SIMPLE EVALUATION OF ENANTIOMER-SELECTIVITY OF CROWN ETHER USING MEMBRANE ELECTRODE

1980 ◽  
Vol 9 (7) ◽  
pp. 769-772 ◽  
Author(s):  
Yuta Yasaka ◽  
Takashi Yamamoto ◽  
Keiichi Kimura ◽  
Toshiyuki Shono
Keyword(s):  
Crown Ether ◽  
Membrane Electrode ◽  
Enantiomer Selectivity ◽  
Simple Evaluation

Enantiomer-Selectivity of Ion-selective Electrodes Based on a Chiral Crown-ether Ionophore

1997 ◽  
Vol 30 (9) ◽  
pp. 1591-1609 ◽  
Author(s):  
Viola Horváth ◽  
Tímea Takécs ◽  
George Horvai ◽  
Peter Huszthy ◽  
Jerald S. Bradshaw ◽  
...  
Keyword(s):  
Crown Ether ◽  
Ion Selective Electrodes ◽  
Chiral Crown Ether ◽  
Enantiomer Selectivity

Sodium ion-selective membrane electrode based on a new crown ether

1988 ◽  
Vol 212 ◽  
pp. 325-329 ◽  
Author(s):  
Xingyao Zhou ◽  
Yong Luo ◽  
Chengtai Wu ◽  
Zhenfu Zou ◽  
Qizh Hu
Keyword(s):  
Crown Ether ◽  
Sodium Ion ◽  
Membrane Electrode ◽  
Selective Membrane

A novel iron(III) selective membrane electrode based on benzo-18-crown-6 crown ether and its applications

2007 ◽  
Vol 288 (1-2) ◽  
pp. 36-40 ◽  
Author(s):  
Güler Ekmekci ◽  
Demet Uzun ◽  
Güler Somer ◽  
Şükrü Kalaycı
Keyword(s):  
Crown Ether ◽  
Membrane Electrode ◽  
Selective Membrane

Eliminating Invisible Barriers: Health Web Site Accessibility

2003 ◽  
Vol 1 (1) ◽  
pp. 70-86
Author(s):  
Christine Rzepka
Keyword(s):  
Health Information ◽  
Web Sites ◽  
Web Site ◽  
People With Disabilities ◽  
High Tech ◽  
Accessibility Issues ◽  
Accessibility Guidelines ◽  
Use Of The Internet ◽  
Simple Evaluation ◽  
The Web

One of the top reasons given for use of the internet is the ability to search for health information. However, much of the planning for web-based health information often fails to consider accessibility issues. If health care organizations and community agencies’ web sites have the latest, most wellresearched information on the health topics of the day, it is useless to those who cannot access it because of invisible technological barriers. Many flashy, high-tech sites were designed only to appeal to the needs of the mainstream population, with no consideration given to how people with disabilities must adapt their use of the web in order to access information. This article addresses issues of access specific to web site development, and will explore barriers to accessibility frequently experienced by web users with disabilities, requirements for ADA compliance, and how people with disabilities use the web. Web site accessibility guidelines, as well as simple evaluation tools, will be discussed. A thorough review of the article will enable even the least tech-savvy of health educators to enhance their skills in planning and evaluating web sites to promote access for people with disabilities.

2,2’-Dipyridylamine as Organic Molecular Electrocatalyst for Hydrogen Evolution Reaction in Acidic Electrolytes

2019 ◽  
Author(s):  
Xi Yin ◽  
Ling Lin ◽  
Hoon T. Chung ◽  
Ulises Martinez ◽  
Andrew M. Baker ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Density Functional ◽  
Low Cost ◽  
Membrane Electrode Assembly ◽  
Carbon Surface ◽  
Membrane Electrode ◽  
Durability Test ◽  
Onset Potential ◽  
Precious Metal Catalysts

Finding a low-cost and stable electrocatalyst for hydrogen evolution reaction (HER) as a replacement for scarce and expensive precious metal catalysts has attracted significant interest from chemical and materials research communities. Here, we demonstrate an organic catalyst based on 2,2’-dipyridylamine (dpa) molecules adsorbed on carbon surface, which shows remarkable hydrogen evolution activity and performance durability in strongly acidic polymer electrolytes without involving any metal. The HER onset potential at dpa adsorbed on carbon has been found to be less than 50 mV in sulfuric acid and in a Nafion-based membrane electrode assembly (MEA). At the same time, this catalyst has shown no performance loss in a 60-hour durability test. The HER reaction mechanisms and the low onset overpotential in this system are revealed based on electrochemical study. Density functional theory (DFT) calculations suggest that the pyridyl-N functions as the active site for H adsorption with a free energy of -0.13 eV, in agreement with the unusually low onset overpotential for an organic molecular catalyst.<br>

2,2’-Dipyridylamine as Organic Molecular Electrocatalyst for Hydrogen Evolution Reaction in Acidic Electrolytes

2019 ◽  
Author(s):  
Xi Yin ◽  
Ling Lin ◽  
Hoon T. Chung ◽  
Ulises Martinez ◽  
Andrew M. Baker ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Density Functional ◽  
Low Cost ◽  
Membrane Electrode Assembly ◽  
Carbon Surface ◽  
Membrane Electrode ◽  
Durability Test ◽  
Onset Potential ◽  
Precious Metal Catalysts

Finding a low-cost and stable electrocatalyst for hydrogen evolution reaction (HER) as a replacement for scarce and expensive precious metal catalysts has attracted significant interest from chemical and materials research communities. Here, we demonstrate an organic catalyst based on 2,2’-dipyridylamine (dpa) molecules adsorbed on carbon surface, which shows remarkable hydrogen evolution activity and performance durability in strongly acidic polymer electrolytes without involving any metal. The HER onset potential at dpa adsorbed on carbon has been found to be less than 50 mV in sulfuric acid and in a Nafion-based membrane electrode assembly (MEA). At the same time, this catalyst has shown no performance loss in a 60-hour durability test. The HER reaction mechanisms and the low onset overpotential in this system are revealed based on electrochemical study. Density functional theory (DFT) calculations suggest that the pyridyl-N functions as the active site for H adsorption with a free energy of -0.13 eV, in agreement with the unusually low onset overpotential for an organic molecular catalyst.<br>

Preparation and Gas Sensitivity of Crown Ether Metal Complex Film Gas Sensor

2020 ◽  
Vol 2 (1) ◽  
pp. 1-12
Author(s):  
Gulgina Mamtimin ◽  
Halisa Arkin ◽  
Patima Nizamidin ◽  
Erkin Tursun ◽  
Abliz Yimit
Keyword(s):  
Crown Ether ◽  
Metal Complex ◽  
Gas Sensor ◽  
Gas Sensitivity ◽  
Complex Film
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