Periodicity and Atomic Ordering in Nanosized Particles of Crystals

نویسندگان

  • Valeri Petkov
  • Nick Bedford
  • Marc R. Knecht
  • Michael G. Weir
  • Richard M. Crooks
  • Wenjie Tang
  • Graeme Henkelman
  • Anatoly Frenkel
چکیده

Valeri Petkov,*,† Nick Bedford,† Marc R. Knecht,‡,§ Michael G. Weir,‡ Richard M. Crooks,‡ Wenjie Tang,‡ Graeme Henkelman,‡ and Anatoly Frenkel| Department of Physics, 203 Dow Science, Central Michigan UniVersity, Mt. Pleasant, Michigan 48859, Department of Chemistry and Biochemistry, The UniVersity of Texas at Austin, 5300 Austin, Texas 78712, and Department of Physics, YeshiVa UniVersity, 245 Lexington AVenue, New York, New York 10016

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Size, shape, and internal atomic ordering of nanocrystals by atomic pair distribution functions: a comparative study of gamma-Fe2O3 nanosized spheres and tetrapods.

Due to their limited length of structural coherence nanocrystalline materials show very diffuse powder X-ray diffraction patterns that are difficult to interpret unambiguously. We demonstrate that a combination of high-energy X-ray powder diffraction and atomic pair distribution function analysis can be used to both assess the geometry (i.e., size and shape) and determine the internal atomic or...

متن کامل

Element-specific structure of materials with intrinsic disorder by high-energy resonant x-ray diffraction and differential atomic pair-distribution functions: A study of PtPd nanosized catalysts

We demonstrate how high-energy resonant x-ray diffraction XRD and differential atomic-pair-distribution function PDF analysis can be used to characterize the atomic ordering in materials of limited structural coherence with both excellent spatial resolution and element specificity. First we prove that this experimental approach is feasible by probing the K-absorption edge of Au 81 keV atoms in ...

متن کامل

A novel preparation method for drug nanocrystals and characterization by ultrasonic spray-assisted electrostatic adsorption

PURPOSE The purpose of this study was to develop a novel and continuous method for preparing a nanosized particle of drug crystals and to characterize its properties. MATERIALS AND METHODS A new apparatus was introduced to crystallize nanosized drug crystals of amitriptyline hydrochloride as a model drug. The samples were prepared in the pure state by ultrasonic spray, and elaborated depositi...

متن کامل

Structural Characterization and Ordering Transformation of Mechanically Alloyed Nanocrystalline Fe-28Al Powder

The synthesis of nanocrystalline Fe3Al powder by mechanical alloying as well as the structural ordering of the synthesized Fe3Al particles during the subsequent thermal analysis were investigated. Mechanical alloying was performed up to 100 hours using a planetary ball mill apparatus with rotational speed of 300 rpm under argon atmosphere at ambient temperature. The synthesized powders were cha...

متن کامل

Noncrystallographic Atomic Arrangement Driven Enhancement of the Catalytic Activity of Au Nanoparticles

Determining the atomic-scale structure of nanosized particles remains a challenge and crucial goal for today’s science and technology. We investigate the atomic-scale structure of 3−8 nm Au particles obtained by a fast solution reaction and find it to be of a noncrystallographic icosahedral type, in particular, close to the particles’ surface. This noncrystallographic structure may well explain...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2008