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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.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
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Steel Manufacturing01:26

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Steel manufacturing is a multi-stage process that begins by smelting iron ore into cast iron in a blast furnace. This initial stage involves layering iron ore with coke, a type of fuel, and crushed limestone within the furnace. The coke is ignited with a high volume of air, leading to the creation of carbon monoxide, which acts to reduce the iron ore to pure iron.
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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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When understanding the effects of multiple forces acting on an object, vector addition is a crucial concept to grasp. This mathematical concept can be used to calculate the net force acting on an object when two or more forces are involved.
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The eukaryotic nucleus is a double membrane-bound organelle that contains nearly all of the cell’s genetic material in the form of chromosomes. It is rightly called the “brain” of the cell as it shoulders the responsibility of responding to various physiological processes, stress, altered metabolic conditions, and other cellular signals. 
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Additive Manufacturing of Functionally Graded Ceramic Materials by Stereolithography
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Nanotribological Printing: A Nanoscale Additive Manufacturing Method.

H S Khare, N N Gosvami, I Lahouij

    Nano Letters
    |October 24, 2018
    PubMed
    Summary

    Nanotribological Printing (NTP) is a new nanoscale additive manufacturing technique. It uses atomic force microscope probes to create detailed patterns with robust mechanical properties, enabling versatile material fabrication.

    Keywords:
    AFMScanning probe lithographyadditive manufacturingnanolithographynanomanufacturing

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Mechanical Engineering

    Background:

    • Additive manufacturing is revolutionizing fabrication, but nanoscale methods are underdeveloped.
    • Existing techniques struggle with material diversity and mechanical robustness at the nanoscale.
    • Developing new nanoscale additive manufacturing methods is crucial for advanced engineered systems.

    Purpose of the Study:

    • Introduce a novel nanoscale additive manufacturing technique: Nanotribological Printing (NTP).
    • Demonstrate NTP's capability to fabricate diverse nanoscale structures with controlled properties.
    • Establish NTP as an accessible and versatile method for nanoscale fabrication.

    Main Methods:

    • Utilizes tribomechanical and tribochemical surface interactions between an atomic force microscope (AFM) probe and a substrate.
    • Employs nanoparticles or molecules in a carrier fluid as the "ink", entrained by probe contact.
    • Relies on normal and shear contact stresses for localized material patterning.

    Main Results:

    • Achieved precise control over pattern dimensions (sub-100 nm lateral, sub-5 nm thickness).
    • Successfully created amorphous, polycrystalline, and nanocomposite structures, including multi-material deposition.
    • Manufactured structures exhibited mechanical properties comparable to bulk materials.

    Conclusions:

    • Nanotribological Printing (NTP) offers a versatile and accessible approach to nanoscale additive manufacturing.
    • The method allows for in situ monitoring and characterization of fabricated structures.
    • NTP's ability to create robust nanoscale patterns using standard AFM instruments opens new avenues in materials engineering.