Laser cutting of water using hydrophobic particles. Free Technical Library News

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Laser cutting of water using hydrophobic particles

17.07.2023

Chinese scientists in the field of materials science have discovered an amazing ability to cut ordinary water using a laser. The study showed that a mixture of water with hydrophobic particles of silicon dioxide (silica) allows you to create a variety of patterns on the surface of the water under the influence of laser radiation, which may be important for the development of microfluidic chips.

Laser material processing is widely used in various industries due to its high accuracy and speed. However, the use of a laser to cut water was difficult due to surface tension, which prevents the necessary pressure for cutting. The water is too fluid, making it difficult to cut. However, the possibility of laser water cutting can be of great importance for the development of microfluidic chips used in biomedicine, biology, analytical chemistry and pharmaceuticals.

Scientists from Xian Jiaotong University, along with colleagues, have found a solution to this problem. They found that adding hydrophobic silica nanoparticles to water allows it to be laser cut using laser light at a wavelength of 10,6 micrometers. Hydrophobic particles change the fluidity of water and its light transmission, which ensures effective absorption of laser radiation and deformation. The heat absorbed by the particles is transferred to the water, causing it to evaporate. Water around moves along with hydrophobic particles, closing the cutting area.

It is important that the rate of water evaporation exceed the rate of its replenishment in the area affected by the laser. Therefore, for successful cutting, hydrophobic nanoparticles should be about 5 percent of the total volume. During the experiments, scientists were able to create a variety of shapes with high cutting accuracy within 200 micrometers and create channels from various liquids, which is a prerequisite for microfluidic technologies. The created shapes retain their structure after cutting.

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