Leakage-proof microencapsulation of phase change materials by emulsification with acetylated cellulose nanofibrils

Shi, Xuetong; Yazdani, Maryam Roza; Ajdary, Rubina; Rojas, Orlando J.

doi:10.1016/j.carbpol.2020.117279

Cited by 45 publications

(27 citation statements)

References 46 publications

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“…Likewise, the released heat corresponding to crystallization was −155.5 J·g –1 , which remained above −151 J·g –1 after 100 cycles. Given that neat paraffin exhibits a phase-change enthalpy of 212 J·g –1 , 70 74 and 80% paraffin were held in small- and large-diameter filaments, respectively. A highly repeatable thermal storage behavior is shown for all the HF-PCM, with the large diameter HF showing a thermal capacity close to that of the neat PCM ( Figure 5 c).…”

Section: Resultsmentioning

confidence: 99%

Hollow Filaments Synthesized by Dry-Jet Wet Spinning of Cellulose Nanofibrils: Structural Properties and Thermoregulation with Phase-Change Infills

Reyes

Ajdary

Yazdani

et al. 2022

ACS Appl. Polym. Mater.

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We use dry-jet wet spinning in a coaxial configuration by extruding an aqueous colloidal suspension of oxidized nanocellulose (hydrogel shell) combined with airflow in the core. The coagulation of the hydrogel in a water bath results in hollow filaments (HF) that are drawn continuously at relatively high rates. Small-angle and wide-angle X-ray scattering (SAXS/WAXS) reveals the orientation and order of the cellulose sheath, depending on the applied shear flow and drying method (free-drying and drying under tension). The obtained dry HF show Young’s modulus and tensile strength of up to 9 GPa and 66 MPa, respectively. Two types of phase-change materials (PCM), polyethylene glycol (PEG) and paraffin (PA), are used as infills to enable filaments for energy regulation. An increased strain (9%) is observed in the PCM-filled filaments (HF-PEG and HF-PA). The filaments display similar thermal behavior (dynamic scanning calorimetry) compared to the neat infill, PEG, or paraffin, reaching a maximum latent heat capacity of 170 J·g –1 (48–55 °C) and 169 J·g –1 (52–54 °C), respectively. Overall, this study demonstrates the facile and scalable production of two-component core-shell filaments that combine structural integrity, heat storage, and thermoregulation properties.

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Section: Resultsmentioning

confidence: 99%

Hollow Filaments Synthesized by Dry-Jet Wet Spinning of Cellulose Nanofibrils: Structural Properties and Thermoregulation with Phase-Change Infills

Reyes

Ajdary

Yazdani

et al. 2022

ACS Appl. Polym. Mater.

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“… 21 The AcCNFs successfully emulsified paraffin in water at 80 °C, and the droplets solidified into microparticles with AcCNF networks adsorbed on the particle surface after cooling. 21 Thermoresponsive poly(NIPAM) brushes were grafted on CNCs by Zoppe et al and the heptane-in-water emulsions using these materials were reported to be stable for 4 months. 31 Tang et al prepared pH and temperature sensitive heptane-in-water and toluene-in-water emulsion systems using polyelectrolyte, poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) modified CNCs.…”

Section: Introductionmentioning

confidence: 99%

“… 21 , 31 − 33 Acetylation has been used to chemically modify cellulose nanofibers (CNF), reducing their surface energy and hydrophilicity by partially replacing the hydroxyl groups. 21 Acetylated CNFs (AcCNFs) were found to provide a higher paraffin encapsulation efficiency since they are found to be more compatible with this liquid. 21 The AcCNFs successfully emulsified paraffin in water at 80 °C, and the droplets solidified into microparticles with AcCNF networks adsorbed on the particle surface after cooling.…”

Section: Introductionmentioning

confidence: 99%

“… 21 Acetylated CNFs (AcCNFs) were found to provide a higher paraffin encapsulation efficiency since they are found to be more compatible with this liquid. 21 The AcCNFs successfully emulsified paraffin in water at 80 °C, and the droplets solidified into microparticles with AcCNF networks adsorbed on the particle surface after cooling. 21 Thermoresponsive poly(NIPAM) brushes were grafted on CNCs by Zoppe et al and the heptane-in-water emulsions using these materials were reported to be stable for 4 months.…”

