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Related Concept Videos

SDS-PAGE01:27

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Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
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Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
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Theory of Strong Electrolytes01:23

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The interionic forces of the strong electrolytes depend on the solvent's dielectric constant, which is the ability of a solvent to store electrical energy, based on its polarizability. and the solution's concentration. In high-dielectric solvents and in dilute solutions, weak electrostatic forces keep ions apart. However, in low-dielectric solvents or concentrated solutions, stronger interionic forces may cause ions to pair up as ionic doublets despite being fully ionized. The theory of strong...
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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Size-Exclusion Chromatography01:08

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In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
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Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
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Charge segregation in weakly ionized microgels.

John S Hyatt1, Alison M Douglas2, Chris Stanley3

  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.

Physical Review. E
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Summary
This summary is machine-generated.

Charged microgels undergo microphase separation at high temperatures. This results in a dense core and charged periphery, altering their structure and scattering properties.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • N-isopropylacrylamide (NIPAM) microgels are stimuli-responsive polymers.
  • Acrylic acid incorporation introduces pH-dependent swelling behavior.
  • Understanding microgel phase transitions is crucial for applications.

Purpose of the Study:

  • To investigate microphase separation in NIPAM-co-acrylic acid microgels.
  • To characterize structural changes due to competing swelling and deswelling forces.
  • To analyze scattering data and compare with theoretical models.

Main Methods:

  • Synthesis of NIPAM-co-acrylic acid microgels with high acrylic acid content.
  • Small-angle neutron scattering (SANS) to probe network structure.
  • Analysis of radius of gyration and hydrodynamic radius ratios.

Main Results:

  • Partial ionization of acrylic acid groups at high temperatures induces microphase separation.
  • Microgels exhibit a dense, deswollen core and a diffuse, charged periphery.
  • Scattering data reveals a distinct peak related to charge segregation in cross-linked systems.

Conclusions:

  • Competition between ion-induced swelling and hydrophobic deswelling drives microphase separation.
  • Structural changes are confirmed by a decreased radius of gyration to hydrodynamic radius ratio.
  • The observed behavior aligns with theoretical models for charged gels in poor solvents.