LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 5 of total 5

Search options

  1. Article ; Online: Pattern Formation in Evaporative Drying of a Polymer Solution Droplet over a Soft Swellable Substrate.

    Sahoo, Sumita / Mukherjee, Rabibrata

    Langmuir : the ACS journal of surfaces and colloids

    2023  Volume 39, Issue 27, Page(s) 9526–9537

    Abstract: We report morphological evolution and pattern formation during evaporative drying of a droplet of polymethylmethacrylate (PMMA) dissolved in tetrahydrofuran over a soft, swellable cross-linked Sylgard 184 substrate. In contrast to the well-known coffee ... ...

    Abstract We report morphological evolution and pattern formation during evaporative drying of a droplet of polymethylmethacrylate (PMMA) dissolved in tetrahydrofuran over a soft, swellable cross-linked Sylgard 184 substrate. In contrast to the well-known coffee ring formation due to the evaporation of a polymer solution droplet over a rigid substrate, we show that the situation becomes far more complicated over a Sylgard 184 substrate due to solvent penetration and associated swelling. The combined effect of evaporation and diffusive penetration leads to significantly faster solvent loss and results in the formation of an in situ thin polymer shell over the free surface of the evaporating droplet due to the attainment of local glass-transition concentration. The diffusive penetration of the solvent also leads to the spreading of the three-phase contact line (TPCL) of the droplet after dispensing. The vertical component of surface tension acting at the TPCL results in the formation of peripheral creases along the boundary of the droplet after the TPCL pins. With the progressive solvent loss, the shell eventually collapses, resulting in a buckled morphology with a central depression. We show that the evolution pathway and the final deposit morphology depend strongly on the initial PMMA concentration (
    Language English
    Publishing date 2023-06-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2005937-1
    ISSN 1520-5827 ; 0743-7463
    ISSN (online) 1520-5827
    ISSN 0743-7463
    DOI 10.1021/acs.langmuir.3c01069
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  2. Book ; Online: Evaporation of Colloidal Suspension Droplets over Oil-infused Slippery Surfaces

    Sahoo, Sumita / Mukherjee, Rabibrata

    2023  

    Abstract: Evaporative drying of colloidal droplets with different concentrations (Ci) on liquid infused slippery substrate (LISS) surfaces fabricated over biomimetically patterned sticky hydrophobic surfaces is reported here. These slippery surfaces remain stable ... ...

    Abstract Evaporative drying of colloidal droplets with different concentrations (Ci) on liquid infused slippery substrate (LISS) surfaces fabricated over biomimetically patterned sticky hydrophobic surfaces is reported here. These slippery surfaces remain stable under the aqueous droplets. The effective thickness of the infused oil layer (hE) was varied and its effect on the evaporation dynamics, wetting ridge formation and the final deposition pattern were studied using an optical microscope as well as a contact angle goniometer. The results were contrasted to those obtained over bare (oil-free) flat and patterned sticky surfaces. Unlike strong pinning and consequent peripheral ring deposit invariably observed in evaporation of a colloidal droplet over a solid surface (i.e. bare flat Sylgard 184 without oil), over a LISS, the dynamics, including the extent of pinning and the final deposit morphology, were found to be strongly dependant on hE. Due to the presence of the underlying patterns, the extent of pinning increased with a reduction in hE. Prolonged evaporation over a LISS leads to a uniform deposition due to gravity-induced settling of the colloids followed by capillarity-mediated rearrangement of the particles. Colloidal assembly at the droplet free surface and the droplet-wetting ridge interface leads to a thinner encapsulating oil layer and faster drainage of the wetting ridge resulting in a higher evaporation rate before pinning of the suspension droplets over all LISS surfaces.
    Keywords Condensed Matter - Soft Condensed Matter
    Subject code 660
    Publishing date 2023-11-24
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

    More links

    Kategorien

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article: Commercial Initiation of Feather Hydrolysate as Supreme Fertilizer: A Smart Bio-Cleaning Strategy of Poultry Waste.

