Publications

In the title compound, C(9)H(7)N(3)O(3)S, the nitro and thia-zolidinone moieties are inclined with respect to the aromatic ring at dihedral angles of 9.57 (16) and 78.42 (4)°, respectively. In the crystal, N-H⋯O hydrogen bonding connects the mol-ecules along the c and a axes to form a two-dimensional polymeric network. A weak S⋯O inter-action [3.2443 (11) Å] and phenyl ring to phenyl ring off-set π⋯π stacking [with centroid-centroid separation of 3.6890 (7) Å and ring slippage of 1.479 Å] link the polymeric chains along the b and a axes, respectively.

This study presents the fabrication and investigation of rubber-carbon nanotubes-orange dye (rubber-CNTs-OD) nanocomposite based resistive and impedimetric sensors. These shockproof multifunctional sensors may be used for displacement, pressure, force, humidity and temperature sensing. Rubbing-in technology was used to fabricate the coplanar sensors on rubber substrates of dimensions 12x5x5 mm3. In the middle of the substrates, the OD-CNTs mixture (1:1 wt.%) was rubbed-in to make 3 mm wide and 12-18 μm deep active layer. On both sides of the active layer the rubber-CNTs layers were formed, that act as conductive electrodes. The length, width and the thickness of the electrodes were 4-5 mm, 5 mm and 12-18 μm, respectively. The resistance and the impedance of the sensors decreased under the effect of compressive displacement, pressure, humidity and temperature. These reductions were -43 Ω/μm to -73 Ω/μm, -3950 Ω-cm2/kgf to -6008 Ω-cm2/kgf, -187 Ω/%RH to -981 Ω/%RH and -216 Ω/°C to -270 Ω/°C, respectively. The force (in perpendicular direction to the length) causes to increase the resistance and impedance (60 Ω/gf to 300 Ω/gf). The probable reasons of the observed changes in the resistance and impedance of the sensor have been described.

A simple, economically viable and fast method has been utilized for the preparation of highly active metal nanoparticles (MNPs) in coating layer of chitosan (CH) over cellulose microfibers of cotton cloth (CC). 2 wt% of CH solution was used for the coating of CC strips (CC-CH), and were kept in aqueous solutions of metal salts to adsorb metal ions. The CC-CH templated with metal ions were then treated with aqueous solution of NaBH₄ to reduce the metal ions into zero-valent metal nanoparticles (M⁰). The CC-CH strips loaded with M⁰ were characterized by XRD, XPS, ATR-FTIR, FE-SEM and TGA, which indicates the successful synthesis of MNPs by this method. The M⁰/CC-CH strips were used as an efficient catalyst for the model reduction reaction of nitrophenol and toxic organic dyes. Among all the prepaped samples, Fe/CC-CH showed good catalytic activity for 4-NP and Rh-B dye reduction in the presence of NaBH₄ with rate constants of 0.2937 min^-1 and 0.3804 min^-1, respectively. Moreover Fe/CC-CH has good catalytic reduction ability for MO and MB having rate constants equal to 0.1698 and 0.2802 min^-1, respectively. Beside the good catalytic ability, it could be easily recoverable as compared to other available techniques. The recovery was completed by simply pulling the strip from the reaction matrix after completion of the reaction and can be used several times.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

The effect of various media (aqueous, NaCl, urea (U) and thiourea (TU)) on the micellization and adsorption activity of varied mixtures of imipramine hydrochloride (IMP) and benzethonium chloride (BZCl) is investigated via tensiometry. In an aqueous medium, the interactions between IMP and BZCl are also evaluated using UV-visible and FTIR spectroscopy. The interaction between components increases with increased mole fraction (<i>α</i> ₁) of BZCl in the mixed system (IMP + BZCl). Different parameters, such as micellar and the mixed monolayer component composition, the interaction parameters of the solution and the interface, the activity coefficients of the components in solution and at the interface, and thermodynamic parameters, are computed using different proposed theoretical models (i.e. Clint, Motomura, Rubingh and Rosen). The <i>cmc</i> values obtained for the pure components and mixtures (IMP + BZCl) of all the compositions are found to be less in NaCl than in the aqueous solution while found more in the presence of U or TU. TU is more effective in increasing the <i>cmc</i> of the pure and mixed systems than U. The Gibbs free energy <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mo>(</mml:mo> <mml:mi>Δ</mml:mi></mml:mrow> <mml:msubsup><mml:mi>G</mml:mi> <mml:mrow><mml:mrow><mml:mi>mic</mml:mi></mml:mrow> </mml:mrow> <mml:mo>∘</mml:mo></mml:msubsup> <mml:mo>)</mml:mo></mml:math> values of the studied pure and mixed systems are negative, showing the spontaneous nature of the reaction.

A monolayer anthracene-like nanostructure was investigated through Monte Carlo simulations to determine its compensation temperature and magnetic hysteresis cycle. Also, the effects of exchange coupling on compensation and transition temperatures were discussed. Additionally, the magnetic hysteresis cycles and magnetic coercive field as well as the surface of multi-loop hysteresis were studied with respect to strong exchange coupling and temperature parameters. This study discusses the behavior of multi-loop hysteresis in multi-state memories and nanotechnology.

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

The wet-chemical method was used to prepare the various ZnO–CNT, ZnO–CB, ZnO–GO nanocomposites, and ZnO nanoparticles in higher pH medium, which were finally utilized with 5% nafion to produce a thin film of NCs/Nafion/GCE sensor that has a faster response towards selected xanthine with higher sensitivity, lower detection limit, and large linear dynamic range by electrochemical approach.

Industrial NH3 synthesis mainly relies on the carbon-emitting Haber-Bosch process operating under severe conditions. Electrocatalytic N2-to-NH3 fixation under ambient conditions is an attractive approach to reduce energy consumption and avoid direct carbon emission. In this communication, sulfur-doped graphene (S-G) is proposed as an efficient and stable electrocatalyst to drive the nitrogen reduction reaction (NRR) under ambient conditions. In 0.1 M HCl, this S-G attains a remarkably large NH3 yield of 27.3 μg h-1 mgcat.-1 and a high Faradaic efficiency of 11.5% at -0.6 and -0.5 V vs. a reversible hydrogen electrode, respectively, much higher than those of undoped G (6.25 μg h-1 mgcat.-1; 0.52%). Density functional theory calculations reveal that carbon atoms close to substituted sulfur atoms are the underlying catalytic active sites for the NRR on S-G, and the related NRR mechanism is also explored.