A flexible lab-on-a-chip for the synthesis and magnetic separation of magnetite decorated with gold nanoparticles

Lab on a Chip ◽  
2015 ◽  
Vol 15 (8) ◽  
pp. 1835-1841 ◽  
Author(s):  
Flávio C. Cabrera ◽  
Antonio F. A. A. Melo ◽  
João C. P. de Souza ◽  
Aldo E. Job ◽  
Frank N. Crespilho
Keyword(s):  
Heat Treatment ◽  
Gold Nanoparticles ◽  
Natural Rubber ◽  
Magnetic Separation ◽  
Organic Solvents ◽  
Microfluidic Device ◽  
Magnetite Nanoparticles ◽  
Lab On A Chip

The preparation of controlled amounts of magnetite nanoparticles decorated with gold nanoparticles without organic solvents, surfactants, or heat treatment is presented. For this, natural-rubber-based microfluidic device (NRMD) was used as a flexible lab-on-a-chip.

Effect of Heat Treatment Conditions on the Properties of Nanoporous Glasses Activated by Gold Nanoparticles

2021 ◽  
Author(s):  
G. Yu. Shakhgil’dyan ◽  
A. A. Mikhailov ◽  
T. O. Lipat’eva ◽  
K. I. Piyanzina ◽  
E. A. Kolesnikov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Gold Nanoparticles ◽  
Treatment Conditions

A microfluidic device based on a screen-printed carbon electrode with electrodeposited gold nanoparticles for the detection of IgG anti-Trypanosoma cruzi antibodies

The Analyst ◽  
2011 ◽  
Vol 136 (22) ◽  
pp. 4745 ◽  
Author(s):  
Sirley V. Pereira ◽  
Franco A. Bertolino ◽  
Martín A. Fernández-Baldo ◽  
Germán A. Messina ◽  
Eloy Salinas ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Trypanosoma Cruzi ◽  
Microfluidic Device ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Electrodeposited Gold Nanoparticles ◽  
Screen Printed

Ultrafast Laser Processing for Lab-on-a-Chip Device Manufacture

2004 ◽  
Vol 850 ◽  
Author(s):  
Koji Sugioka ◽  
Ya Cheng ◽  
Katsumi Midorikawa
Keyword(s):  
Heat Treatment ◽  
Laser Processing ◽  
Lab On A Chip ◽  
Ultrafast Laser ◽  
Wet Etching ◽  
Direct Write ◽  
Electric Control ◽  
Fs Laser ◽  
Laser Direct Write ◽  
Hollow Microstructures

ABSTRACT3D microstructuring of photosensitive glass is demonstrated by femtosecond (fs) laser for lab-on-a-chip manufacture. True 3D hollow microstructures embedded in the glass are fabricated by the fs laser direct write followed by heat treatment and successive wet etching. A variety of microcomponents for a lab-on-a-chip device like a microfluidics, a microvalve, a microoptics, a microlaser, etc. are fabricated by using this technique. The fs laser direct write process is also applied for selective metallization of internal walls of the hollow microstructures embedded in the glass for electric control of movement of the micromechanical components in the lab-on-a-chip device.

Characterization of Plutonium Contaminated Soils From the Nevada Test Site for Remediation Method Selection

2003 ◽  
Author(s):  
Guilhermina Torrao ◽  
Robert Carlino ◽  
Steve L. Hoeffner ◽  
James D. Navratil
Keyword(s):  
Heat Treatment ◽  
Magnetic Separation ◽  
Contaminated Soil ◽  
Manganese Oxides ◽  
Test Site ◽  
Magnetic Fraction ◽  
Nevada Test Site ◽  
Size Separation ◽  
Stable Elements ◽  
Remediation Process

Plutonium (239/240Pu) contamination in soils is an environmental concern at many U.S. Department of Energy (DOE) sites. Remediation actions have been attempted using different technologies, and clean-up plans have been implemented at several sites, such as the Nevada Test Site (NTS). During the 1950’s and early 1960’s, nuclear weapons testing at and near the NTS resulted in soil contaminated with plutonium particles. Clean-up efforts are continuing using conventional remediation techniques. However, the DOE desires to obtain technologies that can further reduce risks, reduce clean-up costs, and reduce the volume of contaminated soil for disposal. Low levels of plutonium contamination are distributed somewhat uniformly throughout the NTS soils and, as a result, it is difficult to obtain volume reductions above 70%. The subject of this research was to characterize the plutonium-contaminated soil from the Tonopah Test Range (TTR) north of the NTS. In order to select remediation methods, it is important to gain a better understanding of how plutonium is bound to the contaminated soil; thus, size separation, magnetic separation, and the sequential extraction (SE) methods were used for this purpose. The SE method consisted of targeting five operationally defined geochemical phases: ion exchangeable, bound to carbonates, bound to iron and manganese oxides (reducible), bound to organic matter, and resistant. Radiometric measurements were used to determine plutonium in each of these defined phases in the soil. Selected stable elements were also determined, to compare the operation of the SE method to other investigators. The SE experiments were performed with two types of samples: soil without heat treatment and soil with heat treatment. The MF treatment was used to destroy the organic content in the soil so as to further evaluate the SE procedure. Particle size analysis indicated that approximately 37% of the TTR soil by weight was larger than 300 micrometers and this fraction contained little plutonium, < 100 pCi/g. Thus, size separation may be useful as part of a remediation process. Magnetic separation tests showed that the magnetic fraction of the TTR soils is very small, and the non-magnetic fraction still contained the majority of the plutonium. Thus, a magnetic separation step in a treatment process would not be useful. Following SE, analysis results of the stable elements agreed with reported values. The SE results also indicated an association of plutonium with the organic and resistant defined phases. The main change in 239/240Pu distribution following heat treatment was an increase of plutonium recovery in the reducible phase. The SE results showed that fairly aggressive chemical treatment would be required if leaching were part of a remediation process.

Laser-controlled precipitation of gold nanoparticles in silicate glasses

2003 ◽  
Vol 18 (9) ◽  
pp. 2097-2100 ◽  
Author(s):  
Xiongwei Jiang ◽  
Jianrong Qiu ◽  
Huidan Zeng ◽  
Congshan Zhu
Keyword(s):  
Heat Treatment ◽  
Gold Nanoparticles ◽  
Femtosecond Laser ◽  
Optical Switches ◽  
Sample Heat ◽  
Selective Precipitation ◽  
Heat Treated ◽  
All Optical ◽  
Potential Applications ◽  
Controlled Precipitation

We report on the observation of space-selective precipitation of gold nanoparticles in Au2O-doped silicate glass by a method of irradiation with an 800-nm femtosecond laser and further heat treatment. The irradiated region of the glass first became gray in color after irradiation with the femtosecond laser and then turned red after further heat treatment at around 520 °C, indicating that gold nanoparticles have precipitated in the irradiated region of the glass. A possible mechanism has been suggested that the Au+ ions in the region irradiated are reduced to Au0 atoms by the femtosecond laser, and then the Au0 atoms accumulate to form gold nanoparticles with the glass sample heat treated. The observed phenomenon should have potential applications in the fabrication of ultrafast all-optical switches.

Characterization of natural rubber/gold nanoparticles SERS-active substrate

2013 ◽  
Vol 130 (1) ◽  
pp. 186-192 ◽  
Author(s):  
Flávio C. Cabrera ◽  
Deuber L. S. Agostini ◽  
Renivaldo J. dos Santos ◽  
Silvio R. Teixeira ◽  
Miguel A. Rodríguez-Pérez ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Natural Rubber ◽  
Active Substrate ◽  
Sers Active Substrate
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