A Hydroscopic Indium Hydrogel Capturing Atmospheric Humidity for Autonomous Agriculture

Zhao, Jing; Xiong, Yuli; Wu, Hangfei; Xi, Mufeng; Liang, Hong; Guo, Shuai; Yang, Lin; Tan, Swee Ching

doi:10.1002/solr.202300414

Cited by 7 publications

(2 citation statements)

References 40 publications

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“…The MIL-101(Cr) was synthesized by hydrothermal method following a literature procedure [46]. MIL-101(Cr)/LiCl was obtained by post-synthesis method following a literature procedure [18]. In brief, a specified quality of LiCl (3 mg/mL) was poured into a pre-dispersed MIL-101(Cr) aqueous suspension (5 mg/mL).…”

Section: Synthesismentioning

confidence: 99%

“…However, challenges arise during the water absorption process, including salt solution leakage, particle crystallization and agglomeration, and excessive energy consumption for regeneration [13][14][15]. To address these issues, a commonly employed approach involves embedding salt into porous materials, where the matrix functions as a container to load deliquescent salts [16][17][18][19]. Nevertheless, widely used porous composites like silica gel [16], zeolites [20,21], carbon nanospheres [22], metal-organic frameworks (MOFs) [23,24], POPs [25,26], and COFs [27][28][29] often exhibit unsatisfactory performances due to their limited pore volume [30].…”

Section: Introductionmentioning

confidence: 99%

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A Polyzwitterionic@MOF Hydrogel with Exceptionally High Water Vapor Uptake for Efficient Atmospheric Water Harvesting

Yan,

Li,

et al. 2024

Molecules

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Atmospheric water harvesting (AWH) is considered a promising strategy for sustainable freshwater production in landlocked and arid regions. Hygroscopic salt-based composite sorbents have attracted widespread attention for their water harvesting performance, but suffer from aggregation and leakage issues due to the salting-out effect. In this study, we synthesized a PML hydrogel composite by incorporating zwitterionic hydrogel (PDMAPS) and MIL-101(Cr) as a host for LiCl. The PML hydrogel was characterized using various techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR), and thermogravimetric analysis (TGA). The swelling properties and water vapor adsorption-desorption properties of the PML hydrogel were also assessed. The results demonstrate that the MIL-101(Cr) was uniformly embedded into PDMAP hydrogel, and the PML hydrogel exhibits a swelling ratio of 2.29 due to the salting-in behavior. The PML hydrogel exhibited exceptional water vapor sorption capacity of 0.614 g/g at 298 K, RH = 40% and 1.827 g/g at 298 K, RH = 90%. It reached 80% of its saturated adsorption capacity within 117 and 149 min at 298 K, RH = 30% and 90%, respectively. Additionally, the PML hydrogel showed excellent reversibility in terms of water vapor adsorption after ten consecutive cycles of adsorption-desorption. The remarkable adsorption capacity, favorable adsorption-desorption rate, and regeneration stability make the PML hydrogel a potential candidate for AWH. This polymer-MOF synergistic strategy for immobilization of LiCl in this work offers new insights into designing advanced materials for AWH.

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Section: Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Polyzwitterionic@MOF Hydrogel with Exceptionally High Water Vapor Uptake for Efficient Atmospheric Water Harvesting

Yan,

Li,

et al. 2024

Molecules

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Nanoporous Silica Lattice Coated with LiCl@PHEA for Continuous Water Harvesting from Atmospheric Humidity

Xu,

Liu,

Xian

et al. 2024

Adv Funct Materials

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Recently, atmospheric water harvesting (AWH) based on hygroscopic salt on an inorganic or organic carrier has attracted great attention because of its significant potential applications in the environment. The major technical challenges for practical applications are how to prevent the leakage of hygroscopic salt while achieving a high capacity for sorption of atmospheric water and a high sorption rate. Additionally, techniques for converting sorbed water (in the form of a lithium chloride (LiCl) solution) into clean water need to be developed. Here, a novel method for continuous atmospheric water harvesting, leveraging LiCl@PHEA hydrogels is introduced. Synthesized via one‐step UV polymerization in saturated LiCl solutions, these hydrogels exhibit remarkable air distension ability (>60 times), achieving high water sorption efficiency (11.18 gg−1 at 90% relative humidity in 30 min) with over 90 wt.% salt content and no leakage. This water collection system integrates a porous evaporator and a 3D‐printed silica substrate, ensuring an extraordinarily high evaporation rate (>11 kgm−2 h−1 under sunlight) and efficient water transmission. A prototype based on this achieves a record‐breaking collection rate of over 5 kgm−2 h−1, enabling large‐scale efficient atmospheric water harvesting. Additionally, continuous hydrogen production through electrolysis using the collected water (< 5 ppm of salts) is demonstrated.

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Cobalt‐Ion Superhygroscopic Hydrogels Serve as Chip Heat Sinks Achieving a 5 °C Temperature Reduction via Evaporative Cooling

Xi,

Zhang,

Liu

et al. 2024

Small Methods

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In the rapidly advancing semiconductor sector, thermal management of chips remains a pivotal concern. Inherent heat generation during their operation can lead to a range of issues such as potential thermal runaway, diminished lifespan, and current leakage. To mitigate these challenges, the study introduces a superhygroscopic hydrogel embedded with metal ions. Capitalizing on intrinsic coordination chemistry, the metallic ions in the hydrogel form robust coordination structures with non‐metallic nitrogen and oxygen through empty electron orbitals and lone electron pairs. This unique structure serves as an active site for water adsorption, beginning with a primary layer of chemisorbed water molecules and subsequently facilitating multi‐layer physisorption via Van der Waals forces. Remarkably, the cobalt‐integrated hydrogel demonstrates the capability to harvest over 1 and 5 g g−1 atmospheric water at 60% RH and 95% RH, respectively. Furthermore, the hydrogel efficiently releases the entirety of its absorbed water at a modest 40°C, enabling its recyclability. Owing to its significant water absorption capacity and minimal dehydration temperature, the hydrogel can reduce chip temperatures by 5°C during the dehydration process, offering a sustainable solution to thermal management in electronics.

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A Hydroscopic Indium Hydrogel Capturing Atmospheric Humidity for Autonomous Agriculture

Cited by 7 publications

References 40 publications

A Polyzwitterionic@MOF Hydrogel with Exceptionally High Water Vapor Uptake for Efficient Atmospheric Water Harvesting

A Polyzwitterionic@MOF Hydrogel with Exceptionally High Water Vapor Uptake for Efficient Atmospheric Water Harvesting

Nanoporous Silica Lattice Coated with LiCl@PHEA for Continuous Water Harvesting from Atmospheric Humidity

Cobalt‐Ion Superhygroscopic Hydrogels Serve as Chip Heat Sinks Achieving a 5 °C Temperature Reduction via Evaporative Cooling

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