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Oppositely Charged, Stimuli-Responsive Anisotropic Nanoparticles for Colloidal Self-Assembly.
Eun Young Hwang1, Jae Sang Lee1, Dong Woo Lim1
1Department of Bionano Engineering and Bionanotechnology, College of Engineering Sciences , Hanyang University , Ansan , Republic of Korea.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 6, 2019
Summary
Researchers created advanced anisotropic nanoparticles (ANPs) with two compartments using electrohydrodynamic cojetting. These ANPs self-assemble into functional nanostructures, offering tunable properties for applications like drug delivery and switchable displays.
Area of Science:
- Materials Science
- Polymer Chemistry
- Nanotechnology
Background:
- Anisotropic nanoparticles (ANPs) with distinct compartments offer tunable physicochemical properties.
- Colloidal self-assembly of ANPs can yield superstructures with enhanced functionality.
Purpose of the Study:
- To prepare and characterize two-compartment ANPs with oppositely charged and thermally responsive ternary copolymers.
- To investigate the colloidal self-assembly behavior and stimuli-responsive properties of these ANPs.
Main Methods:
- Electrohydrodynamic cojetting was employed to synthesize ANPs.
- The ANPs comprised positively charged poly(N-isopropylacrylamide-co-stearyl acrylate-co-allylamine) and negatively charged poly(N-isopropylacrylamide-co-stearyl acrylate-co-acrylic acid) compartments.
- Physical cross-linking via hydrophobic interactions and self-assembly via electrostatic interactions were utilized.
Main Results:
- The ANPs self-assembled into supracolloidal nanostructures in aqueous solution.
- Colloidal self-assembly and thermal responsiveness were effectively controlled by compartment charge density and solution ionic strength.
- The resulting nanostructures exhibited both intrinsic temperature-responsive behavior and collective properties derived from self-assembly.
Conclusions:
- Multifunctional, stimuli-responsive nanostructures were successfully fabricated.
- These nanostructures demonstrate potential for applications in switchable displays, drug delivery carriers, and ion-sensitive gels.
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