Related Experiment Video
Updated: Jun 17, 2026
08:01
Fabrication of Zero Mode Waveguides for High Concentration Single Molecule Microscopy
Published on: May 12, 2020
Microscopic composition maps of poly(styrene-co-2-hydroxyethyl methacrylate) colloidal crystals and interconnected
Dongqi Qin1, Guoda Lian, Shuhui Qin
1Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
Langmuir : the ACS Journal of Surfaces and Colloids
|December 24, 2009
Summary
Researchers transformed colloidal crystalline films into honeycomb-like structures using styrene vapor. This process, dependent on temperature, altered surface chemistry, creating distinct ridges and dimples with unique elemental distributions.
Area of Science:
- Materials Science
- Polymer Chemistry
- Surface Science
Background:
- Colloidal crystals (CCs) offer ordered structures but can lack surface functionality.
- Poly(styrene-co-2-hydroxyethyl methacrylate) (PS-HEMA) latex particles are versatile building blocks for advanced materials.
Purpose of the Study:
- To investigate the transformation of PS-HEMA colloidal crystals into interconnected colloidal arrays (ICAs).
- To analyze the structural and chemical changes during this transformation and understand the underlying mechanism.
Main Methods:
- Evaporative deposition of PS-HEMA latex particles to form CCs.
- Surface modification using styrene vapor at controlled temperatures.
- Characterization using Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), and Energy Dispersive Spectroscopy (EDS).
Main Results:
- CCs transformed into honeycomb-like ICAs with raspberry-textured surfaces.
- ICA structural regularity decreased with increasing styrene vapor temperature.
- EDS analysis revealed distinct elemental distributions on ICA ridges (O, S, Na, K) and dimples.
Conclusions:
- Styrene vapor induces a surface restructuring mechanism, swelling polystyrene domains and concentrating them on ridges.
- PolyHEMA-rich domains maintain periodicity, guiding the formation of ordered dimples.
- The temperature-dependent transformation allows for tunable surface chemistry in colloidal arrays.
Related Concept Videos
01:29The Colloidal State
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
03:22Colloids
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
01:09Colloidal precipitates
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
01:21Polymer Classification: Crystallinity
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...