SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Chenxin Lyu,Chengqian Zhang,Baocai Zhang,Xuebin Ni,Jianzhong Fu,Peng Zhao
Magnetic levitation (MagLev) is a well-documented and widely-applied technique in accurate, sensitive, and untethered testing of living and non-living materials in both macroscale and microscale. However, most magnetic levitation configurations face the dilemma between working range and sensitivity, since the distance between the two like-pole-facing magnets are in positive relationship with sensitivity, but negative with measuring range. And there exists a maximum distance for MagLev configurations where the misalignment happens when the distance is too large, which is a restriction on the working space and measurement range of the MagLev devices. In this paper, we propose a novel configuration based on the principle of Halbach array, namely the Cross-Halbach MagLev configuration. By doing parallel comparisons with the Standard MagLev consisting of magnets of the same size, we determined the superiority of the Cross-Halbach configuration in magnetic flux density (0.47 T) and B → ∙ ∇ B → z (6.25 T 2 /m), maximum distance (90 mm), sensitivity (525 mm/(g/cm 3 )) and wide linear zone on B → ∙ ∇ B → z (42 mm). To demonstrate and further explore the potential of the Cross-Halbach MagLev, we carried out a series of experiments, including density measurements of standard beads and different polymers, detection and separation of similar polymers with minute difference in density, and nondestructive detection of voids. The results indicate that the proposed magnetic levitation configuration is competent of density-based applications and can serve as a new solution to high-sensitivity measurement and detection.
研究领域:
物理学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Jiaojiao Chen,Wanjing Cui,Yafei Guo,Lingzong Meng,Hongfang Hou,Tianlong Deng
Densities of the binary systems (NaI + H2O) and (NaIO3 + H2O) were measured by an accurate Anton Paar Digital vibrating-tube densimeter at temperature intervals of 5 K ranging from 283.15 to 353.15 K at ambient pressure and molalities of sodium iodide and sodium iodate ranging from 0.16764 to 2.15208 and 0.02252 to 0.15952 mol kg–1, respectively. Based on the experimental density data of the binary systems (NaI + H2O) and (NaIO3 + H2O), thermal expansion coefficient (α) and apparent molar volume (Vϕ) are obtained using an empirical equation calculation, and the diagram for the relationship between temperature and molality was plotted. According to the Pitzer ion-interaction model of the apparent molar volume, Pitzer single salt parameters β(0)v M.X, β(1)v M.X, and Cv M.X and their correlation coefficients ai of the temperature-dependent equation f(i, p, T) = a1 + a2ln(T/298.15) + a3(T – 298.15) + a4/(620 – T) + a5/(T – 227) (where T is the temperature in Kelvin and ai values are the correlation coefficients) for NaI and NaIO3 were first obtained by the least-squares method. The obtained apparent molar volumes agree well with the experimental values, and these results indicated that the single salt parameters and the temperature-dependent formula obtained in this work were reliable.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2014
·
IF 2.045
Zhuqiang Yang,Qincheng Bi,Yong Guo,Zhaohui Liu,Jianguo Yan,Qiang Zhang
The densities of endothermic hydrocarbon fuel at supercritical pressure condition are measured online using a radial measurement method. The densitometer is based on the attenuation theory of gamma ray using a count rate mode. One advantage of the method is that it is noninstrusive and practical for a small tube measurement. The densitometer was measurably optimized for the design and calibrated by the reference fluids with different density ranges. A kind of endothermic hydrocarbon fuel was measured covering the temperature from (283 to 950) K at the supercritical pressures of (3.0 and 4.0) MPa. The data were regressed with polynomial equations and the isobaric thermal expansion could be obtained by the fitted density curve.
研究领域:
能源工程
·
核技术应用
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Chenxin Lyu,Daofan Tang,Chengqian Zhang,Jun Xie,Qingyan Zhang,Jing Nie,Yong He,Jianzhong Fu,Jingdai Wang,Peng Zhao
Non-contact manipulation and measurement of cells are the major concerns in the biomedical field . However, the existing methods are limited by the physical properties of cells, and may cause damages to the cells. This paper proposes an original non-contact manipulation and measurement method by magnetic levitation . Based on the configuration of two ring magnets with like poles facing each other, the cells can aggregate and levitate in the paramagnetic medium. The mathematical model was established to analyze the distributions of magnetic fields and movements of cells for the first time. Theoretical and experimental results show that the magnetic levitation method can be adaptive to the cells by tuning the size of the configuration. The three-dimensional cell clusters were formed and the average densities of 3T3, MDA, B16 and 4T1 cells were measured as 1.074 ± 0.005 g/cm 3 , 1.084 ± 0.003 g/cm 3 , 1.079 ± 0.002 g/cm 3 and 1.124 ± 0.003 g/cm 3 respectively. Moreover, the dead cells and living cells were distinguished based on the levitating heights. The results indicate that the proposed magnetic levitation method is promising for the three-dimensional culture and rapid measurement of cells.
