G215 Non-intrusive Measurement of Ion Concentration Distribution in Mixed Field of Electrolyte Solution using Polarization CARS

2015 ◽  
Vol 2015 (0) ◽  
pp. _G215-1_-_G215-2_
Author(s):  
Takayuki Minami ◽  
Yohei Sato
Keyword(s):  
Electrolyte Solution ◽  
Concentration Distribution ◽  
Ion Concentration ◽  
Mixed Field

Research on Chloride Diffusion Model of PC with Chloride Attack in Marine Atmosphere Zone

2014 ◽  
Vol 711 ◽  
pp. 481-484
Author(s):  
Yu Chen ◽  
Jie Xu ◽  
Rong Gui Liu ◽  
Su Bi Chen ◽  
Yuan Gao
Keyword(s):  
Prestressed Concrete ◽  
Concentration Distribution ◽  
Concrete Structures ◽  
Chloride Concentration ◽  
Chloride Ion ◽  
Ion Concentration ◽  
Chloride Diffusion ◽  
Marine Atmosphere ◽  
Ion Diffusion ◽  
Chloride Ion Diffusion

Based on the existing studies about chloride ion erosion in prestressed concrete structures, this paper intends to discuss the effects of the stress level and environment factors (including temperature and humidity, etc.) on chloride ion diffusion under marine atmosphere zone. The investigation from pre-stressed concrete crossbeams which service for 39 years in Lianyungang Port shows the chloride ion concentration distribution and chloride ion diffusion. According to the chloride ion concentration distribution, it finds that chloride ion concentration values in pre-concrete structures is Cmax,1> Cmax,2. In addition, the free chloride concentration distribution values go down smoothly after the second peak. Therefore, the result shows that the improved model can be used in marine atmosphere zone.

scholarly journals Hydrogeochemistry of the Paravanar River Sub-Basin, Cuddalore District, Tamilnadu, India

2011 ◽  
Vol 8 (2) ◽  
pp. 835-845 ◽  
Author(s):  
K. Shankar ◽  
S. Aravindan ◽  
S. Rajendran
Keyword(s):  
Groundwater Quality ◽  
Ion Concentration ◽  
Quality Data ◽  
Gis Mapping ◽  
Mapping Technique ◽  
Thematic Maps ◽  
Hydrogen Ion Concentration ◽  
North East ◽  
South Central ◽  
Mixed Field

To assess the groundwater quality of the Paravanar river basin, groundwater data were collected by conventional methods. Hydrogeochemical facies of groundwater of study area reveals fresh to brackish and alkaline in nature. Piper plot shows that most of the groundwater samples fall in the mixed field of Ca-Mg-Cl type. Using GIS mapping technique, major element concentration of groundwater has been interpolated and studied. Groundwater thematic maps on electrical conductivity (EC), hydrogen ion concentration, bicarbonates, chlorides and nitrates were prepared from the groundwater quality data. Different classes in thematic maps were categorized as i) good, ii) moderate and iii) poor with respect to groundwater quality. Northeast and southeast parts of the study area represent the doubtful water class regarding the concentration of EC to represent connate nature of water adjacent to the coast. NNE (North-North-East) and southern parts of the study area have pH ranging from 7 to 8 indicating acidic nature as they were from the weathered Cuddalore sandstone. As northern part of the study area is irrigated, fertilizer used for agriculture may be the source for increase in concentration of nitrates. Chloride clusters in the south central part of the study area from coast up to NLC mines and reveals the chloridization of aquifer in 48 years either due to upwelling of connate water from the deeper aquifer as a result of depressurization of Neyveli aquifer for the safe mining of lignite.

Autophoresis of two adsorbing/desorbing particles in an electrolyte solution

2019 ◽  
Vol 865 ◽  
pp. 440-459 ◽  
Author(s):  
Fan Yang ◽  
Bhargav Rallabandi ◽  
Howard A. Stone
Keyword(s):  
Linear Relationship ◽  
Electrolyte Solution ◽  
Concentration Gradient ◽  
Debye Length ◽  
Chemical Processes ◽  
Ion Concentration ◽  
Nonlinear Dependence ◽  
Surface Chemical

Classical diffusiophoresis describes the motion of particles in an electrolyte or non-electrolyte solution with an imposed concentration gradient. We investigate the autophoresis of two particles in an electrolyte solution where the concentration gradient is produced by either adsorption or desorption of ions at the particle surfaces. We find that when the sorption fluxes are large, the ion concentration near the particle surfaces, and consequently the Debye length, is strongly modified, resulting in a nonlinear dependence of the phoretic speed on the sorption flux. In particular, we show that the phoretic velocity saturates at a finite value for large desorption fluxes, but depends superlinearly on the flux for adsorption fluxes, where both conclusions are in contrast with previous results that predict a linear relationship between autophoretic velocity and sorption flux. Our theory can also be applied to precipitation/dissolution and other surface chemical processes.

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