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Leidens LM, Michels AF, Machado G, Alvarez F, Smirnov AI, Krim J, Figueroa CA. Illuminating Pathways to Dynamic Nanotribology: Light-Mediated Active Control of Interfacial Friction with Nanosuspensions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2404268. [PMID: 39011945 DOI: 10.1002/smll.202404268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2024] [Revised: 06/27/2024] [Indexed: 07/17/2024]
Abstract
Active control of nanotribological properties is a challenge. Materials responsive to external stimuli may catalyze this paradigm shift. Recently, the nanofriction of a thin film is modulated by light, ushering in phototribology. This frontier is expanded here, by investigating photoactive nanoparticles in lubricants to confer similar functionality to passive surfaces. Quartz-crystal microbalance (QCM) is employed to assess the phototribological behavior of aqueous suspensions of titanium dioxide nanoparticles. A comparison of dark and illuminated conditions provides the first demonstration of tuning the interfacial friction in solid-nanosuspension interfaces by light. Cyclic tests reveal reversible transitions between higher (dark) and lower friction (illuminated) regimes. These transitions are underpinned by transient states with surface charge variations, as confirmed by Zeta potential measurements. The accumulated surface charge increases repulsion within the system and favors sliding. Upon cessation of illumination, the system returns to its prior equilibrium state. These findings impact not only nanotribology but nanofluidics and nanorheology. Furthermore, the results underscore the need to consider light-induced effects in other scenarios, including the calculation of activity coefficients of photoactive suspensions. This multifaceted study introduces a new dimension to in operando frictional tuning, beckoning a myriad of applications and fundamental insights at the nanoscale.
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Affiliation(s)
- Leonardo M Leidens
- PPGMAT, University of Caxias do Sul, Caxias do Sul, RS, 95070-560, Brazil
- Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Campinas, SP, 13083-970, Brazil
| | | | - Giovanna Machado
- Laboratory of Microscope and Microanalysis, Northeast Center for Strategic Technologies (CETENE), Recife, PE, 50740-545, Brazil
| | - Fernando Alvarez
- Instituto de Física "Gleb Wataghin", Universidade Estadual de Campinas, Campinas, SP, 13083-970, Brazil
| | - Alex I Smirnov
- Department of Chemistry, North Carolina State University, Raleigh, NC, 27695, USA
| | - Jacqueline Krim
- Department of Physics, North Carolina State University, Raleigh, NC, 27695, USA
| | - Carlos A Figueroa
- PPGMAT, University of Caxias do Sul, Caxias do Sul, RS, 95070-560, Brazil
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Matsuda Y, Hanasaki I, Iwao R, Yamaguchi H, Niimi T. Estimation of diffusive states from single-particle trajectory in heterogeneous medium using machine-learning methods. Phys Chem Chem Phys 2018; 20:24099-24108. [PMID: 30204178 DOI: 10.1039/c8cp02566e] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We propose a novel approach to analyze random walks in heterogeneous medium using a hybrid machine-learning method based on a gamma mixture and a hidden Markov model. A gamma mixture and a hidden Markov model respectively provide the number and the most probable sequence of diffusive states from the time series position data of particles/molecules obtained by single-particle/molecule tracking (SPT/SMT) method. We evaluate the performance of our proposed method for numerically generated trajectories. It is shown that our proposed method can correctly extract the number of diffusive states when each trajectory is long enough to be frame averaged. We also indicate that our method can provide an indicator whether the assumption of a medium consisting of discrete diffusive states is appropriate or not based on the available amount of trajectory data. Then, we demonstrate an application of our method to the analysis of experimentally obtained SPT data.
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Affiliation(s)
- Yu Matsuda
- Department of Modern Mechanical Engineering, Waseda University, 3-4-1 Ookubo, Shinjuku-ku, Tokyo 169-8555, Japan.
