Inorganic and methane clathrates: Versatility of guest–host compounds for energy harvesting

Krishna, Lakshmi; Koh, Carolyn A.

doi:10.1557/mre.2015.9

Cited by 17 publications

(8 citation statements)

References 81 publications

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“…Quantum chemistry calculations beyond density functional theory also indicated that the formation of these clathrates is energetically favorable 16 . However, despite the high promise and predicted high stability, experimental synthesis of these inert gas inorganic clathrate has not been reported 17 .…”

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confidence: 99%

Formation of inclusion type silicon phases induced by inert gases

Strobel

et al. 2018

Commun Chem

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Silicon clathrate, an important allotrope of silicon, has attractive opto-electronic properties for energy applications. However, it remains an experimental challenge to synthesize electrically undoped, intrinsic clathrate. Here we show, through high-throughput computer modeling, that unconventional silicon phases spontaneously nucleate from liquid silicon in the presence of noble gases under high pressure and high temperature. In particular, our results show that a medium-sized noble gas, for example, argon, can trigger the nucleation and growth of inert-gas silicon clathrate, whereas a small noble gas such as helium is able to induce the formation of an unconventional, inclusion-type compound Si 2 He. The formation of both silicon phases can be attributed to the same thermodynamic and kinetic rationale that explains the crystallization of clathrate hydrate, an isostructural analog. Our findings, along with the gained molecular insights, thus strongly suggest a viable experimental synthesis route for these silicon phases using noble gases at high pressure.

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confidence: 99%

Formation of inclusion type silicon phases induced by inert gases

Strobel

et al. 2018

Commun Chem

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“…2−4 There are two main types of applications for these materials: optoelectronics 5 and batteries. 6 In the first case, the Na x Si 136 type II binary clathrate structure presents semiconducting properties and is able to reach a 1.9 eV quasi-direct bandgap. 7 Furthermore, the material presents the advantage of a direct bandgap as opposed to conventional diamond silicon.…”

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confidence: 99%

Silicon Clathrate Films for Photovoltaic Applications

et al. 2020

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Silicon clathrates are allotropes of silicon that show great promises for optoelectronics and batteries.However silicon clathrates in the form of films are relatively new and devices based on this material still have to be engineered. In this work we present a protocol for silicon clathrates film fabrication that does not necessitate a glove box. We show that dense films can be obtained with a pressure annealing treatment and that the films can be measured by atomic force microscopy. Ion implantation of P, B and As is performed on the clathrate films. Early photovoltaic devices are presented, with a maximum short circuit current density of 0.11 mA/cm².

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“…Among the unique features of hydrates are; they are not chemical compounds and are non-stoichiometric crystals [6,7]. Due to no strong chemical bonds exist between the gas and water molecules [8], there is potential of the gas molecules to be released from the water molecules cage [9], which contributes to the flow assurance issues. The three most common gas hydrates structures are structure I (sI), structure II (sII), and structure H (sH), which differs in cage size and physical shape.…”

Section: Introductionmentioning

confidence: 99%

Review on Application of Quaternary Ammonium Salts for Gas Hydrate Inhibition

Hussain

Husin

2020

Applied Sciences

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Gas hydrate solids occurrence is considered as one of the serious challenges in flow assurance as it affects the hydrocarbon production significantly, especially in deep water gas fields. The most cost-effective method to inhibit the formation of hydrate in pipelines is by injecting a hydrate inhibitor agent. Continuous studies have led to a comprehensive understanding on the use of low dosage hydrate inhibitors such as ionic liquid and quaternary ammonium salts which are also known as dual function gas hydrate inhibitors. This paper covers the latest types of quaternary ammonium salts (2020–2016) and a summary of findings which are essential for future studies. Reviews on the effects of length of ionic liquids alkyl chain, average suppression temperatures, hydrate dissociation enthalpies, and electrical conductivity to the effectiveness of the quaternary ammonium salts as gas hydrate inhibitors are included.

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Inorganic and methane clathrates: Versatility of guest–host compounds for energy harvesting

Abstract: ABSTRACT

Cited by 17 publications

References 81 publications

Formation of inclusion type silicon phases induced by inert gases

Formation of inclusion type silicon phases induced by inert gases

Silicon Clathrate Films for Photovoltaic Applications

Review on Application of Quaternary Ammonium Salts for Gas Hydrate Inhibition

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