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2,151 results
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Chemotaxis of nonbiological colloidal rods.
Hong Y, Blackman NM, Kopp ND, Sen A, Velegol D. Hong Y, et al. Among authors: sen a. Phys Rev Lett. 2007 Oct 26;99(17):178103. doi: 10.1103/PhysRevLett.99.178103. Epub 2007 Oct 26. Phys Rev Lett. 2007. PMID: 17995374
Chemotaxis is the movement of organisms toward or away from a chemical attractant or toxin by a biased random walk process. Here we describe the first experimental example of chemotaxis outside biological systems. ...Brownian dynamics simulations reveal that no "tem …
Chemotaxis is the movement of organisms toward or away from a chemical attractant or toxin by a biased random walk process. He …
Catalytic nanomotors: autonomous movement of striped nanorods.
Paxton WF, Kistler KC, Olmeda CC, Sen A, St Angelo SK, Cao Y, Mallouk TE, Lammert PE, Crespi VH. Paxton WF, et al. Among authors: sen a. J Am Chem Soc. 2004 Oct 20;126(41):13424-31. doi: 10.1021/ja047697z. J Am Chem Soc. 2004. PMID: 15479099
Experiments in ethanol-water solutions confirmed that the velocity depends linearly with the product Sgamma, and scaling experiments showed a strong dependence of the velocity on R and L. ...
Experiments in ethanol-water solutions confirmed that the velocity depends linearly with the product Sgamma, and scaling experiments showed …
A "grow-in-place" architecture and methodology for electrochemical synthesis of conducting polymer nanoribbon device arrays.
Peng CY, Kalkan AK, Fonash SJ, Gu B, Sen A. Peng CY, et al. Among authors: sen a. Nano Lett. 2005 Mar;5(3):439-44. doi: 10.1021/nl048083v. Nano Lett. 2005. PMID: 15755091
Fully enclosed horizontal nanochannels, in a prearranged array on a substrate and with built-in electrical contacts and chemical access regions, were used as growth templates for electrochemical synthesis of conducting polymer nanoribbons. ...Conductivity studies, d …
Fully enclosed horizontal nanochannels, in a prearranged array on a substrate and with built-in electrical contacts and chemic …
Motility of catalytic nanoparticles through self-generated forces.
Paxton WF, Sen A, Mallouk TE. Paxton WF, et al. Among authors: sen a. Chemistry. 2005 Nov 4;11(22):6462-70. doi: 10.1002/chem.200500167. Chemistry. 2005. PMID: 16052651
However, the autonomous movement of catalytic nanoparticles by self-generated forces is a relatively unexplored area in colloid and interfacial chemistry. ...
However, the autonomous movement of catalytic nanoparticles by self-generated forces is a relatively unexplored area in colloid and i …
Catalytic micropumps: microscopic convective fluid flow and pattern formation.
Kline TR, Paxton WF, Wang Y, Velegol D, Mallouk TE, Sen A. Kline TR, et al. Among authors: sen a. J Am Chem Soc. 2005 Dec 14;127(49):17150-1. doi: 10.1021/ja056069u. J Am Chem Soc. 2005. PMID: 16332039
We report an ambient temperature stationary "pump" that generates a proton concentration gradient through the bipolar electrochemical decomposition of hydrogen peroxide on patterned silver-gold surfaces. The resulting electric field drives convective fluid flow and pattern …
We report an ambient temperature stationary "pump" that generates a proton concentration gradient through the bipolar electrochemical …
Reversible pattern formation through photolysis.
Kline TR, Sen A. Kline TR, et al. Among authors: sen a. Langmuir. 2006 Aug 15;22(17):7124-7. doi: 10.1021/la061165+. Langmuir. 2006. PMID: 16893201
We report a photolytic method to induce spatial and temporal patterning/deposition of particles at the micron scale on a time scale of seconds. ...Diffusiophoretic motion due to a spatially defined ion gradient accounts for our observations. Atomic force and …
We report a photolytic method to induce spatial and temporal patterning/deposition of particles at the micron scale on a time …
Catalytically induced electrokinetics for motors and micropumps.
Paxton WF, Baker PT, Kline TR, Wang Y, Mallouk TE, Sen A. Paxton WF, et al. Among authors: sen a. J Am Chem Soc. 2006 Nov 22;128(46):14881-8. doi: 10.1021/ja0643164. J Am Chem Soc. 2006. PMID: 17105298
Accordingly, we observed a linear relationship between bimetallic rod speed and the resistivity of the bulk solution. Previous observations relating a decrease in speed to an increase in ethanol concentration can be explained in terms of a decrease in current …
Accordingly, we observed a linear relationship between bimetallic rod speed and the resistivity of the bulk solution. Previous observ …
Bipolar electrochemical mechanism for the propulsion of catalytic nanomotors in hydrogen peroxide solutions.
Wang Y, Hernandez RM, Bartlett DJ Jr, Bingham JM, Kline TR, Sen A, Mallouk TE. Wang Y, et al. Among authors: sen a. Langmuir. 2006 Dec 5;22(25):10451-6. doi: 10.1021/la0615950. Langmuir. 2006. PMID: 17129015
We also find that segmented nanorods with one Au end and one poly(pyrrole) end containing catalase, an enzyme that decomposes hydrogen peroxide nonelectrochemically, perform the overall catalytic reaction at a rate similar to that of nanorods containing Au and Pt segments. …
We also find that segmented nanorods with one Au end and one poly(pyrrole) end containing catalase, an enzyme that decomposes hydrogen perox …
Catalytically driven colloidal patterning and transport.
Kline TR, Iwata J, Lammert PE, Mallouk TE, Sen A, Velegol D. Kline TR, et al. Among authors: sen a. J Phys Chem B. 2006 Dec 7;110(48):24513-21. doi: 10.1021/jp064393l. J Phys Chem B. 2006. PMID: 17134210
We recently reported the convection and pattern formation of tracers caused by a catalytically generated electric field. The electric field arises due to the heterogeneous electrochemical reduction and oxidation of hydrogen peroxide (H2O2) on silver (Ag) and gold (Au), res …
We recently reported the convection and pattern formation of tracers caused by a catalytically generated electric field. The electric …
Directed rotational motion of microscale objects using interfacial tension gradients continually generated via catalytic reactions.
Catchmark JM, Subramanian S, Sen A. Catchmark JM, et al. Among authors: sen a. Small. 2005 Feb;1(2):202-6. doi: 10.1002/smll.200400061. Small. 2005. PMID: 17193430 No abstract available.
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