Dispersion mechanism of fluids in a bubble-tray extraction tower, and a method for intensifying it

Atomic Energy ◽  
1961 ◽  
Vol 7 (2) ◽  
pp. 663-664
Author(s):  
N. P. Galkin ◽  
V. B. Tikhomirov ◽  
N. E. Goryainov ◽  
V. D. Fedorov
Keyword(s):  
Dispersion Mechanism ◽  
Extraction Tower ◽  
Bubble Tray

Patternable Quantum-Dot Photoresist with High Photolithographic Uniformity

2021 ◽  
Vol 13 (4) ◽  
pp. 624-631
Author(s):  
Jianyao Lin ◽  
Yu Chen ◽  
Yun Ye ◽  
Sheng Xu ◽  
Tailiang Guo ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Functional Groups ◽  
Ligand Exchange ◽  
Surface Ligands ◽  
Dispersion Mechanism ◽  
Film Forming ◽  
Photolithography Process ◽  
Color Conversion

We present a ligand-exchange-free photo-patternable quantum-dot photoresist (QDPR) with high photolithographic uniformity. The dispersion mechanism between the QD’s surface ligands and the functional groups of photoresist polymers are studied. Results show that the dispersibility and photoluminescent intensity of this QDPR can be both improved by controlling dispersant and antioxidant. For device demonstration, multi-colored quantum dot color conversion films (QDCCF) were prepared and patterned by a photolithography process. High QD dispersibility and film-forming uniformity were both achieved with this QDCCF. It is believed that the proposed QDPR has the potential to be extensively used in lighting or display applications.

Bubble Tray Hydraulics

1947 ◽  
Vol 39 (6) ◽  
pp. 774-778 ◽  
Author(s):  
James A. Davies
Keyword(s):  
Bubble Tray

RBM band shift-evidenced dispersion mechanism of single-wall carbon nanotube bundles with NaDDBS

2007 ◽  
Vol 308 (1) ◽  
pp. 276-284 ◽  
Author(s):  
Shigenori Utsumi ◽  
Mamiko Kanamaru ◽  
Hiroaki Honda ◽  
Hirofumi Kanoh ◽  
Hideki Tanaka ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Band Shift ◽  
Single Wall Carbon Nanotube ◽  
Single Wall Carbon ◽  
Nanotube Bundles ◽  
Dispersion Mechanism

scholarly journals RAFT-photomediated PISA in dispersion: mechanism, optical properties and application in templated synthesis

2019 ◽  
Vol 10 (18) ◽  
pp. 2316-2326 ◽  
Author(s):  
Vitalii Tkachenko ◽  
Camélia Matei Ghimbeu ◽  
Cyril Vaulot ◽  
Loïc Vidal ◽  
Julien Poly ◽  
...  
Keyword(s):  
Optical Properties ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Templated Synthesis ◽  
Dispersion Mechanism

Diblock copolymer nanoparticles were prepared by photomediated polymerization-induced self-assembly (“photo-PISA”) in dispersion.

Dispersion in steady and oscillatory flows through a tube with reversible and irreversible wall reactions

2005 ◽  
Vol 462 (2066) ◽  
pp. 481-515 ◽  
Author(s):  
Chiu-On Ng
Keyword(s):  
Dispersion Coefficient ◽  
Tube Wall ◽  
Dispersion Model ◽  
Small Diameter ◽  
Chemical Species ◽  
Taylor Dispersion ◽  
Phase Partitioning ◽  
Dispersion Mechanism ◽  
Effective Dispersion ◽  
Number Flow

An asymptotic analysis is presented for the advection–diffusion transport of a chemical species in flow through a small-diameter tube, where the flow consists of steady and oscillatory components, and the species may undergo linear reversible (phase exchange or wall retention) and irreversible (decay or absorption) reactions at the tube wall. Both developed and transient concentrations are considered in the analysis; the former is governed by the Taylor dispersion model, while the latter is required in order to formulate proper initial data for the developed mean concentration. The various components of the effective dispersion coefficient, valid when the developed state is attained, are derived as functions of the Schmidt number, flow oscillation frequency, phase partitioning and kinetics of the two reactions. Being more general than those available in the literature, this effective dispersion coefficient incorporates the combined effects of wall retention and absorption on the otherwise classical Taylor dispersion mechanism. It is found that if the phase exchange reaction kinetics is strong enough, the dispersion coefficient is probably to be increased by orders of magnitude by changing the tube wall from being non-retentive to being just weakly retentive.

