NOPR Collection:

Guests mediated supramolecule-modified gold nanoparticles network for mimic enzyme application

2020-10-01T00:00:00Z

Title: Guests mediated supramolecule-modified gold nanoparticles network for mimic enzyme application Authors: Zhao, Jialin; Niu, Zhijuan; Huang, Xing; Hu, Xiaojun; Gao, Shouwei; Koh, Kwangnak; Chen, Hongxia Abstract: Supramolecules mediated porous metal nanostructures are meaningful materials because of their specific properties and wide range of applications. Here, we describe a general and simple strategy for building Au-networks based on the guest-induced 3D assembly of Au nanoparticles (Au-NPs) resulted in host-guest interaction resolved sulfonatocalix[4]arene (pSC₄)-modified Au-NPs aggregate. The diverse guest molecules induced different porous network structures resulting in their different oxidize ability toward glucose. Among three different kinds of guest, hexamethylenediamine-pSC₄-Au-NPs have high sensitivity, wide linear range and good stability. By surface characterization and calculating the electrochemical properties of the Au-NPs networks modified glassy carbon electrodes, the giving Au-NPs network reveals good porosity, high surface areas and increased conductance and electron transfer for the electrocatalysis. The synthesized nano-structures afford fast transport of glucose and ensure contact with a larger reaction surface due to high surface area. The fabricated sensor provides a platform for developing a more stable and efficient glucose sensor based on supramolecules mediated Au-NPs networks. Page(s): 1434-1441

Loess particles loaded petaloid Bi2S3 nanowires for highly efficient photodegradation of dyesunder sunlight

2020-10-01T00:00:00Z

Title: Loess particles loaded petaloid Bi2S3 nanowires for highly efficient photodegradation of dyesunder sunlight Authors: Yan, Haiyan; Wang, Qianqian; He, Yufeng; Shen, Ya; Song, Pengfei; Wang, Rongmin Abstract: In this paper, using loess particles (LoP), a kind of extremely common and inexpensive natural silicate particles with metastable structure, as inorganic carrier, the petaloid Bi₂S₃nanowires have been loaded by in-situ depositing, which afforded loess particles loaded petaloid Bi₂S₃nanowires (PBiNw@LoP) with one-step hydrothermal procedure. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and adsorption-desorption isotherms of N₂ have been employed to characterize the prepared composite photocatalyst. The results show that the petaloid Bi₂S₃nanowires are evenly dispersed on the loose surface of loess particles. The photocatalytic activity of PBiNw@LoP is evaluated by photodegradation of methylene blue (MB) irradiated with sunlight. It is demonstrated that PBiNw@LoP exhibits the superior photocatalytic performance with the photocatalytic degradation rate of 99.5%. The petaloid Bi₂S₃nanowires with larger specific surface helps to absorb light, while the loose surface of loess with certain adsorption capacity. Therefore, the photocatalytic activity has been improved by the synergistic effect in photodegradation of dyes, while the ratio of Bi₂S₃ in catalyst is decreased without affecting the photodegradation performance. In conclusion, a cheap and efficient photocatalyst has been successfully prepared for the degradation of dye wastewater. Page(s): 1442-1448

Crystal structure, Hirshfeld surface analysis, DFT and TD-DFT studies of nickel(II) monohydrate complex coordinated by bis (5-bromo-1-formylphenolate) moiety and two water molecules

2020-10-01T00:00:00Z

Title: Crystal structure, Hirshfeld surface analysis, DFT and TD-DFT studies of nickel(II) monohydrate complex coordinated by bis (5-bromo-1-formylphenolate) moiety and two water molecules Authors: Rama, I; Subashini, A; Selvameena, R Abstract: In the title compound [Ni(C₇H₅O₂Br)₂(H₂O)₂]H₂O, the Ni atom adopts distorted octahedral geometry in which the bidentate ligand acts as O,O’ donor defining an equatorial plane and water molecules occupy the axial positions. It is a mononuclear compound. This compound is crystallized on the monoclinic system, space group P2₁/c with the unit cell parameters a = 18.4561(8) Å, b = 7.3442(4) Å, c = 14.5786(8)Å, α= 90°, β= 109.057°, γ = 90° and Z = 4. The two hydroxyl groups are deprotonated and oxygen anions get coordinated with nickel. The supramolecularself-assembly of the complex is also stabilized by weak non-covalent interactions in the crystal packing, which is further quantified by using Hirshfeld surface analysis. The molecular architecture of the complex is examined by quantum chemical calculations using DFT and is compared with crystalline structure of the same. The electronic excitation energies of the complex have been simulated at TD-DFT level and are evaluated with experimental electronic spectrum. Page(s): 1449-1456

Experimental and theoretical studies of transport and optical properties of binary mixtures of acetonitrile with some alkyl methacrylates at temperatures from 298.15 to 318.15 K

2020-10-01T00:00:00Z

Title: Experimental and theoretical studies of transport and optical properties of binary mixtures of acetonitrile with some alkyl methacrylates at temperatures from 298.15 to 318.15 K Authors: Droliya, P; Chand, D; Nain, A K Abstract: The viscosities, η and refractive indices, n_D of pure acetonitrile, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate and of their binary mixtures with acetonitrile as the common component, covering the entire composition range has been measured at temperatures (298.15, 303.15, 308.15, 313.15 and 318.15) K and atmospheric pressure. Using these experimental data, the deviations in viscosity ∆η, deviations in refractive index, ∆n_D, deviations in molar refraction, ∆R_Mhave been calculated. These excess properties are correlated by the Redlich-Kister polynomial equation. The variations of ∆η, ∆n_D, ∆R_M and with composition and temperature has been discussed in terms of intermolecular interactions existing in these mixtures. Further, the viscosities and refractive indices of these binary mixtures have been calculated theoretically by using various empirical and semi-empirical relations and the results are compared with the experimental findings. Page(s): 1457-1469