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Adsorption and Denaturation of Structured Polymeric Nanoparticles at an Interface
Chang Tian1, Jie Feng1, H Jeremy Cho1
1Department of Chemical and Biological Engineering , Princeton University , Princeton , New Jersey 08544 , United States.
Nano Letters
|July 6, 2018
Summary
This study reveals three distinct stages of nanoparticle (NP) adsorption at air-liquid interfaces, including a novel restructuring phase. Understanding these NP adsorption dynamics is crucial for applications like drug delivery.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Nanoparticles (NPs) are vital in energy, environment, and health applications.
- NP adsorption at interfaces is poorly understood, hindering applications like drug delivery.
- Structured NPs with hydrophilic coronas and hydrophobic cores present unique interfacial behaviors.
Purpose of the Study:
- To investigate the kinetics and structural evolution of NP adsorption at air-liquid interfaces.
- To quantify NP attachment dynamics over time scales from milliseconds to seconds.
- To identify and characterize distinct stages of NP interfacial adsorption.
Main Methods:
- Observation of NP aggregation in dispersions exposed to air-liquid interfaces.
- Time-resolved investigation of NP attachment and structural changes.
- Quantitative modeling to determine diffusion coefficients, adsorption rates, and core exposure.
Main Results:
- Identified three distinct stages of NP adsorption: free diffusion, steric barriers, and a novel interfacial restructuring phase.
- Quantified NP adsorption kinetics, including diffusion, adsorption rates, and barriers.
- Characterized the extent of hydrophobic core exposure during NP restructuring at the interface.
Conclusions:
- The study elucidates NP adsorption dynamics at interfaces, revealing a previously unrecognized restructuring stage.
- Findings enhance fundamental understanding of how structured NPs interact with interfaces.
- This knowledge is critical for optimizing NP-based technologies, particularly in targeted drug delivery.
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