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Nanomotors

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https://www.readbyqxmd.com/read/29434262/revolving-supramolecular-chiral-structures-powered-by-light-in-nanomotor-doped-liquid-crystals
#1
Tetiana Orlova, Federico Lancia, Charles Loussert, Supitchaya Iamsaard, Nathalie Katsonis, Etienne Brasselet
Molecular machines operated by light have been recently shown to be able to produce oriented motion at the molecular scale1,2 as well as do macroscopic work when embedded in supramolecular structures3-5. However, any supramolecular movement irremediably ceases as soon as the concentration of the interconverting molecular motors or switches reaches a photo-stationary state6,7. To circumvent this limitation, researchers have typically relied on establishing oscillating illumination conditions-either by modulating the source intensity8,9 or by using bespoke illumination arrangements10-13...
February 12, 2018: Nature Nanotechnology
https://www.readbyqxmd.com/read/29411445/progress-toward-catalytic-micro-and-nanomotors-for-biomedical-and-environmental-applications
#2
REVIEW
Muhammad Safdar, Shahid Ullah Khan, Janne Jänis
Synthetic micro- and nanomotors (MNMs) are tiny objects that can autonomously move under the influence of an appropriate source of energy, such as a chemical fuel, magnetic field, ultrasound, or light. Chemically driven MNMs are composed of or contain certain reactive material(s) that convert chemical energy of a fuel into kinetic energy (motion) of the particles. Several different materials have been explored over the last decade for the preparation of a wide variety of MNMs. Here, the discovery of materials and approaches to enhance the efficiency of chemically driven MNMs are reviewed...
February 7, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29393328/self-propulsion-of-catalytic-nanomotors-synthesised-by-seeded-growth-of-asymmetric-platinum-gold-nanoparticles
#3
Ibon Santiago, Luyun Jiang, John Foord, Andrew J Turberfield
Asymmetric bimetallic nanomotors are synthesised by seeded growth in solution, providing a convenient and high-throughput alternative to the usual top-down lithographic fabrication of self-propelled catalytic nanoparticles. These synthetic nanomotors catalyse H2O2 decomposition and exhibit enhanced diffusion that depends on fuel concentration, consistent with their chemical propulsion.
February 2, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29386127/the-biological-role-of-the-%C3%AE-subunit-as-unidirectional-inhibitor-of-the-f1fo-atpase-of-paracoccus-denitrificans
#4
Francisco Mendoza-Hoffmann, Ángeles Pérez-Oseguera, Miguel Ángel Cevallos, Mariel Zarco-Zavala, Raquel Ortega, Claudia Peña-Segura, Emilio Espinoza-Simón, Salvador Uribe-Carvajal, José J García-Trejo
The biological roles of the three natural F1FO-ATPase inhibitors, ε, ζ, and IF1, on cell physiology remain controversial. The ζ subunit is a useful model for deletion studies since it mimics mitochondrial IF1, but in the F1FO-ATPase of Paracoccus denitrificans (PdF1FO), it is a monogenic and supernumerary subunit. Here, we constructed a P. denitrificans 1222 derivative (PdΔζ) with a deleted ζ gene to determine its role in cell growth and bioenergetics. The results show that the lack of ζ in vivo strongly restricts respiratory P...
January 23, 2018: Cell Reports
https://www.readbyqxmd.com/read/29361216/medical-imaging-for-the-tracking-of-micromotors
#5
Diana Vilela, Unai Cossío, Jemish Parmar, Vanessa Gómez-Vallejo, Angel Manu Martínez, Jordi Llop, Samuel Sanchez
Micro/nanomotors are useful tools for several biomedical applications, including targeted drug delivery and minimally invasive microsurgeries. However, major challenges such as in vivo imaging need to be addressed before they can be safely applied on a living body. Here, we show that positron emission tomography (PET), a molecular imaging technique widely used in medical imaging, can also be used to track a large population of tubular Au/PEDOT/Pt micromotors. Chemisorption of an Iodine isotope onto the micromotor's Au surface rendered them detectable by PET and we could track their movements in tubular phantom over time frames of up to 15 minutes...
