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Abstract: Hydrogels with multi-environmental tolerance have received widespread attention and are expected to be used as smart materials in a variety of environments (for example, water, oil, freezing and drying)
.
However, the macroscopic changes and anti-swelling mechanism of organic hydrogels in different solvents and their corresponding applications have not been fully utilized
.
Recently, the team of Associate Researcher Chen Yujie/Associate Researcher Li Hua of Shanghai Jiaotong University has prepared ionic organic hydrogels with excellent mechanical properties and unique behaviors (information recognition and encryption) and mechanical sensing in a variety of environments
.
The prepared organic hydrogels show obvious transparent changes in different solvents due to microphase separation in poor solvents and swelling in appropriate solvents, and can be regarded as dynamic information storage for recording and encrypting information Device
.
In addition, due to the interaction between water and dimethyl sulfoxide (DMSO), organic hydrogels show remarkable freezing resistance (-90 to 20°C) and moisture retention (76% after 15 days)
.
In addition, ion conductive hydrogels show excellent human motion detection and physiological signal response in freezing, drying conditions and oil or water environments, and show stable mechanical sensing performance
.
It is foreseeable that the design strategy and mechanism research of organic hydrogels may be expected to be used as biosensors and information recognition platforms in harsh environments
.
Related papers are published on Advanced Functional Materials with the title Ionic Conductive Organohydrogels with Dynamic Pattern Behavior and Multi-Environmental Stability
.
[Main image] Figure 1?a) Schematic diagram of the structure of the prepared organic hydrogel
.
b) A diagram of the mechanism and properties of organic hydrogels
.
Figure 2?a) The transmittance of UV light changes from transparency to opacity, and returns to the 5:5 transparency of the gel (blue means soaking in water, pink means soaking in DMSO)
.
b) The relationship between immersion time in water and DMSO
.
c) 5:5 Raman shift spectra of the gel before and after immersion in water
.
d) The optical image of the sample changes from transparent to opaque, and then becomes transparent in water and DMSO
.
e) The transparency-opacity-transparency cycle of gel 5:5 in water and DMSO
.
f) In the mixed solution of DMSO and water, the 5:5 transmittance change rate of the gel is different, where W represents water and D represents DMSO
.
g) The transmittance change of gel 5:5 in different solutions
.
Figure 3?a) Schematic diagram of information loading and unloading by water writing and DMSO erasing
.
b) Optical images of different patterns drawn on gel 5:5 written by water
.
c) The optical image shows the process of rubbing the letters "SJTU" on the surface of the 5:5 gel with DMSO solution
.
d) Schematic diagram of information encryption and decoding methods through water and DMSO solutions
.
e) The optical image of mode "8" using water encryption can be easily displayed and self-erased using DMSO
.
Figure 4 Mechanical properties of the prepared organic hydrogel
.
Figure 5 The mechanical sensitivity of gel 5:5
.
.
However, the macroscopic changes and anti-swelling mechanism of organic hydrogels in different solvents and their corresponding applications have not been fully utilized
.
Recently, the team of Associate Researcher Chen Yujie/Associate Researcher Li Hua of Shanghai Jiaotong University has prepared ionic organic hydrogels with excellent mechanical properties and unique behaviors (information recognition and encryption) and mechanical sensing in a variety of environments
.
The prepared organic hydrogels show obvious transparent changes in different solvents due to microphase separation in poor solvents and swelling in appropriate solvents, and can be regarded as dynamic information storage for recording and encrypting information Device
.
In addition, due to the interaction between water and dimethyl sulfoxide (DMSO), organic hydrogels show remarkable freezing resistance (-90 to 20°C) and moisture retention (76% after 15 days)
.
In addition, ion conductive hydrogels show excellent human motion detection and physiological signal response in freezing, drying conditions and oil or water environments, and show stable mechanical sensing performance
.
It is foreseeable that the design strategy and mechanism research of organic hydrogels may be expected to be used as biosensors and information recognition platforms in harsh environments
.
Related papers are published on Advanced Functional Materials with the title Ionic Conductive Organohydrogels with Dynamic Pattern Behavior and Multi-Environmental Stability
.
[Main image] Figure 1?a) Schematic diagram of the structure of the prepared organic hydrogel
.
b) A diagram of the mechanism and properties of organic hydrogels
.
Figure 2?a) The transmittance of UV light changes from transparency to opacity, and returns to the 5:5 transparency of the gel (blue means soaking in water, pink means soaking in DMSO)
.
b) The relationship between immersion time in water and DMSO
.
c) 5:5 Raman shift spectra of the gel before and after immersion in water
.
d) The optical image of the sample changes from transparent to opaque, and then becomes transparent in water and DMSO
.
e) The transparency-opacity-transparency cycle of gel 5:5 in water and DMSO
.
f) In the mixed solution of DMSO and water, the 5:5 transmittance change rate of the gel is different, where W represents water and D represents DMSO
.
g) The transmittance change of gel 5:5 in different solutions
.
Figure 3?a) Schematic diagram of information loading and unloading by water writing and DMSO erasing
.
b) Optical images of different patterns drawn on gel 5:5 written by water
.
c) The optical image shows the process of rubbing the letters "SJTU" on the surface of the 5:5 gel with DMSO solution
.
d) Schematic diagram of information encryption and decoding methods through water and DMSO solutions
.
e) The optical image of mode "8" using water encryption can be easily displayed and self-erased using DMSO
.
Figure 4 Mechanical properties of the prepared organic hydrogel
.
Figure 5 The mechanical sensitivity of gel 5:5
.