فصلنامه دنیای نانو
پیاپی 67 (تابستان 1401)

In many key industries such as oil and gas, electronics, semiconductor, and food, measuring and controlling humidity is a critical and basic requirement. In these industries, moisture is a type of pollutant and leads to a significant reduction in product quality, equipment damage, and increased costs. The measurement variable is relative humidity, which expresses the amount of water vapor in the system as a fraction of the amount of moisture in the saturated state. On the other hand, absolute humidity is used more in the industry which is the mass of water vapor per unit volume of air will be at a certain temperature and pressure. Dew point is another common parameter of engineering sciences for measuring absolute humidity. The dew point indicates the amount of water vapor in the air stream and determines how to prevent condensation from forming. In recent years, quartz crystal sensors, due to their unique advantages, have attracted much attention for accurate and repeatable measurements of moisture and dew point. In this paper, a report on the mechanism of moisture absorption in these sensors in the presence of the studied nanomaterials will be presented.

Epoxy thermoset resins have been used in the composite, construction, electronics, adhesive and coatings industries due to their good thermal, electrical and chemical properties. Distribution and dispersion of nanoparticles in polymer matrix is an important and influential issue in the mechanical properties of epoxy nanocomposites. Curing kinetics equations are used to evaluate and optimize the production process, and degradation kinetics modeling has become widely used as an essential tool for engineers to reduce costs and product quality. Addition of modified carboxyl and amine groups to pure epoxy resin does not change the curing reaction mechanism and also modifying the surface of nanodiamond increases the curing rate of epoxy nanocomposite. Investigation of hybrid thermal stability of epoxy nanocomposites in the presence of nanodiamonds and graphene oxide showed that the simultaneous presence of two different types of nano material can increase the thermal stability. In this research, the effect of adding nano diamonds and modified nano diamonds on morphology, mechanical and rheological properties, and modeling of curing kinetics and degradation kinetics and tribological properties have been investigated.

Plasmonic nanoparticles such as noble metals are nanomaterials with a wide application in various fields, which is due to their unique optical properties arising from the surface plasmonic oscillation. When these nanoparticles are hybridized with other nanomaterials such as quantum dots and magnetic nanoparticles, not only retain their properties, but also show the properties of other hybrided materials. A plasmonic nanoparticle absorbs the visible light that cause a local warming, a quantum dot has the fluorescent property that can be used as a label and a magnetic nanoparticle has the magnetic property that can be separated by a magnet. So, the hybrid of these three properties causes the extent of their application. In the current study, we will review the properties of plasmonic nanohybrids and their reported applications in recent decades. Plasmonic nanohybrids are used in various fields such as identification, measurement, drug delivery, diagnosis and treatment. Herein, examples of these applications are given in detail.

A review on two-dimensional MXene materials and their application for increasing the photocatalytic properties of semiconductorsRezvaneh Amrollahi*, Pooneh NayebiDepartment of physics, Iran university of science and technology, Tehran, IranAbstract:The two-dimensional transition metal carbides, nitrides and carbonitrides (MXenes) ,that were first synthezied in 2011, have found many application in ion batteries, sensors, energy storage devices, and etc due to their high chemical diversity, structural complexities and electrical conductivity similar to metals. In addition, the MXene family is one of the most valuable candidates for improving and boosting the photocatalytic performance of semiconductors beacuse of its special surface, functional groups and also accelerating the separation of charge carriers. In this review, we tried to introduce the structure, prepration method of MXene and its effect on the photocatalytic properties of semiconductors for photodegradation of dyes, water splitting reaction, and CO2 conversion.