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Liu, Rong; Wang, C.H.; Bathgate, R.G.

doi:10.1023/a:1018682914979

Cited by 12 publications

(2 citation statements)

References 20 publications

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“…The effectiveness of the process of grinding raw materials depends on understanding the mechanisms of fragmentation of shell structures, in particular, by brittle fracture of the material near closable defects [ 39 , 40 , 41 , 42 , 43 , 44 , 45 ]. In particular, article [ 39 ] considers the problem of shelling a mass of nuts under the press plate.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effect of Thermal Activation on the Structure and Electrochemical Properties of Carbon Material Obtained from Walnut Shells

Ivanichok,

Kolkovskyi,

Ivanichok

et al. 2024

Materials

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A simple activation method has been used to obtain porous carbon material from walnut shells. The effect of the activation duration at 400 °C in an atmosphere with limited air access on the structural, morphological, and electrochemical properties of the porous carbon material obtained from walnut shells has been studied. Moreover, the structure and morphology of the original and activated carbon samples have been characterized by SAXS, low-temperature adsorption porosimetry, SEM, and Raman spectroscopy. Therefore, the results indicate that increasing the duration of activation at a constant temperature results in a reduction in the thickness values of interplanar spacing (d002) in a range of 0.38–0.36 nm and lateral dimensions of the graphite crystallite from 3.79 to 2.52 nm. It has been demonstrated that thermal activation allows for an approximate doubling of the specific SBET surface area of the original carbon material and contributes to the development of its mesoporous structure, with a relative mesopore content of approximately 75–78% and an average pore diameter of about 5 nm. The fractal dimension of the obtained carbon materials was calculated using the Frenkel–Halsey–Hill method; it shows that its values for thermally activated samples (2.52, 2.69) are significantly higher than for the original sample (2.17). Thus, the porous carbon materials obtained were used to fabricate electrodes for electrochemical capacitors. Electrochemical investigations of these cells in a 6 M KOH aqueous electrolyte were conducted by cyclic voltammetry, galvanostatic charge/discharge, and impedance spectroscopy. Consequently, it was established that the carbon material activated at 400 °C for 2 h exhibits a specific capacity of approximately 110–130 F/g at a discharge current density ranging from 4 to 100 mA/g.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Effect of Thermal Activation on the Structure and Electrochemical Properties of Carbon Material Obtained from Walnut Shells

Ivanichok,

Kolkovskyi,

Ivanichok

et al. 2024

Materials

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Microcompartments with Strong and Dynamic Self‐Repairing Shells

Moore

Moser

Rühs

et al. 2018

Adv Materials Inter

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Microcompartments are useful for the storage, controlled reaction, and release of active compounds. However, the useful lifetime of a microcompartment is generally ended when it ruptures. Here, a self‐repairing microcompartment is proposed whose dynamic polymer shell can seal after rupturing, thus extending the lifetime of the capsule and allowing for multiple mechanically‐stimulated release events. The dynamic polymer shell is created in a one‐step approach through the formation of a double network polymer in the oil phase of a double emulsion template made by microfluidics. Of the two networks, a permanently‐crosslinked network is introduced to elastically restore the shape of the microcompartment, while a dynamically‐crosslinked network forms new bonds across crack interfaces. By quantifying the timescales required for the formation of new dynamic bonds within ruptured shells, strong microcompartments with predictable strength recovery and self‐repairing capabilities are successfully prepared and used to demonstrate the possibility of mechanically‐stimulated multiple release of cargo molecules.

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