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Micelles

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Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Surface Active Agents

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Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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The interactions between cationic cellulose and Gemini surfactant in aqueous solution.

Shaojing Zhao1, Fa Cheng1, Yu Chen1

  • 1Department of Chemistry, Tianjin University, Tianjin 300072, PR China.

Carbohydrate Polymers
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Gemini surfactants interact more effectively with cationic cellulose than monovalent surfactants, forming a network structure that influences solution properties. This interaction suggests potential for stimuli-responsive drug delivery systems.

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Area of Science:

  • Materials Science
  • Colloid and Surface Chemistry
  • Polymer Science

Background:

  • Cationic cellulose finds extensive use in cosmetics, drug delivery, and gene therapy.
  • Understanding surfactant-cellulose complexes is crucial for optimizing their applications.
  • The molecular structure of surfactants significantly impacts their interaction with cationic cellulose.

Purpose of the Study:

  • To investigate the phase behavior, solution properties, and microstructure of Gemini surfactant/cationic cellulose mixtures.
  • To compare the interaction of a Gemini surfactant (9-4-9) with cationic cellulose (JR400) against its monovalent counterpart (9-2).
  • To explore the potential of these mixtures as stimuli-responsive drug delivery vectors.

Main Methods:

  • Turbidity measurements
  • Fluorescence spectrophotometry
  • Shear rheology
  • Dynamic light scattering (DLS)
  • Transmission electron microscopy (TEM)

Main Results:

  • Gemini surfactant (9-4-9)/cationic cellulose (JR400) mixtures exhibited significantly lower critical aggregation concentration (CAC) and critical micelle concentration (CMC) compared to monovalent surfactant (9-2)/JR400 mixtures.
  • Low concentrations of 9-4-9 induced substantial changes in micropolarity and viscosity, unlike the monovalent surfactant.
  • DLS and TEM revealed the formation and collapse of a network structure in the 9-4-9/JR400 mixture, correlating with viscosity changes.

Conclusions:

  • The molecular structure of surfactants plays a critical role in their interaction with cationic cellulose.
  • Gemini surfactant/cationic cellulose mixtures demonstrate potential as stimuli-responsive drug delivery systems capable of carrying both hydrophilic and hydrophobic substances.