X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Laradji, Mohamed  (4)
Type of Medium
Publisher
Person/Organisation
Language
Years
  • 1
    Online Resource
    Online Resource
    Prospects of nanorods as an emulsifying agent of immiscible blends
    AIP Publishing ; 2008
    In:  The Journal of Chemical Physics Vol. 128, No. 5 ( 2008-02-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 128, No. 5 ( 2008-02-07)
    Abstract: Immiscible binary fluids containing rigid nanorods that are preferentially immersed in one of the two fluids are systematically investigated via dissipative particle dynamics simulations. For sufficiently high volume fraction and/or aspect ratio, nanorods lead to a pronounced slowing down of the phase separation process, and yield microphase-separated structures with a characteristic length scale that decreases as either the nanorods length or their volume fraction is increased. The slowing down of the dynamics is attributed to a disordered jamming of the nanorods in the preferred component and a dramatic reduction in their diffusion due to kinetic conformational hindrance. The final characteristic length scale of the dispersion, reduced by the nanorods length, is found to depend only on Onsager’s dimensionless parameter ψν, where ψ and ν are the nanorods volume fraction and aspect ratio, respectively. These results indicate that nanorods may be used as an effective emulsifying agent of binary polymer blends.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.2826322
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 2
    Online Resource
    Online Resource
    Microphase separation induced by interfacial segregation of isotropic, spherical nanoparticles
    AIP Publishing ; 2007
    In:  The Journal of Chemical Physics Vol. 126, No. 24 ( 2007-06-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 126, No. 24 ( 2007-06-28)
    Abstract: In a recent experiment by Chung et al. [Nano Lett. 5, 1878 (2005)] and simulation by Stratford et al. [Science 309, 2198 (2005)] on immiscible blends containing nanoscale particles, it was shown that the phase separation of the two polymers can be prevented as a result of the aggregation of the nanoparticles at the interfaces between the two polymers. Motivated by these studies, we performed large scale systematic simulations, based on the dissipative particle dynamics approach, on immiscible binary (A-B) fluids containing moderate volume fractions of isotropic nanoscale spherical particles N. The nanoparticles preferentially segregate at the interfaces between the two fluids if the pairwise interactions between the three components are such that χAB & gt;∣χAN−χBN∣. We find that at later times, the average domain size saturates to a value, L∼RN∕ϕN, where RN and ϕN are the radius and volume fraction of the nanoparticles, respectively. For small nanoparticles, however, full phase separation is observed.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.2746862
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 3
    Online Resource
    Online Resource
    Dissipative particle dynamics simulation of the interplay between spinodal decomposition and wetting in thin film binary fluids
    AIP Publishing ; 2010
    In:  The Journal of Chemical Physics Vol. 132, No. 2 ( 2010-01-14)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 132, No. 2 ( 2010-01-14)
    Abstract: The dynamics of phase separation of thin film binary fluids is investigated via dissipative particle dynamics simulation. We consider both cases of symmetric and asymmetric interactions between the walls and the two components. In the case of walls interacting symmetrically with the two fluid components, corresponding to a nonwetting case, relatively fast kinetics is observed when the average domain size is smaller than the slit thickness. A crossover to a slow Lifshitz–Slyozov growth is observed at late times. Faster dynamics is observed when the walls act as a slip boundary condition to the velocity field. In the case of asymmetric interactions, such that the system is in the wetting regime, the interplay between wetting kinetics and spinodal decomposition leads to rich dynamics. The phase separation proceeds through three stages. During the first stage, the dynamics is characterized as surface-directed spinodal decomposition, with growth of both average domain size and thickness of the wetting layers. The domain morphology is three dimensional and bicontinuous during the first stage, with kinetics reminiscent of that in bulk systems is observed. The second stage of the phase separation is characterized by the breakup of the bicontinuous domain morphology into small tubular domains bridging the two wetting layers and depletion of the core of the film from the wetting component. During this stage, domains with diameter smaller than thickness of the film shrink and disappear while those with diameter larger that the film thickness grow. The third stage is characterized by growth induced by the backflow of A-component from the wetting layers to the core of the film, leading to the decay in the thickness of the film and growth of the domains bridging the wetting layers. At even later times of the third stage, when the wetting layers become very depleted in the wetting component, growth becomes mediated by diffusion followed by collision of the tubular domains.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3281689
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
  • 4
    Online Resource
    Online Resource
    Nanospheres in phase-separating multicomponent fluids: A three-dimensional dissipative particle dynamics simulation
    AIP Publishing ; 2004
    In:  The Journal of Chemical Physics Vol. 121, No. 21 ( 2004-12-01), p. 10641-10647
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 121, No. 21 ( 2004-12-01), p. 10641-10647
    Abstract: The dynamics of phase separation of three-dimensional fluids containing nanospheres, which interact preferentially with one of the two fluids, is studied by means of large-scale dissipative particle dynamics simulations. We systematically investigated the effect of volume fraction, radius, and mass of the nanoparticles on both kinetics and morphology of the binary mixture. We found that nanospheres lead to a reduction of domain growth which is intensified as their volume fraction is increased for a given radius of nanoparticles, or as the nanoparticles radius is decreased for a given volume fraction. Up to moderate volume fractions of nanoparticles, the growth law, however, is found to be identical to that pure binary fluids, i.e., R(t)∼tn, with n=1. For relatively high volume fractions of nanoparticles, a diffusive growth regime was detected. The crossover to the slower growth regime as the nanoparticles volume fraction is increased or their radius is decreased is associated with the crystallization of the nanospheres within the preferred component. These results are qualitatively in good agreement with previous two-dimensional simulations using molecular dynamics [M. Laradji and G. MacNevin, J. Chem. Phys. 119, 2275 (2003)] and a time-dependent Ginzburg-Landau model [M. Laradji, J. Chem. Phys. 120, 9330 (2004)] , as well as recent experiments.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1806815
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Online Resource
    Open Access Request
    Availability (electronic / print)
Nothing or not found what you are looking for? Please check your search query or use the Interlibrary Loan Search.
Close ⊗
This website uses cookies and the analysis tool Matomo. Further information can be found on the KOBV privacy pages