研究目的
Investigating the influence of laser pulse duration (from pico- to nanosecond) on the ejection dynamics and deposition quality of silver nanoparticle inks in laser-induced forward transfer (LIFT) processes.
研究成果
The study demonstrated that picosecond laser pulses induce higher velocity and larger surface area ejections at lower fluence levels compared to nanosecond pulses, attributed to reduced thermal diffusion and higher initial bubble pressure. However, these differences diminish at higher fluence levels. The findings suggest that both ps and ns lasers can achieve similar deposition qualities under certain conditions, offering flexibility in laser source selection for LIFT applications.
研究不足
The study was limited to a specific silver nanoparticle ink and may not be directly applicable to other materials. The experimental setup's resolution and the assumption of axial symmetry in jet shape analysis could introduce inaccuracies. The influence of laser pulse duration on LIFT dynamics diminishes at higher fluence levels, limiting the scope of findings.
1：Experimental Design and Method Selection
The study employed time-resolved shadowgraphy imaging to compare the dynamics of silver nanoparticle ink ejections induced by picosecond (ps) and nanosecond (ns) laser pulses. The methodology included analyzing jet speed and surface area evolutions to understand the impact of laser pulse duration on LIFT processes.
2：Sample Selection and Data Sources
A highly viscous silver nanoparticle ink (Sicrys? P75DB-1) was used as the donor material. The ink was blade-coated onto a soda-lime glass plate, serving as the carrier substrate. The thickness of the donor layer was varied to study its effect on the LIFT process.
3：List of Experimental Equipment and Materials
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4：Experimental Procedures and Operational Workflow
The LIFT process was initiated by focusing the laser beam through the transparent carrier substrate onto the carrier–donor interface, forming a liquid jet propelled towards a target substrate. Time-resolved shadowgraphy imaging was used to capture the ejection dynamics, with the delay between the LIFT laser pulse and the illumination laser pulse varied to study the temporal evolution of the jet.
5：Data Analysis Methods
The analysis included measuring jet length and surface area from shadowgraphy images, assuming axial symmetry of the jets. Linear and second-order polynomial fittings were applied to analyze jet velocity and surface area evolutions, respectively.
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