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Showing 1 to 20 of 431 for “"PDMS"”.
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Peeling models for polydimethylsiloxane (PDMS)
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2003.
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Morphologies of PDMS-containing diblock polymers
The morphologies of polydimethylsiloxane (PDMS)-containing diblock polymers are investigated as a function of volume fraction, segregation, processing procedure, and temperature. Strongly segregated polyisoprene-PDMS and polystyrene-PDMS diblocks are prepared according to standard procedures in the …
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Lubrication Forces in Polydimethylsiloxane (PDMS) Melts
The flow properties of polydimethylsiloxane (PDMS) melts at room temperature were studied by measurement of lubrication forces using an Atomic Force Microscopy (AFM) colloidal force probe. A glass probe was driven toward a glass plate at piezo drive rates in the range of 12 – 120 μm/s, which …
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Surface wettability studies of PDMS using flame plasma treatment
… to oxidize the surface of Polydimethylsiloxane (PDMS) in a fraction of a second. It was found to be a much faster way to modify PDMS surface wettability than the current technologies. The surface wettability of Polydimethylsiloxane (PDMS) treated with flame plasma was studied. The surface …
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Physics and Applications of a PDMS Based Centrifugal Microfluidic System
… SU-8 photolithography, polydimethylsiloxane (PDMS) casting. The main contribution of this research is to integrate a flyball governor system into the polymer based centrifugal microfluidic platform. A series of function units are developed based on this unique mechanism. In the first part, …
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Thermal modulation during solvent annealing of PS-PDMS block copolymer
… process on the morphologies of the PS₁₆-b-PDMS₃₇ system. Additional cycles of solvent update and film reswelling were introduced into the annealing procedure to induce greater long-range ordering of film morphologies. Although a range of morphologies were explored, there was special focus …
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Exploration of large scale manufacturing of polydimethylsiloxane (PDMS) microfluidic devices
… manufacturing process of polydimethylsiloxane (PDMS) parts and the emergence of PDMS use in biomedical microfluidic devices addresses the need to develop large scale manufacturing processes for the fabrication of said devices. Casting PDMS parts is found to be the best mass production process …
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Stick-slip behavior of liquid droplets on pillar-arrayed PDMS surfaces
How the roughness of a solid impacts its wettability has been of long time interest. When a droplet moves on a rough surface, it usually undergoes a stick-slip motion. However, this phenomenon lacks a proper explanation with micro-level details and analysis. . In this study, a series of experiments …
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Design and manufacturing of PDMS micro structures with dynamic inclination angle
… 100 micron thickness from polydimethyl siloxane (PDMS); and releasing the film was achieved using a sacrificial mold coating of 300 nm thick PMMA. With PDMS thin films bearing arrays of nanostructures with tunable angles, these surfaces can change surface roughness by external stimuli; for …
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Characterization and optimization of PDMS microfluidic devices for rapid DNA hybridization
Two elastomeric microfluidic devices were designed for the purpose of conducting rapid, flow-based, multiplexed DNA hybridization. Experimental results showed that flowing hybridization assays could detect similar concentrations of labeled probe as standard stationary microarrays, but in 1/100h of …
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Cross-Linked PDMS Expansion Due to Submersion in Liquid and Supercritical CO2
… particles impregnated Polydimethylsiloxane (PDMS) submersed in supercritical carbon dioxide (scCO2) was studied. The purpose of this investigation was to advance micro-corrosion sensor technology utilizing PDMS and micro-metal particle composite as the sensing element currently …
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Investigating escape of low MW siloxanes from PDMS matrix in aqueous solution
… from low molecular weight siloxanes (LMWS) in a PDMS matrix can be implanted during a biopsy and effectively measure oxygen levels in rat tumors with MRI. The Cima group also found that the sensors experienced signal loss over time when stored in air. The purpose of this investigation was to …
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Development of a PDMS Based Micro Total Analysis System for Rapid Biomolecule Detection
… reproducible results. In the present study, a PDMS based micro total analysis system has been developed for rapid, multi-purpose, impedance based detection of biomolecules. The major components of the micro total analysis system include a micropump, micromixer, magnetic separator and …
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Modeling and control of rapid cure in polydimethylsiloxane (PDMS) for microfluidic device applications
Polydimethylsiloxane (PDMS) is an important thermosetting elastomer for microfluidic devices because it can replicate nano-scale features and form flexible membranes useful for microactuation. PDMS is used extensively in research environments because it is readily available and biocompatible. …
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Mechanical and electrical characterization of carbon Black-doped closed-cell Polydimethylsiloxane (PDMS) foam
Carbon Black-doped Polydimethylsiloxane (CB-PDMS) can be used as a pressure sensing material due to its piezoresistive properties. The sensitivity of such a sensor is in part dependent on the stiffness of the material. A closed-cell CB-PDMS foam is being explored as a possible flexible, …
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A PDMS Sample Pretreatment Device for the Optimization of Electrokinetic Manipulations of Blood Serum
… to tune these parameters to an optimal range. A PDMS device was fabricated and used to combine raw sample with specific buffer solutions. Off-chip electrodes were used to induce electrokinetic micro-mixing in the mixing chamber, where homogeneous analyte mixing was achieved in less than one …
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Novel Shear-Thinning of Aged PDMS/Fumed Silica Admixtures and Properties of Related Silicone Elastomers
… [uFSN] with a siloxane polymer, such as PDMS, forms a difficult to process waxy solid admixture that even long periods of high shear mixing will not thin. In the course of the current work it was noted that after a period of storage certain solid admixtures would become viscous liquids …
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