Evaluation of Silica Nanoparticle Colloidal Stability With a Fiber Optic Quasi-Elastic Light Scattering Sensor

Soares, Marco César Prado; Gomes, Mogar Dreon; Schenkel, Egont Alexandre; Rodrigues, Matheus dos Santos; Suzuki, Carlos Kenichi; Torre, Lucimara Gaziola de la; Fujiwara, Eric

doi:10.1590/0104-6632.20190364s20190042

Cited by 9 publications

(7 citation statements)

References 32 publications

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“…Quantitative techniques and models of the dispersed medium studies were considered in this research. − ,, …”

Section: Experimental Section and Computational Methodsmentioning

confidence: 99%

“…Different techniques and models are used for the quantitative characterization of dispersed media. 6 − 16 New technological conditions are promising for increased target product output. Characteristics of the natural and artificial organic chemistry products depend on both the properties of production medium and the medium of organic matter application.…”

Section: Introductionmentioning

confidence: 99%

“…Recognition (identification) of dispersed media and organic matter by their scattering matrices is of great fundamental and applied importance. − Studies on dispersed media are linked to the new technologies of production of artificial mineral and organic matter. Different techniques and models are used for the quantitative characterization of dispersed media. − New technological conditions are promising for increased target product output. Characteristics of the natural and artificial organic chemistry products depend on both the properties of production medium and the medium of organic matter application.…”

Section: Introductionmentioning

confidence: 99%

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Identification of Organic Matter Dispersions Based on Light Scattering Matrices Focusing on Soil Organic Matter Management

et al. 2020

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The origin of organic matter, its spread, scattering, and functioning are influenced by the physical structure of liquid or dispersed media of organic matter. Refractive indices of fodder yeast grown on paraffin oil (paprin) and natural gas (gaprin) as well as Lycoperdon spore and organelles were measured by laser phase microscopy. The scattering matrices of aqueous suspensions of paprin, gaprin, and Lycoperdon spores were measured using a laser polarimeter with the scattering angle ranging from 20 to 150°. The experimentally measured scattering matrices have been approximated by the weighted sum of theoretically calculated scattering matrices using the T-matrix code developed by Mishchenko. Most of the particle radii in the filtered fraction of paprin and gaprin were within the range of about 0.05−0.12 μm. Particle radii of the Lycoperdon spore suspension were within the range of 0.4−2.4 μm, which corresponded to both whole spores and their separate organelles. A possibility of identifying a suspension by its scattering matrices was shown for a small difference in the real parts of the refractive index in the example of paprin and gaprin. The measurements of the light scattering matrix showed that for a small size parameter of about 1, the identification of paprin and gaprin can be based only on a difference in the particle shape. Refractive index difference is manifested for the size parameter values higher than 3. An example of a suspension consisting of micron-sized spores and their submicron organelles shows high sensitivity of the scattering matrix to the composition of the dispersed material. The presented data and models help to extrapolate the results of the light scattering matrix study to a vast spectrum of media of organic matter origin and functioning. This study focused on the Biogeosystem Technique (BGT*) transcendental methodology to manage soil as an arena of biodegradation and organic synthesis. A BGT*-based robotic system for intra-soil pulse continuous−discrete water and matter supply directly into the dispersed−aggregated physical structure of the soil media was developed. The system enables transformation of soil into a stable highly productive organic chemical bioreactor for better controlled nanoparticle biomolecular interactions and adsorption by biological and mineral media. The scattering matrix measurement unit is supposed to be used in the robotic system as a diagnostic tool for the dispersion composition of soil organic components.

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“…Quantitative techniques and models of the dispersed medium studies were considered in this research. − ,, …”

Section: Experimental Section and Computational Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification of Organic Matter Dispersions Based on Light Scattering Matrices Focusing on Soil Organic Matter Management

et al. 2020

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“…Alternatively, decreasing the concentration of the functional groups prevents unwanted products and limits the total number of active sites on the surface. To avoid self-condensation and to enhance the grafting process, the reaction parameters should be precisely controlled [ 7 , 12 , 16 , 17 ]. In the present work, amino-modified pHOPs were synthesized via the post-grafting approach at different reaction parameters.…”

Section: Introductionmentioning

confidence: 99%

Amino Surface Modification and Fluorescent Labelling of Porous Hollow Organosilica Particles: Optimization and Characterization

et al. 2022

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Surface modification of silica nanoparticles with organic functional groups while maintaining colloidal stability remains a synthetic challenge. This work aimed to prepare highly dispersed porous hollow organosilica particles (pHOPs) with amino surface modification. The amino-surface modification of pHOPs was carried out with 3-aminopropyl(diethoxy)methylsilane (APDEMS) under various reaction parameters, and the optimal pHOP-NH2 sample was selected and labelled with fluorescein isothiocyanate (FITC) to achieve fluorescent pHOPs (F-HOPs). The prepared pHOPs were thoroughly characterized by transmission electron microscopy, dynamic light scattering, FT-IR, UV-Vis and fluorescence spectroscopies, and microfluidic resistive pulse sensing. The optimal amino surface modification of pHOPs with APDEMS was at pH 10.2, at 60 °C temperature with 10 min reaction time. The positive Zeta potential of pHOP-NH2 in an acidic environment and the appearance of vibrations characteristic to the surface amino groups on the FT-IR spectra prove the successful surface modification. A red-shift in the absorbance spectrum and the appearance of bands characteristic to secondary amines in the FTIR spectrum of F-HOP confirmed the covalent attachment of FITC to pHOP-NH2. This study provides a step-by-step synthetic optimization and characterization of fluorescently labelled organosilica particles to enhance their optical properties and extend their applications.

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“…In this context, optical fiber sensors (OFS) are promising alternatives for the aforementioned technologies owing to their intrinsic characteristics, such as compact size, remote operation, and, especially in the case of silica waveguides, immunity to a variety of biochemical reagents [13,14]. For instance, the design of OFS based on the dynamic light scattering (DLS) phenomenon to investigate the size and concentration of static nanoparticles dispersions has been reported in the literature [12,[15][16][17].…”

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confidence: 99%

Evaluation of Silica Nanofluids in Static and Dynamic Conditions by an Optical Fiber Sensor

Soares

Rodrigues

Schenkel

et al. 2020

Sensors

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This work presents an optical fiber dynamic light scattering sensor capable of simultaneously assessing concentration and flow speed of nanofluids. Silica nanoparticles (189 nm) in water were tested, yielding a sensitivity of 0.78288 × 10³ s−1 for static conditions. Then, the sensor was submitted to situations that simulate spatial concentration changes, offering better results than those obtained by traditional mathematical models. Finally, in flow tests, the light backscattered by the nanoparticles were collected by a fiber probe placed parallel to the streamline, whereas intensity values were processed by artificial neural networks. The sensor provides average errors of 0.09 wt% and 0.26 cm/s for concentration and speed measurements, respectively, and can be further applied to assess different types of nanofluids and inline processes.

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Evaluation of Silica Nanoparticle Colloidal Stability With a Fiber Optic Quasi-Elastic Light Scattering Sensor

Cited by 9 publications

References 32 publications

Identification of Organic Matter Dispersions Based on Light Scattering Matrices Focusing on Soil Organic Matter Management

Identification of Organic Matter Dispersions Based on Light Scattering Matrices Focusing on Soil Organic Matter Management

Amino Surface Modification and Fluorescent Labelling of Porous Hollow Organosilica Particles: Optimization and Characterization

Evaluation of Silica Nanofluids in Static and Dynamic Conditions by an Optical Fiber Sensor

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