polymer brushes
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Author(s):  
Guido C. Ritsema van Eck ◽  
Leonardo Chiappisi ◽  
Sissi de Beer
Keyword(s):  

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Yunjiang Jiang ◽  
Wan Zheng ◽  
Keith Tran ◽  
Elizabeth Kamilar ◽  
Jitender Bariwal ◽  
...  

AbstractTo dissect the antibiotic role of nanostructures from chemical moieties belligerent to both bacterial and mammalian cells, here we show the antimicrobial activity and cytotoxicity of nanoparticle-pinched polymer brushes (NPPBs) consisting of chemically inert silica nanospheres of systematically varied diameters covalently grafted with hydrophilic polymer brushes that are non-toxic and non-bactericidal. Assembly of the hydrophilic polymers into nanostructured NPPBs doesn’t alter their amicability with mammalian cells, but it incurs a transformation of their antimicrobial potential against bacteria, including clinical multidrug-resistant strains, that depends critically on the nanoparticle sizes. The acquired antimicrobial potency intensifies with small nanoparticles but subsides quickly with large ones. We identify a threshold size (dsilica ~ 50 nm) only beneath which NPPBs remodel bacteria-mimicking membrane into 2D columnar phase, the epitome of membrane pore formation. This study illuminates nanoengineering as a viable approach to develop nanoantibiotics that kill bacteria upon contact yet remain nontoxic when engulfed by mammalian cells.


Author(s):  
Xiaobo Wang ◽  
Xiaoqiang Chen ◽  
Lei Xing ◽  
Chun Mao ◽  
Hongxing Yu ◽  
...  

Correction for ‘Blood compatibility of a new zwitterionic bare metal stent with hyperbranched polymer brushes’ by Xiaobo Wang et al., J. Mater. Chem. B, 2013, 1, 5036–5044, DOI: 10.1039/C3TB20855A.


RSC Advances ◽  
2022 ◽  
Vol 12 (3) ◽  
pp. 1366-1374
Author(s):  
Bao-ying Zhang ◽  
Hai-nan Luo ◽  
Wei Zhang ◽  
Yang Liu

Polymer brushes possess unique changes in physical and chemical properties when they are exposed to external stimuli and have a wide range of applications.


Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4458
Author(s):  
Joanna Smenda ◽  
Karol Wolski ◽  
Kamila Chajec ◽  
Szczepan Zapotoczny

The synthesis of surface-grafted polymers with variable functionality requires the careful selection of polymerization methods that also enable spatially controlled grafting, which is crucial for the fabrication of, e.g., nano (micro) sensor or nanoelectronic devices. The development of versatile, simple, economical, and eco-friendly synthetic strategies is important for scaling up the production of such polymer brushes. We have recently shown that poly (3-methylthienyl methacrylate) (PMTM) and poly (3-trimethylsilyl-2-propynyl methacrylate) (PTPM) brushes with pendant thiophene and acetylene groups, respectively, could be used for the production of ladder-like conjugated brushes that are potentially useful in the mentioned applications. However, the previously developed syntheses of such brushes required the use of high volumes of reagents, elevated temperature, or high energy UV-B light. Therefore, we present here visible light-promoted metal-free surface-initiated ATRP (metal-free SI-ATRP) that allows the economical synthesis of PMTM and PTPM brushes utilizing only microliter volumes of reaction mixtures. The versatility of this approach was shown by the formation of homopolymers but also the block copolymer conjugated brushes (PMTM and PTPM blocks in both sequences) and patterned films using TEM grids serving as photomasks. A simple reaction setup with only a monomer, solvent, commercially available organic photocatalyst, and initiator decorated substrate makes the synthesis of these complex polymer structures achievable for non-experts and ready for scaling up.


Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4429
Author(s):  
Maria Simonova ◽  
Dmitry Ilgach ◽  
Ksenia Kaskevich ◽  
Maria Nepomnyashaya ◽  
Larisa Litvinova ◽  
...  

Novel polyfluorene polymer brushes with polymethacrylic acid side chains were obtained by atom transfer radical polymerization (ATRP) and activator generated by electron transfer (AGET) ATRP of tert-butyl methacrylate on polyfluorene multifunctional macroinitiator, followed by protonolysis of the tert-butyl groups of the side chains. Kinetics of polymerization and molecular weights were fully characterized. These polymer brushes luminesce in the blue region of the spectrum with high quantum yields (0.64–0.77). It was shown that the luminescence intensity of polymer brushes is higher than the luminescence intensity of the macroinitiator (0.61). Moreover, due to their amphiphilic nature, they can form unimolecular micelles when an alcohol solution of the polymer brush is injected into water. These properties can potentially be used in drug delivery and bioimaging.


2021 ◽  
Author(s):  
Yeongun Ko ◽  
Vi Khanh Truong ◽  
Sun Young Woo ◽  
Michael D. Dickey ◽  
Lilian Hsiao ◽  
...  
Keyword(s):  

2021 ◽  
pp. 15-19
Author(s):  
Miancheng Zou ◽  
Pengkun Zhao ◽  
Shuaidong Huo ◽  
Robert Göstl ◽  
Andreas Herrmann

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