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An Overview of Nanotechnology-Based Innovations in Food Packaging
Published in Shiji Mathew, E.K. Radhakrishnan, Nano-Innovations in Food Packaging, 2023
Gemechu Berhanu Kerorsa, Mahendra Pal
Copper nanoparticles have been proven to inhibit the growth of Staphylococcus aureus, L. monocytogenes, E. coli, and Saccharomyces cerevisiae on a polymer combination after 4 h exposure (Cioffi et al., 2005). Copper nanoparticles antibacterial effect against E. coli and Bacillus subtilis in polyurethane nanofibers containing copper nanoparticles. Copper nanoparticles lead to multiple toxic effects that include production of reactive oxygen species, DNA degradation, protein oxidation, and lipid peroxidation, and that may be accountable for its antimicrobial action (Chatterjee et al., 2014). Zinc nanocrystals are used as an antifungal and antimicrobial substances when integrated with the plastic matrix. Distinct nanoparticles oxide(s) consisting of titanium dioxide (TiO2), zinc oxide (ZnO), silicon oxide (SiO2), and magnesium oxide (MgO) also shows utility in food packaging because of their capacity to act as ultraviolet blockers and photocatalytic disinfecting agents. Among all, TiO2 particles have been most promising (Farhoodi, 2016).
Recent Advances in Materials Science and Engineering Contributing to the Infection Diseases
Published in Peerawatt Nunthavarawong, Sanjay Mavinkere Rangappa, Suchart Siengchin, Mathew Thoppil-Mathew, Antimicrobial and Antiviral Materials, 2022
Sabarish Radoor, Aswathy Jayakumar, Jasila Karayil, Jyothi Mannekote Shivanna, Jyotishkumar Parameswaranpillai, Suchart Siengchin
A copper nanoparticle is considered one of the promising candidates for biological applications. Owing to its small size and high surface-to-volume ratio, copper nanoparticles could interact more effectively with microbes and possess good antimicrobial activity [28-29]. Moreover, they contain good mechanical, electrical, and optical properties. Compared with other nanoparticles, the main advantage of copper nanoparticles is their low cost and desirable physicochemical stability. Consequently, copper nanoparticles have received much attention from scientists, and they have been widely used in wound dressing and biocidal properties. Copper nanoparticles can be developed through different routes, such as physical, chemical, and biological. However, due to its environment-friendly nature, the biological route's simplicity and non-toxic nature are more applicable for synthesizing copper nanoparticles [30-31].
Fabrication and Functionalization of Other Inorganic Nanoparticles and Nanocomposites
Published in Vineet Kumar, Praveen Guleria, Nandita Dasgupta, Shivendu Ranjan, Functionalized Nanomaterials I, 2020
Kiranmai Mandava, Uma Rajeswari B.
Among the different metal particles, copper nanoparticles have attracted considerable interest because of their unique physical, chemical, optical, catalytic, mechanical, and electrical properties; moreover, their low-cost preparation has been of great interest recently. Metallic copper is a rather noble material among the elements of group II. Copper is the most abundant material in the Earth’s crust, but at the same time the least stable in its metallic form. The price to properties ratio of this element is excellent and makes it very suitable, in a similar way to silver in large scale applications. Copper nanoparticles possess a wide range of applications in the fields of metallurgy, catalysis, and nano and optoelectronics (Dhas et al., 1998; Vitulli et al., 2002; Zhou, 2004; Quaranta et al., 2004).
Facile, controllable, chemical reduction synthesis of copper nanostructures utilizing different capping agents
Published in Inorganic and Nano-Metal Chemistry, 2020
Mohamed F. El-Berry, Sadeek A. Sadeek, Ahmed M. Abdalla, Mostafa Y. Nassar
The chemical reduction method involves precipitation of copper nanoparticles by reducing a copper precursor in a solution containing a reducing agent.[26–28] During the chemical reaction, copper ions (Mn+) are simply reduced to zero-valent copper atoms (M0) by electrons (ne–) provided by the reducing agent (Red) (Equations (1, 2)). The formation of the zero-valent metal atoms (Mo) is followed by nucleation and then by the growth of particles. Finally, stabilization of copper nanoparticles is performed by using a suitable capping agent.[29]
Green synthesis of copper nanoparticle using ionic liquid-based extraction from Polygonum minus and their applications
Published in Environmental Technology, 2019
Habib Ullah, Cecilia Devi Wilfred, Maizatul Shima Shaharun
Copper nanoparticles have various applications in environmental purification and remediation, food processing, healing ointment and antimicrobial activity. Copper nanoparticles have been synthesised by various techniques such as microemulsion, thermal decomposition, chemical reduction etc. Syntheses of stable Cu NPs are a big challenge because Cu0 undergo rapid oxidation. Biomolecules act as reducing agent and reduce metal ions to nanomaterial. The lignocellulosic biomass extract contains phenolic compounds, which not only act as reducing agent but also capped the nanoparticles which help to reduce the aggregation of NPs, hence control the morphology and stabilise the nanoparticles[14–16].
A fractal–fractional model-based investigation of shape influence on thermal performance of tripartite hybrid nanofluid for channel flows
Published in Numerical Heat Transfer, Part A: Applications, 2023
Talha Anwar, Poom Kumam, Kanokwan Sitthithakerngkiet, Shah Muhammad
The characteristics of graphene, copper, and magnesia nanoparticles make them potentially useful for a variety of industrial and technical applications. For instance, MgO possesses higher thermal conductivity and lower electrical conductivity. It is physically and chemically stable at extreme temperatures because of the aforementioned features. Because of its fire and moisture-resistant properties, it is one of the most basic elements in construction materials. Moreover, MgO is utilized in the medical field to make optical materials and is also used to treat dyspepsia and heartburn. Graphene has become a vital and effective nanomaterial due to its exceptionally high transparency, electrical conductivity, and tensile strength. Graphene has the thinnest structure and it is a flexible conductor with a wide range of applications in materials and devices including touch panels, solar cells, smartphones, and light-emitting diodes. Some other areas of use of graphene involve filtration, photovoltaics, capacitors and batteries, biological engineering, and energy storage. Copper nanoparticles are soft and malleable with very high electrical and thermal conductivity. Copper is one of those rare materials that can naturally occur in a directly usable form. It is an effective conductor of electricity and heat. The fundamental utilities of copper are electrical wires, plumbing and roofing, industrial machines, and renewable energy systems. Copper is also an important part of heat exchangers and heat sinks because of its efficacious heat dissipation characteristics. Realizing these widespread applications and significant physical features of graphene, copper, and magnesia nanoparticles, this work examines their impacts on heat transfer and flow phenomena.