Evaporation and contraction of a droplet that wets a surface monitored by photoacoustic detection

Miranda, L. C. M.; Cella, N.

doi:10.1103/physrevb.47.3896

Cited by 18 publications

(15 citation statements)

References 9 publications

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“…The evaporation of isopropanol droplets on an Al substrate using photoacoustics (PA) recorded at a 160 Hz modulation frequency has been studied by Miranda and Cella [1]. These authors analyzed the evolution of the PA signal as a function of time for monitoring the evaporation and contraction of a droplet wetting the flat Al surface.…”

Section: Resultsmentioning

confidence: 99%

“…Experimental results for the study of evaporation of liquids [1,9] and formation of polymers [5] using photothermal techniques have been previously reported. The evaporation of isopropanol droplets on an Al substrate using photoacoustics (PA) recorded at a 160 Hz modulation frequency has been studied by Miranda and Cella [1].…”

Section: Resultsmentioning

confidence: 99%

“…The subscripts 1, 2, and g refer to layers 1 and 2, and the surrounding gas, respectively. Considering that the transversal cross section of the system does not change in time, we assume that the evaporation rate follows the equation [1,7],…”

Section: Theorymentioning

confidence: 99%

“…The dynamics of evaporation from a solution and the subsequent formation of a thin film on a substrate is a complex process, during which the system passes through a series of stages where it is originally thermally thick and eventually becomes ther-P. Martinez-Torres · J. J. Alvarado-Gil (B) Applied Physics Department, CINVESTAV-Unidad Mérida, Carretera Antigua a Progreso Km 6, A. P. 73 Cordemex, Mérida Yucatán 97310, México e-mail: jjag09@yahoo.com mally thin [1,2]. The photothermal (PT) study of this process has been mainly devoted to the study of films that remain thermally thick during the formation.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring the Formation of Thin Films by Photothermal Technique

Martínez-Torres

Alvarado‐Gil

2007

Int J Thermophys

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Evaporation is a widely used technique for developing thin films. In this study the formation of a film on top of a substrate is investigated using a photothermal technique. The configuration implies the illumination of an opaque substrate by modulated laser radiation and the detection of the heat at the illuminated zone. The system is considered as a two-layer system in which the non-illuminated layer presents a dynamic response, the thickness and thermophysical properties, which change as a function of time. Results of modeling such a system, which depend on the evaporation rate and concentration changes are presented. It was found that for the process in which evaporation constitutes a dominant contribution, one observes a stable long time process, and at a certain instant, the amplitude of the photothermal signal suddenly grows. On the other hand, additional contributions (such as the increase of concentration) involve processes that cause the amplitude of the photothermal signal to grow smoothly with time. The contributions of different mechanisms involved during the film formation are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Monitoring the Formation of Thin Films by Photothermal Technique

Martínez-Torres

Alvarado‐Gil

2007

Int J Thermophys

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“…PT techniques have been used to monitor in real time, the evolution of different processes, such as oxygen release during the photosynthesis process [5,9], gas adsorption and desorption in porous substances [10,11], real-time monitoring of the gas concentration in a binary gas mixture [12], detection of adulterants in automotive fuels [13], evaporation and contraction dynamics of droplets on metallic surfaces [14], effects of changes in geometry on the photoacoustic (PA) signal when a solvent is evaporated inside of a ring [15,16], among others.…”

mentioning

confidence: 99%

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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