Role of spatial valence charge density on the metastability of an immiscible binary metal system at equilibrium

2005 ◽  
Vol 72 (2) ◽  
Author(s):  
Y. Kong ◽  
J. H. Li ◽  
L. T. Kong ◽  
B. X. Liu
Keyword(s):  
Charge Density ◽  
Metal System ◽  
Binary Metal ◽  
Binary Metal System

Preparation of a composite catalyst for the decomposition of N2O gas using ultrafine particle beams: Silver-cobalt monoxide binary metal system

1998 ◽  
Vol 173 (1) ◽  
pp. 37-45 ◽  
Author(s):  
Hirokazu Ichitsubo ◽  
Yukihiko Horiuchi ◽  
Kunio Uchida ◽  
Ellen Sekreta ◽  
Akihiro Gotoh ◽  
...  
Keyword(s):  
Ultrafine Particle ◽  
Composite Catalyst ◽  
Metal System ◽  
Particle Beams ◽  
Binary Metal ◽  
Binary Metal System

Adsorption of copper and lead in single and binary metal system onto Fumaria indica biomass

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Metal Ion ◽  
Metal Removal ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Metal System ◽  
Lead Adsorption ◽  
Binary Metal ◽  
Binary Metal System ◽  
Adsorption Data

Among heavy metals, lead and copper pose a significant threat to the due to their toxicity, incremental accumulation in the food chain and persistence in the ecosystem. Lead and copper are introduced into water from various industries and other human activities. Present study was aimed to remove lead and copper from aqueous media using Fumaria indica biomass as a function of metal ions initial concentration. Both metal removal was investigated in single and binary system. For comparison isotherm models i.e., Langmuir and Freundlich were applied on experimental adsorption data. Results showed that the copper behavior was different in single and binary metal system, whereas lead adsorption remained the same in both single and binary metal systems. The Freundlich isotherm model fitted well to the adsorption data of both single and binary metal system. The thermodynamic parameters i.e., ΔG0, was measured to get insight into adsorption phenomenon and negative value of ΔG0 suggest that the adsorption process was spontaneous in nature. Results showed that in multi-metal system the adsorption of specific metal ion may change and during metal adsorption from industrial wastewater this effect must be taken in account before generalization of results.

Sodium hyroxyethylcellulose succinate: An efficient ion exchanger to remove Cd(II) from single and binary metal system

2017 ◽  
Vol 64 ◽  
pp. 189-197
Author(s):  
Muhammad Ajaz Hussain ◽  
Muhammad Ali Ali ◽  
Muhammad Imran Irfan ◽  
Rizwan Nasir Paracha
Keyword(s):  
Ion Exchanger ◽  
Metal System ◽  
Binary Metal ◽  
Binary Metal System

scholarly journals Deciphering the Role of π-Interactions in Polyelectrolyte Complexes Using Rationally Designed Peptides

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2074
Author(s):  
Sara Tabandeh ◽  
Cristina Elisabeth Lemus ◽  
Lorraine Leon
Keyword(s):  
Hydrogen Bonding ◽  
Phase Separation ◽  
Liquid Phase ◽  
Charge Density ◽  
Secondary Structures ◽  
Liquid Phase Separation ◽  
Polyelectrolyte Complexes ◽  
Π Interactions ◽  
Liquid Liquid Phase Separation

Electrostatic interactions, and specifically π-interactions play a significant role in the liquid-liquid phase separation of proteins and formation of membraneless organelles/or biological condensates. Sequence patterning of peptides allows creating protein-like structures and controlling the chemistry and interactions of the mimetic molecules. A library of oppositely charged polypeptides was designed and synthesized to investigate the role of π-interactions on phase separation and secondary structures of polyelectrolyte complexes. Phenylalanine was chosen as the π-containing residue and was used together with lysine or glutamic acid in the design of positively or negatively charged sequences. The effect of charge density and also the substitution of fluorine on the phenylalanine ring, known to disrupt π-interactions, were investigated. Characterization analysis using MALDI-TOF mass spectroscopy, H NMR, and circular dichroism (CD) confirmed the molecular structure and chiral pattern of peptide sequences. Despite an alternating sequence of chirality previously shown to promote liquid-liquid phase separation, complexes appeared as solid precipitates, suggesting strong interactions between the sequence pairs. The secondary structures of sequence pairs showed the formation of hydrogen-bonded structures with a β-sheet signal in FTIR spectroscopy. The presence of fluorine decreased hydrogen bonding due to its inhibitory effect on π-interactions. π-interactions resulted in enhanced stability of complexes against salt, and higher critical salt concentrations for complexes with more π-containing amino acids. Furthermore, UV-vis spectroscopy showed that sequences containing π-interactions and increased charge density encapsulated a small charged molecule with π-bonds with high efficiency. These findings highlight the interplay between ionic, hydrophobic, hydrogen bonding, and π-interactions in polyelectrolyte complex formation and enhance our understanding of phase separation phenomena in protein-like structures.

Beyond Charge Density Matching: The Role of C–H···O Interactions in the Formation of Templated Vanadium Tellurites

2011 ◽  
Vol 11 (9) ◽  
pp. 4213-4219 ◽  
Author(s):  
Matthew D. Smith ◽  
Samuel M. Blau ◽  
Kelvin B. Chang ◽  
Matthias Zeller ◽  
Joshua Schrier ◽  
...  
Keyword(s):  
Charge Density
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