Karl Mandel
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View article: Assembly of filament-like supraparticles in confined vortex rings
Assembly of filament-like supraparticles in confined vortex rings Open
Assembling nanoscale building blocks into larger supraparticle constructs has emerged as a promising avenue to create highly functional particle systems for numerous applications. In the vortex ring freezing method, toroidal supraparticles…
View article: Magnetically “Programming” Cobalt‐Doped Iron Oxide Nanoparticles for Localized Induction Heating: Triggering a Collective Effect of Magnetic Moment Alignment on Demand
Magnetically “Programming” Cobalt‐Doped Iron Oxide Nanoparticles for Localized Induction Heating: Triggering a Collective Effect of Magnetic Moment Alignment on Demand Open
Induction heating, a contactless and efficient method for generating heat via alternating magnetic fields (AMFs), has evolved from simple thermal applications to precise process control in fields like catalysis, self‐healing, and debonding…
View article: Controlled solvothermal flow synthesis and spray-drying of fluorescent carbon-based nanomaterials based on phenylenediamines
Controlled solvothermal flow synthesis and spray-drying of fluorescent carbon-based nanomaterials based on phenylenediamines Open
Continuous solvothermal syntheses of carbon-based nanomaterials (CBNs) provide an efficient route to generate optically active substances compared to batchwise synthesis. In this study, technical process control and in-line analytical data…
View article: NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity
NanoMOF‐Based Multilevel Anti‐Counterfeiting by a Combination of Visible and Invisible Photoluminescence and Conductivity Open
This study presents nanosized metal‐organic framwork (nanoMOF)‐based multifunctional mixed‐matrix‐membranes (MMMs) and composite powders as extremely sensitive responder materials for a responder‐stimulus based multilevel anti‐counterfeiti…
View article: Bulk Magnetic Properties Arise from Micron‐Sized Supraparticle Interactions and Can be Modified on the Nanoscale
Bulk Magnetic Properties Arise from Micron‐Sized Supraparticle Interactions and Can be Modified on the Nanoscale Open
Magnetic supraparticles (SPs) can be employed as micron‐sized particulate additives in arbitrary objects to serve as ID‐tag or recorder of environmental triggers. Combined with magnetic particle spectroscopy (MPS), which enables read‐out o…
View article: Atomic layer deposition on spray-dried supraparticles to rationally design catalysts with ultralow noble metal loadings
Atomic layer deposition on spray-dried supraparticles to rationally design catalysts with ultralow noble metal loadings Open
This document is the unedited not peer-reviewed Author’s version of a Submitted Work to Chemistry of Materials. The controlled assembly of supraparticles using spray-drying enables the synthesis of nanoporous materials. Changing the size o…
View article: Hydrogen Peroxide Producing Titania-Silica Supraparticles as Tailorable Photocatalysts for Flow Chemistry Reactions in Microfluidic Reactors
Hydrogen Peroxide Producing Titania-Silica Supraparticles as Tailorable Photocatalysts for Flow Chemistry Reactions in Microfluidic Reactors Open
The development of hybrid catalysts for cascade reactions that demonstrate high efficiency and longevity strongly relies on the precise arrangement of the individual components within such a material. This guarantees both their proximity f…
View article: Europium(<scp>iii</scp>)/terbium(<scp>iii</scp>) mixed metal–organic frameworks and their application as ratiometric thermometers with tuneable sensitivity in organic dispersion
Europium(<span>iii</span>)/terbium(<span>iii</span>) mixed metal–organic frameworks and their application as ratiometric thermometers with tuneable sensitivity in organic dispersion Open
Unprecedented insight into the lanthanide dispersion in mixed-metal Eu x Tb 1− x BTC using high-field 1 H MAS NMR spectroscopy. Isolation of Eu sites in the TbBTC matrix leads to efficient Tb-to-Eu energy transfer and high temperature sens…
View article: Nanoparticle Clustering in Supraparticles to Control Magnetic Long‐Range Interactions
Nanoparticle Clustering in Supraparticles to Control Magnetic Long‐Range Interactions Open
To tailor superparamagnetic iron oxide nanoparticles (SPIONs) to the specific needs of diverse application fields, it is essential to understand not only their intrinsic properties but also their interactions with each other. Theoretical m…
