Swelling properties and kinetics of CaCl2/polyacrylamide hygroscopic hybrid hydrogels

Xu, Sumei; Fan, Li; Zeng, Ming; Wang, Jing; Liu, Qing

doi:10.1016/j.colsurfa.2010.09.003

Cited by 20 publications

(5 citation statements)

References 32 publications

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“…The swelling kinetics of the PAM/CMC and GO/PAM/CMC composite hydrogels in deionized water was discussed by a Fickian and a Schott model, respectively. 47,63,64 Unfortunately, the entire swelling process did not exhibit Fickian behavior. The main reason is that for an extensive swelling system the diffusion coefficient obviously did not remain constant, which is the premise of Fickian law.…”

Section: Swelling Behaviors Of the Hydrogelsmentioning

confidence: 99%

Graphene oxide/polyacrylamide/carboxymethyl cellulose sodium nanocomposite hydrogel with enhanced mechanical strength: preparation, characterization and the swelling behavior

2014

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Section: Swelling Behaviors Of the Hydrogelsmentioning

confidence: 99%

Graphene oxide/polyacrylamide/carboxymethyl cellulose sodium nanocomposite hydrogel with enhanced mechanical strength: preparation, characterization and the swelling behavior

2014

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“…Different hygroscopic salts like lithium chloride (LiCl) and calcium chloride (CaCl 2 ) comes under the category of liquid desiccants 2 – 4 . These hygroscopic salts have very high water vapors adsorption capacities, but they have a deliquescence property in which they dissolve in the adsorbed water and form crystalline hydrates 5 , 6 . Therefore, these materials are very difficult to handle and have limited applications.…”

Section: Introductionmentioning

confidence: 99%

“…However, they have complex adsorption mechanism and in most of the cases, their dehumidification performance is unsatisfactory 13 . The composites of different polymers with hygroscopic salts were also synthesized to enhance their adsorption capacities 1 , 5 , 16 . In these composites, the main emphasis was given to avoid the dissolution of deliquescent salts by using the polymer as a matrix to keep the deliquescent salt intact.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, super-absorbent gels (SAHs) and their composites with various deliquescent salts have shown very promising results in capturing water from humid air 5 , 16 – 18 . SAHs are the crosslinked three dimensional polymers which adsorb water very fast and have swelling capacity upto 100 g w /g ads 19 , 20 .…”

Section: Introductionmentioning

confidence: 99%

“…In a study by Xu et al . 5 , polymer composites of SAHs with CaCl 2 salt were used to adsorb water vapors from moist air. In another study, the SAHs of N -isopropylacrylamide (NIPAM) were successfully applied to capture atmospheric water 17 .…”

Section: Introductionmentioning

confidence: 99%

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Capturing water vapors from atmospheric air using superporous gels

Mittal

Alili

Alhassan

2022

Sci Rep

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Dehumidification performance of most polymer desiccant materials is unsatisfactory because of the complex adsorption mechanism on polymer surface and non-porous structure. A viable alternative of solid desiccants, especially existing polymer desiccants, for capturing water vapors from moist air is the super-porous gels (SPGs). The presence of interconnected channels of pores in its structure facilitates the transfer of water molecules to the internal structure of SPGs. Therefore, in this research work, we are proposing N-isopropylacrylamide (NIPAM) and acrylamide (AM) based thermoresponsive SPGs as a potential alternative to the existing conventional solid desiccants. To ensure the formation of interconnected capillary channels, the SPGs were synthesized via gas blowing and foaming technique. Surface morphology of the SPGs was studied using scanning electron microscopy (SEM) and the other physio-chemical characteristics were studied using different techniques like fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and thermo-gravimetric analysis (TGA). Water vapors adsorption properties of the SPGs were explored via adsorption isotherm and kinetics. The adsorption isotherm was found to be of type-III isotherm with a maximum adsorption capacity of 0.75 gw/gads at 25 °C and 90% relative humidity. Experimental isotherm data correlated well with BET, FHH and GAB isotherm models. Adsorption kinetics suggested that the water vapors diffusion followed intraparticle diffusion and liquid field driving mechanisms collectively. SPGs exhibited very good regeneration and reusability for ten continuous adsorption/desorption cycles. Therefore, the dehumidification efficiency of synthesized SPGs shows that they have potential to replace most of the conventional solid desiccant materials in use.

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Development of high efficacy super-porous hydrogel composites-based polymer desiccants to capture water vapors from moist air

Mittal,

Al Alili,

Alhassan

2024

Adsorption

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Swelling properties and kinetics of CaCl2/polyacrylamide hygroscopic hybrid hydrogels

Cited by 20 publications

References 32 publications

Graphene oxide/polyacrylamide/carboxymethyl cellulose sodium nanocomposite hydrogel with enhanced mechanical strength: preparation, characterization and the swelling behavior

Graphene oxide/polyacrylamide/carboxymethyl cellulose sodium nanocomposite hydrogel with enhanced mechanical strength: preparation, characterization and the swelling behavior

Capturing water vapors from atmospheric air using superporous gels

Development of high efficacy super-porous hydrogel composites-based polymer desiccants to capture water vapors from moist air

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