microParticles GmbH offers electrolyte-stable research particles
In medical research, microfluidics, and other applications, agglomeration of tracer particles or their sticking to the walls of channels, vessels, or tubes often becomes a problem. Namely in electrolyte solutions, aggregation of conventional polymer particles may hinder experiments severely. microParticles GmbH now succeeded in overcoming such difficulties with PS (polystyrene) and PMMA (poly(methyl methacrylate)) particles by PEG (poly(ethylene glycol)) modification. The particles bear a special permanent PEG coating, anchored in the particle surface. They are colloidally stable even in 2 n NaCl solution. The custom-made particles come either untagged as 5 wt.-% or fluorescently labelled as 2,5 wt.-% aqueous dispersions. They possess the following features:
- Available diameter range nominal 300 nm up to 10 microns.
- Narrow particle size distributions (C.V. values < 3 %).
- Spherical shape.
- Untagged or fluorescently labelled, according to customer requirements.
- Material density 1.05 g/cm³ (PS), 1,19 g/cm³ (PMMA).