January 23, 2018: ACS Nano
https://www.readbyqxmd.com/read/29326994/single-coating-of-zinc-ferrite-renders-magnetic-nanomotors-therapeutic-and-stable-against-agglomeration
#6
Pooyath Lekshmy Venugopalan, Shilpee Jain, Srinivasrao Shivashankar, Ambarish Ghosh
Magnetic nanomotors with integrated theranostic capabilities can revolutionize biomedicine of the future. Typically, these nanomotors contain ferromagnetic materials, such that small magnetic fields can be used to maneuver and localize them in fluidic or gel-like environments. Motors with large permanent magnetic moments tend to agglomerate, which limits the scalability of this otherwise promising technology. Here, we demonstrate the application of a microwave-synthesized ferrite layer to reduce the agglomeration of helical ferromagnetic nanomotors by an order of magnitude, which allows them to be stored in a colloidal suspension for longer than six months and subsequently be manoeuvred with undiminished performance...
January 12, 2018: Nanoscale
https://www.readbyqxmd.com/read/29325201/active-intracellular-delivery-of-a-cas9-sgrna-complex-using-ultrasound-propelled-nanomotors
#7
Malthe Hansen-Bruhn, Berta Esteban-Fernández de Ávila, Mara Beltrán-Gastélum, Jing Zhao, Doris E Ramírez-Herrera, Pavimol Angsantikul, Kurt Vesterager Gothelf, Liangfang Zhang, Joseph Wang
Direct and rapid intracellular delivery of a functional Cas9/sgRNA complex using ultrasound-powered nanomotors is reported. The Cas9/sgRNA complex is loaded onto the nanomotor surface through a reversible disulfide linkage. A 5 min ultrasound treatment enables the Cas9/sgRNA-loaded nanomotors to directly penetrate through the plasma membrane of GFP-expressing B16F10 cells. The Cas9/sgRNA is released inside the cells to achieve highly effective GFP gene knockout. The acoustic Cas9/sgRNA-loaded nanomotors display more than 80 % GFP knockout within 2 h of cell incubation compared to 30 % knockout using static nanowires...
January 11, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29303550/electric-field-guided-precision-manipulation-of-catalytic-nanomotors-for-cargo-delivery-and-powering-nanoelectromechanical-devices
#8
Jianhe Guo, Jeremie June Gallegos, Ashley Robyn Tom, Donglei Fan
We report a controllable and precision approach in manipulating catalytic nanomotors by strategically applied electric (E-) fields in three dimensions (3-D). With the high controllability, the catalytic nanomotors have demonstrated versatility in capturing, delivering, and releasing of cargos to designated locations as well as in-situ integration with nanomechanical devices (NEMS) to chemically power the actuation. With combined AC and DC E-fields, catalytic nanomotors can be accurately aligned by the AC E-fields and effectively change their speeds instantly by the DC E-fields...
January 5, 2018: ACS Nano
https://www.readbyqxmd.com/read/29280612/light-guided-nanomotor-systems-for-autonomous-photothermal-cancer-therapy
#9
Hyunsik Choi, Geon-Hui Lee, Ki Su Kim, Sei Kwang Hahn
Machines have greatly contributed to the human civilization, enabling tasks beyond our capacities for improved quality of life. Recently, the progress in nanotechnology has triggered to build a miniaturized machine of nano-scale. In this context, synthetic nanomotors have gained considerable interest because of their great promise for diverse applications. Currently, the movement control of these nanomotors has been widely investigated using various stimuli. Here,we demonstrate near-infrared (NIR) light controlled on/off motion of stomatocyte nanomotors powered by the conversion of hydrogen peroxide...
December 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29221377/communication-mechanochemical-fluctuation-theorem-and-thermodynamics-of-self-phoretic-motors
#10
Pierre Gaspard, Raymond Kapral
Microscopic dynamical aspects of the propulsion of nanomotors by self-phoretic mechanisms are considered. Propulsion by self-diffusiophoresis relies on the mechanochemical coupling between the fluid velocity field and the concentration fields induced by asymmetric catalytic reactions on the motor surface. The consistency between the thermodynamics of this coupling and the microscopic reversibility of the underlying molecular dynamics is investigated. For this purpose, a mechanochemical fluctuation theorem for the joint probability to find the motor at position r after n reactive events have occurred during the time interval t is derived, starting from coupled Langevin equations for the translational, rotational, and chemical fluctuations of self-phoretic motors...
