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Related Concept Videos

Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
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According to Charles Cooley, we base our image on what we think other people see (Cooley 1902). We imagine how we must appear to others, then react to this speculation. We don certain clothes, prepare our hair in a particular manner, wear makeup, use cologne, and the like—all with the notion that our presentation of ourselves is going to affect how others perceive us. We expect a certain reaction, and, if lucky, we get the one we desire and feel good about it. But more than that, Cooley...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
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Electrowetting-based Digital Microfluidics Platform for Automated Enzyme-linked Immunosorbent Assay
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Additively Manufactured Digital Microfluidic Platforms for Ion-Selective Sensing.

Xin Min1, Chao Bao1, Woo Soo Kim1

  • 1Additive Manufacturing Laboratory, School of Mechatronic Systems Engineering , Simon Fraser University , Surrey , British Columbia V3T 0A3 , Canada.

ACS Sensors
|March 12, 2019
PubMed
Summary
This summary is machine-generated.

This study introduces a digital microfluidic (DMF) system for precise ion detection. The integrated platform enables selective ion sensing and blending, overcoming limitations of conventional microfluidic devices.

Keywords:
3D printingdigital microfluidicsion-selective sensinglab-on-a-chipportable sensing platform

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Area of Science:

  • Microfluidics
  • Analytical Chemistry
  • Sensor Technology

Background:

  • Digital microfluidic (DMF) systems offer discrete, accurate, and automated liquid handling.
  • Conventional microfluidics often require complex pumping systems and external liquid carriers.
  • DMF platforms are ideal for sensing but rarely utilized for ion-selective detection.

Purpose of the Study:

  • To develop an integrated DMF system for facile blending and selective detection of ions.
  • To demonstrate controlled droplet manipulation for advanced analytical applications.
  • To enable ion-selective sensing within a microfluidic environment.

Main Methods:

  • Fabrication of an integrated DMF platform using additive manufacturing.
  • Implementation of a real-time droplet motion monitoring and feedback system.
  • Integration of on-chip ion-selective membranes for interference studies.

Main Results:

  • Demonstrated controlled droplet manipulation, including actuation, mixing, and speed control.
  • Achieved selective detection of a targeted primary ion within a concentration range of 10⁻⁶ M to 1 M.
  • Investigated interference effects using blended ions on the developed platform.

Conclusions:

  • The integrated DMF system provides a versatile platform for controlled ion manipulation and selective sensing.
  • This approach offers a significant advancement for microfluidic-based ion detection.
  • The system shows potential for various applications in chemistry and biology requiring precise ion analysis.