Thermal recoverability of a polyelectrolyte-modified, nanoporous silica-based system

Surani, Falgun B.; Han, Aijie; Qiao, Yu

doi:10.1557/jmr.2006.0287

Cited by 6 publications

(4 citation statements)

References 13 publications

(13 reference statements)

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“…Grand Canonical Monte Carlo (GCMC) simulations were first performed by Desbiens et al 53,77 who were able to reproduce the water intrusion-extrusion step-wise transition in silicalite-1 (MFI). This phenomenon was tentatively interpreted in terms of an equilibrium first-order vapor-liquid condensation, following Porcheron et al, 35 who pointed out the similarity between capillary condensation of a wetting fluid and forced intrusion of a non wetting fluid.…”

Section: Insights From Theory and Molecular Simulationmentioning

confidence: 99%

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Forced intrusion of water and aqueous solutions in microporous materials: from fundamental thermodynamics to energy storage devices

et al. 2017

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We review the high pressure forced intrusion studies of water in hydrophobic microporous materials such as zeolites and MOFs, a field of research that has emerged some 15 years ago and is now very active. Many of these studies are aimed at investigating the possibility of using these systems as energy storage devices. A series of all-silica zeolites (zeosil) frameworks were found suitable for reversible energy storage because of their stability with respect to hydrolysis after several water intrusion-extrusion cycles. Several microporous hydrophobic zeolite imidazolate frameworks (ZIFs) also happen to be quite stable and resistant towards hydrolysis and thus seem very promising for energy storage applications. Replacing pure water by electrolyte aqueous solutions enables to increase the stored energy by a factor close to 3, on account of the high pressure shift of the intrusion transition. In addition to the fact that aqueous solutions and microporous silica materials are environmental friendly, these systems are thus becoming increasingly interesting for the design of new energy storage devices. This review also addresses the theoretical approaches and molecular simulations performed in order to better understand the experimental behavior of nano-confined water. Molecular simulation studies showed that water condensation takes place through a genuine first-order phase transition, provided that the interconnected pores structure is 3-dimensional and sufficiently open. In an extreme confinement situations such as in ferrierite zeosil, condensation seem to take place through a continuous supercritical crossing from a diluted to a dense fluid, on account of the fact that the first-order transition line is shifted to higher pressure, and the confined water critical point is correlatively shifted to lower temperature. These molecular simulation studies suggest that the most important features of the intrusion/extrusion process can be understood in terms of equilibrium thermodynamics considerations.

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Section: Insights From Theory and Molecular Simulationmentioning

confidence: 99%

“…As a part of an important number of studies of the water infiltration-defiltration process in nanoporous materials, 10,[76][77][78][79][80][81][82] Qiao and coworkers 83,84 demonstrated that water could no longer infiltrate (i.e. ''be soaked up spontaneously'') in a hydrophilic zeolite Y when an electrolyte was added.…”

Section: Intrusion Of Electrolyte Solutionsmentioning

confidence: 99%

Forced intrusion of water and aqueous solutions in microporous materials: from fundamental thermodynamics to energy storage devices

et al. 2017

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“…The gate allows drug release to occur through the relative change in material properties of the ER hydrogel during a change in the pH. In addition, hydrogels have been used as energy storage and absorption devices enhancing the energy density and deformability achieved through thermal variations (Surani et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Actuator Designs using Environmentally Responsive Hydrogels

Westbrook

2007

Journal of Intelligent Material Systems and Structures

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Environmentally responsive (ER) hydrogels are hydrogels that can experience an abrupt volume change and hence hold or release a large amount of water under the change of certain environmental conditions, such as temperature, pH, or an electric field. Because of their unique capability to achieve a large yet reversible volume change, hydrogels have been widely used in microfluidics and biomedical applications, such as hydrogel sensors and actuators for microfluidic channels, novel drug delivery systems, and scaffolding materials for tissue engineering. In most applications, ER hydrogels are used to create an isotropic volume change or one-dimensional motion by constraining the hydrogel in the other two directions. In this study, using finite element based simulations, actuator designs are demonstrated that can generate a variety of shape changes by carefully patterning ER hydrogels on a non-ER hydrogel matrix. In these designs, as the environment changes, the ER hydrogels undergo volume change under the constraints imposed by the non-ER matrix, causing an eigenstrain (mismatch strain) and hence the deformation of the non-ER matrix. By properly controlling the locations of the ER hydrogel sections with respect to the non-ER hydrogel matrix, one can achieve a desired deformation of the composite structure. As examples, designs of a single material actuator, one linear spring composite actuator, and two coil composite actuators are demonstrated. The feasibility to produce these actuators and the possible applications are discussed at the end of the article.

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“…As the sorption isotherm is hysteretic at the first loading, the external work is effectively dissipated. The energy absorption efficiency, which is the area enclosed by the loading-unloading cycle, is about 70 J/g, much higher than that of nanoporous-silica functionalized liquids [23]. As the temperature is reduced back to room temperature, the gallium inside the nanopores should be solidified and, consequently, a three-dimensional gallium nanonetwork is produced.…”

Section: Resultsmentioning

confidence: 99%

Infiltration of liquid metals in a nanoporous carbon

Han

Punyamurtula

Qiao

2008

Philosophical Magazine Letters

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Gallium and mercury are employed as liquid phases in a nanoporous carbonbased energy absorption system. Owing to the large surface tensions, the nanopore surface is non-wettable. Pressure-induced infiltration is observed and defiltration is difficult. The energy absorption efficiency is much higher than that of previously investigated nanoporous silica-based systems. The nominal solid-liquid interfacial tension is dependent on the nanopore size.

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Thermal recoverability of a polyelectrolyte-modified, nanoporous silica-based system

Cited by 6 publications

References 13 publications

Forced intrusion of water and aqueous solutions in microporous materials: from fundamental thermodynamics to energy storage devices

Forced intrusion of water and aqueous solutions in microporous materials: from fundamental thermodynamics to energy storage devices

Actuator Designs using Environmentally Responsive Hydrogels

Infiltration of liquid metals in a nanoporous carbon

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