Characterization of Poly(ethylene oxide)-Capped Gold Nanoparticles in Water by Means of Transmission Electron Microscopy, Thermogravimetric Analysis, Mass Density, and Small Angle Scattering

2010 ◽  
Vol 114 (15) ◽  
pp. 6937-6943 ◽  
Author(s):  
Marco Maccarini ◽  
Giuseppe Briganti ◽  
Simona Rucareanu ◽  
Xue-Dong Lui ◽  
Raffaele Sinibaldi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gold Nanoparticles ◽  
Mass Density ◽  
Transmission Electron ◽  
Angle Scattering ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Means Of Transmission

Synthesis and Characterization of Water-Soluble Monolayer-Protected Gold Nanoparticles

2011 ◽  
Vol 415-417 ◽  
pp. 617-620 ◽  
Author(s):  
Yan Su ◽  
Ying Yun Lin ◽  
Yu Li Fu ◽  
Fan Qian ◽  
Xiu Pei Yang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Particle Size ◽  
Gold Nanoparticles ◽  
Average Particle Size ◽  
Water Soluble ◽  
Synthesis And Characterization ◽  
Average Particle ◽  
Transmission Electron

Water-soluble gold nanoparticles (AuNPs) were prepared using 2-mercapto-4-methyl-5- thiazoleacetic acid (MMTA) as a stabilizing agent and sodium borohydride (NaBH4) as a reducing agent. The AuNPs product was analyzed by transmission electron microscopy (TEM), UV-vis absorption spectroscopy and Fourier transform infrared spectroscopy (FTIR). The TEM image shows that the particles were well-dispersed and their average particle size is about 5 nm. The UV-vis absorption and FTIR spectra confirm that the MMTA-AuNPs was stabilized by the carboxylate ions present on the surface of the AuNPs.

High-genus multicompartment vesicles evolved from large compound micelles

2021 ◽  
Author(s):  
Sha Lin ◽  
Fangyingkai Wang ◽  
Jianzhong Du
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ethylene Oxide ◽  
Fluorescence Spectroscopy ◽  
Formation Process ◽  
High Genus ◽  
Transmission Electron ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Large Compound

We report a high-genus multicompartment vesicle (HGMV) that is self-assembled from poly(ethylene oxide)-block-poly[4-azophenyl-(2-carbamoyloxymethyl)ethyl methacrylate] (PEO43-b-PACEMA10). The formation process of these HGMVs was investigated by transmission electron microscopy (TEM), fluorescence spectroscopy,...

scholarly journals Unraveling the complexity of amyloid polymorphism using gold nanoparticles and cryo-EM

2020 ◽  
Vol 117 (12) ◽  
pp. 6866-6874 ◽  
Author(s):  
Urszula Cendrowska ◽  
Paulo Jacob Silva ◽  
Nadine Ait-Bouziad ◽  
Marie Müller ◽  
Zekiye Pelin Guven ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gold Nanoparticles ◽  
Amyloid Fibrils ◽  
Imaging Techniques ◽  
Postmortem Brain ◽  
Structural Basis ◽  
Transmission Electron

Increasing evidence suggests that amyloid polymorphism gives rise to different strains of amyloids with distinct toxicities and pathology-spreading properties. Validating this hypothesis is challenging due to a lack of tools and methods that allow for the direct characterization of amyloid polymorphism in hydrated and complex biological samples. Here, we report on the development of 11-mercapto-1-undecanesulfonate-coated gold nanoparticles (NPs) that efficiently label the edges of synthetic, recombinant, and native amyloid fibrils derived from different amyloidogenic proteins. We demonstrate that these NPs represent powerful tools for assessing amyloid morphological polymorphism, using cryogenic transmission electron microscopy (cryo-EM). The NPs allowed for the visualization of morphological features that are not directly observed using standard imaging techniques, including transmission electron microscopy with use of the negative stain or cryo-EM imaging. The use of these NPs to label native paired helical filaments (PHFs) from the postmortem brain of a patient with Alzheimer’s disease, as well as amyloid fibrils extracted from the heart tissue of a patient suffering from systemic amyloid light-chain amyloidosis, revealed a high degree of homogeneity across the fibrils derived from human tissue in comparison with fibrils aggregated in vitro. These findings are consistent with, and strongly support, the emerging view that the physiologic milieu is a key determinant of amyloid fibril strains. Together, these advances should not only facilitate the profiling and characterization of amyloids for structural studies by cryo-EM, but also pave the way to elucidate the structural basis of amyloid strains and toxicity, and possibly the correlation between the pathological and clinical heterogeneity of amyloid diseases.

scholarly journals Control of Inter-fiber Fusing for Nanofiber Webs via Electrospinning

2011 ◽  
Vol 6 (4) ◽  
pp. 155892501100600 ◽  
Author(s):  
Bharath K. Raghavan ◽  
Douglas W. Coffin
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Controlled Environment ◽  
Surrounding Environment ◽  
Transmission Electron ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Viable Method ◽  
Scanning Electron

Electrospinning provides a viable method to produce both single fibers and mats of nonwoven fibers. For a nonwoven mat, fusing of the fibers at intersections produces an integrated structure. The ability to spin fibrous mats of nanofibers with and without fusing between the fibers is demonstrated using poly(ethylene oxide) (PEO) fibers. The fusing was controlled by adjusting the amount of water vapor in the surrounding environment. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) images were used to evaluate the percent of fused fibers in the mat and the diameters of fibers. The major finding of this work is that fusing of fibers can be controlled during formation of a nanofibrous mat via electrospinning in a controlled environment.

scholarly journals pH-Dependence of the morphology of micelles formed by poly(2-vinylpyridine)-block-poly(ethylene oxide) copolymers in water

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Jean-François Gohy ◽  
Sandrine Mores ◽  
Sunil K. Varshney ◽  
Jian-Xin Zhang ◽  
Robert Jérôme
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ethylene Oxide ◽  
Ph Dependence ◽  
Minor Component ◽  
Transmission Electron ◽  
Poly Ethylene Oxide ◽  
Spherical Micelles ◽  
Poly Ethylene ◽  
Ph Range

AbstractThe morphology of micelles formed by two poly(2-vinylpyridine)-blockpoly( ethylene oxide) (P2VP-b-PEO) copolymers has been studied in phosphatebuffered water by dynamic light scattering and transmission electron microscopy. Spherical micelles are observed when the P2VP block is the minor component of the diblock copolymer. When P2VP dominates the composition, transition from spheres-to-rods-to-vesicles takes place in a narrow pH range that straddles the pKa of P2VP. This transition is controlled by the degree of protonation of the P2VP blocks. At high pH, the copolymer precipitates from the solution.

scholarly journals Quantitative 3D Characterization of Nanoporous Gold Nanoparticles by Transmission Electron Microscopy

2021 ◽  
pp. 1-9
Author(s):  
Christoph Mahr ◽  
Alexandra Dworzak ◽  
Marco Schowalter ◽  
Mehtap Oezaslan ◽  
Andreas Rosenauer
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Gold Nanoparticles ◽  
Nanoporous Gold ◽  
Transmission Electron

Abstract

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