Phase-Change Composites Composed of Silicone Rubber and Pa@SiO₂@PDA Double-Shelled Microcapsules with Low Leakage Rate and Improved Mechanical Strength

Abstract

A kind of silicone rubber (SR)/paraffin (Pa)@silicon dioxide (SiO 2 )@polydopamine (PDA) phase-change composite was prepared in this work. The double-shelled Pa@SiO 2 @PDA phase-change microcapsules were constructed by oxidative self-polymerization of dopamine (DA) in Tris-HCl buffer solution. The effect of the DA content on the properties of Pa@SiO 2 @ PDA microcapsules and SR/Pa@SiO 2 @PDA composites was researched. Due to the protective effect of SiO 2 , PDA layer, and SR matrix, the SR/Pa@ SiO 2 @PDA composites have good leak-proofing performance, and the leakage rate of SR/Pa@SiO 2 @PDA-2 is as low as 0.45%. Phase-change enthalpies of the Pa@SiO 2 @PDA microcapsules and SR/Pa@SiO 2 @PDA composites are reduced slightly with increasing DA content. Meanwhile, the composites displayed improved mechanical strength. The tensile strength of SR/Pa@SiO 2 @PDA-2 can be up to 0.560 MPa, which is 1.85 times higher than the tensile strength of pure SR/Pa@SiO 2 because the interface compatibility between Pa@SiO 2 microcapsules and SR is improved through hydrogen bonding between the abundant groups on the PDA surface and the matrix. Moreover, the rough surface of the PDA-modified microcapsules also enhances the interface interaction through physical "interlocking". The new kind of SR/Pa@SiO 2 @PDA composite can be used for thermal management.

Melamine sponge decorated with Fe 3 O 4 /CuS nanoparticles as novel peroxidase‐like nanozyme for disinfection

“…The elements present in S/PDA/Fe 3 O 4 /CuS composite were also determined from the survey spectrum (Figure 3A). The present elements were C, N, O, Fe, Cu, and S [30]. The high resolution XPS results of all elements are presented in Figure 3B–G.…”

Review on organic phase change materials for sustainable energy storage

“…There are many methods that have been explored for the introduction of inorganic materials into polymeric shells, including the dispersion of inorganic nanoparticles, utilization of modied inorganic nanoparticles as Pickering stabilizers, synthesis of organic-inorganic double-layered shells and so on. [91][92][93][94] The selection of organic/inorganic combination is the critical factor affecting the thermal properties and latent heatstorage capability of microcapsules. 95,96 2.2.1 Metal oxide nanoparticles.…”

Mussel-inspired PDA-based MIP-SERS sensor for the detection of trace MG in environmental water

“…44,45 Compared with SA-100, the infrared spectrum of SA-100@MIP has two new peaks, 1540 cm −1 and 1385 cm −1 , which are attributed to CvN and CvN-C bonds in the indole group of PDA. 46 Fig. 3E shows the XRD patterns of SA-100 and SA-100@PDA.…”