Section: Introductionmentioning

confidence: 99%

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Octylamine-Modified Cellulose Nanocrystal-Enhanced Stabilization of Pickering Emulsions for Self-Healing Composite Coatings

Nigmatullin

Koev

et al. 2022

ACS Appl. Mater. Interfaces

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Linseed oil-in-water Pickering emulsions are stabilized by both sulfated CNCs (sCNCs) and octylamine-modified CNCs (oCNCs). oCNCs with hydrophobic moieties grafted on the surfaces of otherwise intact nanocrystals provided emulsions exhibiting stronger resistance to creaming of oil droplets, compared with unmodified sCNCs. sCNCs were not able to completely stabilize linseed oil in water at low CNC concentrations while oCNCs provided emulsions with no unemulsified oil residue at the same concentrations. Oil droplets in oCNC emulsions were smaller than those in samples stabilized by sCNCs, corresponding with an increased hydrophobicity of oCNCs. Cryo-SEM imaging of stabilized droplets demonstrated the formation of a CNC network at the oil–water interface, protecting the oil droplets from coalescence even after compaction under centrifugal force. These oil droplets, protected by a stabilized CNC network, were dispersed in a water-based commercial varnish, to generate a composite coating. Scratches made on these coatings self-healed as a result of the reaction of the linseed oil bled from the damaged droplets with oxygen. The leakage and drying of the linseed oil at the location of the scratches happened without intervention and was accelerated by the application of heat.

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“…The blending method, microcapsule method, and chemical grafting method are commonly used to prepare cellulose-based PCM composites, such as the cellulose nano-fibril-polyethylene glycol composite, acetylated cellulose nano-fibril-based PCM composites, and cellulose nano-fiber-paraffin composites . It is easiest to obtain cellulose-based PCMs by using the blending method, of the three above.…”

Section: Introductionmentioning

confidence: 99%

Design and Fabrication of Epichlorohydrin-Cross-Linked Methyl Cellulose Aerogel-Based Composite Materials for Magnetic UV Response Light-to-Heat Conversion and Storage

Fang

Feng

2021

Biomacromolecules

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The collection, storage, and use of energy and information are important issues for overcoming the global energy shortage while satisfying the demand for information transmission. This research reports a nano-Fe 3 O 4 and erythritol (ER)-functionalized, cross-linked methyl cellulose aerogel (MC−EP) composite that has the characteristics of phase-change energy storage as the magnetic and ultraviolet responses requisite for light-to-heat conversion and storage. The nano-Fe 3 O 4 particles in MC−EP− ER-75 were fixed and filled into pore structures in MC−EP. ER was used to form an effective combination with MC−EP. The addition of nano-Fe 3 O 4 compensated for the low thermal conductivity of ER. The MC−EP−ER-75 was able to store solar radiationinduced energy due to the loading of ER at a photothermal conversion efficiency of 79.67% and a light-to-heat conversion efficiency of 79.67%. The results of thermal stability (TGA) analysis showed that MC−EP−ER-75 was thermally degraded acceptably below 200 °C. The differential scanning calorimetry curve and latent heat values (melting/crystallization enthalpies of 314.8 and 197.9 J/g, respectively) of MC−EP−ER-75 did not change after 100 cycles. In addition, it exhibited excellent saturation magnetization, superparamagnetism, and ultraviolet shielding, as well as a rapid response to the ultraviolet and magnetic fields. This provided a way to prepare light-to-heat conversion−storage−release materials and ultraviolet−magnetic sensors that can be used in renewable resources.

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Leakage-proof microencapsulation of phase change materials by emulsification with acetylated cellulose nanofibrils

Cited by 45 publications

References 46 publications

Hollow Filaments Synthesized by Dry-Jet Wet Spinning of Cellulose Nanofibrils: Structural Properties and Thermoregulation with Phase-Change Infills

Hollow Filaments Synthesized by Dry-Jet Wet Spinning of Cellulose Nanofibrils: Structural Properties and Thermoregulation with Phase-Change Infills

Octylamine-Modified Cellulose Nanocrystal-Enhanced Stabilization of Pickering Emulsions for Self-Healing Composite Coatings

Design and Fabrication of Epichlorohydrin-Cross-Linked Methyl Cellulose Aerogel-Based Composite Materials for Magnetic UV Response Light-to-Heat Conversion and Storage

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