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He T, Yang Y, Chen XB. Propulsion mechanisms of micro/nanorobots: a review. NANOSCALE 2024; 16:12696-12734. [PMID: 38940742 DOI: 10.1039/d4nr01776e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/29/2024]
Abstract
Micro/nanomotors (MNMs) are intelligent, efficient and promising micro/nanorobots (MNR) that can respond to external stimuli (e.g., chemical energy, temperature, light, pH, ultrasound, magnetic, biosignals, ions) and perform specific tasks. The MNR can adapt to different external stimuli and transform into various functional forms to match different application scenarios. So far, MNR have found extensive application in targeted therapy, drug delivery, tissue engineering, environmental remediation, and other fields. Despite the promise of MNR, there are few reviews that focus on them. To shed new light on the further development of the field, it is necessary to provide an overview of the current state of development of these MNR. Therefore, this paper reviews the research progress of MNR in terms of propulsion mechanisms, and points out the pros and cons of different stimulus types. Finally, this paper highlights the current challenges faced by MNR and proposes possible solutions to facilitate the practical application of MNR.
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Affiliation(s)
- Tao He
- School of Electronic and Information Engineering, University of Science and Technology Liaoning, Anshan 114051, China.
| | - Yonghui Yang
- School of Electronic and Information Engineering, University of Science and Technology Liaoning, Anshan 114051, China.
| | - Xue-Bo Chen
- School of Electronic and Information Engineering, University of Science and Technology Liaoning, Anshan 114051, China.
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2
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Wang Q, Yang S, Zhang L. Untethered Micro/Nanorobots for Remote Sensing: Toward Intelligent Platform. NANO-MICRO LETTERS 2023; 16:40. [PMID: 38032461 PMCID: PMC10689342 DOI: 10.1007/s40820-023-01261-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 10/25/2023] [Indexed: 12/01/2023]
Abstract
Untethered micro/nanorobots that can wirelessly control their motion and deformation state have gained enormous interest in remote sensing applications due to their unique motion characteristics in various media and diverse functionalities. Researchers are developing micro/nanorobots as innovative tools to improve sensing performance and miniaturize sensing systems, enabling in situ detection of substances that traditional sensing methods struggle to achieve. Over the past decade of development, significant research progress has been made in designing sensing strategies based on micro/nanorobots, employing various coordinated control and sensing approaches. This review summarizes the latest developments on micro/nanorobots for remote sensing applications by utilizing the self-generated signals of the robots, robot behavior, microrobotic manipulation, and robot-environment interactions. Providing recent studies and relevant applications in remote sensing, we also discuss the challenges and future perspectives facing micro/nanorobots-based intelligent sensing platforms to achieve sensing in complex environments, translating lab research achievements into widespread real applications.
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Affiliation(s)
- Qianqian Wang
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing, 211189, People's Republic of China.
| | - Shihao Yang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077, People's Republic of China
| | - Li Zhang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077, People's Republic of China.
- Chow Yuk Ho Technology Centre for Innovative Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077, People's Republic of China.
- T Stone Robotics Institute, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077, People's Republic of China.
- Department of Surgery, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077, People's Republic of China.
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3
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Shivalkar S, Roy A, Chaudhary S, Samanta SK, Chowdhary P, Sahoo AK. Strategies in design of self-propelling hybrid micro/nanobots for bioengineering applications. Biomed Mater 2023; 18:062003. [PMID: 37703889 DOI: 10.1088/1748-605x/acf975] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 09/13/2023] [Indexed: 09/15/2023]
Abstract
Micro/nanobots are integrated devices developed from engineered nanomaterials that have evolved significantly over the past decades. They can potentially be pre-programmed to operate robustly at numerous hard-to-reach organ/tissues/cellular sites for multiple bioengineering applications such as early disease diagnosis, precision surgeries, targeted drug delivery, cancer therapeutics, bio-imaging, biomolecules isolation, detoxification, bio-sensing, and clearing up clogged arteries with high soaring effectiveness and minimal exhaustion of power. Several techniques have been introduced in recent years to develop programmable, biocompatible, and energy-efficient micro/nanobots. Therefore, the primary focus of most of these techniques is to develop hybrid micro/nanobots that are an optimized combination of purely synthetic or biodegradable bots suitable for the execution of user-defined tasks more precisely and efficiently. Recent progress has been illustrated here as an overview of a few of the achievable construction principles to be used to make biomedical micro/nanobots and explores the pivotal ventures of nanotechnology-moderated development of catalytic autonomous bots. Furthermore, it is also foregrounding their advancement offering an insight into the recent trends and subsequent prospects, opportunities, and challenges involved in the accomplishments of the effective multifarious bioengineering applications.
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Affiliation(s)
- Saurabh Shivalkar
- Department of Applied Sciences, Indian Institute of Information Technology, Allahabad, UP, India
| | - Anwesha Roy
- Department of Biotechnology, Heritage Institute of Technology, Kolkata, West Bengal, India
| | - Shrutika Chaudhary
- Department of Biotechnology, Delhi Technological University, Delhi, India
| | - Sintu Kumar Samanta
- Department of Applied Sciences, Indian Institute of Information Technology, Allahabad, UP, India
| | - Pallabi Chowdhary
- Department of Biotechnology, M.S. Ramaiah University of Applied Sciences, Bengaluru, Karnataka, India
| | - Amaresh Kumar Sahoo
- Department of Applied Sciences, Indian Institute of Information Technology, Allahabad, UP, India
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Khandelwal A, Li X. Strain-induced self-rolled-up microtubes for multifunctional on-chip microfluidic applications. BIOMICROFLUIDICS 2023; 17:051501. [PMID: 37720301 PMCID: PMC10505069 DOI: 10.1063/5.0170958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2023] [Accepted: 09/04/2023] [Indexed: 09/19/2023]
Abstract
On-chip microfluidics are characterized as miniaturized devices that can be either integrated with other components on-chip or can individually serve as a standalone lab-on-a-chip system for a variety of applications ranging from biochemical sensing to macromolecular manipulation. Heterogenous integration with various materials and form factors is, therefore, key to enhancing the performance of such microfluidic systems. The fabrication of complex three-dimensional (3D) microfluidic components that can be easily integrated with other material systems and existing state-of-the-art microfluidics is of rising importance. Research on producing self-assembled 3D architectures by the emerging self-rolled-up membrane (S-RuM) technology may hold the key to such integration. S-RuM technology relies on a strain-induced deformation mechanism to spontaneously transform stacked thin-film materials into 3D cylindrical hollow structures virtually on any kind of substrate. Besides serving as a compact microfluidic chamber, the S-RuM-based on-chip microtubular architecture exhibits several other advantages for microfluidic applications including customizable geometry, biocompatibility, chemical stability, ease of integration, uniform field distributions, and increased surface area to volume ratio. In this Review, we will highlight some of the applications related to molecule/particle sensing, particle delivery, and manipulation that utilized S-RuM technology to their advantage.
