scholarly journals Glowing gold nanoparticle coating: restoring the lost property from bulk gold

Nanoscale ◽  
2019 ◽  
Vol 11 (9) ◽  
pp. 3786-3793 ◽  
Author(s):  
Yukari Kawabe ◽  
Takashi Ito ◽  
Hiroaki Yoshida ◽  
Hiroshi Moriwaki
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Nanoparticle Coating ◽  
Pencil Drawing ◽  
Bulk Gold ◽  
Cellulose Filter

Gold nanoparticles deposited on a cellulose filter with pencil drawing appear golden in color.

Laser Curing of Gold Nanoparticle Inks

2003 ◽  
Author(s):  
Jaewon Chung ◽  
Seunghwan Ko ◽  
Nicole R. Bieri ◽  
Costas P. Grigoropoulos ◽  
Dimos Poulikakos
Keyword(s):  
Gold Nanoparticles ◽  
Laser Beam ◽  
Gold Nanoparticle ◽  
Glass Substrate ◽  
Processing Scheme ◽  
Drop On Demand ◽  
Nanoparticle Suspensions ◽  
Laser Curing ◽  
First Time ◽  
Bulk Gold

The concept of effective laser curing of nanoparticle suspensions (NPS) with a laser beam is presented in this paper. A toluene solvent is employed as the carrier of gold nanoparticles possessing a lower melting temperature than that of bulk gold. Using a modified drop-on-demand jetting system, the gold nanoparticle suspended solution is printed on a glass substrate and cured with laser irradiation. The laser energy coupling to the nanoparticles in conjunction with thermocapillary effects and the evaporation of the solvent are critical to the quality of the electrically conductive gold microlines. By employing a intensity-modulated double laser beam processing scheme, to optimize the curing process, it is demonstrated for the first time, that the gold nanoparticles could be sintered on a glass substrate to form a gold line of resistivity close to that of bulk gold. This is a noticeable result, compared to recently published microconductor manufacturing with nanoparticle suspensions with oven [1] or low power single laser beam [2] curing reporting resistivities four to five times higher than that of bulk gold. As a consequence, in addition to their scientific value, the current results demonstrate the potential of laser printing for use in the microelectronics manufacturing for the first time. It was also shown that the morphology of the gold line could be modified by appropriate design of the shape of the processing laser beam.

Interference of Gold Nanoparticles with In vitro Endotoxin Detection Assays

2020 ◽  
Vol 16 (2) ◽  
pp. 204-213 ◽  
Author(s):  
Melissa A. Vetten ◽  
Mary Gulumian
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Surface Reactivity ◽  
In Vitro Assays ◽  
Limulus Amebocyte Lysate ◽  
Chromogenic Assay ◽  
Nanoparticle Suspensions ◽  
Endotoxin Contamination ◽  
Factor C

Background: Endotoxin-free engineered nanoparticle suspensions are imperative for their successful applications in the field of nanomedicine as well as in the investigations in their toxicity. Gold nanoparticles are known to interfere with various in vitro assays due to their optical properties and potential for surface reactivity. In vitro endotoxin testing assays are known to be susceptible to interference caused by the sample being tested. Objective: This study aimed to identify a preferred assay for the testing of endotoxin contamination in gold nanoparticle suspensions. Methods: The interference by gold nanoparticles on three assays namely, the commonly used limulus amebocyte lysate chromogenic assay, the limulus amebocyte lysate gel-clot method, and the less common recombinant Factor C (rFC) assay, was tested. Results: Possible interference could be observed with all three assays. The interference with the absorbance- based chromogenic assay could not be overcome by dilution; whilst the qualitative nature of the gel-clot assay excluded the possibility of distinguishing between a false positive result due to enhancement of the sensitivity of the assay, and genuine endotoxin contamination. However, interference with the rFC assay was easily overcome through dilution. Conclusion: The rFC assay is recommended as an option for endotoxin contamination detection in gold nanoparticle suspensions.

scholarly journals CRISPR/Cas12a-mediated gold nanoparticle aggregation for colorimetric detection of SARS-CoV-2

2021 ◽  
Author(s):  
Yiren Cao ◽  
Jinjun Wu ◽  
Bo Pang ◽  
Hongquan Zhang ◽  
X. Chris Le
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Colorimetric Detection ◽  
Isothermal Amplification ◽  
Nanoparticle Aggregation ◽  
Cleavage Activity ◽  
Gold Nanoparticle Aggregation

The trans-cleavage activity of the target-activated CRISPR-Cas12a liberated an RNA crosslinker from a molecular transducer, which facilitated assembly of gold nanoparticles. Integration of the molecular transducer with isothermal amplification and...

Fluorescence biosensor for Salmonella typhimurium detection in food based on nano-self-assembly of alendronic acid modified upconversion and gold nanoparticles

2021 ◽  
Author(s):  
Min Chen ◽  
Leiqing Pan ◽  
K. Tu
Keyword(s):  
Gold Nanoparticles ◽  
Salmonella Typhimurium ◽  
Gold Nanoparticle ◽  
Alendronic Acid ◽  
Self Assembly ◽  
Upconversion Nanoparticles ◽  
Fluorescent Biosensor ◽  
Fluorescence Biosensor

A simple and quick responsive fluorescent biosensor for Salmonella typhimurium detection based on the recognition of aptamer coupled with alendronic acid (ADA)@upconversion nanoparticles (UCNPs) and gold nanoparticle (AuNPs) has been...

