Laser-based micro- and nanofabrication for applications in biomedicine

Koch, Lothar; Sajti, Laszlo; Schwenke, Andreas; Klein, Sabine; Unger, Claudia; Gruene, Martin; Deiwick, Andrea; Schlie, Sabrina; Chichkov, Boris N.

doi:10.1063/1.4739907

Cited by 4 publications

(3 citation statements)

References 43 publications

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“…304 (Figure 38). 300 The formed adherens and gap junctions allow for intercellular adhesion and communication and successful synthetic tissue formation. (Figure 40).…”

Section: D Bioprintingmentioning

confidence: 99%

Innovation in Layer-by-Layer Assembly

et al. 2016

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Methods for depositing thin films are important in generating functional materials for diverse applications in a wide variety of fields. Over the last half-century, the layer-by-layer assembly of nanoscale films has received intense and growing interest. This has been fueled by innovation in the available materials and assembly technologies, as well as the film-characterization techniques. In this Review, we explore, discuss, and detail innovation in layer-by-layer assembly in terms of past and present developments, and we highlight how these might guide future advances. A particular focus is on conventional and early developments that have only recently regained interest in the layer-by-layer assembly field. We then review unconventional assemblies and approaches that have been gaining popularity, which include inorganic/organic hybrid materials, cells and tissues, and the use of stereocomplexation, patterning, and dip-pen lithography, to name a few. A relatively recent development is the use of layer-by-layer assembly materials and techniques to assemble films in a single continuous step. We name this "quasi"-layer-by-layer assembly and discuss the impacts and innovations surrounding this approach. Finally, the application of characterization methods to monitor and evaluate layer-by-layer assembly is discussed, as innovation in this area is often overlooked but is essential for development of the field. While we intend for this Review to be easily accessible and act as a guide to researchers new to layer-by-layer assembly, we also believe it will provide insight to current researchers in the field and help guide future developments and innovation.

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“…304 (Figure 38). 300 The formed adherens and gap junctions allow for intercellular adhesion and communication and successful synthetic tissue formation. (Figure 40).…”

Section: D Bioprintingmentioning

confidence: 99%

Innovation in Layer-by-Layer Assembly

et al. 2016

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“…Using a strong external stimulus such as an intense laser pulse, it is possible to induce exotic transient states of matter that upon relaxation result in materials with altered optical, thermal, mechanical, or chemical properties. Ultrashort laser pulses are used in materials nanostructuring for applications in plasmonics [ 2 ], catalysis [ 3 ], photovoltaics [ 4 ], and biomedicine [ 5 ]. Reversible laser-induced switching of material structure between crystalline and amorphous phases can be used for efficient data storage [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Electron–Phonon Coupling and Nonthermal Effects in Gold Nano-Objects at High Electronic Temperatures

Medvedev

Milov

2022

Materials

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Laser irradiation of metals is widely used in research and applications. In this work, we study how the material geometry affects electron–phonon coupling in nano-sized gold samples: an ultrathin layer, nano-rod, and two types of gold nanoparticles (cubic and octahedral). We use the combined tight-binding molecular dynamics Boltzmann collision integral method implemented within XTANT-3 code to evaluate the coupling parameter in irradiation targets at high electronic temperatures (up to Te~20,000 K). Our results show that the electron–phonon coupling in all objects with the same fcc atomic structure (bulk, layer, rod, cubic and octahedral nanoparticles) is nearly identical at electronic temperatures above Te~7000 K, independently of geometry and dimensionality. At low electronic temperatures, reducing dimensionality reduces the coupling parameter. Additionally, nano-objects under ultrafast energy deposition experience nonthermal damage due to expansion caused by electronic pressure, in contrast to bulk metal. Nano-object ultrafast expansion leads to the ablation/emission of atoms and disorders the inside of the remaining parts. These nonthermal atomic expansion and melting are significantly faster than electron–phonon coupling, forming a dominant effect in nano-sized gold.

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“…Such bubbles were found and studied in [ 10 – 12 ]. Surface nanostructures are also employed for colorizing, tribology, and manipulations with wettability [ 13 – 15 ] as well as in bio-applications [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Solitary Nanostructures Produced by Ultrashort Laser Pulse

Inogamov

Zhakhovsky²,

Хохлов

et al. 2016

Nanoscale Res Lett

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Laser-produced surface nanostructures show considerable promise for many applications while fundamental questions concerning the corresponding mechanisms of structuring are still debated. Here, we present a simple physical model describing those mechanisms happened in a thin metal film on dielectric substrate irradiated by a tightly focused ultrashort laser pulse. The main ingredients included into the model are (i) the film–substrate hydrodynamic interaction, melting and separation of the film from substrate with velocity increasing with increase of absorbed fluence; (ii) the capillary forces decelerating expansion of the expanding flying film; and (iii) rapid freezing into a solid state if the rate of solidification is comparable or larger than hydrodynamic velocities. The developed model and performed simulations explain appearance of microbump inside the focal spot on the film surface. The model follows experimental findings about gradual transformation of the bump from small parabolic to a conical shape and to the bump with a jet on its tip with increasing fluence. Disruption of the bump as a result of thinning down the liquid film to a few interatomic distances or due to mechanical break-off of solid film is described together with the jetting and formation of one or many droplets. Developed theory opens door for optimizing laser parameters for intended nanostructuring in applications.

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Laser-based micro- and nanofabrication for applications in biomedicine

Cited by 4 publications

References 43 publications

Innovation in Layer-by-Layer Assembly

Innovation in Layer-by-Layer Assembly

Electron–Phonon Coupling and Nonthermal Effects in Gold Nano-Objects at High Electronic Temperatures

Solitary Nanostructures Produced by Ultrashort Laser Pulse

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