Before striking gold in gold-ruby glass

Wagner, F. E.; Haslbeck, S.; Stievano, Lorenzo; Calogero, Sandro; Pankhurst, Quentin A.; Martinek, Klaus-Peter

doi:10.1038/35037661

Cited by 163 publications

(106 citation statements)

References 8 publications

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“…They are generally synthesized chemically using sodium borohydride, sodium citrate or, more recently, hydroquinone reduction of a chloroauric acid (HAuCl 4 ) solution [10][11][12][13][14][15][16]. The ratio of gold salt to reducing agent, type of reducing agent, and temperature play a critical role in determining the size and shape of the nanoparticles [17,18].…”

Section: Introductionmentioning

confidence: 99%

Polyethylene glycol functionalized gold nanoparticles: the influence of capping density on stability in various media

et al. 2011

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Thiol-terminated polyethylene glycol (PEG) is commonly used to functionalize the surface of gold nanoparticles (AuNPs) in order to improve their in vivo stability and to avoid uptake by the reticular endothelial system. Although it has been reported that AuNPs functionalized with tethered PEG are stable in biological media, the influence of chain density remains unclear. This study investigates the influence of PEG capping density on the stability of washed and dried AuNPs in: water, phosphate-buffered saline solution (PBS), phosphate-buffered saline solution containing bovine serum albumin (PBS/BSA), and dichloromethane (DCM). PEG coating had a dramatic effect on stability enabling stable suspensions to be produced in all the media studied. A linear relationship was observed between capping density and stability in water and DCM with a somewhat lower stability observed in PBS and PBS/BSA. A maximum PEG loading level of ∼14 wt.% was achieved, equivalent to a PEG surface density of ∼1.13 chains/nm 2 .

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Section: Introductionmentioning

confidence: 99%

Polyethylene glycol functionalized gold nanoparticles: the influence of capping density on stability in various media

et al. 2011

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“…9 Um dos exemplos mais conhecidos é a Taça de Lycurgus (século 4 d.C), que tem em sua composição nanopartículas de ouro (NPAu). 10 No entanto, foi somente em 1857 que as NPs-M receberam maior atenção devido aos estudos de Michael Faraday sobre o efeito da interação da luz em uma solução coloidal de NPAu obtida através da redução do cloreto de ouro pelo fósforo. 11,12 Deste então, o interesse nestas NPs tem aumentado e novas metodologias de síntese e caracterização têm sido desenvolvidas, possibilitando grande controle de tamanho e formato.…”

Section: Introductionunclassified

Ressonância de plasmon de superfície localizado e aplicação em biossensores e células solares

Santos¹,

Santos²,

Thesing³

et al. 2016

Quim. Nova

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LOCALIZED SURFACE PLASMON RESSONANCE APPLIED TO BIOSENSORS AND SOLAR CELLS. Within the last decades, the research on nanoparticles presenting localized surface plasmon resonance has increased constantly. In these materials, the interaction between electrons and incident light results in charge separation, enhancement of the electromagnetic field on the nanoparticles surface and in unique optical properties. Although many metals such as gold, silver, copper and aluminum present localized surface plasmon resonance within the visible range, gold and silver are the most commonly studied metals, due to the chemical inertia of gold and intense plasmon resonance from silver. In this review, we provide a description of the origin of localized surface plasmon resonance through the works developed by Mie, Maxwell and Maxwell-Garnett and a description of many examples of application of plasmonic nanoparticles on biosensors and solar cells, detailing the contribution of these plasmonic nanoparticles on the performance of these devices.Keywords: LSPR; Localized Surface Plasmon Resonance; biosensor; solar cell. INTRODUÇÃONos últimos 20 anos o interesse por nanopartículas metálicas (NPs-M) tem aumentado constantemente devido a sua ampla variedade de aplicações.1-8 Vários grupos de pesquisa têm estudado desde nanopartículas isoladas de cerca de 1 nm até nanopartículas de centenas de nanômetros, assim como seus aglomerados, buscando entender seu comportamento óptico e catalítico. Adicionalmente, a literatura descreve a constante busca por metodologias de síntese cada vez mais simples, de baixo custo e com alta reprodutibilidade. O comportamento óptico de nanopartículas metálicas tem fascinado a humanidade há vários séculos através de obras de arte, mesmo antes que a palavra nanotecnologia fosse utilizada.9 Um dos exemplos mais conhecidos é a Taça de Lycurgus (século 4 d.C), que tem em sua composição nanopartículas de ouro (NPAu).10 No entanto, foi somente em 1857 que as NPs-M receberam maior atenção devido aos estudos de Michael Faraday sobre o efeito da interação da luz em uma solução coloidal de NPAu obtida através da redução do cloreto de ouro pelo fósforo.11,12 Deste então, o interesse nestas NPs tem aumentado e novas metodologias de síntese e caracterização têm sido desenvolvidas, possibilitando grande controle de tamanho e formato.13-15 A pesquisa nesta área foi enriquecida pela compreensão do efeito da ressonância de plasmon de superfície localizado (LSPR), que explica o comportamento óptico destes materiais. Mie foi o primeiro a elucidar a origem das cores nestas estruturas e sua teoria foi posteriormente complementada com os modelos de Maxwell-Garnett que explicavam a interação de NPs-M com o meio. Estes estudos proporcionaram uma ampla visão quanto as possíveis aplicações das NPs-M, sendo atualmente empregada no desenvolvimento de novos materiais como células solares, biossensores e catalisadores. Nesta revisão, serão abordados os embasamentos teóricos envolvidos no efeito LSPR de NPs-M, destacando a aplicação destas n...

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“…Also, the presence of gold NPs is responsible for the color of some ancient glass handiworks, the most famous being probably the Lycurgus cup (dating back to the fifth century B.C. ), which appears green or red in reflection or transmission, respectively (Barber & Freestone, 1990;Wagner et al, 2000). Nanomaterials are characterized by having at least one dimension ranging from about 1 nm to 100 nm, although the upper limit of 100 nm is used by general consensus without any scientific evidence to support a disappearance of nano-properties above this value and some have suggested to consider nanotechnology-derived products also materials exhibiting properties or phenomena (including biological effects) that are attributable to their dimensions, even if the latter fall outside the nanoscale range, up to 1 micron (Tinkle et al, 2014).…”

Section: Properties Of Nanomaterialsmentioning

confidence: 99%

Scientific basis of nanotechnology, implications for the food sector and future trends

Rossi

Cubadda

Dini

et al. 2014

Trends in Food Science & Technology

119

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Nanotechnologies are opening up new horizons in almost all scientific and technological fields. Among these, applications of nanotechnologies are expected to bring large benefits and add value to the food and food-related industries through the whole food chain, from production to processing, safety, packaging, transportation, storage and delivery. Nanotechnology consists in the realization and manipulation of nano-sized matter, the unique properties of which with respect to their bulk counterparts are illustrated and discussed. Then, the main tools and techniques routinely used in nanotechnology for the nanoscale characterization of food matrices as well as for the analytical determination of nanomaterials in food samples are reviewed. Finally, safety and risk assessment issues are discussed and an overview of applications of nanotechnology to the food sector is provided along with a description of the current regulatory framework.

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Before striking gold in gold-ruby glass

Cited by 163 publications

References 8 publications

Polyethylene glycol functionalized gold nanoparticles: the influence of capping density on stability in various media

Polyethylene glycol functionalized gold nanoparticles: the influence of capping density on stability in various media

Ressonância de plasmon de superfície localizado e aplicação em biossensores e células solares

Scientific basis of nanotechnology, implications for the food sector and future trends

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