Mechanistic Studies on the Anomalous Transport Behaviors of Water Molecules in Nanochannels of Multilayer Graphynes

An in-depth understanding of directed transport behaviors of water molecules through nanoporous materials is essential for the design and development of next-generation filtration devices. In this work, we perform molecular...

Study of the influence of various solvents on the properties of hydrophobic silica xerogels

Silica aerogels are low-density inorganic aerogels with a three-dimensional nanoporous structure. Due to the inherent properties of nanoporous materials, the possibility of using silica airgel is of great interest in various fields. To simplify the process and reduce costs, the use of atmospheric pressure drying (APD) is promising, the resulting materials are called xerogels. Silica xerogels based on methyltrimethoxysilane were synthesized using various alcohol solvents. The optimal combination of properties is possessed by a sample obtained using methanol as a solvent. The wetting angle of all xerogels was 158°, which characterizes the resulting material as superhydrophobic.

Thermal, mechanical, and electrical properties of difunctional and trifunctional epoxy blends with nanoporous materials

In the present study, the aim is to synthesize the particulate nanocomposites with difunctional and trifunctional epoxy blend as matrix and synthesized nanoporous materials as fillers. Organic/inorganic hybrid networks were prepared by the novel solvent free method. Viscoelastic, thermal, and electrical properties of di- and trifunctional epoxy and the effect of different nanoparticles in the particulate nanocomposites have been studied by dynamic mechanical analyzer, thermogravimetry (TGA), and dielectric strength. Epoxy mixed with different compositions of TGPAP and particulate nanocomposites by the addition of different types of nanomaterials shows higher storage modulus than the pure epoxy. The addition of TGPAP and nanofillers decreases the thermal stability of epoxy matrix. The evolved gas analysis (TG-FTIR) was also done in order to study the products formed during degradation. An increase in dielectric strength and impact strength (4%) was also observed in the particulate nanocomposites.

INVESTIGATION OF THE THERMODYNAMIC CHARACTERISTICS OF THE EXTRACTION OF COPPER IONS FROM AQUEOUS SOLUTIONS USING ACTIVATED CARBON

Изучение термодинамических и кинетических характеристик позволяет более эффек- тивно использовать углеродные адсорбенты в технологических процессах, чем поддерживается тех- нология их использования на оптимальном уровне. В работе изучалась адсорбционная активность углеродных нанопористых материалов, рассчитывались кинетические характеристики процесса ад- сорбции, термодинамические характеристики (энергия Гиббса, энтальпия, константа адсорбции) адсорбции ионов меди на активных углях, полученных на установках (модульная пиролизная реторт- ная установка) и УВП (углевыжигательная печь). Установлено, что процесс идёт самопроизвольно, характер адсорбционного взаимодействия экзотермический. Адсорбционные равновесие достигается меньше чем за 15 мин. The study of thermodynamic and kinetic characteristics allows more efficient use of carbon adsorbents in technological processes. Thus, keeping their use at an optimal level. The adsorption activity of carbon nanoporous materials was studied, the kinetic characteristics of the adsorption process, thermodynamic characteristics (Gibbs energy, enthalpy, adsorption constant) of copper adsorption on activated carbons obtained at MPRP and CK installations were calculated in this work. It was found that the process is spontaneous (G <0). The nature of the adsorption behavior is exothermic. Adsorption equilibrium is achieved in less than 15 minutes.