Materials Literature
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Nanoporous metals have many technologically promising applications, but their tendency to coarsen limits their long-term stability and excludes high temperature applications. Here, we demonstrate that atomic layer deposition (ALD) can be used to stabilize and functionalize nanoporous metals. Specifically, we studied t…
Five novel near-infrared BODIPY dyes were prepared for improved singlet oxygen generation using thiophene and bromine. Theoretical, optical, photostable, and singlet oxygen generation characteristics of these dyes were assessed. Predicted excitation energies by TDDFT calculations were in good agreement (ΔE ≈ 0.06 eV)…
Site-selective spectroscopy in hexagonal β-NaYF 4:Er 3+,Yb 3+ has revealed different environments for Er 3+ ions (multisite formation). The low-temperature 4 S 3/2 → 4 I 15/2 Er 3+ green emission depends on the excitation wavelength associated with the 4 F 7/2 Er 3+ level. We have studied the effect of hydrostatic pre…
A facile biomimetic method was developed to enhance the interfacial interaction in polymer-layered silicate nanocomposites. By mimicking mussel adhesive proteins, a monolayer of polydopamine was constructed on clay surface by a controllable coating method. The modified clay (D-clay) was incorporated into an epoxy resi…
Interfaces play a key role in low dimensional materials like graphene or its boron nitrogen analog, white graphene. The edge energy of hexagonal boron nitride (h-BN) has not been determined as its lower symmetry makes it difficult to separate the opposite B-rich and N-rich zigzag sides. We report unambiguous energy va…
We have investigated the electronic structures of single- and double-layered MoS${}_{2}$, composing of heterojunction structures such as graphene, MoS${}_{2}$, and SiO${}_{2}$ and MoS${}_{2}$ and SiO${}_{2}$, using scanning photoelectron microscopy. Negative shifts of both core levels and valence bands toward the Ferm…
The calculation of core losses in inductive components is difficult and has not yet been entirely solved. In particular, it is impossible to predict the influence of a dc premagnetization on the losses without extensive measurements. For this paper, different materials have been tested to gain information on how core…
Stimuli-responsive capsules are of interest in drug delivery, fragrance release, food preservation, and self-healing materials. Many methods are used to trigger the release of encapsulated contents. Here we highlight mechanisms for the controlled release of encapsulated cargo that utilize chemical reactions occurring…
Highly stable porous polymer networks (PPNs) are synthesized through Yamamoto homocoupling reaction between tetrahedral monomers. Among those polymers, PPN-4 shows exceptionally high Langmuir surface area of 10063 m2 g−1 (SABET: 6461 m2 g−1). It also exhibits ultra-high hydrogen (158 mg g−1), methane (389 mg g−1), and…
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Temperature-driven metal-insulator and pressure-driven insulator-metal transitions observed in $(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}){}_{8}[{\mathrm{Hg}}_{4}{X}_{12}({\mathrm{C}}_{6}{\mathrm{H}}_{5}Y){}_{2}]$ with $X=Y=\mathrm{Br}$ are studied through band-structure calculations based on x-ray crystal-structure de…
In this study, high-melt-strength polypropylenes (PPs) were prepared by reactive extrusion of PP and varied amount of divinylbenzene in the presence of dicumyl peroxide and an antioxidant, and the dynamic rheological behavior, crystalline morphology, and fracture behavior of the resultant materials were investigated.…
Staff occupational exposure for (18)F-FDG studies has been assessed. For this purpose, different detectors, all traceable to PTB standards, have been used. Measurements were carried out in different working areas in the facility for different procedures and 400 MBq per patient standard injected activity. A radiologica…
Composites comprised of chitosan (CS) and multiwalled carbon nanotubes (MWCNTs) were fabricated by milling and ultrasonication dispersion methods. Scanning electron microscopy images showed homogeneous dispersion of MWCNTs throughout the CS matrix for samples prepared by either ultrasonication or milling methods. Furt…
The form of ethylene–propylene–rubber DC feeder cable faults can be attributed to insulation aging and mechanical insulation crack, while integrating the DC leakage current (DLC) signal, and track discharge (TD) signal could effectively detect such defaults online. Further research results about an online monitoring s…
Solid-state electrochemistry of a tetracyanoquinodimethane (TCNQ)-modified electrode in contact with a tetrapropylammonium cation (Pr(4)N(+)) electrolyte showed two electron-transfer steps to give Pr(4)N(TCNQ)(2) (1) and Pr(4)N(TCNQ) (2) rather than the traditional one-electron step to directly give Pr(4)N(TCNQ). Two…
Abstract In this study, Mg(OH) 2 (MH) was first modified by 1‐ n ‐tetradecyl‐3‐carboxymethyl imidazolium chloride ([C 14 cim]Cl), an imidazolium ionic liquid, and then the modified MH ([C 14 cim]Cl‐MH) was incorporated into linear low‐density polyethylene (LLDPE) by melt‐mixing to obtain the LLDPE/[C 14 cim]Cl‐MH comp…
Abstract In this study, we report the application of synchrotron radiation nanoprobe technique to the elemental analysis of single as‐grown and Co‐implanted ZnO nanowires. The nano‐X‐ray fluorescence technique enabled us not only to examine the spatial variation of Zn and Co elements, but also to disregard the presenc…
Alanes are critical intermediates in hydrogen storage reactions for mass transport during the formation of complex metal hydrides. Titanium has been shown to promote hydrogen desorption and hydrogenation, but its role as a catalyst is not clear. Combining surface infrared (IR) spectroscopy and density functional theor…
High-resolution Brillouin scattering experiments are performed under hydrostatic pressures ranging from 0 to 10 GPa in vitreous silica. The hypersound-attenuation coefficient exhibits a sharp maximum located at 2 GPa, which appears to coincide with the well-known minimum in sound velocity. Two main processes contribut…