Related Experiment Video
Updated: Jan 11, 2026
Printing Thermoresponsive Reverse Molds for the Creation of Patterned Two-component Hydrogels for 3D Cell Culture
Published on: July 10, 2013
Facile Access to Salt-Resistant Polyzwitterionic Hydrogel Evaporator via In Situ Frontal Curing-3D Printing Strategy
Ya-Lan Zhao1, Jia-Le Lu1, Yong-Chun Hou1
1State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering and Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer Materials, Nanjing Tech University, Nanjing, 210009, P. R. China.
A novel polyzwitterionic hydrogel, created using in situ frontal curing-3D printing, efficiently produces freshwater from saltwater. This advanced hydrogel evaporator demonstrates excellent salt tolerance and high evaporation rates, addressing the global freshwater crisis.
Area of Science:
- Materials Science
- Chemical Engineering
- Environmental Science
Background:
- The escalating global freshwater crisis necessitates advanced materials for efficient desalination and water production.
- Existing methods often struggle with salt tolerance and energy efficiency in evaporation-based freshwater generation.
Purpose of the Study:
- To design and fabricate a highly salt-tolerant and efficient hydrogel evaporator for freshwater production.
- To develop a facile and energy-saving fabrication strategy for advanced hydrogel evaporators.
Main Methods:
- An in situ frontal curing-3D printing strategy was employed to create polyzwitterionic hydrogels.
- The hydrogel's properties, including anti-polyelectrolyte effect, boosted hydration, and water transport, were investigated.
- Evaporation performance was evaluated using high-concentration NaCl solutions.
Main Results:
- The fabricated polyzwitterionic hydrogel exhibited an anti-polyelectrolyte effect and enhanced hydration, leading to a higher intermediate water/free water ratio and lower evaporation enthalpy.
- Synergistic water transport was achieved through macro-channels from 3D printing and inherent microchannels within the hydrogel.
- An exceptional evaporation rate of 4.02 kg·m⁻²·h⁻¹ was recorded in 15 wt.% NaCl solution, demonstrating excellent salt tolerance.
Conclusions:
- The in situ frontal curing-3D printing strategy offers a time- and energy-efficient method for producing high-performance hydrogel evaporators.
- The developed polyzwitterionic hydrogel evaporator shows significant promise for addressing the global freshwater shortage due to its high efficiency and salt tolerance.
- This work provides a facile approach for developing advanced hydrogel evaporators for practical freshwater production applications.
