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Callens SJP, Fan D, van Hengel IAJ, Minneboo M, Díaz-Payno PJ, Stevens MM, Fratila-Apachitei LE, Zadpoor AA. Emergent collective organization of bone cells in complex curvature fields. Nat Commun 2023; 14:855. [PMID: 36869036 PMCID: PMC9984480 DOI: 10.1038/s41467-023-36436-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/31/2023] [Indexed: 03/05/2023] Open
Abstract
Individual cells and multicellular systems respond to cell-scale curvatures in their environments, guiding migration, orientation, and tissue formation. However, it remains largely unclear how cells collectively explore and pattern complex landscapes with curvature gradients across the Euclidean and non-Euclidean spectra. Here, we show that mathematically designed substrates with controlled curvature variations induce multicellular spatiotemporal organization of preosteoblasts. We quantify curvature-induced patterning and find that cells generally prefer regions with at least one negative principal curvature. However, we also show that the developing tissue can eventually cover unfavorably curved territories, can bridge large portions of the substrates, and is often characterized by collectively aligned stress fibers. We demonstrate that this is partly regulated by cellular contractility and extracellular matrix development, underscoring the mechanical nature of curvature guidance. Our findings offer a geometric perspective on cell-environment interactions that could be harnessed in tissue engineering and regenerative medicine applications.
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Affiliation(s)
- Sebastien J P Callens
- Department of Biomechanical Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft, 2628CD, The Netherlands. .,Department of Materials, Department of Bioengineering, and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, UK.
| | - Daniel Fan
- Department of Precision and Microsystems Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft, 2628CD, The Netherlands
| | - Ingmar A J van Hengel
- Department of Biomechanical Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft, 2628CD, The Netherlands
| | - Michelle Minneboo
- Department of Biomechanical Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft, 2628CD, The Netherlands
| | - Pedro J Díaz-Payno
- Department of Biomechanical Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft, 2628CD, The Netherlands.,Department of Orthopedics and Sports Medicine, Erasmus MC University Medical Center, Rotterdam, 3015GD, The Netherlands
| | - Molly M Stevens
- Department of Materials, Department of Bioengineering, and Institute of Biomedical Engineering, Imperial College London, London, SW7 2AZ, UK
| | - Lidy E Fratila-Apachitei
- Department of Biomechanical Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft, 2628CD, The Netherlands
| | - Amir A Zadpoor
- Department of Biomechanical Engineering, Delft University of Technology (TU Delft), Mekelweg 2, Delft, 2628CD, The Netherlands
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Juang YJ, Chiu YJ. Fabrication of Polymer Microfluidics: An Overview. Polymers (Basel) 2022; 14:polym14102028. [PMID: 35631909 PMCID: PMC9147778 DOI: 10.3390/polym14102028] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 04/30/2022] [Accepted: 05/02/2022] [Indexed: 11/16/2022] Open
Abstract
Microfluidic platform technology has presented a new strategy to detect and analyze analytes and biological entities thanks to its reduced dimensions, which results in lower reagent consumption, fast reaction, multiplex, simplified procedure, and high portability. In addition, various forces, such as hydrodynamic force, electrokinetic force, and acoustic force, become available to manipulate particles to be focused and aligned, sorted, trapped, patterned, etc. To fabricate microfluidic chips, silicon was the first to be used as a substrate material because its processing is highly correlated to semiconductor fabrication techniques. Nevertheless, other materials, such as glass, polymers, ceramics, and metals, were also adopted during the emergence of microfluidics. Among numerous applications of microfluidics, where repeated short-time monitoring and one-time usage at an affordable price is required, polymer microfluidics has stood out to fulfill demand by making good use of its variety in material properties and processing techniques. In this paper, the primary fabrication techniques for polymer microfluidics were reviewed and classified into two categories, e.g., mold-based and non-mold-based approaches. For the mold-based approaches, micro-embossing, micro-injection molding, and casting were discussed. As for the non-mold-based approaches, CNC micromachining, laser micromachining, and 3D printing were discussed. This review provides researchers and the general audience with an overview of the fabrication techniques of polymer microfluidic devices, which could serve as a reference when one embarks on studies in this field and deals with polymer microfluidics.
