Materials Literature
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A general theory for the detection of the core-level electronic excitation in anisotropic systems using angular integrated electron energy-loss spectroscopy (EELS) has been presented. Magic angle conditions, at which spectra are independent of specimen orientation, are proved to be valid for all anisotropic systems. D…
We demonstrated the formation of single-crystal-like materials that contain preferentially oriented arrays of lead zirconate titanate (PZT) cube-shaped particles by self-assembly. Hydrothermally synthesized PZT particles with a bulk composition of Zr/Ti = 70/30 were used in making microcrystal arrays. Spreading a susp…
Ultrasonication is a necessary process to make single-walled carbon nanotubes (SWNTs) soluble in aqueous solution with surfactants such as sodium dodecyl sulfate (SDS). However, an understanding of the sonication effects on the electronic and optical properties of SWNTs in aqueous solution is still lacking. Here, we h…
Abstract Dihydroxyl capped biodegradable poly(DTC‐ b ‐PEG‐ b ‐DTC) (BCB) triblock copolymer and poly(TMC‐ b ‐DTC‐ b ‐PEG‐ b ‐DTC‐ b ‐TMC) (ABCBA) pentablock copolymer have been synthesized by PEG and BCB copolymer as macroinitiator in the presence of yttrium tris(2,6‐di‐ tert ‐butyl‐4‐methylphenolate). The copolymers…
We calculate the intershell resistance ${R}_{21}$ in a multiwall carbon nanotube as a function of temperature $T$ and Fermi level ${\ensuremath{\epsilon}}_{\mathrm{F}}$ (e.g., a gate voltage), varying the chirality of the inner and outer tubes. This is done in a so-called Coulomb drag setup, where a current ${I}_{1}$…
To avoid potential ambiguity in the structural determination of native spider silk, we prepared both a nonlabeled peptide with a sequence containing both the polyalanine and the repeated GGA regions, QGAG(A) 6 GGAGA(GGA) 3 GAGRGGLGG ( I ), and the 13 C-labeled peptides QGAGAAA[1- 13 C]A 8 AAGG[2- 13 C]A 13 GAGGAG[2- 1…
The synthesis of novel amphiphilic graft copolyesters based on hydrophobic poly(ε-caprolactone) (PCL) segments grafted all along a hydrophilic poly(( R, S )-β-malic acid) (PMLA) backbone is proposed. These PMLA- g -PCL graft copolymers have been prepared in a controlled way using either the “grafting through” or the “…
Minute variations in a carrier density can drive drastic qualitative changes in the ground state of a correlated electron system. To establish methods of critical control of the carrier density at the boundary of phase competitions is a pressing challenge in an interdisciplinary field of modern condensed-matter physic…
The crystal structure of Cr(2)N precipitates in high-nitrogen austenitic stainless steel was investigated by transmission electron microscopy (TEM). Based on the analyses of selected area diffraction (SAD) patterns, the crystal structure of Cr(2)N was confirmed to be trigonal (P31m) and was characterized by three sets…
The stable anhydrous form of alpha-lactose has been obtained by the dehydration of alpha-lactose monohydrate in methanol. An X-ray powder diffraction pattern was recorded at room temperature with a laboratory diffractometer equipped with an INEL curved sensitive detector CPS120. The starting structural model of this f…
We present a model for reverse domain nucleation in ferroelectrics, which takes into account ferroelectric-electrode coupling in both homogeneous and random cases. The model provides a solution to the coercivity paradox--i.e., the large discrepancy between the observed and predicted coercive fields, common to many sys…
In‐situ microfibrillar poly(ethylene terephthalate) (PET)/isotactic polypropylene (iPP) was fabricated via a slit die extrusion, hot stretching, and quenching process. Morphological observation shows that well‐defined microfibrils were generated in‐situ. The microfibrils become larger with the increase of PET concentr…
We have used electron microscopy and diffraction to refine the structure and investigate the microstructure of Ba(3)Ti(2)RuO(9). The parent compound is hexagonal BaTiO(3) with the space group P6(3)/mmc. Using convergent-beam electron diffraction (CBED) combined with electron-sensitive image plates we have found that t…
Thermal stability and temperature-dependent properties of carbon nanotubes are very important for the fabrication of carbon nanotube-based devices. High purity of carbon nanotube matrix was achieved by sieving through Anatop filters. The temperature dependence of G-band in single-wall-carbon-nanotubes matrices and hig…
The scattering structure factor of a colloidal gel in a q range of 5 orders of magnitude has been determined by combining static light scattering, small-angle light scattering, and neutron scattering measurements. It exhibits simultaneously two types of structure information: a mass fractal scaling within the clusters…
Ultrathin nanocrystalline films of gold formed at different temperatures at the organic-aqueous interface have been investigated by X-ray diffraction, electron microscopy, atomic force microscopy, and electronic spectroscopy. The films are smooth and continuous over relatively large length scales and are generally app…
This work shows that optical switching between the spiro (SP) and merocyanine (MC) states of different photochromes specifically labeled to G-actin can be used to rapidly and reversibly modulate specific dipolar interactions within the conjugate. Members of a common spirobenzopyran photochrome and a related spironapht…
ZnO films on c-sapphire with and without an MgO buffer were grown by plasma-assisted molecular beam epitaxy. ZnO with an MgO buffer was two dimensionally grown, while ZnO without an MgO buffer was grown three dimensionally, which was confirmed by in situ RHEED (reflection high energy electron diffraction) and AFM (ato…
We report on an extensive study on light propagation in Fibonacci quasicrystals, with special focus on the optical states around the fundamental band gap of the structure. The samples are fabricated using free-standing porous silicon and experiments are performed using an ultrafast time-resolved transmission technique…
The competition between ferromagnetic and antiferromagnetic exchange for Ni–Gd and Ni–Ni interactions, respectively, leads to spin frustration and a degenerate S=13/2 spin ground state for the symmetric [GdNi6] cluster in (NMe4)[GdNi6(pro)12](ClO4)4 (Hpro=proline; octahedral core shown). The influence of the Ni–Ni cou…