Materials Literature
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Formabhängig: Bei fluoreszierenden Quantenpunkt-Nanokügelchen und -stäbchen mit identischen hydrodynamischen Größen und Oberflächeneigenschaften, aber unterschiedlichen Aspektverhältnissen zeigen bei der In-vivo-Echtzeitbildgebung von Brustkrebstumoren die Nanostäbchen eine schnellere Verteilung als Nanokügelchen verg…
Si nanocrystals (Si-NCs) dispersible in polar liquid without surface functionalization by organic molecules have been realized by simultaneously doping n and p type impurities. We show that the codoped Si-NCs are stable in methanol for more than five months, while intrinsic Si-NCs prepared by the same procedure form l…
Isotopic Mg 11 B 2 has been deuterated at 400 °C and 800 bar, with the production of β-Mg( 11 BD 4 ) 2 observed by in situ neutron diffraction. A natural MgB 2 sample has been deuterated under similar conditions and studied ex situ by high resolution X-ray synchrotron diffraction. In both cases, quantitative phase ana…
Heilt euch selbst! Durch schichtweisen Aufbau erzeugte mehrschichtige Polyelektrolytüberzüge, die unter Umgebungsbedingungen mechanisch robust sind, können selbständig über zehn Mikrometer tiefe und breite Schnitte in ihrer Struktur reparieren, wenn sie in Wasser eingelegt oder mit Wasser besprüht werden. Diese Selbst…
We report a robust method for synthesis of monodisperse PbSeTe single ternary alloy and core/shell heterostructured nanocubes, respectively. The key synthetic strategy to produce such different classes of nanocubes is to precisely control the time of reaction and successive growth. The crystallinity, shape/size distri…
This paper focuses on the spectroscopic studies on coumarin 153 (C153) dye encapsulated semiconducting [poly( N -vinylcarbazole) (PVK)] polymer nanoparticles using steady state and time-resolved spectroscopy. A significant blue shift (40 nm) and the enhancement of PL intensity of C153 dye are observed due to the encap…
The radial distribution function of liquid water, as obtained by the computer simulations of several classical models of water, is re-examined herein and shown to display two intriguing features. These consist of a compact ‘three-peaks structure’ over three molecular diameters, which is followed by an apparent loss of…
Selective exposure to visible light is used to permanently trim the resonant wavelengths of coupled ring-resonator filters and delay-lines realized on a chalcogenide As2S3 platform. Post-fabrication manipulation of the circuit parameters has proved an effective tool to compensate for technological tolerances, targetin…
We present measurements of the electronic properties of graphene using a repositionable micro four-point probe system, which we show here to have unique advantages over measurements made on lithographically defined devices; namely speed, simplicity and lack of a need to pattern graphene. Measurements are performed in…
XeF 2 treatment of aluminum and alumina surfaces is known to produce hydrophilic surfaces. There is however poor knowledge of the chemical nature of these surfaces. Using infrared absorption and X-ray photoelectron spectroscopy, the formation of highly hydrophilic AlF 3 and AlO x F y surface layers is identified upon…
A previously overlooked step of carbon nanotube (CNT) growth, incorporating C atoms into the CNT wall through the CNT-catalyst interface, is studied by density functional theory calculations. A significant barrier for incorporating C atoms into the CNT wall (∼2 eV for most used catalysts, Fe, Co, and Ni) is revealed a…
The chemical enhancement effects in surface-enhanced Raman scattering of p-aminothiophenol (PATP, it is also called p-mercaptoaniline or p-aminobenzenthiol) adsorbed on coinage metal surfaces with single thiol end or trapped into metal-molecule-metal junctions with both thiol and amino groups have been studied by dens…
Macroscopic molecular recognition observations were realized using polyacrylamide-based gels modified with α-cyclodextrin (α-CD), β-cyclodextrin (β-CD), 1-naphthylmethyl (1Np), and 2-naphthylmethyl (2Np) moieties, which are denoted as αCD(x)-gel, βCD(x)-gel, 1Np(y)-gel, and 2Np(y)-gel, where x and y indicate the mol %…
The excited-state properties of unsubstituted ortho-phenylene oligomers have been studied using TD-DFT. Calculations of vertical transitions at the helical ground-state geometries are in good qualitative agreement with the experimental UV-vis spectra. In the excited state, the spring-like compounds compress; for the l…
Future applications of discotic liquid crystals (DLCs) in electronic devices depend on a marked improvement of their conductivity properties. We present a study of 2,3,6,7,10,11-hexakishexyloxytriphenylene (HAT6) and show how local conformation, structural defects, and thermal motions on the picosecond time scale stro…
The self-assembly and gelating ability of a set of N-alkyl-(R)-12-hydroxyoctadecylammonium chlorides (NCl-n, where n = 0-6, 18 is the length of the alkyl chain on nitrogen) are described. Several are found to be ambidextrous (gelating both water and a variety of organic liquids) and very efficient (needing less than c…
The evolution of optical properties of two types of core/multishell nanocrystals (NCs)–type A (CdSe/CdS/Zn 0.5 Cd 0.5 S/ZnS) and type B (CdSe/CdS/Zn x Cd 1– x S/ZnS)—with an increase of shell thickness from 3.5 to 15.5 monolayers (MLs) has been studied. When the shell thickness was 9.5 MLs and more, the stability woul…
MicroRNAs (miRNAs) are small non-coding RNAs that play numerous important roles in physiology and human diseases. During animal development, many miRNAs are expressed continuously from early embryos throughout adults, yet it is unclear whether these miRNAs are actually required at all the stages of development. Curren…
Abstract Four types of drug nanoparticles (NPs) based on amphiphilic hyperbranched block copolymers were developed for the delivery of the chemotherapeutic doxorubicin (DOX) to breast cancer cells. These carriers have their hydrophobic interior layer composed of the hyperbranched aliphatic polyester, Boltorn ® H30 or…
A novel photoactivated artificial muscle model unit is reported. Here we show that organic/inorganic hybrid nanosheets reversibly slide horizontally on a giant scale and the interlayer spaces in the layered hybrid structure shrink and expand vertically by photoirradiation. The sliding movement of the system on a giant…