研究领域:
生物医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
PURE AND APPLIED CHEMISTRY
·
2020
·Vol. 92
·期 10
·1673-1682
·
IF 1.919
Wanjing Cui,Hongfang Hou,Jiaojiao Chen,Yafei Guo,Lingzong Meng,Tianlong Deng
Densities of the sodium arsenate aqueous solution with the molality varied from (0.04165 to 0.37306) mol · kg −1 were determined experimentally at temperature intervals of 5 K from 283.15 K to 363.15 K and ambient pressure using a precise Anton Paar Digital vibrating-tube densimeter. The apparent molar volumes ( V
ϕ
), thermal expansion coefficient ( α ) and partial molar volume
(
V
¯
B
)
were obtained based on the results of density measurement. The 3D diagram of apparent molar volume against temperature and molality as well as the diagram of thermal expansion coefficient and partial molar volume against molality were plotted, respectively. On the basis of the Pitzer ion-interaction equation of apparent molar volume model, the Pitzer single-salt parameters (
(
β
M,X
(
0
)
v
,
β
M,X
(
1
)
v
,
β
M,X
(
2
)
v
and
C
M,X
v
,
M
X
=
N
a
3
A
s
O
4
)
and their temperature-dependent correlation F ( i , p , T ) = a
1 + a
2 ln( T /298.15) + a
3 ( T – 298.15) + a
4 /(620 – T ) + a
5 /( T – 227) (where T is temperature in Kelvin, a
i
is the correlation coefficient) for Na 3 AsO 4 were obtained on account of the least-squares method. Predictive apparent molar volumes agree well with the experimental values, and those results indicate that the single-salt parameters and their relational coefficients of temperature-dependence for Na 3 AsO 4 obtained are reliable.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Kai Kang,Xiaodong Liang,Georgios M. Kontogeorgis,Xiaopo Wang
In this work, the experimental measurements for liquid densities of n -decane and m -xylene binary mixtures were performed over the entire composition range with a high-pressure vibrating-tube densimeter. The range of temperatures for the present measurements was from 293.15 K to 363.15 K and the pressures were up to 60 MPa. The combined expanded uncertainty of the density measurements is estimated to be 0.001 ρ with 0.95 confidence. Experimental density values were correlated by the modified Tammann-Tait equation. The simplified Perturbed Associating Fluid Theory (sPC-SAFT) and Cubic Plus Associated (CPA) equations of state (EoS) were applied to predict the densities of n -decane and m -xylene and their mixtures. Reasonably results were observed between the experimental data and calculated results for the two equations, and the deviation is less than 0.48% and 0.89% with sPC-SAFT and CPA EoS, respectively. In addition, excess molar volumes were determined from the experimental density data as well as from sPC-SAFT and CPA models. The effects of pressure and temperature on the excess molar volume were also discussed.
研究领域:
化学工程
·
热力学
·
流体相行为
·
高压物理化学
·
状态方程建模
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2022
·
IF 3.378
Song Feng,Qincheng Bi,Wenlin Liao
A novel densimeter based on a random temperature signal cross-correlation method was designed and constructed. Liquid densities of n -decane were measured at T = (293.2–493.5) K and p = (0.1–20.0) MPa. The expanded uncertainties in liquid density measurements are 1.16%, with a confidence level of 0.95 ( k = 2). This experimental study provides new n -decane densities to examine Lemmon's equations' accuracy at high temperatures and pressures, where few experimental densities are yet to be reported. The experimental data's average absolute deviation ( AAD ) and maximum absolute deviation ( MAD ) compared to the fitted data from Lemmon's equations are 0.15% and 0.43%, respectively. The liquid densities at high temperatures and pressures were fitted with a Tait-type equation. The physical meaning and temperature behavior of the Tait correlation's parameters were discussed. The average absolute deviation ( AAD ) between the experimental and calculated data from the Tait-type equation is 0.23%.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Hailong Pan,Shijie Yan,Yiyun Zhang,Jialun Du,Xiaoyu Zhang,Pijun Gong,Haitao Wu,Huanrong Tian,Michael Wübbenhorst
A series of Ce 2 [Zr 1- x (A) x ] 3 (MoO 4 ) 9 (A = Sr 1/3 Ta 2/3 , Sr 1/3 Sb 2/3 ; x = 0.02, 0.04, 0.06, 0.08 and 0.10) (abbreviated as CZ 1- x T x and CZ 1- x S x ) microwave dielectric ceramics were studied systematically with respect to microstructures, sintering behaviors, crystal structures, microwave dielectric properties and infrared vibrational modes. Density measurements and scanning electron microscopy (SEM) reveal the dense and homogeneous microstructures. X-ray diffraction (XRD) results confirm the formation of solid solutions belonging to the hexagonal system with a R 3 ‾ c space group, and the lattice volume increases with raising the doping content. Furthermore, the complex chemical bond theory was used to calculate the intrinsic bond parameters, and the correlations between the microwave dielectric properties and intrinsic bond parameters were established. Finally, far infrared (FIR) spectra reveal that the main polarization contribution stems from the absorptions of the phonon oscillations in these two groups of ceramics. Typically, the optimum microwave dielectric properties are achieved for CZ 0.9 T 0.1 and CZ 0.94 S 0.06 ceramics with ε r = 10.24, Q × f = 92,009 GHz (at 9.70 GHz), τ f = −8.84 ppm °C −1 and ε r = 10.40, Q × f = 82,696 GHz (at 9.69 GHz) and τ f = −8.04 ppm °C −1 , respectively. Interestingly, the CZ 0.9 T 0.1 ceramic exhibits the maximum Q × f value in the ion doped Ce 2 Zr 3 (MoO 4 ) 9 ceramics while retaining a good τ f = −8.84 ppm °C −1 .
研究领域:
材料科学
·
陶瓷
·
介电材料
·
固体化学
·
微波工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）