Long-Range Surface Charge-Charge Interactions in Proteins

1993 ◽  
Vol 232 (2) ◽  
pp. 574-583 ◽  
Author(s):  
Reign Loewenthal ◽  
Javier Sancho ◽  
Tapani Reinikainen ◽  
Alan R. Fersht
Keyword(s):  
Surface Charge ◽  
Long Range ◽  
Charge Interactions

scholarly journals Surface Charge Interactions of the FMN Module Govern Catalysis by Nitric-oxide Synthase

2006 ◽  
Vol 281 (48) ◽  
pp. 36819-36827 ◽  
Author(s):  
Koustubh Panda ◽  
Mohammad Mahfuzul Haque ◽  
Elsa D. Garcin-Hosfield ◽  
Deborah Durra ◽  
Elizabeth D. Getzoff ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Nitric Oxide Synthase ◽  
Surface Charge ◽  
Oxide Synthase ◽  
Charge Interactions

scholarly journals Computational design of the Fyn SH3 domain with increased stability through optimization of surface charge-charge interactions

2007 ◽  
Vol 16 (12) ◽  
pp. 2694-2702 ◽  
Author(s):  
Katrina L. Schweiker ◽  
Arash Zarrine-Afsar ◽  
Alan R. Davidson ◽  
George I. Makhatadze
Keyword(s):  
Surface Charge ◽  
Computational Design ◽  
Sh3 Domain ◽  
Charge Interactions

scholarly journals Strong attractions and repulsions mediated by monovalent salts

2017 ◽  
Vol 114 (45) ◽  
pp. 11838-11843 ◽  
Author(s):  
Yaohua Li ◽  
Martin Girard ◽  
Meng Shen ◽  
Jaime Andres Millan ◽  
Monica Olvera de la Cruz
Keyword(s):  
Surface Charge ◽  
Long Range ◽  
Electrolyte Solutions ◽  
Coarse Grained ◽  
Attractive Potential ◽  
Salting Out ◽  
Charge Densities ◽  
Charged Nanoparticles ◽  
Monovalent Salt ◽  
High Concentrations

Controlling interactions between proteins and nanoparticles in electrolyte solutions is crucial for advancing biological sciences and biotechnology. The assembly of charged nanoparticles (NPs) and proteins in aqueous solutions can be directed by modifying the salt concentration. High concentrations of monovalent salt can induce the solubilization or crystallization of NPs and proteins. By using a multiscale coarse-grained molecular dynamics approach, we show that, due to ionic correlations in the electrolyte, NPs pairs at high monovalent salt concentrations interact via remarkably strong long-range attractions or repulsions, which can be split into three regimes depending on the surface charge densities of the NPs. NPs with zero-to-low surface charge densities interact via a long-range attraction that is stronger and has a similar range to the depletion attraction induced by polymers with radius of gyrations comparable to the NP diameter. On the other hand, moderately charged NPs with smooth surfaces as well as DNA-functionalized NPs with no possibility of hybridization between them interact via a strong repulsion of range and strength larger than the repulsion predicted by models that neglect ionic correlations, including the Derjaguin–Landau–Vervey–Overbeek (DLVO) model. Interactions between strongly charged NPs (>2 e/nm2), both types smooth and DNA-functionalized NPs, show an attractive potential well at intermediate-to-high salt concentrations, which demonstrates that electrolytes can induce aggregation of strongly charged NPs. Our work provides an improved understanding of the role of ionic correlations in NP assembly and design rules to utilize the salting-out process to crystallize NPs.

Modulation of Surface Charge Transfer through Competing Long-Range Repulsive versus Short-Range Attractive Interactions

2011 ◽  
Vol 115 (38) ◽  
pp. 18640-18648 ◽  
Author(s):  
J. Fraxedas ◽  
S. García-Gil ◽  
S. Monturet ◽  
N. Lorente ◽  
I. Fernández-Torrente ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Surface Charge ◽  
Long Range ◽  
Short Range

A Zeta Potentiometric Study on Effects of Ionic Composition and Rock-Saturation on Surface-Charge Interactions in Low-Salinity Water Flooding for Carbonate Formation

2021 ◽  
Author(s):  
Paras Himmat Gopani ◽  
Navpreet Singh ◽  
Hemanta Kumar Sarma ◽  
Digambar S. Negi ◽  
Padmaja S. Mattey
Keyword(s):  
Zeta Potential ◽  
Surface Charge ◽  
Carbonate Rocks ◽  
Carbonate Rock ◽  
Ionic Composition ◽  
Streaming Potential ◽  
Potentiometric Studies ◽  
Rock Samples ◽  
Streaming Current ◽  
Charge Interactions

Abstract As carbonate reservoirs are mostly oil-wet, the potential for the success of a waterflooding is lower. Therefore, a primary focus during waterflooding such reservoirs is on the ionic composition and salinity of injected brine which are able to impact the alteration of the rock wettability favorably by altering the surface charge towards a higher negative value or close to zero. The objective of this study is to employ zeta potentiometric studies comprising streaming potential and streaming current techniques to quantify the surface interactions and charges between the carbonate rock and fluid type as a function of the variations in its ionic state and rock saturation. Zeta potentiometric studies were conducted on carbonate rock samples to understand the behavior of different aqueous solutions by variation in the brine's salinity and ionic composition and the results were integrated with wettability studies. The concentrations of potential-determining ions (PDIs) such as SO42-, Mg2+ and Ca2+ in the injected brines are deemed responsible for altering the wettability state of the carbonate rocks. Several diluted brines (25%, 10% and 1% diluted seawater) and smart brines have been investigated. Smart brines were prepared by spiking the concentration of major PDIs. All zeta potential measurements were conducted using a specially designed zeta potentiometer sample-holding clamp capable of using the whole core plugs rather than pulverized rock samples. A major advantage of using the whole core sample is that the same core can be used in subsequent coreflooding tests, thus making zeta potentiometric results more relevant and representative for a particular rock-fluid system used in the study. The classical streaming potential and streaming current techniques were used for zeta potential measurement. The Fairbrother-Mastin approach was used where the streaming potential is measured against different pressure differentials. Measurements were also carried out for brines with rock samples of different states: oil-saturated, water-saturated and rock samples cleaned with organic solvents to determine any likely variations in surface charge interactions. The results of our experiments imply that the value of zeta potential either increases or becomes more negative with increasing percentage of dilution (25%, 10%, and 1%). This can be attributed to electrical double-layer expansion which is primarily caused by reduced ionic strength. Furthermore, with measurements done on smart brines, zeta potential value was also found to be increased when different diluted brines are spiked with ionic concentration of PDIs such as sulfate. This could have been caused by surface ion alteration mechanism where PDIs get adsorbed on rock surface causing possible detachment of oil droplets. Both the phenomena are known mechanisms for altering wettability towards more water wetness in carbonate rocks and are discussed in detail.

Forces between zinc sulphide surfaces; amplification of the hydrophobic attraction by surface charge

2019 ◽  
Vol 21 (36) ◽  
pp. 20055-20064 ◽  
Author(s):  
E-Jen Teh ◽  
Naoyuki Ishida ◽  
William M. Skinner ◽  
Drew Parsons ◽  
Vincent S. J. Craig
Keyword(s):  
Surface Charge ◽  
Long Range ◽  
Surface Force ◽  
Zinc Sulphide ◽  
Force Measurements ◽  
Hydrophobic Attraction

Surface force measurements reveal that a small increase in surface charge enhance the long range hydrophobic attraction.

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