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Affiliation(s)
- Apratim Khandelwal
- Department of Electrical and Computer Engineering, Nick Holonyak Micro and Nanotechnology Laboratory, University of Illinois, Urbana, Illinois 61801, USA
| | - Xiuling Li
- Author to whom correspondence should be addressed:
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Cai L, Xu D, Zhang Z, Li N, Zhao Y. Tailoring Functional Micromotors for Sensing. RESEARCH 2023; 6:0044. [PMID: 37040517 PMCID: PMC10078326 DOI: 10.34133/research.0044] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 12/20/2022] [Indexed: 02/05/2023]
Abstract
Micromotors are identified as a promising candidate in the field of sensing benefiting from their capacity of autonomous movement. Here, a review on the development of tailoring micromotors for sensing is presented, covering from their propulsion mechanisms and sensing strategies to applications. First, we concisely summarize the propulsion mechanism of micromotors involving fuel-based propulsion and fuel-free propulsion introducing their principles. Then, emphasis is laid to the sensing stratagems of the micromotors including speed-based sensing strategy, fluorescence-based sensing strategy, and other strategies. We listed typical examples of different sensing stratagems. After that, we introduce the applications of micromotors in sensing fields including environmental science, food safety, and biomedical fields. Finally, we discuss the challenges and prospects of the micromotors tailored for sensing. We believe that this comprehensive review can help readers to catch the research frontiers in the field of sensing and thus to burst out new ideas.
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Affiliation(s)
- Lijun Cai
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Dongyu Xu
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Zeyou Zhang
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Ning Li
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Yuanjin Zhao
- Department of Rheumatology and Immunology, Nanjing Drum Tower Hospital, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
- Oujiang Laboratory (Zhejiang Lab for Regenerative Medicine, Vision and Brain Health), Wenzhou Institute,University of Chinese Academy of Sciences, Wenzhou, Zhejiang 325001, China
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Liu T, Xie L, Price CAH, Liu J, He Q, Kong B. Controlled propulsion of micro/nanomotors: operational mechanisms, motion manipulation and potential biomedical applications. Chem Soc Rev 2022; 51:10083-10119. [PMID: 36416191 DOI: 10.1039/d2cs00432a] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Inspired by natural mobile microorganisms, researchers have developed micro/nanomotors (MNMs) that can autonomously move by transducing different kinds of energies into kinetic energy. The rapid development of MNMs has created tremendous opportunities for biomedical fields including diagnostics, therapeutics, and theranostics. Although the great progress has been made in MNM research, at a fundamental level, the accepted propulsion mechanisms are still a controversial matter. In practical applications such as precision nanomedicine, the precise control of the motion, including the speed and directionality, of MNMs is also important, which makes advanced motion manipulation desirable. Very recently, diverse MNMs with different propulsion strategies, morphologies, sizes, porosities and chemical structures have been fabricated and applied for various uses. Herein, we thoroughly summarize the physical principles behind propulsion strategies, as well as the recent advances in motion manipulation methods and relevant biomedical applications of these MNMs. The current challenges in MNM research are also discussed. We hope this review can provide a bird's eye overview of the MNM research and inspire researchers to create novel and more powerful MNMs.
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Affiliation(s)
- Tianyi Liu
- Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200438, China. .,DICP-Surrey Joint Centre for Future Materials, Department of Chemical and Process Engineering, University of Surrey, Guildford, Surrey GU2 7XH, UK.
| | - Lei Xie
- Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200438, China.
| | - Cameron-Alexander Hurd Price
- DICP-Surrey Joint Centre for Future Materials, Department of Chemical and Process Engineering, University of Surrey, Guildford, Surrey GU2 7XH, UK.
| | - Jian Liu
- DICP-Surrey Joint Centre for Future Materials, Department of Chemical and Process Engineering, University of Surrey, Guildford, Surrey GU2 7XH, UK. .,State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China.,College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, Inner Mongolia, 010021, PR China
| | - Qiang He
- Key Laboratory of Microsystems and Microstructures Manufacturing (Ministry of Education), Harbin Institute of Technology, Harbin, China.
| | - Biao Kong
- Department of Chemistry, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University, Shanghai 200438, China. .,Yiwu Research Institute of Fudan University, Yiwu, Zhejiang 322000, China
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Activity-induced interactions and cooperation of artificial microswimmers in one-dimensional environments. Nat Commun 2022; 13:1772. [PMID: 35365633 PMCID: PMC8976030 DOI: 10.1038/s41467-022-29430-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Accepted: 03/14/2022] [Indexed: 12/14/2022] Open
Abstract
Cooperative motion in biological microswimmers is crucial for their survival as it facilitates adhesion to surfaces, formation of hierarchical colonies, efficient motion, and enhanced access to nutrients. Here, we confine synthetic, catalytic microswimmers along one-dimensional paths and demonstrate that they too show a variety of cooperative behaviours. We find that their speed increases with the number of swimmers, and that the activity induces a preferred distance between swimmers. Using a minimal model, we ascribe this behavior to an effective activity-induced potential that stems from a competition between chemical and hydrodynamic coupling. These interactions further induce active self-assembly into trains where swimmers move at a well-separated, stable distance with respect to each other, as well as compact chains that can elongate, break-up, become immobilized and remobilized. We identify the crucial role that environment morphology and swimmer directionality play on these highly dynamic chain behaviors. These activity-induced interactions open the door toward exploiting cooperation for increasing the efficiency of microswimmer motion, with temporal and spatial control, thereby enabling them to perform intricate tasks inside complex environments. Biological microswimmers such as bacteria show collective motion that is made possible by an intricate interplay of sensing and signaling. Ketzetzi et al. reproduce this phenomenon in a catalytic system undergoing, for instance, cooperative speed-ups and dynamic reconfiguration of microswimmer chains.
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Chakraborty R, Maiti A, Sharma N, Dey KK. Active matter dynamics in confined microfluidic environments. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2022; 186:245-265. [PMID: 35033287 DOI: 10.1016/bs.pmbts.2021.07.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The field of active matter is a nascent area of research in soft condensed matter physics, which is drawing on the expertise of researchers from diverse disciplines. Small scale active particles-both inorganic and biological-display non-trivial emergent dynamics and interactions that could help us understand complex biological processes and phenomena. Recently, using microfluidic technologies, several research groups have performed important experimental and theoretical studies to understand the behavior of self-propelled particles and molecular active matter within confined environments-to glean a fundamental understanding of the cellular processes occurring under ultra-low Reynolds number conditions. In this chapter, we would like to review applications of microfluidics in active matter research, highlighting a few important theoretical and experimental investigations. We will conclude the discussion with a note on the future of this field mentioning a few open questions that are at the forefront of our minds.
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Affiliation(s)
- Rik Chakraborty
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, India
| | - Arnab Maiti
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, India
| | - Nikita Sharma
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, India
| | - Krishna Kanti Dey
- Discipline of Physics, Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, India.
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Lauersdorf N, Kolb T, Moradi M, Nazockdast E, Klotsa D. Phase behavior and surface tension of soft active Brownian particles. SOFT MATTER 2021; 17:6337-6351. [PMID: 34128024 DOI: 10.1039/d1sm00350j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We study quasi two-dimensional, monodisperse systems of active Brownian particles (ABPs) for a range of activities, stiffnesses, and densities. We develop a microscopic, analytical method for predicting the dense phase structure formed after motility-induced phase separation (MIPS) has occurred, including the dense cluster's area fraction, interparticle pressure, and radius. Our predictions are in good agreement with our Brownian dynamics simulations. We, then, derive a continuum model to investigate the relationship between the predicted interparticle pressure, the swim pressure, and the macroscopic pressure in the momentum equation. We find that formulating the point-wise macroscopic pressure as the interparticle pressure and modeling the particle activity through a spatially variant body force - as opposed to a volume-averaged swim pressure - results in consistent predictions of pressure in both the continuum model and the microscopic theory. This formulation of pressure also results in nearly zero surface tension for the phase separated domains, irrespective of activity, stiffness, and area fraction. Furthermore, using Brownian dynamics simulations and our continuum model, we showed that both the interface width and surface tension, are intrinsic characteristics of the system. On the other hand, if we were to exclude the body force induced by activity, we find that the resulting surface tension values are linearly dependent on the size of the simulation, in contrast to the statistical mechanical definition of surface tension.
