Abrasion Indicators for Smart Surfaces Based on a Luminescence Turn‐On Effect in Supraparticles

Wenderoth, Sarah; Granath, Tim; Prieschl, Johannes; Wintzheimer, Susanne; Mandel, Karl

doi:10.1002/adpr.202070002

Cited by 9 publications

(24 citation statements)

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“…The dye aliquot was prepared by dilution of 9 mg (0.017 mol) of rhodamine B isothiocyanate in 2 mL dimethyl sulfoxide and mixing with 13 µL (0.055 mmol) 3‐aminopropyltriethoxysilane. [ 20 ]…”

Section: Methodsmentioning

confidence: 99%

A Simple Model Setup Using Spray‐Drying Principles and Fluorescent Silica Nanoparticles to Evaluate the Efficiency of Facemask Materials in Terms of Virus Particle Retention

Oppmann

Wenderoth

Ballweg

et al. 2021

Adv Materials Technologies

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Herein, a simple model setup is presented to spray fine liquid droplets containing nanoparticles in an air stream transporting this toward a filter material. The nanoparticles are made of silica and tagged with a fluorescent dye in order to render the trace of the particles easily visible. The silica nanoparticles, in a first approximation, mimic virus (severe acute respiratory syndrome coronavirus 2) particles. The setup is used to evaluate different tissues, nowadays, in times of the coronavirus pandemic, commonly used as facemasks, with regard to their particle retention capability. The setup enables adjusting different “breathing scenarios” by adjusting the gas flow speed and, thereby, to compare the filter performance for these scenarios. The effective penetration of particles can be monitored via fluorescence intensity measurements and is visualized via scanning electron micrographs and photographs under UV light. Ultimately, a strong increase of particle penetration in various mask materials as function of flow speed of the droplets is observed and an ultimate retention is only observed for FFP3 and FFP2 masks.

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Section: Methodsmentioning

confidence: 99%

A Simple Model Setup Using Spray‐Drying Principles and Fluorescent Silica Nanoparticles to Evaluate the Efficiency of Facemask Materials in Terms of Virus Particle Retention

Oppmann

Wenderoth

Ballweg

et al. 2021

Adv Materials Technologies

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“…This has been explained in detail for gas sensing applications (Section 2.1.1) but also holds for every type of sensor leading to high sensitivity and selectivity of these SPs. A few research groups [ 205–207 ] even demonstrated that SP‐based sensors can provide a response to analyte binding or mechanical forces through structural reorganization or fragmentation of their components which is an advanced sensor behavior in comparison to nanomaterial‐based sensors that normally show a direct change of their physical properties.…”

Section: Supraparticles For Sustainabilitymentioning

confidence: 99%

“…[ 208 ] Besides other mechanical stress indicator SPs, [ 209 ] a shear indicator based on hierarchically structured luminescent dye‐doped silica NPs and iron oxide NPs assembled via spray‐drying has been established. [ 207 ] It reports damages, e.g., by an increase in fluorescence signal (Figure 11c).…”

Section: Supraparticles For Sustainabilitymentioning

confidence: 99%

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Supraparticles for Sustainability

Wintzheimer

Reichstein

Groppe

et al. 2021

Adv Funct Materials

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The indispensable transformation to a (more) sustainable human society on this planet heavily relies on innovative technologies and advanced materials. The merits of nanoparticles (NPs) in this context are demonstrated widely during the last decades. Yet, it is believed that the impact of particle‐based nanomaterials to sustainability can be even further enhanced: taking NPs as building blocks enables the creation of more complex entities, so‐called supraparticles (SPs). Due to their evolving phenomena coupling, emergence, and colocalization, SPs enable completely new material functionalities. These new functionalities in SPs can be utilized to render six fields, essential to human life as it is conceived, more sustainable. These fields, selected based on an entropy‐rate‐related definition of sustainability, are as follows: 1) purification technologies and 2) agricultural delivery systems secure humans “fundamental needs.” 3) Energy storage and conversion, as well as 4) catalysis enable the “basic comfort.” 5) Extending materials lifetime and 6) bringing materials back in use ensure sustaining “modern life comfort.” In this review article, a perspective is provided on why and how the properties of SPs, and not simply properties of individual NPs or conventional bulk materials, may grant attractive alternative pathways in these fields.

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“…For this purpose, pH‐adjusted citrate modifications were performed on superparamagnetic iron oxide nanoparticles (SPIONs), suggesting them to be representative for a variety of modifiable nanoparticulate surfaces. SPIONs can be easily prepared using the method of coprecipitation [ 17,21–33 ] and are as such relevant for, e.g., biomedical applications, wastewater treatment, sensors, or ferrofluids. [ 2,13,17,21,23–25,28,30,31,34–39 ] In addition to its many possible applications, the nanoparticulate iron oxide possesses—with regard to the investigation—the advantage that citrate links to it relatively strongly.…”

Section: Introductionmentioning

confidence: 99%

The Significant Influence of the pH Value on Citrate Coordination upon Modification of Superparamagnetic Iron Oxide Nanoparticles

Granath¹,

Mandel

Löbmann

2022

Part & Part Syst Charact

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Although citrates are commonly used to modify nanoparticles, attention is rarely paid to how the modification parameters affect the type of adsorption and, thus, possibly, the properties of the modified particles. The relevance of this and the significant impact it can have is demonstrated in this study by examining the effect of pH upon the modification of superparamagnetic iron oxide nanoparticles (SPIONs) with citrate, using a citrate concentration that yields a high molecular surface density but induces almost no coordination pressure. Relying first on a number of classical surfaces analyzing methods, no clear pH‐dependent differences can be identified. Finally, the consideration of the thermally induced redox behavior gives a decisive clue to unravel the “citric acid mystery” and to put together the, until then, weak hints into an overall picture. This shows that the citrate carboxyl groups are linked to the oxidic surface pH dependently via hydrogen bonds to hydroxide groups or coordinatively to iron ions and, besides, also interact, to a certain extent, with ammonia that is used for pH adjustment. With these findings, it is finally possible to explain the observed differences when the citrate‐modified SPIONs are coated with silica (SiO2) or redispersed after spray‐drying.

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Abrasion Indicators for Smart Surfaces Based on a Luminescence Turn‐On Effect in Supraparticles

Cited by 9 publications

References 0 publications

A Simple Model Setup Using Spray‐Drying Principles and Fluorescent Silica Nanoparticles to Evaluate the Efficiency of Facemask Materials in Terms of Virus Particle Retention

A Simple Model Setup Using Spray‐Drying Principles and Fluorescent Silica Nanoparticles to Evaluate the Efficiency of Facemask Materials in Terms of Virus Particle Retention

Supraparticles for Sustainability

The Significant Influence of the pH Value on Citrate Coordination upon Modification of Superparamagnetic Iron Oxide Nanoparticles

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