Thermodynamic Description of the Al–X (X = S, Se, Te) Systems

Shi, Chenying; Yang, Bingchu; Hu, Biao; Du, Yong; Yao, Sheng

doi:10.1007/s11669-019-00733-z

Cited by 8 publications

(12 citation statements)

References 35 publications

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“…On the other hand, the discrepancy between the patterns of dust and water measurements is less intuitive. Water outgassing is the dominant driver of dust activity from the northern hemisphere (De Sanctis et al 2015a;Shi et al 2018a), prior to the observations analysed here (days before Northern autumn equinox). The deviation of water production from the variation of illuminated cross section, in particular, suggests that the nucleus surface is not homogeneously active as presented by Marschall et al (2019).…”

Section: Gas Production Rate Derived From Virtis-m Datamentioning

confidence: 79%

“…Observations of dust 'jets' have been traced to certain areas of the surface (Vincent et al 2016), and various models have been developed to trace gas and dust flow in the inner coma of 67P, with varying degrees of complexity (e.g., Fougere et al 2016a;Kramer & Noack 2016;Kramer et al 2017;Zakharov et al 2018), but these do not yet uniquely identify the surface features responsible for activity. Indeed, many of the models show that the bulk activity can be explained by moreor-less homogeneous activity from all illuminated surface facets (Keller et al 2015), and that jets in the inner coma are controlled more by the complex shape of the nucleus than by anything special about their apparent source on the surface (Shi et al 2018a). Yet, there are clear variations in activity with seasonal illumination of the comet, which appear to be related to the very different morphology of the Northern and Southern surfaces, and models that explain the early activity seen by Rosetta when 67P was far from the Sun do not reproduce the perihelion behaviour (Shi et al 2018b).…”

Section: Introductionmentioning

confidence: 99%

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Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta

Tubiana

Rinaldi

Güttler

et al. 2019

A&A

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Context. On 27 April 2015, when 67P/Churyumov-Gerasimenko was at 1.76 au from the Sun and moving towards perihelion, the OSIRIS and VIRTIS-M instruments on board Rosetta simultaneously observed the evolving dust and gas coma during a complete rotation of the comet. Aims. We aim to characterize the dust, H 2 O and CO 2 gas spatial distribution in the inner coma. To do this we performed a quantitative analysis of the release of dust and gas and compared the observed H 2 O production rate with the one calculated using a thermo-physical model. Methods. For this study we selected OSIRIS WAC images at 612 nm (dust) and VIRTIS-M image cubes at 612 nm, 2700 nm (H 2 O emission band) and 4200 nm (CO 2 emission band). We measured the average signal in a circular annulus, to study spatial variation around the comet, and in a sector of the annulus, to study temporal variation in the sunward direction with comet rotation, both at a fixed distance of 3.1 km from the comet centre.Results. The spatial correlation between dust and water, both coming from the sun-lit side of the comet, shows that water is the main driver of dust activity in this time period. The spatial distribution of CO 2 is not correlated with water and dust. There is no strong temporal correlation between the dust brightness and water production rate as the comet rotates. The dust brightness shows a peak at 0 • sub-solar longitude, which is not pronounced in the water production. At the same epoch, there is also a maximum in CO 2 production. An excess of measured water production, with respect to the value calculated using a simple thermo-physical model, is observed when the head lobe and regions of the Southern hemisphere with strong seasonal variations are illuminated (sub-solar longitude 270 • -50 • ). A drastic decrease in dust production, when the water production (both measured and from the model) displays a maximum, happens when typical Northern consolidated regions are illuminated and the Southern hemisphere regions with strong seasonal variations are instead in shadow (sub-solar longitude 50 • -90 • ). Possible explanations of these observations are presented and discussed.

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Section: Gas Production Rate Derived From Virtis-m Datamentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta

Tubiana

Rinaldi

Güttler

et al. 2019

A&A

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“…As previously mentioned, aluminum chalcogenides, specifically sulfides and tellurides, present different stoichiometries in dependence of the experimental conditions used for preparing them. [ 185 ] Pressure might have a primary role for the formation of even more exotic structures, which have been, for the moment, predicted by calculations. [ 186 ] However, despite the fragmented arguments for the description of one of structures of Al–Q systems, a systematization of the relevant structures deriving from the phase diagrams is partially missing.…”

Section: Aluminum Chalcogenidesmentioning

confidence: 98%

Section: Synthesismentioning

confidence: 99%

A New, Thorough Look on Unusual and Neglected Group III‐VI Compounds Toward Novel Perusals

