2 research outputs found
Chemically Responsive Polymer Inverse-Opal Photonic Crystal Films Created by a Self-Assembly Method
The synthesis of poly-2-hydroxyethyl
methacrylate inverse-opal
hydrogel (IOHG<sub>PHEMA</sub>) was realized by capillary-force-induced
in situ polymerization in a polystyrene colloidal crystal template.
The created IOHG<sub>PHEMA</sub> films show brilliant blue-violet
color when they are immersed in deionized water and reach swelling
equilibrium. The stop band of the IOHG<sub>PHEMA</sub> films can be
tuned within the entire visible wavelength range by immersing them
into different chemical solutions, such as aldehydes, ketones, amides,
dimethyl sulfoxide, and alcohols. The extent of the reflective peak
shift not only depends on the number of hydrogen band donors but also
on the chain length and structure of the chemicals and their concentration.
Since the IOHG<sub>PHEMA</sub> films have different reflectance spectra
and structural colors in response to different compounds of the same
series, this provides a potential way to visually detect homologues
and other compounds with similar structure and properties. This simple,
yet effective, method also has the potential to be used generically
to determine approximate concentration of the solution by direct visual
observation of the color change
Cost-Effective Reduced Graphene Oxide-Coated Polyurethane Sponge As a Highly Efficient and Reusable Oil-Absorbent
Reduced graphene oxide coated polyurethane
(rGPU) sponges were fabricated by a facile method. The structure and
properties of these rGPU sponges were characterized by Fourier transform
infrared spectroscopy, thermal gravimetric analysis, X-ray diffraction,
and scanning electron microscopy. The rGPU sponges are hydrophobic
and oleophilic and show extremely high absorption for organic liquids.
For all the organic liquids tested, the absorption capacities were
higher than 80 g g<sup>–1</sup> and 160 g g<sup>–1</sup> (the highest value) was achieved for chloroform. In addition, the
absorption capacity of the rGPU sponge did not deteriorate after it
was reused 50 times, so the rGPU sponge has excellent recyclability