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Affiliation(s)
- Nicholas Lauersdorf
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, USA.
| | - Thomas Kolb
- Department of Chemistry, University of North Carolina at Chapel Hill, USA
| | - Moslem Moradi
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, USA.
| | - Ehssan Nazockdast
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, USA.
| | - Daphne Klotsa
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, USA.
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Sharan P, Nsamela A, Lesher-Pérez SC, Simmchen J. Microfluidics for Microswimmers: Engineering Novel Swimmers and Constructing Swimming Lanes on the Microscale, a Tutorial Review. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2007403. [PMID: 33949106 DOI: 10.1002/smll.202007403] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 01/29/2021] [Indexed: 05/16/2023]
Abstract
This paper provides an updated review of recent advances in microfluidics applied to artificial and biohybrid microswimmers. Sharing the common regime of low Reynolds number, the two fields have been brought together to take advantage of the fluid characteristics at the microscale, benefitting microswimmer research multifold. First, microfluidics offer simple and relatively low-cost devices for high-fidelity production of microswimmers made of organic and inorganic materials in a variety of shapes and sizes. Microscale confinement and the corresponding fluid properties have demonstrated differential microswimmer behaviors in microchannels or in the presence of various types of physical or chemical stimuli. Custom environments to study these behaviors have been designed in large part with the help of microfluidics. Evaluating microswimmers in increasingly complex lab environments such as microfluidic systems can ensure more effective implementation for in-field applications. The benefits of microfluidics for the fabrication and evaluation of microswimmers are balanced by the potential use of microswimmers for sample manipulation and processing in microfluidic systems, a large obstacle in diagnostic and other testing platforms. In this review various ways in which these two complementary technology fields will enhance microswimmer development and implementation in various fields are introduced.
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Affiliation(s)
- Priyanka Sharan
- Chair of Physical Chemistry, TU Dresden, 01062, Dresden, Germany
| | | | | | - Juliane Simmchen
- Chair of Physical Chemistry, TU Dresden, 01062, Dresden, Germany
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Fu D, Wang Z, Tu Y, Peng F. Interactions between Biomedical Micro-/Nano-Motors and the Immune Molecules, Immune Cells, and the Immune System: Challenges and Opportunities. Adv Healthc Mater 2021; 10:e2001788. [PMID: 33506650 DOI: 10.1002/adhm.202001788] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 12/21/2020] [Indexed: 12/16/2022]
Abstract
Mobile micro- and nano-motors (MNMs) emerge as revolutionary platforms for biomedical applications, including drug delivery, biosensing, non-invasive surgery, and cancer therapy. While for applications in biomedical fields and practical clinical translation, the interactions of these untethered tiny machines with the immune system is an essential issue to be considered. This review highlights the recent approaches of surpassing immune barriers to prevent foreign motors from triggering immune responses. In addition to trials focusing on the function preservation of MNMs, examples of versatile MNMs working with the immune components (immune molecules, immune cells and the whole system) to achieve cancer immunotherapy, immunoassay, and detoxification are outlined. The immune interference part provides researchers an idea about what is the limit presented by the immune components. The coworking part suggests ways to bypass or even utilize the limit. With interdisciplinary cooperation of nanoengineering, materials science, and immunology field, the rationally designed functional MNMs are expected to provide novel opportunities for the biomedical field.
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Affiliation(s)
- Dongmei Fu
- School of Materials Science and Engineering Sun‐Yat‐sen University Guangzhou 510275 China
| | - Zhen Wang
- School of Materials Science and Engineering Sun‐Yat‐sen University Guangzhou 510275 China
| | - Yingfeng Tu
- School of Pharmaceutical Science Southern Medical University Guangzhou 510515 China
| | - Fei Peng
- School of Materials Science and Engineering Sun‐Yat‐sen University Guangzhou 510275 China
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Díez P, Lucena-Sánchez E, Escudero A, Llopis-Lorente A, Villalonga R, Martínez-Máñez R. Ultrafast Directional Janus Pt-Mesoporous Silica Nanomotors for Smart Drug Delivery. ACS NANO 2021; 15:4467-4480. [PMID: 33677957 PMCID: PMC8719758 DOI: 10.1021/acsnano.0c08404] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Development of bioinspired nanomachines with an efficient propulsion and cargo-towing has attracted much attention in the last years due to their potential biosensing, diagnostics, and therapeutics applications. In this context, self-propelled synthetic nanomotors are promising carriers for intelligent and controlled release of therapeutic payloads. However, the implementation of this technology in real biomedical applications is still facing several challenges. Herein, we report the design, synthesis, and characterization of innovative multifunctional gated platinum-mesoporous silica nanomotors constituted of a propelling element (platinum nanodendrite face), a drug-loaded nanocontainer (mesoporous silica nanoparticle face), and a disulfide-containing oligo(ethylene glycol) chain (S-S-PEG) as a gating system. These Janus-type nanomotors present an ultrafast self-propelled motion due to the catalytic decomposition of low concentrations of hydrogen peroxide. Likewise, nanomotors exhibit a directional movement, which drives the engines toward biological targets, THP-1 cancer cells, as demonstrated using a microchip device that mimics penetration from capillary to postcapillary vessels. This fast and directional displacement facilitates the rapid cellular internalization and the on-demand specific release of a cytotoxic drug into the cytosol, due to the reduction of the disulfide bonds of the capping ensemble by intracellular glutathione levels. In the microchip device and in the absence of fuel, nanomotors are neither able to move directionally nor reach cancer cells and deliver their cargo, revealing that the fuel is required to get into inaccessible areas and to enhance nanoparticle internalization and drug release. Our proposed nanosystem shows many of the suitable characteristics for ideal biomedical destined nanomotors, such as rapid autonomous motion, versatility, and stimuli-responsive controlled drug release.
