Materials Literature
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The apatite La 10 - x □ x (Ge 5.5 Al 0.5 O 24 )O 2.75 - 1.5 x (10 − x = 9.80, 9.75, 9.67, 9.60, 9.50, and 9.40) series has been prepared and the single phase existence range has been established, 9.75 ≥ 10 − x ≥ 9.45. The hexagonal crystal structures of La 9.5 □ 0.5 (Ge 5.5 Al 0.5 O 24 )O 2 have been determined at roo…
Thermosensitive micelles and vesicles in water were prepared using narrowly distributed polystyrene- b -poly( N -isopropylacrylamide) (PS- b -PNIPAM) diblock copolymers, and the conformational changes of PNIPAM blocks in the coronas of micelles and vesicles were investigated by a combination of static and dynamic lase…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation A. E. Pap, K. Kordás, G. Tóth, J. Levoska, A. Uusimäki, J. Vähäkangas, S. Leppävuori, T. F. Georg…
Out of the blue: Photoinduced magnetism in polymeric “Prussian Blue” analogues is a well understood phenomenon that can even occur near room temperature. The lessons learned are now being transferred to the synthesis of molecular cyanide-bridged single-molecule magnets (see picture; Mo yellow, C black, N blue, Cu purp…
Using time-resolved $1s$-$2p$ excitonic Lyman spectroscopy, we study the orthoexciton-to-paraexcitons transfer, following the creation of a high density population of ultracold $1s$ orthoexcitons by resonant two-photon excitation with femtosecond pulses. An observed fast exciton-density dependent conversion rate is at…
We analyze the scaling of avalanche precursors in the three dimensional random fuse model by numerical simulations. We find that both the integrated and non-integrated avalanche size distributions are in good agreement with the results of the global load sharing fiber bundle model, which represents the mean-field limi…
An understanding of osteoblast response to surface topography is essential for successful bone tissue engineering applications. Alumina has been extensively used as a substrate for bone tissue constructs. However, current techniques do not allow precise surface topography and orientation of the material. In this resea…
Synthesis of a novel thermally stable mesoporous ceria-titania phase using a neutral templating route is reported. The as-made inorganic-template hybrid mesostructured matrix showed a broad low-angle XRD peak characteristic of mesoporous materials. Careful thermal treatment of the matrix allowed the subsequent densifi…
Proteins, which are bioactive molecules, adsorb on implants placed in the body through complex and poorly understood mechanisms and directly influence biocompatibility. Molecular dynamics modeling using empirical force fields provides one of the most direct methods of theoretically analyzing the behavior of complex mo…
By means of ab initio simulations, we investigate the phonon band structure and electron-phonon coupling in small 4-A diameter nanotubes. We show that both the C(5,0) and C(3,3) tubes undergo above room temperature a Peierls transition mediated by an acoustical long wavelength and an optical q=2k(F) phonon, respective…
We develop a semiclassical kinetic theory for electron spin relaxation in semiconductors. Our approach accounts for elastic as well as inelastic scattering and treats Elliott-Yafet and motional-narrowing processes, such as D'yakonov-Perel' and variable g-factor processes, on an equal footing. Focusing on small spin po…
We present ab-initio calculations of the electronic structure of small Fe clusters (1-9 atoms) on Ni(001), Ni(111), Cu(001) and Cu(111) surfaces. Emphasis is given on the spin moments, and their dependence on cluster size and shape. We derive a simple quantitative rule, which relates the moment of each Fe atom linearl…
Kinetics of systems specified by anharmonic, nonconservative and nonlocally coupled model Hamiltonians is reproduced in the Fokker-Planck and imaginary time Schrodinger equation techniques with subsequent symplectic integration. Test solutions focused on dielectric response in ferroelectrics demonstrates potential of…
An elongation method based on ab initio quantum chemistry approaches is presented. It allows to study electronic structures and coherent electron transportation properties of single-walled carbon nanotubes (SWCNTs) up to 22nm in length using the hybrid density functional theory. The 22nm long SWCNT, consisting of more…
Although of primary importance in the mechanistic understanding of Zircaloy hydriding, practically nothing is known on the transport properties of hydrogen in zirconia. In this frame the muon, which can be considered as a light hydrogen nuclide, can be used as an analogue and its behavior in zirconia and Zircaloy corr…
The temperature dependences of the dc resistivity and the nonlinear transport properties in pure, Rb-doped, and W-doped blue bronze K$_{0.3}$MoO$_{3}$ single crystals are presented. In comparison with the Rb doping, the W doping has larger effects on the electrical transport properties and the Peierls transition. In p…
First-principles calculations are used to investigate ionicities of boron-boron bonds in B(12) icosahedra. It is observed that the geometrical symmetry breaking of B(12) icosahedra results in the spatial asymmetry of charge density on each boron-boron bond, and further in the ionicity of B(12) icosahedra. The results…
Grafting from via atom transfer radical polymerization (ATRP) was employed for the synthesis of densely grafted molecular brushes. A poly(2-(2-bromopropionyl)oxyethyl methacrylate) (PBPEM) macroinitiator was used to polymerize n -butyl acrylate (BA) with various degrees of polymerization. The brush syntheses proceeded…
We have performed steady-state and time-resolved fluorescence studies on undoped and Mn-doped ZnS nanocrystals with approximately 16 A diameter. While there is no band-edge emission, the intensity of the steady-state blue fluorescence from ZnS surface states decreases upon Mn incorporation, which gives rise to an oran…
We report here a self-cleaning particle coating with antireflection (AR) properties. The coatings were prepared by (1) depositing SiO 2 single-layered particle coatings on polyelectrolyte-modified glass substrates through electrostatic attraction, (2) subsequently depositing another layer of TiO 2 nanoparticles throug…