Effect of micro- and nanofibrillated cellulose on the phase stability of sodium sulfate decahydrate based phase change material

Oh, Kyudeok; Kwon, Soojin; Xu, Wen Yang; Wang, Xiaoju; Toivakka, Martti

doi:10.1007/s10570-020-03121-w

Cited by 16 publications

(8 citation statements)

References 34 publications

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“…In the present work, eight different additives were tested as stabilizing materials to improve the long-term TES stability of SSD. The thickeners investigated in this study are sodium polyacrylate (SPA), 20 cellulose nanofiber (CNF), 21 potassium polyacrylate (PPA), 22 hydroxyl ethyl cellulose (HEC), 23 CMC, 24 fumed silica, 25 poly(sodium 4-styrenesulfonate) (PSS), 26 and DSS. 19 A thorough understanding of the thickening and stabilization mechanisms was developed by investigating the phase stability and thermophysical properties of the PCM mixtures containing SSD and one of the eight stabilizing agents.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of low-cost phase change materials for thermal energy storage applications

Akamo,

Kumar,

et al. 2023

iScience

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Section: Introductionmentioning

confidence: 99%

Stabilization of low-cost phase change materials for thermal energy storage applications

Akamo,

Kumar,

et al. 2023

iScience

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“…The CNFs are more likely to aggregate into flocs, which, thus, increases the ink's viscosity at rest or at a low shear rate. However, the flocs are likely to be dissociated into nanofibrils at a high shear rate and difficult to recover immediately, leading to hysteresis behavior (Oh et al, 2020). Meanwhile, the flocs will also form an uneven microstructure of the ink, which is not conducive to its printability.…”

Section: Rheological Propertymentioning

confidence: 99%

Rheological and Printability Assessments on Biomaterial Inks of Nanocellulose/Photo-Crosslinkable Biopolymer in Light-Aided 3D Printing

Wang

Backman

Nuopponen³

et al. 2021

Front. Chem. Eng.

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Biomaterial inks based on cellulose nanofibers (CNFs) and photo-crosslinkable biopolymers have great potential as a high-performance ink system in light-aided, hydrogel extrusion-based 3D bioprinting. However, the colloidal stability of surface charged nanofibrils is susceptible to mono-cations in physiological buffers, which complexes the application scenarios of these systems in formulating cell-laden bioinks. In this study, biomaterial inks formulated by neutral and negatively surface charged CNFs (GrowInk-N and GrowInk-T) and photo-crosslinkable biopolymers (gelatin methacryloyl (GelMA) and methacrylated galactoglucomannan (GGMMA)) were prepared with Milli-Q water or PBS buffer. Quantitative rheological measurements were performed on the ink formulations to characterize their shear flow recovery behavior and to understand the intermolecular interactions between the CNFs of different kinds with GGMMA or GelMA. Meanwhile, printability assessments, including filament extrudability and shape fidelity of the printed scaffold under varying printing conditions, were carried out to optimize the printing process. Our study provides extensive supporting information for further developing these nanocellulose-based systems into photo-crosslinkable bioinks in the service of cell-laden 3D bioprinting.

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“…Thickening involves adding a substance to the salt hydrate that increases its viscosity and limits aggregation . Numerous thickening and gelation agents, including attapulgite clay, micro/nanofibrillated cellulose, carboxymethyl cellulose, sodium alginate, hydroxyl ethyl cellulose, and polyacrylamide have been studied and examined. − However, the ionic strength of PCM salt solutions can severely impact the functionality of the thickeners …”

Section: Introductionmentioning

confidence: 99%

Nanoscale Stabilization Mechanism of Sodium Sulfate Decahydrate at Polyelectrolyte Interfaces

Akamo,

Cladek,

Goswami

et al. 2024

ACS Omega

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Sodium sulfate decahydrate (SSD) is a low-cost phase-change material (PCM) for thermal energy storage applications that offers substantial melting enthalpy and a suitable temperature range for near-ambient applications. However, SSD's consistent phase separation with decreased melting enthalpy over repeated thermal cycles limits its application as a PCM. Sulfonated polyelectrolytes, such as dextran sulfate sodium (DSS), have shown great effectiveness in preventing phase separation in SSD. However, there is limited understanding of the stabilization mechanism of SSD by DSS at the atomic length and time scales. In this work, we investigate SSD stabilization via DSS using neutron scattering and molecular dynamics (MD) simulations. Neutron scattering and pair distribution function analysis revealed the structural evolution of the PCM samples below and above the phase change temperatures. MD simulations revealed that water from the hydrate structure migrates from the hydrate crystal to the SSD−DSS interfacial region upon melting. The water is stabilized at this interface by aggregation around the hydrophilic sulfonic acid groups attached to the backbone of the polyelectrolyte. This architecture retains water near the dehydrated sodium sulfate, preventing phase separation and, consequently, stabilizing SSD rehydration. This work provides atomistic insight into selecting and designing stable and high-performance PCMs for heating and cooling applications in building technologies.

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Effect of micro- and nanofibrillated cellulose on the phase stability of sodium sulfate decahydrate based phase change material

Cited by 16 publications

References 34 publications

Stabilization of low-cost phase change materials for thermal energy storage applications

Stabilization of low-cost phase change materials for thermal energy storage applications

Rheological and Printability Assessments on Biomaterial Inks of Nanocellulose/Photo-Crosslinkable Biopolymer in Light-Aided 3D Printing

Nanoscale Stabilization Mechanism of Sodium Sulfate Decahydrate at Polyelectrolyte Interfaces

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