Particle Sampling by TEM Grid Filtration

R’Mili, Badr; Bihan, Olivier Le; Dutouquet, Christophe; Aguerre-Charriol, O.; Fréjafon, Emeric

doi:10.1080/02786826.2013.789478

Cited by 73 publications

(50 citation statements)

References 32 publications

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“…66 Detailed information on the structure of the particles found on the fibers were obtained by small-and wideangle X-ray scattering (SAXS/WAXS). Non-invasive measurements were performed using a custom-made laboratory SAXS/WAXS camera with Cu-Kα radiation (λ = 1.54 Å), as described elsewhere.…”

Section: Surface Chemistry and Morphology Of The Nanofinished Textilementioning

confidence: 99%

Scalable and Environmentally Benign Process for Smart Textile Nanofinishing

Feng

Hontañón

Blanes

et al. 2016

ACS Appl. Mater. Interfaces

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A major challenge in nanotechnology is that of determining how to introduce green and sustainable principles when assembling individual nanoscale elements to create working devices.For instance, textile nanofinishing is restricted by the many constraints of traditional pad-drycure processes, such as the use of costly chemical procedures to produce nanoparticles (NPs), the high liquid and energy consumption, the production of harmful liquid waste, and multi-step batch operations. By integrating low-cost, scalable, and environmentally benign aerosol processes of the type proposed here into textile nanofinishing, these constraints can be circumvented while leading to a new class of fabrics. The proposed one-step textile nanofinishing process relies on the diffusional deposition of aerosol NPs onto textile fibers. As proof of this concept, we deposit Ag NPs onto a range of textiles and assess their antimicrobial properties for two strains of bacteria (i.e., Staphylococcus Aureus and Klebsiella Pneumoniae).The measurements show that the logarithmic reduction in bacterial count reaches ca. 5.5 (corresponding to a reduction efficiency of 99.96%) when the Ag loading is one order of magnitude less (10 ppm; i.e., 10 mg Ag NPs per kg of textile) than in the textiles treated by traditional wet-routes. The antimicrobial activity does not increase in proportion to the Ag content above 10 ppm as a consequence of a "saturation" effect. Such low loading for

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Section: Surface Chemistry and Morphology Of The Nanofinished Textilementioning

confidence: 99%

Scalable and Environmentally Benign Process for Smart Textile Nanofinishing

Feng

Hontañón

Blanes

et al. 2016

ACS Appl. Mater. Interfaces

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“…To verify our assumption 1) in the main manuscript and compare the volume of initial vapor cloud to the model, we collected NPs close to the spark by a Mini-Particle Sampler (MPS), 12 which carries a TEM grid with holes, through which the aerosol flow passes. Particle collection can thus be described as a filtration process.…”

Section: Section S6 Proximity Collection Of the Early Stage Clustersmentioning

confidence: 99%

General Approach to the Evolution of Singlet Nanoparticles from a Rapidly Quenched Point Source

et al. 2015

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Among the numerous point vapor sources, microsecond-pulsed spark ablation at atmospheric pressure is a versatile and environmentally friendly method for producing ultrapure inorganic nanoparticles ranging from singlets having sizes smaller than 1 nm to larger agglomerated structures. Due to its fast quenching and extremely high supersaturation, coagulational growth already begins at the atomic scale at room temperature. On the basis of this knowledge, we develop a simple semiempirical yet versatile model for predicting the size distribution of singlet particles as a function of the process conditions. The model assumes that a plume of a turbulent aerosol flow flares out from a concentrated point source, eventually reaching the walls of the confinement where a fraction of the particles is deposited. Despite the complexity of the entire process, the concentration and size evolution of particles can be adequately described by a first-order differential equation accounting for coagulation, turbulent dilution, and diffusional deposition to the walls. The model provides a simple and practical tool that can generally be used to design and control point vapor source reactors for the synthesis of singlets with tunable sizes starting from that of single atoms.

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“…The thin film on the grid may be damaged if the flow rate is too high. Detailed information on the use of the sampler is available 21 . Typically, the sampling process lasts for about 3 min.…”

Section: Characterizationmentioning

confidence: 99%

A System to Create Stable Nanoparticle Aerosols from Nanopowders

Ding

Riediker

2016

JoVE

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Nanoparticle aerosols released from nanopowders in workplaces are associated with human exposure and health risks. We developed a novel system, requiring minimal amounts of test materials (min. 200 mg), for studying powder aerosolization behavior and aerosol properties. The aerosolization procedure follows the concept of the fluidized-bed process, but occurs in the modified volume of a V-shaped aerosol generator. The airborne particle number concentration is adjustable by controlling the air flow rate. The system supplied stable aerosol generation rates and particle size distributions over long periods (0.5-2 hr and possibly longer), which are important, for example, to study aerosol behavior, but also for toxicological studies. Strict adherence to the operating procedures during the aerosolization experiments ensures the generation of reproducible test results. The critical steps in the standard protocol are the preparation of the material and setup, and the aerosolization operations themselves. The system can be used for experiments requiring stable aerosol concentrations and may also be an alternative method for testing dustiness. The controlled aerosolization made possible with this setup occurs using energy inputs (may be characterized by aerosolization air velocity) that are within the ranges commonly found in occupational environments where nanomaterial powders are handled. This setup and its operating protocol are thus helpful for human exposure and risk assessment.

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Particle Sampling by TEM Grid Filtration

Cited by 73 publications

References 32 publications

Scalable and Environmentally Benign Process for Smart Textile Nanofinishing

Scalable and Environmentally Benign Process for Smart Textile Nanofinishing

General Approach to the Evolution of Singlet Nanoparticles from a Rapidly Quenched Point Source

A System to Create Stable Nanoparticle Aerosols from Nanopowders

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