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A hoop-shaped molecular nanorotor

For a long time, humans have been trying to realize the dream of building nanorobots. To achieve this, one such device must be developed, a rotor, a moving component capable of rotating around a fixed axis

Dancing nano robots. Illustration - from the Japanese study
Dancing nano robots. Illustration - from the Japanese study

For a long time, humans have been trying to realize the dream of building nanorobots. The dream, in fact, is getting closer to its fulfillment every day. Nanoscience has succeeded in producing components that will be used in future molecular machines. One such device is a rotor, a moving component capable of rotating around a fixed axis.

Trying to witness such a rotational movement on a molecular scale is a particularly complex task. Japanese researchers from the universities of Osaka (Osaka) and Kyoto (Kyoto) have now succeeded in this challenge. As researcher Akira Harada and his team report in the scientific journal Angewandte Chemie, they were able to obtain images of separate molecular rotors during their motion.

As the subject of their research, the scientists chose a substance called rotaxane. It is a two-component molecular system: a rod-like compound is threaded inside a second ring-like compound similar to a sleeve, while "stops" are mounted on the ends of the rod to prevent the ring from coming out. The researchers attached one end of the rod to a glass surface. In order to observe the rotational movement, the researchers attached a fluorescent side chain that serves as a detector (probe).

In order to observe the rotational movement of the ring relative to the rod, the researchers used a microscopic method known as defocused wide-field total internal reflection fluorescence. With this method, images of the separated rotaxane compounds were obtained in the form of radiation emission patterns. Simply put, if the sleeve is motionless then the fluorescence patterns will allow us to calculate the direction in which the detector emits its fluorescence.

With this method it is possible to calculate the orientation of the sleeve which remains constant in each and every image. However, if the sleeve rotates then the emission pattern will not produce a certain directionality of the detector, because the rotation will allow radiation to be emitted uniformly in all directions together.

The researchers showed that the rotaxane sleeve does not rotate if the sample is dry. However, when they wet it, they could see extremely fast rotational and vibrational motion. The sleeve rotates faster than the time required to take one photo: the rotational speed is over 360 degrees in 300 milliseconds.

to the notice of the researchers

6 תגובות

  1. Hugin:
    When I wrote the first comment about the spaghetti monster I meant exactly the chest.

  2. To Michael and Roy, if anything, indeed, you both touch the edge of the essence..wheel=rotation..axis=axis
    I'll take you back a little, from the Vatican, and let's return to Babylon, which got confused, or assimilated in the meantime,
    And I turn the matter around, Exist==existence, axis=creation,, this means: in Babylonian "reversed" - creation, the axis of the universe..=existence..and of course. the dance of the galaxies, which is similar to a loop, or a Mobius loop,,
    But, on the XNUMXth, right to the point, according to the articles cited here, I will return, with your permission, to the article about arms
    The Milky Way... 2 or 4, if you remember, Hazy insisted then, about a month ago, to present the theory about the cones here.. remember??. So I'll roll the matter a bit into thought.. and help with that, in order to try to understand, you Meaning.."reversal of the direction of the axis of the galactic cone"..like, in an hourglass

    Well, that's it for now.. for a big or small thought...

  3. Rota in Latin = wheel,
    Axis = axis.

    so it works out. By the way, previous papers have already shown that the wheel can rotate, but this is (as far as I know) the first time that rotation has actually been observed under a fluorescent microscope.

  4. Something strange in terms of the order of things:
    The name of the material is derived from two words: Rotation and Axis to imply that there is rotation around an axis.
    This name could only be given to the author after its rotation feature was demonstrated. No Yes?

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