Effect of liquid impregnation on DBD atmospheric pressure plasma treatment of cotton

Abstract

This paper describes the He non-thermal plasma treatment of liquid impregnated cotton fabrics. The cotton fabrics were soaked in either H2O, D2O or ethanol after which they were placed in an atmospheric pressure parallel-plate DBD reactor. The influence of the used liquid in combination with the plasma exposure time was studied using OES, FTIR, XPS and SEM. The addition of (deuterated) water was found to aid more efficiently in the incorporation of polar functional groups onto the cotton surface in comparison to a pure He plasma treatment.The presence of H and OH species in the discharge also caused extensive etching of the surface, which led to the formation of microcraters. The impregnation with ethanol was responsible for the formation of a plasma-based thin film on top of the cotton substrate, which was characterized by a high content of C-C bonds and a smooth surface morphology. These results show that the soaking of cotton fabric prior to plasma exposure can help to more effectively alter its surface properties compared to a dry plasma treatment.

Physicochemical surface analysis and germination at different irrigation conditions of DBD plasma‐treated wheat seeds

“…This change in the He discharge mode was also previously perceived when water-containing samples such as H 2 O-impregnated cotton were put inside the reactor. [29,36] Overall, while comparing the OES spectra recorded with and without seeds in the reactor, one can conclude that the dissociation of water molecules desorbed from the wheat seeds predominated over other reactions involving air impurities, given the higher intensity of OH band, lower intensities of N 2 and N 2 + bands, and the absence of O emission line. OES spectra recorded at different helium flow rates with and without seeds in the reactor can be found in the supporting information ( Figures S1 and S2).…”

“…Similar trends in the OES spectra were previously observed in He discharges in the presence of water or water‐containing samples. [ 29,36 ] Therefore, one can conclude that plasma was desorbing water from the wheat seeds present inside the reactor. In actual fact, the OES spectrum obtained in presence of seeds corroborated this hypothesis, as a significantly more intense OH signal was detected as compared with the OES spectrum recorded in the seedless reactor.…”

“…This change in the He discharge mode was also previously perceived when water‐containing samples such as H 2 O‐impregnated cotton were put inside the reactor. [ 29,36 ]…”

“…All detected species are in perfect conformity with previously recorded OES spectra of He plasmas generated at atmospheric pressure. [33][34][35][36][37] The presence of these non-helium species in a He plasma can be mainly accredited to the dissociation of humid air contaminations lingering in the reactor. [34,36] The characteristic presence of N 2 + (B-X) in helium discharges stemmed from reactions between highly energetic He metastables and ground-state nitrogen in a process known as the penning effect.…”

Surface functionalization of greige cotton knitted fabric through plasma and cationization for dyeing with reactive and acid dyes

“…The broad absorption peak in the region 1400-1300 cm − 1 is related to -CH and -CH 2 bending vibrations. The peaks at around 1157 cm − 1 , 1111 cm − 1 and the broad peak in the region 1030-1000 cm − 1 are assigned to C-O-C stretching vibrations (Chung et al 2004;Ma et al 2016;Molina et al 2020).…”