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Diffusive transport of electroactive species in sub-micron diameter pores of membrane electrodes

“…The surface charge, either intrinsic or induced, seems to be the main reason responsible for the dependencies presented in Fig 3a. The intrinsic charge on the PC surface membrane is proposed to be the negative one [18,19,46,47]. Moreover, the influence of the surface charge of the membrane on the transport of the species of interest will decrease with an increase in the pore diameter because of the increase in the evaporated Pt layer thickness [26] which works as the screening barrier for membrane surface charge.…”

Surface modification of polyfluoroolefin films by glow discharge

“…According to the FTIR data [10,12,[19][20][21][22][23][24], the spectra of the modified polyfluoroolefin films differ from those of the starting films by increased intensity of bands at 1650-1900 cm -1 belonging to oxygencontaining groups and multiple bonds, as well as at 3500-3600 cm -1 assignable to the water adsorbed by the polymer film [16,17]. At 1600-1900 cm -1 , there are three well-defined bands (1880, 1720, and 1650 cm -1 ).…”

“…These results are consistent with the fact that the contact angles increase with time of storage. It is a common opinion that the increase in the θ angle of plasma-modified polymers as they are stored or heated is associated with thermodynamic relaxation processes, specifically, surface-to-bulk transfer of functional groups [10,12,[19][20][21][22][23][24][25][26][27][28].…”

“…The advantage of the dc glow discharge that it allows separate exposure of films to be modified to positively and negatively charged reactive plasma species by treatment on the cathode or anode. The procedure of dc discharge film modification was detailed in [10]. The samples were mounted on the cathode or anode, treatment was performed in the flow mode at the working gas (air) pressure of 10-20 Pa and discharge current of 10-50 mA for 10-90 s.…”

Variation of Lap Shear Tensile Strength of Polycarbonate–Mild Steel Adhesive Joints with DC Glow Discharge Modified Polycarbonate

“…However, its poor surface properties such as wettability/hydrophilicity restrict its uses in certain areas, thus necessitating improvement in the wetting and adhesion properties of PC. The surface modification of polymers has been carried out using a host of techniques, [1][2][3][4][5] ranging from wet chemical treatments to dry treatments such as chemical, UV, ion irradiation, corona, DC, and ac plasmas. The efficacy of DC glow discharge plasma is very high in terms of better uniformity and ease of application.…”