View article: Magnetic Supraparticles as Identifiers in Single‐Layer Lithium‐Ion Battery Pouch Cells
Magnetic Supraparticles as Identifiers in Single‐Layer Lithium‐Ion Battery Pouch Cells Open
The development of effective recycling technologies is essential for the recovery and reuse of the raw materials required for lithium‐ion batteries (LIBs). Future recycling processes depend on accessible information, necessitating the impl…
View article: Customizable Induction Heating Profiles: from Tailored Colloidally Stable Nanoparticles Toward Multi‐Stage Heatable Supraparticles
Customizable Induction Heating Profiles: from Tailored Colloidally Stable Nanoparticles Toward Multi‐Stage Heatable Supraparticles Open
Magnetic nanoparticles (NPs) are efficient heat mediators in induction heating. Originally explored for hyperthermia, their applications have broadened to industrial processes where temperature control is crucial. By adjusting the NP compo…
View article: Multifunctional Polymer Composites for Automatable Induction Heating with Subsequent Temperature Verification
Multifunctional Polymer Composites for Automatable Induction Heating with Subsequent Temperature Verification Open
Manipulating ferromagnetic particles using an alternating current (AC) magnetic field is a versatile method for quick, local, and on‐demand heat generation. These particles can be incorporated into various matrices as heating elements. The…
View article: Catalyst Supraparticles: Tuning the Structure of Spray‐Dried Pt/SiO<sub>2</sub> Supraparticles via Salt‐Based Colloidal Manipulation to Control their Catalytic Performance
Catalyst Supraparticles: Tuning the Structure of Spray‐Dried Pt/SiO<sub>2</sub> Supraparticles via Salt‐Based Colloidal Manipulation to Control their Catalytic Performance Open
The structure of supraparticles (SPs) is a key parameter for achieving advanced functionalities arising from the combination of different nanoparticle (NP) types in one hierarchical entity. However, whenever a droplet‐assisted forced assem…
View article: Magnetic polyamide 11 powder for the powder bed fusion process by liquid-liquid phase separation and crystallization
Magnetic polyamide 11 powder for the powder bed fusion process by liquid-liquid phase separation and crystallization Open
Herein, we demonstrate the preparation of magnetic polyamide 11 feedstock powders for powder bed fusion (PBF) using liquid-liquid phase separation and crystallization. By adding magnetic nanomaterials during the precipitation process, the …
View article: Safety Through Visibility: Tracing Hydrogen in Colors with Highly Customizable and Flexibly Applicable Supraparticle Additives
Safety Through Visibility: Tracing Hydrogen in Colors with Highly Customizable and Flexibly Applicable Supraparticle Additives Open
The flammability of H 2 ‐air mixtures demands timely detection and precise localization of H 2 leakages to ensure safety and targeted maintenance measures in the anticipated hydrogen economy. Herein, H 2 indicator supraparticles (SPs) are …
View article: Influence of magnetic interactions in iron oxide nanoparticle polymer composites on magnetism and induction heating
Influence of magnetic interactions in iron oxide nanoparticle polymer composites on magnetism and induction heating Open
Induction heating of composite materials is of great interest in fields such as controlled polymer curing or degradation, self-healing or contactless joining. Ferrimagnetic iron oxide nanoparticle (IONPs) are suitable candidates for a powd…
View article: One-step fabrication of platelet-shaped Janus supraparticles via spray-drying
One-step fabrication of platelet-shaped Janus supraparticles via spray-drying Open
Supraparticles, i.e. assemblies of nanoparticles, can be classified as Janus supraparticles if they comprise two different types of nanoparticles that are asymmetrically distributed within the supraparticles. Due to their anisotropic chara…
View article: Catalyst Supraparticles: Tuning the Structure of Spray-dried Pt/SiO2 Supraparticles via Salt-based Colloidal Manipulation to Control their Catalytic Performance
Catalyst Supraparticles: Tuning the Structure of Spray-dried Pt/SiO2 Supraparticles via Salt-based Colloidal Manipulation to Control their Catalytic Performance Open
The structure of supraparticles (SP) is a key parameter for achieving advanced functionalities arising from the combination of different nanoparticle (NP) types in one hierarchical entity. However, whenever a droplet-assisted forced assemb…
