Ayusman Sen
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View article: Droplets as Cell Models: Chemical Gradient-Induced Directional Filopodia Formation
Droplets as Cell Models: Chemical Gradient-Induced Directional Filopodia Formation Open
Cells are complex chemical systems capable of sensing and responding to environmental cues by dynamically reshaping themselves, e.g. by forming arm-like protrusions such as filopodia. Recapitulating cellular behavior in artificial systems …
View article: A roadmap for next-generation nanomotors
A roadmap for next-generation nanomotors Open
Since their discovery in 2004, there has been remarkable progress in research on nanomotors, from the elucidation of different propulsion mechanisms to the study of their collective behaviour, culminating in investigations into their appli…
View article: Technology Roadmap of Micro/Nanorobots
Technology Roadmap of Micro/Nanorobots Open
Inspired by Richard Feynman's 1959 lecture and the 1966 film Fantastic Voyage, the field of micro/nanorobots has evolved from science fiction to reality, with significant advancements in biomedical and environmental applications. Despite t…
View article: Nonequilibrium surfactant partitioning into microdroplets generates local phase inversion conditions and interfacial instability
Nonequilibrium surfactant partitioning into microdroplets generates local phase inversion conditions and interfacial instability Open
Droplets far from equilibrium experience different compositions and local environments compared with bulk oil and water phases at equilibrium. Understanding the pathways involved in emulsion progression towards equilibrium is valuable for …
View article: Uncovering Chemical Principles Governing Nanophase Formation in Ternary Solvents
Uncovering Chemical Principles Governing Nanophase Formation in Ternary Solvents Open
Nanoscopic phases, such as oil‐enriched pockets dispersed in water, have been observed in ternary mixtures of oil, water, and cosolvent in the absence of surfactants. Such nanophases are found across a portion of compositions within the si…
View article: Uncovering Chemical Principles Governing Nanophase Formation in Ternary Solvents
Uncovering Chemical Principles Governing Nanophase Formation in Ternary Solvents Open
Nanoscopic phases, such as oil‐enriched pockets dispersed in water, have been observed in ternary mixtures of oil, water, and cosolvent in the absence of surfactants. Such nanophases are found across a portion of compositions within the si…
View article: Non-reciprocal Chemotactic Movement in Enzyme Cascade Under Flow-Free Conditions
Non-reciprocal Chemotactic Movement in Enzyme Cascade Under Flow-Free Conditions Open
The chemotactic guiding of particles using chemical gradients is an important area of research because of possible applications in drug and cargo delivery to specific locations. In addition, the experimental demonstration of non-reciprocal…
View article: Nanomotors: 20 years anniversary and future roadmap
Nanomotors: 20 years anniversary and future roadmap Open
Since their discovery in 2004, there has been remarkable progress in research on nanomotors starting with the elucidation of different propulsion mechanisms to the study of their collective behavior, culminating in investigations into thei…
View article: Ionic gradients in flow to control the transport of emissive ions
Ionic gradients in flow to control the transport of emissive ions Open
Concentration gradients of simple salts in microfluidic channels control the transport of a common photo-redox catalyst.
View article: Ionic gradients in flow to control transport of emissive ions
Ionic gradients in flow to control transport of emissive ions Open
Concentration gradients of simple salts in microfluidic channels control the transport of a common photoredox catalyst.
View article: Introduction to Active Colloids
Introduction to Active Colloids Open
This chapter provides an overview of the entire research field of active colloids ranging from molecules to microparticles, spanning their types, propulsion mechanisms, collective behavior, applications, and key research frontiers. The goa…
View article: Ionic gradients in flow to control the transport of emissive ions
Ionic gradients in flow to control the transport of emissive ions Open
Concentration gradients of simple salts in microfluidic channels control the transport of a common photo-redox catalyst.
View article: Ionic gradients in flow to control the transport of emissive ions
Ionic gradients in flow to control the transport of emissive ions Open
Concentration gradients of simple salts in microfluidic channels control the transport of a common photo-redox catalyst.
