Time–Temperature Integrating Optical Sensors Based on Gradient Colloidal Crystals

Schöttle, Marius; Tran, Thomas; Feller, Tanja; Retsch, Markus

doi:10.1002/adma.202101948

Cited by 21 publications

(17 citation statements)

References 60 publications

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“…Based on the hypothesized working principle, the sensitivity, more precisely, the amount of additional temperatureinduced SPION-interactions, correlates well with decreasing T g . As the magnitude of percent changes of the magnetic signal cannot be easily compared to percent changes obtained from, for example, optical characterization, [10,13,14] due to the logarithmically decaying spectra obtained in MPS, the small standard deviations with respect to the measurement values demonstrate the sensitivity of the magnetic readout.…”

Section: Tunability Of Magnetic Temperature Indicator Supraparticlesmentioning

confidence: 99%

“…However, these demands require a sufficiently small temperature indicator additive, which allows the readout of information precisely from the desired spot, such as the glue interface between two materials. For many application scenarios, such as cold-chain management of perishable products [7] and temperature monitoring of an electronic device [8] or batteries, [9,10] optical, that is, colorimetric [11] or luminescent, [12][13][14] temperature indicators are promising candidates due to their low-tech visual inspectability. However, their optical signal characteristic implies that the indicator needs to be accessible for light, which prevents their utilization in many scenarios.Hence, creating a readily integrable, (sub-)micrometer-sized magnetic temperature indicator additive could yield a paradigm shift as the magnetic signal transduction is by nature independent of optical absorption of the hosting material.…”

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confidence: 99%

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Recording Temperature with Magnetic Supraparticles

et al. 2022

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Small‐sized temperature indicator additives autonomously record temperature events via a gradual irreversible signal change. This permits, for instance, the indication of possible cold‐chain breaches or failure of electronics but also curing of glues. Thus, information about the materials’ thermal history can be obtained upon signal detection at every point of interest. In this work, maximum‐temperature indicators with magnetic readout based on micrometer‐sized supraparticles (SPs) are introduced. The magnetic signal transduction is, by nature, independent of the materials’ optical properties. This facilitates the determination of valuable temperature information from the inside, that is, the bulk, even of dark and opaque macroscopic objects, which might differ from their surface. Compared to state‐of‐the‐art optical temperature indicators, complementary magnetic readout characteristics ultimately expand their applicability. The conceptualized SPs are hierarchically structured assemblies of environmentally friendly, inexpensive iron oxide nanoparticles and thermoplastic polymer. Irreversible structural changes, induced by polymer softening, yield magnetic interaction changes within and between the hierarchic sub‐structures, which are distinguishable and define the temperature indication mechanism. The fundamental understanding of the SPs’ working principle enables customization of the particles’ working range, response time, and sensitivity, using a toolbox‐like manufacturing approach. The magnetic signal change is detected self‐referenced, fast, and contactless.

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Section: Tunability Of Magnetic Temperature Indicator Supraparticlesmentioning

confidence: 99%

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confidence: 99%

Recording Temperature with Magnetic Supraparticles

et al. 2022

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“…161 Mixed systems of colloids with distinct glass transition temperatures can be made into optical sensors based on time-dependent film formation properties. 162 The phononic bandstructures of mesostructures are governed by the shape of their building blocks, as well as their assembled crystal structures, 163 and the combination of particles with different sizes can increase their phononic bandgaps significantly. 164 Colloidal semiconductor nanocrystals were found to exhibit strong interactions via their organic ligands, lead-ing to a pathway toward exploiting coherent phonons for light sources with high-frequency modulation.…”

Section: New Properties On the Mesoscale?mentioning

confidence: 99%

Soft matter crystallography -- complex, diverse, and new crystal structures in condensed materials on the mesoscale

Dshemuchadse

2021

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An increasing variety of crystal structures has been observed in soft condensed matter over the past two decades, surpassing most expectations for the diversity of arrangements accessible through classical driving forces. Here, we survey the structural breadth of mesoscopic crystals-formed by micellar systems, nanoparticles, colloids etc.-that have been observed both in soft matter experiments and coarse-grained self-assembly simulations. We review structure types that were found to mimic crystals on the atomic scale, as well as those that do not correspond to known geometries and seem to only occur on the mesoscale. While the number of crystal structure types observed in soft condensed matter still lags behind what is known from hard condensed matter, we hypothesize that the high tunability and diversity of building blocks that can be created on the nano-and microscale will render a structural variety that far exceeds that of atomic compounds, which are inevitably restricted by the "limitations" imposed by the periodic table of elements and by the properties of the chemical bond. An infusion of expertise in structural analysis from the field of crystallography into the soft condensed matter community will establish the common language necessary to report, compare, and organize the rapidly accruing structural knowledge gathered from simulations and experiments. The prospect of new materials created in soft matter and new, length-scale-spanning insights into the formation of ordered structures in both hard and soft condensed matter promise exciting new developments in the area of self-assembled mesoscale materials.

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“…In sensing applications, structural color changes of colloidal crystals can be induced by temperature, force, humidity, wettability, or biodegradation to alter refractive index contrast (change in intensity), structural periodicity (change in bandgap), or both ( Schöttle et al, 2021 ). Techniques used to fabricate structural color materials include lithography ( Park et al, 2011 ), nanoimprinting ( Espinha et al, 2018 ), colloidal self-assembly ( Hensley et al, 2022 ), standing wave carving ( Ito et al, 2019 ), and two-photon polymerization-3D printing ( Liu et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

A flexible and stretchable photonic crystal film with sensitive structural color-changing properties for spoiled milk detection

et al. 2022

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Time–Temperature Integrating Optical Sensors Based on Gradient Colloidal Crystals

Abstract: The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/adma.202101948.

Cited by 21 publications

References 60 publications

Recording Temperature with Magnetic Supraparticles

Recording Temperature with Magnetic Supraparticles

Soft matter crystallography -- complex, diverse, and new crystal structures in condensed materials on the mesoscale

A flexible and stretchable photonic crystal film with sensitive structural color-changing properties for spoiled milk detection

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