Device for measuring the concentration and the size of nanoparticles in liquids in the scattering light mode and in the fluorescent mode

摘要

Device for measuring the concentration, the size and the zeta potential of nanoparticles in liquids in the scattering light mode and in the fluorescent mode, with the following features:a) is a laser beam (1) from above by means of a beam splitter (14) by means of a liquid - lens (9) with an adjustable focus and an optical glass shield (23) into a measuring cell (27) with a particle sample containing (28), wherein the focusing of the laser beam (1) to a point below the phase boundary (21) between the air and liquid samples - is directed,b) from said sample (28) and the protective glass (23) reflected light is in part by the beam splitter (14) and deflected by a further liquid - lens (8) with an adjustable focus on a detector (5), with, in the beam path between the liquid - lens and the detector (5) a fluorescence - filter (10) by means of a sliding - means (24) can be switched,c) a control unit (3) with a particle - tracking - program, or a dls - program (dls = dynamic light valve), an optics - control (15) and a display (2) with a touch screen.