 90%

Methylene Blue Dimerization Does Not Interfere in Surface-Area Measurements of Kaolinite and Soils

Avena

Valenti

Pfaffen

et al. 2001

Clays and clay miner.

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Abstract--Methylene blue (MB) was adsorbed from aqueous solutions onto a kaolinite and four soil samples to determine the effects of MB dimerization on the measured surface area. Adsorption isotherms were prepared using four adsorbing solutions containing, respectively, 9, 46, 71, and 83% of MB molecules in the dimeric state. Langmuir-type isotherms were obtained in each case. The results indicate that equilibration occurs quickly. The aggregation state of MB molecules at the surface does not depend on the aggregation state in the initial adsorbing solutions, but on the final equilibrium concentration of MB. A comparison with the specific surface area measured by adsorption of ethylene glycol monoethyl ether indicates that MB adsorbs as a monomer, regardless of the aggregation number in solution. This result occurs owing to the strength of monomer-surface and monomer-monomer interactions. If monomer-surface interactions are favored, the MB dimer adsorbs in the monomeric form. If monomer-monomer interactions are favored, dimer adsorption may occur. The visible spectra of adsorbed molecules indicated that MB was present at the surface as a mixture of monomeric and dimeric species. These results suggest that dimers are formed in the contact region between two aggregating particles.

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“…NLO properties were observed for some organic dyes with specific structure and properties. It is interesting that molecular aggregation induced at the surface of clay minerals can significantly enhance the NLO properties of some dyes (Boutton et al, 1997;Wang et al, 2000). Hybrid materials composed of clay minerals and organic dyes with non-linear optical properties have been studied by several research groups (Jehnichen et al, 2008;Kawamata et al, 2010;Suzuki et al, 2012;Epelde-Elezcano et al, 2014).…”

Section: Non-linear Optical Propertiesmentioning

confidence: 99%

Hybrid systems based on organic dyes and clay minerals: Fundamentals and potential applications

Bujdák

2015

Clay miner.

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This review summarizes several aspects of the interactions between organic dyes and clay minerals, and presents some interesting properties of hybrid materials based on these components. It explains the basic phenomena and photophysical properties of dye/clay mineral hybrid systems (DCHS) while examining the role of clay minerals in them. A brief history of using dyes as tools for clay research and on traditional materials based on DCHS is presented. Metachromasy, the phenomenon of colour change related to the formation of dye molecular aggregates is described in detail and analysed from various perspectives. The properties of DCHS, including photoactivity, luminescence, photocatalytic properties, optical anisotropy and non-linear optical properties are analysed in detail. Clay minerals often play a significant role in the occurrence of specific photophysical phenomena such as resonance energy transfer and luminescence quenching and may influence various reactions, such as conformational changes in dye molecules, photochromism, photoisomerization, photosensitization and other photochemical processes. Routes to synthesize various types of hybrid materials are also described here. The relevance of DCHS for clay research, chemistry and materials science is summarized briefly.

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Enhanced Second-Order Optical Nonlinearity of Dye Molecules Adsorbed onto Laponite Particles

Cited by 23 publications

References 21 publications

Multilayered Clay Films: Atomic Force Microscopy Study and Modeling

Multilayered Clay Films: Atomic Force Microscopy Study and Modeling

Methylene Blue Dimerization Does Not Interfere in Surface-Area Measurements of Kaolinite and Soils

Hybrid systems based on organic dyes and clay minerals: Fundamentals and potential applications

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