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Feizpour A, Stelter D, Wong C, Akiyama H, Gummuluru S, Keyes T, Reinhard BM. Membrane Fluidity Sensing on the Single Virus Particle Level with Plasmonic Nanoparticle Transducers. ACS Sens 2017; 2:1415-1423. [PMID: 28933537 DOI: 10.1021/acssensors.7b00226] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Viral membranes are nanomaterials whose fluidity depends on their composition, in particular, the cholesterol (chol) content. As differences in the membrane composition of individual virus particles can lead to different intracellular fates, biophysical tools capable of sensing the membrane fluidity on the single-virus level are required. In this manuscript, we demonstrate that fluctuations in the polarization of light scattered off gold or silver nanoparticle (NP)-labeled virus-like-particles (VLPs) encode information about the membrane fluidity of individual VLPs. We developed plasmonic polarization fluctuation tracking microscopy (PFTM) which facilitated the investigation of the effect of chol content on the membrane fluidity and its dependence on temperature, for the first time on the single-VLP level. Chol extraction studies with different methyl-β-cyclodextrin (MβCD) concentrations yielded a gradual decrease in polarization fluctuations as a function of time. The rate of chol extraction for individual VLPs showed a broad spread, presumably due to differences in the membrane composition for the individual VLPs, and this heterogeneity increased with decreasing MβCD concentration.
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Affiliation(s)
| | | | | | - Hisashi Akiyama
- Department
of Microbiology, Boston University School of Medicine, Boston, Massachusetts 02118, United States
| | - Suryaram Gummuluru
- Department
of Microbiology, Boston University School of Medicine, Boston, Massachusetts 02118, United States
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Lerch S, Reinhard BM. Spectral signatures of charge transfer in assemblies of molecularly-linked plasmonic nanoparticles. INTERNATIONAL JOURNAL OF MODERN PHYSICS. B 2017; 31:1740002. [PMID: 29391660 PMCID: PMC5788194 DOI: 10.1142/s0217979217400021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Self-assembly of functionalized nanoparticles (NPs) provides a unique class of nanomaterials for exploring and utilizing quantum-plasmonic effects that occur if the interparticle separation between NPs approaches a few nanometers and below. We review recent theoretical and experimental studies of plasmon coupling in self-assembled NP structures that contain molecular linkers between the NPs. Charge transfer through the interparticle gap of an NP dimer results in a significant blue-shift of the bonding dipolar plasmon (BDP) mode relative to classical electromagnetic predictions, and gives rise to new coupled plasmon modes, the so-called charge transfer plasmon (CTP) modes. The blue-shift of the plasmon spectrum is accompanied by a weakening of the electromagnetic field in the gap of the NPs. Due to an optical far-field signature that is sensitive to charge transfer across the gap, plasmonic molecules represent a sensor platform for detecting and characterizing gap conductivity in an optical fashion and for characterizing the role of molecules in facilitating the charge transfer across the gap.
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Affiliation(s)
- Sarah Lerch
- Department of Chemistry, Boston University, 8 Saint Mary's Street, Boston, MA 02215, USA. The Photonics Center, Boston University, 8 Saint Mary's Street, Boston, MA 02215, USA
| | - Björn M Reinhard
- Department of Chemistry, Boston University, 8 Saint Mary's Street, Boston, MA 02215, USA. The Photonics Center, Boston University, 8 Saint Mary's Street, Boston, MA 02215, USA
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Chen T, Wang X, Alizadeh MH, Reinhard BM. Monitoring transient nanoparticle interactions with liposome-confined plasmonic transducers. MICROSYSTEMS & NANOENGINEERING 2017; 3:16086. [PMID: 29862126 PMCID: PMC5983364 DOI: 10.1038/micronano.2016.86] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The encapsulation of individual pairs of plasmonic nanoparticles (NPs) in liposomes is introduced as a new strategy for utilizing plasmon coupling to monitor interactions between co-confined NPs in a nanoconfinement that ensures high local NP concentrations. We apply the approach to monitor transient binding contacts between noncovalently tethered 55 nm diameter gold NPs, which were functionalized with cytosine (C)-rich DNAs, in acidic and mildly basic buffer conditions. At pH = 8, a rich spectral dynamics indicates DNA-mediated transient binding and unbinding of co-confined NPs due to weak attractive interparticle interactions. A decrease in pH from 8 to 4 is observed to favor the associated state for some co-confined NPs, presumably due to a stabilization of the bound dimer configuration through noncanonical C-C+ bonds between the DNA-functionalized NPs. Plasmonic nanoemitters whose spectral response switches in response to chemical cues (in this work pH) represent optical transducers with a rich application space in chemical sensing, cell analysis and nanophotonics.
