Materials Literature
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The three near-infrared-emitting cationic iridium(III) complexes [Ir(pbq- g ) 2 (N ∧ N)] + PF 6 – (pbq- g = phenylbenzo[ g ]quinoline; N ∧ N = bipyridine ( 1 ), 1,10-phenanthroline ( 2 ), 4,7-diphenyl-1,10-phenanthroline ( 3 )) have been demonstrated as phosphorescent dyes in live cell imaging. These complexes with di…
The development of a stain-resistant and pressure-stable textile is desirable for consumer and industrial applications alike, yet it remains a challenge that current technologies have been unable to fully address. Traditional superhydrophobic surfaces, inspired by the lotus plant, are characterized by two main compone…
Two-in-one: A biological supercapacitor—a combination of an electrochemical capacitor and an enzymatic fuel cell—is presented. Both the capacitor and the biofuel cell are built from nanomaterials, namely, polyaniline/carbon nanotube composites and redox enzyme/gold nanoparticle assemblies. The biosupercapacitor is sel…
Carbon nanotube sponges and aligned arrays are seamlessly integrated into numerous possible configurations such as series, parallel, package, and sandwich complex structures, leading to significantly broadened stress plateau and enhanced energy dissipation.
A controllable optical anisotropy in CVD graphene is shown. The transparency in the visible range of pre-strained CVD graphene exhibits a periodic modulation as a function of polarization direction. The strain sensitivity of the optical response of graphene demonstrated here can be effectively utilized towards novel u…
Self-assembly of a series of carboxylic acid-functionalized naphthalene diimide (NDI) chromophores with a varying number (n=1-4) of methylene spacers between the NDI ring and the carboxylic acid group has been studied. The derivatives show pronounced aggregation due to the synergistic effects of H-bonding between the…
A red-emissive barbituric acid-functionalized tetraphenylethene derivative (TPE-HPh-Bar) was designed and synthesized. TPE-HPh-Bar exhibits the effect of twisted intramolecular charge transfer due to the interaction of its donor and acceptor units. Whereas TPE-HPh-Bar emits faintly in solution, it becomes a strong emi…
We present a first-principles investigation of structural and elastic properties of experimentally observed phases of bulk SrRuO3 - namely orthorhombic, tetragonal, and cubic - by applying density functional theory (DFT) approximations. First, we focus our attention on the accuracy of calculated lattice constants in o…
Recent experiments suggest that Bi impurities segregate to form bilayer films on Ni and Cu grain boundaries but do not segregate in Fe. To explain these phenomena, we study the total energies of Bi films on transition metal (TM) $Σ$3(111) and $Σ$5(012) GBs using density functional theory. Our results agree with the ob…
The mechanical behavior of crystals is dominated by dislocation networks, their structure and their interactions with impurities or thermal phonons. However, in classical crystals, networks are usually random with impurities often forming non-equilibrium clusters when their motion freezes at low temperature. Helium pr…
The structural and magnetic properties of two mixed-valence cobaltites with a formal population of 0.30 Co${}^{4+}$ ions per f.u., (Pr${}_{1\ensuremath{-}y}$Y${}_{y}$)${}_{0.7}$Ca${}_{0.3}$CoO${}_{3}$ ($y=0$ and 0.15), have been studied down to very low temperatures by means of high-resolution neutron diffraction, SQU…
We report the design and synthesis of two porous graphene frameworks (PGFs) prepared via covalent functionalization of reduced graphene oxide (RGO) with iodobenzene followed by a C-C coupling reaction. In contrast to RGO, these 3D frameworks show high surface area (BET, 825 m(2) g(-1)) and pore volumes due to the effe…
We present herein a short tripeptide sequence (Lys-Phe-Gly or KFG) that is situated in the juxtamembrane region of the tyrosine kinase nerve growth factor (Trk NGF) receptors. KFG self-assembles in water and shows a reversible and concentration-dependent switching of nanostructures from nanospheres (vesicles) to nanot…
Ordered mesoporous carbons with high pore accessibility are of great interest as electrodes in energy conversion and storage applications due to their high electric and thermal conductivity, chemical inertness, and low density. The metal- and halogen-free synthesis of gyroidal bicontinuous mesoporous carbon materials…
The bursting of bubbles at an air/liquid interface is a familiar occurrence important to foam stability, cell cultures in bioreactors and mass transfer between the sea and atmosphere. Here we document the hitherto unreported formation and dispersal into the water column of submicrometre oil droplets following bubble b…
We present angle resolved photoemission spectroscopy measurements of the surface states on in-situ grown (111) oriented films of Pb$_{1-x}$Sn$_{x}$Se, a three dimensional topological crystalline insulator. We observe surface states with Dirac-like dispersion at $\barΓ$ and $\bar{M}$ in the surface Brillouin zone, supp…
Heart disease is the leading cause of mortality in many industrialized nations and is often related to irregularities in electrical function that can radically damage cardiac functioning. The aim of this study is to develop a novel therapeutic hybrid scaffold that can couple electrical, mechanical, and biological prop…
We report a strong effect of interface-induced magnetization on the transport properties of magnetic tunnel junctions consisting of ferromagnetic manganite La0.7Ca0.3MnO3 and insulating cuprate PrBa2Cu3O7. Contrary to the typically observed steady increase of the tunnel magnetoresistance with decreasing temperature, t…
A new measurement technique for the spin Seebeck effect is presented, wherein the normal metal layer used for its detection is exploited simultaneously as a resistive heater and thermometer. We show how the various contributions to the measured total signal can be disentangled, allowing to extract the voltage signal s…
We present an ab-initio real-time-based computational approach to study nonlinear optical properties in condensed matter systems that is especially suitable for crystalline solids and periodic nanostructures. The equations of motion and the coupling of the electrons with the external electric field are derived from th…