View article: Magnetic Supraparticles Capable of Recording High‐Temperature Events
Magnetic Supraparticles Capable of Recording High‐Temperature Events Open
Superparamagnetic iron oxide nanoparticles (SPIONs) are prone to oxidation at elevated temperatures (>300 °C) and lose their magnetizability upon transition from magnetite/maghemite (γ‐Fe 2 O 3 / Fe 3 O 4 ) to hematite (α‐Fe 2 O 3 ). Silic…
View article: Modulating the Microenvironment of Coumarin Dyes within Multihierarchical Supraparticles: En Route toward Versatile Luminescent Dual‐Threshold Temperature Indicators with Ratiometric Readout
Modulating the Microenvironment of Coumarin Dyes within Multihierarchical Supraparticles: En Route toward Versatile Luminescent Dual‐Threshold Temperature Indicators with Ratiometric Readout Open
Temperature indicators trace (un)desired thermal impacts across their thermal history upon readout at every point of interest via defined irreversible signal changes. Ratiometric luminescent temperature indicators are attractive due to the…
View article: Synthesis and ecotoxicity screening of reusable, magnetically harvestable metal oxide/hydroxide nanocomposites for safe and sustainable removal and recovery of phosphorus from wastewater
Synthesis and ecotoxicity screening of reusable, magnetically harvestable metal oxide/hydroxide nanocomposites for safe and sustainable removal and recovery of phosphorus from wastewater Open
This study assesses the ecotoxicological hazard and suggests measures to improve the ecosafety of 10 highly-efficient metal oxide/hydroxide nanocomposite adsorbents for phosphorus removal/recovery from wastewater using the marine bacterium…
View article: Assembly of Zinc‐Single‐Site‐Containing Silica Nanoparticles to Supraparticle Powders with Destructibility to Serve as Filler and Vulcanization Activator in Rubbers
Assembly of Zinc‐Single‐Site‐Containing Silica Nanoparticles to Supraparticle Powders with Destructibility to Serve as Filler and Vulcanization Activator in Rubbers Open
The vulcanization process is widely used in industry for tire manufacturing. Therefore, zinc oxide is commonly utilized as an activator material, but unreacted zinc oxide remains in the final products and can be released into the environme…
View article: Circular battery design: investing in sustainability and profitability
Circular battery design: investing in sustainability and profitability Open
The market share of low-cost battery chemistries, which offer little to no recycling profitability with current methods, is growing. Design for circularity could be the key to reducing costs and enhancing sustainability for these batteries.
View article: Inductively heatable catalytic materials for the dehydrogenation of the liquid organic hydrogen carrier (LOHC) perhydro dibenzyltoluene
Inductively heatable catalytic materials for the dehydrogenation of the liquid organic hydrogen carrier (LOHC) perhydro dibenzyltoluene Open
The dehydrogenation of perhydro dibenzyltoluene (H18-DBT) is achieved via direct induction heating of Pt-based catalyst materials in bead and plate form.
View article: Mesoporous supraparticles with a tailored solid–liquid–gas interface for visual indication of H<sub>2</sub> gas and NH<sub>3</sub> vapours
Mesoporous supraparticles with a tailored solid–liquid–gas interface for visual indication of H<sub>2</sub> gas and NH<sub>3</sub> vapours Open
Dual-gasochromic supraparticles hosting a tailor-made solid–liquid–gas interface within their mesoporous framework are reported. They make hazardous H 2 gas and NH 3 vapours visible for the naked eye by undergoing rapid gas-specific colour…
View article: Multifunctional, Hybrid Materials Design via Spray‐Drying: Much more than Just Drying
Multifunctional, Hybrid Materials Design via Spray‐Drying: Much more than Just Drying Open
Spray‐drying is a popular and well‐known “drying tool” for engineers. This perspective highlights that, beyond this application, spray‐drying is a very interesting and powerful tool for materials chemists to enable the design of multifunct…
View article: Communicating Supraparticles to Enable Perceptual, Information‐Providing Matter
Communicating Supraparticles to Enable Perceptual, Information‐Providing Matter Open
Materials are the fundament of the physical world, whereas information and its exchange are the centerpieces of the digital world. Their fruitful synergy offers countless opportunities for realizing desired digital transformation processes…