scholarly journals Dispersion in doublet-type flows through highly anisotropic porous formations

2021 ◽  
Vol 931 ◽  
Author(s):  
Gerardo Severino
Keyword(s):  
Difficult Problem ◽  
Anisotropy Ratio ◽  
Spatial Moments ◽  
Spatial Moment ◽  
Dispersion Mechanism ◽  
Porous Formation ◽  
Perturbative Solution ◽  
Type Flow ◽  
Simplifying Assumptions ◽  
The Difference

Steady doublet-type flow takes place in a porous formation, where the log-transform $Y = \ln K$ of the spatially variable hydraulic conductivity $K$ is regarded as a stationary random field of two-point autocorrelation $\rho _Y$ . A passive solute is injected at the source in the porous formation and we aim to quantify the resulting dispersion process between the two lines by means of spatial moments. The latter depend on the distance $\ell$ between the lines, the variance $\sigma ^2_Y$ of $Y$ and the (anisotropy) ratio $\lambda$ between the vertical and the horizontal integral scales of $Y$ . A simple (analytical) solution to this difficult problem is obtained by adopting a few simplifying assumptions: (i) a perturbative solution, which regards $\sigma ^2_Y$ as a small parameter, of the velocity field is sought; (ii) pore-scale dispersion is neglected; and (iii) we deal with a highly anisotropic formation ( $\lambda \lesssim 0.1$ ). We focus on the longitudinal spatial moment, as it is of most importance for the dispersion mechanism. A general expression is derived in terms of a single quadrature, which can be straightforwardly carried out once the shape of $\rho _Y$ is specified. Results permit one to grasp the main features of the dispersion processes as well as to assess the difference with similar mechanisms observed in other non-uniform flows. In particular, the dispersion in a doublet-type flow is observed to be larger than that generated by a single line. This effect is explained by noting that the advective velocity in a doublet, unlike that in source/line flows, is rapidly increasing in the far field owing to the presence there of the singularity. From the standpoint of the applications, it is shown that the solution pertaining to $\lambda \to 0$ (stratified formation) provides an upper bound for the dispersion mechanism. Such a bound can be used as a conservative limit when, in a remediation procedure, one has to select the strength as well as the distance $\ell$ of the doublet. Finally, the present study lends itself as a valuable tool for aquifer tests and to validate more involved numerical codes accounting for complex boundary conditions.

Effects of Trammonium Citrate on Slurry of PMN-PZT in Gelcasting Process

2012 ◽  
Vol 476-478 ◽  
pp. 1050-1053 ◽  
Author(s):  
Jing Hong Du ◽  
Guo You Gan ◽  
Ji Kang Yan ◽  
Jian Hong Yi ◽  
Jia Min Zhang
Keyword(s):  
Rheological Properties ◽  
Chemical Absorption ◽  
Low Viscosity ◽  
Gel Casting ◽  
Dispersion Mechanism ◽  
Powder Particles ◽  
Sedimentation Volume ◽  
Gelcasting Process ◽  
Slurry Stability ◽  
Slurry Preparation

Preparation of aqueous ceramics slurry with high solid volume and low viscosity is premise and key step of gelcasting, and dispersant play important role in slurry preparation. In this paper, triammonium citrate (TAC) was used as dispersant of PMN-PZT piezoelectric ceramics slurry, the effects of TAC on slurry stability and rheological properties and dispersion mechanism of TAC were investigated by sedimentation test, viscosity, scanning electron microscopy (SEM) and FTIR analysis. The SEM results indicated that TAC could reduce the agglomeration of powder particles and make ceramic particles well-dispersed. FTIR indicated that strong chemical absorption occurred between TAC and PMN-PZT powder, and slurry stability and rheological properties of PMN-PZT slurry were improved through electrostatic interaction of TAC. The effects of TAC on sedimentation volume and viscosity have similar tendency. When TAC content was 7.5vol% and pH of slurry was about10, PMN-PZT slurry suitable for gel-casting could be acquired.

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