Journal: Advanced Materials Interfaces

Abbreviation

Adv. Mater. Interfaces

Publisher

Wiley-VCH

Journal Volumes

ISSN

2196-7350

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2014 - 2019192020 - 202621
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Publications1 - 10 of 40
  • Ultrasound-Controlled Swarmbots Under Physiological Flow Conditions
    Item type: Journal Article
    Del Campo Fonseca, Alexia; Kohler, Tobias; Ahmed, Daniel (2022)
    Advanced Materials Interfaces
    Navigation of microrobots in living vasculatures is essential in realizing targeted drug delivery and advancing non-invasive surgeries. Acoustically-controlled "swarmbots" are developed based on the self-assembly of clinically-approved microbubbles (MBs). Ultrasound is noninvasive, penetrates deeply into the human body, and is well-developed in clinical settings. This propulsion strategy relies on two forces: the primary radiation force and the secondary Bjerknes force. Upon ultrasound activation, the MBs self-assemble into microswarms, which migrate toward and anchor at the containing vessel's wall. A second transducer, which produces an acoustic field parallel to the channel, propels the swarms along the wall. Noting that human arteries have a blood flow 5-19 cm s(-1), powerful features of cross- and upstream swarmbot navigation are demonstrated against physiologically-relevant flow rates that reach 16.7 cm s(-1). Additionally, controlled navigation of swarmbots is shown within mice blood and under pulsatile flow conditions of 100 beats per minute (bpm); an adult human heart at rest executes between 60 and 100 bpm. This capability represents a much-needed pathway for advancing preclinical research.
  • Spatially Controlled 3-D Multiplexed Aptamer Patterning in Hydrogels
    Item type: Journal Article
    Roost, Kevin; Stuber, Annina; Wei, Kongchang; et al. (2025)
    Advanced Materials Interfaces
    The integration of bioreceptors with biocompatible substrates is crucial for advancing in vitro microphysiological systems used in disease modeling, drug screening, and biological research. Expanding spatial control over 3-D bioreceptor patterning enables localized analyte detection, targeted molecular release, and selective sequestration. This study presents strategies for high-resolution, multiplexed aptamer patterning within hydrogels, achieving the smallest 3-D aptamer features reported to date (≈2 µm). Aptamers, synthetically engineered single-stranded DNA or RNA, offer small size, high target specificity, and ease of chemical modification for covalent hydrogel integration. As a proof of concept, two DNA-based aptamers targeting serotonin and dopamine were immobilized in a norbornene-functionalized polyvinyl alcohol hydrogel. Systematic evaluation of UV photopatterning, digital light processing, and two-photon polymerization enabled multiplexed, 3-D aptamer patterns with micron-scale resolution. This work establishes a framework for spatially resolved aptamer localization within 3-D hydrogels, which is particularly important for biosensing in complex in vitro environments, where referencing specific binding requires precise positioning of control DNA near specific aptamers. These advances in spatially controlled aptamer functionalization open new possibilities for engineering modular biointerfaces.
  • Microfluidic Synthesis of Hydrogel Microparticles with Superparamagnetic Colloids Embedded at Prescribed Positions for Anticounterfeiting Applications
    Item type: Journal Article
    Zhang, Mengmeng; Warth, Thom; Boon, Niels; et al. (2022)
    Advanced Materials Interfaces
    A microfluidic platform for continuous synthesis of hydrogel microparticles with superparamagnetic colloids (SPCs) embedded at prescribed positions is described. The shape of the cross-linked microparticle is independently controlled by stop-flow lithography, whereas the position of trapped SPCs are dictated by virtual magnetic moulds made of 2D nickel patches facilitating magnetic trapping. The spatial positions of trapped SPCs collectively function as a binary code matrix for product authentication. Analytical and finite element methods are combined to optimize the trapping efficiency of SPCs by systematically investigating magnetic field microgradients produced by nickel patches. It is envisioned that the proposed magnetic microparticles will contribute to the development of soft matter inspired product quality control, tracking and anti-counterfeiting technologies.
  • Tuning the Surface Electrochemistry by Strained Epitaxial Pt Thin Film Model Electrodes Prepared by Pulsed Laser Deposition
    Item type: Journal Article
    Temmel, Sandra E.; Fabbri, Emiliana; Pergolesi, Daniele; et al. (2016)
    Advanced Materials Interfaces
  • Microscale Motion Control through Ferromagnetic Films
    Item type: Journal Article
    Benassi, Andrea; Schwenk, Johannes; Marioni, Miguel A.; et al. (2014)
    Advanced Materials Interfaces
  • Ferrimagnetic Dynamics Induced by Spin-Orbit Torques
    Item type: Review Article
    Sala, Giacomo; Gambardella, Pietro (2022)
    Advanced Materials Interfaces
    Ferrimagnets are the magnetic materials with the fastest current-induced dynamics reported so far. Among them, rare-earth transition-metal (RE-TM) alloys offer a fertile playground for studying the behavior of multi-sublattice systems with tunable composition and magnetic interactions. This review provides a survey of the magnetic dynamics excited by current-induced spin-orbit torques (SOTs) in RE-TM ferrimagnets coupled to heavy-metal layers. It summarizes the magnetic properties of RE-TM alloys and discusses how interfacial SOTs result in efficient magnetization switching and fast domain-wall motion close to the magnetization and angular momentum compensation points. Recent work shows that the switching is a multiphase process affected by significant stochastic fluctuations. However, strong SOTs results in fast and deterministic sub-ns switching with minimal energy dissipation. In addition, the RE and TM magnetizations can respond asynchronously to SOTs during the reversal. This asynchronous dynamics pinpoints the different strength of the SOTs acting on the two sublattices and challenges the usual assumption of rigid inter-sublattice antiferromagnetic coupling. Overall, the ability to tailor the timescale and reversal mode of RE-TM alloys allows for optimizing the speed of ferrimagnetic spintronic devices and provides insight into the current-induced transfer of angular momentum in systems with synergistic ferromagnetic and antiferromagnetic interactions.
