echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Chem. SCI.: spin! Magnetic bacteria: Song Weiguo's team from the Institute of chemistry, Chinese Academy of Sciences develops a new type of nano magnetic stirring rod by using magnetotactic bacteria

    Chem. SCI.: spin! Magnetic bacteria: Song Weiguo's team from the Institute of chemistry, Chinese Academy of Sciences develops a new type of nano magnetic stirring rod by using magnetotactic bacteria

    • Last Update: 2018-03-14
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    It has long been known that ultrafine solid particles can be used as oil in water or oil in water emulsifiers These emulsions are sometimes referred to as Pickering emulsions Pickering emulsion has excellent performance, which can reduce the generation of by-products, and has the characteristics of solvent safety, mass transfer and high catalytic efficiency It has great potential in catalysis In Pickering emulsion, each droplet can be considered as a microreactor, which provides a larger contact interface for reaction and hence enhances the mixing efficiency of catalysts and reactants But in the reaction solution, the mass transfer in each droplet is still, that is, the mass transfer in the droplet is only driven by the concentration gradient Therefore, the catalytic reaction rate is still limited by the mass transport in the droplets How to improve the mass transfer efficiency in droplets is the biggest obstacle to further improve the efficiency of Pickering emulsion system (a) Laser scanning confocal microscopy image; (B-C) single chain / whole cell TEM image; (d) HRTEM image of AMB-1 magnetotactic bacteria magnetic particle fixed with glutaric acid phosphate buffer solution; (E) micrograph of nanomagnetic stirring rod rotating under external magnet (source: chem SCI.) In general, researchers use magnetic stirring and mechanical stirring to accelerate the reaction rate in a conventional bottle reaction system However, these traditional agitation methods are impractical for Pickering emulsions To solve this problem, an experimental team led by song Weiguo, a researcher from the Key Laboratory of molecular nanostructure and nanotechnology, Institute of chemistry, Chinese Academy of Sciences, and Cao Changyan, an assistant researcher, developed a simple and effective method to prepare a new type of nano magnetic stirring rod (DOI:10.1039/C7SC05164F) (a) the contact angle of water; (B-D) the laser scanning confocal microscope image (source: Chem Sci.) of Pickering emulsion containing nanomaterials stirred rods (Magnetotactic Sci., MTB) is a group of multicellular microorganisms with various morphological types, which can utilize the magnetic nanoparticles such as Fe 3 in the cell body O 4 and Fe 3S 4 are biomineralized and can arrange magnetic particles in a linear manner These magnetic particles are organized into chains, so MTB can navigate along the geomagnetic lines Because of their uniform gene controlled nano size morphology and biofilm coating, MTB is better than artificial iron oxide nano chain So far, researchers have isolated and cultivated dozens of MTB, including MSR-1, AMB-1, mgt-1, etc AMB-1 is a magnetotactic bacterium containing linear chains of Fe3O4 nanoparticles The characteristics and structure of MTB are very suitable for the preparation of nano magnetic stirring rod (a) the comparison of different substrate conversion rates under the three reaction systems; (b) the conversion rate of cyclic aromatic hydrocarbons under different magnetic rotation speeds in the Pickering emulsion system containing nano magnetic stirring rods (source: Chem Sci.) Song Weiguo team collected AMB-1 bacteria and encapsulated them in the droplets of Pickering emulsion Driven by an external magnetic field, AMB-1 can be rotated in droplets in the emulsion, so that the reaction system in the droplet can be stirred By comparing the epoxidation reaction of cyclooctane with normal stirring, epoxidation of cyclooctane in Pickering emulsion system and epoxidation of cyclooctyl in Pickering emulsion system using AMB-1, the research team first proved that the reaction rate of Pickering emulsion increased to 3 times when using natural MTB as nanomaterials , and compared with the traditional mixing method, it can even be 30 times higher! The schematic diagram of the reaction of nano magnetic stirring rods in Pickering emulsion system (source: Chem Sci.) is trying to expand the application scope of these nanometers bacterial stirrer, and apply this new invention to other synthetic reaction and emulsifying systems They are even going to coat the surface of bacteria with nano particle catalyst to make bacteria become catalyst carrier This is an interesting and potential research As suggested by the researchers, loading nanoparticles based catalysts on MTB may be a very smart way to enhance the synthesis efficiency Corresponding author: Song Weiguo researcher Cao Changyan assistant researcher
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.