Nanosecond laser photothermal effect-triggered amplification of photochromic reactions in diarylethene nanoparticles

2020 ◽  
Vol 56 (52) ◽  
pp. 7088-7091
Author(s):  
Yukihide Ishibashi ◽  
Shoki Nakai ◽  
Keisuke Masuda ◽  
Daichi Kitagawa ◽  
Seiya Kobatake ◽  
...  
Keyword(s):  
Laser Heating ◽  
Photochemical Reaction ◽  
Photothermal Effect ◽  
Nanosecond Laser

A photosynergetic response coupled with nanoscale laser heating and the photochemical reaction in nanoparticles resulted in the drastic enhancement of the cycloreversion reaction in aqueous diarylethene nanocolloids.

scholarly journals Explosive vaporization of metallic nanostructures on a surface by nanosecond laser heating under fluids

2021 ◽  
Vol 129 (6) ◽  
pp. 064901
Author(s):  
Venkatanarayana Prasad Sandireddy ◽  
Krishna Prasad Koirala ◽  
Gerd Duscher ◽  
Ramki Kalyanaraman
Keyword(s):  
Laser Heating ◽  
Metallic Nanostructures ◽  
Nanosecond Laser ◽  
Explosive Vaporization

scholarly journals A review on determining the refractive index function, thermal accommodation coefficient and evaporation temperature of light-absorbing nanoparticles suspended in the gas phase using the laser-induced incandescence

2018 ◽  
Vol 7 (6) ◽  
pp. 583-604 ◽  
Author(s):  
Evgeny Valerievich Gurentsov
Keyword(s):  
Refractive Index ◽  
Physical Properties ◽  
Laser Heating ◽  
Volume Fraction ◽  
Accommodation Coefficient ◽  
Nanosecond Laser ◽  
Index Function ◽  
Evaporation Temperature ◽  
Laser Induced Incandescence ◽  
Thermo Physical Properties

AbstractIn this review, the possibility of using pulsed, nanosecond laser heating of nanoparticles (NPs) is demonstrated, in order to investigate their thermo-physical properties. This approach is possible because the laser heating produces high NP temperatures that facilitate the observation of their thermal radiation (incandescence). This incandescence depends on the thermo-physical properties of the NPs, such as heat capacity, density, particle size, volume fraction and the refractive index of the particle material, as well as on the heat-mass transfer between the NPs and the surrounding gas media. Thus, the incandescence signal carries information about these properties, which can be extracted by signal analyses. This pulsed laser heating approach is referred to as laser-induced incandescence. Here, we apply this approach to investigate the properties of carbon, metal and carbon-encapsulated Fe NPs. In this review, the recent results of the measurements of the NP refractive index function, thermal energy accommodation coefficient of the NP surface with bath gas molecules and the NP evaporation temperature obtained using laser-induced incandescence are presented and discussed.

scholarly journals Laser Induced Aggregation of Light Absorbing Particles by Marangoni Convection

2020 ◽  
Vol 10 (21) ◽  
pp. 7795
Author(s):  
Bo-Wei Li ◽  
Min-Cheng Zhong ◽  
Feng Ji
Keyword(s):  
Laser Heating ◽  
Laser Power ◽  
Convective Flow ◽  
Marangoni Convection ◽  
Photothermal Effect ◽  
Vapor Bubbles ◽  
Micro Particles ◽  
Particle Aggregate ◽  
Solution Layer ◽  
Induced Aggregation

Laser induced Marangoni convection can be used to accumulate micro-particles. In this paper, a method is developed to control and accumulate the light absorbing particles dispersed in a thin solution layer. The particles are irradiated by a focused laser beam. Due to the photothermal effect of the particles, the laser heating generates a thermal gradient and induces a convective flow around the laser’s heating center. The convective flow drives the particles to accumulate and form a particle aggregate close to the laser’s heating center. The motion of particles is dominated by the Marangoni convection. When the laser power is high, the vapor bubbles generated by laser heating on particles strengthen the convection, which accelerates the particles’ aggregation.

Sign in / Sign up

Export Citation Format

Share Document