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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Potential Due to a Polarized Object01:29

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties
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Colored polystyrene particles with a surface charge influenced by suspension polymerization.

Woo Jin Yim, Ki Chang Lee, Sang Yong Nam

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    Blue polystyrene particles were synthesized by copolymerizing styrene with poly(ethylene glycol) ether methyl methacrylate (PEG-MA) via suspension polymerization. The resulting particles exhibit controlled sizes and properties, suitable for various applications.

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    Area of Science:

    • Polymer Chemistry
    • Materials Science
    • Nanotechnology

    Background:

    • Polystyrene (PS) particles are widely used in various applications.
    • Copolymerization offers a route to tune particle properties.
    • Poly(ethylene glycol) ether methyl methacrylate (PEG-MA) can impart unique characteristics to polymers.

    Purpose of the Study:

    • To synthesize blue polystyrene particles copolymerized with varying amounts of PEG-MA.
    • To characterize the synthesized poly[styrene-co-(PEG-MA)] particles.
    • To confirm successful copolymerization and assess particle properties.

    Main Methods:

    • Suspension polymerization of styrene and PEG-MA (Mn = 300, 475, 950).
    • Characterization using Scanning Electron Microscopy (SEM), Infrared (IR) spectroscopy, UV-Vis spectroscopy, Differential Scanning Calorimetry (DSC), and zeta potential measurements.
    • Solubility tests in Tetrahydrofuran (THF).

    Main Results:

    • Copolymerization was confirmed through IR spectroscopy, DSC, and THF solubility tests.
    • The poly[styrene-co-(PEG-MA)] latices ranged from 30-60 nm in size.
    • Key properties included glass transition temperatures (T(g)) of 341-385 K, zeta potentials of 51.5-162 mV, and electrophoretic mobility of 3.3-10.9 x 10(-6) cm2/Vs.
    • Blue dye incorporation exceeded 85% based on UV absorbance.

    Conclusions:

    • Successful synthesis of blue polystyrene-PEG-MA copolymer particles was achieved.
    • The properties of the particles, including size, T(g), and surface charge, can be tuned by adjusting PEG-MA content.
    • The results indicate the potential of these copolymer particles for applications requiring specific surface properties and dye incorporation.