What kind of equipment is a UV cleaning surface modification system?
It is also called "UV ozone cleaner," "UV cleaner," "UV ozone cleaner," "UV/O3cleaner," or "UV ozone cleaner. 184.9nm and 253.7nm are the main wavelengths used to decompose and remove organic matter, surface reform, and hydrophilic The main wavelengths are 184.9nm and 253.7nm.
What is the basic structure of a UV ozone cleaner?
- UV lamps
- Light source unit (light leakage cover, reflective mirror, etc.)
- Power supply to control lamp lighting
- Ozone discharge blower + duct hose
The above four items are the basic configuration.
What wavelengths are irradiated in ASM401N, ASM1101N, etc.?
The main short wavelengths are 184.9 nm and 253.7 nm.
Does the energy of the light differ depending on the wavelength?
The shorter the wavelength, the higher the energy, especially at 184.9 nm, which is strong enough to break bonds in organic materials.
What is the specific amount of energy at 184.9nm and 253.7nm?
The wavelength at 184.9 nm is 647 kJ/mol and at 253.7 nm is 472 kJ/mol.
What is the typical molecular binding energy?
- C-C 347.7
- O-O 138.9
- C=C 607
- O=O 490.4
- C-H 413.4
- O-H 462.8
- C-F 441.0
- H-F 563.2
How can I check the effectiveness of UV?
Wettability is generally checked by dropping pure water on the workpiece and measuring its angle using a contact angle meter. Other evaluation methods include a peeling evaluation method called cross-cut and evaluation using inexpensive wetting reagents.
What are the main consumable parts?
The equipment can be used repeatedly by simply replacing the UV lamps periodically. The lamps use low-power, low-pressure mercury lamps, which are economical.
How long is the life of a UV lamp?
Low-pressure mercury lamps have a design life of 6,000 hours of continuous lighting. If the design life is exceeded, the capacity will be reduced and should be replaced with a new one. The device is equipped with a totalization meter, which can be easily checked.
What is the difference from excimer UV irradiation system?
Advantages include: 1) high energy irradiation at 172nm 2) instantaneous lighting. However, the equipment is relatively expensive.
What is ozone?
It is an allotrope of oxygen consisting of three oxygen atoms.The molecular formula is O3 and has a folded structure.It is a highly corrosive, toxic substance with a characteristic fishy, pungent odor. It is also present in the atmosphere in very low concentrations. Ozone has the second strongest oxidizing effect after fluorine and is used for sterilization, virus inactivation, deodorization, decolorization, and removal of organic matter.
How is ozone generated?
Ozone generated by low-pressure mercury lamps is produced when the UV wavelength of 184.9 nm reacts with oxygen in the air.
Ｏ2 ＋ ｈν → Ｏ ＋ Ｏ
Ｏ2 ＋ Ｏ → Ｏ3
How can I measure the ozone concentration generated?
Many ozone concentration measurement devices, including devices that constantly measure ozone, are available from many manufacturers of measurement devices, but a simple method is the Kitagawa-type detector tube-based measurement device. The Kitagawa detector tube is composed of a detector tube and a gas sampler, making it easy to measure ozone.
How is the ozone generated treated?
Ozone generated by low-pressure mercury lamps is produced when a UV wavelength of 184.9 nm reacts with oxygen in the air. Another UV wavelength of 253.7nm, which is output simultaneously, forces the ozone to decompose. The UV reaction with the oxygen concentration in the air (about 30%) and the fact that decomposition occurs at the same time (compared to the high-pressure discharge method) means that highly concentrated ozone is not generated. The amount of ozone produced by 40-110W-class low-pressure mercury vapor lamps is several hundred milligrams/Hr, or several dozen ppm in ozone concentration. The amount of ozone produced by a single lamp does not reach a concentration that would immediately cause serious harm to humans, but even a few dozen seconds of exposure to ozone can cause a suffocating odor that can damage the bronchial tubes and make people feel sick within a few minutes. Regarding the safety of ozone, there is a regulation that workers must work 8 hours a day in an environment with an ozone concentration of 0.1 ppm or less. (The Japan Society for Occupational Health "Recommendations on Permissible Concentrations (2004)") Methods to prevent the outflow of ozone to the outside are often used, such as the activated carbon adsorption method or special adsorption honeycomb filters. In the case of ozone generated from a single lamp, it is possible to reduce the ozone concentration to a harmless level by bringing it into contact with activated carbon for a few seconds.
There is no facility to exhaust ozone. What should I do?
If there is no facility to exhaust ozone at the installation site, an ozone decomposition unit can be installed to ensure safe use. It is called "ozone killer," "ozone decomposer," "ozone decomposition unit," etc.
What range of UV irradiance can be adjusted by adjusting the sample-lamp distance and dimming?
The irradiance of short-wavelength ultraviolet light attenuates inversely proportional to the square of the distance. This is the reason why irradiation at short distances is advantageous when using UV light for various reactions. In most cases, when UV light is used for surface treatment, irradiation is performed at a distance of 10 to 30 mm. Conversely, irradiation at too close a distance will result in uneven illuminance between lamps, so a distance of a few centimeters is appropriate. Standard low-pressure mercury vapor lamps rarely have a dimming function because of the high cost involved in their configuration. A two-stage adjustment function, in which the lamps are energized in standby mode so that the illuminance is restored immediately, is sometimes incorporated in production facilities.
Is it possible to customize the system, such as incorporating a hot plate (max. 300°C), etc.?
It is possible up to around 300℃. We will be happy to accommodate the incorporation of a hot plate function in the stage. Lamp illumination capacity is halved at temperatures above 50°C, so it is necessary to check the effect in advance.
Can each device be compatible with "ozoneless lamps"?
It is possible. By changing the type of quartz, we can provide UV lamps with a wavelength of 253.7 nm as the main wavelength, cutting off wavelengths below 220 nm.
Can UV ozone cleaner be used to clean cantilevers, probes and objects for AFM (Atomic Force Microscope)?
Yes, it can be used. It can remove organic contaminants that cannot be removed by wet cleaning, and can be installed at low cost. The ASM401oz model with integrated ozone decomposition unit requires only a 100 V power supply and can handle workpieces up to 50 mm square. No gas supply is required due to the high illumination specification using a hot cathode lamp.