The σ and S of the samples were measured on a commercial instrument (CTA-3, Cryoall, China). The samples were cut into long strips with size of ~3 mm by 3 mm by 14 mm and tested in a low-pressure argon atmosphere. The temperature range was from 323 to 823 K with a 50-K ramp-up step, and the testing error of σ and S is about ±3%. The Hall coefficient (RH) was measured by a Lakeshore 8404 Hall effect test system from Lakeshore (USA). The n and Hall carrier mobility (μ) of the samples were calculated according to n = 1/(eRH) and μ = σRH, respectively, where e is the elementary charge. The thermal diffusion coefficient (D) was obtained by a laser flash method on a LFA 467 HT (Netzsch, Germany) with uncertainty of about ±6%. The κ was calculated according to κ = DCpρ, where Cp is the specific heat capacity and ρ is the density. The Cp was measured on a simultaneous thermal analyzer (STA 449 F1, Netzsch, Germany), and the ρ was obtained by the Archimedes’ drainage method. The densities and relative densities of the samples are shown in table S1.
Lfa 467 ht
Manufactured by Netzsch
Sourced in Germany
The LFA 467 HT is a laser flash analyzer that measures the thermal diffusivity and thermal conductivity of solid and powder materials at high temperatures. The instrument uses the laser flash method to determine these properties across a wide temperature range.
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Lab products found in correlation
2 protocols using lfa 467 ht
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Thermoelectric Properties Characterization
2
Thermal Properties and Stability of PUMA/SiO2 Composites
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To access the thermal properties of PUMA/SiO2 composites across varying SiO2 concentrations, thermal diffusivity tests were conducted using a laser flash analyzer (Netzsch LFA 467 HT, Netzsch-Gerätebau GmbH, Selb, Germany) following the ASTM E1461 standard [45 ]. The device is equipped with a xenon flash lamp, a liquid nitrogen-cooled InSb IR detector, and furnaces. The test samples were additively manufactured with a dimension of 10 × 10 × 1 mm, under the conditions of 35 °C vat temperature and 150 s postcuring. Through the thermal diffusivity tests, various thermal properties including thermal diffusivity (α), thermal conductivity (k), and specific heat (Cp) were obtained. These properties are related by the following equation:
where ρ is the bulk density of the PUMA/SiO2 composites.
To evaluate the thermal stability of PUMA/SiO2 composites, thermogravimetric analysis (TGA) was conducted. Samples with different SiO2 contents were prepared by cutting PUMA/SiO2 specimens into 10 mg pieces. The experiments were carried out using a thermal analysis system (DTG-60H, Shimadzu, Kyoto, Japan) with a heating rate of 10 °C/min under nitrogen conditions, spanning a temperature range from 30 °C to 550 °C. The flow rate of hot air was maintained at 60 mL/min.
where ρ is the bulk density of the PUMA/SiO2 composites.
To evaluate the thermal stability of PUMA/SiO2 composites, thermogravimetric analysis (TGA) was conducted. Samples with different SiO2 contents were prepared by cutting PUMA/SiO2 specimens into 10 mg pieces. The experiments were carried out using a thermal analysis system (DTG-60H, Shimadzu, Kyoto, Japan) with a heating rate of 10 °C/min under nitrogen conditions, spanning a temperature range from 30 °C to 550 °C. The flow rate of hot air was maintained at 60 mL/min.
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