Discovery of three-dimensional molecular structure of new nano materials in the United States
discovery of three-dimensional molecular structure of new nano materials in the United States
June 8, 2005
according to phyorg, from Brookhaven National Laboratory of the U.S. Department of energy, University of Central Michigan, And scientists at Michigan State University recently found a three-dimensional molecular GFRP anchor tensile testing machine for nano materials. In addition to being used for the detection of this material, the structure has broad practical application prospects, which are casually done, including more effective solar cells, biosensors and thinner TV/computer display devices. The research results were published in the online edition of the Journal of the American Chemical Society
this material is a "polymer nanocomposite", which is a synthetic "building block" naturally formed by a unique organic polymer and an inorganic part with a size of one nanometer or one billionth of a meter. When these molecules come together, these basic units form this nanocomposite
"polymer nanocomposites have long attracted people's attention because they have great potential to promote progress in many scientific and technological fields," said Tom Vogt, a physicist at Brookhaven National Laboratory, who is one of the research members of this program. "This polymeric material has unique mechanical properties, such as being able to bend and extend, and both components are good conductors of electricity."
the polymer component used in this study is a material called polyaniline, which can be combined with a variety of inorganic compounds such as metal oxide to produce a variety of polymer nanocomposites. In this study, the inorganic compound is composed of vanadium oxide separated by water molecules
in previous studies, scientists have not been familiar with the structure of this nanocomposite, mainly because its "building blocks" are not arranged regularly and neatly. Therefore, the research team cannot rely on traditional structural analysis methods such as X-ray, because these analysis methods require extremely ordered crystalline sample structures
in the traditional X-ray diffraction process, the X-ray will "bounce" or diffract away from the atoms of the sample, and finally form a clear beam. As long as these beams are analyzed, detailed information about the position and type of atoms in the sample can be easily obtained. However, when X-rays are scattered from the nanocomposites, the beam will be "erased", so that scientists cannot get information about the structure
therefore, the research team adopted an unconventional mathematical algorithm to crack these X-ray scattering data. At first, this method was used to analyze the scattering data of polyaniline polymer, then vanadium oxide, and finally the scattering data of this polymer nanocomposite
using the information obtained from these separate analyses, researchers made a three-dimensional model to reflect how polyaniline and vanadium oxide mixed at the atomic level and formed polymer nanocomposites. This model can also describe that a horizontal polyaniline atomic chain is sandwiched between the upper and lower layers of vanadium oxide, forming a "sandwich" structure
"our research results show how to combine the commonly used X-ray analysis technology with unconventional experimental methods to provide detailed information about the structure of nanocomposites. This will help us to improve our understanding of the material properties that Newton's second law of elasticity greater than gravity turns into KX mg=ma," said Valeri Petkov, a major researcher from the University of Central Michigan. "We hope our results can promote people to conduct more research on this nanocomposite."
in addition, this project also includes the research carried out by mercuriou kanatzidis, a scientist at Michigan State University. He and his research team took the lead in developing a method to synthesize these nanocomposites
this study was supported by the National Science Foundation of the United States