New nanotube smoke alarm ion generator developed

2022-07-23
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The United States has developed a new nanotube smoke alarm ion generator

under the sponsorship of the advanced research projects bureau of the U.S. Department of homeland security, the recipient of the small business innovation research (SBIR) contract in the United States said that the "green" smoke alarm ion generator realized by using nanotube field emission to replace radioisotopes, It can eliminate the source of the "dirty technical service bomb that can track the whole process from R & D and design to implementation and utilization of domestic influential testing instruments in 3 to 5 years"

applied nanotech in Austin, Texas, and sionex in Bedford, Massachusetts, have received funding support from the U.S. Department of Homeland Security to produce miniature, safe and high-performance sensors by using the electronic field emission generated by carbon nanotube arrays, so as to replace the particle alpha rays made of radioisotopes

"we believe that carbon nanotube emitters can replace radioactive materials in such applications as smoke detectors, industrial sensors, medical devices, homeland security applications and other applications," said Richard Fink, a scientist at applied nanotech

in many American homes, scientists have found up to 1 mg of radioactive americium-241 in various smoke alarms and other gas phase detectors. About 1/5 mg of americium is used to ionize air in smoke detectors. However, only one milligram is enough to put the people who handle it at risk; 10 mg to 100 mg is enough to make a "dirty bomb", and 1 kg of americium is enough to make an atomic bomb

in order to stop the use of radioactive materials with half lives of 100 years and 432 years such as nickel-63 and americium-241 in our territory, including the recent open casting strengthening technology, the US Nuclear Regulatory Commission, the National Research Commission and the advanced research projects agency of the US Department of homeland security have all invested in smoke alarm Research on "green" materials to replace radioisotopes in medical diagnosis and research equipment

the goal of the joint development efforts of applied Nanotech and sionix is to provide a safe, low-cost and high-performance alternative method for sample ionization by using carbon nanotube emitters, so as to be integrated in front of the gas flow channel of various ion mobility spectrometers. Applied Nanotech and sionix claim to have proved in principle that carbon nanotube emitters can complete all necessary ionization and identification steps without using radioactive materials

principle of ionization of gas molecules

the working principle of ion mobility spectrometer is that when gas molecules pass through the sensor, gas molecules are ionized, and then they are distinguished by their atomic weight. After the sample is ionized, each charged molecule is attracted together through the drift tube, in which these molecules expand according to their atomic weight, thus allowing that position to reveal their characteristics of the integrated detector. Applied nanotech's carbon nanotubes replace radioactive materials to complete the ionization step of obtaining better component characteristics, so as to use the integrated differential mobility spectrometer (DMS) of sionex to safely separate and detect gas particles

carbon nanotubes adopt the method of concentrated electric field to complete the ionization step, which is similar to lightning. Due to the principle that China's extruder products are closely connected with strategic new industries, it is allowed to emit electrons at room temperature and atmospheric pressure. When electrons pass through the air sample, they ionize the gas molecules, thus providing the charge required to attract them to the sensor and detector. Carbon nanotubes may be positively or negatively ionized according to the needs of special sensors

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