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Affiliation(s)
- Yi-Je Juang
- Department of Chemical Engineering, National Cheng Kung University, No. 1 University Road, Tainan 70101, Taiwan;
- Core Facility Center, National Cheng Kung University, No. 1 University Road, Tainan 70101, Taiwan
- Research Center for Energy Technology and Strategy, National Cheng Kung University, No.1 University Road, Tainan 70101, Taiwan
- Correspondence: ; Tel.: +886-62757575 (ext. 62653); Fax: +886-62344496
| | - Yu-Jui Chiu
- Department of Chemical Engineering, National Cheng Kung University, No. 1 University Road, Tainan 70101, Taiwan;
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Li S, Nguyen SV, Lee BK. Role of heat treatment in improving replication quality of PDMS double-casting. SOFT MATTER 2022; 18:3473-3478. [PMID: 35475435 DOI: 10.1039/d1sm01828k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
An efficient and eco-friendly method utilizing the heat treatment of the PDMS master is proposed for improving the replication quality of PDMS double-casting. The effects of heat treatment on interfacial adhesion are investigated in terms of uncured low molecular weight chains, surface energy, and surface roughness. The PDMS master treated at 150 °C for 72 h shows the highest replication quality of micropatterns with a diameter and height of 30 μm.
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Affiliation(s)
- Shichen Li
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
| | - Son Van Nguyen
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
| | - Bong-Kee Lee
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
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A Systematic Approach for Developing 3D High-Quality PDMS Microfluidic Chips Based on Micromilling Technology. MICROMACHINES 2021; 13:mi13010006. [PMID: 35056171 PMCID: PMC8779272 DOI: 10.3390/mi13010006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 12/16/2021] [Accepted: 12/20/2021] [Indexed: 12/26/2022]
Abstract
In recent years, there has been an increased interest in exploring the potential of micro-and mesoscale milling technologies for developing cost-effective microfluidic systems with high design flexibility and a rapid microfabrication process that does not require a cleanroom. Nevertheless, the number of current studies aiming to fully understand and establish the benefits of this technique in developing high-quality microsystems with simple integrability is still limited. In the first part of this study, we define a systematic and adaptable strategy for developing high-quality poly(methyl methacrylate) (PMMA)-based micromilled structures. A case study of the average surface roughness (Ra) minimization of a cuboid column is presented to better illustrate some of the developed strategies. In this example, the Ra of a cuboid column was reduced from 1.68 μm to 0.223 μm by implementing milling optimization and postprocessing steps. In the second part of this paper, new strategies for developing a 3D microsystem were introduced by using a specifically designed negative PMMA master mold for polydimethylsiloxane (PDMS) double-casting prototyping. The reported results in this study demonstrate the robustness of the proposed approach for developing microfluidic structures with high surface quality and structural integrability in a reasonable amount of time.
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Lee HJ, Chun KY, Oh JH, Han CS. Wearable Triboelectric Strain-Insensitive Pressure Sensors Based on Hierarchical Superposition Patterns. ACS Sens 2021; 6:2411-2418. [PMID: 34100591 DOI: 10.1021/acssensors.1c00640] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Recently, wearable triboelectric sensors capable of self-powering, which can be widely used in artificial skin and robotics, have received much attention. Herein, we develop a stretchable triboelectric pressure sensor with a new pattern by superimposing two patterns using both polystyrene beads and UV-ozone treatment. This patterned structure works more sensitively to pressure than a general planar and one-kind patterned structure. The sensor is constructed by sandwiching styrene butadiene rubber (SBR) and poly(dimethylsiloxane) (PDMS). It demonstrates a high sensitivity of 0.078 kPa-1 (0-20 kPa), a low detection limit (1.2 kPa), and pressure sensitivity maintained under 40% strain. The detection behavior of the strain-insensitive triboelectric sensor against pressure is very consistent with the simulation based on the theory. In applications, we successfully detect various human motions, not only small motions such as bending fingers but also large motions such as standing up and raising arms.
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Affiliation(s)
- Ho Jung Lee
- School of Mechanical Engineering, College of Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea
| | - Kyoung-Yong Chun
- Institute of Advanced Machinery Design Technology, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea
| | - Jun Ho Oh
- School of Mechanical Engineering, College of Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea
| | - Chang-Soo Han
- School of Mechanical Engineering, College of Engineering, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea
- Institute of Advanced Machinery Design Technology, Korea University, Anam-Dong, Seongbuk-Gu, Seoul 136-713, Republic of Korea
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Ansari A, Trehan R, Watson C, Senyo S. Increasing Silicone Mold Longevity: A Review of Surface Modification Techniques for PDMS-PDMS Double Casting. SOFT MATERIALS 2020; 19:388-399. [PMID: 35035304 PMCID: PMC8758012 DOI: 10.1080/1539445x.2020.1850476] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 11/10/2020] [Indexed: 06/14/2023]
Abstract
Polydimethyl siloxane (PDMS) has been used extensively for microfluidic devices due to its chemical properties allowing for rapid molding and versatile biological application. Soft lithography based PDMS fabrication primarily comprises casting from patterned photoresist on a silicon wafer. The patterned photoresist is often replaced with the cast PDMS as a more durable template mold for final PDMS fabrication that is less fragile and expensive. PDMS-PDMS double casting prolongs the longevity of soft lithography molds and reduces overall costs to microfuidic applications. A common end to the lifetime of PDMS negative masters is the risk of bonding between the replicate and mold and distorted topographrical features. This review examines common chemical and physical debonding approaches between PDMS-PDMS castings to exend the lifetime of PDMS masters.