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Affiliation(s)
- Tianhong Chen
- Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - Xiao Wang
- Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - Mohammad Hossein Alizadeh
- Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - Björn M. Reinhard
- Department of Chemistry and The Photonics Center, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
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Walsh E, Feuerborn A, Cook PR. Formation of droplet interface bilayers in a Teflon tube. Sci Rep 2016; 6:34355. [PMID: 27681313 PMCID: PMC5041184 DOI: 10.1038/srep34355] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Accepted: 09/09/2016] [Indexed: 02/08/2023] Open
Abstract
Droplet-interface bilayers (DIBs) have applications in disciplines ranging from biology to computing. We present a method for forming them manually using a Teflon tube attached to a syringe pump; this method is simple enough it should be accessible to those without expertise in microfluidics. It exploits the properties of interfaces between three immiscible liquids, and uses fluid flow through the tube to pack together drops coated with lipid monolayers to create bilayers at points of contact. It is used to create functional nanopores in DIBs composed of phosphocholine using the protein α-hemolysin (αHL), to demonstrate osmotically-driven mass transfer of fluid across surfactant-based DIBs, and to create arrays of DIBs. The approach is scalable, and thousands of DIBs can be prepared using a robot in one hour; therefore, it is feasible to use it for high throughput applications.
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Affiliation(s)
- Edmond Walsh
- Osney Thermo-Fluids Laboratory, Department of Engineering Science, University of Oxford, Southwell Building, Osney Mead, Oxford OX2 0ES, UK
| | - Alexander Feuerborn
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
| | - Peter R Cook
- Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK
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Broda J, Setzler J, Leifert A, Steitz J, Benz R, Simon U, Wenzel W. Ligand-lipid and ligand-core affinity control the interaction of gold nanoparticles with artificial lipid bilayers and cell membranes. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2016; 12:1409-19. [DOI: 10.1016/j.nano.2015.12.384] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 12/28/2015] [Accepted: 12/28/2015] [Indexed: 12/14/2022]
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Chen T, Hong Y, Reinhard BM. Probing DNA Stiffness through Optical Fluctuation Analysis of Plasmon Rulers. NANO LETTERS 2015; 15:5349-57. [PMID: 26121062 PMCID: PMC4624404 DOI: 10.1021/acs.nanolett.5b01725] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The distance-dependent plasmon coupling between biopolymer tethered gold or silver nanoparticles forms the foundation for the so-called plasmon rulers. While conventional plasmon ruler applications focus on the detection of singular events in the far-field spectrum, we perform in this Letter a ratiometric analysis of the continuous spectral fluctuations arising from thermal interparticle separation variations in plasmon rulers confined to fluid lipid membranes. We characterized plasmon rulers with different DNA tethers and demonstrate the ability to detect and quantify differences in the plasmon ruler potential and tether stiffness. The influence of the nature of the tether (single-stranded versus double-stranded DNA) and the length of the tether is analyzed. The characterization of the continuous variation of the interparticle separation in individual plasmon rulers through optical fluctuation analysis provides additional information about the conformational flexibility of the tether molecule(s) located in the confinement of the deeply subdiffraction limit interparticle gap and enhances the versatility of plasmon rulers as a tool in Biophysics and Nanotechnology.
