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2 protocols using bipyridine bpy

1

Synthesis of Cationic Polymer Brushes

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First, 2-(Trimethylsililoxy)ethyl methacrylate and 2-hydroxyethyl methacrylate (HEMATMS and HEMA, Aldrich) were dried under molecular sieves. Second, 2-(N,N,N-Trimethylammonium)ethyl methacrylate chloride (ChMA, Aldrich, St. Louis, MI, USA) as an 80% solution in water was dried under reduced pressure until a constant weight was achieved. Rhodamine B chloride (RhB, POCH S.A.), bipyridine (bpy, Sigma-Aldrich) and α-bromoisobutyryl bromide (Sigma-Aldrich, St. Louis, MI, USA) were used without purification. Copper(I) bromide (Sigma-Aldrich) was purified as described in [38 (link)]. Methanol, tetrahydrofuran (THF), dimethylformamide (DMF) and other solvents were purchased from Chempur and stored under molecular sieves.
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2

Fabrication and Characterization of Fused-Silica Microfluidic Devices

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Fused-silica capillaries (50-μm id, 360-μm od and 20-μm polyimide coating) were purchased from Biotaq Inc. (Silver Springs, MD, U.S.) and Polymicro Technologies (Phoenix, AZ, U.S.). UV-grade fused-silica wafers (25.4 × 9.0 × 1.0 mm) were purchased from Laser Optex Inc. (Beijin, China). Silica micro-particles (Nucleosil, 7-μm diameter and 91.0-m2 g−1 surface area, and YMC Gel, 10-μm diameter and 288-m2 g−1 surface area) were obtained from Macherey-Nagel (Duren, Germany) and YMC Co. (Kioto, Japan) respectively. Piperazine-N, N′-bis(3-propanesulfonic acid) (PIPPS) was purchased from GFS Chemicals (Columbus, OH, U.S.). Nacryloyl-aminoethanol, N-acryloyl-aminopropanol, 2-hydroxyethyl methacrylate, α-bromoisobutyryl bromide, tris[2-(dimethylamino)ethyl]amine (Me6TREN), bipyridine (bpy), allyl alcohol, platinum(0)-1,3-divinyl-1,1,3,3-tetramethyldisiloxane (Karstedt’s catalyst, ~2 % Pt in xylene), hexachloroplatinic acid, cuprous chloride, 2,5-di-tert-butylhydroquinone, potassium cyanide, EDTA, 3-(N-morpholino)propanesulfonic acid (MOPS), methylcellulose, Ampholytes pH 3-10 and pH 6–8 (40% aqueous solutions) and DMSO were purchased from Sigma-Aldrich (St. Louis, MO, U.S.). Analytical grade solvents were obtained from various vendors; they were freshly distilled from sodium shavings before use.
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