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Related Concept Videos

Ion Exchange01:17

Ion Exchange

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 basic...

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Updated: Jun 5, 2026

Preparation of Functional Silica Using a Bioinspired Method
08:04

Preparation of Functional Silica Using a Bioinspired Method

Published on: August 1, 2018

Anionic-cationic switchable amphoteric monodisperse mesoporous silica nanoparticles.

Yanhang Ma1, Lei Xing, Haoquan Zheng

  • 1School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 21, 2010
PubMed
Summary
This summary is machine-generated.

Synthesized switchable silica nanoparticles possess tunable dispersity and reversibility. These pH-responsive materials enable controllable aqueous dispersion and reutilization by adjusting electrostatic interactions.

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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Mesoporous silica nanoparticles (MSNs) are widely used in various applications due to their high surface area and tunable pore structure.
  • Controlling the dispersity and stability of MSNs in aqueous solutions, especially under varying pH conditions, remains a challenge.
  • Developing stimuli-responsive nanomaterials with reversible properties is crucial for advanced applications.

Purpose of the Study:

  • To synthesize monodisperse mesoporous silica nanoparticles with anionic-cationic switchable properties.
  • To investigate the pH-responsive behavior and controllable dispersity of these novel nanoparticles.
  • To demonstrate the potential for reutilization and tunable electrostatic interactions in aqueous media.

Main Methods:

  • One-pot synthesis involving surfactant self-assembly, co-structure-directing agents with amino and carboxylic groups, and silica sources.
  • Characterization of nanoparticle properties, including size, morphology, and surface charge.
  • Evaluation of pH-responsive switchability and dispersity in aqueous solutions.
  • Demonstration of controlled reutilization through manipulation of electrostatic forces.

Main Results:

  • Successfully synthesized monodisperse mesoporous silica nanoparticles with anionic-cationic switchability.
  • Demonstrated reversible pH-responsive behavior, enabling tunable dispersity in aqueous solutions.
  • Showcased the ability to control particle aggregation and dispersion by adjusting electrostatic interactions.
  • Confirmed the potential for material reutilization through the switching mechanism.

Conclusions:

  • Anionic-cationic switchable mesoporous silica nanoparticles offer a novel platform for pH-responsive material design.
  • The developed synthesis method provides a versatile route to stimuli-responsive nanomaterials.
  • These nanoparticles exhibit controllable dispersity and can be effectively reused, opening avenues for applications in drug delivery, catalysis, and sensing.