Abstract
Organic Photo Sensor (OPS) technology allows printing on conformable plastic-like substrates complex-shaped, arbitrarily-sized and pre-aligned photosensitive elements. This article reports, to the best of our knowledge, the first investigation to implement this emerging technology for Multi-Angle Light Scattering (MALS) characterization of nano- and microparticle suspensions. Monte Carlo and Lorenz-Mie theory calculations as well as preliminary experimental results on latex suspensions clearly demonstrate the potential of the proposed approach.
Highlights
There are many different types of Multi-Angle Light Scattering (MALS) systems for the determination of size and concentration of nano to microparticle suspensions and aerosols [1,2,3]
The multi-wire planar cables that are in orange in Fig. 2(b) ensure the electrical connection between the tracks of the Organic Photo Sensor (OPS) film and conventional metallic connectors and DB-25 cables used by the amplification and the data acquisition (DAQ) electronics
Three main objectives were pursued during the optimization procedure: (i) to maximize the number of photosensitive elements on a given OPS film; (ii) to enhance the local angular resolution of the system and to compensate for the excessive dynamic range of the optical signals collected in the forward and backward scattering regions; (iii) to obtain scattering diagrams that are as close as possible to those predicted by the LMT
Summary
There are many different types of MALS systems for the determination of size and concentration of nano to microparticle suspensions and aerosols [1,2,3]. The parallel or perpendicularly polarized laser beam of a 1 W YAG Diodepumped solid-state laser (DPSS), with wavelength 532 nm, is focused at the center of the cuvette down to a waist diameter of =200 μm For extinction measurements, this prototype uses a conventional collection optics and avalanche photodiode (APD). The multi-wire planar cables that are in orange in Fig. 2(b) ensure the electrical connection (not yet optimized) between the tracks of the OPS film and conventional metallic connectors and DB-25 cables used by the amplification and the data acquisition (DAQ) electronics. Its total sampling rate of 250 kS/s, which is much superior to the equivalent response time of the OPS, is used for data averaging and signal-to-noise ratio improvement
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