Using epichlorohydrin for a simultaneous increase of functional group hydrophilicity and spatial separation from the matrix of anion exchangers for ion chromatography

2014 ◽  
Vol 69 (4) ◽  
pp. 168-174 ◽  
Author(s):  
O. I. Shchukina ◽  
A. V. Zatirakha ◽  
A. D. Smolenkov ◽  
O. A. Shpigun
Keyword(s):  
Ion Chromatography ◽  
Functional Group ◽  
Spatial Separation ◽  
Simultaneous Increase ◽  
Anion Exchangers ◽  
The Matrix

Effects of microstructure and lattice misfit on creep life of Ni-based single crystal superalloy during long-term thermal exposure

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Wenyan Gan ◽  
Hangshan Gao ◽  
Haiqing Pei ◽  
Zhixun Wen
Keyword(s):  
Single Crystal ◽  
Rupture Life ◽  
Precipitation Amount ◽  
Lattice Misfit ◽  
Thermal Exposure ◽  
Phase Evolution ◽  
Creep Rupture ◽  
Simultaneous Increase ◽  
Creep Life ◽  
The Matrix

Abstract According to the microstructural evolution during longterm thermal exposure at 1100 °C, the creep rupture life of Ni-based single crystal superalloys at 980 °C/270 MPa was evaluated. The microstructure was characterized by means of scanning electron microscopy, X-ray diffraction and related image processing methods. The size of γ’ precipitates and the precipitation amount of topologically close-packed increased with the increase in thermal exposure time, and coarsening of the γ’ precipitates led to the simultaneous increase of the matrix channel width. The relationship between the creep rupture life and the lattice misfit of γ/γ’, the coarsening of γ’ precipitate and the precipitation of TCP phase are systematically discussed. In addition, according to the correlation between γ’ phase evolution and creep characteristics during thermal exposure, a physical model is established to predict the remaining creep life.

Anion exchangers with negatively charged functionalities in hyperbranched ion-exchange layers for ion chromatography

2017 ◽  
Vol 1482 ◽  
pp. 57-64 ◽  
Author(s):  
Anna S. Uzhel ◽  
Alexandra V. Zatirakha ◽  
Konstantin N. Smirnov ◽  
Alexandr D. Smolenkov ◽  
Oleg A. Shpigun
Keyword(s):  
Ion Exchange ◽  
Ion Chromatography ◽  
Anion Exchangers

Novel polymer-based anion-exchangers with covalently-bonded functional layers of quaternized polyethyleneimine for ion chromatography

2017 ◽  
Vol 964 ◽  
pp. 187-194 ◽  
Author(s):  
O.I. Shchukina ◽  
A.V. Zatirakha ◽  
A.S. Uzhel ◽  
A.D. Smolenkov ◽  
O.A. Shpigun
Keyword(s):  
Ion Chromatography ◽  
Anion Exchangers ◽  
Covalently Bonded

Covalently-bonded hyperbranched poly(styrene-divinylbenzene)-based anion exchangers for ion chromatography

2016 ◽  
Vol 1470 ◽  
pp. 97-103 ◽  
Author(s):  
A.S. Uzhel ◽  
A.V. Zatirakha ◽  
O.I. Shchukina ◽  
A.D. Smolenkov ◽  
O.A. Shpigun
Keyword(s):  
Ion Chromatography ◽  
Anion Exchangers ◽  
Hyperbranched Poly ◽  
Covalently Bonded ◽  
Styrene Divinylbenzene

Graphene-coated polymeric anion exchangers for ion chromatography

2017 ◽  
Vol 970 ◽  
pp. 73-81 ◽  
Author(s):  
Kai Zhang ◽  
Minyi Cao ◽  
Chaoyan Lou ◽  
Shuchao Wu ◽  
Peimin Zhang ◽  
...  
Keyword(s):  
Ion Chromatography ◽  
Anion Exchangers ◽  
Polymeric Anion

scholarly journals Pressure effect on the electrical resistance of Y0.77Pr0.23Ba2Cu3O7-δ single crystals

2020 ◽  
Keyword(s):  
Critical Temperature ◽  
Hydrostatic Pressure ◽  
Single Crystals ◽  
Electrical Resistance ◽  
Simultaneous Increase ◽  
Critical Temperatures ◽  
Electron Phonon Interaction ◽  
The Matrix ◽  
Critical Temperature Tc ◽  
Effect Of Hydrostatic Pressure

The effect of hydrostatic pressure up to 12 kbar on the electrical resistance in the basal ab-plane of optimally oxygen-doped (δ<0.1) single crystals Y1–xPrxBa2Cu3O7–δ moderately doped with praseodymium (x≈0.23) with a critical temperature Tc≈67 K. Compared to undoped single-crystal YBa2Cu3O7–δ, doping with praseodymium led to a decrease in the critical temperature by ≈24 K with a simultaneous increase in ρab (300 K) by ≈130 μΩcm. In the region of the transition to the superconducting state, several clearly pronounced peaks are observed on the dρ/dT – T curves, which indicates the presence of several phases with different critical temperatures in the sample. The application of high hydrostatic pressure leads to an increase in Tc by about 3 K. This increase slows down with increasing pressure, and the baric derivatives, dTc/dP, decrease from 0.44 K/kbar at atmospheric pressure to 0.14 K/kbar at 11 kbar. The comparatively weak change in the critical temperature under the action of hydrostatic pressure is due to the relatively small value of the orthorhombic distortion, (a–b)/a. The change in the baric derivative dTc/dP upon all-round compression of the sample is due to the fact that, along with an increase in the Debye temperature, the matrix element of the electron-phonon interaction also increases. Possible mechanisms of the effect of high pressure on Tc are discussed taking into account the presence of features in the electronic spectrum of carriers.

scholarly journals Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution

2019 ◽  
Vol 10 (1) ◽  
pp. 1
Author(s):  
Yue Sun ◽  
Xiao Li ◽  
Weisheng Zheng ◽  
Xinchun Ding ◽  
Rajendra Prasad Singh
Keyword(s):  
Anion Exchange ◽  
Sulfonic Acid ◽  
Industrial Wastewater ◽  
Functional Group ◽  
Fixed Bed ◽  
Anion Exchangers ◽  
Anion Exchange Resins ◽  
Toluene Sulfonic Acid ◽  
Group Density ◽  
Exchange Resins

Adsorption using anion exchange resins is an efficient method for the removal of aromatic sulfonic acids (ASAs) from industrial wastewater. In this study, a series of weak-base anion exchangers (SD1–SD5) were synthesized to investigate the effect of functional group density of resins on the adsorption of ASAs from wastewater containing competitive inorganic anions. p-Toluene sulfonic acid (PTSA) was selected as a target pollutant, and Na2SO4 was chosen as the competitive inorganic salt because of its widespread existence in industrial wastewater. Adsorption performances of these resins were evaluated and compared in terms of selectivity, kinetics, isotherms, regeneration, and dynamic adsorption behavior. Importantly, the PTSA uptake increased with the raising content of functional groups on resins in the absence of Na2SO4; however, in the presence of a high level of Na2SO4 (for example, ≥1%), a decrease in the functional group density could improve the adsorption capacity of resins for PTSA. Moreover, desorption and fixed bed column experiments were conducted in all resins, thereby confirming the effect of functional group density of resins on the PTSA adsorption in actual application. In brief, this research will provide a better understanding for the design and preparation of anion exchangers for the effective removal of ASA from wastewater.

Sign in / Sign up

Export Citation Format

Share Document