Carboxylic acid mediated green synthesis of copper nanoparticles for multifaceted applications in textile
저자
발행사항
Seoul : Sungkyunkwan University, 2022
학위논문사항
Thesis (Ph.D.)-- Sungkyunkwan University : Department of Advanced Materials Science and Engineering 2022. 2
발행연도
2022
작성언어
영어
주제어
발행국(도시)
서울
형태사항
vii, 123 p. : ill., charts ; 30 cm
일반주기명
Adviser: Dae Ho Yoon
Includes bibliographical reference(p. 100-123)
UCI식별코드
I804:11040-000000167722
DOI식별코드
소장기관
Copper nanoparticles are of great interest to researchers due to their diverse applications ranging from electronics to strong disinfectants. The importance of copper nanoparticles has also increased recently with the findings that the corona virus (COVID-19) has a minimum disinfectant life on copper surfaces. However, their synthesis involves the utilization of toxic reducing agents along with the production of numerous by-products that are equally harmful to human beings and the environment. Owing to the increased environmental awareness the green synthesis including biosynthesis of nanoparticles is widely investigated. However, the poor reduction power of natural extract is a big challenge that limits the large-scale adaptation of biosynthesis. Considering the importance of green processing, efforts were made to explore the effective synthesis of stable copper nanoparticles through both chemical and biogenic methods without meditation of any toxic reagent and explore their dynamic applications in health care, electronic, and textiles.
For biogenic green synthesis, we propose a facile, one-step synthesis and capping of copper nanoparticles using cinnamon bark extract as a potential non-toxic natural reducing cum stabilizing agent. Citric acid, mediation was used in the synthesis process to promote reducing action of cinnamon along with modifying the surface morphology of as-synthesized nanoparticles. The as-synthesized citric acid-mediated nanoparticles presented a uniform spherical morphology with consistent surface texture. The catalytic performance of as-synthesized copper nanoparticles against mutagenic methylene blue (MB) and methyl orange (MO) dyes were evaluated using sodium hypophosphite (SHP) with above 80% of color degradation not reported previously. For green chemical synthesis, sodium hypophosphite was explored as a nontoxic reducing agent along with citric acid (CA) mediation. The carboxylic group in citric acid acts as a capping cum dispersing agent. The absorption of citrate ions on copper reduces the free surface energy of the CuNPs and consequently prevents the growth of nanoparticles and oxidation. Further, considering the importance of copper metallic nanoparticles in printable circuits and electronics, the as-prepared citrate-capped copper nanoparticles were comprehensively explored and optimized for the fabrication of oxidation stable flexible conductive film. Sodium alginate paste made hydrazine water was used as a sintering aid to make the film conductive at low heating temperature. The achieved resistivity of 74.4 ± 9 × 10−2 μΩ m is way better than reported in literature considering ambient air sintering under 60 ○C with improved adhesion. Persistent current flow even after 2500 bending cycles (not reported before) shows the exceptional mechanical stability of our film against bending, while the utilization of facial screen-printing fabrication technology made the process commercially viable and cost-effective.
Clothing is an essential human need that must fulfill the purpose of protecting against the weather in addition to satisfying the functional and aesthetic needs without sacrificing serviceability and comfort. The escalating awareness about personal hygiene and environmental concerns, especially in the current frenzied world with a pandemic, has generated a huge demand for multifunctional, ironing-free clothing with impeccable hygiene while maintaining the true spirit of sustainability in all three aspects i.e. performance, chemical, and process domains. We demonstrated copper nanoparticles induced trimesic acid grafted cellulose as a sustainable solution for multifunctional easy-care clothing. Our treated fabric presents a crease recovery angle value of 248° comparable to that of most promising citric acid-based cross-linkers at the chemical concentration of trimesic acid as low as 2% with a sweeping improvement of around 30% in strength retention, not reported earlier. The relatively low fabric stiffness, without any yellowing, is contributing to the comfort and aesthetic demand while nanoparticles induction promotes utmost antimicrobial need. Furthermore, environmental, health and safety mapping comparison provide a better understanding of the intensity of hazards that different finishing crosslinkers pose on the environment and public health. Functional copper oxide (Cu2O) nanoparticles being p-type semiconductors with low band gap are also attaining attention for their multiple functional aspects in textile (e.g., photocatalysis, antimicrobial, self-cleaning) while their plasmonic resonance in the visible spectrum is interesting to impart color aesthetics. Lastly, taking in account the advantages of Cu2O properties, a sustainable process for one-step coloration and functionalization of cotton fabric was developed through an in-situ synthesis of cross-linkable functional Cu2O nano-cubes. Citric acid was introduced as a bio-organic linker to functionalize the Cu2O nanoparticles. The nano-cubes to fabric interaction were established through FTIR spectroscopy while synthesis of Cu2O has been recognized through XRD and XPS analysis. Our as-prepared nano-dyed fabric presents extended biological and chemical self-cleaning along with ease of utilization subjected to easy care and comfort attributes. Further, a simple and cost-effective synthesis route through the conventional pad-dry-pad-cure method facilitates the cutting-edge benefits of rapid industrial adoption. while the absolute absence of toxic reagents will open new horizons of developmental processes and applications in the hygienic and healthcare sustainable textile domain.
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