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Wei M, Xu W, Gao F, Li X, Carvalho WSP, Zhang X, Serpe MJ. Stimuli-responsive microgels for controlled deposition of gold nanoparticles on surfaces. NANOSCALE ADVANCES 2020; 2:5242-5253. [PMID: 36132044 PMCID: PMC9417113 DOI: 10.1039/d0na00656d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Accepted: 10/05/2020] [Indexed: 06/15/2023]
Abstract
A variety of gold nanoparticle (AuNP) core/poly(N-isopropylacrylamide) (pNIPAm) shell microgels (Au@pNIPAm) were generated using seed-mediated polymerization. The shell thickness and AuNP core diameter were easily tunable at the time of synthesis. The resultant Au@pNIPAm microgels were characterized via photon-correlation spectroscopy, transmission electron microscopy and ultraviolet-visible spectroscopy. AuNP arrays were generated by "painting" the microgels on a surface, using the shell thickness to define the distance between the AuNPs, followed by shell removal via plasma etching. We found that when the pNIPAm shell thickness decreased (via its tuning at the time of synthesis or deposition at elevated temperature at which the shell is collapsed) the AuNPs were closer to one another. We also showed that via sequential deposition Au@pNIPAm microgels with different AuNP core sizes could be deposited on a single surface. The presented "painting protocol" offers a facile way to coat large area surfaces quickly which is not easily achievable using other approaches. We envision that this approach is extremely versatile, allowing a number of different nanomaterials embedded in pNIPAm shells to be deposited/patterned on surfaces. With the control over the deposition on the surface that we show here, we hope that the Au@pNIPAm microgels will find use in lithography/surface patterning applications.
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Affiliation(s)
- Menglian Wei
- Key Laboratory of Optoelectronic Devices and Systems, College of Physics and Optoelectronic Engineering, Shenzhen University Shenzhen 518060 China
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive Edmonton T6G 2G2 Canada
| | - Wenwen Xu
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive Edmonton T6G 2G2 Canada
| | - Feng Gao
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive Edmonton T6G 2G2 Canada
| | - Xue Li
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive Edmonton T6G 2G2 Canada
| | - Wildemar S P Carvalho
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive Edmonton T6G 2G2 Canada
| | - Xueji Zhang
- Key Laboratory of Optoelectronic Devices and Systems, College of Physics and Optoelectronic Engineering, Shenzhen University Shenzhen 518060 China
| | - Michael J Serpe
- Department of Chemistry, University of Alberta 11227 Saskatchewan Drive Edmonton T6G 2G2 Canada
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Barui A, Chowdhury F, Pandit A, Datta P. Rerouting mesenchymal stem cell trajectory towards epithelial lineage by engineering cellular niche. Biomaterials 2018; 156:28-44. [DOI: 10.1016/j.biomaterials.2017.11.036] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 10/22/2017] [Accepted: 11/21/2017] [Indexed: 02/06/2023]
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Chen W, Shao Y, Li X, Zhao G, Fu J. Nanotopographical Surfaces for Stem Cell Fate Control: Engineering Mechanobiology from the Bottom. NANO TODAY 2014; 9:759-784. [PMID: 25883674 PMCID: PMC4394389 DOI: 10.1016/j.nantod.2014.12.002] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
During embryogenesis and tissue maintenance and repair in an adult organism, a myriad of stem cells are regulated by their surrounding extracellular matrix (ECM) enriched with tissue/organ-specific nanoscale topographical cues to adopt different fates and functions. Attributed to their capability of self-renewal and differentiation into most types of somatic cells, stem cells also hold tremendous promise for regenerative medicine and drug screening. However, a major challenge remains as to achieve fate control of stem cells in vitro with high specificity and yield. Recent exciting advances in nanotechnology and materials science have enabled versatile, robust, and large-scale stem cell engineering in vitro through developments of synthetic nanotopographical surfaces mimicking topological features of stem cell niches. In addition to generating new insights for stem cell biology and embryonic development, this effort opens up unlimited opportunities for innovations in stem cell-based applications. This review is therefore to provide a summary of recent progress along this research direction, with perspectives focusing on emerging methods for generating nanotopographical surfaces and their applications in stem cell research. Furthermore, we provide a review of classical as well as emerging cellular mechano-sensing and -transduction mechanisms underlying stem cell nanotopography sensitivity and also give some hypotheses in regard to how a multitude of signaling events in cellular mechanotransduction may converge and be integrated into core pathways controlling stem cell fate in response to extracellular nanotopography.
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Affiliation(s)
- Weiqiang Chen
- Integrated Biosystems and Biomechanics Laboratory, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Yue Shao
- Integrated Biosystems and Biomechanics Laboratory, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Xiang Li
- Integrated Biosystems and Biomechanics Laboratory, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Gang Zhao
- Department of Electronic Science and Technology, University of Science and Technology of China, Hefei 230027, P. R. China
| | - Jianping Fu
- Integrated Biosystems and Biomechanics Laboratory, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
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Chang WY, Wu Y, Chung YC. Facile fabrication of ordered nanostructures from protruding nanoballs to recessional nanosuckers via solvent treatment on covered nanosphere assembled monolayers. NANO LETTERS 2014; 14:1546-1550. [PMID: 24512372 DOI: 10.1021/nl4048042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present a facile lithographic nanosphere production process by laminating a nanosphere monolayer with a UV resin and applying various gentle solvent treatments to produce "bottom-up" and "bottom-down" nonclose-packed patterns and investigate their practical applications in nanolenses for optical display and nanosuckers for adhesion. The solvents effect depending on its solubility parameter and solubility tendency toward the interior polystyrene nanospheres was discussed. The polymer-based nanosucker pattern displays shear adhesion force as high as 75.2 N/cm(2).
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Affiliation(s)
- Wan-Yi Chang
- Department of Chemical and Materials Engineering, National University of Kaohsiung , Kaohsiung 811, Taiwan Republic of China
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