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Affiliation(s)
- Paula Díez
- Instituto
Interuniversitario de Investigacio′n de Reconocimiento Molecular
y Desarrollo Tecnolo′gico (IDM), Universitat Politècnica
de València, Universitat de València,
Spain, Camino de Vera s/n, 46022 València, Spain
- Unidad
Mixta UPV-CIPF de Investigacio′n en Mecanismos de Enfermedades
y Nanomedicina, Valencia, Universitat Politècnica
de València, Centro
de Investigacio′n Príncipe Felipe, 46012 València, Spain
- CIBER
de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Elena Lucena-Sánchez
- Instituto
Interuniversitario de Investigacio′n de Reconocimiento Molecular
y Desarrollo Tecnolo′gico (IDM), Universitat Politècnica
de València, Universitat de València,
Spain, Camino de Vera s/n, 46022 València, Spain
- Unidad
Mixta UPV-CIPF de Investigacio′n en Mecanismos de Enfermedades
y Nanomedicina, Valencia, Universitat Politècnica
de València, Centro
de Investigacio′n Príncipe Felipe, 46012 València, Spain
- CIBER
de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Andrea Escudero
- Instituto
Interuniversitario de Investigacio′n de Reconocimiento Molecular
y Desarrollo Tecnolo′gico (IDM), Universitat Politècnica
de València, Universitat de València,
Spain, Camino de Vera s/n, 46022 València, Spain
- Unidad
Mixta UPV-CIPF de Investigacio′n en Mecanismos de Enfermedades
y Nanomedicina, Valencia, Universitat Politècnica
de València, Centro
de Investigacio′n Príncipe Felipe, 46012 València, Spain
- CIBER
de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Antoni Llopis-Lorente
- Instituto
Interuniversitario de Investigacio′n de Reconocimiento Molecular
y Desarrollo Tecnolo′gico (IDM), Universitat Politècnica
de València, Universitat de València,
Spain, Camino de Vera s/n, 46022 València, Spain
- Unidad
Mixta UPV-CIPF de Investigacio′n en Mecanismos de Enfermedades
y Nanomedicina, Valencia, Universitat Politècnica
de València, Centro
de Investigacio′n Príncipe Felipe, 46012 València, Spain
- CIBER
de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
| | - Reynaldo Villalonga
- Nanosensors
& Nanomachines Group, Department of Analytical Chemistry, Faculty
of Chemistry, Complutense University of
Madrid, 28040 Madrid, Spain
| | - Ramón Martínez-Máñez
- Instituto
Interuniversitario de Investigacio′n de Reconocimiento Molecular
y Desarrollo Tecnolo′gico (IDM), Universitat Politècnica
de València, Universitat de València,
Spain, Camino de Vera s/n, 46022 València, Spain
- Unidad
Mixta UPV-CIPF de Investigacio′n en Mecanismos de Enfermedades
y Nanomedicina, Valencia, Universitat Politècnica
de València, Centro
de Investigacio′n Príncipe Felipe, 46012 València, Spain
- Unidad
Mixta de Investigación en Nanomedicina y Sensores, Universitat Politècnica de València,
Instituto de Investigación Sanitaria La Fe, 46026 València, Spain
- CIBER
de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), 28029 Madrid, Spain
- E-mail:
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Soto F, Wang J, Ahmed R, Demirci U. Medical Micro/Nanorobots in Precision Medicine. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2020; 7:2002203. [PMID: 33173743 PMCID: PMC7610261 DOI: 10.1002/advs.202002203] [Citation(s) in RCA: 120] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 08/09/2020] [Indexed: 05/15/2023]
Abstract
Advances in medical robots promise to improve modern medicine and the quality of life. Miniaturization of these robotic platforms has led to numerous applications that leverages precision medicine. In this review, the current trends of medical micro and nanorobotics for therapy, surgery, diagnosis, and medical imaging are discussed. The use of micro and nanorobots in precision medicine still faces technical, regulatory, and market challenges for their widespread use in clinical settings. Nevertheless, recent translations from proof of concept to in vivo studies demonstrate their potential toward precision medicine.
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Affiliation(s)
- Fernando Soto
- Bio‐Acoustic MEMS in Medicine (BAMM) LaboratoryCanary Center at Stanford for Cancer Early DetectionDepartment of RadiologySchool of Medicine Stanford UniversityPalo AltoCA94304‐5427USA
- Canary Center at Stanford for Cancer Early DetectionDepartment of RadiologySchool of MedicineStanford UniversityPalo AltoCA94304‐5427USA
| | - Jie Wang
- Bio‐Acoustic MEMS in Medicine (BAMM) LaboratoryCanary Center at Stanford for Cancer Early DetectionDepartment of RadiologySchool of Medicine Stanford UniversityPalo AltoCA94304‐5427USA
- Canary Center at Stanford for Cancer Early DetectionDepartment of RadiologySchool of MedicineStanford UniversityPalo AltoCA94304‐5427USA
| | - Rajib Ahmed
- Bio‐Acoustic MEMS in Medicine (BAMM) LaboratoryCanary Center at Stanford for Cancer Early DetectionDepartment of RadiologySchool of Medicine Stanford UniversityPalo AltoCA94304‐5427USA
- Canary Center at Stanford for Cancer Early DetectionDepartment of RadiologySchool of MedicineStanford UniversityPalo AltoCA94304‐5427USA
| | - Utkan Demirci
- Bio‐Acoustic MEMS in Medicine (BAMM) LaboratoryCanary Center at Stanford for Cancer Early DetectionDepartment of RadiologySchool of Medicine Stanford UniversityPalo AltoCA94304‐5427USA
- Canary Center at Stanford for Cancer Early DetectionDepartment of RadiologySchool of MedicineStanford UniversityPalo AltoCA94304‐5427USA
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14
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Saad S, Kaur H, Natale G. Scalable Chemical Synthesis Route to Manufacture pH-Responsive Janus CaCO 3 Micromotors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:12590-12600. [PMID: 33054231 DOI: 10.1021/acs.langmuir.0c02148] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A cost-effective scalable chemical route to produce pH-responsive active colloids (ACs) is developed here. For the first time, calcium carbonate particles are half-coated with a silica layer via Pickering emulsion methodology. This methodology allows to create anisotropy on the particles' surfaces and benefit from the decomposition of the calcium carbonate in acidic media to generate self-propulsion. The coupling between the self-diffusiophoretic motion of these ACs and acid concentrations is experimentally investigated in Newtonian media via optical microscopy. With increasing hydrogen-ion concentrations, the pH-responsive colloids experience higher mean-square displacements because of self-propulsion velocities and enhanced long-time diffusivities. Because they are biocompatible and environmentally friendly, these ACs constitute a platform for advanced diagnostics, targeted drug delivery, and water/soil remediation.
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Affiliation(s)
- Shabab Saad
- Department of Chemical & Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Harsovin Kaur
- Department of Chemical & Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Giovanniantonio Natale
- Department of Chemical & Petroleum Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
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15
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Biofriendly micro/nanomotors operating on biocatalysis: from natural to biological environments. BIOPHYSICS REPORTS 2020. [DOI: 10.1007/s41048-020-00119-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Abstract
Micro/nanomotors (MNMs) are tiny motorized objects that can autonomously navigate in complex fluidic environments under the influence of an appropriate source of energy. Internal energy-driven MNMs are composed of certain reactive materials that are capable of converting chemical energy from the surroundings into kinetic energy. Recent advances in smart nanomaterials design and processing have endowed the internal energy-driven MNMs with different geometrical designs and various mechanisms of locomotion, with remarkable traveling speed in diverse environments ranging from environmental water to complex body fluids. Among the different design principals, MNM systems that operate from biocatalysis possess biofriendly components, efficient energy conversion, and mild working condition, exhibiting a potential of stepping out of the proof-of-concept phase for addressing many real-life environmental and biotechnological challenges. The biofriendliness of MNMs should not only be considered for in vivo drug delivery but also for environmental remediation and chemical sensing that only environmentally friendly intermediates and degraded products are generated. This review aims to provide an overview of the recent advances in biofriendly MNM design using biocatalysis as the predominant driving force, towards practical applications in biotechnology and environmental technology.
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16
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Khezri B, Novotný F, Moo JGS, Nasir MZM, Pumera M. Confined Bubble-Propelled Microswimmers in Capillaries: Wall Effect, Fuel Deprivation, and Exhaust Product Excess. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2000413. [PMID: 32133771 DOI: 10.1002/smll.202000413] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Indexed: 06/10/2023]
Abstract
Self-propelled autonomous nano/microswimmers are at the forefront of materials science. These swimmers are expected to operate in highly confined environments, such as between the grains of soil or in the capillaries of the human organism. To date, little attention is paid to the problem that in such a confined environment the fuel powering catalytic nano/microswimmers can be exhausted quickly and the space can be polluted with the product of the catalytic reaction. In addition, the motion of the nano/microswimmers may be influenced by the confinement. These issues are addressed here, showing the influence of the size of the capillary and length of the micromotor on the motion and the influence of the depletion of the fuel and excess of the exhaust products. Theoretical modeling is provided as well to bring further insight into the observations. This article shows challenges that these systems face and stimulates research to overcome them.