December 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29193346/biomimetic-platelet-camouflaged-nanorobots-for-binding-and-isolation-of-biological-threats
#11
Jinxing Li, Pavimol Angsantikul, Wenjuan Liu, Berta Esteban-Fernández de Ávila, Xiaocong Chang, Elodie Sandraz, Yuyan Liang, Siyu Zhu, Yue Zhang, Chuanrui Chen, Weiwei Gao, Liangfang Zhang, Joseph Wang
One emerging and exciting topic in robotics research is the design of micro-/nanoscale robots for biomedical operations. Unlike industrial robots that are developed primarily to automate routine and dangerous tasks, biomedical nanorobots are designed for complex, physiologically relevant environments, and tasks that involve unanticipated biological events. Here, a biologically interfaced nanorobot is reported, made of magnetic helical nanomotors cloaked with the plasma membrane of human platelets. The resulting biomimetic nanorobots possess a biological membrane coating consisting of diverse functional proteins associated with human platelets...
November 28, 2017: Advanced Materials
https://www.readbyqxmd.com/read/29143413/bioinspired-chemical-communication-between-synthetic-nanomotors
#12
Chuanrui Chen, Xiaocong Chang, Hazhir Teymourian, Doris E Ramírez Herrera, Berta Esteban Fernández de Ávila, Xiaolong Lu, Jinxing Li, Sha He, Chengcheng Fang, Yuyan Liang, Fangzhi Mou, Jianguo Guan, Joseph Wang
While chemical communication plays a key role in diverse natural processes, the intelligent chemical communication between synthetic nanomotors remains unexplored. Here we demonstrate the design and operation of bio-inspired synthetic nanomotors capable of chemical communication among themselves that influences their propulsion behavior. The chemical message is sent from a moving 'activator' motor to a nearby 'activated' (receiver) one, and involves release of silver ions from a Janus PS/Ni/Au/Ag 'activator' motor to the 'activated' Janus SiO2/Pt nanomotor...
November 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/29058727/emergent-dynamic-chirality-in-a-thermally-driven-artificial-spin-ratchet
#13
Sebastian Gliga, Gino Hrkac, Claire Donnelly, Jonathan Büchi, Armin Kleibert, Jizhai Cui, Alan Farhan, Eugenie Kirk, Rajesh V Chopdekar, Yusuke Masaki, Nicholas S Bingham, Andreas Scholl, Robert L Stamps, Laura J Heyderman
Modern nanofabrication techniques have opened the possibility to create novel functional materials, whose properties transcend those of their constituent elements. In particular, tuning the magnetostatic interactions in geometrically frustrated arrangements of nanoelements called artificial spin ice can lead to specific collective behaviour, including emergent magnetic monopoles, charge screening and transport, as well as magnonic response. Here, we demonstrate a spin-ice-based active material in which energy is converted into unidirectional dynamics...
October 23, 2017: Nature Materials
https://www.readbyqxmd.com/read/29022882/friction-effect-of-stator-in-a-multi-walled-cnt-based-rotation-transmission-system
#14
Xiao-Ni Zhang, Kun Cai, Jiao Shi, Qing-Hua Qin
The rotation transmission system made from co-axial multi-walled nanotubes (MWNT) has a function of regulating the input rotation from a nanomotor. The mechanism for the regulation is that the friction among the tubes during rotation governs the rotation of the rotors in the nanosystem. Integrating a rotary nanomotor and a nanobearing into a MWNT-based rotation transmission system, it is discovered that the stator (outer tube) provides relative greater friction on the rotors by penetrating the motor tube which has a higher stable rotational frequency...
October 12, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28983536/visible-light-driven-magnetically-steerable-gold-iron-oxide-nanomotors
#15
Dekai Zhou, Liqiang Ren, Yuguang C Li, Pengtao Xu, Yuan Gao, Guangyu Zhang, Wei Wang, Thomas E Mallouk, Longqiu Li
We report the synthesis and properties of rod-shaped gold/iron oxide nanomotors that are powered by visible light in dilute hydrogen peroxide solutions. Electrochemical measurements confirmed that the light-driven nanomotors operate by a self-electrophoretic mechanism, modulated by the photovoltage and the photoconductivity of gold/iron oxide. Due to the magnetism of iron oxide, the nanomotors can be steered by an external magnetic field without incorporating additional magnetic materials into the nanomotors...