Guzzetta

Jellett

Azadmanjiri

et al. 2023

Small

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been permitted. [4][5][6][7] Although, the employment of 2D nanosheets, especially in biomedicine, is still in its primordial state and has permitted to the realization of novel advancements in such applications. [8][9][10] It needs to be highlighted that some of these compounds present mild cytotoxicity and dose-dependent induced metabolic disadvantages. [11,12] Albeit direct use in the body is not yet advisable, it is possible to indirectly employ these compounds in the creation of wearable devices for tracking vital parameters. [13] Research on such topics, both from fundamental and applied studies has led to an exponential increase in the number of publications during the last 10 years (Figure 1c). [14] One of the pivotal characteristics of 2D nanostructures is their high specific area-to-thickness ratio, which can be easily modulated through delamination processes. [15] Ultimately, the smallest crystals that can be created are mono-or bi-atomic layers. To understand how the nanocrystals form from bulk, it is important to comprehend the main characteristic features of the macrocrystals. A layered crystal lattice is presented in Figure 2. These crystals are governed by strong, covalent (or ionic) in-plane bonds, which are often arranged into hexagonal honeycombs. These individual sheets are linked together by inter-plane (inter-layer), and weak van der Waals (vdW) forces. The bond energies between the in-plane atoms, are the major contribution on the total energy of the lattice, leaving weak inter-plane interactions with relatively large distances (i.e., about few hundred picometers in graphene). These large inter-planar spaces are suitable attack points for size reduction, [16][17][18] which requires an external energy input from a providing source in order to delaminate single-layer crystals.The in-plane honeycomb structure is responsible for electrical transport and associated phenomena. For instance, the great mobility of p-electrons and their delocalization on the surface allows excellent transport in graphene. [23,24] However, in some other electro-and photoactivated semiconductors based on 2D materials, the electrical transport on the surface is responsible for the hole-electron confinement. [25] It can also produce poor electrical conduction by 2D materials such as hexagonal boron nitride (hBN) and so making them electrical insulators (see Figure 1a). [26] These differences in the layersThe attention on group III-VI compounds in the last decades has been centered on the optoelectronic properties of indium and gallium chalcogenides. These outstanding properties are leading to novel advancements in terms of fundamental and applied science. One of the advantages of these compounds is to present laminated structures, which can be exfoliated down to monolayers. Despite the large knowledge gathered toward indium and gallium chalcogenides, the family of the group III-VI compounds embraces several other noncommon compounds formed by the other group III elements. These compounds present various crystal lattices...

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“…Impressively, against HepG2, A549 and U87MG To develop probes for image-guided surgery, Wang et al recently reported a peptide-based probe for imaging renal cell carcinoma (RCC). 510 As shown in Figure 86C, the peptide, RGDRDDRDDPLGYLGFFC(Cy) (272), consists of a targeting motif, an enzyme cleavable site, and a NIR fluorophore. Specifically, the modular molecular design includes (i) RGD, as a recognition motif, for recognizing the highly expressed αvβ3 integrins in RCC, (ii) PLGYLG, as an enzyme-responsive peptide linker and a substrate to be cleaved by MMP-2/9, (iii) a self-assembly motif (YLGFFC), and (iv) a fluorophore (Cy).…”

Section: Peri/intracellular Ensmentioning

confidence: 99%

Enzymatic Noncovalent Synthesis

et al. 2020

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Enzymatic reactions and noncovalent (i.e., supramolecular) interactions are two fundamental nongenetic attributes of life. Enzymatic noncovalent synthesis (ENS) refers to a process where enzymatic reactions control intermolecular noncovalent interactions for spatial organization of higher-order molecular assemblies that exhibit emergent properties and functions. Like enzymatic covalent synthesis (ECS), in which an enzyme catalyzes the formation of covalent bonds to generate individual molecules, ENS is a unifying theme for understanding the functions, morphologies, and locations of molecular ensembles in cellular environments. This review intends to provide a summary of the works of ENS within the last decade and emphasize ENS for functions. After comparing ECS and ENS, we describe a few representative examples where nature uses ENS, as a rule of life, to create the ensembles of biomacromolecules for emergent properties/functions in a myriad of cellular processes. Then, we focus on ENS of man-made (synthetic) molecules in cell-free conditions, classified by the types of enzymes. After that, we introduce the exploration of ENS of man-made molecules in the context of cells by discussing intercellular, peri/intracellular, and subcellular ENS for cell morphogenesis, molecular imaging, cancer therapy, and other applications. Finally, we provide a perspective on the promises of ENS for developing molecular assemblies/processes for functions. This review aims to be an updated introduction for researchers who are interested in exploring noncovalent synthesis for developing molecular science and technologies to address societal needs.

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Thermodynamic Description of the Al–X (X = S, Se, Te) Systems

Cited by 8 publications

References 35 publications

Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta

Diurnal variation of dust and gas production in comet 67P/Churyumov-Gerasimenko at the inbound equinox as seen by OSIRIS and VIRTIS-M on board Rosetta

A New, Thorough Look on Unusual and Neglected Group III‐VI Compounds Toward Novel Perusals

Enzymatic Noncovalent Synthesis

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