    Sahoo, Sumita / Dash, Satyabrata / Rath, Biswajit / Mondal, Keshab C / Mandal, Arpita

    Waste and biomass valorization

    2022  Volume 14, Issue 7, Page(s) 2151–2166

    Language English
    Publishing date 2022-12-16
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 2541900-6
    ISSN 1877-265X ; 1877-2641
    ISSN (online) 1877-265X
    ISSN 1877-2641
    DOI 10.1007/s12649-022-01982-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article ; Online: Reversible morphological switching and deformation hysteresis in electric field mediated instability of thin elastic films.

    Sahoo, Sumita / Bhandaru, Nandini / Mukherjee, Rabibrata

    Soft matter

    2019  Volume 15, Issue 18, Page(s) 3828–3834

    Abstract: Reversible morphology switching in a soft elastic film sandwiched between two parallel electrodes when subject to an externally applied electric field is reported herein. In contrast to electric field mediated instability of a thin liquid film, where the ...

    Abstract Reversible morphology switching in a soft elastic film sandwiched between two parallel electrodes when subject to an externally applied electric field is reported herein. In contrast to electric field mediated instability of a thin liquid film, where the instability patterns remain permanent, in the present case the patterns debond completely or partially when the electric field is switched off, depending on whether the gap spacing (dG) between the film and the top electrode is >100 nm or not. The onset of instability is marked with the appearance of isotropic columns when the applied field strength (U) exceeds a critical value (Uc). The subsequent increase in U leads to the gradual transition of the instability patterns from pillars to bi-continuous labyrinths to an array of holes. Complete conformal contact is established between the film and the top electrode at U = UF. When U is reduced, the morphology changes in a reverse sequence. There is a significant level of hysteresis between the bonding and debonding stages, including persistence of the features at much lower voltages due to pinning of the patterns to the top electrode. Complete detachment occurs at a lower voltage UD when dG > 100 nm. The holes fluctuate before complete contact between the film and the top electrode due to competition between the destabilizing electric field and restoring forces due to stretching of the crosslinked polymer matrix.
    Language English
    Publishing date 2019-04-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 2191476-X
    ISSN 1744-6848 ; 1744-683X
    ISSN (online) 1744-6848
    ISSN 1744-683X
    DOI 10.1039/c8sm02622j
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  5. Article ; Online: Evaporation-induced alterations in oscillation and flow characteristics of a sessile droplet on a rose-mimetic surface.

    Kabi, Prasenjit / Razdan, Vishank / Roy, Durbar / Bansal, Lalit / Sahoo, Sumita / Mukherjee, Rabibrata / Chaudhuri, Swetaprovo / Basu, Saptarshi

    Soft matter

    2021  Volume 17, Issue 6, Page(s) 1487–1496

    Abstract: Strategic control of evaporation dynamics can help control oscillation modes and internal flow field in an oscillating sessile droplet. This article presents the study of an oscillating droplet on a bio-inspired "sticky" surface to better understand the ... ...

    Abstract Strategic control of evaporation dynamics can help control oscillation modes and internal flow field in an oscillating sessile droplet. This article presents the study of an oscillating droplet on a bio-inspired "sticky" surface to better understand the nexus between the modes of evaporation and oscillation. Oscillation in droplets can be characterized by the number of nodes forming on the surface and is referred to as the mode of oscillation. An evaporating sessile droplet under constant periodic perturbation naturally self-tunes between different oscillation modes depending on its geometry. The droplet geometry evolves according to the mode of evaporation controlled by substrate topography. We use a bio-inspired, rose patterned, "sticky" hydrophobic substrate to perpetually pin the contact line of the droplet in order to hence achieve a single mode of evaporation for most of the droplet's lifetime. This allows the prediction of experimentally observed oscillation mode transitions at different excitation frequencies. We present simple scaling arguments to predict the velocity of the internal flow induced by the oscillation. The findings are beneficial to applications which seek to tailor energy and mass transfer rates across liquid droplets by using bio-inspired surfaces.
    Language English
    Publishing date 2021-01-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 2191476-X
    ISSN 1744-6848 ; 1744-683X
    ISSN (online) 1744-6848
    ISSN 1744-683X
    DOI 10.1039/d0sm02106g
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

To top