3 documents found, page 1 of 1
Spray drying as a viable process to produce nano-hydroxyapatite/chitosan (n-HAp...
G. Ruphuy; A. Saralegi; J. C. Lopes; M. M. Dias; M. F. BarreiroIn this work nano-hydroxyapatite/chitosan (n-HAp/CS) hybrid microparticles were prepared by spray drying following a methodology where, in a first step, aqueous nanodispersions of n-HAp in the presence of chitosan were produced by fast stirring at pH values below and above chitosan pKa (5.5 and 7.0, respectively). The mixing system used allowed the production of homogeneous and stable nanodispersions, and the s...
An innovative static mixer photoreactor: Proof of concept
M. J. Lima; A. M. T. Silva; C. G. Silva; J. L. Faria; J. C. B. Lopes; M. M. DiasAn innovative application for the NETmix (R) reactor is validated in the present work, namely the homogeneous photo-Fenton treatment of natural waters contaminated with organic pollutants using solar light. Three antibiotics presenting high bacterial resistance (ciprofloxacin, sulfamethoxazole and trimethoprim) were selected as model pollutants. The influence of Reynolds number (Re = 38-400) on the pollutants d...
Mixing dynamics control in RIM machines
Ertugrul Erkoç; Ricardo J. Santos; Maria I. Nunes; M. M. Dias; José Carlos B. LopesA novel control scheme for assessing mixing on reaction injection moulding is introduced and the results of its implementation are presented. The control scheme is based on the dynamic measurement of static pressure in the feeding lines to the mixing chamber injectors. The pressure signal oscillates with a frequency which allows assessing the flow regime inside the mixing chamber. Here, the pressure signal freq...