Physikalisch‐chemische Eigenschaften des Fluors

Wicke, E.; Franck, E. U.

doi:10.1002/ange.19540662203

Cited by 12 publications

(2 citation statements)

References 49 publications

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“…at very low salt activity ≈0.1 below the πtransition, then Figure 5a illustrates how the pull off-force is lowered by lowering pH. A possible explanation for this pH-induced decrease could be due to trapping of an excess of hydronium including hydration water in form of H9O4 + Eigen complexes at the collapsed EDL interface [45]. A trivial consequence of this gradual decrease in pull-off force is that the magnitude of the π-transition must be smaller at lower pH.…”

Section: Energy Required Inducing Fttsmentioning

confidence: 96%

Ion specific hydration in nano-confined electrical double layers

Zachariah

Espinosa‐Marzal

Heuberger

2017

Journal of Colloid and Interface Science

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We probe counter-ion specific effects in nano-confined electrical-double-layers (EDLs) by means of direct force measurements across a model slit pore in the extended surface forces apparatus. By variation of solution composition, we compare four different counter-ions with dissimilar hydration properties, namely Na, K, Cs as well as HO, all confined between (001) mica surfaces. We discuss the results in terms of a recently proposed π-transition model, evoking hydrated ion layering as the recurrent structural element in highly confined EDLs. We demonstrate that the π-transition essentially proceeds in multiple steps in coherence with the event of single- or multiple- hydrated-ion layering.

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Section: Energy Required Inducing Fttsmentioning

confidence: 96%

Ion specific hydration in nano-confined electrical double layers

Zachariah

Espinosa‐Marzal

Heuberger

2017

Journal of Colloid and Interface Science

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“…From the half-normal plot, it is observed that the temperature of the gas diffusion plate (T GDP ) is shown to have a very marginal effect on the etch rate. A relatively lower dissociation rate of F 2 is reported by Steudel et al (degree of dissociation, α ≈ 4%) at 1000 K [13], and (α < 1%) by Wicke et al at 600 K [14]. The above reported measurements are performed at the chamber pressure of around 1 bar.…”

Section: Analysis Of Etch Rate As the Dependent Variablementioning

confidence: 72%

On the Formation of Black Silicon Features by Plasma-Less Etching of Silicon in Molecular Fluorine Gas

et al. 2020

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In this paper, we study the plasma-less etching of crystalline silicon (c-Si) by F2/N2 gas mixture at moderately elevated temperatures. The etching is performed in an inline etching tool, which is specifically developed to lower costs for products needing a high volume manufacturing etching platform such as silicon photovoltaics. Specifically, the current study focuses on developing an effective front-side texturing process on Si(100) wafers. Statistical variation of the tool parameters is performed to achieve high etching rates and low surface reflection of the textured silicon surface. It is observed that the rate and anisotropy of the etching process are strongly defined by the interaction effects between process parameters such as substrate temperature, F2 concentration, and process duration. The etching forms features of sub-micron dimensions on c-Si surface. By maintaining the anisotropic nature of etching, weighted surface reflection (Rw) as low as Rw < 2% in Si(100) is achievable. The lowering of Rw is mainly due to the formation of deep, density grade nanostructures, so-called black silicon, with lateral dimensions that are smaller to the major wavelength ranges of interest in silicon photovoltaics.

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Die Kristallstrukturen der Alkaliperoxyde

Föppl

1957

Zeitschrift anorg allge chemie

161

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Die Darstellung und röntgenographische Untersuchung von Einkristallen der Peroxyde Na2O2, K2O2 und Rb2O2 wird beschrieben. Beim Cs2O2 konnte eine Strukturaufklärung mit Hilfe von Pulveraufnahmen durchgeführt werden. Folgende Gitterdimensionen [in Å] und Punktlagen(1) wurden gefunden: . Der O—O‐Abstand im Peroxydion wurde in den Alkaliperoxyden zu 1,50 ± 0,03 Å gefunden. Für Li2O2 konnte gezeigt werden, daß dieser Abstand im Gegensatz zu älteren Angaben mit den beobachteten Linienintensitäten verträglich ist, wenn man in der Raumgruppe C3h—C°6 die Li+ in den Punktlagen (a), (d) und (i) annimmt. (Abschn. V). Die bisher bekannten Strukturen anorganischer Peroxyde werden miteinander verglichen, wobei insbesondere auf das kristall‐ und raumchemische Verhalten der O 22−‐Gruppe eingegangen wird. (Abschn. VI).

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Physikalisch‐chemische Eigenschaften des Fluors

Abstract: Die Lithium-Verbindungen sind ungefahr ebenso reaktionsftihig wie die Magnesium-Verbindungen. Von besonderem lnteresse ist die Tatsache, daR sie bei der Uberfiihrung in Silicium-Verbindungen sehr vie1 bessere Ausbeuten liefern:

Cited by 12 publications

References 49 publications

Ion specific hydration in nano-confined electrical double layers

Ion specific hydration in nano-confined electrical double layers

On the Formation of Black Silicon Features by Plasma-Less Etching of Silicon in Molecular Fluorine Gas

Die Kristallstrukturen der Alkaliperoxyde

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