研究目的
The objective of this work is to modify the surface properties of PTT and the composite PTT/tungsten disulfide inorganic nanotubes (PTT-WS2) by means of LIPSS formation with a femtosecond laser and measure the triggered physicochemical changes.
研究成果
LIPSS were successfully induced on both PTT and PTT-WS2 surfaces with UV femtosecond laser pulses, leading to modifications in surface properties such as increased hydrophilicity, changes in surface energy components, and reduced adhesion force. The presence of WS2 nanotubes in PTT-WS2 required slightly higher fluence for LIPSS formation due to higher crystallinity and thermal dissipation. The study demonstrates the potential of LIPSS nanostructuring to tailor surface properties of polymers and nanocomposites for specific applications.
研究不足
The study is limited by the specific conditions under which LIPSS were induced, including the narrow fluence and number of pulses regime. The effects of LIPSS formation on surface properties were only measured for PTT and PTT-WS2, and the findings may not be generalizable to other materials or nanocomposites.
1：Experimental Design and Method Selection:
The study involved the use of UV femtosecond laser pulses to induce LIPSS on PTT and PTT-WS2 films. The methodology included characterizing the fluences and number of pulses necessary for LIPSS formation, measuring topography via Atomic Force Microscopy, assessing changes in surface energy and contact angle using the sessile drop technique, and evaluating modifications in Young’s modulus and adhesion force with Peak Force-Quantitative Nanomechanical Mapping.
2：Sample Selection and Data Sources:
Free-standing films of PTT and PTT-WS2 nanocomposite, 200 ± 10 μm thick, were prepared by in situ polymerization. The nanocomposite consisted of PTT as the matrix and WS2 nanotubes as the additive (0.5% in weight).
3：5% in weight).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The laser system used was a Ti:Sa oscillator and a regenerative amplifier producing pulses with 260 fs (FWHM), λ = 265nm, a repetition rate of 1 kHz, and an energy up to 1mJ. AFM measurements were performed using an AFM Multimode 8 system with the controller Nanoscope V and the software Nanoscope Analysis 1.50 for image analysis.
4：50 for image analysis.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The fs laser beam was focused perpendicularly on the surface of the sample, placed on a motorized XYZ translation stage. The number of pulses was controlled with an electromechanical shutter, and the fluence was adjusted using neutral filters and a λ/2 plate and a linear polarizer.
5：Data Analysis Methods:
The topography, surface energy, contact angle, Young’s modulus, and adhesion force were analyzed to understand the effects of LIPSS formation on the surface properties of PTT and PTT-WS2.
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