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Affiliation(s)
- Bahareh Khezri
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Prague, 166 28, Czech Republic
| | - Filip Novotný
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Prague, 166 28, Czech Republic
| | - James Guo Sheng Moo
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Muhammad Zafir Mohamad Nasir
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore
| | - Martin Pumera
- Center for Advanced Functional Nanorobots, Department of Inorganic Chemistry, University of Chemistry and Technology Prague, Technická 5, Prague, 166 28, Czech Republic
- Department of Chemical and Biomolecular Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul, 03722, South Korea
- Future Energy and Innovation Laboratory, Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, Brno, CZ-616 00, Czech Republic
- Department of Medical Research, China Medical University Hospital, China Medical University, No. 91 Hsueh-Shih Road, Taichung, 40402, Taiwan
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17
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Chen Q, Liu FW, Xiao Z, Sharma N, Cho SK, Kim K. Ultrasound Tracking of the Acoustically Actuated Microswimmer. IEEE Trans Biomed Eng 2019; 66:3231-3237. [DOI: 10.1109/tbme.2019.2902523] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Srivastava SK, Ajalloueian F, Boisen A. Thread-Like Radical-Polymerization via Autonomously Propelled (TRAP) Bots. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1901573. [PMID: 31165526 DOI: 10.1002/adma.201901573] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2019] [Revised: 05/09/2019] [Indexed: 05/12/2023]
Abstract
Micromotor-mediated synthesis of thread-like hydrogel microstructures in an aqueous environment is presented. The study utilizes a catalytic micromotor assembly (owing to the presence of a Pt layer), with an on-board chemical reservoir (i.e., polymerization mixture), toward thread-like radical-polymerization via autonomously propelled bots (i.e., TRAP bots). Synergistic coupling of catalytically active Pt layer, together with radical initiators (H2 O2 and FeCl3 (III)), and PEGDA monomers preloaded into the TRAP bot, results in the polymerization of monomeric units into elongated thread-like hydrogel polymers coupled with self-propulsion. Interestingly, polymer generation via TRAP bots can also be triggered in the absence of hydrogen peroxide for cellular/biomedical application. The resulting polymeric hydrogel microstructures are able to entrap living cells (NIH 3T3 fibroblast cells), and are easily separable via a centrifugation or magnetic separation (owing to the presence of a Ni layer). The cellular biocompatibility of TRAP bots is established via a LIVE/DEAD assay and MTS cell proliferation assay (7 days observation). This is the first study demonstrating real-time in situ hydrogel polymerization via an artificial microswimmer, capable of enmeshing biotic/abiotic microobjects in its reaction environment, and lays a strong foundation for advanced applications in cell/tissue engineering, drug delivery, and cleaner technologies.
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Affiliation(s)
- Sarvesh Kumar Srivastava
- Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Healthcare Technology, Technical University of Denmark, 2800, Lyngby, Denmark
| | - Fatemeh Ajalloueian
- Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Healthcare Technology, Technical University of Denmark, 2800, Lyngby, Denmark
| | - Anja Boisen
- Center for Intelligent Drug Delivery and Sensing Using Microcontainers and Nanomechanics (IDUN), Department of Healthcare Technology, Technical University of Denmark, 2800, Lyngby, Denmark
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19
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Peng F, Tu Y, Wilson DA. Micro/nanomotors towards in vivo application: cell, tissue and biofluid. Chem Soc Rev 2018; 46:5289-5310. [PMID: 28524919 DOI: 10.1039/c6cs00885b] [Citation(s) in RCA: 196] [Impact Index Per Article: 32.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Inspired by highly efficient natural motors, synthetic micro/nanomotors are self-propelled machines capable of converting the supplied fuel into mechanical motion. A significant advance has been made in the construction of diverse motors over the last decade. These synthetic motor systems, with rapid transporting and efficient cargo towing abilities, are expected to open up new horizons for various applications. Utilizing emergent motor platforms for in vivo applications is one important aspect receiving growing interest as conventional therapeutic methodology still remains limited for cancer, heart, or vasculature diseases. In this review we will highlight the recent efforts towards realistic in vivo application of various motor systems. With ever booming research enthusiasm in this field and increasing multidisciplinary cooperation, micro/nanomotors with integrated multifunctionality and selectivity are on their way to revolutionize clinical practice.
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Affiliation(s)
- Fei Peng
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
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20
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Zizzari A, Bianco M, del Mercato L, Carraro M, Bonchio M, Frigione M, Montagna F, Gigli G, Viola I, Arima V. Self-powered catalytic microfluidic platforms for fluid delivery. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.05.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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21
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Maria-Hormigos R, Jurado-Sánchez B, Escarpa A. Tailored magnetic carbon allotrope catalytic micromotors for 'on-chip' operations. NANOSCALE 2017; 9:6286-6290. [PMID: 28475185 DOI: 10.1039/c6nr09750b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Carbon allotrope micromotors are proposed as active components in lab-on-a-chip systems. Highly rough carbon black tubular engines are used for fluorescence detection operations. The potential of ultrafast lectin carbon nanonotube micromotors with an inner anti-biofouling layer for selective transport of sugar modified particles (as cell mimics) in human plasma is illustrated.
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Affiliation(s)
- R Maria-Hormigos
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcala, Alcala de Henares E-28871, Madrid, Spain.
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22
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Soleymani L, Li F. Mechanistic Challenges and Advantages of Biosensor Miniaturization into the Nanoscale. ACS Sens 2017; 2:458-467. [PMID: 28723192 DOI: 10.1021/acssensors.7b00069] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Over the past few decades, there has been tremendous interest in developing biosensing systems that combine high sensitivity and specificity with rapid sample-to-answer times, portability, low-cost operation, and ease-of-use. Miniaturizing the biosensor dimensions into the nanoscale has been identified as a strategy for addressing the functional requirements of point-of-care and wearable biosensors. However, it is important to consider that decreasing the critical dimensions of biosensing elements impacts the two most important performance metrics of biosensors: limit-of-detection and response time. Miniaturization into the nanoscale enhances signal-to-noise-ratio by increasing the signal density (signal/geometric surface area) and reducing background signals. However, there is a trade-off between the enhanced signal transduction efficiency and the longer time it takes to collect target analytes on sensor surfaces due to the increase in mass transport times. By carefully considering the signal transduction mechanisms and reaction-transport kinetics governing different classes of biosensors, it is possible to develop structure-level and device-level strategies for leveraging miniaturization toward creating biosensors that combine low limit-of-detection with rapid response times.
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Affiliation(s)
- Leyla Soleymani
- Department
of Engineering Physics, School of Biomedical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4L8, Canada
| | - Feng Li
- Department
of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St. Catharines, Ontario L2S 3A1, Canada
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23
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Minh TD, Safdar M, Jänis J. Protection of Platinum-Based Micromotors from Thiol Toxicity by Using Manganese Oxide. Chemistry 2017; 23:8134-8136. [DOI: 10.1002/chem.201700788] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Tam Do Minh
- Department of Chemistry; University of Eastern Finland; P.O. Box 111 80101 Joensuu Finland
| | - Muhammad Safdar
- Department of Chemistry; University of Eastern Finland; P.O. Box 111 80101 Joensuu Finland
| | - Janne Jänis
- Department of Chemistry; University of Eastern Finland; P.O. Box 111 80101 Joensuu Finland
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24
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Li J, Esteban-Fernández de Ávila B, Gao W, Zhang L, Wang J. Micro/Nanorobots for Biomedicine: Delivery, Surgery, Sensing, and Detoxification. Sci Robot 2017; 2:eaam6431. [PMID: 31552379 PMCID: PMC6759331 DOI: 10.1126/scirobotics.aam6431] [Citation(s) in RCA: 630] [Impact Index Per Article: 90.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Micro- and nanoscale robots that can effectively convert diverse energy sources into movement and force represent a rapidly emerging and fascinating robotics research area. Recent advances in the design, fabrication, and operation of micro/nanorobots have greatly enhanced their power, function, and versatility. The new capabilities of these tiny untethered machines indicate immense potential for a variety of biomedical applications. This article reviews recent progress and future perspectives of micro/nanorobots in biomedicine, with a special focus on their potential advantages and applications for directed drug delivery, precision surgery, medical diagnosis and detoxification. Future success of this technology, to be realized through close collaboration between robotics, medical and nanotechnology experts, should have a major impact on disease diagnosis, treatment, and prevention.
