Ion Size Approaching the Bjerrum Length in Solvents of Low Polarity by Dendritic Encapsulation

2013 ◽  
Vol 47 (1) ◽  
pp. 191-196 ◽  
Author(s):  
Ralf Moritz ◽  
George Zardalidis ◽  
Hans-Jürgen Butt ◽  
Manfred Wagner ◽  
Klaus Müllen ◽  
...  
Keyword(s):  
Bjerrum Length ◽  
Ion Size

scholarly journals Spatial segregation of mixed-sized counterions in dendritic polyelectrolytes

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
J. S. Kłos ◽  
J. Paturej
Keyword(s):  
Electrostatic Interactions ◽  
Spatial Separation ◽  
Excluded Volume ◽  
The Core ◽  
Bjerrum Length ◽  
Two Component ◽  
Conformational Properties ◽  
Dynamics Simulations ◽  
Two Parameters ◽  
Swelling Factor

AbstractLangevin dynamics simulations are utilized to study the structure of a dendritic polyelectrolyte embedded in two component mixtures comprised of conventional (small) and bulky counterions. We vary two parameters that trigger conformational properties of the dendrimer: the reduced Bjerrum length, $$\lambda _B^*$$ λ B ∗ , which controls the strength of electrostatic interactions and the number fraction of the bulky counterions, $$f_b$$ f b , which impacts on their steric repulsion. We find that the interplay between the electrostatic and the counterion excluded volume interactions affects the swelling behavior of the molecule. As compared to its neutral counterpart, for weak electrostatic couplings the charged dendrimer exists in swollen conformations whose size remains unaffected by $$f_b$$ f b . For intermediate couplings, the absorption of counterions into the pervaded volume of the dendrimer starts to influence its conformation. Here, the swelling factor exhibits a maximum which can be shifted by increasing $$f_b$$ f b . For strong electrostatic couplings the dendrimer deswells correspondingly to $$f_b$$ f b . In this regime a spatial separation of the counterions into core–shell microstructures is observed. The core of the dendrimer cage is preferentially occupied by the conventional ions, whereas its periphery contains the bulky counterions.

scholarly journals A comparison study of sodium ion- and potassium ion-modified graphitic carbon nitride for photocatalytic hydrogen evolution

RSC Advances ◽  
2021 ◽  
Vol 11 (26) ◽  
pp. 15701-15709
Author(s):  
Siyu Hu ◽  
Anchi Yu ◽  
Rong Lu
Keyword(s):  
Size Effect ◽  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Sodium Ion ◽  
Graphitic Carbon Nitride ◽  
Comparison Study ◽  
Photocatalytic Hydrogen Evolution ◽  
Optical And Electronic Properties ◽  
Ion Size

The ion size effect on graphitic carbon nitride is responsible for variations in its structure, optical and electronic properties, and hence the enhancement in photocatalytic hydrogen evolution.

Ion Size Dependences of the Salting-Out Effect: Reversed Order of Sodium and Lithium Ions

2021 ◽  
Author(s):  
Hiroyuki Katsuto ◽  
Ryuichi Okamoto ◽  
Tomonari Sumi ◽  
Kenichiro Koga
Keyword(s):  
Lithium Ions ◽  
Salting Out ◽  
Ion Size ◽  
Reversed Order

EFFECT OF MEAN ION SIZE AND SPATIAL SPIN DISORDERS FOR (La1-xYx)2/3Ca1/3MnO3 MANGANITES

2004 ◽  
Vol 18 (26) ◽  
pp. 3451-3464 ◽  
Author(s):  
JINCANG ZHANG ◽  
YUFENG ZHANG ◽  
SHIXUN CAO ◽  
CHAO JING
Keyword(s):  
Single Phase ◽  
Bond Angle ◽  
Gradual Increase ◽  
High Concentration ◽  
Magnetic Studies ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Average Ionic Radius ◽  
Lower Temperature ◽  
Ion Size

The structure and transport properties of perovskite ( La 1-x Y x)2/3 Ca 1/3 MnO 3 (0≤x≤0.3) systems are systematically investigated. It is found that all the specimens show a single-phase structure and reveal a direct relationship between the Curie temperature Tc and the average ionic radius <rA> of La site. With increasing Y 3+ doped content, the metal-insulator transition temperature T MI (M-I) shifts to lower temperature. While the relevant resistivity peak ρp is sharp increased, for the specimens with large doping content, x=0.3, it has enhanced eight orders of magnitudes larger than the non-doped samples (x=0.0). At high concentration area, that is to say, when x>0.1, magnetic studies show a gradual increase of antiferromagnetic interaction with an increase of x, ultimately leading to a spatial-spin disorders, that is, spin-glass-like state for x=0.2 and x=0.3 compounds at about 35 K. The results show that it has connected a reduction of Tc and an increase in magnetoresistance with a decrease in the microstructural Mn - O - Mn bond angle.

The formation of thymidine-based T-tetramers with remarkable structural and metal ion size effects

2011 ◽  
Vol 9 (4) ◽  
pp. 1030-1033 ◽  
Author(s):  
Qun Luo ◽  
Dayong Wu ◽  
Shixiong Liu ◽  
Daihua Tang ◽  
Yong Huang ◽  
...  
Keyword(s):  
Size Effects ◽  
Metal Ion ◽  
Ion Size

Ion-size effect on electrokinetic energy conversion in nanofluidic channels

2016 ◽  
Vol 13 (10) ◽  
pp. 1050-1058 ◽  
Author(s):  
Hung-Chun Yeh ◽  
Chih-Chang Chang ◽  
Ruey-Jen Yang
Keyword(s):  
Size Effect ◽  
Energy Conversion ◽  
Nanofluidic Channels ◽  
Ion Size

Rare-earth-ion-size control on magnetic irreversibility field in CuBa2RECu2O7−δ

2001 ◽  
Vol 357-360 ◽  
pp. 230-233 ◽  
Author(s):  
Yukiko Yasukawa ◽  
Takayuki Nakane ◽  
Maarit Karppinen ◽  
Hisao Yamauchi
Keyword(s):  
Rare Earth ◽  
Size Control ◽  
Irreversibility Field ◽  
Rare Earth Ion ◽  
Magnetic Irreversibility ◽  
Ion Size

Ion-size dependent electroosmosis of viscoelastic fluids in microfluidic channels with interfacial slip

2017 ◽  
Vol 29 (7) ◽  
pp. 072002 ◽  
Author(s):  
Siddhartha Mukherjee ◽  
Prakash Goswami ◽  
Jayabrata Dhar ◽  
Sunando Dasgupta ◽  
Suman Chakraborty
Keyword(s):  
Viscoelastic Fluids ◽  
Microfluidic Channels ◽  
Interfacial Slip ◽  
Size Dependent ◽  
Ion Size
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