toggle visibility Search & Display Options

Select All    Deselect All
 |   | 
Details
   print
  Records Links
Author (up) Gravelle, S.; Dumais, J. doi  openurl
  Title A multi-scale model for fluid transport through a bio-inspired passive valve Type
  Year 2020 Publication Journal Of Chemical Physics Abbreviated Journal J. Chem. Phys.  
  Volume 152 Issue 1 Pages 10 pp  
  Keywords  
  Abstract Tillandsia landbeckii is a rootless plant thriving in the hyper-arid Atacama Desert of Chile. These plants use unique cellulose-based microscopic structures called trichomes to collect fresh water from coastal fog. The trichomes rely on a passive mechanism to maintain an asymmetrical transport of water: they allow for the fast absorption of liquid water deposited by sporadic fog events while preventing evaporation during extended drought periods. Inspired by the trichome's design, we study fluid transport through a micrometric valve. Combining Grand Canonical Monte Carlo with Non-Equilibrium Molecular Dynamics simulations, we first analyze the adsorption and transport of a fluid through a single nanopore at different chemical potentials. We then scale up the atomic results using a lattice approach, and simulate the transport at the micrometric scale. Results obtained for a model Lennard-Jones fluid and TIP4P/2005 water were compared, allowing us to identify the key physical parameters for achieving a passive hydraulic valve. Our results show that the difference in transport properties of water vapor and liquid water within the cellulose layer is the basis for the ability of the Tillandsia trichome to function as a water valve. Finally, we predict a critical pore dimension above which the cellulose layer can form an efficient valve.  
  Address [Gravelle, Simon; Dumais, Jacques] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Vina Del Mar, Chile, Email: simon.gravelle@live.fr  
  Corporate Author Thesis  
  Publisher Amer Inst Physics Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0021-9606 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000505578700020 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 1083  
Permanent link to this record
 

 
Author (up) Guerin, A.; Gravelle, S.; Dumais, J. pdf  doi
openurl 
  Title Forces behind plant cell division Type
  Year 2016 Publication Proceedings Of The National Academy Of Sciences Of The United States Of America Abbreviated Journal Proc. Natl. Acad. Sci. U. S. A.  
  Volume 113 Issue 32 Pages 8891-8893  
  Keywords  
  Abstract  
  Address [Guerin, Adrien; Gravelle, Simon; Dumais, Jacques] Univ Adolfo Ibanez, Fac Ingn Ciencias, Vina Del Mar 2562307, Chile, Email: jacques.dumais@uai.cl  
  Corporate Author Thesis  
  Publisher Natl Acad Sciences Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0027-8424 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000381293300032 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 664  
Permanent link to this record
 

 
Author (up) Kamal, C.; Gravelle, S.; Botto, L. doi  openurl
  Title Hydrodynamic slip can align thin nanoplatelets in shear flow Type
  Year 2020 Publication Nature Communications Abbreviated Journal Nat. Commun.  
  Volume 11 Issue 1 Pages 10 pp  
  Keywords  
  Abstract The large-scale processing of nanomaterials such as graphene and MoS2 relies on understanding the flow behaviour of nanometrically-thin platelets suspended in liquids. Here we show, by combining non-equilibrium molecular dynamics and continuum simulations, that rigid nanoplatelets can attain a stable orientation for sufficiently strong flows. Such a stable orientation is in contradiction with the rotational motion predicted by classical colloidal hydrodynamics. This surprising effect is due to hydrodynamic slip at the liquid-solid interface and occurs when the slip length is larger than the platelet thickness; a slip length of a few nanometers may be sufficient to observe alignment. The predictions we developed by examining pure and surface-modified graphene is applicable to different solvent/2D material combinations. The emergence of a fixed orientation in a direction nearly parallel to the flow implies a slip-dependent change in several macroscopic transport properties, with potential impact on applications ranging from functional inks to nanocomposites. Current theories predict that a plate-like particle rotates continuously in a shear flow. Kamal et al. instead show that even nanometric hydrodynamic slip may induce a thin plate-like particle to adopt a stable orientation, and discuss implications of this effect for flow processing of 2D nanomaterials.  
  Address [Kamal, Catherine; Gravelle, Simon; Botto, Lorenzo] Queen Mary Univ London, Sch Engn & Mat Sci, London, England, Email: l.botto@tudelft.nl  
  Corporate Author Thesis  
  Publisher Nature Publishing Group Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2041-1723 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000536569900023 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 1195  
Permanent link to this record
 

 
Author (up) Raux, P.S.; Gravelle, S.; Dumais, J. doi  openurl
  Title Design of a unidirectional water valve in Tillandsia Type
  Year 2020 Publication Nature Communications Abbreviated Journal Nat. Commun.  
  Volume 11 Issue 1 Pages 7 pp  
  Keywords  
  Abstract The bromeliad Tillandsia landbeckii thrives in the Atacama desert of Chile using the fog captured by specialized leaf trichomes to satisfy its water needs. However, it is still unclear how the trichome of T. landbeckii and other Tillandsia species is able to absorb fine water droplets during intermittent fog events while also preventing evaporation when the plant is exposed to the desert's hyperarid conditions. Here, we explain how a 5800-fold asymmetry in water conductance arises from a clever juxtaposition of a thick hygroscopic wall and a semipermeable membrane. While absorption is achieved by osmosis of liquid water, evaporation under dry external conditions shifts the liquid-gas interface forcing water to diffuse through the thick trichome wall in the vapor phase. We confirm this mechanism by fabricating artificial composite membranes mimicking the trichome structure. The reliance on intrinsic material properties instead of moving parts makes the trichome a promising basis for the development of microfluidics valves.  
  Address [Raux, Pascal S.; Gravelle, Simon; Dumais, Jacques] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Vina Del Mar, Chile, Email: jacques.dumais@uai.cl  
  Corporate Author Thesis  
  Publisher Nature Publishing Group Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2041-1723 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000512537400017 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 1101  
Permanent link to this record
Select All    Deselect All
 |   | 
Details
   print

Save Citations:
Export Records: