Engineering microencapsulation of highly catalytic gold nanoclusters for an extreme thermal stability

Nanoscale ◽  
2015 ◽  
Vol 7 (48) ◽  
pp. 20584-20592 ◽  
Author(s):  
Ana Sousa-Castillo ◽  
Mathilde Gauthier ◽  
Raul Arenal ◽  
Moisés Pérez-Lorenzo ◽  
Miguel A. Correa-Duarte
Keyword(s):  
Thermal Stability ◽  
Gold Nanoparticles ◽  
Gold Nanoclusters ◽  
Synthetic Strategy

A synthetic strategy based on microencapsulation endows ultra-small gold nanoparticles with an outstanding thermal stability.

scholarly journals Gold nanoparticles increases UV and thermal stability of human serum albumin

2016 ◽  
Vol 11 (4) ◽  
pp. 04B310 ◽  
Author(s):  
Robin Capomaccio ◽  
Inês Osório ◽  
Isaac Ojea-Jiménez ◽  
Giacomo Ceccone ◽  
Pascal Colpo ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Gold Nanoparticles ◽  
Human Serum Albumin ◽  
Serum Albumin ◽  
Human Serum ◽  
Thermal Stability Of

scholarly journals Development of Bio-Functionalized, Raman Responsive, and Potentially Excretable Gold Nanoclusters

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2181
Author(s):  
Ryan D. Mellor ◽  
Andreas G. Schätzlein ◽  
Ijeoma F. Uchegbu
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Ethylene Glycol ◽  
Gold Nanoclusters ◽  
Physiological Conditions ◽  
Non Invasive ◽  
In Vivo Detection ◽  
Raman Response ◽  
Octadecyl Amine

Gold nanoparticles (AuNPs) are used experimentally for non-invasive in vivo Raman monitoring because they show a strong absorbance in the phototherapeutic window (650–850 nm), a feature that is accompanied by a particle size in excess of 100 nm. However, these AuNPs cannot be used clinically because they are likely to persist in mammalian systems and resist excretion. In this work, clustered ultrasmall (sub-5 nm) AuNP constructs for in vivo Raman diagnostic monitoring, which are also suitable for mammalian excretion, were synthesized and characterized. Sub-5 nm octadecyl amine (ODA)-coated AuNPs were clustered using a labile dithiol linker: ethylene glycol bis-mercaptoacetate (EGBMA). Upon clustering via a controlled reaction and finally coating with a polymeric amphiphile, a strong absorbance in the phototherapeutic window was demonstrated, thus showing the potential suitability of the construct for non-invasive in vivo detection and monitoring. The clusters, when labelled with a biphenyl-4-thiol (BPT) Raman tag, were shown to elicit a specific Raman response in plasma and to disaggregate back to sub-5 nm particles under physiological conditions (37 °C, 0.8 mM glutathione, pH 7.4). These data demonstrate the potential of these new AuNP clusters (Raman NanoTheranostics—RaNT) for in vivo applications while being in the excretable size window.

Gold nanoclusters reductively deposited on porous silicon: morphology and electronic structures

1998 ◽  
Vol 76 (11) ◽  
pp. 1707-1716 ◽  
Author(s):  
I Coulthard ◽  
S Degen ◽  
Y -J Zhu ◽  
T K Sham
Keyword(s):  
Gold Nanoparticles ◽  
Porous Silicon ◽  
Photoelectron Spectroscopy ◽  
Gold Nanoclusters ◽  
Gold Complex ◽  
X Ray Diffraction ◽  
Complex Ions ◽  
X Ray ◽  
Preparation Conditions ◽  
P Type

Utilizing porous silicon as a reducing agent and a substrate, gold complex ions [AuCl4]- were reduced from aqueous solution to produce nanoparticles of gold upon the surface of porous silicon. Scanning electron microscopy (SEM) was utilized to study the morphology of the porous silicon layers and the deposits of gold nanoparticles. It is found that preparation conditions have a profound effect on the morphology of the deposits, especially on porous silicon prepared from a p-type wafer. The gold nanoparticles, varying from micrometric aggregates of clusters of the order of 10 nm, to a distribution of nearly spherical clusters of the order of 10 nm, to strings of ~10 nm were observed and compared to bulk gold metal using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and X-ray absorption spectroscopy (XAS). These techniques confirm and complement the SEM findings. The potential for this reductive deposition technique is noted.Key words: gold nanostructures, reductive deposition, porous silicon, morphology, X-ray spectroscopy.

scholarly journals “Nanotraps” in porous electrospun fibers for effective removal of lead(ii) in water

2016 ◽  
Vol 4 (7) ◽  
pp. 2484-2493 ◽  
Author(s):  
Anitha Senthamizhan ◽  
Brabu Balusamy ◽  
Asli Celebioglu ◽  
Tamer Uyar
Keyword(s):  
Cellulose Acetate ◽  
Gold Nanoclusters ◽  
Electrospun Fibers ◽  
Synthetic Strategy ◽  
Effective Removal

In this report, we demonstrated a synthetic strategy for the effective removal of Pb2+in water by creating stable “nanotraps” in electrospun porous cellulose acetate fibers encapsulated with dithiothreitol capped gold nanoclusters.

Structure and thermal stability of gold nanoclusters: The Au38 case

1999 ◽  
pp. 211-215 ◽  
Author(s):  
I. L. Garzón ◽  
K. Michaelian ◽  
M. R. Beltrán ◽  
A. Posada-Amarillas ◽  
P. Ordejón ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Gold Nanoclusters ◽  
Thermal Stability Of

Colorimetric and fluorometric aggregation-based heparin assay by using gold nanoclusters and gold nanoparticles

2019 ◽  
Vol 186 (12) ◽  
Author(s):  
Zhipeng Zhang ◽  
Sha Li ◽  
Pengcheng Huang ◽  
Jiayu Feng ◽  
Fang-Ying Wu
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoclusters

Facile Solvothermal Preparation of Monodisperse Gold Nanoparticles and Their Engineered Assembly of Ferritin–Gold Nanoclusters

Langmuir ◽  
2013 ◽  
Vol 29 (50) ◽  
pp. 15698-15703 ◽  
Author(s):  
Jonghoon Choi ◽  
Sungwook Park ◽  
Zoran Stojanović ◽  
Hyung-Seop Han ◽  
Jongwook Lee ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoclusters ◽  
Solvothermal Preparation

Theoretical Investigation on the Thermal Stability of Hollow Gold Nanoparticles

2009 ◽  
Vol 113 (47) ◽  
pp. 20193-20197 ◽  
Author(s):  
Luyun Jiang ◽  
Xing Yin ◽  
Jianwei Zhao ◽  
Hongmei Liu ◽  
Yunhong Liu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Gold Nanoparticles ◽  
Theoretical Investigation ◽  
Hollow Gold Nanoparticles ◽  
Thermal Stability Of
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