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Recently, the research team of the Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, based on the coupling effect of interface lubrication and mechanical deformation, developed an intelligent esophageal gel-like soft substance device, which has a firm water surface on the surface of the gel tube.
With the aid of the lubricating layer, the hydrodynamic pressure and mechanical driving force generated by the contraction and deformation of the lumen realize the on-demand transportation of solids in multiple directions
.
The directional transmission of objects (liquid and solid) has important applications in the fields of energy transmission, intelligent robots, and biomedical equipment
.
In the past 20 years, the study of directional liquid transport has attracted wide attention from scientists and made important breakthroughs
Different from the liquid directional transport mechanism, the solid directional transport under confined pressure needs to rely on a strong mechanical driving force to overcome the friction force in the elastic deformation contact process, and good interfacial lubrication is a prerequisite
.
In nature, under the lubrication of the mucus secreted by the tissue cavity, the esophagus can use the mechanical peristaltic waves generated by muscle stress to achieve the successful transmission of large food masses
.
Inspired by this, the researchers based on the previously proposed surface catalyzed initiation of free radical polymerization method, using iron wire as the catalytic template, prepared an iron-based double network high-strength temperature-sensitive hydrogel tube containing ATRP active initiator; using the previous development Subsurface initiated free radical polymerization methodology.
After the prepared gel tube device is locally irradiated by the near-infrared laser, the inner surface can still maintain a low friction state, and the cavity produces instantaneous volume shrinkage
.
This volume contraction enables the tubular device to generate sufficient hydrodynamic pressure and large mechanical driving force.
The research uses novel bionic design concepts, surface chemistry and soft material mechanics coupling to realize the directional transport of solids in a three-dimensional lumen environment under confined pressure conditions in any direction.
