Scaling behaviour for the water transport in nanoconfined geometries.

Scaling behaviour for the water transport in nanoconfined geometries.
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DOI:
10.1038/ncomms4565
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发表时间:
2014-04-03
影响因子:
16.6
通讯作者:
Decuzzi, Paolo
Decuzzi, Paolo
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chiavazzo, Eliodoro;Fasano, Matteo;Asinari, Pietro;Decuzzi, Paolo

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The transport of water in nanoconfined geometries is different from bulk phase and has tremendous implications in nanotechnology and biotechnology. Here molecular dynamics is used to compute the self-diffusion coefficient D of water within nanopores, around nanoparticles, carbon nanotubes and proteins. For almost 60 different cases, D is found to scale linearly with the sole parameter θ as D(θ)=DB[1+(DC/DB−1)θ], with DB and DC the bulk and totally confined diffusion of water, respectively. The parameter θ is primarily influenced by geometry and represents the ratio between the confined and total water volumes. The D(θ) relationship is interpreted within the thermodynamics of supercooled water. As an example, such relationship is shown to accurately predict the relaxometric response of contrast agents for magnetic resonance imaging. The D(θ) relationship can help in interpreting the transport of water molecules under nanoconfined conditions and tailoring nanostructures with precise modulation of water mobility. A precise control of water transport in different configurations is crucial for many technological applications. Chiavazzo et al. define a dimensionless scaling parameter to fully describe the water self-diffusion coefficient in various nanoconfined geometries using molecular dynamic simulations.
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