Microencapsulation of 1-hexadecanol as a phase change material with reversible thermochromic properties

Abstract

Herein, a novel approach for generating a microencapsulated reversible thermochromic phase change material (RTPCM) is described. The system described uses a spirolactone derivative color former, phenolic hydroxyl compound color developer, and 1-hexadecanol as the phase change material and cosolvent. The microencapsulation is achieved by complex coacervation of modified gelatin containing vinyl groups and gum arabic. This is followed by the crosslinking reaction between vinyl groups on modified gelatin and a divinyl crosslinker and subsequent crosslinking reaction with glutaraldehyde to improve stability and encapsulation efficiency. The influence of various key parameters on properties of the microcapsules (encapsulation efficiency, morphology, and particle size) are reviewed including the substitution degree of vinyl groups on modified gelatin, the type and amount of divinyl crosslinkers, and the core/shell ratio. Thermal properties and reversible color reliability of the generated microcapsules were found to be stable after 100 thermal heating and cooling cycles. Such microcapsules are well suited for latent heat storage and as an indicator for the states of energy saturation and consumption in phase change material applications directly through color change.

Development and Thermophysical Profile of Cetyl Alcohol-in-Water Nanoemulsions for Thermal Management

“…The heat transfer performance of that same emulsion and its potential for advanced temperature management in high voltage electrical devices was experimentally and numerically evaluated in two recent works from the same authors [19,20]. When it comes to fatty alcohols such as 1-hexadecanol (also known as cetyl or palmityl alcohol), these materials have proved effective as core for the preparation of micro- [21][22][23][24][25] or nano-encapsulated [26] PCMs. However, to the best of our knowledge, no research has been conducted on the preparation and characterization of aqueous phase change material nanoemulsions using cetyl alcohol as main component of dispersed phase.…”

Lignin‐retaining porous bamboo‐based reversible thermochromic phase change energy storage composite material

“…The analysis of phase change behavior of TBB‐LB also showed the same trend and a similar result based on the properties of LB, TD and TBB. Compared with other works, TBC‐LB (113.3 J g −1 ), TBB‐LB (113.6 J g −1 ) exhibited the higher latent heat value than those of microencapsulated 1‐hexadecanol (RTPCMs) (80.7 J g −1 ), composite PCMs with PEG (79.2 J g −1 ), solid‐solid PCM of PU/graphene (90 J g −1 ), binary composite complex fabricated by mixing tetradecanol/myristic acid into the hydroxylpropyl methyl cellulose matrix (102.11 J g −1 ) . To study the cycle and durability of TBC‐LB and TBB‐LB, 100 heating‐cooling cycles were performed.…”

Shape‐Stabilized PCMs@Foam‐Based Porous Polymers for Thermal Energy Storage

“…To our surprise, encapsulation ratios of PA@HCfoam‐1 reached 77.6 wt%, which was comparable to reported PCM composites, such as HW‐FSPCM, paraffin/SiO 2 composite and 1‐Octadecanol/porous polymer . Encapsulation ratios of other product were also calculated and listed in Table , which were slightly lower than PA@HCfoam‐1, but still had comparability with PEG/BC‐2, RTPCM and 1‐Tetradecanol/Ag nanowires …”