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Affiliation(s)
- Tianhong Chen
- Department of Chemistry and the Photonics Center, Boston University, Boston, MA 02215, United States
| | - Yan Hong
- Department of Chemistry and the Photonics Center, Boston University, Boston, MA 02215, United States
| | - Björn M. Reinhard
- Department of Chemistry and the Photonics Center, Boston University, Boston, MA 02215, United States
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Yu X, Xu F, Ramirez NGP, Kijewski SDG, Akiyama H, Gummuluru S, Reinhard BM. Dressing up Nanoparticles: A Membrane Wrap to Induce Formation of the Virological Synapse. ACS NANO 2015; 9:4182-92. [PMID: 25853367 PMCID: PMC4423798 DOI: 10.1021/acsnano.5b00415] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Next-generation nanoparticle-based drug delivery systems require the ability to target specific organelles or subcellular regions in selected target cells. Human immunodeficiency virus type I (HIV-1) particles are evolutionarily optimized nanocarriers that have evolved to avoid intracellular degradation and achieve enrichment at the synapse between mature dendritic cells (mDCs) and T cells by subverting cellular trafficking mechanisms. This study demonstrates that integration of the glycosphingolipid, GM3, in a membrane around a solid nanoparticle (NP) core is sufficient to recapitulate key aspects of the virus particle trafficking in mDCs. GM3-presenting artificial virus NPs (GM3-AVNs) accumulate in CD169(+) and CD81(+) nonlysosomal compartments in an actin-dependent process that mimics the sequestration of HIV-1. Live-cell optical tracking studies reveal a preferential recruitment and arrest of surface scanning CD4(+) T cells in direct vicinity to the AVN-enriched compartments. The formed mDC-T cell conjugates exhibit strong morphological similarities between the GM3-AVN-containing mDC-T cell synapse and the HIV-1 virological synapse, indicating that GM3-CD169 interactions alone are sufficient for establishing the mDC-T cell virological synapse. These results emphasize the potential of the GM3-AVN approach for providing therapeutic access to a key step of the host immune response--formation of the synaptic junction between an antigen-presenting cell (mDC) and T cells--for modulating and controlling immune responses.
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Affiliation(s)
- Xinwei Yu
- Department of Chemistry and The Photonics Center, Boston University, Boston, MA 02215, United States
| | - Fangda Xu
- Department of Chemistry and The Photonics Center, Boston University, Boston, MA 02215, United States
| | | | - Suzanne D. G. Kijewski
- Department of Microbiology, Boston University School of Medicine, Boston, MA 02118, United States
| | - Hisashi Akiyama
- Department of Microbiology, Boston University School of Medicine, Boston, MA 02118, United States
| | - Suryaram Gummuluru
- Department of Microbiology, Boston University School of Medicine, Boston, MA 02118, United States
| | - Björn M. Reinhard
- Department of Chemistry and The Photonics Center, Boston University, Boston, MA 02215, United States
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Lee YK, Kim S, Nam JM. Dark-field-based observation of single-nanoparticle dynamics on a supported lipid bilayer for in situ analysis of interacting molecules and nanoparticles. Chemphyschem 2014; 16:77-84. [PMID: 25345401 DOI: 10.1002/cphc.201402529] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Indexed: 11/11/2022]
Abstract
Observation of single plasmonic nanoparticles in reconstituted biological systems allows us to obtain snapshots of dynamic processes between molecules and nanoparticles with unprecedented spatiotemporal resolution and single-molecule/single-particle-level data acquisition. This Concept is intended to introduce nanoparticle-tethered supported lipid bilayer platforms that allow for the dynamic confinement of nanoparticles on a two-dimensional fluidic surface. The dark-field-based long-term, stable, real-time observation of freely diffusing plasmonic nanoparticles on a lipid bilayer enables one to extract a broad range of information about interparticle and molecular interactions throughout the entire reaction period. Herein, we highlight important developments in this context to provide ideas on how molecular interactions can be interpreted by monitoring dynamic behaviors and optical signals of laterally mobile nanoparticles.
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Affiliation(s)
- Young Kwang Lee
- Department of Chemistry, Seoul National University, Seoul 151-747 (South Korea); Howard Hughes Medical Institute and Department of Chemistry, University of California, Berkeley, CA 94720 (USA)
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