Electroosmosis through α-Hemolysin That Depends on Alkali Cation Type

Forsterite single phase powder Mg2SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680–740 °C and at 630–700 °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.

Download Full-text

Chemoselectivity in Cyclosiloxanolate Cluster Formation: An Alkali Cation Effect?

European Journal of Inorganic Chemistry ◽

10.1002/(sici)1099-0682(200006)2000:6<1327::aid-ejic1327>3.3.co;2-m ◽

2000 ◽

Vol 2000 (6) ◽

pp. 1327-1331 ◽

Cited By ~ 8

Author(s):

Claudia Zucchi ◽

Manuela Mattioli ◽

Giovanna Gavioli ◽

Massimo Moret ◽

Angelo Sironi ◽

...

Keyword(s):

Cluster Formation ◽

Alkali Cation ◽

Cation Effect

Download Full-text

Unraveling the compositional heterogeneity and carrier dynamics of alkali cation doped 3D/2D perovskites with improved stability

Materials Advances ◽

10.1039/d0ma00967a ◽

2021 ◽

Author(s):

Ming-Chun Tang ◽

Siyuan Zhang ◽

Timothy J. Magnanelli ◽

Nhan V. Nguyen ◽

Edwin J. Heilweil ◽

...

Keyword(s):

Relative Humidity ◽

Comprehensive Analysis ◽

Carrier Dynamics ◽

Alkali Cation ◽

Compositional Heterogeneity ◽

Improved Stability

A comprehensive analysis of the compositional heterogeneity and carrier dynamics in novel rubidium-doped 3D/2D perovskites is investigated, showing a PCE over 20% and improved stability at ≈50% relative humidity without encapsulation.

Download Full-text

Conformation of Polyethylene Glycol inside Confined Space: Simulation and Experimental Approaches

Nanomaterials ◽

10.3390/nano11010244 ◽

2021 ◽

Vol 11 (1) ◽

pp. 244

Author(s):

Tianji Ma ◽

Nicolas Arroyo ◽

Jean Marc Janot ◽

Fabien Picaud ◽

Sebastien Balme

Keyword(s):

Polyethylene Glycol ◽

Ion Transport ◽

Chain Structure ◽

Confined Space ◽

Cation Type ◽

Experimental Approaches

The modification of the inner nanopore wall by polymers is currently used to change the specific properties of the nanosystem. Among them, the polyethylene glycol (PEG) is the most used to prevent the fouling and ensure the wettability. However, its properties depend mainly on the chain structure that is very difficult to estimate inside this confined space. Combining experimental and simulation approaches, we provide an insight to the consequence of the PEG presence inside the nanopore on the nanopore properties. We show, in particular, that the cation type in the electrolyte, together with the type of electrolyte (water or urea), is at the origin of the ion transport modification in the nanopore.

Download Full-text