Wrinkle-Based Measurement of Elastic Modulus of Nano-Scale Thin Pt Film Deposited on Polymeric Substrate: Verification and Uncertainty Analysis
ABSTRACT Wrinkle-based measurement of elastic modulus for a nano-scale thin film was analyzed. As a demonstrative example, the wrinkles
of Pt films on a Polydimethylsiloxane (PDMS) substrate under compressive loading were formed with a well-defined wavelength,
corresponding to the difference of elastic moduli between the films and substrates. The elastic modulus of the Pt nano-scale
thin film measured with the wrinkle-based measurement was found to be consistent with that independently measured with micro-tensile
test. Uncertainty of the wrinkle-based measurement was analyzed to figure out the main uncertainty components for the evaluation
of elastic modulus measurement, and guidelines for the reliable wrinkle-based measurement were suggested.
KeywordsNano-scale thin film-Pt-Wrinkle-Elastic modulus-Tensile test
- SourceAvailable from: Hongkai Wu[Show abstract] [Hide abstract]
ABSTRACT: This paper describes a method for fabricating three-dimensional (3D) microfluidic channel systems in poly(dimethylsiloxane) (PDMS) with complex topologies and geometries that include a knot, a spiral channel, a "basketweave" of channels, a chaotic advective mixer, a system with "braided" channels, and a 3D grid of channels. Pseudo-3D channels, which are topologically equivalent to planar channels, are generated by bending corresponding planar channels in PDMS out of the plane into 3D shapes. True 3D channel systems are formed on the basis of the strategy of decomposing these complex networks into substructures that are planar or pseudo-3D. A methodology is developed that connects these planar and/or pseudo-3D structures to generate PDMS channel systems with the original 3D geometry. This technique of joining separate channel structures can also be used to create channel systems in PDMS over large areas by connecting features on different substrates. The channels can be used as templates to form 3D structures in other materials.Journal of the American Chemical Society 02/2003; 125(2):554-9. · 10.68 Impact Factor
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ABSTRACT: A freely floating polymer film, tens of nanometers in thickness, wrinkles under the capillary force exerted by a drop of water placed on its surface. The wrinkling pattern is characterized by the number and length of the wrinkles. The dependence of the number of wrinkles on the elastic properties of the film and on the capillary force exerted by the drop confirms recent theoretical predictions on the selection of a pattern with a well-defined length scale in the wrinkling instability. We combined scaling relations that were developed for the length of the wrinkles with those for the number of wrinkles to construct a metrology for measuring the elasticity and thickness of ultrathin films that relies on no more than a dish of fluid and a low-magnification microscope. We validated this method on polymer films modified by plasticizer. The relaxation of the wrinkles affords a simple method to study the viscoelastic response of ultrathin films.Science 09/2007; 317(5838):650-3. · 31.20 Impact Factor
- JOURNAL OF MATERIALS RESEARCH. 01/1998; 13(10):2852-2858.