Femtosecond pulsed laser ablation and deposition of thin films of polytetrafluoroethylene

Superhydrophobicity of polytetrafluoroethylene thin film fabricated by pulsed laser deposition

“…The typical absorption peaks of PTFE, at around 1224 and 1155 cm À1 , are assigned to the asymmetrical and symmetrical stretching modes of CF 2 bond, respectively. The peaks with smaller intensity at around 640-620 cm À1 are attributed to the chain stretching and wagging modes of CF 2 bond, while the bending and rocking modes are at 553 and 507 cm À1 respectively [13,14]. This spectrum shows that PTFE film was successfully deposited.…”

“…A wellknow polymer, polytetrafluoroethylene (PTFE), of excellent chemical stability, was chosen as the target material, since it can be easily deposited on substrates by the PLD method [10][11][12][13][14]. PTFE is also known as a polymer of low surface adhesion and low surface energy, The contact angle of a smooth PTFE surface is about 1088 [15], while the samples prepared by this simple method can reach 1708 or even higher.…”

Energy-saving synthesis of electrolytic manganese dioxide using oxygen cathode with Pt/TiO2-CNx nanocatalysts

“…Figure 1 presents the XRD pattern of the Pt/TiO 2 -CNx GDE. The peaks at 2θ = 18.9° and 2θ = 25° represent the characteristic peak of PTFE [26] and graphite-like carbon [27], respectively. PTFE is the primary binder and hydrophobic material adopted to avoid cathode flooding, which can increase oxygen permeability within the electrode [28].…”

The influence of organobentonite clay on CO2 laser grooving of nylon 6 composites

“…In terms of the laser pulse duration, both ultra-short (femtosecond [13], and picosecond [14]), as well as long (microsecond) or continuous operation lasers [8][9][10][11][12] can be utilized. The main motivation for the use of ultra-short pulses is the reduction of the heat-affected zone HAZ due to the shorter duration of the heat source, or the improvement of light absorption resulting from nonlinear effects such as multiphoton absorption [15].…”