Ricerc@Sapienza

Laser Transmission Spectroscopy (LTS) is a relatively new technique capable of rapidly determining the size, shape, refractive index and number of meso- and nano-particles in colloidal suspensions. This technique relies on the measurement of the transmission of laser light through the sample as a function of wavelength (using a tunable laser). The measured extinction is then  inverted  to obtain the particle size distribution as well as information about particles shape,  structure (for example,  the presence of shells) and refractive index. This methodology is applicable in the low-volume-fraction regime (≤0:5%) and in a broad range of particle sizes, from about 5 to  3000 nm.