Surface modification of polyethylene powder by nitrogen and ammonia low pressure plasma in a fluidized bed reactor

Mechanochemical preparation of surface-acetylated cellulose powder to enhance mechanical properties of cellulose-filler-reinforced NR vulcanizates

“…The uncompacted powders which are fixed on a glass plate through the use of a double-sided adhesive tape may give more realistic values for the determination of contact angle of powders than the conventional approach that is using compacted plate [11]. A drop shape analysis system (model DSA 100, Kruss co., Germany) which allowed both the determination of contact angle at equilibrium, with a precision of ±1°, and the kinetics of its evolution was used for the measurements, with a software-controlled multi-dosing system DS3228 and drop analysis software DSA3.…”

Repetitively pulsed atmospheric pressure discharge treatment of rough polymer surfaces: II. Treatment of micro-beads in He/NH3/H2O and He/O2/H2O mixtures

“…The relative lack of plasma inside the surface features results in little electron impact dissociation inside features and so a large gradient in radical densities. For example, just after the pulse NH 2 has been generated in the immediate vicinity of the features by electron impact dissociation of NH 3 to a density of 2×10 13 cm −3 , but is almost absent inside the features.…”

Decontamination of Aspergillus flavus and Aspergillus parasiticus spores on hazelnuts via atmospheric pressure fluidized bed plasma reactor

“…In addition, the multiple circulations of the product in the system make it possible to realize an adequate treatment time. Up to now, fluidized bed plasma reactors have mostly been used for the treatment of powders with mean particle size smaller than 300 μm and with the objectives of film deposition (Bretagnol et al, 2004;Chen et al, 2008;Jafari et al, 2011;Karches and von Rohr, 2001). In this study, we expand the range of application of fluidized bed plasma reactors to the treatment of particles in the mm range, which is a challenge due to higher particle gravity and lower particle drag.…”