  • Toward Robust Segmented Nanowires: Understanding the Impact of Crystallographic Texture on the Quality of Segment Interfaces in Magnetic Metallic Nanowires
    Item type: Journal Article
    Zhang, Jin; Pané, Salvador; Sort, Jordi; et al. (2016)
    Advanced Materials Interfaces
    Segmented nanowires (NWs) have found a wealth of applications due to their multifunctionality, arising from complementarities and synergies among segments of different materials. However, to ensure a practical use of segmented NWs, high quality interfaces between segments must be ensured. Herein, trisegmented CoPt/Cu/Ni NWs and bisegmented CoPt/Ni magnetic NWs are fabricated by means of template‐assisted electrodeposition and the characteristics of their interfaces are investigated in detail. The presence of a Cu segment sandwiched between the CoPt and the Ni segments severely affects the integrity of the whole NW. Namely, Cu deposits in a (200) textured face‐centered cubic (fcc) structure, which cannot accommodate well on the c‐axis oriented hexagonal close‐packed CoPt. Instead, when the Cu segment is absent, well‐connected CoPt/Ni NWs with smooth interface are obtained. Unlike the Cu segment, Ni shows the (111) textured fcc structure, which holds good crystallographic matching with the underlying CoPt segment. Magnetic measurements reveal that CoPt/Ni NWs exhibit staircase‐like hysteresis loops similar to the trisegmented CoPt/Cu/Ni NWs. Such loop shape stems from the dissimilar coercivity between the hard (CoPt) and soft (Ni) segments. The bisegmented NWs (with robust interfaces) are appealing for multibit recording media, magnetic nanoelectromechanical systems, and magnetically driven drug delivery nanoplatforms.
  • Mechanistic Studies as a Tool for the Design of Copper-Based Heterostructures
    Item type: Journal Article
    Kränzlin, Niklaus; Beek, Wouter; Niederberger, Markus; et al. (2015)
    Advanced Materials Interfaces
  • Non-Fouling Multi-Azide Polyoxazoline Brush-co-Polymers for Sensing Applications
    Item type: Journal Article
    Komsthöft, Tobias; Bartalucci, Niccolò; Tibbitt, Mark W.; et al. (2024)
    Advanced Materials Interfaces
    One of the key parameters of an artificial biosensor is a high signal-to-noise ratio. This is achieved by limiting non-specific interactions while simultaneously maximizing the targeted specific interaction. Here, it is combined non-fouling characteristics of poly(2-methyl-2-oxazoline) (PMOXA) coatings with an abundance of azide groups to create a multi-azide containing poly(2-methyl-2-oxazoline-co-2-(3-azidopropyl)-2-oxazoline) (PMCA) that can participate in bioorthogonal strain-promoted azide-alkyne cycloaddition (SPAAC) for functionalization. This functional polymer is made surface-active using the PAcrAm (TM) technology to obtain well-defined spontaneously adsorbed monolayers on gold surfaces. The resistance to non-specific interactions is tested against full human serum (HS), analyzed via variable angle spectroscopic ellipsometry (VASE), and compared to equivalent coatings based on PMOXA and azido-poly(ethylene glycol) (PEG-N3). The specific interactions are investigated via VASE and quartz crystal microbalance with dissipation (QCM-D) by immobilization of dibenzocyclooctyne-PEG4-biotin conjugate (DBCO-biotin) and streptavidin. The new PMCA-based coating shows superior resistance to non-specific protein adhesion than equivalent coatings based on commercially available PEG-N3 and significantly increases capacity for SPAAC. A proof of principle assay (biotin-streptavidin/biotin-BSA/anti-BSA) shows improved binding for the new PMCA polymer compared with single azide PEG.
  • Solar-Driven Redox Splitting of CO2 Using 3D-Printed Hierarchically Channeled Ceria Structures
    Item type: Journal Article
    Sas Brunser, Sebastian; Bargardi, Fabio; Libanori, Rafael; et al. (2023)
    Advanced Materials Interfaces
    Fuel produced from CO2 and H2O using solar energy can contribute to making aviation more sustainable. Particularly attractive is the thermochemical production pathway via a ceria-based redox cycle, which uses the entire solar spectrum as the source of high-temperature process heat to directly produce a syngas mixture suitable for synthetizing kerosene. However, its solar-to-fuel energy efficiency is hindered by the inadequate isotropic topology of the ceria porous structure, which fails to absorb the incident concentrated solar radiation within its entire volume. Here we design and 3D-print hierarchically channeled structures of pure ceria by Direct Ink Writing (DIW) to enable volumetric radiative absorption while maintaining high effective densities required for maximizing the fuel yield. The complex interplay between radiative heat transfer and thermochemical reaction was investigated in a solar thermogravimetric analyzer with samples exposed to high-flux irradiation, mimicking realistic operation of solar reactors. Channeled structures with a stepwise optical thickness achieved a higher and more uniform temperature profile compared to that of state-of-art isotropic structures, doubling the volume-specific fuel yield for the same solar flux input. Thermomechanical stability of the ceria graded structures, DIW-printed using a novel ink formulation with optimal rheological behaviour, was validated by performing 100 consecutive redox cycles.
Publications1 - 10 of 40