Materials Literature
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Many fibers in biomaterials such as tendon, elastin, or silk feature a nonlinear stiffening behavior of the stress-strain relationship, where the rigidity of the material increases severely as the material is being stretched. Here we show that such nonlinear stiffening is beneficial for a fiber's ability to withstand…
Hole transfer dynamics of Atto647N sensitized p-type NiO nanoparticle (NP) thin films is investigated using both ensemble-averaged and single-molecule spectroscopy techniques. The rate of hole transfer is dependent on the processing conditions and is enhanced when the NiO is pre-annealed in air as compared to vacuum.…
Aqueous poly(p-phenylene-vinylene) (PPV):CdxHg1−xTe nanocrystal (NC) hybrid solar cells are prepared with heat-introduced aggregation and growth of the NCs. The morphology of the active layer is easily controlled by tuning the composition of the donor and acceptor and the charge carrier mobility is largely improved af…
High-pressure Raman scattering and synchrotron angle-dispersive X-ray diffraction studies have been performed on liquid ammonia hemihydrates (2NH3·H2O) at room temperature up to 41.0 GPa. The results demonstrate that liquid 2NH3·H2O transforms into a solid phase at 3.5 GPa. Upon increasing pressure, a solid-solid phas…
Green-emitting Ba 3 Si 6 O 12 N 2 :Eu 2+ phosphors were synthesized by Ba 3 SiO 5 :Eu 2+ precursor method, and their phase, morphology, photoluminescence (PL) properties were investigated. Contrary to the solid-state reaction technique, the precursor method yielded the single phase Ba 3 Si 6 O 12 N 2 :Eu 2+ with a hig…
Single-component room-temperature discotic nematics have been achieved within large temperature ranges by introducing an attraction-enhancing protrusion onto hexa(phenylethynyl)benzenes. X-ray diffraction investigations revealed the nematic phases of these new discotic nematic materials to be cybotactic.
Precise control over folded conformations of synthetic polymers is highly desirable in the development of functional nanomaterials for diverse applications. Introducing monomers capable of strong intramolecular hydrogen bonding is a promising route to achieve this control. In the present work we report the use of Wang…
We present experimental results on the bulk flexoelectric coefficients e and effective elastic coefficients K of non-symmetric bimesogenic liquid crystals when the number of terminal and lateral fluoro substituents is increased. These coefficients are of importance because the flexoelastic ratio e/K governs the magnit…
The chemical compatibility of Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) electrodes with ceria based electrolytes is investigated under solid oxide fuel cell (SOFC) operation conditions. BSCF reacts with both Ce 0.9 Gd 0.1 O 1.95 (GDC) and Ce 0.8 Sm 0.2 O 1.95 (SDC) at 900°C, forming barium cerate (Ba x Ce 1-y M y O 3 ,…
The effect of dopants (over a wide concentration range from 0.5 to 10 mol%), namely s-, p-, d- and f-block elements (Mg, Sb, Pd and La) on the growth process, crystalline perfection, external morphology, vibrational patterns, XRD profile and second order nonlinear optical (NLO) properties of potassium dihydrogen phosp…
Mixed alkali and alkaline earth oxide glasses of RO-Li2O-Na2O-K2O-B2O3(R = Zn, Mg, Sr and Ba) system were studied by electron paramagnetic resonance (EPR) and optical absorption spectroscopy. Cu2+ and VO2+ ions were used as the spin probes. The glasses containing 1 mole% of Cu2+ and 2mole% of VO2+ were prepared by the…
The incorporation of stearic acids into peripherally charged dendronized polymers (denpols) and their release, initiated by external triggers, is characterized in solution. Using continuous wave electron paramagnetic resonance (CW EPR) spectroscopy on spin-labeled stearic acid derivatives it is found that – depending…
Here we report the synthesis of silica coated NaYF4:Yb/Tm nanocomposites, with a covalent coating of 1,8-dihydroxy-3-methylanthraquinone (DHMA), which has high ability to produce reactive oxygen species (ROS) and fluorescein isothiocyanate (FITC) for downconverting imaging. Upon excitation by near-infrared light, the…
NiO hierarchical structure was synthesized via a facile template-engaged solvothermal reaction of Mg5(CO3)4(OH)2·4H2O and Ni(NO3)2·6H2O, followed by annealing Ni-base precursor at high temperature in air. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy…
The rheological properties of a hierarchically structured supramolecular soft material are mainly determined by the structure of its network. Controlling the thermodynamic driving force of physical gels (one type of such materials) during the formation has proven effective in manipulating the network structure due to…
This paper presents tensile properties of a polyimide thin film used in electronic devices. Tensile tests were performed to determine Young's modulus, proportional limit, yield stress, ultimate tensile strength and elongation of the polyimide film. Effects of strain rate and temperature on the tensile properties were…
Poly- and single-crystalline Ni nanowire arrays showing ultrahigh axial squareness are fabricated by direct-current electrodeposition in pores of anodic aluminum oxide templates. High voltage is shown to be the key in order for Ni nanowires to have a (220) preferred orientation. 2-Dimensional nucleation theory is used…
Glass transition temperature(Tg) of 20BaO·10Fe2O3·xWO3·(70−x)V2O5 glasses showed a step-by-step increase from 339 to 470°C when x was increased from 0 to 50, together with a concordant increase in crystallization temperature(Tc) from 406 to 531°C. Plot of Tg against quadrupole splitting(Δ) of FeIII in the Mössba…
A major clinical problem of high relevance in the cardiovascular field is late stent thrombosis after implantation of drug eluting stents (DES). Clinical widely used DES currently utilize durable polymer coatings, which can induce persistent arterial wall inflammation and delayed vascular healing resulting in an impai…
This paper describes the investigation of manganese modified CdTe/CdS quantum dots as a fluorescence probe for trace copper detection. Manganese modified CdTe/CdS quantum dots were prepared in aqueous solution and were characterized by ultraviolet-visible absorbance, fluorescence spectra, transmission electron microsc…