Organogels (hydrophobic polymer gels) are soft materials based on polymeric networks swollen in organic solvents. They are hydrophobic and possess a high content of solvent and low surface adhesion, rendering them interesting in applications such as encapsulants, drug delivery, actuators, slippery surfaces (self-cleaning, anti-waxing, anti-bacterial), or for oil-water separation. To design functional organogels, strategies to control their shape and surface structure are required. Herein, the inherent UV photodegradability of poly(methacrylate) organogels is reported. No additional photosensitizers are required to efficiently degrade organogels (d ≈ 1 mm) on the minute scale. A low UV absorbance and a high swelling ability of the solvent infusing the organogel are found to be beneficial for fast photodegradation, which is expected to be transferrable to other gel photochemistry. Organogel arrays, films, and structured organogel surfaces are prepared, and their extraction ability and slippery properties are examined. Films of inherently photodegradable organogels on copper circuit boards serve as the first ever positive gel photoresist. Spatially photodegraded organogel films protect or reveal copper surfaces against an etchant (FeCl 3 aq. ).
Conductive polymers have been intensively
investigated as materials for electrodes in flexible electronics due
to their favorable biocompatibility and reliable electrochemical stability.
Nevertheless, patterning of conductive polymers for the fabrication
of devices and in various electronics applications confronts multifarious
limitations and challenges. Here, we present a simple but efficient
strategy to obtain conductive polymer microelectrodes via utilization
of surface-tension-confined liquid patterns. This method shows universality
for various oxidizers and conductive polymers, high resolution, stability,
and favorable compatibility with different surfaces and materials.
The developed method has been demonstrated for creating conductive
polymer microelectrodes with a customized reaction process, defined
geometry, and flexible substrates. The obtained microelectrodes were
assembled into flexible capacitive sensors. Thus, the method realizes
a facile approach to conductive polymer microelectrodes for flexible
electronics, biomedical applications, human activity monitors, and
electronic
skin.
We study the relationship between the PDEA content and internalization/intracellular drug release of pH responsive phosphorylcholine micelles as drug carriers.
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