scholarly journals Controlled Arrangement of Gold Nanoparticles on Planar Surfaces via Constrained Dewetting of Surface-Grafted RAFT Polymer

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1214
Author(s):  
Katharina Hendrich ◽  
Wentao Peng ◽  
Philipp Vana
Keyword(s):  
Gold Nanoparticles ◽  
Structural Stability ◽  
Raft Polymerization ◽  
Star Polymers ◽  
Regular Structure ◽  
Gold Surface ◽  
Nanocomposite Films ◽  
Gold Surfaces ◽  
Planar Surfaces ◽  
End Groups

Linear and four-arm star polystyrene samples prepared by RAFT polymerization were grafted to gold surfaces directly via their thiocarbonylthio-end groups. Nanoscale polymer patterns were subsequently formed via constrained dewetting. The patterned polymer films then served as a template for the precise arrangement of gold nanoparticles in a monolayer with a well-defined and regular structure. Using star polymers as a linker between the planar gold surface and the particles, the structural stability of the arranged particles can be further enhanced. The surface-bound nanocomposite films made of polymer and nanoparticles can also reversibly switch their nanostructures by simple wetting or dewetting treatment.

PEGylated Gold Nanoparticles Functionalized with β-Cyclodextrin Inclusion Complexes: Towards Metal Nanoparticle - Polymer - Carbohydrate Cluster Biohybrid Materials

2010 ◽  
Vol 63 (8) ◽  
pp. 1245 ◽  
Author(s):  
Jingquan Liu ◽  
Eki Setijadi ◽  
Yingkai Liu ◽  
Michael R. Whittaker ◽  
Cyrille Boyer ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raft Polymerization ◽  
Gold Surface ◽  
Attenuated Total Reflection ◽  
Metal Nanoparticle ◽  
Surface Plasmon Resonance Analysis ◽  
Resonance Analysis ◽  
Cyclodextrin Inclusion Complexes ◽  
Reversible Addition ◽  
Raft Agent

A cholesterol-functional trithiocarbonate reversible addition–fragmentation chain transfer (RAFT) agent was synthesized and employed to generate well-defined poly(polyethylene glycol) acrylate with cholesterol chain termini using RAFT polymerization. Subsequently, the polymers were grafted onto the surface of gold nanoparticles using the trithiocarbonate functionality to bind to the gold surface. The cholesterol moieties were then modified via complexation with β-cyclodextrin. The step-by-step modification of gold nanoparticles was characterized by dynamic light scattering, attenuated total reflection infrared spectroscopy and surface plasmon resonance analysis.

From 0-dimension to 1-dimensions: Au nanocrystals as versatile plasmonic photocatalyst for broadband light induced RAFT polymerization

2021 ◽  
Vol 12 (16) ◽  
pp. 2439-2446
Author(s):  
Junle Zhang ◽  
Mengya Li ◽  
Yanjie He ◽  
Xiaomeng Zhang ◽  
Zhe Cui ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raft Polymerization ◽  
Plasmonic Photocatalyst

Gold nanoparticles and nanorods were utilized as the catalyst for photo-induced RAFT polymerization, because of their strong LSPR performance.

scholarly journals Introduction of Stilbene Derivatives and Cinnamate Ester Derivatives at the ω-End Groups of Poly(Methyl Methacrylate) Prepared via RAFT Polymerization

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2449
Author(s):  
Martyn Dobinson ◽  
Philip Hodge ◽  
Trevor Wear
Keyword(s):  
Nmr Spectroscopy ◽  
Methyl Methacrylate ◽  
Raft Polymerization ◽  
19F Nmr ◽  
19F Nmr Spectroscopy ◽  
Poly Methyl Methacrylate ◽  
End Groups ◽  
Stilbene Derivatives

The capping of “living” poly(methyl methacrylate) (PMMA) and “living” polystyrene (PS), both prepared by the RAFT technique, with various olefins was screened using 19F-NMR spectroscopy. The capping of “living” PMMA with a labeled stilbene was as high as 63% and with certain cinnamate esters was essentially quantitative, but the capping of “living” polystyrene with all the olefins investigated was generally poor.

