Determination of nanoparticle size using Rayleigh approximation and Mie theory

Niskanen, Ilpo; Forsberg, Viviane; Zakrisson, Daniel; Reza, Salim; Hummelgård, Magnus; Andres, Britta; Fedorov, Igor; Suopajärvi, Terhi; Liimatainen, Henrikki; Thungström, Göran

doi:10.1016/j.ces.2019.02.020

Cited by 36 publications

(21 citation statements)

References 32 publications

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“…The Mie scattering theory gives an exact solution for the particle size with spherical, isotropic and homogeneous particles. Such a theory is useful in applications when the wavelength is comparable to the particle diameter and scattering is dominated by a single-scattering process in the liquid [38]. Plasmon resonance of metal NPs may be used in surface enhanced Raman scattering (SERS), mostly for spectroscopic characterization of biological and catalytic materials [39].…”

Section: Optical Propertiesmentioning

confidence: 99%

Methods of Gold and Silver Nanoparticles Preparation

et al. 2019

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The versatile family of nanoparticles is considered to have a huge impact on the different fields of materials research, mostly nanoelectronics, catalytic chemistry and in study of cytocompatibility, targeted drug delivery and tissue engineering. Different approaches for nanoparticle preparation have been developed, not only based on “bottom up” and “top down” techniques, but also several procedures of effective nanoparticle modifications have been successfully used. This paper is focused on different techniques of nanoparticles’ preparation, with primary focus on metal nanoparticles. Dispergation methods such as laser ablation and vacuum sputtering are introduced. Condensation methods such as reduction with sodium citrate, the Brust–Schiffrin method and approaches based on ultraviolet light or biosynthesis of silver and gold are also discussed. Basic properties of colloidal solutions are described. Also a historical overview of nanoparticles are briefly introduced together with short introduction to specific properties of nanoparticles and their solutions.

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Section: Optical Propertiesmentioning

confidence: 99%

Methods of Gold and Silver Nanoparticles Preparation

et al. 2019

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“…The absorbance decreased with increasing particle size (Figure 2b), as expected, according to Mie theory. [ 35 ] The coarse SrFe 12 O 19 particle (6–12 µm) showed the lowest absorbance, and the fine particle (2.4–3 µm) showed the highest absorbance among the three types of SrFe 12 O 19 particles. The sedimentation rate was measured by a modified Westergren method.…”

Section: Development Of Cvpmentioning

confidence: 99%

Magnetic Soft Millirobots 3D Printed by Circulating Vat Photopolymerization to Manipulate Droplets Containing Hazardous Agents for In Vitro Diagnostics

Zhou

Kanitthamniyom

et al. 2022

Advanced Materials

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3D printing via vat photopolymerization (VP) is a highly promising approach for fabricating magnetic soft millirobots (MSMRs) with accurate miniature 3D structures; however, magnetic filler materials added to resin either strongly interfere with the photon energy source or sediment too fast, resulting in the nonuniformity of the filler distribution or failed prints, which limits the application of VP. To this end, a circulating vat photopolymerization (CVP) platform that can print MSMRs with high uniformity, high particle loading, and strong magnetic response is presented. After extensive characterization of materials and 3D printed parts, it is found that SrFe12O19 is an ideal magnetic filler for CVP and can be printed with 30% particle loading and high uniformity. By using CVP, various tethered and untethered MSMRs are 3D printed monolithically and demonstrate the capability of reversible 3D‐to‐3D transformation and liquid droplet manipulation in 3D, an important task for in vitro diagnostics that are not shown with conventional MSMRs. A fully automated liquid droplet handling platform that manipulates droplets with MSMR is presented for detecting carbapenem antibiotic resistance in hazardous biosamples as a proof of concept, and the results agree with the benchmark.

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“…From the optical pictures, the red school badge covered by the coated glass can be clearly seen if the primer content was lowered to 4 wt.%. In order to fabricate the transparent superhydrophobic coating, considering the Mie and Rayleigh scattering theory [29][30][31], it is necessary to ensure that the surface roughness is less than or approximately equal to the light source wavelength based on the coating surface morphology features and roughness measurement; the primer content increases from 2 wt.% to 5 wt.%; the coating surface roughness (Sa) ranges from 155 nm to 940 nm; and when the primer content reaches 5 wt.%, the surface roughness value exceeds the visible spectrum range and the light can be scattered forwards and backwards (reflected), thus formatting a non-transparent surface. Based on the above analysis, the increase in the primer content will trigger the coating surface non-uniformization and increase the roughness, resulting in decreasing light transmittance.…”

Section: Wettability and Transparency Of Coatingmentioning

confidence: 99%

Preparation of Transparent Sandwich-like Superhydrophobic Coating on Glass with High Stability and Self-Cleaning Properties

Hang

Song

et al. 2022

Coatings

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High stability and transparent superhydrophobic coating on a glass substrate that can effectively repel the wetting dust as a self-cleaning property are beneficial traits for solving the decrease in optical lens clarity in an unmanned underground mining environment. However, the transparent superhydrophobic coating has still not been applied due to the contradiction between visibility, hydrophobicity and durability. Herein, a sandwich-like superhydrophobic coating was designed and prepared on borosilicate glass, which consisted of a micro/nanostructure body of neutral silicone sealant (primer) and hydrophobic silica nanoparticles (interlayer), as well as a protective layer of ultraviolet (UV) gel. The coated glass exhibited excellent superhydrophobicity towards many aqueous solutions, and had highly visible light transparency of 80% at 4 wt.% primer mass content. Furthermore, significant tests including the droplet impact, hot water boiling, stirring in acetic acid aqueous solution and sandpaper abrasion were performed on our superhydrophobic coating, which indicated that the obtained transparent coating had good stability and excellent mechanical durability. The coated glass also showed a more wonderful self-cleaning property compared with that of the original glass. This superhydrophobic coating on glass substrate, fabricated by a facile and cost-effective layer-by-layer construction approach, has great potential for general and practical application in the unmanned mining environment under multiple dust and atomized water conditions.

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Determination of nanoparticle size using Rayleigh approximation and Mie theory

Cited by 36 publications

References 32 publications

Methods of Gold and Silver Nanoparticles Preparation

Methods of Gold and Silver Nanoparticles Preparation

Magnetic Soft Millirobots 3D Printed by Circulating Vat Photopolymerization to Manipulate Droplets Containing Hazardous Agents for In Vitro Diagnostics

Preparation of Transparent Sandwich-like Superhydrophobic Coating on Glass with High Stability and Self-Cleaning Properties

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