Phase evolution and properties of novel Al2O3-based poly-hollow microsphere (PHM) ceramics

Design and Preparation of the Phase Change Materials Paraffin/Porous Al2O3@Graphite Foams with Enhanced Heat Storage Capacity and Thermal Conductivity

“…As for the spectrum of Al 2 O 3 and the composite PAGFP in Figure , the bands near 595 cm –1 are attributed to the Al–O bonds, and the bands at 661 cm –1 correspond to the absorption peaks of octahedral AlO 6 species. − In the spectrum of paraffin and the composite PAGFP, peaks at 2845 and 2915 cm –1 could be ascribed to the symmetric and asymmetric stretching vibrations of C–H. The peak at 719 cm –1 corresponds to the rocking vibration of CH 2 .…”

“…Porous alumina (Al 2 O 3 ) foam as a supporting material was seldom studied in the past, but it has numerous advantages over other supporting materials, such as low cost, fire resistance, high specific surface area, high thermal stability, high catalytic activity, high chemical stability, low density, and nontoxicity. Therefore, porous Al 2 O 3 foams are very valuable and suitable for the synthesis of form-stable composite PCMs for energy storage. , Up to now, lots of inorganic and organic PCMs and their mixtures have been widely studied as latent heat storage materials . Among the low-temperature PCMs, paraffin has been widely used for latent heat storage applications due to its high latent heat storage capacity, self-nucleating behavior, good thermal characteristics, and chemical stability; therefore, it is feasible to use porous Al 2 O 3 foam as supporting material and paraffin as PCM material to prepare form-stable composite PCMs.…”

Enhancement of Thermal Performance of Composite Phase Change Materials by Graphite In Situ Modified Al2O3 Porous Support

“…38 alumina (Al 2 O 3 ) foam, with the advantages of high thermal conductivity, nontoxicity, fire resistance, low density, high specific surface area, good thermal and chemical stability, and low cost, has broad application prospects in sPCMs. 43,44 In this work, a series of graphite/Al 2 O 3 foams (GAFs) have been prepared with high porosity and enhanced thermal conductivity, which meet specific applications in sPCMs. In particular, particle-stabilized emulsion as a template during the preparation process, which, given the GAF, supports a tunable three-dimensional interconnected pore structure by an easy way.…”

“…Especially organic support materials are usually toxic and flammable, which greatly limit their application in construction, food cold chain transportation, and so on. Even though carbon materials, mineral materials, metal foam, etc., as support materials can solve these problems, they are usually accompanied by high costs and difficulties in structural adjustment. − Porous alumina (Al 2 O 3 ) foam, with the advantages of high thermal conductivity, nontoxicity, fire resistance, low density, high specific surface area, good thermal and chemical stability, and low cost, has broad application prospects in sPCMs. , …”

Preparation and Characterization of Undoped and Chromia-Doped Porous Alumina Using Different-Sized Particles

“…Among porous materials, porous ceramics possess many advantages over other porous materials such as polymers or metals, namely high hardness, chemical inertness, thermal shock resistance, corrosion and wear resistance, and low density [4][5][6][7][8][9]. Alumina (Al 2 O 3 ) has been one of the most common materials for applications of porous ceramics such as lters, catalysis, and thermal insulators [10][11][12]. It is well known that Al 2 O 3 enables the highest operating temperature, and additionally exhibits the good mechanical properties even at high porosity [13][14][15][16][17].…”