Materials Literature
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Atomic impurities are critical for many technologies. They are used to engineer the optical and electronic properties of semiconductors for applications such as transistors, solar cells, light-emitting diodes (LEDs), and lasers, as well as to store energy for applications such as batteries and electrochemical cells. W…
In this paper, noncovalent functionalized graphene nanosheets are prepared through solvent-exfoliation expanded graphite with the aid of supercritical (SC) CO 2 and 1-pyrenamine (PA). Then, it is used as supporting materials for platinum to investigate the potential application of the obtained nanocomposite in direct…
A hybrid micro/meso forming assisted by high-frequency vibration was experimentally investigated by upsetting aluminum. Experiments with various vibration amplitudes and durations were conducted. The high-frequency vibration resulted in both acoustic softening and hardening behavior. Results showed that the overall fo…
Computational modeling and visualization studies were performed using computerized advanced programs. The theoretical investigations was succeeded to design Graphene-Graphite mixtures nano-surface catalyst to apply as nano-molecular sieving materials.The synthesized molecular sieving was carefully characterized by bot…
Abstract We report the advantages of the adsorption and electrooxidation of oligonucleotides and calf‐thymus double stranded DNA (dsDNA) at glassy carbon electrodes (GCE) modified with a dispersion of multiwalled carbon nanotubes (MWCNT) in poly‐L‐lysine (Plys) (GCE/MWCNT‐Plys). Important enhancement in the guanine ox…
With the aim to gain a wider understanding on the design rules of bioinspired adhesives for application in the medical field, the adhesion of fibrillar structures on soft and stiff polymers was determined in bench top studies on surfaces with variable roughness and in ex-vivo wet tissue tests. The adhesion strength of…
New Pd(Pt) catalysts have been fabricated by assembling multicomponents of Fe3O4 and CeO2/Pd(Pt) on the surface of reduced graphene oxide (RGO) nanosheets in layers. The as-obtained Pd(Pt) catalysts exhibit extremely high catalytic activity in the selective hydrogenation reaction of nitrobenzene. Owing to the presence…
Abstract Der Stand der Technik bei der Herstellung von Poly(propylencarbonat) ausgehend von Propylenoxid und Kohlenstoffdioxid wird vorgestellt. Thermodynamisch betrachtet ist Poly(propylencarbonat) ein kinetisches Produkt mit einer hohen Bildungsenthalpie. Nach jahrzehntelangen Entwicklungen sind einige vielversprech…
Abstract Raman spectra of rare earth (REE: rare earth elements) trichloride (REE = Y, La, Ce, Pr, Sm, Gd, Dy, or Yb) dissolved in alkali chloride eutectic melts (LiCl‐KCl, LiCl‐RbCl, and LiCl‐CsCl) were measured at 793 K. The spectra showed polarized peaks centered around 240–270 cm–1, which were identified as the tot…
Poly(m‐phenylenediamine)/ZnO (PMPD/ZnO) composites were successfully synthesized by chemical oxidative polymerization method. Powder X‐ray diffraction (XRD), Fourier‐transform infrared spectra (FTIR), transmission electron microscope, and UV–vis spectra (UV–vis) were used to characterize the prepared PMPD/ZnO composit…
Recent advances in developing donor–acceptor conjugated copolymers have led to great performance improvement in both organic photovoltaic cells and field-effect transistors. In contrast to the extensive spectroscopic studies on the photoinduced charge transfer and separation processes in these copolymers, little has b…
A synthetic strategy to prepare 2,7- or 4,9-functionalized cyclopenta[hi]aceanthrylenes that are capable of Suzuki cross-coupling reactions is demonstrated. This method has been utilized to create a series of thiophene derivatized compounds that were subsequently used to investigate the role of substitution pattern on…
This paper reports the preparation of a nano-Co(II)-catalyst (NCC) by anchoring of Co ions on immobilized bipyridylketone over the nano-sized SiO 2 /Al 2 O 3 mixed oxides. The nano-Co(II)-catalyst has been characterized by elemental analysis, BET, FT-IR, DR UV–vis and SEM. The catalytic activity of the catalyst toward…
Four novel coordination polymers based on asymmetric triangular 5-(4′-carboxylphenyl) nicotinic acid (H 2 cpna), namely, Ni(cpna)(H 2 O) 2 ( 1 ), M 2 (cpna) 2 (H 2 O) 3 ·0.5H 2 O·DMF [M = Ni for ( 2 ), Co for ( 3 )] and Ni 3 (Hcpna) 2 (cpna) 2 (H 2 O) 4 ·2H 2 O ( 4 ), have been synthesized under solvothermal condition…
Nitrogen-doped TiO2 nanofibres of anatase and TiO2(B) phases were synthesised by a reaction between titanate nanofibres of a layered structure and gaseous NH3 at 400-700 °C, following a different mechanism than that for the direct nitrogen doping from TiO2. The surface of the N-doped TiO2 nanofibres can be tuned by fa…
The emergent gauge field characteristic of the Coulomb phase of spin ice betrays its existence via pinch points in the spin structure factor S in reciprocal space which takes the form of a transverse projector P at low temperature: S(q) ~ P ~ q perpendicular(2)/q(2). We develop a theory which establishes the fate of t…
The enthalpy and sticking probability for the dissociative adsorption of methyl iodide were measured on Pt(111) at 320 K and at low coverages (up to 0.04 ML, where 1 ML is equal to one adsorbate molecule for every surface Pt atom) using single crystal adsorption calorimetry (SCAC). At this temperature and in this cove…
Solvothermal reactions of Cd(NO 3 ) 2 ·4H 2 O with aromatic polycarboxylic acids in the presence of sodium nitrate led to two acentric three-dimensional (3D) heterometallic inorganic–organic hybrid frameworks, namely, [Me 2 NH 2 ][Cd 2 Na 3 (2,4-PYDC) 4 ]·2H 2 O ( 1 ) and [Me 2 NH 2 ] [CdNa(OH- m -BDC) 2 (H 2 O) 2 ]·2…
Amphiphilic diblock copolymers composed of a thermo-responsive poly(2-isopropyl-2-oxazoline) (PIPOZ) block ( M n = 7000 g/mol) linked to a poly(3-acrylamidopropyl)trimethylammonium chloride) (PAMPTMA) block ( M n = 3500 or 8200 g/mol) were prepared by cationic ring-opening polymerization (PIPOZ block) and subsequent a…
In the evolution toward a “carbon-neutral” energy economy, among the most promising solutions for replacing today’s greenhouse gas (GHG)-emitting vehicles is the use of hydrogen as an energy carrier. In the pathway toward a future infrastructure based on renewable energy sources, a medium-term step would rely on the u…