Size-dependent decomposition temperature of nanoparticles: A theoretical and experimental study

Wang, Shanshan; Cui, Zixiang; Xia, Xiaoyan; Xue, Yongqiang

doi:10.1016/j.physb.2014.07.058

Cited by 16 publications

(11 citation statements)

References 17 publications

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“…The ionic strength of CdS with different particle sizes and different temperatures were calculated using eqn (19), and the results are shown in Table S5 (ESI †). Substituting the value of calculated ionic strength in eqn (20), the average ionic activity coefficients of CdS with different particle sizes are calculated, and the results are shown in Table 3.…”

Section: Influence Of Particle Size On the Standard Dissolution Equil...mentioning

confidence: 99%

“…12,13 Due to the difference in surface atomic distribution structure, when the particle size is reduced to the level of a nanometer, it will lead to nanomaterials being compared with those of corresponding bulk materials, the chemical and physical properties would become particularly prominent. [14][15][16] When nanomaterials reacted, such as in adsorption, 17 phase transitions, 18,19 decompositions, [20][21][22] and other processes, the difference mainly depends on the surface thermodynamic properties of nanomaterials. Meanwhile, the surface thermodynamic properties of nanomaterials also affect their activity.…”

Section: Introductionmentioning

confidence: 99%

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Critical size effect for the surface heat capacities of nano-CdS: theoretical and experimental studies

Zhang

Tan

Zhou

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Influence Of Particle Size On the Standard Dissolution Equil...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical size effect for the surface heat capacities of nano-CdS: theoretical and experimental studies

Zhang

Tan

Zhou

et al. 2022

Phys. Chem. Chem. Phys.

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“…52 The presence of CaCO 3 is supported by the FT-IR spectra of the three samples in Fig. Considering the chemical compositions of the samples and the temperature range, the weight loss can be accounted for by a possible presence of CaCO 3 which can be formed by adsorption of atmospheric CO 2 and subsequent carbonation of the strong basic sites on calcium species within the pores.…”

Section: Resultsmentioning

confidence: 81%

Calcium-modified hierarchically porous aluminosilicate geopolymer as a highly efficient regenerable catalyst for biodiesel production

et al. 2015

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A new class of highly active solid base catalysts for biodiesel production was developed by creating hierarchically porous aluminosilicate geopolymer with affordable precursors and modifying the material with varying amounts of calcium. For the catalysts containing $8 wt% Ca, almost 100% conversion has been achieved in one hour under refluxing conditions with methanol solvent, and the high catalytic activity was preserved for multiple regeneration cycles. Temperature-programed desorption studies of CO 2 indicate that the new base catalyst has three different types of base sites on its surface whose strengths are intermediate between MgO and CaO. The detailed powder X-ray diffraction (PXRD) and Xray photoelectron spectroscopic (XPS) studies show that the calcium ions were incorporated into the aluminosilicate network of the geopolymer structure, resulting in a very strong ionicity of the calcium and thus the strong basicity of the catalysts. Little presence of CaCO 3 in the catalysts was indicated from the thermogravimetric analysis (TGA), XPS and Fourier transform infrared spectroscopy (FT-IR) studies, which may contribute to the observed high catalytic activity and regenerability. The results indicate that new geopolymer-based catalysts can be developed for cost-effective biodiesel production.

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“…Observations on common rock-forming minerals are scarcer. However, in the case of calcite, which is the dominant constituent of limestone, the decomposition temperature decreases from~1075 K to 950 K as the grain size decreases from 40 nm to 20 nm [68] (Figure 2b). Size-dependence of the melting or decomposition temperature of fault rock within a principal slip zone (PSZ) may have major implications for bulk fault rheology, for example at elevated temperatures due to frictional heating.…”

Section: The Physical Properties Of Nanophase Materialsmentioning

confidence: 99%

“…The fraction of surface particles increases near-exponentially with decreasing number of outer shells, or particle size (after [11,13]). (b) The melting temperature of Au [67] and the decomposition temperature of CaCO 3 [68] particles decrease sharply as particle size decreases within the nm-realm. (c) The cumulative surface area of polycrystals increases exponentially as the grain size continues to decrease.…”

Section: Nanocrystalline Principal Slip Zones In Exposures Of Naturalmentioning

confidence: 99%

Nanocrystalline Principal Slip Zones and Their Role in Controlling Crustal Fault Rheology

2019

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Principal slip zones (PSZs) are narrow (<10 cm) bands of localized shear deformation that occur in the cores of upper-crustal fault zones where they accommodate the bulk of fault displacement. Natural and experimentally-formed PSZs consistently show the presence of nanocrystallites in the <100 nm size range. Despite the presumed importance of such nanocrystalline (NC) fault rock in controlling fault mechanical behavior, their prevalence and potential role in controlling natural earthquake cycles remains insufficiently investigated. In this contribution, we summarize the physical properties of NC materials that may have a profound effect on fault rheology, and we review the structural characteristics of NC PSZs observed in natural faults and in experiments. Numerous literature reports show that such zones form in a wide range of faulted rock types, under a wide range of conditions pertaining to seismic and a-seismic upper-crustal fault slip, and frequently show an internal crystallographic preferred orientation (CPO) and partial amorphization, as well as forming glossy or "mirror-like" slip surfaces. Given the widespread occurrence of NC PSZs in upper-crustal faults, we suggest that they are of general significance. Specifically, the generally high rates of (diffusion) creep in NC fault rock may play a key role in controlling the depth limits to the seismogenic zone.In this paper, we aim to elucidate the significance of nanocrystalline PSZs in Earth's upper crust. We start with background on fault mechanics and upper-crustal seismogenesis, and summarize some key physical properties of nanophase materials which, when applied to fault rock, are expected to be of major importance in controlling fault strength and stability. We go on to review the micro-and nanostructural characteristics of natural and experimentally-formed nanocrystalline PSZs, and list reports from the literature of PSZs characterized by grains <100 nm in size. Our work demonstrates that nanocrystalline PSZs form under a wide range of conditions pertaining slow (a-seismic) and fast (co-seismic) upper-crustal fault slip. Also, we observe that they are frequently characterized by an internal crystallographic preferred orientation, and by the presence of amorphous materials and/or glossy fault plane interfaces known as "mirror-slip" surfaces. Given the abundant observations of nanocrystalline PSZs in field exposures of faults, as well as in experiments, we suggest that they are of general importance to upper-crustal fault deformation. The physical properties of nanocrystalline fault rock may play a key role in natural earthquake cycles, especially in controlling the depth distribution of upper-crustal seismicity. Fault Zones, Earthquakes, and the Seismogenic ZoneThe presence of long-lived, localized zones of shear deformation in the crust, or fault zones, implies that the fault rocks within are weaker than the surrounding country rocks and that their weakness is persistent [14,15]. The strength of the upper-crust is classically approximated using a Cou...

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Size-dependent decomposition temperature of nanoparticles: A theoretical and experimental study

Cited by 16 publications

References 17 publications

Critical size effect for the surface heat capacities of nano-CdS: theoretical and experimental studies

Critical size effect for the surface heat capacities of nano-CdS: theoretical and experimental studies

Calcium-modified hierarchically porous aluminosilicate geopolymer as a highly efficient regenerable catalyst for biodiesel production

Nanocrystalline Principal Slip Zones and Their Role in Controlling Crustal Fault Rheology

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