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Aldol Condensation vs Claisen Condensation01:33

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Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...
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3D-printed micro-optical dark-field condenser.

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    Researchers developed a compact, 3D-printed dark-field condenser for microscopy. This miniaturized device enhances image contrast and resolution for nanoscale samples, enabling advanced imaging in biology and medicine.

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    Area of Science:

    • Optical microscopy
    • Nanotechnology
    • 3D printing

    Background:

    • Dark-field microscopy is crucial for high-contrast imaging of transparent and nanoscale samples.
    • Conventional dark-field microscopy setups are often bulky and expensive.
    • Miniaturization is key for broader accessibility in scientific research.

    Purpose of the Study:

    • To demonstrate a miniaturized, 3D-printed dark-field condenser.
    • To achieve high-performance dark-field imaging with a compact device.
    • To enable rapid prototyping of advanced microscopy techniques.

    Main Methods:

    • Fabrication of a millimeter-sized dark-field condenser using femtosecond two-photon polymerization 3D-printing.
    • Integration of an annular absorbing aperture and a high-numerical aperture lens on a glass substrate.
    • Utilizing oblique illumination for dark-field imaging.

    Main Results:

    • Successful demonstration of excellent dark-field performance.
    • Imaging of USAF 1951 resolution test charts.
    • Resolution of gold disks with diameters below 500 nm achieved.

    Conclusions:

    • The 3D-printed dark-field condenser offers a miniaturized and effective solution for advanced microscopy.
    • This technology enables rapid prototyping for applications in medicine and biology, such as microfluidic chips.
    • Paves the way for entirely 3D-printed microscopes with enhanced dark-field capabilities.