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In this study , a custom-built test rig was used to characterise the thermal conduction for three triply periodic minimal surface lattice types , namely : gyroid , diamond and Schwarz primitives , with unit cell size and volume fraction being varied.Results show that thermal conductivity is primarily a function of the material properties and volume fraction of the sample .
 triply periodic minimal surface, lattice, diamond, unit cell, volume fraction, thermal conductivity, material properties, volume fraction, sample
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 triply periodic minimal surface, lattice, diamond, unit cell, volume fraction, thermal conductivity, material properties, volume fraction, sample