Raj Kumar Manna

Raj Kumar Manna
University of Pittsburgh | Pitt · Chemical and Petroleum Engineering

Doctor of Philosophy

About

20
Publications
1,233
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121
Citations

Publications

Publications (20)
Article
Full-text available
Catalytic reactions on flexible sheets generate fluid flows that transform the shape of the sheet, which in turn modifies the flow. These complex interactions make computer models vital for designing and harnessing these feedback loops to create soft active matter that autonomously performs self-sustained mechanical work.
Article
In living organisms, diffusing chemicals react with soft tissue to actuate a range of mechanical actions, such as periodic pulsations or net motion. Inspired by this biological behaviour, researchers have created chemically active ‘microswimmers’ that translate chemical input into mechanical work. Because typical microswimmers are hard spheres (tha...
Article
Illuminating an aqueous solution of plasmonic gold or silver nanoparticles with ultraviolet (UV) light generates convective flows. These convective flows can be harnessed to move, assemble, and separate larger microparticles on an incline. More information can be found in the Communication by Anna C. Balazs, Ayusman Sen et al.
Article
The synchronization of self-oscillating systems is vital to various biological functions, from the coordinated contraction of heart muscle to the self-organization of slime molds. Through modeling, we design bioinspired materials systems that spontaneously form shape-changing self-oscillators, which communicate to synchronize both their temporal an...
Article
Achieving directed motility and separation of colloidal particles is a crucial requirement in a range of technological areas. Herein, we describe a system that exploits the photothermal properties of plasmonic nanoparticles for the assembly and separation of larger microparticles. Irradiating an aqueous suspension of gold or silver nanoparticles wi...
Article
To fully realize the potential of microfluidic platforms as useful diagnostic tools, the devices must be sufficiently portable that they function at the point-of-care, as well as remote and resource-poor locations. Using both modeling and experiments, here we develop a standalone fluidic device that is driven by light and operates without the need...
Article
Two-dimensional responsive materials that change shape into complex three-dimensional structures are valuable for creating systems ranging from wearable electronics to soft robotics. Typically, the final 3D structure is unique and predetermined through the materials’ processing. Here, we use theory and simulation to devise a distinctive approach fo...
Article
Living cells self-organize to perform various complex tasks that a single cell alone could not accomplish. Few synthetic nano- or micro-scale objects can autonomously carry out comparable coordinated behavior. We develop computational models to design fluid-filled microchambers containing both nano- and micro-particles that convert inputs of therma...
Article
Using computational modeling, we design a facile method for sorting particles of different sizes in a fluid-filled microchamber. The microchamber is inclined at an angle with respect to the horizontal direction and contains suspended gold nanoparticles, as well as the microparticles. With the application of UV light, the heat generated by illuminat...
Article
Polymeric fluids show a wealth of topological phenomena, from entanglement and reptation at microscales to orientational ordering and defect production at macroscales, which can be explained by statistical-mechanical theories. In the presence of activity, the latter must be augmented by forces that cause spontaneous chain motion and fluid flow. Her...
Article
Full-text available
Active colloids are not constrained by equilibrium: ballistic propulsion, superdiffusive behaviour or enhanced diffusivities have been reported for active Janus particles. Faster-than-equilibrium dynamics of active systems have implications for their use in drug delivery and micromixing. Further, at high concentrations, interactions between active...
Article
Enhanced colloidal transport beyond the limit imposed by diffusion is usually achieved through external fields. Here, we demonstrate the ballistic transport of a colloidal sphere using internal sources of energy provided by an attached active filament. The latter is modeled as a chain of chemo-mechanically active beads connected by potentials that...
Article
The configurational dynamics of a polyelectrolyte (PE), subjected to a simple shear flow, is studied using Brownian dynamics (BD) and Dissipative Particle Dynamics (DPD) simulations of a bead-spring model with explicit counterions. We explore the effect of counterion condensation on the tumbling and extension of PEs by varying the shear rates for a...
Article
Full-text available
We have analytically explored finite size and interparticle interaction corrections to the average energy of a harmonically trapped Fermi gas below and above the Fermi temperature, and have obtained a better fitting for the excess energy reported by DeMarco and Jin [Science $\textbf{285}$, 1703 (1999)]. We have presented a perturbative calculation...

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