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Affiliation(s)
- Jinxing Li
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| | | | - Wei Gao
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Liangfang Zhang
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Joseph Wang
- Department of NanoEngineering, University of California, San Diego, La Jolla, CA 92093, USA
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25
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Xu T, Gao W, Xu LP, Zhang X, Wang S. Fuel-Free Synthetic Micro-/Nanomachines. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2017; 29:1603250. [PMID: 28026067 DOI: 10.1002/adma.201603250] [Citation(s) in RCA: 221] [Impact Index Per Article: 31.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 09/16/2016] [Indexed: 05/24/2023]
Abstract
Inspired by the swimming of natural microorganisms, synthetic micro-/nanomachines, which convert energy into movement, are able to mimic the function of these amazing natural systems and help humanity by completing environmental and biological tasks. While offering autonomous propulsion, conventional micro-/nanomachines usually rely on the decomposition of external chemical fuels (e.g., H2 O2 ), which greatly hinders their applications in biologically relevant media. Recent developments have resulted in various micro-/nanomotors that can be powered by biocompatible fuels. Fuel-free synthetic micro-/nanomotors, which can move without external chemical fuels, represent another attractive solution for practical applications owing to their biocompatibility and sustainability. Here, recent developments on fuel-free micro-/nanomotors (powered by various external stimuli such as light, magnetic, electric, or ultrasonic fields) are summarized, ranging from fabrication to propulsion mechanisms. The applications of these fuel-free micro-/nanomotors are also discussed, including nanopatterning, targeted drug/gene delivery, cell manipulation, and precision nanosurgery. With continuous innovation, future autonomous, intelligent and multifunctional fuel-free micro-/nanomachines are expected to have a profound impact upon diverse biomedical applications, providing unlimited opportunities beyond one's imagination.
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Affiliation(s)
- Tailin Xu
- Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing, Beijing, 100083, P. R. China
| | - Wei Gao
- Electrical Engineering and Computer Sciences, University of California, Berkeley, CA, 94720, USA
| | - Li-Ping Xu
- Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing, Beijing, 100083, P. R. China
| | - Xueji Zhang
- Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing, Beijing, 100083, P. R. China
| | - Shutao Wang
- Key Laboratory of Bio-inspired Materials and Interface Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
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26
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Jurado-Sánchez B, Escarpa A. Milli, micro and nanomotors: Novel analytical tools for real-world applications. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2016.03.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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27
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Ma X, Hortelao AC, Miguel-López A, Sánchez S. Bubble-Free Propulsion of Ultrasmall Tubular Nanojets Powered by Biocatalytic Reactions. J Am Chem Soc 2016; 138:13782-13785. [PMID: 27718566 PMCID: PMC5228068 DOI: 10.1021/jacs.6b06857] [Citation(s) in RCA: 111] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
![]()
The motion of self-propelled
tubular micro- and nanojets
has so far been achieved by bubble propulsion, e.g., O2 bubbles formed by catalytic decomposition of H2O2, which renders future biomedical applications inviable.
An alternative self-propulsion mechanism for tubular engines on the
nanometer scale is still missing. Here, we report the fabrication
and characterization of bubble-free propelled tubular nanojets
(as small as 220 nm diameter), powered by an enzyme-triggered biocatalytic
reaction using urea as fuel. We studied the translational and rotational
dynamics of the nanojets as functions of the length and location
of the enzymes. Introducing tracer nanoparticles into the system,
we demonstrated the presence of an internal flow that extends into
the external fluid via the cavity opening, leading to the self-propulsion.
One-dimensional nanosize, longitudinal self-propulsion, and
biocompatibility make the tubular nanojets promising for
future biomedical applications.
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Affiliation(s)
- Xing Ma
- Max-Planck Institute for Intelligent Systems Institution , Heisenbergstraße 3, 70569 Stuttgart, Germany.,School of Materials Science and Engineering, Harbin Institute of Technology Shenzhen Graduate School , 518055 Shenzhen, China
| | - Ana C Hortelao
- Max-Planck Institute for Intelligent Systems Institution , Heisenbergstraße 3, 70569 Stuttgart, Germany.,Institut de Bioenginyeria de Catalunya (IBEC) , Baldiri i Reixac 10-12, 08028 Barcelona, Spain
| | - Albert Miguel-López
- Institut de Bioenginyeria de Catalunya (IBEC) , Baldiri i Reixac 10-12, 08028 Barcelona, Spain
| | - Samuel Sánchez
- Max-Planck Institute for Intelligent Systems Institution , Heisenbergstraße 3, 70569 Stuttgart, Germany.,Institut de Bioenginyeria de Catalunya (IBEC) , Baldiri i Reixac 10-12, 08028 Barcelona, Spain.,Institució Catalana de Recerca i Estudis Avancats (ICREA) , Pg. Lluís Companys 23, 08010 Barcelona, Spain
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28
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Kherzi B, Pumera M. Self-propelled autonomous nanomotors meet microfluidics. NANOSCALE 2016; 8:17415-17421. [PMID: 27714185 DOI: 10.1039/c6nr06665h] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Self-propelled autonomous nano/micromotors are in the forefront of current materials science and technology research. These small machines convert chemical energy from the environment into propulsion, and they can move autonomously in the environment and are capable of chemotaxis or magnetotaxis. They can be used for drug delivery, microsurgeries or environmental remediation. It is of immense interest from a future biomedical application point of view to understand the motion of the nano/micromotors in microfluidic channels. In this minireview, we review the progress on the use of nano/micromotors in microfluidic channels and lab-on-chip devices.
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Affiliation(s)
- Bahareh Kherzi
- Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.
| | - Martin Pumera
- Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore.
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29
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Maria-Hormigos R, Jurado-Sánchez B, Escarpa A. Labs-on-a-chip meet self-propelled micromotors. LAB ON A CHIP 2016; 16:2397-2407. [PMID: 27250248 DOI: 10.1039/c6lc00467a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This frontier review covers recent advances in the field of nanomaterial-based micromotors for the development of novel labs-on-a-chip (LOCs). In this review, we will discuss how carbon nanomaterials "on-board" of micromotors offer particular promise for diverse LOC applications. New trends in the field, directed towards the use of quantum dots and nanoparticles as functional materials for sophisticated micromotors, will be reviewed. Micromotor strategies using functionalized catalytic microengines to capture and transport (bio)molecules between the different reservoirs of LOC devices will also be covered. These recent advances are bringing closer our hopes for personalized medicine and food safety assurance, among others.
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Affiliation(s)
- R Maria-Hormigos
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, University of Alcala, Alcala de Henares E-28871, Madrid, Spain.
