Modulus Of Polydimethylsiloxane Research Articles

Study of novel electrical routing and integrated packaging on bio-compatible flexible substrates

Electrical routing and integrated packaging on bio-compatible flexible substrates have been designed and fabricated. The realized packaging method can integrate electrical circuits, stationary components and moving components on flexible substrates. Chips can be embedded on flexible packages and work on a non-planar surface. In this article, the package specimens are tested and simulated in tensile, bending and sealing experiments. In addition, the density and Young’s Modulus of polydimethylsiloxane (PDMS) is discussed with various curing conditions. A prototype made by the packaging process shows its functional system integration. This flexible packaging technology can be applied to communication or sensing products when flexibility is required.

Semitransparent Cu electrode on a flexible substrate and its application in organic light emitting diodes

A semitransparent nanomesh Cu electrode on a polyethylene terephthalate (PET) substrate using metal transfer from a polydimethylsiloxane (PDMS) stamp and nanoimprint lithography is reported. A nanoscale dense mesh pattern is replicated by using a high modulus PDMS stamp. It is found that a uniform pressure of 30 psi and a temperature of 100 °C are needed for the transfer of the Cu mesh structure from the PDMS stamp onto the PET substrate. A fabricated semitransparent Cu electrode exhibits high transmittance in the visible range and good electrical conductivity. The authors show that the transmittance is increased by reducing the linewidth of the mesh pattern and an average transmittance of 75% is achieved. An organic light emitting diode on a flexible substrate is fabricated to demonstrate the potential use of a semitransparent Cu electrode as a transparent conducting electrode.

The barnacle adhesive plaque: morphological and chemical differences as a response to substrate properties

This paper reports the differences in structure and composition of the adhesive plaque biosynthesized by the barnacle, Balanus improvisus, growing on poly(methylmethacrylate) (PMMA) and polydimethylsiloxane (PDMS). Barnacles growing on the low surface energy, low modulus PDMS synthesized a thick rubbery adhesive plaque with granular morphology, as determined with atomic force microscopy, which should be compared with the hard, continuous adhesive plaque produced by barnacles growing on the medium surface energy, glassy PMMA polymer. Calcium was detected in the PMMA adhesive plaque with electron probe microanalysis and infrared spectroscopy showed that calcium was incorporated as calcite, one of the crystal polymorphs of CaCO 3. In comparison, no calcium could be detected in the PDMS adhesive plaque. Three distinct proteins and some minor polypeptides were found with sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis when the adhesive plaque from PDMS was dissolved in a buffer containing 0.5 M dithiothreitol and 7 M guanidine hydrochloride. No proteins could be dissolved when adhesive plaque from PMMA was treated in the same buffer used for PDMS plaque.