A5083295321- Material Dynamics and Properties
- Rheology and Fluid Dynamics Studies
- Cellular Mechanics and Interactions
- Polysaccharides Composition and Applications
- Surfactants and Colloidal Systems
- Food Chemistry and Fat Analysis
- Advancements in Battery Materials
- Petroleum Processing and Analysis
- Pickering emulsions and particle stabilization
- Enhanced Oil Recovery Techniques
- Advanced Battery Technologies Research
- Advanced Battery Materials and Technologies
- 3D Printing in Biomedical Research
- Hydrogels: synthesis, properties, applications
- Lubricants and Their Additives
- Soil and Unsaturated Flow
- NMR spectroscopy and applications
- Theoretical and Computational Physics
- Microplastics and Plastic Pollution
- Spaceflight effects on biology
- Fluid Dynamics and Thin Films
- Tissue Engineering and Regenerative Medicine
- Recycling and Waste Management Techniques
- Mobile Ad Hoc Networks
- Particle Dynamics in Fluid Flows
Indian Institute of Technology Bombay
2015-2025
The University of Texas at Austin
2008-2011
Concentrated suspensions of soft deformable particles, e.g., polymer microgel pastes and compressed emulsions, display a generic slip behavior [Meeker et al., J. Rheol. 92, 18302 (2004a); Meeker 48, 1295–1320 (2004b)]. When sheared with smooth surfaces, they exhibit apparent motion due to at the wall. Wall-slip stops sliding yield stress value which is much lower than bulk stress. The physical mechanism low stresses origin have so far been unresolved issues. We propose that paste-wall...
We use fluorescence microscopy and particle tracking velocimetry to image the motion of concentrated emulsions microgel suspensions near solid surfaces. The local deformation involves a combination slip bulk flow, which are found be controlled by surface forces. With smooth surfaces, two mechanisms identified depending on whether particle–wall interactions repulsive or weakly attractive. In former case, materials yield uniformly rheology can mapped macroscopic flow curve. latter yielding is...
Soft microgel pastes are modeled as a three-dimensional system of randomly packed elastic spheres. Simulations performed wherein the packing is subject to isochoric uniaxial extension compute high- and low-frequency shear moduli for various fractions. The simulation results agree well with data from experiments on crosslinked polymer microgels. modulus found follow osmotic pressure (the mean normal stress) closely, especially at high In addition, expressions involving radial distribution...
This study explores the use of electric fields to mitigate challenges in transporting crude oil, specifically addressing issue increased viscosity due wax network formation. Using a parallel plate shear rheometer, significant reduction is observed across various rates (5–50 s−1) when applying constant field (2–3 kV/mm) waxy oil. The follows an exponential decay over time, attributed breakdown network. relationship between time this with rate and volume fraction crystallized also explored....
Cell migration regulates central life processes including embryonic development, tissue regeneration, and tumor invasion. To establish the direction of migration, cells follow exogenous cues. Durotaxis, directed cell toward elastic stiffness gradients, is classical example mechanical taxis. However, whether gradients relaxation properties in extracellular matrix may also induce tactic responses (viscotaxis) not well understood. Moreover, how durotaxis viscotaxis interact with each other has...
Polyethyleneimine (PEI), a cationic polyelectrolyte, finds great utility as nonviral gene transfection vector. The mechanism of delivery process across the cell membrane through PEI-based polyplexes is still much debated; however, general consensus that proton binding-based PEI conformational changes occur pH alters during process. Taking step back, even understanding wide range (from 1 to 10) dependent for neat in explicit water remains elusive. In pursuit this objective, using combination...
The crystallization behavior of commercial mono- and diglycerides (MDG) in paraffin oil is studied to develop an in-depth understanding the polymorphic transitions useful for physical stability petroleum oil-based topical emulsions. Optical microscopy differential scanning calorimetry measurements showed formation plate-like spherulite crystals at high low temperatures, sequence, while cooling a solution MDG dissolved oil. High-resolution NMR X-ray scattering demonstrate that...
Liquefaction of the wax network in crude oil by an electric field.
Integration of molecular liquid crystals (LCs) with functional proteins can provide new class materials for potential applications in optical biosensing. However, hydrophobic nematic LCs (length ∼ 1–2 nm) and hydrophilic proteins, size O (nm), do not intermix without chemical modification at least one them. Bioconjugation a polyethylene glycol-based polymeric surfactant (PS) core–shell system that is sequestered within nonaqueous LC (4-cyano-4′-pentylbiphenyl) microdroplets. the nature...
Crystallization of organic crystals from solutions is used in many industries. Depending on the application, control over size and shape often desired achieved by tailoring process parameters such as rate cooling and/or shear rate, or via use certain additives. In this study, effect Span 80 crystallization stearic acid its supersaturated solution mineral oil presented. The growth C-form has been determined to increase almost quadratically with relative supersaturation. presence 80, was much...
Abstract Directed cell migration in response to chemical and mechanical gradients plays a crucial role physiological pathological conditions. One such cues that is known influences the gradient of substrate elastic modulus ( E ). However, alone cannot fully define material properties cellular microenvironment, which often has both viscous characteristics. In this study, we investigated influence nature, as defined by loss modulus, G”, on migration. We cultured human mesenchymal stem cells...
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The hydrodynamic behavior of fractal aggregates plays an important role in various applications industry and the environment, has been a topic interest over past several decades. Despite this, crucial aspects such as relationship mobility radius, Rm, with respect to dimension, df, fluid penetration depth, δ, have largely remained unexplored. Herein, we examine these across wide range df's through Stokesian dynamics approach. It takes into account all orders monomer-monomer interactions...
Understanding the evolution of aerosol metrics in Continuously Stirred Aerosol Reactors (CSTAR) is considerable importance for generation and synthesis particles with controlled size morphological properties. Generally, dynamic equations governing depletion precursor monomer species as well are solved by method moments. These provide a simpler, alternative system ordinary differential place complicated integro-partial general dynamics equation entire distribution function. A fundamental...