A5070360554- Surface Modification and Superhydrophobicity
- Fluid Dynamics and Turbulent Flows
- Bacterial biofilms and quorum sensing
- Adhesion, Friction, and Surface Interactions
- Advanced Sensor and Energy Harvesting Materials
- Particle Dynamics in Fluid Flows
- Wind and Air Flow Studies
- Fluid Dynamics and Heat Transfer
- Bacterial Genetics and Biotechnology
- Aerodynamics and Fluid Dynamics Research
- Silicone and Siloxane Chemistry
- Polymer Surface Interaction Studies
- Advanced Polymer Synthesis and Characterization
- Electrospun Nanofibers in Biomedical Applications
- Fluid Dynamics and Vibration Analysis
- Heat Transfer Mechanisms
- Advanced Materials and Mechanics
- Microbial Community Ecology and Physiology
- Bacteriophages and microbial interactions
- Nanomaterials and Printing Technologies
- Aeolian processes and effects
- Nanoparticle-Based Drug Delivery
- Micro and Nano Robotics
- Ionosphere and magnetosphere dynamics
- Evolutionary Game Theory and Cooperation
Harvard University
2016-2019
Seattle University
2014-2018
Health and Environmental Sciences Institute
2014-2018
Bioengineering Center
2018
Massachusetts Institute of Technology
2011-2016
University of Manitoba
2013
Fog represents a large untapped source of potable water, especially in arid climates. Numerous plants and animals use textural chemical features on their surfaces to harvest this precious resource. In work, we investigate the influence surface wettability characteristics, length scale, weave density fog-harvesting capability woven meshes. We develop combined hydrodynamic model predict overall fog-collection efficiency meshes cast findings form design chart. Two limiting constraints govern...
Compared to the significant body of work devoted surface engineering for promoting dropwise condensation heat transfer steam, much less attention has been dedicated fluids with lower interfacial tension. A vast array low-surface tension such as hydrocarbons, cryogens, and fluorinated refrigerants are used in a number industrial applications, development passive means increasing their coefficients potential efficiency enhancements. Here we investigate behavior variety liquids tensions range...
We demonstrate a reduction in the measured inner wall shear stress moderately turbulent Taylor-Couette flows by depositing sprayable superhydrophobic microstructures on rotor surface. The magnitude of becomes progressively larger as Reynolds number increases up to value 22% at $\mathrm{Re}=8.0\ifmmode\times\else\texttimes\fi{}1{0}^{4}$. show that mean skin friction coefficient ${C}_{f}$ presence coating can be fitted modified Prandtl--von K\'arm\'an--type relationship form...
Gravity-induced sagging can amplify variations in goniometric measurements of the contact angles sessile drops on super-liquid-repellent surfaces. The very large value effective angle leads to increased optical noise drop profile near solid-liquid free surface and progressive failure simple geometric approximations. We demonstrate a systematic approach determining super-repellent use perturbation solution Bashforth-Adams equation estimate water, ethylene glycol, diiodomethane an omniphobic...
We estimate the effective Navier-slip length for flow over a spray-fabricated liquid-repellent surface which supports composite solid–air–liquid interface or 'Cassie–Baxter' state. The morphology of coated substrate consists randomly distributed corpuscular microstructures encapsulate film trapped air (or 'plastron') upon contact with liquid. reduction in viscous skin friction due to plastron is evaluated using torque measurements parallel plate rheometer resulting measured slip bslip ≈ 39...
Establishing a vapor film on low-temperature Leidenfrost surface leads to 80 90% drag reduction in turbulent flow.
Digital holographic microscopy is used for characterizing the profiles of mean velocity, viscous and Reynolds shear stresses, as well turbulence level in inner part turbulent boundary layers over several super-hydrophobic surfaces (SHSs) with varying roughness/texture characteristics. The friction numbers vary from 693 to 4496, normalized root square values roughness $(k_{rms}^{+})$ 0.43 3.28. wall stress estimated sum at top elements slip velocity obtained profile same elevation. For flow...
Bacterial swarming and biofilm formation are collective multicellular phenomena through which diverse microbial species colonize spread over water-permeable tissue. During both modes of surface translocation, fluid uptake transport play a key role in shaping the overall morphology spreading dynamics. Here we develop generalized two-phase thin-film model that couples bacterial growth, extracellular matrix swelling, flow, nutrient to describe expansion highly motile swarms, sessile biofilms....
Birds in the cormorant (Phalacrocoracidae) family dive tens of metres into water to prey on fish while entraining a thin layer air (a plastron film) within microstructures their feathers. In addition, many species spread wings for long periods time upon emerging from water. To investigate whether wetting and wing-spreading are related feather structure, microscopy photographic studies have previously been used extract structural parameters barbs barbules. this work, we describe systematic...
pH-responsive endosomalytic brushes capable of spontaneously self-assembling into polymersomes were synthesized by RAFT and the intracellular delivery antibiotic drugs was investigated.
Goniometric techniques traditionally quantify two parameters, the advancing and receding contact angles, that are useful for characterizing wetting properties of a solid surface; however, dynamic tensiometry, which measures changes in net force on surface during repeated immersion emersion into probe liquid, can provide further insight surface. We detail framework analyzing tensiometric results allows determination hysteresis, state transitions, characteristic topographical length scales...
Commercially available woven fabrics (e.g., nylon- or PET-based fabrics) possess inherently re-entrant textures in the form of cylindrical yarns and fibers. We analyze liquid repellency nanotextured oleophobic using a nested model with n levels hierarchy that is constructed from modular units spherical building blocks. At each level hierarchy, density topographical features captured dimensionless textural parameter D(n)*. For plain-woven mesh comprised chemically treated fiber bundles (n =...
Reversible addition–fragmentation chain transfer (RAFT) polymerization was employed to prepare prodrug polymer carrier systems with the chemotherapeutic agent camptothecin (Cam) and kinase inhibitor dasatinib (Dt).
Aqueous reversible addition-fragmentation chain transfer (RAFT) polymerization was employed to prepare a series of linear copolymers N,N-dimethylacrylamide (DMA) and 2-hydroxyethylacrylamide (HEAm) with narrow Đ values over molecular weight range spanning three orders magnitude (103 106 Da). Trithiocarbonate-based RAFT agents (CTAs) were grafted onto these scaffolds using carbodiimide chemistry catalyzed DMAP. The resultant graft agent (gCTA) subsequently synthesize polymeric brushes number...
Radiant star nanoparticle prodrugs were synthesized in a two-step process by first homopolymerizing RAFT transmers followed copolymerization from the hyperbranched polymer core.
The linear stability of a thin viscous sheet stretched by extensional flow under an imposed heating profile is studied. Growth rates unstable modes are found, depending on flow. instability shown to be localized in two regions and changes from static Hopf bifurcation with changing
The drug substance administered by any route must possess some aqueous solubility for systemic absorption. For this purpose, is one of the most important parameter to achieve desired concentration in circulation therapeutic response. However, more than 40% new chemical entities exhibit poor and present a major challenge modern delivery system, because their low bioavailability. Self-emulsifying systems (SEDDS) are usually used improve bioavailability hydrophobic drugs. Conventional SEDDS,...
Bacterial swarming and biofilm formation are collective multicellular phenomena through which diverse microbial species colonize spread over water-permeable tissue. During both modes of surface translocation, fluid uptake transport play a key role in shaping the overall morphology spreading dynamics. Here, using Bacillus subtilis as our model experimental system, we develop generalized two-phase thin-film that couples hydrodynamics, mechanics, osmotic flux nutrient to describe expansion...