Hydrophobic collapse-driven nanoparticle coating with poly-adenine adhesives

2021 ◽  
Vol 57 (31) ◽  
pp. 3801-3804
Author(s):  
Dan Zhu ◽  
Jiang Li ◽  
Lianhui Wang ◽  
Qian Li ◽  
Lihua Wang ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Nanoparticle Coating ◽  
Hydrophobic Collapse ◽  
High Affinity ◽  
Strong Adhesion

Poly-adenine DNA shows strong adhesion to gold nanoparticles with high affinity via hydrophobic collapse.

scholarly journals Enhanced Extracellular Synthesis of Gold Nanoparticles by Soluble Extracts from Escherichia coli Transformed with Rhizobium tropici Phytochelatin Synthase Gene

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 472
Author(s):  
Qunying Yuan ◽  
Manjula Bomma ◽  
Zhigang Xiao
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Synthesis Method ◽  
Nanoparticle Synthesis ◽  
Morphological Properties ◽  
Phytochelatin Synthase ◽  
Rhizobium Tropici ◽  
Whole Cells ◽  
E Coli ◽  
Recombinant Cells

Phytochelatins, the enzymatic products of phytochelatin synthase, play a principal role in protecting the plants from heavy metal and metalloid toxicity due to their ability to scavenge metal ions. In the present study, we investigated the capacity of soluble intracellular extracts from E. coli cells expressing R. tropici phytochelatin synthase to synthesize gold nanoparticle. We discovered that the reaction mediated by soluble extracts from the recombinant E. coli cells had a higher yield of gold nanoparticles, compared to that from the control cells. The compositional and morphological properties of the gold nanoparticles synthesized by the intracellular extracts from recombinant cells and control cells were similar. In addition, this extracellular nanoparticle synthesis method produced purer gold nanoparticles, avoiding the isolation of nanoparticles from cellular debris when whole cells are used to synthesize nanoparticles. Our results suggested that phytochelatins can improve the efficiency of gold nanoparticle synthesis mediated by bacterial soluble intracellular extracts, and the potential of extracellular nanoparticle synthesis platform for the production of nanoparticles in large quantity and pure form is worth further investigation.

scholarly journals Enhanced enzymatic activity from phosphotriesterase trimer gold nanoparticle bioconjugates for pesticide detection

The Analyst ◽  
2017 ◽  
Vol 142 (17) ◽  
pp. 3261-3271 ◽  
Author(s):  
John A. Hondred ◽  
Joyce C. Breger ◽  
Nate T. Garland ◽  
Eunkeu Oh ◽  
Kimihiro Susumu ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Enzymatic Activity ◽  
Gold Nanoparticle ◽  
Pesticide Detection

A significant enzymatic enhancement of phosphotriesterase has been demonstrated when immobilized on various sized gold nanoparticles.

Electrodeposition of gold nanoparticles on aryl diazonium monolayer functionalized HOPG surfaces

2016 ◽  
Vol 18 (3) ◽  
pp. 1953-1960 ◽  
Author(s):  
M. C. R. González ◽  
A. G. Orive ◽  
R. C. Salvarezza ◽  
A. H. Creus
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Organic Film

Gold nanoparticle electrodeposition on a modified HOPG surface with a monolayer organic film based on aryl diazonium chemistry has been studied.

scholarly journals Influence of the glycocalyx and plasma membrane composition on amphiphilic gold nanoparticle association with erythrocytes

Nanoscale ◽  
2015 ◽  
Vol 7 (26) ◽  
pp. 11420-11432 ◽  
Author(s):  
Prabhani U. Atukorale ◽  
Yu-Sang Yang ◽  
Ahmet Bekdemir ◽  
Randy P. Carney ◽  
Paulo J. Silva ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Plasma Membrane ◽  
Gold Nanoparticle ◽  
Erythrocyte Membranes ◽  
Membrane Composition ◽  
Membrane Components

Amphiphilic gold nanoparticles spontaneously insert into erythrocyte membranes; we characterize this association as a function of key plasma membrane components.

scholarly journals Application of Gold-Nanoparticle Colorimetric Sensing to Rapid Food Safety Screening

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4166 ◽  
Author(s):  
Guangyang Liu ◽  
Meng Lu ◽  
Xiaodong Huang ◽  
Tengfei Li ◽  
Donghui Xu
Keyword(s):  
Gold Nanoparticles ◽  
Gold Nanoparticle ◽  
Rapid Testing ◽  
Colorimetric Sensing ◽  
Preparation Methods ◽  
Particle Spacing ◽  
Advantages And Disadvantages ◽  
Site Monitoring ◽  
Biological Affinity ◽  
Food Quality And Safety

Due to their unique optical properties, narrow size distributions, and good biological affinity, gold nanoparticles have been widely applied in sensing analysis, catalytic, environmental monitoring, and disease therapy. The color of a gold nanoparticle solution and its maximum characteristic absorption wavelength will change with the particle size and inter-particle spacing. These properties are often used in the detection of hazardous chemicals, such as pesticide residues, heavy metals, banned additives, and biotoxins, in food. Because the gold nanoparticles-colorimetric sensing strategy is simple, quick, and sensitive, this method has extensive applications in real-time on-site monitoring and rapid testing of food quality and safety. Herein, we review the preparation methods, functional modification, photochemical properties, and applications of gold nanoparticle sensors in rapid testing. In addition, we elaborate on the colorimetric sensing mechanisms. Finally, we discuss the advantages and disadvantages of colorimetric sensors based on gold nanoparticles, and directions for future development.

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