Small power: Autonomous nano-and micromotors propelled by self-generated gradients

W Wang, W Duan, S Ahmed, TE Mallouk, A Sen - Nano Today, 2013 - Elsevier
In this article we review the development, current status and future prospects of nano- and
microscale motors propelled by locally generated fields and chemical gradients. These motors …

Steering acoustically propelled nanowire motors toward cells in a biologically compatible environment using magnetic fields

S Ahmed, W Wang, LO Mair, RD Fraleigh, S Li… - Langmuir, 2013 - ACS Publications
The recent discovery of fuel-free propulsion of nanomotors using acoustic energy has provided
a new avenue for using nanomotors in biocompatible media. Crucial to the application of …

Acoustic propulsion of nanorod motors inside living cells

W Wang, S Li, L Mair, S Ahmed… - Angewandte Chemie …, 2014 - Wiley Online Library
The ultrasonic propulsion of rod‐shaped nanomotors inside living HeLa cells is demonstrated.
These nanomotors (gold rods about 300 nm in diameter and about 3 μm long) attach …

Density and shape effects in the acoustic propulsion of bimetallic nanorod motors

S Ahmed, W Wang, L Bai, DT Gentekos, M Hoyos… - ACS …, 2016 - ACS Publications
Bimetallic nanorods are propelled without chemical fuels in megahertz (MHz) acoustic fields,
and exhibit similar behaviors to single-metal rods, including autonomous axial propulsion …

From one to many: Dynamic assembly and collective behavior of self-propelled colloidal motors

W Wang, W Duan, S Ahmed, A Sen… - Accounts of chemical …, 2015 - ACS Publications
Conspectus The assembly of complex structures from simpler, individual units is a hallmark
of biology. Examples include the pairing of DNA strands, the assembly of protein chains into …

Shape-directed microspinners powered by ultrasound

S Sabrina, M Tasinkevych, S Ahmed, AM Brooks… - ACS …, 2018 - ACS Publications
The propulsion of micro- and nanoparticles using ultrasound is an attractive strategy for the
remote manipulation of colloidal matter using biocompatible energy inputs. However, the …

Self-assembly of nanorod motors into geometrically regular multimers and their propulsion by ultrasound

S Ahmed, DT Gentekos, CA Fink, TE Mallouk - ACS nano, 2014 - ACS Publications
Segmented gold–ruthenium nanorods (300 ± 30 nm in diameter and 2.0 ± 0.2 μm in length)
with thin Ni segments at one end assemble into few-particle, geometrically regular dimers, …

Kilohertz rotation of nanorods propelled by ultrasound, traced by microvortex advection of nanoparticles

…, LO Mair, PP Mathai, PN Patrone, W Wang, S Ahmed… - ACS …, 2014 - ACS Publications
We measure the microvortical flows around gold nanorods propelled by ultrasound in water
using polystyrene nanoparticles as optical tracers. We infer the rotational frequencies of …

Phosphorus Schiff base ligand and its complexes: Experimental and theoretical investigations

…, AAS Al‐Hamdani, SD Ahmed… - Applied …, 2020 - Wiley Online Library
A phosphorus‐containing Schiff base was prepared from bis{3‐[2‐(4‐amino‐1,5‐dimethyl‐2‐phenylpyrazol‐3‐ylideneamino)ethyl]indol‐1‐ylmethyl}phosphinic
acid and …

Synthesis and bioactivity studies of novel Schiff bases and their complexes

…, AAS Al‐Hamdani, SD Ahmed… - Journal of physical …, 2019 - Wiley Online Library
The new Schiff base (L) “4‐[(2,4‐dimethoxy‐benzylidene)‐amino]‐1,5‐dimethyl‐2‐phenyl‐1,2‐dihydro‐pyrazol‐3‐one”
was synthesized from 2,4‐dimethoxy‐benzaldehyde and 4‐…