Materials Literature
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Abstract The amino acid esters of hydroxypropyl cellulose (HPC) [R′ = H ( 2a ), CH 3 ( 2b ), CH 2 CH(CH 3 ) 2 ( 2c ), CH 2 CONH 2 ( 2d ), CH 2 CH 2 CONH 2 ( 2e ), CH 2 CH 2 CH 2 CH 2 NHOCOC(CH 3 ) 3 ( 2f )] were synthesized in good yield by the reaction of t ‐butoxycarbonyl ( t ‐Boc)‐protected amino acids with hydroxy…
We report a study on the static and dynamic fatigue behavior of unidirectional, aligned single-walled carbon nanotube (SWCNT) ropes. By bench marking against the behavior of graphite fiber, it is found that the static fatigue strength of SWCNT ropes is at least twice that of graphite fiber within 104s and is similar t…
Formation of Cu(II) complexes of 1‐alkyl‐2‐ethylimidazoles (where alkyl=propyl, butyl, pentyl, hexyl, and octyl) has been studied by using the liquid‐liquid partition method, at 25°C and a fixed ionic strength of the aqueous phase (I=0.5; (HL)NO3, KNO3). The complexes were extracted with 2‐pentanone, 2‐butanol, isoamy…
TiO 2 (0–20 mol%)‐3 mol% yttria‐stabilized zirconia (3YSZ) ceramics were prepared by a solid‐state reaction. With increasing TiO 2 content in 3YSZ, the structure of the main phase changed from a monoclinic, tetragonal, and cubic mixture to a tetragonal single phase. Increasing TiO 2 content in 3YSZ caused an increase…
Stress-induced nucleation of nanoscale grains (nanograins) in deformed nanocrystalline metals and ceramics is theoretically described as a process initiated by intergrain sliding and/or lattice slip. The nanograin nucleation occurs through splitting and migration of grain boundaries containing disclination dipoles pro…
Nanocomposite powders comprising Sm–Co–Fe intermetallic phases and Fe(Co) were synthesized by high-energy ball milling and were consolidated into bulk magnets by the spark-plasma sintering (SPS) technique. While the microstructure of the SPS samples was characterized by transmission electron microscopy (TEM), the solu…
Abstract A technique is described for the preparation of arborescent graft copolymers containing poly( tert ‐butyl methacrylate) (PtBMA) segments. For this purpose, tert ‐butyl methacrylate is first polymerized with 1,1‐diphenyl‐2‐methylpentyllithium in tetrahydrofuran. The graft copolymers are obtained by addition of…
Der Platz in den Zwischenräumen: Geordnete makroporöse Calcit-Einkristalle mit einstellbarer Orientierung und definierten Nanomustern entstehen, wenn amorphes CaCO3 in ein Kolloidkristalltemplat aus Polymerkügelchen eingelagert wird (siehe Bild). Diese Strategie könnte zu funktionellen Einkristallmaterialien führen un…
Abstract This work aimed at the development of bioactive polymeric materials to be used for targeted drug delivery and tissue engineering applications. The proposed strategy was based on the design of macromolecular systems whose functionality can be easily modified. Polyesters containing side‐chain end capped by prim…
A new magnetoelectric hybrid device composed of a nanoparticulate magnetostrictive iron oxide-cobalt ferrite film on a piezoelectric lead zirconic titanate crystal serving as both substrate and straining medium is described. Nano-Fe3O4∕CoFe2O4 particles, ranging from 5to42nm, were prepared using a variation of the sol…
Electronic-phase competition has been investigated for single crystals of half-doped bilayer-structure manganites, $\mathrm{Pr}{({\mathrm{Sr}}_{1\ensuremath{-}y}{\mathrm{Ca}}_{y})}_{2}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ $(0\ensuremath{\leqslant}y\ensuremath{\leqslant}1.0)$, with controlled one-electron bandwidth $(W)$.…
Microstructural evolution of silicon nitride (Si 3 N 4 ) and SiAlON materials and its influence on creep resistance is reviewed. Grain size, grain morphology, and the ratio of α‐ to β‐phase grains play a part in resistance to creep. The glassy, intergranular phase typically has the strongest influence on creep. Creep…
First-principles calculations based on density functional theory are performed to study structural and electronic properties of crystalline bundles of (n,0) zigzag and (0,n) armchair-type single-walled boron nanotubes (SWBNT) with small diameter, about 4-6. The results predict a modification in the properties of SWBNT…
Abstract The real‐time measurement of the morphology of immiscible polymer blends based on polypropylene (PP) and polyamide 6 (PA6) was performed during melt blending in a twin‐screw extruder. The disperse phase particle size and concentration were obtained in‐line with an optical device placed at the die exit. To val…
Abstract We have made a study of the development of phase morphology of an immiscible blend(75/25)(polypropylene–polyamide‐6) for different types of continuous mixers including (i) Buss Kneader, (ii and iii) modular intermeshing corotating and counter‐rotating twin screw extruders, and (iv) NEX‐T Kobelco Continuous Mi…
The domain structure and phase symmetry of the (1−x)Pb(Mg1∕3Nb2∕3)O3–xPbTiO3 piezoelectric crystals with a composition close to the morphotropic phase boundary (MPB) between the rhombohedral R3m and monoclinic Pm phases (x≅0.3) have been studied by polarized light microscopy. It is found that poling by an electric fie…
A quantum-cutting (QC) phosphor K2GdF5:Eu3+ shows poor optical absorption and a theoretical quantum efficiency (QE) of 107% in the ultraviolet (UV) and vacuum ultraviolet (VUV) excitation spectral ranges. Pr3+ was codoped as a sensitizer in K2GdF5:Eu3+, thus increasing the absorption in the UV and VUV spectral regions…
The coupling effects of rotational and translational Brownian motion in anisotropic macromolecules result in differentiated diffusion constants parallel and perpendicular to the particle’s long axis in the short term. Investigations of these dynamics allow for a greater understanding of how directional alignment can b…
BACKGROUND: We have developed magnetite cationic liposomes (MCLs) and applied them as a mediator of local hyperthermia. MCLs can generate heat under an alternating magnetic field (AMF). In this study, the in vivo effect of hyperthermia mediated by MCLs was examined using 7,12-dimethylbenz(a)anthracene (DMBA)-induced r…
With the ongoing miniaturization of structures and devices down to the nanometer scale, we notice concomitant escalation of atoms located at surfaces or interfaces. Presence of surfaces and interfaces generates stresses in nanoscale structures that can easily exceed 1GPa. We developed and applied a method for measurin…