Technical Support
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Surface Coating
Sepax Technologies is a leader in surface chemistry technology. Our technologies on surface synthesis can make the thin films from monolayers to polymer layers with the surface structure well defined and the thickness well controlled. The polarities and the functionalities of the coatings could be readily designed to meet various applications. Sepax offers custom-synthesis of surface coatings for capillary tubes, micro-channels and nano-particles.
Hydrophobic
Examples: C30, C18, C8, C4, Phenyl, Fluoro, etc.
Polymer Layer
Uniqueness
Examples: Si wafers, Glass slides, TiO2 plates, Au coated glass plates, Plastics sheets, Contact lens, etc.
Synthesis of well defined surfaces
MonolayerHydrophobic
Examples: C30, C18, C8, C4, Phenyl, Fluoro, etc.
Hydrophilic
Examples: Cyano, pyridine, amino, ethylene glycol, diol, imidazole, etc.
Ionic
Examples: Sulfonate (-SO3H, SCX), Carboxylate (-COOH, WCX), Quaternary ammonium (-NR3+, SAX), Tertiary amine (-NR2, WAX), etc.
Mixed Monolayer
Examples: Hydrophobic and Ionic (-SO3H, or -COOH, or -NR3+, or -NR2), etc.
Uniqueness
- Well controlled thickness: 1-100 nm
- Well controlled polarity from hydrophobic to hydrophilic
Examples: Polystyrene, a highly hydrophobic surface; Polyacrylamide, a highly hydrophilic surface - Well controlled chemical properties from neutral to ionic
Examples: Polyethylene glycol, a neutral surface; Polymer functionalized with DEAE groups, a weak anionic surface - Well controlled polymer chain density
- Mixed polymer layers
Examples: Hydrophobic and Ionic (-SO3H, or -COOH, or -NR3+, or -NR2), etc.
Substracts to Grow Organic Thin Films
Flat SurfaceExamples: Si wafers, Glass slides, TiO2 plates, Au coated glass plates, Plastics sheets, Contact lens, etc.
Particles
Examples: SiO2 micro-particles, PS/DVB particles, Au nanoparticles, Ag nanoparticles, TiO2 nano- and micro-particles, etc.
Porous materials
Examples: Porous SiO2 particles, Porous PS/DVB particles, Porous Polyacrylate particles, Polymer and Glass Membranes, etc.
Applications
- Anti-fouling
- Protein resistance
- Chromatographic separation
- Micro-channel separation
- Protein array
- Membrane separation for biological molecules
- Nanoparticle functionalization
- Contact lens