Manganese dioxide nanoparticles: synthesis, application and challenges

Dawadi, Sonika; Gupta, Aakash; Khatri, Manita; Budhathoki, Biplab; Lamichhane, Ganesh; Parajuli, Niranjan

doi:10.1007/s12034-020-02247-8

Cited by 85 publications

(51 citation statements)

References 100 publications

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“…The second paper, published in May 1921, was a short report on a new method to prepare colloidal manganese dioxide (Cuy, 1921a), this one clearly a by-product of his experimental work on hydrazine with Bray. Interestingly, this work was a pioneering study of the preparation of what much later became known as manganese dioxide nanoparticles (MnO 2 NOPs), which are now widely used in medicine, ion exchange, biosensors, molecular adsorption, catalysis and energy storage (Dawadi et al, 2020).…”

Section: Uc Berkeley and The Structure Of The Water Moleculementioning

confidence: 99%

On the centennials of the discoveries of the hydrogen bond and the structure of the water molecule: the short life and work of Eustace Jean Cuy (1897–1925)

Derewenda¹

2021

Acta Cryst Sect A

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The bent structure of the water molecule, and its hydrogen-bonding properties, arguably rank among the most impactful discoveries in the history of chemistry. Although the fact that the H—O—H angle must deviate from linearity was inferred early in the 20th century, notably from the existence of the electric dipole moment, it was not clear what that angle should be and why. One hundred years ago, a young PhD student at the University of California, Berkeley, Eustace J. Cuy, rationalized the V-shape structure of a water molecule using the Lewis theory of a chemical bond, i.e. a shared electron pair, and its tetrahedral stereochemistry. He was inspired, in part, by the proposal of a weak (hydrogen) bond in water by two colleagues at Berkeley, Wendell Latimer and Worth Rodebush, who published their classic paper a year earlier. Cuy went on to suggest that other molecules, notably H2S and NH3, have similar structures, and presciently predicted that this architecture has broader consequences for the structure of water as a liquid. This short, but brilliant paper has been completely forgotten, perhaps due to the tragic death of the author at the age of 28; the hydrogen-bond study is also rarely recognized. One of the most impactful publications on the structure of liquid water, a classic treatise published in 1933 by John Bernal and Ralph Fowler, does not mention either of the two pioneering papers. In this essay, the background for the two discoveries is described, including the brief history of Lewis's research on the nature of the chemical bond, and the history of the discovery of the hydrogen bond, which inspired Cuy to look at the structure of the water molecule. This is – to the best of the author's knowledge – the first biographical sketch of Eustace J. Cuy.

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Section: Uc Berkeley and The Structure Of The Water Moleculementioning

confidence: 99%

On the centennials of the discoveries of the hydrogen bond and the structure of the water molecule: the short life and work of Eustace Jean Cuy (1897–1925)

Derewenda¹

2021

Acta Cryst Sect A

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“…The various structures, corresponding to different chemical and physical properties, have been widely applied in catalysis, batteries, sensors, molecular sieves, energy storage, etc. ( Dawadi et al, 2020 ; Ye et al, 2020 ; Marciniuk et al, 2021 ; Ouyang et al, 2021 ; Wang et al, 2021 ). Particularly, δ-MnO 2 has attracted considerable attention due to its unique layered structure, where its bandgap can be tuned by filling ions between the layers ( Luo et al, 2000 ; Wang et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Enhanced Spontaneous Antibacterial Activity of δ-MnO2 by Alkali Metals Doping

Yan

Jiang

Liu

et al. 2022

Front. Bioeng. Biotechnol.

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Recently, the widespread use of antibiotics is becoming a serious worldwide public health challenge, which causes antimicrobial resistance and the occurrence of superbugs. In this context, MnO2 has been proposed as an alternative approach to achieve target antibacterial properties on Streptococcus mutans (S. mutans). This requires a further understanding on how to control and optimize antibacterial properties in these systems. We address this challenge by synthesizing δ-MnO2 nanoflowers doped by magnesium (Mg), sodium (Na), and potassium (K) ions, thus displaying different bandgaps, to evaluate the effect of doping on the bacterial viability of S. mutans. All these samples demonstrated antibacterial activity from the spontaneous generation of reactive oxygen species (ROS) without external illumination, where doped MnO2 can provide free electrons to induce the production of ROS, resulting in the antibacterial activity. Furthermore, it was observed that δ-MnO2 with narrower bandgap displayed a superior ability to inhibit bacteria. The enhancement is mainly attributed to the higher doping levels, which provided more free electrons to generate ROS for antibacterial effects. Moreover, we found that δ-MnO2 was attractive for in vivo applications, because it could nearly be degraded into Mn ions completely following the gradual addition of vitamin C. We believe that our results may provide meaningful insights for the design of inorganic antibacterial nanomaterials.

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“…Regarding the physic-mechanical properties of panels, new probabilities have arisen with the use of metal nanoparticles. Manganese dioxide (MnO 2 ) nanoparticles have outstanding properties in the fields of electrocatalysis, photo-thermal conversion, electrode materials, and wave absorbing materials, 16 paving the way for the development of functional wood adhesives. Nonetheless, nanoparticles tend to aggregate in the matrix, which greatly weakens the modification effect and even harms the original performance of the resultant adhesive.…”

Section: Introductionmentioning

confidence: 99%

Highly dispersed manganese dioxide nanoparticles anchored on diatomite surface by sol–gel method and its performance on soybean meal‐based adhesive

Jiang

et al. 2021

J of Applied Polymer Sci

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Nanoparticle enhancement has been used as an effective means to improve the performance of biomass adhesives. However, there is an inevitable problem of stress concentration caused by particle agglomeration and thus the adhesive layer is susceptible to damage. Therefore, in this paper, a sol-gel method was used to generate uniformly distributed manganese dioxide (MnO 2 ) nanoparticles on the surface of diatomite (Dia) and used for the modification of soybean meal based wood adhesives. The results showed that MnO 2 nanoparticles have been successfully anchored on the surface of Dia during the sol-gel process without agglomeration. MnO 2 /Dia particles could fill in the adhesive gaps and form hydrogen bonds with soy protein molecules, which ensured that the adhesive wet shear strength was increased by 33% to 0.89 MPa. This study provided an idea for the preparation of highly dispersed nanoparticle reinforced adhesives.

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Manganese dioxide nanoparticles: synthesis, application and challenges

Cited by 85 publications

References 100 publications

On the centennials of the discoveries of the hydrogen bond and the structure of the water molecule: the short life and work of Eustace Jean Cuy (1897–1925)

On the centennials of the discoveries of the hydrogen bond and the structure of the water molecule: the short life and work of Eustace Jean Cuy (1897–1925)

Enhanced Spontaneous Antibacterial Activity of δ-MnO2 by Alkali Metals Doping

Highly dispersed manganese dioxide nanoparticles anchored on diatomite surface by sol–gel method and its performance on soybean meal‐based adhesive

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