In this volume are collected peer-reviewed papers that present the latest research results in the field of nanomaterials and nanotechnologies. Nanomaterials as photocatalysts for pollutant photodegradation, synthesis and properties of membrane for salt rejection in water treatment, synthesis polymer foam composite absorbent, mechanical properties of functionally graded carbon nanotube-reinforced composite beam, analysis possibilities of iron oxide nanoparticles applications in biomedical practice, synthesis and study of optical and electrical properties of nano semiconductors for optoelectronics, microelectronics and photovoltaics are the topics of this journal's volume. The presented edition will be helpful to a wide range of specialists from many branches of engineering science and production.