October 6, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28983387/growth-and-detachment-of-oxygen-bubbles-induced-by-gold-catalyzed-decomposition-of-hydrogen-peroxide
#16
Pengyu Lv, Hai Le The, Jan Eijkel, Albert Van den Berg, Xuehua Zhang, Detlef Lohse
Whereas bubble growth out of gas-oversatured solutions has been quite well understood, including the formation and stability of surface nanobubbles, this is not the case for bubbles forming on catalytic surfaces due to catalytic reactions, though it has important implications for gas evolution reactions and self-propulsion of micro/nanomotors fueled by bubble release. In this work we have filled this gap by experimentally and theoretically examining the growth and detachment dynamics of oxygen bubbles from hydrogen peroxide decomposition catalyzed by gold...
September 28, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28967007/zno-based-microrockets-with-light-enhanced-propulsion
#17
Renfeng Dong, Chun Wang, Qinglong Wang, Allen Pei, Xueling She, Yuxian Zhang, Yuepeng Cai
Improving the propulsion of artificial micro-nanomotors represents an exciting nanotechnology challenge, especially considering their cargo delivery ability and fuel efficiency. In light of the excellent photocatalytic performance of zinc oxide (ZnO) and chemical catalytic properties of platinum (Pt), ZnO-Pt microrockets with light-enhanced propulsion have been developed by atomic layer deposition (ALD) technology. The velocity of such microrockets is dramatically doubled upon irradiation by 77 mW cm(-2) ultraviolet (UV) light in 10% H2O2 and is almost 3 times higher than the classic poly(3,4-ethylenedioxythiophene)-Pt microrockets (PEDOT-Pt microrockets) even in 6% H2O2 under the same UV light...
October 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28949354/light-driven-micro-nanomotors-from-fundamentals-to-applications
#18
REVIEW
Leilei Xu, Fangzhi Mou, Haotian Gong, Ming Luo, Jianguo Guan
Light, as an external stimulus, is capable of driving the motion of micro/nanomotors (MNMs) with the advantages of reversible, wireless and remote manoeuvre on demand with excellent spatial and temporal resolution. This review focuses on the state-of-the-art light-driven MNMs, which are able to move in liquids or on a substrate surface by converting light energy into mechanical work. The general design strategies for constructing asymmetric fields around light-driven MNMs to propel themselves are introduced as well as the photoactive materials for light-driven MNMs, including photocatalytic materials, photothermal materials and photochromic materials...
November 13, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28948246/the-fountain-effect-of-ice-like-water-across-nanotubes-at-room-temperature
#19
Kuiwen Zhao, Huiying Wu
The well-known fountain effect of superfluid helium can directly convert heat to mechanical work by the transport of the superfluid across narrow channels under a temperature difference. But it is regarded as a unique feature of superfluids, only occurring below the temperature of 2.17 K. Here we report a peculiar fountain effect of ice-like water across nanotubes at room temperature. Based on molecular simulations, we observed fascinating ultrafast fountain flow across nanotubes from the cold side to the hot side under a small temperature difference, due to the near-dissipationless nature of ice-like ordered water inside the nanotubes...
November 1, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28930338/biomedical-nanomotors-efficient-glucose-mediated-insulin-release
#20
Paula Díez, Berta Esteban-Fernández de Ávila, Doris E Ramírez-Herrera, Reynaldo Villalonga, Joseph Wang
We report herein the design of an autonomous glucose-responsive smart nanomachine for insulin (In) delivery based on ultrasound (US)-propelled nanomotors combined with an enzyme-based sensing-effector unit. Gold nanowire (AuNW) motors have been coupled with a mesoporous silica (MS) segment, which was gated with pH-responsive phenylboronic acid (PBA)-glucose oxidase (GOx) supramolecular nanovalves responsible for the insulin release. Glucose-induced protonation of the PBA groups triggers the opening of the pH-driven gate and uncapping of the insulin-loaded nanovalves...
October 5, 2017: Nanoscale
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