Film formation of coatings studied by diffusing-wave spectroscopy

Brun, Alice; Dihang, Hélène; Brunel, Laurent

doi:10.1016/j.porgcoat.2007.09.041

Cited by 49 publications

(46 citation statements)

References 40 publications

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“…The glycerol phantoms studied here have a large range of μ a (0.14-9.95 mm −1 ) and μ s ' (1.2-129.2 mm −1 ) values similar to soft tissues and bio-fluids, as well as coatings, creams, emulsions, and paints in the visible/near-infrared window [1][2][3][4][5]. We have exploited Mie theory to calculate μ a and μ s ' of these phantoms [23].…”

Section: Discussionmentioning

confidence: 99%

“…Laser Speckle Rheology (LSR), an optical approach for the non-contact evaluation of the viscoelastic properties of the materials, has a number of industrial, chemical and biomedical applications related to material sciences, polymer engineering, food sciences, and clinical diagnosis [1][2][3][4][5][6][7][8][9][10][11]. The customary tool for measuring the viscoelastic properties is a mechanical rheometer, which evaluates the ratio of an applied oscillatory stress to the consequential strain in the specimen, over a limited oscillation frequency range to calculate the frequency-dependent viscoelastic modulus, G*(ω).…”

Section: Introductionmentioning

confidence: 99%

“…The customary tool for measuring the viscoelastic properties is a mechanical rheometer, which evaluates the ratio of an applied oscillatory stress to the consequential strain in the specimen, over a limited oscillation frequency range to calculate the frequency-dependent viscoelastic modulus, G*(ω). The capability of LSR for measuring this quantity in a non-destructive/non-contact manner from the speckle fluctuations is appealing, particularly in applications where mechanical manipulation may alter the sample properties and in cases where only small sample volumes are available for measurement [1][2][3][4][5][6][7][8][9][10][11]. In LSR, a small volume of the sample is illuminated by a mono-chromatic laser source and a high-speed CMOS camera is used to capture the temporal fluctuations of back-scattered speckle patterns, induced by Brownian displacements of scattering particles [1,[6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Correction of optical absorption and scattering variations in laser speckle rheology measurements

Hajjarian

Nadkarni

2014

Opt. Express

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Laser Speckle Rheology (LSR) is an optical technique to evaluate the viscoelastic properties by analyzing the temporal fluctuations of backscattered speckle patterns. Variations of optical absorption and reduced scattering coefficients further modulate speckle fluctuations, posing a critical challenge for quantitative evaluation of viscoelasticity. We compare and contrast two different approaches applicable for correcting and isolating the collective influence of absorption and scattering, to accurately measure mechanical properties. Our results indicate that the numerical approach of Monte-Carlo ray tracing (MCRT) reliably compensates for any arbitrary optical variations. When scattering dominates absorption, yet absorption is non-negligible, diffusing wave spectroscopy (DWS) formalisms perform similar to MCRT, superseding other analytical compensation approaches such as Telegrapher equation. The computational convenience of DWS greatly simplifies the extraction of viscoelastic properties from LSR measurements in a number of chemical, industrial, and biomedical applications.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Correction of optical absorption and scattering variations in laser speckle rheology measurements

Hajjarian

Nadkarni

2014

Opt. Express

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“…The results can then be explained by considering the effect on film formation of the hard phase (compare also with Figs. 4,5,6). Lower amounts of both hydrophilic coalescents (1 wt%) apparently do not plasticize the hard phase sufficiently to get the desired film formation and interpenetration of the polymer chains.…”

Section: Resultsmentioning

confidence: 99%

“…[2][3][4] A number of methods are available to probe the degree of film formation, for example by diffusion wave spectroscopy, 5 magnetic resonance imaging (MRI)-profiling, 6 fluorescence resonance energy transfer (FRET)-techniques, 7,8 microscopic techniques, 9 and neutron scattering. 10 The drawback of all these techniques is that they do not provide information on the development of the mechanical properties of the coating film, which are crucial for the performance.…”

Section: Introductionmentioning

confidence: 99%

Preferred partitioning: the influence of coalescents on the build-up of mechanical properties in acrylic core–shell particles (I)

2012

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The partitioning of three coalescents of different polarity in different phases of multiphase acrylic particles was studied to provide a rationale for obtaining the desired performance of binders for wood coatings in terms of the ideal balance between hardness development, blocking resistance, and blushing resistance. Minimum film formation temperature-and aqueous differential scanning calorimetry-measurements on the hard phase polymer by itself showed the different extents to which both hydroplasticization and plasticization by the coalescent occur. Dynamic mechanical thermal analysis was subsequently used to visualize wet-T g effects of three different coalescents in the hard and soft polymer phase of these multiphase acrylic particles. The results have important consequences for the formulation of such binders in applications for exterior wood coatings and coatings in general.

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Water Whitening Reduction in Waterborne Pressure‐Sensitive Adhesives Produced with Polymerizable Surfactants

Aguirreurreta

Dimmer

Willerich

et al. 2015

Macro Materials & Eng

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Water whitening resistance of pressure-sensitive adhesives obtained from high solids content acrylic dispersions is studied. The effect of the pH and surfactant system on the water whitening of the final films is investigated. The pH used throughout the polymerization process and the pH at which the final latex is adjusted just before the application have a substantial influence on the water whitening resistance. The performance of films obtained from latexes stabilized using conventional surfactant is compared to that of latexes stabilized using polymerizable surfactant or polymerizable stabilizer. In the films containing the conventional anionic surfactant, the water whitening phenomenon is affected by two counteracting mechanisms: latex stability and excess of surfactant in the aqueous phase. However, when polymerizable surfactants or stabilizer are used, due to their incorporation into the polymer backbone, no effect of the surfactant excess is observed leading to films with superior performance increasing their concentration. Macromol. Mater. Eng. 2015, 9, 925-936 ß 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 926 www.MaterialsViews.comN/D not determined. a) Per liter of water (mmol Á L -1 ); b) measured by DLS; c) measured by HPLC-ELSD.

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Film formation of coatings studied by diffusing-wave spectroscopy

Cited by 49 publications

References 40 publications

Correction of optical absorption and scattering variations in laser speckle rheology measurements

Correction of optical absorption and scattering variations in laser speckle rheology measurements

Preferred partitioning: the influence of coalescents on the build-up of mechanical properties in acrylic core–shell particles (I)

Water Whitening Reduction in Waterborne Pressure‐Sensitive Adhesives Produced with Polymerizable Surfactants

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