scholarly journals Simulating the operation of 10 MHz quartz crystal microbalance under the effection of fluid used couple field method

2016 ◽  
Vol 19 (4) ◽  
pp. 207-213
Author(s):  
Phuoc Tan Duong ◽  
Giang Dang Nguyen ◽  
Ly Huu Truong ◽  
Dung Tram Ngoc Le ◽  
Long Le Thanh Vu ◽  
...  
Keyword(s):  
Chemical Sensors ◽  
Quartz Crystal ◽  
Dynamic Method ◽  
Fluid Dynamic ◽  
High Viscosity ◽  
Field Method ◽  
Couple Field ◽  
Viscosity Fluid ◽  
Field Element

This article presents the simulation of operation of 10 MHz resonance frequency quartz crystal microblance device QCM in case of fluid domain (blood, water, high viscosity fluid …). Because QCM device operates in piezoelectric substrate, simulation has to use the structure-electric couple field element (SOLID 226). Determination of behaviors of device in the case of fluid domain is important for applications. Couple field method (structure-fluid) including finite element method and computational fluid dynamic method was used to determine output signals. The loading quantitative method on surface’s devices was built for the applications in biological and chemical sensors.

Partially Filled Flow Simulation Using Meshfree Method for High Viscosity Fluid in Plastic Mixer

2019 ◽  
Vol 34 (2) ◽  
pp. 279-289
Author(s):  
K. Sekiyama ◽  
S. Yamada ◽  
T. Nakagawa ◽  
Y. Nakayama ◽  
T. Kajiwara
Keyword(s):  
Flow Simulation ◽  
Meshfree Method ◽  
High Viscosity ◽  
Viscosity Fluid

Selectivity coefficients of some simple and complex inorganic ions for Spheron DEAE

1984 ◽  
Vol 49 (10) ◽  
pp. 2349-2354 ◽  
Author(s):  
František Vláčil ◽  
Karel Koňák
Keyword(s):  
Ion Exchange ◽  
Mobile Phase ◽  
Dynamic Method ◽  
Precious Metals ◽  
Inorganic Ions ◽  
Chromatographic Determination ◽  
Chloride Ions ◽  
Chloro Complexes ◽  
Selectivity Coefficients

The selectivity coefficients of the nitrate and chloride ions and of anionic chloro complexes of Au(III), Rh(III), Pd(II), and Pt(IV) for ion exchange on Spheron DEAE in the chloride form are determined by the dynamic method. the complex anion species formed are identified and the ion exchange nature of the sorption of precious metals on this sorbent is confirmed based on the elution order of the precious metals as determined previously by the column chromatography on Spheron DEAE using hydrochloric acid as the mobile phase. The effect of the presence of perchlorate in the mobile phase during the liquid chromatography of precious metals and during the chromatographic determination of nitrate traces is explained.

Extra-Column Effects in Determination of Rate Parameters by the Chromatographic Method

1996 ◽  
Vol 61 (6) ◽  
pp. 844-855 ◽  
Author(s):  
Olga Šolcová ◽  
Petr Schneider
Keyword(s):  
Chromatographic Method ◽  
Dynamic Method ◽  
Axial Dispersion ◽  
Transport Parameters ◽  
Porous Particles ◽  
Loop Detector ◽  
Single Pellet ◽  
Set Up ◽  
Extra Column Effects

It was shown that the sampling loop, detector and connecting elements in the chromatographic set-up for determination of transport parameters by the dynamic method significantly influence the response peaks from columns packed with porous or nonporous particles. A method, based on the use of convolution theorem, was developed which can take these effects into account. The applicability of this method was demonstrated on the case of axial dispersion in a single-pellet-string column (SPSR) packed with nonporous particles. It is possible to handle also responses from columns packed with porous particles by a similar procedure.

Rapidly extracted (0.02 M CaCl2-soluble) reactive aluminum as a measure of aluminum toxicity in soils

Soil Research ◽  
1989 ◽  
Vol 27 (4) ◽  
pp. 663 ◽  
Author(s):  
EA Close ◽  
HKJ Powell
Keyword(s):  
Salicylic Acid ◽  
White Clover ◽  
Aluminum Toxicity ◽  
Maximum Yield ◽  
Acid Soils ◽  
Aluminium Toxicity ◽  
Field Method ◽  
Colorimetric Analysis ◽  
Aluminium Species

This paper examines the use of short extraction times, and the determination of aluminium with chrome azurol S (CAS), for the estimation of 0.02 M CaCl2-soluble aluminium in soils. It reports the correlation between CAS-reactive aluminium in 5 min extracts and percent maximum yield of white clover (Trifolium repens) for a series of acid soils. The reactivity of soluble and colloidal aluminium species with the metallochromic reagent CAS has been assessed. ~ l ( a q ) ~ + , simple hydroxy species and complexes of weakly binding ligands (salicylic acid, tannins) are CAS-reactive (2 rnin). In contrast, complexes of strongly binding ligands (citric acid, fulvic acid) are not CAS-reactive ([Al] ~ [L] ~ [CAS] ~ 1-2~10-5 M). For a series of six limed phosphated topsoils and subsoils (pH 4.2-5.5), 0.02 M CaCl2- soluble aluminium, as determined with CAS, was negatively correlated against the percent maximum yield of white clover; r2 = -0.73** (5 min extraction), n = 20. This correlation is similar to that for yield against total aluminium as determined by atomic absorption spectroscopy after 60 min extraction (r2 = -0.77**). However, the colorimetric analysis is more convenient and sensitive; further, it does not measure colloidal and polymeric aluminium species (which may not be plant-available). The satisfactory correlation achieved for short extraction times suggests use of CAS for a rapid field method for aluminium toxicity in soils.

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