Materials Literature
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In this letter, we examine the effect of charge trapping on geminate recombination and organic photovoltaic performance using a Monte Carlo model. We alter the degree of charge trapping by considering energetic disorder to be spatially uncorrelated or correlated. On correlating energetic disorder, and so reducing the…
The photovoltaic properties, charge transport, and morphology of a series of diblock conjugated copolymers, poly(3-butylthiophene)- b -poly(3-octylthiophene) (P3BT- b -P3OT), were investigated as a function of block composition. Bulk heterojunction solar cells comprising blends of P3BT- b -P3OT and [6,6]-phenyl-C 71 -…
Abstract The in situ morphology change upon thermal annealing in bulk heterojunction blend films of regioregular poly(3‐hexylthiophene) (P3HT) and 1‐(3‐methoxycarbonyl)‐propyl‐1‐phenyl‐(6,6)C61 (PCBM) is measured by a grazing incidence X‐ray diffraction (GIXD) method using a synchrotron radiation source. The results s…
The synthesis and characterization of dimeric, aryl-substituted bis(imino)pyridine iron dinitrogen complexes is described. In contrast to reduction with sodium amalgam where bis(chelate) iron compounds were isolated, stirring ((Ar)PDI)FeBr(2) or ((Me)BPDI)FeBr(2) (PDI = 2,6-(ArN=CMe)(2)C(5)H(3)N; Ar = 2,6-Et(2)-C(6)H(…
Aiming at a better understanding of the interaction of ionic liquid (IL) thin films with oxide supports, we have performed a model study under ultrahigh vacuum (UHV) conditions. We apply infrared reflection absorption spectroscopy (IRAS) in combination with density functional theory (DFT). Thin films of 1-butyl-3-meth…
A family of self-assembly lanthanide−organic coordination polymers with both rigid and flexible ligands formulated as {[Ln 2 (Hpimda) 2 (μ 4 -C 2 O 4 ) · 2H 2 O] · 4H 2 O} n (Ln = Sm ( 1 ), Eu ( 2 ), Tb ( 3 ), Dy ( 4 ), Ho ( 5 ), Er ( 6 ), H 3 pimda = 2-propyl-1H-imidazole-4,5-dicarboxylic acid) has been synthesized f…
Highly porous homoleptic Ni(bpb) and Zn(bpb) materials have been obtained by reaction of nickel(II) and zinc(II) salts with the deprotonated form of the 1,4-(4-bispyrazolyl)benzene ligand (H 2 bpb). Ab-initio structure solution methods and thermodiffractometry have allowed the determination of their crystal structures…
The rate of tumor recurrence post resection suggests that there are underlying molecular changes in nearby histologically normal tissue that go undetected by conventional diagnostic methods that utilize contrast agents and immunohistochemistry. MALDI MS is a molecular technology that has the specificity and sensitivit…
Abstract Here, a new methodology for analyzing the charge‐density dependence of carrier mobility in organic semiconductors, applicable to the low‐charge‐density regime (1014–1017 cm−3) corresponding to the operation conditions of many organic optoelectronic devices, is reported. For the P3HT/PCBM blend photovoltaic de…
This review article surveys the electronic and photophysical properties of conjugated organometallic polymers built upon the title compound and its related derivatives focussing primarily on systems investigated in our laboratories. The general structure of the polymers is (trans-bis(para-ethynylbenzene)bis(phosphine)…
We address the issue of the self energy of the mobile ions in electrolyte solutions within a general Gaussian renormalized fluctuation theory using a field-theoretic approach. We introduce the Born radii of the ions in the form of a charge distribution allowing for different Born radii between the cations and anions.…
Nanoembossed mesoporous LiFePO 4 microspheres were first synthesized by a template-free hydrothermal process. These microspheres show a quite uniform size distribution of ∼3 μm and are composed of many densely aggregated ∼100 nm nanoparticles and interconnected nanochannels. This mesoporous structure can allow sucrose…
We study proximity-induced superconductivity on the surface of a topological insulator (TI), focusing on unconventional pairing. We find that the excitation spectrum becomes gapless for any spin-triplet pairing, such that both subgap bound states and Andreev reflection is strongly suppressed. For spin-singlet pairing,…
Abstract A freestanding membrane composed of a nanofiber network of a graphene–polymer nanocomposite is fabricated by electrospinning and applied as an optical element in fiber lasers. The functionalization of graphene with conjugated organic molecules provides a handle for improving mechanical and thermal properties…
Alzheimer's disease (AD) is an age-related, progressive degenerative disorder that is characterized by synapse and neuron loss in the brain and the accumulation of protein-containing deposits (referred to as 'senile plaques') and neurofibrillary tangles. Insoluble amyloid beta-peptide (Abeta) fibrillar aggregates foun…
The elevated temperature bolting steel Durehete 1055, manufactured by Corus Speciality Steels over several decades for power plant applications, has seen a number of changes to the original alloy design. Durehete 1055 (1%Cr 1%Mo 0.75%V TiB) is the most metallurgically complex of the trademarked Durehete range. Signifi…
We investigate a tracer particle moving on a two-dimensional square lattice created by network formers (NF). The positions of all network formers are randomly displaced by a small amount from the nodes of the network. Each NF can be in a "floppy" or "rigid" state, depending on the number of bonds connecting it to neig…
Abstract Along with basic physicochemical properties, the morphology of sol‐gel materials, both on the macro‐, meso‐, and nanoscale, controls function and utility. Referring to recent achievements, we focus on the relation between form and activity for functional silica‐based materials to elucidate a few general conce…
Abstract The origin of the Boson peak was investigated using Raman spectroscopy and ab initio calculations. Low frequency Raman active vibrational modes of different branchy‐, ring‐ and cage‐like AsmSn nanoclusters were calculated and compared to experimentally determined Raman spectra of AsxS100‐x glasses with differ…
Morphological evolution of poly( l -lactic acid) (PLLA) crystals obtained via crystallization at T c = 85 to 97 °C from 0.1% solutions in mixed xylene was closely followed via transmission electron microscopy. Upon stirring-enhanced nucleation after the adopted incubation scheme ( t i = 10 h at T i = 90 °C), there eme…