Materials Literature
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Abstract NaCl significantly enhanced the longer oligoarginine formation in the oligomerization of L ‐arginine activated by N,N ′‐carbonyldiimidazole (CDI) in homogeneous aqueous solution. The optimal concentration of NaCl for the highest yield of longer oligoarginine formation is around 1 M . It is suggested that the…
VH and HV depolarized hyper-Rayleigh scattering spectra were measured for liquid solutions of dipolar CH3CN in nondipolar C2Cl4 at T=300 K. The VH spectrum contains a strong narrow peak due to a slowly relaxing longitudinal orientation mode. This peak is absent in the HV spectrum, and it disappears from the VH spectru…
This work presents a study of elemental composition and preponderant structure of human dental calculus, as they mature in the mouth for a period of 1 year. The synchrotron radiation X-ray fluorescence technique using a white beam was employed as an analytical method. The set of samples were extracted from different d…
Abstract Summary: In this article, we designed and synthesized novel segmented poly(carbonate urethane)s containing both hydrophobic fluorinated alkyl group and hydrophilic phosphatidylcholine polar head groups on the side chain. The contact angle measurement, XPS, together with ATR‐IR investigation indicated a revers…
Beryllium is considered to be a candidate material for the first wall of nuclear fusion plasma experiments, e.g. ITER. In this application, the interaction of beryllium with oxygen is important for two reasons. One aspect is the reaction of hot beryllium with air in case of a catastrophic leak, the other is the action…
Recently, the collinear or noncollinear character of the magnetic structure of gadolinium tetraboride $({\mathrm{GdB}}_{4})$, laying the magnetic moments in the $ab$ plane, becomes a matter of controversy. In the present study, the observations obtained from resistivity, specific heat, and magnetic susceptibility meas…
Anti-Stokes/Stokes asymmetries under surface enhanced Raman scattering (SERS) conditions are studied for a wide variety of SERS-active media and different analytes. Evidence is provided for the existence of underlying resonances that create these asymmetries. We show here that these resonances are associated with the…
The possible coexistence of ferromagnetism and charge/orbital order in ${\mathrm{Bi}}_{3∕4}{\mathrm{Sr}}_{1∕4}\mathrm{Mn}{\mathrm{O}}_{3}$ has been investigated. The manganite ${\mathrm{Bi}}_{0.75}{\mathrm{Sr}}_{0.25}\mathrm{Mn}{\mathrm{O}}_{3}$, with commensurate charge balance, undergoes an electronic transition at…
Abstract The linking of nanosized clusters is especially interesting if the following conditions are fulfilled: The nano‐objects, as in the present case, have interesting properties like well‐defined functionalized external and internal surfaces, linking processes follow well‐defined rules and occur with respect to fo…
This paper presents a study of the deformation behavior of single-walled carbon nanotubes (SWNTs) subjected to extension and twist. The interatomic force description is provided by the Tersoff-Brenner potential for carbon. The rolling of a flat graphene sheet into a SWNT is first simulated by minimizing the energy per…
Heat-capacity measurements of the sodium nitrite confined in a nanoscale porous glass matrix show that the intermediate incommensurate phase, present in the bulk, has disappeared and that the first-order ferroelectric transition becomes suppressed and gradual. The ferroelectric transition temperature is shifted consid…
A polymer surface with excellent blood compatibility has been produced via spontaneous surface segregation of a block copolymer. The water-soluble polymer block (PME3MA) spontaneously segregates into hydrophobic and hydrophilic environments (see Figure), causing the blocks to expel biological substances including prot…
Abstract Summary: Dielectric relaxation spectroscopy was used to monitor the development of crystallinity in poly( L ‐lactic acid) (PLLA) at 80 °C. The continuous shifting of the main loss peak towards lower frequencies was modelled considering the evolution of three relaxation processes: the α‐process of the bulk‐lik…
Resonance Raman spectra of semiconducting and metallic single-wall carbon nanotube bundles have been investigated in the spectral range between 600 and $1100\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{\ensuremath{-}1}$, which is associated with intermediate frequency modes. A large range of nanotube diameters correspond…
Abstract Polyamidoamine dendrimers up to the fourth generation have been grown with unprecedentedly high loading within the channels of pore‐expanded (10.6 nm) MCM‐41 silica. In‐depth characterization using nitrogen adsorption, solid‐state NMR, FTIR, thermogravimetry, and elemental analysis showed that the dendrimers…
Abstract Layered‐silicate nanoparticles, when distributed within the matrix of a fiber‐reinforced polymer (FRP), can retard the diffusion of environmental moisture and other chemicals to the fiber–matrix interface where their presence can result in delamination and fiber weakening. Thus, the use of nanoparticles helps…
Abstract Pine kraft lignin was sedimented from an aqueous NaOH solution (pH 13) onto flax fibers by submerging flax fiber mats in the alkaline solution for 5 min. This treatment has been used to improve the interfacial interactions between the hydrophilic flax and a hydrophobic soy‐oil‐based liquid molding resin. The…
ZnO nanoparticles embedded into SiO(2) by an ex situ method were shown to result in stable green emission with a peak at 510 nm compared to the normal peak at 495 nm from micron-sized ZnO powders. Green emission from ZnO nanoparticles was completely suppressed when they were embedded in SiO2 doped with Eu3+. Instead,…
Abstract Summary: Oligo(ethylene glycol) methacrylate (OEGMA) was grafted from silicon wafer surfaces by surface‐initiated atom transfer radical polymerization (ATRP) with Cu I Br/2,2′‐bipyridine (bpy) as a catalyst and various water/alcohol mixtures as solvents. The ellipsometric thickness of the poly(OEGMA) layer on…
We investigate statistics of dynamical exchange events in coarse-grained models of supercooled liquids in spatial dimensions d=1, 2, and 3. The models, based upon the concept of dynamical facilitation, capture generic features of statistics of exchange times and persistence times. Here, distributions for both times ar…