Graphene oxide modified hydrate salt hydrogels: form-stable phase change materials for smart thermal management

Abstract

The adjustment of phase transition behaviors based on the special interaction of GO and PAAAM with hydrate salt PCM.

Hydrothermal Carbon Doped Form‐Stable Inorganic Hydrate Salts Phase Change Materials with Excellent Reutilization

“…Thes upercooling degrees of EHS,E HS/PAAAM, and HTC-EHS/ PA AAM are calculated and presented in Figure 8( 16.3, 14.6, and 7.9 8C). TheH TC-EHS/PAAAM composite shows the narrowest supercoolingd egree,a nd this means that the 1.4 wt %d oping of HTC can effectively adjust the supercooling effect of EHS.C ompared with the previous research, [36] 2wt% content of graphene oxide (GO) was required to achieve the same effect, for which the melting enthalpyo fG O-EHS/PAAAM was 200.3 Jg À1 and the supercooling degree was 8.0 8C. In comparison,H TC-EHS/PAAAMw ith lower HTC content showedb etter performance in the thermal properties of form-stable PCMs.T he reason may be different morphologies of GO and HTC,w hich exhibit flake structure and spherical structure,r espectively.…”

“…As an interestingp henomenon, on the right-hands ide of Figure 4, the original characteristic absorption peak of C=Oi np ure PA AAM was observed at 1554 cm À1 , [56] when PA AAM was mixed together with EHSt op roduce EHS/PAAAM, the absorption peak of C=Os hifted from 1554 to 1576 cm À1 ;h owever, with the addition of HTC in HTC-EHS/PAAAM, the absorption peak position of C=Oi nP AAAMc hanged again, moving to 1560 cm À1 .C ompared with the peak position in EHS/PAAAM, itm oved closer to the original position in pure PA AAM. Known from this phenomenon and the above-mentioned previous research, [32][33][34][35][36] it is inferred that the additiono fH TC could partly protect PA AAM form the influence of EHS;i no ther words,w ith the addition of HTC the influence of PA AAM on EHS could be reduced,s ot hat EHS could betterm aintain its original thermal storage function.…”

“…[35] Thus the performanceo ft he thermal management systems can be improved by adding high thermal conductivity nanofillers. [36][37][38][39] Carbon-based materials are preferred to be chosen as nanofillers by many researchers.K im et al prepared composite PCMs by adding graphite into paraffin, and the thermal conductivities of the composite PCMs improved evidently, where 7wt% graphite increased the thermal conductivity to 0.8 Wm À1 K À1 from 0.26 Wm À1 K À1 ; [40] the results are comparable to Zhangsp revious report. [41] Liu and co-workers re-Form-stable phase-change materials (PCMs) are increasingly meaningfult ot hermals torage technology in variousa pplication environments.…”

Inorganic Salt Hydrate for Thermal Energy Storage

“…% EG was known as the most suitable selection. Liu [65] combined graphene oxide-modified hydrate salt with poly copolymer hydrogel. The results indicated that the obtained composite was a promising material for achieving further Porous materials like carbon foam, diatomite, expanded graphite and expanded perlite used as supporting materials can also effectively overcome leakage, phase separation and corrosion problems of PCMs.…”

“…Ultimately, the system with 3 wt % EG was known as the most suitable selection. Liu [65] combined graphene oxide-modified hydrate salt with poly copolymer hydrogel. The results indicated that the obtained composite was a promising material for achieving further phase transition behavior targets, which can be used for thermal storage under a wide scope of ambient temperatures.…”