Photoacoustic monitoring of inhomogeneous curing processes in polystyrene emulsions

Vargas-Luna, M.; Gutiérrez-Juárez, G.; Rodríguez-Vizcaíno, J M; Varela-Nájera, J. B.; Rodríguez-Palencia, J M; Bernal‐Alvarado, J.; Sosa, M.; Alvarado‐Gil, J. J.

doi:10.1088/0022-3727/35/13/313

Cited by 18 publications

(17 citation statements)

References 24 publications

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“…It consists of a conventional PA cell (Figs. 4 and 5), closed on one side by a transparent quartz window and on the opposite side by a transparent polyvinyl acetate foil, used as a backing material, with a thickness of 98 μm (Vargas-Luna et al, 2002). On top of this foil, the agar gel sample was deposited.…”

Section: Photoacoustic Techniquementioning

confidence: 99%

Diffusion of Methylene Blue in Phantoms of Agar Using Optical Absorption Techniques

Vilca-Quispe¹,

Castilla-Loeza²,

Alvarado‐Gil³

et al. 2011

Advanced Biomedical Engineering

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Section: Photoacoustic Techniquementioning

confidence: 99%

Diffusion of Methylene Blue in Phantoms of Agar Using Optical Absorption Techniques

Vilca-Quispe¹,

Castilla-Loeza²,

Alvarado‐Gil³

et al. 2011

Advanced Biomedical Engineering

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“…It consists of a conventional PA cell (see Fig. 1), closed on one side by a transparent window and on the other by a removable 100 μm thick stainless steel AISI-316 foil [20]. On the external surface of the steel foil, a metallic ring container (7 mm in diameter and 5 mm in thickness) is attached.…”

Section: Photoacoustic Techniquementioning

confidence: 99%

“…The substrate (layer 1) is illuminated with a periodic light source, and the sample (layer 2) is atop the substrate. Assuming that during the process of evaporation the sample decreases without losing its flatness, a one-dimensional configuration can be used [20,22]. The onedimensional solution of the Fourier equation for the temperature at the face of the illuminated substrate side is given by [21] …”

Section: Theorymentioning

confidence: 99%

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Photothermal Study of the Formation Dynamics of Fumed Silica Thin Films

et al. 2011

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In this work the formation of thin films by evaporation of liquid mixtures of agglomerated amorphous untreated fumed silicon dioxide nanoparticles is analyzed. Fumed silica is a material that has been used as a thickening agent due to the fact that it has chain-like particle morphology. When mixed with a liquid, the chains bond together and increase the viscosity. The experiments were performed on samples deposited on a metallic substrate. Thermal waves were generated by sending a modulated laser beam at constant frequency onto the substrate. These waves are propagated to the evaporating solution allowing the monitoring of the film formation. It is shown that the last stage of the film formation is strongly affected by the formation of cracks and migration of the material to the lateral surface of the container. The experimental data are compared with predictions of effective thermal property models.

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“…It consisted of a conventional PA cell (see Figs. 1 and 2), closed on one side by a transparent quartz window and on the other by a transparent polyvinyl acetate foil, with a thickness of 98 µm [17]. On top of this foil, the agar gel sample was deposited.…”

Section: Photoacoustic Techniquementioning

confidence: 99%

Diffusion of Methylene Blue in Phantoms of Agar Using a Photoacoustic Technique

et al. 2010

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In this work, the kinetics of diffusion of methylene blue in agar aqueous solution is studied using a photoacoustic technique. Two agar phantoms solutions in water with a relation of mass/volume of 0.01 % and 0.05 % were analyzed. The study was performed using a modified Rosencwaig photoacoustic cell that is enclosed by transparent windows, on both sides. The sample is deposited directly on top of the upper window. A red light beam, at a fixed modulation frequency, is sent through the lower window illuminating the sample and inducing the photoacoustic effect inside the closed chamber of the cell. At the beginning of the experiment, a droplet of 100 µL of agar solution is deposited; afterwards, the signal stabilizes, and 10 µL of methylene blue aqueous solution (0.0125 g · mL −1 ) is added to the surface of the agar. During the first seconds of the experiment, the photoacoustic signal amplitude increases followed by a gradual and long decay. Results for modulation frequencies in the range from 10 Hz to 80 Hz for both agar concentrations are presented. A simple theoretical approach is presented to analyze the experimental data. It is demonstrated that the kinetics of the process can be parameterized as a function of the changes of an effective optical absorption coefficient. From these results, the characteristic time, in which the dye diffusion process stabilizes, is obtained. It is found that this time is larger for samples with a higher agar concentration. These differences provide important results for biomedical sciences in which agar gels are used as phantoms resembling some of the properties of living organs and tissues.

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Photoacoustic monitoring of inhomogeneous curing processes in polystyrene emulsions

Cited by 18 publications

References 24 publications

Diffusion of Methylene Blue in Phantoms of Agar Using Optical Absorption Techniques

Diffusion of Methylene Blue in Phantoms of Agar Using Optical Absorption Techniques

Photothermal Study of the Formation Dynamics of Fumed Silica Thin Films

Diffusion of Methylene Blue in Phantoms of Agar Using a Photoacoustic Technique

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