A major technical hurdle in microfluidics is the difficulty in achieving high fidelity lithographic patterning on polydimethylsiloxane (PDMS). Here, we report a simple yet highly precise and repeatable PDMS surface micromachining method using direct photolithography followed by reactive ion etching (RIE). Our method to achieve surface patterning of PDMS applied an O(2) plasma treatment to PDMS ...

Poly(dimethyl siloxane) (PDMS) was surface-polymerized with poly(ethylene glycol)methacrylate (PEGMA) by surface-initiated atom transfer radical polymerization (SI-ATRP) in aqueous media at room temperature. Modification of the PDMS surface followed a three-step procedure: (i) PDMS surface hydroxylation by UV/ozone exposure, immediately followed by (ii) covalent attachment of the initiator, 1-t...

To investigate the effect of fluorination on the surface of polydimethylsiloxane (PDMS) film, direct fluorination was performed under a mild condition (approx. 2000 micromol/mol F(2) in nitrogen) for 120 min. No structural damage of PDMS films was observed on the scanning electron microscopic images under the condition. Fourier-transform infrared/attenuated total reflectance (FTIR/ATR) and ener...

With the emergence of microscale biotechnology, such as biomicroelectromechanical systems (“Bio-MEMS”) and microfluidic-based microchips for sensing and diagnostics, polydimethylsiloxane (PDMS)-based elastomers have become very popular materials. PDMS elastomers possess several features that are well suited for these applications: mechanical stability and elasticity, chemical inertness, optical...

Purpose: To examine the responsiveness of the PDMS-2 in children diagnosed with Pompe disease who had different levels of functional mobility. To examine the concurrent validity between the PDMS-2 and the Alberta Infant Motor Scale (AIMS), the Pediatric Evaluation of Disability Inventory (PEDI) and the Pompe PEDI (PPEDI) in children diagnosed with Pompe disease. Methods: A secondary analysis wa...

The electroosmotic flow (EOF) in a poly(dimethylsiloxane) (PDMS) separation channel can be altered and controlled by adding a carboxylic acid to the prepolymer prior to curing. When the prepolymer is doped with 0.5 wt % undecylenic acid (UDA), the electroosmotic mobility in a modified PDMS channel rises to (7.6 +/- 0.2) x 10(-4) cm(2) V(-1) s(-1) (in HEPES buffer at pH 8.5), which is nearly twi...

Poly(dimethylsiloxane) (PDMS)-based microfluidic devices are increasing in popularity due to their ease of fabrication and low costs. Despite this, there is a tremendous need for strategies to rapidly and easily tailor the surface properties of these devices. We demonstrate a one-step procedure to covalently link polymers to the surface of PDMS microchannels by ultraviolet graft polymerization....

Complete spectroscopic, structural, and anion-binding properties are reported for a special class of calixphyrins, namely, 5,10-disubstituted porphodimethenes (PDMs). The crystal structure clearly shows that PDMs exhibit nonplanar (distorted) structures with both sp(2)- and sp(3)-hybridized meso carbon centers. We were able to obtain and characterize the diacid form [H(4)(PDM)][X](2) upon addit...

Organogels with perylene derivatives and phthalocyanines reported in the literature so far involve self-assembly promoted by hydrogen bonds, in addition to aromatic and van der Waals interactions. Although the self assembly of these types of molecules without a hydrogen bonding group in the structure occurs in solution or during crystallization, the gelation studies reported so far incorporated...

Table S1. Host materials and references for Figure 5 in the main text. Reference numbers are those used in the main text. Filler material Host material Reference SWNT PDMS [15] SWNT epoxy [18] SWNT polystyrene [14] SWNT PEDOT-PSS [21] MWNT PDMS [3] MWNT epoxy [17] MWNT polystyrene [11] MWNT polyurethane-urea [10] EG polystyrene [12] EG NBR [5] silver particles PDMS [1] CB polystyrene [16] CB po...