Conference Contribution Details


P Xiao, M Lane, H Abdalghafor, EP Berg and RE Imhof
Poster, 13th International PPP Conference, La Grande Motte, 2012.



Contact imaging using silicon fingerprint sensors, originally designed for biometric applications, has shown potential for skin hydration imaging and surface analysis [1-4]. Previous work shows that such sensors are also sensitive to solvents of high dielectric constant, Ԑ, which may make them useful for solvent penetration measurements [5]. In this poster, we present our latest study on in-vitro solvent penetration through thin film membranes using contact imaging. A small piece of silicone membrane (thickness ~ 100μm) was cut and placed on the sensor surface, then a small solvent droplet was put on the top of the membrane. The sensor then records images continuously over a period of time. The results show that water penetrates through the membrane much faster than EtOH. By calculating grayscale values of the images, we can estimate the quantity of solvent that has penetrated through the membrane and, from the time-dependence, we can calculate diffusion coefficients.


1. SkinChip, a new Tool for Investigating the Skin Surface in vivo.
Lévêque JL and Querleux B. Skin Res Tech 9, 343-347, (2003).
2. Capacitance Imaging of the Skin Surface.
Batisse B, Giron F and Lévêque JL. Skin Res Tech 12, 99-104, (2006).
3. In-vivo Skin Imaging For Hydration and Micro Relief Measurements.
Xiao P, Singh H, Zheng X, Berg EP, Imhof RE. SCV Conference, Cardiff, July 11-13, (2007).
4. Skin Capacitance Imaging for Surface Profiles and Dynamic Water Concentration Measurements.
Singh H, Xiao P, Berg EP and Imhof RE. ISBS Conference, Seoul, May 7-10, (2008).
5. In-vivo Solvent Penetration Measurement using Contact Imaging and Skin Stripping.
Xiao P, Singh H, Ou X, Caparnagiu AR, Kramer G and Imhof RE. SCC Technology Showcase, New York, (2011).


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