Preparation and characteristics of microencapsulated palmitic acid with TiO2 shell as shape-stabilized thermal energy storage materials

Cao, Lei; Tang, Fang; Fang, Guiyin

doi:10.1016/j.solmat.2014.01.023

Cited by 171 publications

(52 citation statements)

References 29 publications

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“…Two peaks appearing at the binding energy of 530.2 and 531.8 eV are attributed to the O-Ti and O-H bonds, respectively. The above binding energy data are very similar to those of the microencapsulated PCMs with the amorphous TiO 2 shell reported by Cao et al [27] Moreover, the EDX and XPS results are in good agreement with those of the other reported TiO 2 -based materials and thus confirm the successful encapsulation of n-eicosane with the TiO 2 shell [32][33][34].…”

Section: Synthesis and Characterizationssupporting

confidence: 89%

“…The in-situ polycondensation of titania precursor in a sol-gel process is considered as a feasible method for the synthesis of the microencapsulated PCMs with a TiO 2 shell as reported by Fang et al [27,28], whereas such a sol-gel synthetic strategy could not cause the formation of the crystalline TiO 2 shell. It is evident that the amorphous TiO 2 wall material is not expected due to its lack of photocatalytic activity [29].…”

Section: Synthesis and Characterizationsmentioning

confidence: 99%

“…We also reported the synthesis of silica-microencapsulated PCMs using sodium silicate as a low-cost silica precursor and found that these microcapsules exhibited a well-defined core-shell structure and a uniform particle size under the moderately acidic condition [23]. The latest literature survey indicated that aluminum hydroxide, calcium carbonate, and titanium dioxide (TiO 2 ) could also be employed as inorganic wall materials for the encapsulation of PCMs [24][25][26][27]. Nevertheless, the aforementioned inorganic encapsulation technologies toward PCMs are unexceptionally developed to serve the solo function of latent heat storage.…”

Section: Introductionmentioning

confidence: 99%

“…The resultant microencapsulated PCMs not only have a capability of latent-heat storage but also achieve the specified photocatalytic function derived from the crystalline TiO 2 shell. Fang et al [27] have reported the synthesis of microencapsulated PCMs with a TiO 2 shell, and however, the formed TiO 2 shell is amorphous and inert without any physicochemical functions as a result of the hydrothermal synthesis of organic titanium source. By now, there have no other references reporting the synthesis of microencapsulated PCMs with the crystalline TiO 2 shell.…”

Section: Introductionmentioning

confidence: 99%

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Development of bifunctional microencapsulated phase change materials with crystalline titanium dioxide shell for latent-heat storage and photocatalytic effectiveness

2015

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Section: Synthesis and Characterizationssupporting

confidence: 89%

Section: Synthesis and Characterizationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development of bifunctional microencapsulated phase change materials with crystalline titanium dioxide shell for latent-heat storage and photocatalytic effectiveness

2015

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“…With the emulsion coating, the microcapsules had the semi-crystalline structures with the characteristic peaks of palmitic acid at 2θ of 7.9, 21.3, and 23.5° (Fig. 4b-d) (Cao et al 2014). The degree of crystallinity exhibited by the coated microcapsules was increased with the increase in the palmitic acid concentrations Fig.…”

Section: Crystal Structuresmentioning

confidence: 92%

Encapsulation of Holy Basil Essential Oil in Gelatin: Effects of Palmitic Acid in Carboxymethyl Cellulose Emulsion Coating on Antioxidant and Antimicrobial Activities

Ngamakeue

Chitprasert

2016

Food Bioprocess Technol

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The challenge of using essential oils possessing antioxidant and antimicrobial properties in food industry is to maintain their chemical stability. This research examined the roles of emulsion coating in preventing the degradation of holy basil essential oils (HBEO) during storage. The uncoated HBEO-loaded gelatin microcapsules and those coated with 1, 2, and 3 % palmitic acid emulsified in carboxymethyl cellulose, denoted as UC, C-1P, C-2P, and C-3P, respectively, had HBEO contents of 76.35, 76.09, 68.96, and 59.39 % with the surface oils of 1.31, 0.65, 0.65, and 0.84 %, respectively. The increase in the palmitic acid concentrations caused a significant increase in the L * values (p < 0.05). After 90 days of storage at 30°C, the surface oils of UC, C-1P, C-2P, and C-3P significantly increased to 3.65, 2.43, 2.15, and 3.03 %, respectively, coincident with the decrease in the L * values. Xray diffraction studies revealed that the crystalline structures of the microcapsules were influenced by gelatin renaturation and palmitic acid polymorphism. The antioxidant activities, expressed as IC 50 , of the free and encapsulated HBEO before storage were 0.30 mg/ml. After storage, IC 50 of only C-2P remained constant, while those of the rest significantly increased (p < 0.05). The minimum inhibitory concentrations (MICs) and minimum bactericidal concentrations (MBCs) of all the samples against pathogenic bacteria did not change over storage. C-3P exhibited the strongest antimicrobial activity of MIC of 0.625 mg/ml and MBC of 1.25 mg/ml. These findings suggest that the emulsion coating enables shelf life extension of HBEO-loaded gelatin microcapsules.

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In situ incorporation and loading of copper nanoparticles into a palmitic–lauric phase‐change material on polyester fibers

Rezaie

Montazer

2018

J of Applied Polymer Sci

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This article introduces a facile approach for applying a eutectic mixture of fatty acid phase-change materials (PCMs) on polyester fibers for thermal conductivity improvement via the in situ incorporation of copper nanoparticles. For this purpose, a eutectic mixture of palmitic acid and lauric acid was applied as PCMs and ascorbic acid was applied for the synthesis of copper nanoparticles. The thermal properties and stability of the treated samples were also determined by differential scanning calorimetry and thermogravimetry analysis. The treated samples indicated appropriate phase-transition temperatures between 29.1 and 36.8 C, with relevant latent heats of 49.4 and 49.9 J/g, respectively. The in situ formation of copper nanoparticles into eutectic fatty acid applied on the polyester fibers resulted in the promotion of the thermal conductivity of the composite by about 100.1% with the maximum amount of nanoparticles. In addition, the treated samples maintained good thermal durability and stability after 100 melting and freezing cycles. In addition, the tensile strength of the treated samples was improved. Overall, this treatment could be used to produce promising form-stabilized composite PCMs and thermoregulated polymers and textiles with appropriate phase-transition ranges and thermal conductivity.

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Preparation and characteristics of microencapsulated palmitic acid with TiO2 shell as shape-stabilized thermal energy storage materials

Cited by 171 publications

References 29 publications

Development of bifunctional microencapsulated phase change materials with crystalline titanium dioxide shell for latent-heat storage and photocatalytic effectiveness

Development of bifunctional microencapsulated phase change materials with crystalline titanium dioxide shell for latent-heat storage and photocatalytic effectiveness

Encapsulation of Holy Basil Essential Oil in Gelatin: Effects of Palmitic Acid in Carboxymethyl Cellulose Emulsion Coating on Antioxidant and Antimicrobial Activities

In situ incorporation and loading of copper nanoparticles into a palmitic–lauric phase‐change material on polyester fibers

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