Nanoparticles play a crucial role in enhancing the thermal and rheological properties of nanofluids, making them a valuable option for increasing the efficiency of heat exchangers. This research explores how nanoparticle characteristics, such as concentration, size, and shape, impact the properties of nanofluids. Nanofluids' thermophysical properties and flow characteristics are essential in determining heat transfer efficiency and pressure loss. Nanoparticles with high thermal conductivity, such as metallic oxides like MgO, TiO₂, and ZnO, can significantly improve the heat transfer efficiency by around 30% compared to the base fluid. The stability of nanofluids plays a crucial role in their usability. Various methods, such as adding surfactants, using ultrasonic mixing, and controlling pH, have been employed to enhance the stability of nanofluids. The desired thermophysical properties can be achieved by utilizing nanofluids to enhance the system's heat transfer efficiency. Modifying the size and shape of nanoparticles also considerably improves thermal conductivity, affecting nanofluid viscosity and density. Equations for determining heat transfer rate and pressure drop in a double-pipe heat exchanger are discussed in this review, emphasizing the significance of nanofluid thermal conductivity in influencing heat transfer efficiency and nanofluid viscosity in impacting pressure loss. This Review identifies a trend indicating that increasing nanoparticle volume concentration can enhance heat transfer efficiency to a certain extent. However, surpassing the optimal concentration can reduce Brownian motions due to higher viscosity and density. This Review offers a viable solution for enhancing the thermal performance of heat transfer equipment and serves as a fundamental resource for applying nanofluids in heat transfer applications.

Solar stills represent a crucial technology in the quest to provide clean and accessible water, particularly in regions facing water scarcity and limited energy resources. This study investigates various solar still designs, exploring their advantages and limitations in water purification. Through an analysis of the current global landscape of solar still usage and ongoing research endeavors, this study aims to highlight the potential of solar stills and propose modifications to enhance their efficiency. The study also investigates various extensive analysis of diverse solar still designs and their performance metrics, including factors like reflectors, wick materials, absorber plates, and air velocity, this study elucidates key strategies to augment water output and energy utilization. Reflectors and pebbles, variations in wick materials, and modifications in absorber plate design have shown promising results in increasing productivity. Additionally, insights into the impact of environmental variables such as solar radiation, wind velocity, and ambient temperature on solar still performance are provided, informing the design optimization process. Through an analysis of global usage patterns and ongoing research efforts, this study highlights the untapped potential of solar stills and proposes strategies to enhance their performance. Furthermore, it suggests avenues for future research, including the integration of heat storage materials and the development of advanced modeling and control algorithms, to further enhance the performance of solar stills. Through these efforts, solar stills can emerge as a sustainable and reliable solution for water purification, contributing significantly to global efforts to combat water scarcity.

Herein, we report the design and synthesis of novel 7-aza-coumarine-3-carboxamides via scaffold-hopping strategy and evaluation of their in vitro anticancer activity. Additionally, the improved non-catalytic synthesis of 7-azacoumarin-3-carboxylic acid is reported, which features water as the reaction medium and provides a convenient alternative to the known methods. The anticancer activity of the most potent 7-aza-coumarine-3-carboxamides against the HuTu 80 cell line is equal to that of reference Doxorubicin, while the selectivity towards the normal cell line is 9–14 fold higher.

A series of new isatin-3-hydrazones bearing different ammonium fragments was synthesized by a simple and easy work-up reaction of Girard’s reagents analogs with 1-(3,5-di-tert-butyl-4-hydroxybenzyl)isatin. All derivatives have been shown to have antioxidant properties. In terms of bactericidal activity against gram-positive bacteria, including methicillin-resistant strains of Staphylococcus aureus, the best compounds are 3a, 3e, and 3m, bearing octyl, acetal, and brucine ammonium centers, respectively. In addition, brucine and quinine derivatives 3l, and 3j exhibit platelet antiaggregation activity at the level of acetylsalicylic acid, and this series of isatin derivatives does not adversely affect the hemostasis system as a whole. Thus, all the obtained results can lay the groundwork for future pharmaceutical developments for the creation of effective antibacterial drugs with reduced systemic toxicity due to the presence of antioxidant properties.

Alkylation reactions of α-carboxylate phosphabetaines were carried out and studied to enhance the biological activity of previously synthesized carboxylate phosphabetaines. As a result of these reactions, the original structure was destroyed with the formation of quaternary salts of phosphonium triiodide. The structure and composition were confirmed by a complex of physical research methods, including NMR, IR spectroscopy, and elemental analysis. The bactericidal and antimycotic activity of the synthesized salts was assessed. The compounds showed activity similar to that of commercial drugs. The reactions of complexation of these structures were also investigated. In the reactions with nickel and copper chloride, complexes were isolated and characterized. The structure of the nickel complex was unambiguously confirmed by the data obtained with the help of single-crystal X-ray diffraction analysis.

Chronic diseases, notably cancer, pose a significant global threat to human life. Oncologists and medical professionals addressing malignancies confront challenges such as toxicity and multidrug resistance. To tackle these issues, the focus has shifted toward the employment of multifunctional colloidal gold nanoparticles. This study aims to design pH-sensitive doxorubicin-loaded gold nanoparticles using polyvinylpyrrolidone. The cytotoxic efficacy of the designed gold nanoarchitecture and its doxorubicin counterpart was assessed in an in vitro model using the HeLa cell. In comparison to the free drug, experimental evaluations showed that the gold nanoarchitecture outperformed significantly lower unspecific drug leaching and efficiently delivered the payload in a controlled manner, boosting the chemotherapy outcomes. This work opens a streamlined approach for engineering gold nanoarchitecture that could be further expanded to incorporate other therapeutics and/or functional moieties that require optimized controlled delivery, offering a one-size-fits-all solution and paving the revolutionary adjustments to healthcare procedures.