Nanoscopic Interfacial Water Layers on NanocrystallineDiamond

2014 ◽  
pp. 105-123
Author(s):  
Andrei Sommer ◽  
Hans-Jörg Fecht
Keyword(s):  
Interfacial Water ◽  
Water Layers

Biomimetics: Learning from diamonds

2008 ◽  
Vol 23 (12) ◽  
pp. 3148-3152 ◽  
Author(s):  
Andrei P. Sommer ◽  
Dan Zhu ◽  
Ralf-Peter Franke ◽  
Hans-Joerg Fecht
Keyword(s):  
Biomedical Engineering ◽  
Experimental Methods ◽  
Observational Evidence ◽  
Nanocrystalline Diamond ◽  
Interfacial Water ◽  
Water Layers ◽  
Cellular Recognition ◽  
First Contact

There is increasing observational evidence for an implication of the order of interfacial water layers in biology, for instance in processes of cellular recognition and during first contact events, where cells decide to survive or enter apoptosis. Experimental methods that allow access to the order of interfacial water layers are thus crucial in biomedical engineering. In this study, we show that interfacial water structures can be nondestructively analyzed on the nanocrystalline diamond. Results open the gate to a new chapter in the design of biomaterials inspired by biomimetic principles.

Sliding plastics on ice: fluorescence spectroscopic studies on interfacial water layers in the μm thickness regime

1998 ◽  
Vol 66 (5) ◽  
pp. 599-602 ◽  
Author(s):  
H. Strausky ◽  
J.R. Krenn ◽  
A. Leitner ◽  
F.R. Aussenegg
Keyword(s):  
Spectroscopic Studies ◽  
Interfacial Water ◽  
Water Layers

scholarly journals Interfacial Layers and the Shear Elasticity of the Collagen–Water System

2019 ◽  
Vol 64 (1) ◽  
pp. 34 ◽  
Author(s):  
L. A. Bulavin ◽  
Yu. F. Zabashta ◽  
L. Yu. Vergun ◽  
O. S. Svechnikova ◽  
A. S. Yefimenko
Keyword(s):  
Experimental Data ◽  
Water System ◽  
Water Layer ◽  
Interfacial Water ◽  
Loose Connective Tissue ◽  
Supporting Function ◽  
Interfacial Layers ◽  
Water Layers ◽  
Collagen Hydrogels ◽  
Shear Elasticity

A hypothesis has been put forward that, in collagen hydrogels, there exist interfacial water layers surrounding the collagen helices. A model of interfacial water layer is proposed which does not contradict experimental data on the shear elasticity of collagen hydrogels. Such layers can exist in a loose connective tissue and prove its supporting function.

scholarly journals Double-Chain Cationic Surfactants: Swelling, Structure, Phase Transitions and Additive Effects

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 3946
Author(s):  
Rui A. Gonçalves ◽  
Yeng-Ming Lam ◽  
Björn Lindman
Keyword(s):  
Phase Transitions ◽  
Phase Behaviour ◽  
Double Chain ◽  
Scanning Calorimetry ◽  
Alkyl Chains ◽  
X Ray Scattering ◽  
Amphiphilic Compounds ◽  
Liquid Phases ◽  
Lamellar Phases ◽  
Water Layers

Double-chain amphiphilic compounds, including surfactants and lipids, have broad significance in applications like personal care and biology. A study on the phase structures and their transitions focusing on dioctadecyldimethylammonium chloride (DODAC), used inter alia in hair conditioners, is presented. The phase behaviour is dominated by two bilayer lamellar phases, Lβ and Lα, with “solid” and “melted” alkyl chains, respectively. In particular, the study is focused on the effect of additives of different polarity on the phase transitions and structures. The main techniques used for investigation were differential scanning calorimetry (DSC) and small- and wide-angle X-ray scattering (SAXS and WAXS). From the WAXS reflections, the distance between the alkyl chains in the bilayers was obtained, and from SAXS, the thicknesses of the surfactant and water layers. The Lα phase was found to have a bilayer structure, generally found for most surfactants; a Lβ phase made up of bilayers with considerable chain tilting and interdigitation was also identified. Depending mainly on the polarity of the additives, their effects on the phase stabilities and structure vary. Compounds like urea have no significant effect, while fatty acids and fatty alcohols have significant effects, but which are quite different depending on the nonpolar part. In most cases, Lβ and Lα phases exist over wide composition ranges; certain additives induce transitions to other phases, which include cubic, reversed hexagonal liquid crystals and bicontinuous liquid phases. For a system containing additives, which induce a significant lowering of the Lβ–Lα transition, we identified the possibility of a triggered phase transition via dilution with water.

scholarly journals Origin and control of ionic hydration patterns in nanopores

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Miraslau L. Barabash ◽  
William A. T. Gibby ◽  
Carlo Guardiani ◽  
Alex Smolyanitsky ◽  
Dmitry G. Luchinsky ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Distribution Functions ◽  
Water Molecules ◽  
Surrounding Water ◽  
Ionic Hydration ◽  
Hydration Shells ◽  
Water Layers ◽  
Dynamics Simulations ◽  
And Control

AbstractIn order to permeate a nanopore, an ion must overcome a dehydration energy barrier caused by the redistribution of surrounding water molecules. The redistribution is inhomogeneous, anisotropic and strongly position-dependent, resulting in complex patterns that are routinely observed in molecular dynamics simulations. Here, we study the physical origin of these patterns and of how they can be predicted and controlled. We introduce an analytic model able to predict the patterns in a graphene nanopore in terms of experimentally accessible radial distribution functions, giving results that agree well with molecular dynamics simulations. The patterns are attributable to a complex interplay of ionic hydration shells with water layers adjacent to the graphene membrane and with the hydration cloud of the nanopore rim atoms, and we discuss ways of controlling them. Our findings pave the way to designing required transport properties into nanoionic devices by optimising the structure of the hydration patterns.

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