Materials Literature
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Tunneling contacts made of any insulating polymers, a champion technology in silicon solar cells, are shown to increase the stabilized efficiency of perovskite solar cells (PSCs) to 20.3%. The tunneling layers spatially separate photo-generated electrons and holes at the perovskite-cathode interface and reduce charge…
Perovskite solar cells (PSCs) have now achieved efficiencies in excess of 22%, but very little is known about their long-term stability under thermal stress. So far, stability reports have hinted at the importance of substituting the organic components, but little attention has been given to the metal contact. We inve…
Mixed crystals Li6YxGd1-x(BO3)3:Ce3+(LYGBO) (where, x = 0.0, 0.2, 0.5, 0.8, 1.0) are grown by using Czochralski method with different proportions of Li6Y(BO3)3and Li6Gd(BO3)3. All crystals are doped with 3 mole% optimized concentrations of Ce3+ions. The grown crystals are 20-70 mm in length and 5-10 mm in diameter. De…
The β,β-isomer of open-Wells–Dawson polyoxometalate (POM) containing a tetra-iron(III) cluster, K9[{Fe4(H2O)(OH)5}(β,β-Si2W18O66)]·17H2O (potassium salt of β,β-Fe4-open), was synthesized by reacting Na9H[A-β-SiW9O34]·23H2O with FeCl3·6H2O at pH 3, and characterized by X-ray crystallography, FTIR, elemental analysis, T…
Objectives: Exceptional reaction conditions can be generated by ultrasonic irradiation via acoustic cavitation, which allows for the synthesis of new materials with unusual properties. Inspired by the importance of this efficient and environmentally friendly synthetic route, waterborne polyurethane copolymer with pend…
In this paper, we report a raman spectroscopy and X-ray diffraction investigations on lead-free (1-x)(Na 0.5 Bi 0.5 )TiO 3 -xBaTiO 3 (NBT-BT) solid solution ceramics over a composition range of 0 x 0.10 at room temperature. The Raman curves were fitted to the individual Raman peaks. The obtained peaks were analyzed by…
Corrosion behaviour of the liquid-phase sintered SiC ceramics (LPS-SiC) was studied through exploration of weight loss, strength reduction and morphology evolution of the SiC specimens etched in the room-temperature/70°C 6.12 mol/L (20 wt-%) NaOH aqueous solutions. As a comparison, corrosion of the reaction-bonded SiC…
Hole-doping into K–TCNQ (TCNQ = 7,7,8,8-tetracyanoquinodimethane) crystals with segregated TCNQ anion radical columns with dimeric deformation (Peierls state) has been performed by a contact doping method using F 4 TCNQ (F 4 TCNQ = 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane) crystals or powder. The sheet res…
The photoinduced dynamics of a potassium-tetracyanoquinodimethane (K-TCNQ) single crystal in the generalized Peierls phase are evaluated via time-resolved vibrational spectroscopy. The transient reflectivity spectrum of the photoinduced state in the mid-IR range shows a decrease in the height and width of the reflecti…
Effect of rotor type, rotor diameter, doffing-tube nozzle, and torque-stop on polyester/cotton rotor-spun yarn hairiness have been studied. To model the hairiness of polyester/cotton blended yarn, artificial neural networks and regression models have been used. The results show that there are significant differences i…
Several kinds of polymeric particles designed for drug delivery purposes can be successfully synthesized via heterogeneous polymerization processes. Due to the high ability to produce tailor-made polymers, suspension, mass-suspension, suspension-emulsion, miniemulsion and emulsion polymerization processes deserve spec…
The growing requisite for materials having high thermo-oxidative stability makes the design and development of high performance materials an active area of research. Fluorination of the polymer backbone is a widely applied strategy to improve various properties of the polymer, most importantly the thermo-oxidative sta…
While it is often thought that the geometric phase is less sensitive to fluctuations in the control fields, a very general feature of adiabatic Hamiltonians is the unavoidable dynamic phase that accompanies the geometric phase. The effect of control field noise during adiabatic geometric quantum gate operations has no…
Defects induced graphene oxide-amine functionalized silica hybrid nanocomposite (GO-NH-(CH 2 ) 3 -SiO 2 ) has been synthesized through sonochemical route with dangling of amine functionalized silica, SiO 2 -(CH 2 ) 3 -NH 2 on GO. SiO 2 -(CH 2 ) 3 -NH 2 nanoparticles (dia ∼ 10–15 nm) have been dangled through chemical…
A novel composite oil-absorbent microsphere poly(stearyl methacrylate-co-butyl acrylate) (PSB)-SiO2 was prepared by introducing hydrophobic nano-silica Aerosil R812 into the suspension polymerization system of stearyl methacrylate and butyl acrylate and was characterized by Fourier transform infrared and scanning elec…
I use the Onsager approximation of density-functional theory with a simple Parsons–Lee re-scaling to study a hybrid-aligned liquid crystal under very strong confinement. The system is modelled as a film of hard Gaussian overlap particles in a slit geometry, where anchoring is planar at one wall and homeotropic at the…
We applied density functional theory to study octyl-D-xyloside isomers in order to explain the features responsible for the liquid crystal mesophases. Compared to a glucoside, the xylose headgroup has a proton instead of the hydroxymethyl group on C5. Thus, a xyloside has a reduced headgroup volume that renders it les…
A step towards the understanding of some mechanistic events occurring in the styrene Pickering emulsions, using a SiO2 dispersion, is presented. Polymerizations at 80°C with different levels of a water soluble initiator were performed. The emulsion polymer content was ca. 15% with conversions close to 90%. With conver…
The location and morphology of femtoliter nanodroplets that nucleate and grow on a microcap-decorated substrate in contact with a liquid phase were investigated. We experimentally examined four different wetting combinations of the flat area and the microcaps. The results show that depending on the relative wettabilit…
Stress corrosion cracking (SCC) behaviour of 316L stainless steel in CO2–H2S–Cl− environments with and without methyldiethanolamine (MDEA) was investigated by slow strain rate testing and scanning electron microscopy (SEM). The results show that elongation ratio, reduction in area ratio (RAR) and time to failure ratio…