Advances in RAFT polymerization: the synthesis of polymers with defined end-groups

Polymer ◽  
2005 ◽  
Vol 46 (19) ◽  
pp. 8458-8468 ◽  
Author(s):  
Graeme Moad ◽  
Y.K. Chong ◽  
Almar Postma ◽  
Ezio Rizzardo ◽  
San H. Thang
Keyword(s):  
Raft Polymerization ◽  
End Groups

Probing the conformational energetics of alkyl thiols on gold surfaces by means of a morphing/steering non-equilibrium tool

2015 ◽  
Vol 17 (12) ◽  
pp. 8038-8052 ◽  
Author(s):  
Andrea Piserchia ◽  
Mirco Zerbetto ◽  
Diego Frezzato
Keyword(s):  
Free Energy ◽  
Gold Surface ◽  
Gold Surfaces ◽  
Jarzynski’S Equality ◽  
Torsion Free ◽  
Non Equilibrium

Jarzynski's equality is applied to compute the torsion free energy, bond-by-bond, for a probe alkyl thiol tethered to a gold surface.

scholarly journals Surface Adsorption of the Alpha-Emitter Astatine-211 to Gold Nanoparticles Is Stable In Vivo and Potentially Useful in Radionuclide Therapy

2021 ◽  
Vol 2 (4) ◽  
pp. 196-207
Author(s):  
Emanuel Sporer ◽  
Christian B. M. Poulie ◽  
Sture Lindegren ◽  
Emma Aneheim ◽  
Holger Jensen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Adsorption ◽  
Radiochemical Yield ◽  
Gold Surface ◽  
Mouse Serum ◽  
Control Group ◽  
Alpha Emitter ◽  
Before And After ◽  
The Stability

Targeted α-therapy (TAT) can eradicate tumor metastases while limiting overall toxicity. One of the most promising α-particle emitters is astatine-211 (211At). However, 211At-carbon bonds are notoriously unstable in vivo and no chelators are available. This hampers its adoption in TAT. In this study, the stability of 211At on the surface of gold nanoparticles (AuNPs) was investigated. The employed AuNPs had sizes in the 25–50 nm range. Radiolabeling by non-specific surface-adsorption in >99% radiochemical yield was achieved by mixing 211At and AuNPs both before and after polyethylene glycol (PEG) coating. The resulting 211At-AuNPs were first challenged by harsh oxidation with sodium hypochlorite, removing roughly 50% of the attached 211At. Second, incubation in mouse serum followed by a customized stability test, showed a stability of >95% after 4 h in serum. This high stability was further confirmed in an in vivo study, with comparison to a control group of free 211At. The AuNP-associated 211At showed low uptake in stomach and thyroid, which are hallmark organs of uptake of free 211At, combined with long circulation and high liver and spleen uptake, consistent with nanoparticle biodistribution. These results support that gold surface-adsorbed 211At has high biological stability and is a potentially useful delivery system in TAT.

Synthesis of Stable Peptide Nucleic Acid-Modified Gold Nanoparticles and their Assembly onto Gold Surfaces

2013 ◽  
Vol 52 (15) ◽  
pp. 4217-4220 ◽  
Author(s):  
Philipp Anstaett ◽  
Yuanhui Zheng ◽  
Thibaut Thai ◽  
Alison M. Funston ◽  
Udo Bach ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Nucleic Acid ◽  
Peptide Nucleic Acid ◽  
Gold Surfaces

Well-Defined Glycopolymers via RAFT Polymerization: Stabilization of Gold Nanoparticles

2014 ◽  
Vol 215 (19) ◽  
pp. 1915-1924 ◽  
Author(s):  
Marta Álvarez-Paino ◽  
Vanesa Bordegé ◽  
Rocío Cuervo-Rodríguez ◽  
Alexandra Muñoz-Bonilla ◽  
Marta Fernández-García
Keyword(s):  
Gold Nanoparticles ◽  
Raft Polymerization

scholarly journals Eco-friendly synthesis and catalytic application of chitosan/gold/carbon nanotube nanocomposite films

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60180-60186 ◽  
Author(s):  
Saira Bibi ◽  
Gareth J. Price ◽  
Tariq Yasin ◽  
Mohsan Nawaz
Keyword(s):  
Carbon Nanotubes ◽  
Gold Nanoparticles ◽  
Carbon Nanotube ◽  
Nanocomposite Films ◽  
Nanocomposite Membranes ◽  
Catalytic Membranes ◽  
Catalytic Application

Novel eco-friendly chitosan nanocomposite membranes containing gold nanoparticles and carbon nanotubes (CNTs) have been synthesized to produce reusable catalytic membranes.

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