Synergistic effects on europium luminescence in aqueous media

1992 ◽  
pp. 1282 ◽  
Author(s):  
Peter G. Sammes ◽  
Gokhan Yahioglu ◽  
Graham D. Yearwood
Keyword(s):  
Synergistic Effects ◽  
Aqueous Media ◽  
Europium Luminescence

An indole-derived porous organic polymer for the efficient visual colorimetric capture of iodine in aqueous media via the synergistic effects of cation–π and electrostatic forces

2020 ◽  
Vol 56 (9) ◽  
pp. 1401-1404 ◽  
Author(s):  
Min Huang ◽  
Li Yang ◽  
Xiuyun Li ◽  
Guanjun Chang
Keyword(s):  
Electrostatic Interactions ◽  
Synergistic Effects ◽  
Aqueous Media ◽  
Organic Polymer ◽  
Electrostatic Forces ◽  
Porous Organic Polymer

A recyclable indole-based POP was successfully achieved, which was capable of visual colorimetric iodine capture in water via cation–π and electrostatic interactions.

scholarly journals Bio-assisted synthesized Ag(0) nanoparticles stabilized on hybrid of sepiolite and chitin: efficient catalytic system for xanthene synthesis

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Fatemeh Ghoreyshi Kahangi ◽  
Morteza Mehrdad ◽  
Majid M. Heravi ◽  
Samahe Sadjadi
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Specific Surface ◽  
Catalytic System ◽  
Synergistic Effects ◽  
Aqueous Media ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Mean Diameter ◽  
High Yields

Abstract In this work, with the use of two natural compounds, chitin and sepiolite clay, a novel covalent hybrid is fabricated and applied as a support for the stabilization of silver nanoparticles with the aid of Kombucha extract as a natural reducing agent. The resultant catalytic system, Ag@Sep-N–CH, was characterized via XRD, TEM, FTIR, ICP, SEM, TGA, UV–Vis and BET. It was found that fine Ag(0) nanoparticles with mean diameter of 6.1 ± 1.8 nm were formed on the support and the specific surface area of the catalyst was 130 m2 g−1. The study of the catalytic performance of Ag@Sep-N–CH for catalyzing synthesis of xanthenes in aqueous media under mild reaction condition confirmed that Ag@Sep-N–CH exhibited high catalytic activity and could promote the reaction of various substrates to furnish the corresponding products in high yields. Moreover, the contribution of both chitin and sepiolite to the catalysis has been affirmed. It was found that hybridization of these two components led to synergistic effects and consequently improved the observed catalytic activity. Notably, the catalyst was recyclable up to several reaction runs.

scholarly journals Antioxidant properties of aqueous media with molecular hydrogen used in tnviromental medicine

2019 ◽  
Vol 59 (8) ◽  
pp. 140-146
Author(s):  
Anatoly A. Lapin ◽  
◽  
Irek G. Garifullin ◽  
Valery N. Zelenkov ◽  
Sergey D. Filippov ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Molecular Hydrogen ◽  
Oral Fluid ◽  
Synergistic Effects ◽  
Aqueous Media ◽  
Antioxidant Properties ◽  
Operating Conditions ◽  
Aquatic Systems ◽  
Total Antioxidant Activity ◽  
Total Antioxidant

