Wetting Transition of the Ethanol–Water Droplet on Smooth and Textured Surfaces

Metya, Atanu K.; Khan, Sandip; Singh, Jayant K.

doi:10.1021/jp4096437

Cited by 51 publications

(32 citation statements)

References 58 publications

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“…To ensure the entire coating of the fibers, the mats were immersed in absolute ethanol to increase wettability of the PLA fibers. 60,61 After this, NaOH aqueous solution wetted and etched the inner fibers. The rest of the treatments are performed in ethanol and the whole fibrous mat is perfectly wet.…”

Section: Surface Treatmentsmentioning

confidence: 99%

Towards 4th generation biomaterials: a covalent hybrid polymer–ormoglass architecture

et al. 2015

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Hybrid materials are being extensively investigated with the aim of mimicking the ECM microenvironment to develop effective solutions for bone tissue engineering. However, the common drawbacks of a hybrid material are the lack of interactions between the scaffold's constituents and the masking of its bioactive phase. Conventional hybrids often degrade in a non-homogeneous manner and the biological response is far from optimal. We have developed a novel material with strong interactions between constituents. The bioactive phase is directly exposed on its surface mimicking the structure of the ECM of bone. Here, polylactic acid electrospun fibers have been successfully and reproducibly coated with a bioactive organically modified glass (ormoglass, Si-Ca-P2 system) covalently. In comparison with the pure polymeric mats, the fibers obtained showed improved hydrophilicity and mechanical properties, bioactive ion release, exhibited a nanoroughness and enabled good cell adhesion and spreading after just one day of culture (rMSCs and rEPCs). The fibers were coated with different ormoglass compositions to tailor their surface properties (roughness, stiffness, and morphology) by modifying the experimental parameters. Knowing that cells modulate their behavior according to the exposed physical and chemical signals, the development of this instructive material is a valuable advance in the design of functional regenerative biomaterials.

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Section: Surface Treatmentsmentioning

confidence: 99%

Towards 4th generation biomaterials: a covalent hybrid polymer–ormoglass architecture

et al. 2015

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“…Additionally, most previous MD simulations adopted a single-scale structured surface, e.g., a rough surface with a single length scale of nanopillared or nanotrapezoidal textures. 33 − 36 These studies observed only two common wetting/dewetting states: the Wenzel state (in which water droplets are in full contact with the rough surface) and the Cassie–Baxter (or Cassie) state (in which water droplets are in contact only with the tops of the structured surface). For more realistic and common dual-scale (or multiscale) hierarchical surfaces, the presence of at least of two length scales (nano, micro, and larger etc.)…”

Section: Introductionmentioning

confidence: 99%

Multiple Wetting–Dewetting States of a Water Droplet on Dual-Scale Hierarchical Structured Surfaces

Gao

Liu

Jiang

et al. 2021

JACS Au

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Surfaces with microscale roughness can entail dual-scale hierarchical structures such as the recently reported nano/microstructured surfaces produced in the laboratory ( 32494077 Nature 2020 582 55 57 ). However, how the dual-scale hierarchical structured surface affects the apparent wetting/dewetting states of a water droplet, and the transitions between the states are still largely unexplored. Here, we report a systematic large-scale molecular dynamics (MD) simulation study on the wetting/dewetting states of water droplets on various dual-scale nano/near-submicrometer structured surfaces. To this end, we devise slab-water/slab-substrate model systems with a variety of dual-scale surface structures and with different degrees of intrinsic wettability (as measured based on the counterpart smooth surface). The dual-scale hierarchical structure can be described as “nanotexture-on-near-submicrometer-hill”. Depending on three prototypical nanotextures, our MD simulations reveal five possible wetting/dewetting states for a water droplet: (i) Cassie state; (ii) infiltrated upper-valley state; (iii) immersed nanotexture-on-hill state; (iv) infiltrated valley state; and (v) Wenzel state. The transitions between these wetting/dewetting states are strongly dependent on the intrinsic wettability ( E in ), the initial location of the water droplet, the height of the nanotextures ( H 1 ), and the spacing between nanotextures ( W 1 ). Notably, E in – H 1 and E in – W 1 diagrams show that regions of rich wetting/dewetting states can be identified, including regions where between one to five states can coexist.

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“…Although wetting of solid surfaces by a liquid mixture is encountered frequently in many industrial applications and biological systems, most of the actual studies concerning wetting focus on one−component liquids. There have been very few experimental studies regarding the wetting of a solid surface by liquid mixtures [16,23,30,31,34] and also only very few theoretical investigations [32,33,[35][36][37][38][39] thereof. A microscopic understanding of the Cassie − Wenzel transition for liquid mixtures is crucial for many application purposes.…”

Section: Introductionmentioning

confidence: 99%

Cassie-Wenzel transition of a binary liquid mixture on a nano-sculptured surface

Singh,

Schimmele,

Dietrich

2019

Preprint

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The Cassie -Wenzel transition of a symmetric binary liquid mixture in contact with a nanocorrugated wall is studied. The corrugation consists of a periodic array of nano-pits with square cross sections. The substrate potential is the sum over Lennard-Jones interactions, describing the pairwise interaction between the wall particles C and the fluid particles. The liquid is composed of two species of particles, A and B, which have the same size and equal A − A and B − B interactions. The liquid particles interact between each other also via A − B Lennard-Jones potentials. We have employed classical density functional theory to determine the equilibrium structure of binary liquid mixtures in contact with the nano-corrugated surface. Liquid intrusion into the pits is studied as a function of various system parameters such as the composition of the liquid, the strengths of various inter-particle interactions, as well as the geometric parameters of the pits. The binary liquid mixture is taken to be at its mixed-liquid-vapor coexistence. For various sets of parameters the results obtained for the Cassie -Wenzel transition, as well as for the metastability of the two corresponding thermodynamic states, are compared with macroscopic predictions in order to check the range of validity of the macroscopic theories for systems exposed to nanoscopic confinements. Distinct from the macroscopic theory, it is found that the Cassie -Wenzel transition cannot be predicted based on the knowledge of a single parameter, such as the contact angle within the macroscopic theory.

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Wetting Transition of the Ethanol–Water Droplet on Smooth and Textured Surfaces

Cited by 51 publications

References 58 publications

Towards 4th generation biomaterials: a covalent hybrid polymer–ormoglass architecture

Towards 4th generation biomaterials: a covalent hybrid polymer–ormoglass architecture

Multiple Wetting–Dewetting States of a Water Droplet on Dual-Scale Hierarchical Structured Surfaces

Cassie-Wenzel transition of a binary liquid mixture on a nano-sculptured surface

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