scholarly journals Theoretical aspects of dipolar interactions and their appearance in first-order reversal curves of thermally activated single-domain particles

2006 ◽  
Vol 111 (B12) ◽  
pp. n/a-n/a ◽  
Author(s):  
R. Egli
Keyword(s):  
Single Domain ◽  
Dipolar Interactions ◽  
First Order ◽  
Thermally Activated

scholarly journals Oxidative Degradation of Amoxicillin in Aqueous Solution by Thermally Activated Persulfate

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Juanjuan Zhao ◽  
Yujiao Sun ◽  
Fachao Wu ◽  
Minjian Shi ◽  
Xurui Liu
Keyword(s):  
Aqueous Solution ◽  
Reaction Temperature ◽  
Oxidative Degradation ◽  
Water Remediation ◽  
Order Kinetic ◽  
Production Chain ◽  
First Order ◽  
Thermally Activated ◽  
Pseudo First Order ◽  
Activated Persulfate

Antibiotic residues and antibiotic resistance genes (ARGs) pose a great threat to public health and food security via the horizontal transfer in the food production chain. Oxidative degradation of amoxicillin (AMO) in aqueous solution by thermally activated persulfate (TAP) was investigated. The AMO degradation followed a pseudo-first-order kinetic model at all tested conditions. The pseudo-first-order rate constants of AMO degradation well-fitted the Arrhenius equation when the reaction temperature ranged from 35°C to 60°C, with the apparent activate energy of 126.9 kJ·mol−1. High reaction temperature, high initial persulfate concentration, low pH, high Cl− concentration, and humic acid (HA) concentration increased the AMO degradation efficiency. The EPR test demonstrated that both ·OH and SO4·− were generated in the TAP system, and the radical scavenging test identified that the predominant reactive radical species were SO4·− in aqueous solution without adjusting the solution pH. In groundwater and drinking water, AMO degradation suggested that TAP could be a reliable technology for water remediation contaminated by AMO in practice.

Oxidative Degradation and Kinetics of Trichloroethylene by Thermally Activated Persulfate

2014 ◽  
Vol 675-677 ◽  
pp. 547-550
Author(s):  
Jun Jie Yue ◽  
Xiao Qiao Zhu ◽  
Yu Ting Wang ◽  
Yu Qin Zhang ◽  
Li Zhao ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Chemical Oxidation ◽  
Molar Ratio ◽  
Pseudo First Order Reaction ◽  
In Situ Chemical Oxidation ◽  
First Order ◽  
Molar Ratios ◽  
Thermally Activated ◽  
Kinetics Of

In situ chemical oxidation with persulfate (PS) anion (S2O82-) is a viable technique for remediation of groundwater contaminants such as trichloroethylene (TCE). This laboratory study investigated the use of the oxidant sodium PS for the chemical oxidation of TCE at different conditions to determine the influence of temperature, pH, and the PS/TCE molar ratio. Experiments revealed that higher temperatures, lower pH, and higher PS/TCE molar ratios were to the benefit of TCE oxidation by PS. By investigating the reaction kinetics, the degradations of contaminant can be described by use of pseudo-first-order reaction. At the temperatures ranging from 25°C to 40°C, the activation energy for the degradation of TCE was determined to be 85.04 KJ/mol.

scholarly journals Photoproducts Formation from Salicylic Acid and Poly(allylamine hydrochloride) in Aqueous Solution Induced by UV-B Radiation

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Romario J. da Silva ◽  
Nara C. de Souza ◽  
Josmary R. Silva
Keyword(s):  
Aqueous Solution ◽  
Salicylic Acid ◽  
Irradiation Time ◽  
Exponential Functions ◽  
First Order ◽  
Thermally Activated ◽  
Growth Regime ◽  
Allylamine Hydrochloride ◽  
Kinetics Of ◽  
Thermally Activated Process

We report on the investigation of the influence of UV-B radiation (306 nm) on the salicylic acid mixed with poly(allylamine hydrochloride), PAH, in aqueous solution. UV-Vis spectra versus irradiation time reveal kinetics of photoproducts formation. At pH 9 and 10 are found a growth regime and another of decay of photoproducts formation. In addition, the growth does not depend on temperature, whereas the decay showed a significant dependence on this parameter suggesting a thermally activated process. These processes were well fitted with first-order exponential functions.

Detection of Single-Domain Co2FeAl Nanoparticles Using First-Order Reversal Curve Method

2016 ◽  
Vol 47 (10) ◽  
pp. 5234-5241 ◽  
Author(s):  
Sima Alikhanzadeh-Arani ◽  
Mohammad Almasi-Kashi ◽  
Zahra Pezeshki-Nejad ◽  
Abdolali Ramazani ◽  
Masoud Salavati-Niasari
Keyword(s):  
Single Domain ◽  
First Order ◽  
Curve Method

scholarly journals Spin-liquid behaviour and the interplay between Pokrovsky-Talapov and Ising criticality in the distorted, triangular-lattice, dipolar Ising antiferromagnet

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Andrew Smerald ◽  
Frédéric Mila
Keyword(s):  
Ising Model ◽  
Triangular Lattice ◽  
Lattice Distortion ◽  
Luttinger Liquid ◽  
Spin Liquid ◽  
Dipolar Interactions ◽  
First Order ◽  
Network State ◽  
Ising Antiferromagnet ◽  
Small Lattice

We study the triangular-lattice Ising model with dipolar interactions, inspired by its realisation in artificial arrays of nanomagnets. We show that a classical spin-liquid forms at intermediate temperatures, and that its behaviour can be tuned by temperature and/or a small lattice distortion between a string Luttinger liquid and a domain-wall-network state. At low temperature there is a transition into a magnetically ordered phase, which can be first-order or continous with a crossover in the critical behaviour between Pokrovsky-Talapov and 2D-Ising universality. When the Pokrovsky-Talapov criticality dominates, the transition is essentially of the Kasteleyn type.

Real-Time Monitoring of Hydrogen Elimination Processes in Pulsed-Gas PECVD Using in Situ Mass Spectroscopy

1996 ◽  
Vol 452 ◽  
Author(s):  
Easwar Srinivasan ◽  
Jeremy S. Bordeaux ◽  
Gregory N. Parsons
Keyword(s):  
Mass Spectroscopy ◽  
Order Kinetic ◽  
Elimination Reaction ◽  
Reaction Products ◽  
First Order ◽  
Thermally Activated ◽  
Hydrogen Elimination ◽  
Abstraction Reaction ◽  
Elimination Mechanism

AbstractIn situ mass spectroscopy is used to monitor and analyze the hydrogen elimination reaction products during cyclical exposure of thin films of amorphous silicon to a flux of atomic deuterium. Mass spectroscopy results that atomic deuterium etches deposited silicon forming SiD4 and abstracts hydrogen bonded to silicon in the film to form HD. The relative signal intensities show that abstraction is the primary hydrogen elimination mechanism. The energy of activation for the abstraction reaction is obtained from the mass spectroscopy signals through a first order kinetic analysis and is found to be approximately zero, indicating that abstraction is not thermally activated.

Sign in / Sign up

Export Citation Format

Share Document