The movement of the anion over the cation has allowed chemists to write information to a monomolecular layer

Scientists have created the storage information of the monolayer of molecules of the salt, which consisted of a flat of organic cation and inorganic anion. Under the tension imposed by the probe of the electron microscope, the anion was above the alkyl part of the cation, dimming it on the microscope image, and could remain in that position even when the information is read as long as it is not specifically erased. In the authors ‘ estimation, binary media in practice can store from 20 to 30 terabits of information per square centimeter, and theoretically — to 41 terabytes. The results of a study published in the journal Angewandte Chemie International Edition.

To increase the amount of information that can be stored per unit area of materials scientists create different molecular structures. Most of these systems get in the high vacuum and low temperatures (usually less than 77 Kelvin). Most often, work only describe the principle of switching between binary States of the molecules, but not demonstrated on a single molecule or may form a monomolecular layer.

One of the most important properties, which should have a molecular storage device is to operate at room temperature and pressure. Kang Tsui (Cui Kang) and his colleagues from the Catholic University of Louvain proposed a system for storing information under normal conditions, which is based on the supramolecular changes of salt from the large flat polyaromatic organic cation and a small anion perchlorate. They put a solution of this salt in octanoic acid on a gold surface Au (111), the molecules are lined up in neat rows in a supramolecular structure. Influencing the electric field of the probe needle of the scanning tunneling microscope, the authors have changed the dipole of the molecule so that the microscope image they seemed dark compared to the intact molecules. Thus, the authors recorded four bits of information that you could find by scanning the entire surface for 30 minutes.

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