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Affiliation(s)
- Ali Ansari
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio
| | - Rajiv Trehan
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio
| | - Craig Watson
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio
| | - Samuel Senyo
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio
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Lyons NP, Cui S, Ketchum RS, Kim KJ, Norwood RA. Thermal compensation of molded silicone optics. APPLIED OPTICS 2020; 59:G99-G106. [PMID: 32749321 DOI: 10.1364/ao.392233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 05/17/2020] [Indexed: 06/11/2023]
Abstract
Optical grade silicone has various properties that make it attractive for solar concentrators, such as excellent transmission across the solar spectrum and flexible moldability for freeform profiles. In this study, a glass-silicone lens structure is proposed to reduce the optothermal effect on the silicone lens. Experimental measurements and simulation modeling results demonstrate that the focal length sensitivity of the glass-silicone lens with respect to temperature can be reduced by a factor of 10 when compared to a silicone lens alone. This model has been extended to the simulation of a proposed two-stage silicone solar concentrator, consisting of an array of acylindrical lenslets and rows of waveguides that focus light onto microphotovoltaic cells. The optical efficiency of the solar concentration system showed a change of less than 10% compared to the efficiency at room temperature for temperature changes from -10∘C to 70°C.
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A tool for designing tree-like concentration gradient generators for lab-on-a-chip applications. Chem Eng Sci 2020. [DOI: 10.1016/j.ces.2019.115339] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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9
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Cui S, Lyons NP, Diaz LR, Ketchum R, Kim KJ, Yuan HC, Frasier M, Pan W, Norwood RA. Silicone optical elements for cost-effective freeform solar concentration. OPTICS EXPRESS 2019; 27:A572-A580. [PMID: 31053029 DOI: 10.1364/oe.27.00a572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Accepted: 03/29/2019] [Indexed: 06/09/2023]
Abstract
The use of silicone optical elements is demonstrated for a concentrated photovoltaic system. These components show over 96% transmission through most of the solar spectrum and excellent temperature stability. Unique moldability enables the use of complex freeform designs. A light, compact, and cost-effective concentrated photovoltaic system based on silicone optics is proposed. In this system, air-plasma treatment is utilized to overcome the mechanical properties of silicone and difficulties with coating to reduce Fresnel loss. Lens arrays and waveguides are fabricated by injection molding following freeform optical design by LightTools. First-order characterizations are also performed.
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Pulsipher KW, Hammer DA, Lee D, Sehgal CM. Engineering Theranostic Microbubbles Using Microfluidics for Ultrasound Imaging and Therapy: A Review. ULTRASOUND IN MEDICINE & BIOLOGY 2018; 44:2441-2460. [PMID: 30241729 PMCID: PMC6643280 DOI: 10.1016/j.ultrasmedbio.2018.07.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 07/05/2018] [Accepted: 07/27/2018] [Indexed: 05/05/2023]
Abstract
Microbubbles interact with ultrasound in various ways to enable their applications in ultrasound imaging and diagnosis. To generate high contrast and maximize therapeutic efficacy, microbubbles of high uniformity are required. Microfluidic technology, which enables precise control of small volumes of fluid at the sub-millimeter scale, has provided a versatile platform on which to produce highly uniform microbubbles for potential applications in ultrasound imaging and diagnosis. Here, we describe fundamental microfluidic principles and the most common types of microfluidic devices used to produce sub-10 μm microbubbles, appropriate for biomedical ultrasound. Bubbles can be engineered for specific applications by tailoring the bubble size, inner gas and shell composition and by functionalizing for additional imaging modalities, therapeutics or targeting ligands. To translate the laboratory-scale discoveries to widespread clinical use of these microfluidic-based microbubbles, increased bubble production is needed. We present various strategies recently developed to improve scale-up. We conclude this review by describing some outstanding problems in the field and presenting areas for future use of microfluidics in ultrasound.
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Affiliation(s)
- Katherine W Pulsipher
- Department of Chemical and Biomolecular Engineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Daniel A Hammer
- Department of Chemical and Biomolecular Engineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania, USA; Department of Bioengineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Daeyeon Lee
- Department of Chemical and Biomolecular Engineering, School of Engineering and Applied Science, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Chandra M Sehgal
- Department of Radiology, University of Pennsylvania Medical Center, Philadelphia, Pennsylvania, USA.
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11
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Protocol of thermal aging against the swelling of poly(dimethylsiloxane) and physical insight in swelling regimes. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.02.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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