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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by...
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Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.
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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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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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    Area of Science:

    • Spectroscopy and Microscopy
    • Materials Science
    • Chemical Imaging

    Background:

    • Infrared scattering scanning near-field optical microscopy (IR s-SNOM) offers nanometer spatial resolution for spectroscopic imaging.
    • Full spatio-spectral imaging with IR s-SNOM is limited by prolonged measurement durations.

    Purpose of the Study:

    • To demonstrate the application of compressed sensing algorithms for accelerating hyperspectral nano-imaging.
    • To achieve faster imaging speeds for Fourier Transform Infrared (FTIR)-based nano-imaging without compromising spectral content.

    Main Methods:

    • Application of compressed sensing algorithms to IR s-SNOM data acquisition.
    • Utilizing prior knowledge of the sparseness of Fourier base functions and sub-sampling strategies.
    • Spectroscopic analysis of a single vibrational resonance as a model system.

    Main Results:

    • Achieved an order of magnitude increase in imaging speed for hyperspectral nano-imaging compared to conventional methods.
    • Demonstrated the feasibility of compressed sensing for FTIR-based nano-imaging.
    • Established the relationship between prior knowledge of sparseness and sub-sampling efficiency.

    Conclusions:

    • Compressed sensing significantly enhances the speed of nano-FTIR spectroscopy.
    • This technique enables rapid and sensitive chemical nano-imaging.
    • The method is highly relevant for academic and industrial applications in nano- and bio-materials research.