Figure 5 - uploaded by Mohammed Belbachir
Content may be subject to copyright.
Source publication
Context in source publication
Citations
... An ultrasonic frequency of 50 Hz with an ultrasonic power of 330 W for 50 min at 60°C temperature was used. 63 Extraction of ginsenosides from flower buds of Panax ginseng, 64 pectin from pistachio 65 and eggplant, 66 phenolic compounds from Citrus aurantium, 67 essential oils from clove, 68 caffeine from guarana seeds 69 and phenolic compounds from Punica granatum 70 was also conducted under the influence of ultrasound. The ultrasonic applications in the extraction process and their yields are summarized in Table 2. ...
Ultrasound waves are sound waves with frequencies higher than the human audible frequencies and application of these waves in biomedical science is explored in this article. A novel approach that involved the use of ultrasound was discovered in around 1950 and since then, it is experimented on to obtain various applications like gene/drug delivery, diagnosis, theranostics, tissue engineering, etc. Ultrasound waves are sound waves travelling at frequencies above human audible frequencies and are further classified into three types: high frequency, medium frequency and low frequency, each showing different therapeutic applications. Ultrasound has shown its application in various fields like dentistry, wastewater management, etc. Apart from therapeutic use, ultrasound is also implemented in synthesis, extraction, tissue engineering, gene delivery and many more applications. This article mentions the recent applications of ultrasound as a non-invasive route for the treatment of several diseases also due to its enhanced penetration of cells which helped greatly in the delivery of drugs/genes, in the extraction of various essential biological components from plants, in the synthesis of several compounds, in the field of theranostics – a combination of diagnosis and therapy, in tissue engineering, etc.
... In addition, when mica is added into polyimide matrix as a filler, the dielectric constant of polyimide/mica hybrid film declined. And the multilayer structured mica would disturb the polarization of the hybrid (11). Another method is adding conductive fillers to improve the dielectric properties of the composite (12)(13)(14). ...
In this work, strontium titanate (STO) was coated on the surface of carbon nanotubes (MWCNTs) through a sol–gel method to form a core–shell structure hybrid powder (STO@MWCNTs). This powder was then added to polydimethylsiloxane to prepare a flexible high-K composite. As coating, STO effectively prevents the overlap and agglomeration of MWCNTs, thereby passivating the percolation threshold of the composite. STO increases the dielectric properties of the composite as a high dielectric ceramic. Under a low filler loading amount of 11 wt%, the dielectric constant and dielectric loss of the composite are 53 and 0.1, respectively. In addition, the composite can still maintain superior breakdown strength and mechanical properties, given the relatively low filler concentration. The enhanced dielectric properties, breakdown strength, and tensile strength make the composite suitable for application as dielectric material in flexible and stretchable energy storage equipment.
Lithium-ion batteries, as an excellent energy storage solution, require continuous innovation in component design to enhance safety and performance. In this review, we delve into the field of eco-friendly lithium-ion battery separators, focusing on the potential of cellulose-based materials as sustainable alternatives to traditional polyolefin separators. Our analysis shows that cellulose materials, with their inherent degradability and renewability, can provide exceptional thermal stability, electrolyte absorption capability, and economic feasibility. We systematically classify and analyze the latest advancements in cellulose-based battery separators, highlighting the critical role of their superior hydrophilicity and mechanical strength in improving ion transport efficiency and reducing internal short circuits. The novelty of this review lies in the comprehensive evaluation of synthesis methods and cost-effectiveness of cellulose-based separators, addressing significant knowledge gaps in the existing literature. We explore production processes and their scalability in detail, and propose innovative modification strategies such as chemical functionalization and nanocomposite integration to significantly enhance separator performance metrics. Our forward-looking discussion predicts the development trajectory of cellulose-based separators, identifying key areas for future research to overcome current challenges and accelerate the commercialization of these green technologies. Looking ahead, cellulose-based separators not only have the potential to meet but also to exceed the benchmarks set by traditional materials, providing compelling solutions for the next generation of lithium-ion batteries.
Nowadays lithium-ion batteries are widely used in many electrical equipments. Separators are a key component in lithium-ion batteries (LIBs) and perform an important role in the performance and safety of batteries. Weak wettability and termal resistance of polyolefine separators cause to limit their efficiency in LIBs. In the current research, the surface of a commerical PP separator was modified by polyvinyl alcohol (PVA)-SiO2 coating layer using the electrospining method. Gurley test was conducted to obtain the permability of the designed separators. Surface tension, viscosity and electrical conductivity of the electrospining solution were also measured. The electrospining parameters (concentration of PVA and SiO2, voltage and time) were optimized via an experimental design. The obtained results showed that, the shrinkage was minimized for the solution of 7.5wt%PVA-15wt%SiO2 which was fabricated at 16.7 kV for 1.5 h. It was revealed that addition of SiO2 nanoparticles as well as incraesing the concentration of the electrospining solution led to increase in viscosity and surface tension of separators. Si–O-Si absorbtion peaks were appeared in FTIR spectrum of PVA-SiO2 fibers compared to PVA fibers. Addition of 20 wt% SiO2 nanoparticles to 12 wt% PVA solution increased the elecrical conductivity from 712 μm to 725 μm. The discharge rate capability results showed that the optimized coated separator had the ability to deliver 61% of initial capacity while the pristine separator delivered 41%, at the same C-rate. Finally the optimized coated separator exhibited the capacities retention of 93% with respect to 87% for pristine separator after 50 cycles.
