Effect of surface coating composition on quantum dot mobility in porous media

2013 ◽  
Vol 15 (8) ◽  
Author(s):  
Yonggang Wang ◽  
Huiguang Zhu ◽  
Matthew D. Becker ◽  
Jessica Englehart ◽  
Linda M. Abriola ◽  
...  
Keyword(s):  
Porous Media ◽  
Quantum Dot ◽  
Surface Coating ◽  
Coating Composition ◽  
Effect Of Surface

scholarly journals Effect of Surface Wettability on Immiscible Displacement in a Microfluidic Porous Media

Energies ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 664 ◽  
Author(s):  
Jorge Avendaño ◽  
Nicolle Lima ◽  
Antonio Quevedo ◽  
Marcio Carvalho
Keyword(s):  
Porous Media ◽  
Water Injection ◽  
Residual Oil ◽  
Strong Function ◽  
Fluid Displacement ◽  
Oil Displacement ◽  
Displacement Front ◽  
Final Volume ◽  
Displacement Experiments ◽  
Effect Of Surface

Wettability has a dramatic impact on fluid displacement in porous media. The pore level physics of one liquid being displaced by another is a strong function of the wetting characteristics of the channel walls. However, the quantification of the effect is still not clear. Conflicting data have shown that in some oil displacement experiments in rocks, the volume of trapped oil falls as the porous media becomes less water-wet, while in some microfluidic experiments the volume of residual oil is higher in oil-wet media. The reasons for this discrepancy are not fully understood. In this study, we analyzed oil displacement by water injection in two microfluidic porous media with different wettability characteristics that had capillaries with constrictions. The resulting oil ganglia size distribution at the end of water injection was quantified by image processing. The results show that in the oil-wet porous media, the displacement front was more uniform and the final volume of remaining oil was smaller, with a much smaller number of large oil ganglia and a larger number of small oil ganglia, when compared to the water-wet media.

Effect of Surface Ligand on Charge Separation and Recombination at CsPbI3 Perovskite Quantum Dot/TiO2 Interfaces

2019 ◽  
Vol 123 (35) ◽  
pp. 21415-21421 ◽  
Author(s):  
Qiongyi Shang ◽  
Brandon D. Piercy ◽  
Mark D. Losego ◽  
Tianquan Lian
Keyword(s):  
Quantum Dot ◽  
Charge Separation ◽  
Surface Ligand ◽  
Effect Of Surface

Effect of Surface Morphology and Microstructure on Powdering Resistance Performance of GA Coatings with Different Aluminum Contents

2014 ◽  
Vol 940 ◽  
pp. 41-45
Author(s):  
Xun Hua Yuan ◽  
Chun Yu Qi ◽  
Qi Fu Zhang
Keyword(s):  
Surface Morphology ◽  
Surface Coating ◽  
Steel Sheet ◽  
X Ray Diffraction ◽  
X Ray ◽  
Inhibition Effect ◽  
Al Content ◽  
Resistance Performance ◽  
Galvannealed Steel ◽  
Effect Of Surface

The surface morphology and microstructure of galvannealed steel sheet (GA) coatings prepared at different galvannealing parameters were analyzed by X-ray diffraction and SEM, and powdering amount of GA coating was investigated by the double-Olsen powdering tester. The results show that when the Al contents below 0.16 wt%, the Ra of GA coating surface was measured namely below 1.0 μm, and powdering amount of GA coating was below 30 mg/m2, it is within a reasonable value required by automotive makers. After that with the Al contents increased in zinc liquid the amount of powdering increased, this means that the powdering resistance performance of GA coating not only depended on the iron content in the coating, but depended on the roughness profiles of the surface coating. When the galvanizing coating with 0.22 wt% Al content and galvannealing at 500 °C, with the inhibition effect of Fe2Al5Znxinhibit layer, the thickness of δ1k-phase was different in the GA coating, which deteriorated the powdering resistance performance of GA coating.

Dimensional instability of cement-bonded particleboard: The effect of surface coating

2004 ◽  
Vol 34 (7) ◽  
pp. 1189-1197 ◽  
Author(s):  
M.Z Fan ◽  
P.W Bonfield ◽  
J.M Dinwoodie ◽  
J Boxall ◽  
M.C Breese
Keyword(s):  
Surface Coating ◽  
Dimensional Instability ◽  
Effect Of Surface

The effect of surface coating for proof-slack of screw conclusion object

2003 ◽  
Vol 2003 (0) ◽  
pp. 33-34
Author(s):  
Hideto SUZUKI ◽  
Tetsuya TAN ◽  
Masashi NAKAMURA
Keyword(s):  
Surface Coating ◽  
Effect Of Surface

scholarly journals Quantitative Imaging and In Situ Concentration Measurements of Quantum Dot Nanomaterials in Variably Saturated Porous Media

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Burcu Uyuşur ◽  
Preston T. Snee ◽  
Chunyan Li ◽  
Christophe J. G. Darnault
Keyword(s):  
Porous Media ◽  
Quantum Dot ◽  
Light Transmission ◽  
Water Saturation ◽  
Uv Light ◽  
Light Exposure ◽  
Fluorescence Method ◽  
Fluorescent Light ◽  
Subsurface Environment

Knowledge of the fate and transport of nanoparticles in the subsurface environment is limited, as techniques to monitor and visualize the transport and distribution of nanoparticles in porous media and measure their in situ concentrations are lacking. To address these issues, we have developed a light transmission and fluorescence method to visualize and measure in situ concentrations of quantum dot (QD) nanoparticles in variably saturated environments. Calibration cells filled with sand as porous medium and various known water saturation levels and QD concentrations were prepared. By measuring the intensity of the light transmitted through porous media exposed to fluorescent light and by measuring the hue of the light emitted by the QDs under UV light exposure, we obtained simultaneously in situ measurements of water saturation and QD nanoparticle concentrations with high spatial and temporal resolutions. Water saturation was directly proportional to the light intensity. A linear relationship was observed between hue-intensity ratio values and QD concentrations for constant water saturation levels. The advantages and limitations of the light transmission and fluorescence method as well as its implications for visualizing and measuring in situ concentrations of QDs nanoparticles in the subsurface environment are discussed.

Sign in / Sign up

Export Citation Format

Share Document