Thermal Conductivity of Zinc Oxide Micro- and Nanocomposites

Abstract

The thermal conductivity of the composite materials based on the zinc oxide powders with different average particle sizes (micrometer, submicrometer and nanometer) dispersed in the polymethylsiloxane (silicone oil) was measured using the radial heat flow method. The thermal conductivity of the composite material based on the commercial ZnO micropowder with an average particle size of 50 m was found to be 0.8 W/(m•K). The thermal conductivity of the composite material on the basis of ZnO nanopowder with an average particle size of approximately 3 nm synthesized using the wet chemistry methods was found to be 2.5 W/(m•K). The discovered enhancement of the above mentioned parameter is considered as manifestation of the quantum size effects in heat transfer.

Electrophysical Properties and Thermal Conductivity of Reduced Graphene Oxide–ZnO Composite

“…At room temperature, the obtained values of the dielectric permittivity  at the frequencies of electric measuring field 50 Hz or 1 MHz and specific bulk electrical resistance  (50 Hz) for the two composites are given in Table . The coefficients of thermal conductivity  of the investigated composites were calculated based on the following relation [11]:…”

“…Determination of the thermal conductivity of the composites was carried out by radial heat-flow method [11].…”

Quantum Dot-sensitized Solar Cells: A Review

“…Nonocrystals behave differently from their corresponding bulk material because of quantum confinement effect. The Bohr exciton radius of most of the semiconductor is in the range of 1~10 nm, for example it is 2 nm for ZnO [34], 3 nm for CdS [35], 5.3 nm for CdSe [36]. However, some semiconductors have large Bohr exciton radius like it is 18 nm for PbS [37], 46 nm for PbSe [38] and 65.6 nm for InSb [36].…”

Thermo‐mechanical properties of flexible and rigid polyurethane (PU)/Cu composites

“…[1][2][3] As a result, polymer composite is one of the options to boost thermal conductivity of polymers. Many high thermally conductive fillers, such as metals, [4][5][6][7][8] ceramics, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] nanophase material, [26][27][28][29][30][31][32][33] and others, can be included in polymer-matrices for this purpose. However, many fields of engineering are interested in polymer composites filled with conductive metal particles.…”