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30
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Campbell A, Archer R, Ebbens S. Preparation and 3D Tracking of Catalytic Swimming Devices. J Vis Exp 2016. [PMID: 27404327 PMCID: PMC4993318 DOI: 10.3791/54247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
We report a method to prepare catalytically active Janus colloids that "swim" in fluids and describe how to determine their 3D motion using fluorescence microscopy. One commonly deployed method for catalytically active colloids to produce enhanced motion is via an asymmetrical distribution of catalyst. Here this is achieved by spin coating a dispersed layer of fluorescent polymeric colloids onto a flat planar substrate, and then using directional platinum vapor deposition to half coat the exposed colloid surface, making a two faced "Janus" structure. The Janus colloids are then re-suspended from the planar substrate into an aqueous solution containing hydrogen peroxide. Hydrogen peroxide serves as a fuel for the platinum catalyst, which is decomposed into water and oxygen, but only on one side of the colloid. The asymmetry results in gradients that produce enhanced motion, or "swimming". A fluorescence microscope, together with a video camera is used to record the motion of individual colloids. The center of the fluorescent emission is found using image analysis to provide an x and y coordinate for each frame of the video. While keeping the microscope focal position fixed, the fluorescence emission from the colloid produces a characteristic concentric ring pattern which is subject to image analysis to determine the particles relative z position. In this way 3D trajectories for the swimming colloid are obtained, allowing swimming velocity to be accurately measured, and physical phenomena such as gravitaxis, which may bias the colloids motion to be detected.
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Affiliation(s)
- Andrew Campbell
- Department of Chemical and Biological Engineering, University of Sheffield
| | - Richard Archer
- Department of Chemical and Biological Engineering, University of Sheffield
| | - Stephen Ebbens
- Department of Chemical and Biological Engineering, University of Sheffield;
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31
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Abstract
Autonomous propulsion at the nanoscale represents one of the most challenging and demanding goals in nanotechnology. Over the past decade, numerous important advances in nanotechnology and material science have contributed to the creation of powerful self-propelled micro/nanomotors. In particular, micro- and nanoscale rockets (MNRs) offer impressive capabilities, including remarkable speeds, large cargo-towing forces, precise motion controls, and dynamic self-assembly, which have paved the way for designing multifunctional and intelligent nanoscale machines. These multipurpose nanoscale shuttles can propel and function in complex real-life media, actively transporting and releasing therapeutic payloads and remediation agents for diverse biomedical and environmental applications. This review discusses the challenges of designing efficient MNRs and presents an overview of their propulsion behavior, fabrication methods, potential rocket fuels, navigation strategies, practical applications, and the future prospects of rocket science and technology at the nanoscale.
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Affiliation(s)
- Jinxing Li
- Department of Nanoengineering, University of California San Diego , La Jolla, California 92093, United States
| | - Isaac Rozen
- Department of Nanoengineering, University of California San Diego , La Jolla, California 92093, United States
| | - Joseph Wang
- Department of Nanoengineering, University of California San Diego , La Jolla, California 92093, United States
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Feng J, Yuan J, Cho SK. 2-D steering and propelling of acoustic bubble-powered microswimmers. LAB ON A CHIP 2016; 16:2317-2325. [PMID: 27229753 DOI: 10.1039/c6lc00431h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This paper describes bi-directional (linear and rotational) propelling and 2-D steering of acoustic bubble-powered microswimmers that are achieved in a centimeter-scale pool (beyond chip level scale). The core structure of a microswimmer is a microtube with one end open in which a gaseous bubble is trapped. The swimmer is propelled by microstreaming flows that are generated when the trapped bubble is oscillated by an external acoustic wave. The bubble oscillation and thus propelling force are highly dependent on the frequency of the acoustic wave and the bubble length. This dependence is experimentally studied by measuring the resonance behaviors of the testing pool and bubble using a laser Doppler vibrometer (LDV) and by evaluating the generated streaming flows. The key idea in the present 2-D steering is to utilize this dependence. Multiple bubbles with different lengths are mounted on a single microswimmer with a variety of arrangements. By controlling the frequency of the acoustic wave, only frequency-matched bubbles can strongly oscillate and generate strong propulsion. By arranging multiple bubbles of different lengths in parallel but with their openings opposite and switching the frequency of the acoustic wave, bi-directionally linear propelling motions are successfully achieved. The propelling forces are calculated by a CFD analysis using the Ansys Fluent® package. For bi-directional rotations, a similar method but with diagonal arrangement of bubbles on a rectangular swimmer is also applied. The rotation can be easily reversed when the frequency of the acoustic wave is switched. For 2-D steering, short bubbles are aligned perpendicular to long bubbles. It is successfully demonstrated that the microswimmer navigates through a T-junction channel under full control with and without carrying a payload. During the navigation, the frequency is the main control input to select and resonate targeted bubbles. All of these operations are achieved by a single piezoelectric actuator.
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Affiliation(s)
- Jian Feng
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA.
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Active colloids: Progress and challenges towards realising autonomous applications. Curr Opin Colloid Interface Sci 2016. [DOI: 10.1016/j.cocis.2015.10.003] [Citation(s) in RCA: 131] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Khezri B, Sheng Moo JG, Song P, Fisher AC, Pumera M. Detecting the complex motion of self-propelled micromotors in microchannels by electrochemistry. RSC Adv 2016. [DOI: 10.1039/c6ra22059b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Self-propelled micromotors were detected via impact electrochemistry technique in real time which allows the different modes of micromotor motions under channel environments to be recognized.
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Affiliation(s)
- Bahareh Khezri
- Division of Chemistry & Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - James Guo Sheng Moo
- Division of Chemistry & Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Peng Song
- Department of Chemical Engineering and Biotechnology
- University of Cambridge
- Cambridge CB2 3RA
- UK
| | - Adrian C. Fisher
- Department of Chemical Engineering and Biotechnology
- University of Cambridge
- Cambridge CB2 3RA
- UK
| | - Martin Pumera
- Division of Chemistry & Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
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Abstract
Nature supports multifaceted forms of life. Despite the variety and complexity of these forms, motility remains the epicenter of life. The applicable laws of physics change upon going from macroscales to microscales and nanoscales, which are characterized by low Reynolds number (Re). We discuss motion at low Re in natural and synthetic systems, along with various propulsion mechanisms, including electrophoresis, electrolyte diffusiophoresis, and nonelectrolyte diffusiophoresis. We also describe the newly uncovered phenomena of motility in non-ATP-driven self-powered enzymes and the directional movement of these enzymes in response to substrate gradients. These enzymes can also be immobilized to function as fluid pumps in response to the presence of their substrates. Finally, we review emergent collective behavior arising from interacting motile species, and we discuss the possible biomedical applications of the synthetic nanobots and microbots.
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Affiliation(s)
| | | | - Peter J. Butler
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802;,
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Dynamic Magnetic Responsive Wall Array with Droplet Shedding-off Properties. Sci Rep 2015; 5:11209. [PMID: 26061176 PMCID: PMC4462108 DOI: 10.1038/srep11209] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 05/19/2015] [Indexed: 11/25/2022] Open
Abstract
Directional control of droplets on a surface is an important issue for tasks of long-range liquid-transport, self-cleaning and water repellency. However, it is still challenging to control the structure motions in orientations so as to control the shedding-off of droplets. Herein, we report a novel dynamic magnetic responsive wall (DMRW) array on PDMS (polydimethylsiloxane) -based surface. The walls can easily tilt through the effect of the external magnet because of the magnetic material in the DMRW. The droplets can be shed off directionally on the surface. Particularly, with the shape recovery and flexible properties, it achieves simultaneous control of the tilt angles (0-60°) of DMRW for shedding-off of droplets with different volumes (1-15 μL) under magnetic action on DMRW. The mechanism of droplet shedding-off on DMRW is elucidated by theory of interfaces. It offers an insight into design of dynamic interface for water repellency. This strategy realizes the preparation of multifunctional, tunable and directional drive functions.
