Effects of mechanical deformation: Exoemission

Mukhopadhyay, Goutam

doi:10.1007/bf02744002

Cited by 8 publications

(2 citation statements)

References 73 publications

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“…This can also result in the PTSE maxima. [25] Thermal destruction of vacancy-interstitial pair defects in Al 2 O 3 can begin already at temperatures above 100 C. [26][27][28] In addition, photostimulation of the oxide during exoelectron emission measurements can further recharge point defects and lead to the delocalization of electrons. [29] Surface morphology of the films after heating was analyzed using SEM.…”

Section: Resultsmentioning

confidence: 99%

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Romanova

More-Chevalier

Novotný

et al. 2021

Physica Status Solidi (b)

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The thermal stability of black aluminum (Black Al) films deposited on unheated fused silica substrates by pulsed DC magnetron sputtering is investigated. The deposited films have porous moth‐eye morphology and a relatively soft surface that can be easily damaged mechanically. Photothermally stimulated exoelectron emission (PTSE) spectra of the films have emission peaks at 180 and 300 °C, which can be associated with processes of aluminum recrystallization occurring at these temperatures. The total emitted charge of PTSE decreases according to a power law with each subsequent heating, indicating that the most pronounced structural changes on the film surface occur during its first annealing. The shape of the mechanically intact pores of the films does not change after heating. However, spiral‐shaped aluminum nanowires grow from scratches and abrasions on the film surface already after heating up to 200 °C due to the stress‐induced migration of aluminum atoms. When scratches are deliberately applied to the surface of an already annealed film, the nanowires do not grow when the film is reheated. The results of this study show that mechanically intact as‐deposited Black Al films are thermally stable up to temperatures of at least 400 °C.

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Section: Resultsmentioning

confidence: 99%

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Romanova

More-Chevalier

Novotný

et al. 2021

Physica Status Solidi (b)

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show abstract

“…Mechanical degradation mechanisms are mostly associated with volume changes and stress generated during Li de/-intercalation in an active material (i.e., cathode or anode). As a result of volume changes and stress generated, active particles may form cracks, lose contact from each other or the current collector, and become isolated [21][22][23]. In addition, it was shown that stress generated during cycling of a battery alters the pore structure of a separator and results in lower Li ion mobility [24,25].…”

Section: Introductionmentioning

confidence: 99%

Probing the aging effects on nanomechanical properties of a LiFePO4 cathode in a large format prismatic cell

Demirocak

Bhushan

2015

Journal of Power Sources

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Li-ion batteries offer great promise for the future of energy storage due to their superior gravimetric and volumetric energy density. One of the challenges in promoting their expanded use is to improve the cycle life of Li-ion batteries. This requires detailed understanding of the aging phenomenon. The aging mechanism of Li-ion batteries can have both chemical and mechanical origins. While the chemical degradation mechanisms have been studied extensively, mechanical degradation mechanisms have received little attention so far. In this study, we probe the changes in mechanical properties of a LiFePO 4 cathode in a large format prismatic cell. Results indicate that mechanical degradation increases by aging; in addition, local degradation is observed in the composite cathode. Implications of the degradation in mechanical properties on binder degradation are discussed in detail.

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Survey of the literature on mechanoluminescence from 1605 to 2013

2014

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Mechanoluminescence (ML) is a type of luminescence induced by any mechanical action on solids. The light emissions induced by elastic deformation, plastic deformation and fracture of solids are called elastico ML (EML), plastico ML (PML) and fracto ML (FML), respectively. Whereas nearly 50% of all organic molecular solids and inorganic salts exhibit FML, only a few solids exhibit EML and PML. The EML and FML of certain solids are so intense that they can be seen during daylight with the naked eye. Mechanolumnescence has a great potential for use in different types of mechano-optical devices such as stress sensors, damage sensors, impact sensors, fracture sensors and safety management monitoring systems. This article reports a survey of the literature from 1605 to 2013. Mechanoluminescence is studied by physicists, chemists, material scientists, geologists, medical scientists, engineers and technologists, among others and researchers will certainly benefit from the literature survey on ML given here. In addition, the field of mechanoluminescence may attract the interest of many new researchers.

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Effects of mechanical deformation: Exoemission

Cited by 8 publications

References 73 publications

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Thermal Stability of Black Aluminum Films and Growth of Aluminum Nanowires from Mechanical Defects on the Film Surface during Annealing

Probing the aging effects on nanomechanical properties of a LiFePO4 cathode in a large format prismatic cell

Survey of the literature on mechanoluminescence from 1605 to 2013

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