Photoluminescence and its damping kinetics of nanoporous alumina membranes formed in solutions of various carboxylic acids

2021 ◽  
Author(s):  
I. A. Vrublevsky ◽  
K. V. Chernyakova ◽  
E. N. Muratova ◽  
Yu. M. Spivak ◽  
V. A. Moshnikov
Keyword(s):  
Carboxylic Acids ◽  
Nanoporous Alumina ◽  
Alumina Membranes ◽  
Kinetics Of

Compact and efficient gas diffusion electrodes based on nanoporous alumina membranes for microfuel cells and gas sensors

The Analyst ◽  
2020 ◽  
Vol 145 (1) ◽  
pp. 122-131 ◽  
Author(s):  
Wanda V. Fernandez ◽  
Rocío T. Tosello ◽  
José L. Fernández
Keyword(s):  
Response Times ◽  
Hydrogen Oxidation ◽  
Fast Response ◽  
Gas Diffusion ◽  
Limiting Current ◽  
Gas Diffusion Electrodes ◽  
Nanoporous Alumina ◽  
Alumina Membranes ◽  
Current Densities ◽  
Microfuel Cells

Gas diffusion electrodes based on nanoporous alumina membranes electrocatalyze hydrogen oxidation at high diffusion-limiting current densities with fast response times.

scholarly journals Nanoporous Alumina Membranes for Sugar Industry: An Investigation of Sintering Parameters Influence onUltrafiltration Performance

2021 ◽  
Vol 13 (14) ◽  
pp. 7593
Author(s):  
Farooq Khan Niazi ◽  
Malik Adeel Umer ◽  
Ashfaq Ahmed ◽  
Muhammad Arslan Hafeez ◽  
Zafar Khan ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Pore Size ◽  
Sugar Industry ◽  
Average Pore Size ◽  
Research Work ◽  
Homogeneous Distribution ◽  
Alumina Membrane ◽  
Average Pore ◽  
Nanoporous Alumina ◽  
Alumina Membranes

Ultrafiltration membranes offer a progressive and efficient means to filter out various process fluids. The prime factor influencing ultrafiltration to a great extent is the porosity of the membranes employed. Regarding membrane development, alumina membranes are extensively studied due to their uniform porosity and mechanical strength. The present research work is specifically aimed towards the investigation of nanoporous alumina membranes, as a function of sintering parameters, on ultrafiltration performance. Alumina membranes are fabricated by sintering at various temperatures ranging from 1200–1300 °C for different holding times between 5–15 h. The morphological analysis, conducted using Scanning electron microscopy (SEM), revealed a homogeneous distribution of pores throughout the surface and cross-section of the membranes developed. It was observed that an increase in the sintering temperature and time resulted in a gradual decrease in the average pore size. A sample with an optimal pore size of 73.65 nm achieved after sintering at 1250 °C for 15 h, was used for the evaluation of ultrafiltration performance. However, the best mechanical strength and highest stress-bearing ability were exhibited by the sample sintered at 1300 °C for 5 h, whereas the sample sintered at 1250 °C for 5 h displayed the highest strain in terms of compression. The selected alumina membrane sample demonstrated excellent performance in the ultrafiltration of sugarcane juice, compared to the other process liquids.

S/X ratio impacts the profile and kinetics of carboxylic acids production from the acidogenic fermentation of dairy wastewater

2021 ◽  
pp. 117605
Author(s):  
Amanda de Sousa e Silva ◽  
Tasso Jorge Tavares Ferreira ◽  
Naassom Wagner Sales Morais ◽  
Erlon Lopes Pereira ◽  
André Bezerra dos Santos
Keyword(s):  
Carboxylic Acids ◽  
Dairy Wastewater ◽  
Acidogenic Fermentation ◽  
Kinetics Of

scholarly journals Magnetization reversal mechanisms in Fe/NiO bilayers grown onto nanoporous alumina membranes and Si wafers

AIP Advances ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 015113
Author(s):  
Enrique Navarro ◽  
María Alonso ◽  
Ana Ruiz ◽  
Unai Urdiroz ◽  
Marta Sánchez-Agudo ◽  
...  
Keyword(s):  
Magnetization Reversal ◽  
Nanoporous Alumina ◽  
Alumina Membranes

scholarly journals Relativistic effects in EELS of nanoporous alumina membranes

2003 ◽  
Vol 68 (24) ◽  
Author(s):  
N. Zabala ◽  
A. G. Pattantyus-Abraham ◽  
A. Rivacoba ◽  
F. J. García de Abajo ◽  
M. O. Wolf
Keyword(s):  
Relativistic Effects ◽  
Nanoporous Alumina ◽  
Alumina Membranes

THE TRANSMISSION OF POLAR EFFECTS: IV. THE KINETICS OF ESTERIFICATION WITH DIAZODIPHENYLMETHANE OF SUBSTITUTED HETEROCYCLIC CARBOXYLIC ACIDS

1966 ◽  
Vol 44 (13) ◽  
pp. 1493-1499 ◽  
Author(s):  
Keith Bowden ◽  
D. C. Parkin
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Rate Coefficients ◽  
Relative Ability ◽  
Indole Carboxylic Acid ◽  
Kinetics Of ◽  
Electron Effects

The rate coefficients for the reaction with diazodiphenylmethane, in ethanol at 30.0°, of a number of substituted indole-2-carboxylic acids, indole-3-carboxylic acids, coumarin-3-carboxylic acids, coumarilic acids, and N-phenylglycines have been determined. The effect of substitution is assessed by use of adapted Hammett and Dewar–Grisdale relations. The relations give good correlations for oxygen-ring heterocyclic systems, and the relative ability of the systems to transmit π-electron effects has been determined. An anomalous perturbing effect appears to operate in the indole-carboxylic acid systems.

scholarly journals Pore spanning lipid bilayers on silanised nanoporous alumina membranes

2008 ◽  
Author(s):  
Abdul M. Md Jani ◽  
Jinwen Zhou ◽  
Matthew R. Nussio ◽  
Dusan Losic ◽  
Joe G. Shapter ◽  
...  
Keyword(s):  
Lipid Bilayers ◽  
Nanoporous Alumina ◽  
Alumina Membranes

Reaction Kinetics for the Hydrolysis of Titanium Isopropoxide Carboxylate Complexes

1992 ◽  
Vol 271 ◽  
Author(s):  
Charles D. Gagliardi ◽  
Dilum Dunuwila ◽  
Beatrice A. Van Vlierberge-Torgerson ◽  
Kris A. Berglund
Keyword(s):  
Carboxylic Acids ◽  
Ceramic Materials ◽  
Titanium Isopropoxide ◽  
General Interest ◽  
Chemical Transformations ◽  
Molecular Precursors ◽  
Novel Applications ◽  
Kinetics Of ◽  
Hydrolysis Of

ABSTRACTTitanium alkoxides modified by carboxylic acids have been widely studied as the molecular precursors to ceramic materials. These alkoxide complexes have also been very useful in the formation of stable, porous, optically clear films having many novel applications such as chemical sensors, catalytic supports, and ion-exchange media. To improve the processing of these materials, it is essential to better understand the kinetics of the chemical transformations which occur.The kinetics of the hydrolysis reaction are studied for selected carboxylic acids using Raman spectroscopy to probe the chemistry of the process. The study has a special emphasis on the titanium isopropoxide-valeric acid system due to the superior quality of these films over other carboxylates. Greater knowledge of the hydrolysis kinetics allows increased control over the quality of the film materials and should be of general interest to those working with modified metal alkoxides.

Sign in / Sign up

Export Citation Format

Share Document