Effect of hygroscopic materials on water vapor permeation and dehumidification performance of poly(vinyl alcohol) membranes

Bui, Tammy; Wong, Yoke San; Thu, Kyaw; Oh, Seung Jin; Kumja, M.; Ng, Kim Choon; Raisul, I.; Chua, Kian Jon

doi:10.1002/app.44765

Cited by 53 publications

(17 citation statements)

References 42 publications

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“…In this respect, some strategies were introduced as solutions to prevent the evaporation of water molecules. The use of hygroscopic materials such as ethylene glycol, glycerol, sugar, salts like lithium chloride and sodium chloride has imparted moisture holding capacity into the hydrogels. In addition, an elastomeric coating on the hydrogels can prohibit the evaporation of water …”

Section: Self‐healable Ionic Tactile Sensorsmentioning

confidence: 99%

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

Amoli

Kim

et al. 2019

Adv Funct Materials

153

119

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Ionic tactile sensors (ITS) represent a new class of deformable sensory platforms that mimic not only the tactile functions and topological structures but also the mechanotransduction mechanism across the biological ion channels in human skin, which can demonstrate a more advanced biological interface for targeting emerging human-interactive technologies compared to conventional e-skin devices. Recently, flexible and even stretchable ITS have been developed using novel structural designs and strategies in materials and devices. These skin-like tactile sensors can effectively sense pressure, strain, shear, torsion, and other external stimuli with high sensitivity, high reliability, and rapid response beyond those of human perception. In this review, the recent developments of the ITS based on the novel concepts, structural designs, and strategies in materials innovation are entirely highlighted. In particular, biomimetic approaches have led to the development of the ITS that extend beyond the tactile sensory capabilities of human skin such as sensitivity, pressure detection range, and multimodality. Furthermore, the recent progress in self-powered and self-healable ITS, which should be strongly required to allow human-interactive artificial sensory platforms is reviewed. The applications of ITS in human-interactive technologies including artificial skin, wearable medical devices, and user-interactive interfaces are highlighted. Last, perspectives on the current challenges and the future directions of this field are presented.

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Section: Self‐healable Ionic Tactile Sensorsmentioning

confidence: 99%

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

Amoli

Kim

et al. 2019

Adv Funct Materials

153

119

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“…The separation characteristics of an isopropyl alcohol/water azeotrope using evapomeation and temperaturedifference controlling evapomeation methods with PVA/NaY membranes , International Journal of Environment and Geoinformatics (IJEGEO), 8(3): 344-349. doi.10.30897/ijegeo. 881056 stability in aqueous solutions compared to other hydrophilic polymers (Bui et al, 2017;Kwon et al, 2018). In this way, it is worthwhile to improve the required mechanical properties and selective water permeability of PVA membranes by blending it with NaY zeolite.…”

Section: Research Articlementioning

confidence: 99%

The Separation Characteristics of an Isopropyl Alcohol/water Azeotrope Using Evapomeation and Temperature-difference Controlling Evapomeation Methods with PVA/NaY Membranes

Kurşun

2021

International Journal of Environment and Geoinformatics

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This study investigated the permeation and separation characteristics during the evapomeation and temperature-difference controlling evapomeation (TDEV) of an isopropyl alcohol/water (IPA/water) azeotrope through poly(vinyl alcohol)/NaY (PVA/NaY) membranes. The effects of the operational temperature and the feed concentration on the membrane separation factor and flux values were investigated for evapomeation and TDEV. The permeation and diffusion activation energies for an IPA/water mixture through a PVA/NaY membrane were calculated to be 23.69 and 41.61 kJ/mol, respectively. The results for the PVA and PVA/NaY membranes were supported by swelling behaviors. The best separation factor obtained was 2097.38 using the evapomeation method and 2483.75 using the TDEV method.

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“…4 Substantial efforts to develop suitable highly permselective polymeric [17][18][19][20][21][22], inorganic [14,19,23], liquid [24,25] and mixed matrix [26,27] membranes have been explored. However, precisely how membrane permeance and selectivity affect the COP of VMD remains to be elucidated,…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A thermodynamic perspective to study energy performance of vacuum-based membrane dehumidification

Bui

Kumja

Gordon

et al. 2017

Energy

Self Cite

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In humid environments, decoupling the latent and sensible cooling loads-dehumidifying-can significantly improve chiller efficiency. Here, a basic limit for dehumidification efficiency is established from fundamental thermodynamics. This is followed by the derivation of how this limit is modified when the pragmatic constraint of a finite flux must be accommodated. These limits allow one to identify promising system modifications, and to quantify their impact. The focus is on vacuum-based membrane dehumidification. New high-efficiency configurations are formulated, most notably, by coupling pumping with condensation. More than an order-of-magnitude improvement in efficiency is achievable. It is contingent on water vapor exiting at its saturation pressure rather than at ambient pressure. Sensitivity studies to recovery ratio, temperature, relative humidity and membrane selectivity are also presented.

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Effect of hygroscopic materials on water vapor permeation and dehumidification performance of poly(vinyl alcohol) membranes

Cited by 53 publications

References 42 publications

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

Ionic Tactile Sensors for Emerging Human‐Interactive Technologies: A Review of Recent Progress

The Separation Characteristics of an Isopropyl Alcohol/water Azeotrope Using Evapomeation and Temperature-difference Controlling Evapomeation Methods with PVA/NaY Membranes

A thermodynamic perspective to study energy performance of vacuum-based membrane dehumidification

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