2,859 publications from this institution
There are several benefits to using a laser, including less invasive, more accurate, and precise procedures with less discomfort, quicker healing, no direct soft and hard tissue contact, no vibration, and more patients. Attain rapid hemostasis and humidity control. Some people have anesthesia fears and allergies. Lasers have become an essential aspect of these patients' therapy. A systematic literature review from 2012 to 2022 was performed using PubMed, Medline, and ScienceDirect databases.
The present study is aimed to fabricate composite materials containing epoxy resin (EPYR) reinforced by mixed carbon-based nano-fillers in the form of graphene nano-platelet (GNP) and multi-walled carbon nanotube (MWCNT) using the dissolution casting technique with the help of ultrasonic assistance. The pure epoxy resin was reinforced by variable loading of mixed GNP/MWCNT <i>in situ</i>, and the epoxy resin is denoted as EPYR/GNP/MWCNT<sub>2-30</sub>. The numbers 2-30 corresponded to the final mass ratio of the nano-fillers. The designed products were reinforced by variable percentages of GNP/MWCNTs. XRD, FT-IR, thermal analyses, FE-SEM, TEM and electrical conductivity were utilized as identification techniques to confirm the structures of these composite materials. An excellent evidence for the composite formation was given by XRD diffraction patterns and FT-IR spectroscopy. The introduced amounts of mixed nano-fillers showed significant effects on the thermal, conducting and coating behaviors of pure EPYR. Pure EPYR and EPYR/GNP/MWCNT<sub>20,30</sub> showed higher thermal stabilities than other materials in the range of 400-410 °C. EPYR/GNP/MWCNT<sub>20</sub> also showed remarkable increase in the thermal stability compared to other materials. <i>T</i> <sub>10</sub> represents the temperatures at which 10% weight losses are examined. Pure EPYR and its related EPYR/GNP/MWCNT<sub>2-30</sub> displayed similar thermal stabilities at <i>T</i> <sub>10</sub> temperature (330 ± 4 °C). The morphological features were examined by SEM and TEM; these features showed that the nanocomposite components were extremely compatible. The <i>in situ</i> electrical conductivity values showed noticeable enhancement for the formulations of EPYR/GNP/MWCNT<sub>2-10</sub>. Moreover, the coating performance of EPYR was tested by water uptake experiments and electrochemical impedance; both tests proved that the mixed GNP/MWCNT nano-fillers remarkably improved the pure EPYR coating due to the ionic charge transfer resistance and elevated barrier behaviour. The coating resistance variations values (CRv) of EPYR/GNP/MWCNT<sub>10</sub> were the highest among the measured composition values, closely followed by those of EPYR/GNP/MWCNT<sub>20</sub> and EPYR/GNP/MWCNT<sub>30</sub>.
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.
This review illustrates the recent developments in heterogeneous catalysis using mixed metal or mixed linker MOFs.
Purpose To discover new photochromic molecules suitable for various applications. Design/methodology/approach The synthesis of the new photochromic pyrazole derivatives was accomplished by reaction of tetracyanoquinodimethane (TCNQ) and pyrazoles in polar solvents such as dimethylformamide (DMF). Findings A new photochromic system had been developed and the synthesis and photochromic properties of three pyrazole derivatives upon irradiation with ultraviolet light were studies in different solvents. The photochromic and thermochromic properties were affected markedly upon changing the solvent polarity. The new materials gave colourless to deep yellow coloration upon irradiation with ultraviolet, rendering them suitable candidates for optical storage media using the region of 400 nm. Practical implications A new photochromic system had been developed via a simple method. The new compounds showed photochromic, thermochromic, and solvatochromic properties making them potential candidates for many applications such as sensors, optical data storage, sensors and heat sensitive materials. Originality/value The photochromic system was novel and hence the photochromic molecules were novel.
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.
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 hyperpolarizabilities of five prototypical and four recently synthesized long-range charge-transfer (CT) organic compounds are calculated using short- and middle-range (SR and MR) hybrid functionals. These results are compared with data from MP2 and other DFT methods including GGAs, global hybrids, long-range corrected functionals (LC-DFT), and optimally tuned LC-DFT. Although it is commonly believed that the overestimation of hyperpolarizabilities associated with CT excitations by GGA and global hybrid functionals is the result of their wrong asymptotic exchange potential, and that LC-DFT heals this issue, we show here that SR and MR functionals yield results similar to those from LC-DFT. Hence, the long-range correction per se does not appear to be the key element in the well-known improved description of hyperpolarizabilities by LC-DFT. Rather, we argue that the inclusion of substantial amounts of Hartree-Fock exchange, which reduces the many-electron self-interaction error, is responsible for the relatively good results afforded by range separated hybrids. Additionally, we evaluate the effects of solvent and frequency on hyperpolarizabilities computed by SR and MR hybrids and compare these predictions with other DFT methods and available experimental data.
Copper oxide-cadmium oxide nanocomposites (CuO-CdO NCs) were synthesized by solvothermal technique in a basic medium. CuO-CdO NCs were characterized using conventional techniques, such as Fourier Transform Infrared Spectroscopy (FTIR), UVâVisible Spectroscopy (UV/Vis), Field-Emission Scanning Electron Microscopy (FESEM), X-ray electron dispersive spectroscopy (XEDS), X-ray photoelectron spectroscopy (XPS), and powder X-ray diffraction (XRD). A selective and enzyme-less Bilirubin (BLR) sensor was developed with a thin-layer of NCs onto a glassy carbon electrode (GCE, surface area = 0.0316 cm2) using 5% nafion binders at room conditions. Improved electrochemical performances of higher sensitivity, lower detection limit, linear dynamic range (LDR), and long-term stability of preferred BLR were achieved by a reliable current-voltage (I-V) approach. The calibration curve was found linear (R2 = 0.9347) in a wide range of BLR concentration (10.0 pM ~ 10.0 mM). Based on the signal to noise ratio value of 3, the sensitivity and limit of detection (LOD) of the sensor were calculated as 95.0 pA μMâ1 cmâ2 and 1.0 ± 0.1 pM respectively. Solvothermally synthesized CuO-CdO NCs/GCE is an excellent advancement of developing a selective and sensitive BLR sensor by electrochemical approach and practically implemented in real sample applications. Keywords: CuO-CdO nanocomposites, Bilirubin biosensor, Glassy carbon electrode, Sensitivity, Real sample analysis, Health care field
