Download Plasma Technology for Hyperfunctional Surfaces: Food, by Hubert Rauscher, Massimo Perucca, Guy Buyle PDF

By Hubert Rauscher, Massimo Perucca, Guy Buyle

In line with a undertaking subsidized by way of the eu Union, it is a must-have source for researchers in and academia desirous about application-oriented plasma know-how study. in actual fact divided in 3 sections, the 1st half is devoted to the basics of plasma and provides information regarding clinical and theoretical plasma themes, plasma construction, floor remedy strategy and characterization. the second one part makes a speciality of technological features and plasma strategy purposes in fabric, nutrition packaging and biomedical sectors, whereas the ultimate half is dedicated to issues concerning the environmental sustainability of plasma tactics.

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In order to sustain a plasma and to provide its chemical reactivity, continuous ionization is necessary. Electron collisions with the background neutral species and ions provide the mechanism to determine these conditions when collisions are said to be non-elastic and a certain amount of collisional energy is spent to directly ionize or excite and subsequently ionize the molecules. 33 is valid for ε > ε iz and for ε ≤ εiz the ionization cross-section is identically zero: σiz (ε) ≡ 0. 16 × 10−4 K), typical for electric discharges.

Corona discharges are often called negative, positive, bipolar, AC, DC, or high frequency (HF) coronas, according to the polarity of the stressed electrodes, to whether one or both positive and/or negative ions are involved into the current conduction, and to the nature of the driving field. What makes corona discharges unique in comparison to other plasmas is the presence of a large low field drift region located between the ionization zone and the passive (low field) electrode. Ions and electrons penetrating the drift space will undergo neutralization, excitation, and recombination reactions involving both electrons and neutral and charged molecular and atomic species.

In collisional plasmas at constant power density and electric field, the average (RF) microwave power transferred from the driving field has a maximum value when the collision frequency equals the driving frequency. The absorption of microwave power depends on the collision frequency of the electrons which is controlled by the atomic and molecular species. 56 MHz corresponds roughly to 22 m). Microwave plasmas exhibit a strong peaking in field intensity at the coupling to the microwave cavity that diminishes gradually with increasing distance from the coupling, rather than being deposited throughout the discharge.

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