Materials Literature
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The cold crystallization kinetics of ultrathin films of poly(3-hydroxybutyrate) (PHB) have been investigated by dielectric spectroscopy. Upon reduction of the film thickness, a lowering of the Avrami exponent accompanied by an increase of the crystallization time was observed. The experimental results are analysed in…
We review some aspects of the confusion concerning the glass transition in water, and then show that it must be of a quite different character from that in other molecular liquids, and in fact is the kinetically controlled part of a classical order–disorder transition. (This is the conclusion reached in a review of th…
The achiral sodium salt of poly(4-carboxyphenyl isocyanide) (poly-1-Na) folds into a one-handed helix induced by optically active amines in water. The induced helicity remains when the optically active amines are completely removed, and further modification of the side groups to amide residues is possible without loss…
Abstract Novel polymer nanocomposite foams made by a two step compression molding method are analyzed in this article. Nanocomposites of low density polyethylene and an organo‐modified hectorite were first melt compounded and then foamed using a compression molding method. To study the influence of the presence and th…
Dielectric, depolarized light scattering (LS) and optical Kerr effect (OKE) data are critically discussed in an attempt to achieve a common interpretation of the evolution of dynamic susceptibility in molecular glass formers at temperatures down to the glass transition T g . The so-called intermediate power-law, obser…
The influence of hydrostatic pressure on diffusion and ionic conduction is providing deeper insights into the atomistic mechanisms of ionic motion in glasses. We have studied the tracer diffusion of 22Na in a sodium borate glass and of 86Rb in a rubidium borate glass as functions of hydrostatic pressures. The activati…
In this work, we describe a self-assembly approach for generation of nanostructured Au sponges with Au nanoparticles as starting building blocks. It is found that the hydrothermal condition is essential to detach surfactants and thus trigger the self-assembly of Au nanoparticles. The resultant Au sponges are comprised…
Ab initio calculations have been performed to clarify the character of the electronic ground state of the high-temperature phase of $\mathrm{Ca}\mathrm{Fe}{\mathrm{O}}_{3}$ at different external pressures. The analysis of the correlated $N$-electron wave function of properly embedded $\mathrm{Fe}{\mathrm{O}}_{6}$ clus…
Come together: Porous CaCO3 microparticles self-assemble to form shells at the interfaces of water-in-oil emulsion droplets. Water cores containing alginate are subsequently gelated in situ by Ca2+, which is released from the CaCO3 microparticles when the pH value is lowered. As the picture shows, the CaCO3 microparti…
Abstract Regenerated silk fibroin (SF) filaments could be prepared by wet spinning in common solvent/coagulation system. SF was directly dissolved in mixture solvent of phosphoric acid and formic acid (20/80–30/70 ratio) and coagulated in methanol bath. The concentration and stability of SF dope solution have been stu…
The syntheses, crystal structures, and magnetochemical characterization of four new iron clusters [Fe7O4(O2CPh)11(dmem)2] (1), [Fe7O4(O2CMe)11(dmem)2] (2), [Fe6O2(OH)4(O2CBut)8(dmem)2] (3), and [Fe3O(O2CBut)2(N3)3(dmem)2] (4) (dmemH=Me2NCH2CH2N(Me)CH2CH2OH)=2-{[2-(dimethylamino)ethyl]methylamino}ethanol) are reported.…
Plastic tubing: The parallel alignment of single-walled carbon nanotubes (NTs) with a self-assembling biomolecular scaffold, the tobacco mosaic virus (TMV), is presented. A multifunctional polymeric surfactant brings together these two disparate components: The NTs are solubilized by a layer of poly(ethylene glycol) a…
This work focuses on a La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3- δ (LaSrCoFeO) perovskite and Fe 2 O 3 /LaSrCoFeO nanocomposite powders; the samples are characterized by means of X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), diffuse reflectance infrared Fouri…
Metalation of meso-hexakis(pentafluorophenyl)-substituted [26]hexaphyrin(1.1.1.1.1.1) (1) has been explored with group 12 metal ions Zn(II), Cd(II), and Hg(II). Zn(II) and Cd(II) ions afforded dinuclear gable-shaped complexes 2 and 3 in good yields, while Hg(II) ion provided bis-Hg(II) and mono-Hg(II) planar complexes…
The research field of the glass transition is experimentally driven. There is an abundance of experimental data and facts accumulated in the past as well as the emergence of important new results every now and then. Therefore, when judging theories and models of the glass transition, it is fair to ask the question of…
Surface coating of synthetic materials is often considered to improve biomedical devices biocompatibility. In this study, we covalently bound fibronectin (FN) onto ammonia plasma-treated PTFE via two crosslinkers, namely glutaric anhydride (GA) and sulfosuccinimidyl-4-(p-maleimidophenyl)butyrate (sulfo-SMPB). With res…
Abstract This study is about polyurea prepolymer, which was synthesized from the extender ( N ‐(2‐hydroxyethyl) ethylene diamine, HEDA or ethylene diamine, EDA) with 4,4′‐diphenylmethane diisocyanate (MDI), as an intercalative agent to intercalate the organic modified montmorillonite clay. Then, it is further reacted…
Abstract Copolymers of methyl methacrylate (MMA) with 2,3,5,6‐tetrafluorophenyl methacrylate (TFPMA), pentafluorophenyl methacrylate (PFPMA), and 4‐trifluoromethyl‐2,3,5,6‐tetrafluorophenyl methacrylate (TFMPMA) were investigated. All the three systems showed a random copolymerization character. The composition, glass…
In this paper, the paper discussed the emission of visible light by a monolithically integrated silicon diode under reverse bias. The emission of light is achieved using a special defect-engineered buried layer. The light is emitted as punctiform sources by the defects located at the p-n junction of the reverse-biased…
The subject of nephrogenic systemic fibrosis (NSF), first addressed in the radiological community in this journal a few months ago [1], is a fast-moving topic with new details arising almost every day. NSF is a rare, debilitating, and sometimes fatal condition that only occurs in patients with severe renal impairment.…