View article: Uncovering chemical principles governing nanophase formation in ternary solvents
Uncovering chemical principles governing nanophase formation in ternary solvents Open
Nanoscopic phases, such as oil-enriched pockets dispersed in water, have been observed in ternary mixtures of oil, water, and cosolvent in the absence of surfactants. Such nanophases are found across a portion of compositions within the si…
View article: Roadmap for Animate Matter
Roadmap for Animate Matter Open
Humanity has long sought inspiration from nature to innovate materials and devices. As science advances, nature-inspired materials are becoming part of our lives. Animate materials, characterized by their activity, adaptability, and autono…
View article: A Chemical Mechanism for the Bistable‐to‐Oscillatory Transition in Colloidal Aggregates of Silver Phosphate
A Chemical Mechanism for the Bistable‐to‐Oscillatory Transition in Colloidal Aggregates of Silver Phosphate Open
We previously reported collective behavior in colloidal aggregates of silver phosphate in H 2 O 2 and under UV light. Diffusiophoretic interactions between aggregates lead to non‐linear behavior such as oscillations and synchronization, in…
View article: Programming Fluid Motion Using Multi-Enzyme Micropump Systems
Programming Fluid Motion Using Multi-Enzyme Micropump Systems Open
In the presence of appropriate substrates, surface-anchored enzymes can act as pumps and propel fluid through microchambers. Understanding the dynamic interplay between catalytic reactions and fluid flow is vital to enhancing the accuracy …
View article: Self‐Propelling Macroscale Sheets Powered by Enzyme Pumps
Self‐Propelling Macroscale Sheets Powered by Enzyme Pumps Open
Nanoscale enzymes anchored to surfaces act as chemical pumps by converting chemical energy released from enzymatic reactions into spontaneous fluid flow that propels entrained nano‐ and microparticles. Enzymatic pumps are biocompatible, hi…
View article: Self‐Propelling Macroscale Sheets Powered by Enzyme Pumps
Self‐Propelling Macroscale Sheets Powered by Enzyme Pumps Open
Nanoscale enzymes anchored to surfaces act as chemical pumps by converting chemical energy released from enzymatic reactions into spontaneous fluid flow that propels entrained nano‐ and microparticles. Enzymatic pumps are biocompatible, hi…
View article: Dynamic Oscillation and Motion of Oil‐in‐Water Emulsion Droplets
Dynamic Oscillation and Motion of Oil‐in‐Water Emulsion Droplets Open
The interplay of interfacial tensions on droplets results in a range of self‐powered motions that mimic those of living systems and serve as a tunable model to understand their complex non‐equilibrium behavior. Spontaneous shape deformatio…
View article: Dynamic Oscillation and Motion of Oil‐in‐Water Emulsion Droplets
Dynamic Oscillation and Motion of Oil‐in‐Water Emulsion Droplets Open
The interplay of interfacial tensions on droplets results in a range of self‐powered motions that mimic those of living systems and serve as a tunable model to understand their complex non‐equilibrium behavior. Spontaneous shape deformatio…
View article: One-step catalytic conversion of biomass-derived carbohydrates to liquid fuels
One-step catalytic conversion of biomass-derived carbohydrates to liquid fuels Open
The invention relates to a method for manufacture of hydrocarbon fuels and oxygenated hydrocarbon fuels such as alkyl substituted tetrahydrofurans such as 2,5-dimethyltetrahydrofuran, 2-methyltetrahydrofuran, 5-methylfurfural and mixtures …
View article: Ultrasound Manipulation and Extrusion of Active Nanorods
Ultrasound Manipulation and Extrusion of Active Nanorods Open
Synthetic self‐propelled nano and microparticles have a growing appeal for targeted drug delivery, collective functionality, and manipulation at the nanoscale. However, it is challenging to control their positions and orientations under co…
View article: Palladium (II) catalyized polymerization of norbornene and acrylates
Palladium (II) catalyized polymerization of norbornene and acrylates Open
Homopolymers or copolymers of acrylates, homopolymers or copolymers of norbornenes, and copolymers of acrylates with norbornenes, may be prepared by contacting acrylate and/or norbornene monomer reactant under polymerization conditions and…
View article: Highly selective catalytic process for synthesizing 1-hexene from ethylene
Highly selective catalytic process for synthesizing 1-hexene from ethylene Open
Ethylene is trimerized to form 1-hexene, at a selectivity of up to about 99 mole percent, by contacting ethylene, at an ethylene pressure of from about 200-1500 psig and at a reaction temperature of from about 0.degree. C. to about 100.deg…
View article: Process for the conversion of methane
Process for the conversion of methane Open
A process for the facile two-step synthesis of methanol from methane is disclosed. In accordance with the invention, an appropriate combination of initiator and reaction medium is employed to achieve methane conversion in very high selecti…
View article: Palladium (II) catalyized polymers of norbornene and acrylates
Palladium (II) catalyized polymers of norbornene and acrylates Open
Homopolymers or copolymers of acrylates, homopolymers or copolymers of norbornenes, and copolymers of acrylates with norbornenes, may be prepared by contacting acrylate and/or norbornene monomer reactant under polymerization conditions and…
View article: Substantially isotactic, linear, alternating copolymers of carbon monoxide and an olefin
Substantially isotactic, linear, alternating copolymers of carbon monoxide and an olefin Open
The compound, [Pd(Me-DUPHOS)(MeCN).sub.2 ](BF.sub.4).sub.2, [Me-DUPHOS: 1,2-bis(2,5-dimethylphospholano)benzene] is an effective catalyst for the highly enantioselective, alternating copolymerization of olefins, such as aliphatic .alpha.-o…
View article: Metal catalyzed synthesis of hyperbranched ethylene and/or .alpha.-olefin polymers
Metal catalyzed synthesis of hyperbranched ethylene and/or .alpha.-olefin polymers Open
Oily hyperbranched polymers derived from ethylene, propylene, butene and/or a C.sub.5 -C.sub.24 .alpha.-olefin, and a method for their synthesis, are disclosed. The polymers have non-regular microstructures and are characterized by a ratio…