Subspectral Editing with a Multiple Quantum Trap of IS n

Product operator theory was often used to describe analytically multipulse NMR experiments for weakly coupled spin systems. In this study first we introduce the descriptions of subspectral editing with a multiple quantum trap NMR spectra for IS$\text{}_{n}$ I=1 /2, S=5/2 with n=1, 2, 3) spin systems by using product operator formalism. These theoretical investigations lead us to form the general expressions for the intensities of the spin -1/2 nuclei coupled to the nuclei with spin ≥5/2. The obtained results can be used for the spectral editing in both liquid-state and solid-state NMR experiments. Furthermore, in order to satisfy the obtained analytical expressions for signal intensities we add the presentation of analytically description of subspectral editing with a multiple quantum trap sequence for weakly coupled IS (I=1/2, S=7/2) spin system

Subspectral Editing with a Multiple Quantum Trap of ISn\text{}_{n} Spin Systems by Using Product Operator Theory

Product operator theory was often used to describe analytically multipulse NMR experiments for weakly coupled spin systems. In this study first we introduce the descriptions of subspectral editing with a multiple quantum trap NMR spectra for IS$\text{}_{n}$ I=1 /2, S=5/2 with n=1, 2, 3) spin systems by using product operator formalism. These theoretical investigations lead us to form the general expressions for the intensities of the spin -1/2 nuclei coupled to the nuclei with spin ≥5/2. The obtained results can be used for the spectral editing in both liquid-state and solid-state NMR experiments. Furthermore, in order to satisfy the obtained analytical expressions for signal intensities we add the presentation of analytically description of subspectral editing with a multiple quantum trap sequence for weakly coupled IS (I=1/2, S=7/2) spin system

A Theoretical Investigation of Distortionless Enhancement by Polarization Transfer and Subspectral Editing with a Multiple Quantum Trap NMR Spectroscopy for CX n

Product operator theory is widely used for analytical description of multiple pulse nuclear magnetic resonance experiments for weakly coupled spin systems. Distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap NMR experiments are used for spectral assignments of $\text{}^{13}$C NMR spectra in CH$\text{}_{n}$ groups. First, in this study we proposed and showed theoretically that distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap experiments can also be used for subspectral editing of $\text{}^{13}$C NMR spectra when $\text{}^{13}$C nuclei coupled to spin-3/2 nuclei. The product operator technique is applied for the analytical description of $\text{}^{13}$C distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap NMR spectroscopy for $\text{}^{13}$CX$\text{}_{n}$ ($I_{X}$=3/2; n=1, 2, 3) groups

A Theoretical Investigation of Distortionless Enhancement by Polarization Transfer and Subspectral Editing with a Multiple Quantum Trap NMR Spectroscopy for CXn\text{}_{n} Groups

Product operator theory is widely used for analytical description of multiple pulse nuclear magnetic resonance experiments for weakly coupled spin systems. Distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap NMR experiments are used for spectral assignments of $\text{}^{13}$C NMR spectra in CH$\text{}_{n}$ groups. First, in this study we proposed and showed theoretically that distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap experiments can also be used for subspectral editing of $\text{}^{13}$C NMR spectra when $\text{}^{13}$C nuclei coupled to spin-3/2 nuclei. The product operator technique is applied for the analytical description of $\text{}^{13}$C distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap NMR spectroscopy for $\text{}^{13}$CX$\text{}_{n}$ ($I_{X}$=3/2; n=1, 2, 3) groups

Preparation of N-doped graphene powders by cyclic voltammetry and a potential application of them: Anode materials of Li-ion batteries

Nowadays, doped graphenes are attracting much interest in the field of Li-ion batteries since it shows higher specific capacity than widely used graphite. However, synthesis methods of doped graphenes have secondary processes that requires much energy. In this study, in situ synthesis of N-doped graphene powders by using of cyclic voltammetric method from starting a graphite rod in nitric acid solution has been discussed for the first time in the literature. The N-including functional groups such as nitro groups, pyrrolic N, and pyridinic N have been selectively prepared as changing scanned potential ranges in cyclic voltammetry. The electrochemical performance as anode material in Li-ion batteries has also been covered within this study. N-doped graphene powders have been characterized by electrochemical, spectroscopic, and microscopic methods. According to the X-ray photoelectron spectroscopy and Raman results, N-doped graphene powders have approximately 16 to 18 graphene rings in their main structure. The electrochemical analysis of graphene powders synthesized at different potential ranges showed that the highest capacity was obtained 438 mAh/g after 10 cycles by using current density of 50 mA/g at N-GP4. Furthermore, the sample having higher defect size shows better specific capacity. However, the more stable structure due to oxygen content and less defect size improves the rate capabilities, and thus, the results obtained at high current density indicated that the remaining capacity of N-GP1 was higher than the others. © 2019 John Wiley ; Sons, Ltd