scholarly journals Multimode Electron Tomography as a Tool to Characterize the Internal Structure and Morphology of Gold Nanoparticles

2018 ◽  
Vol 122 (25) ◽  
pp. 13522-13528 ◽  
Author(s):  
Naomi Winckelmans ◽  
Thomas Altantzis ◽  
Marek Grzelczak ◽  
Ana Sánchez-Iglesias ◽  
Luis M. Liz-Marzán ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Internal Structure ◽  
Electron Tomography ◽  
Structure And Morphology

3 D Characterization of Gold Nanoparticles Supported on Heavy Metal Oxide Catalysts by HAADF-STEM Electron Tomography

2009 ◽  
Vol 48 (29) ◽  
pp. 5313-5315 ◽  
Author(s):  
J. C. González ◽  
J. C. Hernández ◽  
M. López-Haro ◽  
E. del Río ◽  
J. J. Delgado ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Gold Nanoparticles ◽  
Metal Oxide ◽  
Electron Tomography ◽  
Oxide Catalysts ◽  
Metal Oxide Catalysts

scholarly journals FGF21 trafficking in intact human cells revealed by cryo-electron tomography with gold nanoparticles

eLife ◽  
2019 ◽  
Vol 8 ◽  
Author(s):  
Maia Azubel ◽  
Stephen D Carter ◽  
Jennifer Weiszmann ◽  
Jun Zhang ◽  
Grant J Jensen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Growth Factor ◽  
Cell Surface ◽  
Fibroblast Growth Factor ◽  
Electron Tomography ◽  
Outer Cell ◽  
Multivesicular Bodies ◽  
Fibroblast Growth ◽  
Human Adipocytes ◽  
Cryo Electron Tomography

The fibroblast growth factor FGF21 was labeled with molecularly defined gold nanoparticles (AuNPs), applied to human adipocytes, and imaged by cryo-electron tomography (cryo-ET). Most AuNPs were in pairs about 80 Å apart, on the outer cell surface. Pairs of AuNPs were also abundant inside the cells in clathrin-coated vesicles and endosomes. AuNPs were present but no longer paired in multivesicular bodies. FGF21 could thus be tracked along the endocytotic pathway. The methods developed here to visualize signaling coupled to endocytosis can be applied to a wide variety of cargo and may be extended to studies of other intracellular transactions.

Deciphering the Surface Composition and the Internal Structure of Alloyed Silver-Gold Nanoparticles

2018 ◽  
Vol 24 (36) ◽  
pp. 9051-9060 ◽  
Author(s):  
Viktoria Grasmik ◽  
Christian Rurainsky ◽  
Kateryna Loza ◽  
Mathies V. Evers ◽  
Oleg Prymak ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Internal Structure ◽  
Surface Composition

scholarly journals Versatile Phase Transfer Method for the Efficient Surface Functionalization of Gold Nanoparticles: Towards Controlled Nanoparticle Dispersion in a Polymer Matrix

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Katarzyna Ranoszek-Soliwoda ◽  
Maria Girleanu ◽  
Beata Tkacz-Szczęsna ◽  
Marcin Rosowski ◽  
Grzegorz Celichowski ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Polymer Matrix ◽  
Surface Functionalization ◽  
Transfer Process ◽  
Metallic Nanoparticles ◽  
Phase Transfer ◽  
Electron Tomography ◽  
Homogeneous Layer ◽  
Nanoparticle Dispersion ◽  
Vis Spectroscopy

In electronic devices based on hybrid materials such as nonvolatile memory elements (NVMEs), it is essential to control precisely the dispersion of metallic nanoparticles (NPs) in an insulating polymer matrix such as polystyrene in order to control the functionality of the device. In this work the incorporation of AuNPs in polystyrene films is controlled by tuning the surface functionalization of the metallic nanoparticles via ligand exchange. Two ligands with different structures were used for functionalization: 1-decanethiol and thiol-terminated polystyrene. This paper presents a versatile method for the modification of gold nanoparticles (AuNPs) with thiol-terminated polystyrene ligands via phase transfer process. An organic colloid of AuNPs (5±1 nm diameter) is obtained by the phase transfer process (from water to toluene) that allows exchanging the ligand adsorbed on AuNPs surface (hydrophilic citrate/tannic acid to hydrophobic thiols). The stability, size distribution, and precise location of modified AuNPs in the polymer matrix are obtained from UV-Vis spectroscopy, dynamic light scattering (DLS), and electron tomography. TEM tomographic 3D imaging demonstrates that the modification of AuNPs with thiol-terminated polystyrene results in homogeneous particle distribution in the polystyrene matrix compared to 1-decanethiol modified AuNPs for which a vertical phase separation with a homogeneous layer of AuNPs located at the bottom of the polymer matrix was observed.

The structure and morphology of gold nanoparticles produced in cationic gemini surfactant systems

2013 ◽  
Vol 93 ◽  
pp. 160-167 ◽  
Author(s):  
Magdalena Murawska ◽  
Michalina Wiatr ◽  
Paweł Nowakowski ◽  
Kosma Szutkowski ◽  
Andrzej Skrzypczak ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gemini Surfactant ◽  
Cationic Gemini Surfactant ◽  
Structure And Morphology ◽  
Surfactant Systems

The Internal Structure of Macroporous Membranes and Transport of Surface-Modified Nanoparticles

2015 ◽  
Vol 21 (4) ◽  
pp. 936-945 ◽  
Author(s):  
Sang J. Lee ◽  
Kiwoong Kim ◽  
Sungsook Ahn
Keyword(s):  
Gold Nanoparticles ◽  
Internal Structure ◽  
Morphological Structure ◽  
Improve Performance ◽  
X Ray ◽  
X Ray Scattering ◽  
Cellulose Acetate Membranes ◽  
Surface Modified ◽  
Surface Modified Nanoparticles

AbstractUnderstanding the morphological structure of membranes is essential to improve performance of membrane-based applications. In this paper, macroporous membranes were investigated and two methods introduced as an alternative for characterization of stereo-structure of the membranes. We combined the use of synchrotron X-ray nanotomography and small-angle X-ray scattering to examine the internal structure of cellulose acetate membranes with studies of the capture of surface-modified gold nanoparticles within these membranes. Finally, the morphological structures of macroporous membranes were visualized and their relationships with penetration tendency of surface-modified gold nanoparticles were explained.

scholarly journals Janus gold nanoparticles obtained via spontaneous binary polymer shell segregation

2016 ◽  
Vol 52 (23) ◽  
pp. 4278-4281 ◽  
Author(s):  
Ana M. Percebom ◽  
Juan J. Giner-Casares ◽  
Nathalie Claes ◽  
Sara Bals ◽  
Watson Loh ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Electron Tomography ◽  
Polymer Shell ◽  
Spontaneous Formation ◽  
Binary Polymer

The spontaneous formation of a Janus polymer shell is clearly demonstrated by electron tomography and NOESY-NMR.

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