Chemistry Reference
In-Depth Information
TABLE 8.10
Nonthermal Plasma Treatment of Textiles for Details
and References
Quality
Chemistry
Wettability,
Polar groups on surface, as
dying properties,
C-O, C
=
O, O-C, C-O-O,
printability, adhesion enhancing
-COOH, -OH, Si-OH, -NH
2
Water and oil repellency
Plasma polymerization
Fluorine carbon compounds
Silicon compounds
Refractability
Organic phosphonate derivates
Shrink proofing
Surface oxidation
Antibacterial treatment
Metal coating, Ag in plasma polymers
Sterilization
UV, free radicals
Biocompatible textiles
Activation, graft polymerization
8.2.3.3.1 Plasma Treatment
8.2.3.3.1.1 Plasma Treatment of Wool Fibers by Dielectric Barrier Discharges
Which advantageous properties favor the DBD for technological deployment?
•
The DBD can be sustained under normal pressure.
•
The discharge has a positive characteristic, i.e., with rising discharge current
the required voltage also increases.
•
The discharge can operate at different conditions like sine voltage, rectangle
voltage, pulse voltage, and pulse group. With the help of these sustaining
conditions, an extensive control of the averaged discharge power is possible
while also retaining the possibility to influence the single discharge.
•
The DBD can operate with almost arbitrary gases and gas mixtures.
•
Results from experiments performed in small discharge vessels are scalable
when the discharge conditions in large arrangements and at higher powers
are taken into account.
There are a lot of possible ways to manipulate the discharges. One of the possibilities
is to alter the construction of the discharge configuration through the
•
Choice of the dielectric, particularly with regard to the dielectric coefficient
•
Thickness of the dielectric
•
Thickness of the discharge gap
•
Way of sustaining the discharge
In Figure 8.33, an experimental arrangement for treatment of wool fibers is given.
Figure 8.34a illustrates a typical discharge current and sustaining voltage using
a sinusoidal pulse group. The energy fed in by the pulse group can be determined
