GST-Colloids is part of Glucose Sensing Technologies LLC, a Pittsburgh, PA based company that supplies specialty colloids for R&D in photonic crystal materials and applications. Our main products are aqueous suspensions of monodisperse, highly-charged polystyrene particles that self-assemble into high order arrays, known as crystalline colloidal arrays (CCA) which were developed by Prof. Sandy Asher in the University of Pittsburgh. A periodic modulation in the refractive index and the lattice spacing of the CCA are such that visible light is diffracted according to Bragg's Law producing a sparkling color shift effect. Our crystalline colloidal array technology is utilized to create photonic crystal materials for paints, speciality coatings and sensing applications