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Wang J. Self-propelled affinity biosensors: Moving the receptor around the sample. Biosens Bioelectron 2015; 76:234-42. [PMID: 26074332 DOI: 10.1016/j.bios.2015.04.095] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 04/25/2015] [Accepted: 04/27/2015] [Indexed: 12/31/2022]
Abstract
Self-propelled nanomotors offer considerable promise for developing novel biosensing protocols involving 'on-the-fly' recognition events. This article reviews recent advances in using catalytic nanomotors for bioaffinity sensing and for isolating target biomolecules and cells from complex biological samples. A variety of receptors, attached to self-propelled nanoscale motors, can thus move around the sample and, along with the generated microbubbles, lead to greatly enhanced fluid transport and accelerated recognition process. Such operation addresses the challenges imposed by the slow analyte transport in designing sensitive bioaffinity assays. The recognition element can be attached onto the motor surface or embedded in the motor material itself. Receptor-functionalized nanomotors based on different biomolecular interactions have thus been shown extremely useful for rapid target isolation from complex biological samples without preparatory and washing steps. Tubular microengine microtransporters, functionalized with antibody, ss-DNA, aptamer or lectin receptors, are particularly useful for direct detection and isolation of proteins, nucleic acids, proteins or cancer cells. Micromotors with 'built-in' recognition, exploiting the selective binding properties of the outer layer of such micronegines, can also be used. Greatly enhanced analyte-receptor interactions can also be achieved through the increased fluid transport associated with the movement of unmodified micromotors. The attractive features of the new motion-based bioaffinity sensing and separation protocols open up new opportunities for diverse biomedical, environmental and security applications.
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Affiliation(s)
- J Wang
- Department of Nanoengineering, University of California San Diego, San Diego, CA 92903, USA.
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de Graaf J, Rempfer G, Holm C. Diffusiophoretic Self-Propulsion for Partially Catalytic Spherical Colloids. IEEE Trans Nanobioscience 2015; 14:272-88. [DOI: 10.1109/tnb.2015.2403255] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Feng J, Yuan J, Cho SK. Micropropulsion by an acoustic bubble for navigating microfluidic spaces. LAB ON A CHIP 2015; 15:1554-1562. [PMID: 25650274 DOI: 10.1039/c4lc01266f] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This paper describes an underwater micropropulsion principle where a gaseous bubble trapped in a suspended microchannel and oscillated by external acoustic excitation generates a propelling force. The propelling swimmer is designed and microfabricated from parylene on the microscale (the equivalent diameter of the cylindrical bubble is around 60 μm) using microphotolithography. The propulsion mechanism is studied and verified by computational fluid dynamics (CFD) simulations as well as experiments. The acoustically excited and thus periodically oscillating bubble generates alternating flows of intake and discharge through an opening of the microchannel. As the Reynolds number of oscillating flow increases, the difference between the intake and discharge flows becomes significant enough to generate a net flow (microstreaming flow) and a propulsion force against the channel. As the size of the device is reduced, however, the Reynolds number is also reduced. To maintain the Reynolds number in a certain range and thus generate a strong propulsion force in the fabricated device, the oscillation amplitude of the bubble is maximized (resonated) and the oscillation frequency is set high (over 10 kHz). Propelling motions by a single bubble as well as an array of bubbles are achieved on the microscale. In addition, the microswimmer demonstrates payload carrying. This propulsion mechanism may be applied to microswimmers that navigate microfluidic environments and possibly narrow passages in human bodies to perform biosensing, drug delivery, imaging, and microsurgery.
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Affiliation(s)
- Jian Feng
- Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA.
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Orozco J, Pan G, Sattayasamitsathit S, Galarnyk M, Wang J. Micromotors to capture and destroy anthrax simulant spores. Analyst 2015; 140:1421-7. [PMID: 25622851 DOI: 10.1039/c4an02169j] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Towards addressing the need for detecting and eliminating biothreats, we describe a micromotor-based approach for screening, capturing, isolating and destroying anthrax simulant spores in a simple and rapid manner with minimal sample processing. The B. globilli antibody-functionalized micromotors can recognize, capture and transport B. globigii spores in environmental matrices, while showing non-interactions with excess of non-target bacteria. Efficient destruction of the anthrax simulant spores is demonstrated via the micromotor-induced mixing of a mild oxidizing solution. The new micromotor-based approach paves a way to dynamic multifunctional systems that rapidly recognize, isolate, capture and destroy biological threats.
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Affiliation(s)
- Jahir Orozco
- Department of Nanoengineering, University of California, San Diego, La Jolla, California 92093, USA.
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Xiao Q, Li J, Han J, Xu KX, Huang ZX, Hu J, Sun JJ. The role of hydrazine in mixed fuels (H2O2/N2H4) for Au–Fe/Ni nanomotors. RSC Adv 2015. [DOI: 10.1039/c5ra08263c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hydrazine in mixed fuels facilitates the oxidation of H2O2 to oxygen bubbles that propel the Au–Fe/Ni nanomotors.
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Affiliation(s)
- Qing Xiao
- Institute of Drug Research
- Fujian Academy of Traditional Chinese Medicine
- Fuzhou
- China
| | - Ju Li
- Ministry of Education Key Laboratory of Analysis and Determination for Food Safety
- Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety
- College of Chemistry
- Fuzhou University
- Fuzhou
| | - Jing Han
- Institute of Drug Research
- Fujian Academy of Traditional Chinese Medicine
- Fuzhou
- China
| | - Kai-Xuan Xu
- Ministry of Education Key Laboratory of Analysis and Determination for Food Safety
- Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety
- College of Chemistry
- Fuzhou University
- Fuzhou
| | - Zong-Xiong Huang
- Ministry of Education Key Laboratory of Analysis and Determination for Food Safety
- Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety
- College of Chemistry
- Fuzhou University
- Fuzhou
| | - Juan Hu
- Institute of Drug Research
- Fujian Academy of Traditional Chinese Medicine
- Fuzhou
- China
- College of Pharmacy
| | - Jian-Jun Sun
- Ministry of Education Key Laboratory of Analysis and Determination for Food Safety
- Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety
- College of Chemistry
- Fuzhou University
- Fuzhou
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Jurado-Sánchez B, Escarpa A, Wang J. Lighting up micromotors with quantum dots for smart chemical sensing. Chem Commun (Camb) 2015; 51:14088-91. [DOI: 10.1039/c5cc04726a] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A novel “on-the-fly” chemical detection strategy based on coupling of the optical properties of QDs and the autonomous movement of micromachines is described.
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Affiliation(s)
| | - A. Escarpa
- Department of Analytical Chemistry
- Physical Chemistry and Chemical Engineering
- University of Alcala
- Alcala de Henares E-28871
- Madrid
| | - J. Wang
- Department of NanoEngineering
- University of California
- La Jolla
- USA
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Sánchez S, Soler L, Katuri J. Chemically powered micro- and nanomotors. Angew Chem Int Ed Engl 2014; 54:1414-44. [PMID: 25504117 DOI: 10.1002/anie.201406096] [Citation(s) in RCA: 586] [Impact Index Per Article: 58.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Indexed: 11/08/2022]
Abstract
Chemically powered micro- and nanomotors are small devices that are self-propelled by catalytic reactions in fluids. Taking inspiration from biomotors, scientists are aiming to find the best architecture for self-propulsion, understand the mechanisms of motion, and develop accurate control over the motion. Remotely guided nanomotors can transport cargo to desired targets, drill into biomaterials, sense their environment, mix or pump fluids, and clean polluted water. This Review summarizes the major advances in the growing field of catalytic nanomotors, which started ten years ago.
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Affiliation(s)
- Samuel Sánchez
- Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, 70569 Stuttgart (Germany) http://www.is.mpg.de/sanchez; Institute for Bioengineering of Catalonia (IBEC), 08028 Barcelona (Spain); Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona (Spain).
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