The article presents the results of the biotechnological study of aquatic environments with molecular hydrogen by antioxidant activity. Molecular hydrogen has selective antioxidant activity against dangerous free radicals. It has anti-inflammatory, anti-apoptotic, anti-allergic effects and stimulates energy metabolism. The problem is urgent nowadays because of the great interest to molecular hydrogen as an antioxidant over the past ten years, but its quantitative metabolic parameters have not been estimated yet. The total antioxidant activity of aquatic systems saturated by hydrogen have been studied using coulometric analysis. It was shown that their antioxidant activity of aquatic systems increase of 8-10 times depending on the operating conditions and time of the "H2 Inhaler" device and 3 times when using a mineral generator active Hydrogen "Aquaspectr Mineral". The effect of molecular hydrogen have been studied by changing the antioxidant status of the human body, which was determined by changing the total antioxidant activity of urine and oral fluid during inhalation of hydrogen and oral administration of hydrogen-saturated water. The synergistic effects has been revealed in determining the total antioxidant activity of the oral fluid in the range from 14.02 to 17.59% rel. and synergism/antagonism of urine in the range from 37.17 to 27.62% rel., compared with control measurements. The total antioxidant activity was determined using electro-generated bromine, the samples were analyzed on an Expert-006 coulometer (Econix-Expert LLC, Russia) according to our certified method.

Morphology of High-Performance Rigid-Rod Polymer Fibers and Molecular Composites

1989 ◽  
Vol 47 ◽  
pp. 338-339
Author(s):  
W.W. Adams ◽  
S. J. Krause
Keyword(s):  
Tensile Strength ◽  
High Performance ◽  
Liquid Crystalline ◽  
Molecular Level ◽  
Synergistic Effects ◽  
Tensile Modulus ◽  
Commercial Development ◽  
The Matrix ◽  
Molecular Composites ◽  
Rigid Rod

Rigid-rod polymers such as PBO, poly(paraphenylene benzobisoxazole), Figure 1a, are now in commercial development for use as high-performance fibers and for reinforcement at the molecular level in molecular composites. Spinning of liquid crystalline polyphosphoric acid solutions of PBO, followed by washing, drying, and tension heat treatment produces fibers which have the following properties: density of 1.59 g/cm3; tensile strength of 820 kpsi; tensile modulus of 52 Mpsi; compressive strength of 50 kpsi; they are electrically insulating; they do not absorb moisture; and they are insensitive to radiation, including ultraviolet. Since the chain modulus of PBO is estimated to be 730 GPa, the high stiffness also affords the opportunity to reinforce a flexible coil polymer at the molecular level, in analogy to a chopped fiber reinforced composite. The objectives of the molecular composite concept are to eliminate the thermal expansion coefficient mismatch between the fiber and the matrix, as occurs in conventional composites, to eliminate the interface between the fiber and the matrix, and, hopefully, to obtain synergistic effects from the exceptional stiffness of the rigid-rod molecule. These expectations have been confirmed in the case of blending rigid-rod PBZT, poly(paraphenylene benzobisthiazole), Figure 1b, with stiff-chain ABPBI, poly 2,5(6) benzimidazole, Fig. 1c A film with 30% PBZT/70% ABPBI had tensile strength 190 kpsi and tensile modulus of 13 Mpsi when solution spun from a 3% methane sulfonic acid solution into a film. The modulus, as predicted by rule of mixtures, for a film with this composition and with planar isotropic orientation, should be 16 Mpsi. The experimental value is 80% of the theoretical value indicating that the concept of a molecular composite is valid.

Highly efficient and selective photocatalytic CO2 to CO conversion in aqueous solution

2020 ◽  
Vol 56 (27) ◽  
pp. 3851-3854 ◽  
Author(s):  
Xiaomin Chai ◽  
Hai-Hua Huang ◽  
Huiping Liu ◽  
Zhuofeng Ke ◽  
Wen-Wen Yong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Performance ◽  
Aqueous Media ◽  
Highly Efficient ◽  
Co Conversion

A Co-based complex displayed the highest photocatalytic performance for CO2 to CO conversion in aqueous media.

A new model of synergistic effects of alcohol and high-fat diet on hepatic injury

2010 ◽  
Vol 48 (01) ◽  
Author(s):  
E Gäbele ◽  
K Dostert ◽  
C Dorn ◽  
C Hellerbrand
Keyword(s):  
High Fat Diet ◽  
Hepatic Injury ◽  
Synergistic Effects ◽  
High Fat ◽  
New Model
Sign in / Sign up

Export Citation Format

Share Document