Selective Alignment of Molecular Glass Wrinkles by Engineered Magnetic Field Landscapes

Huckfeldt, Henning; Ahrend, Florian; Holzinger, Dennis; Klein, Holger; Engel, Dieter; Melzer, Michael; Makarov, Denys; Schmidt, Oliver G.; Fuhrmann‐Lieker, Thomas; Ehresmann, A.

doi:10.1002/adfm.201503155

Cited by 8 publications

(9 citation statements)

References 41 publications

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“…Consequently, IBMP offers the possibility to create magnetic domain patterns which are thermally stable in remanence, that will hardly exist in nature, particularly when related to pure ferromagnetic materials [8]. The unique features of these material systems allow for fundamental investigations on domain wall formation [9][10][11], the design of magnetic stray field tracks [12] as well as the study of their impact on selforganization processes [13,14]. Furthermore, specifically designed domain patterns used together with a dynamically changing external magnetic field to control the motion of superparamagnetic particles are promising for lab-on-a-chip devices [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Modification of the saturation magnetization of exchange bias thin film systems upon light-ion bombardment

Huckfeldt

Gaul

Müglich

et al. 2017

J. Phys.: Condens. Matter

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The magnetic modification of exchange bias materials by 'ion bombardment induced magnetic patterning' has been established more than a decade ago. To understand these experimental findings several theoretical models were introduced. Few investigations, however, did focus on magnetic property modifications caused by effects of ion bombardment in the ferromagnetic layer. In the present study, the structural changes occurring under ion bombardment were investigated by Monte-Carlo simulations and in experiments. A strong reduction of the saturation magnetization scaling linearly with increasing ion doses is observed and our findings suggest that it is correlated to the swelling of the layer material based on helium implantation and vacancy creation.

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Section: Introductionmentioning

confidence: 99%

Modification of the saturation magnetization of exchange bias thin film systems upon light-ion bombardment

Huckfeldt

Gaul

Müglich

et al. 2017

J. Phys.: Condens. Matter

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“…The wrinkled structures can be generated from a mismatched modulus and thermal expansion between a soft matrix and a hard surface. − It is worth mentioning that the material selected for a hard surface must have appropriate toughness so that it will not be brittle in the process of repeated wrinkling. To this end, a free-standing polydimethylsiloxane (PDMS) elastomer with 0.05 wt % carbon nanotubes (CNTs) was selected as the soft matrix.…”

Section: Results and Discussionmentioning

confidence: 99%

A Near-Infrared-Triggered Dynamic Wrinkling Biointerface for Noninvasive Harvesting of Practical Cell Sheets

Chen

Yao

et al. 2021

ACS Appl. Mater. Interfaces

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Cell sheet engineering represents a new era of precise and efficient regenerative medicine, but its efficacy is limited by the elaborative preparation and the weak mechanics. Herein, a near-infrared (NIR)-triggered dynamic wrinkling biointerface was designed for rapid acquisition of practical cell sheets. The biocompatible NIR can initiate the photothermal-mechanical linkage cascade to efficiently dissolve the collagen supporting layer and release the high-quality cell sheets. The interfacial shear force generates with the dynamic wrinkling, playing an active role in accelerating the cell sheet release. High-quality and self-supporting cell sheets can be harvested within a few minutes, demonstrating a new paradigm of photothermal-mechanical manipulation. The transplantable cell sheets with outstanding physiological and mechanical performances were proven to promote wound healing in skin regeneration. This method may open a completely new front in thermal and mechanical responsive cascade to harvest cell sheets, facilitating their wide applications in regenerative medicine.

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“…Sun and co-workers demonstrated moisture-sensitive wrinkles by designing moisture-dependent gradient changes of the cross-linking degree, modulus, and thus swelling degree in the poly(vinyl alcohol) top layer . In addition, the incorporation of photochromic molecules or magnetic nanoparticles provides an opportunity to develop a kind of reversible wrinkle pattern capable of stimuli-responsiveness to magnetic or electric fields . Most of the previous studies chiefly concerned the complicated fabrication of stimulus-responsive and functional skin layers to achieve a dynamic wrinkle pattern.…”

Section: Physically Driven Dynamic Wrinklementioning

confidence: 99%

“…However, the development of dynamic patterns remains a significant challenge. Among various approaches to fabricate surface patterns with different morphologies, the wrinkling of thin films is a powerful alternative to generate dynamic patterns due to spontaneous formation, versatility, easy preparation in large-area, and sensitivity in response to various stimuli. ,− In this Accounts, we review the involved materials and principle in the focused field of smart patterned surfaces with dynamic wrinkles and highlight recent advances via unique chemical and physical strategies.…”

Section: Introductionmentioning

confidence: 99%

Smart Patterned Surface with Dynamic Wrinkles

2019

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CONSPECTUS: Patterned surfaces are fundamentally important to physics, chemistry, materials, and biology science, endowing significant functions and thus bearing broad and fantastic applications whether in natural or man-made events. Among the various methods for patterning surfaces, wrinkling or buckling offers a powerful alternative to prepare surface patterns because of its spontaneous nature, versatility, easy preparation in large-scale, and capability to be responsive to various stimuli. In particular, patterned surfaces with dynamic wrinkles can tailor the encoded surface properties on demand and can provide a promising alternative for smart surfaces, which has potential for wide applications in enhanced and tunable optical or photoelectric devices, responsive microstructures, switchable wettability, smart adhesion and friction, and so on. The concept of smart patterned surfaces based on dynamic wrinkles is fundamental and versatile, and it is expected that there will be extensive future work based on this concept in generalizing this work to other smart materials and systems, and in using dynamic pattern systems to tune not only morphology but also functional properties encoded in the system's topography. In this Account, we present recent progress on smart surfaces with dynamic wrinkle patterns, including their design, preparation, and potential applications. First, we provide a brief introduction of a basic concept for mechanical instability induced wrinkle patterns and outline the general strategies and mechanics for dynamic wrinkles. Then, we discuss how the wrinkling and dewrinkling processes of a rigid skin bound to a soft substrate in bilayers or gradient layer systems occur by controlling the mechanical properties and geometric characteristics of the top and bulk layers, thereby paving the way for a smart patterned surface using chemical and physical approaches. Next, we discuss various chemical and physical stimuli, including light, temperature, pH, and chemicals, which can be harnessed into an extensive library of complex dynamic wrinkles. We highlight recent advances in preparing multiresponsive dynamic wrinkling patterns by adjusting the intrinsic properties of the skin layers (i.e., Young's modulus and cross-linking density) via dynamic chemistry, such as the Diels−Alder reaction, photodimerization, and supramolecular chemistry. Then, we outline how functional inclusions, such as photothermic or photoelectric additives and magnetic nanoparticles, can enable the composite elastic substrate as a dynamic platform for various functional top-layers to fabricate a smart surface for a desired function. In particular, photothermally reconfigurable wrinkle systems were investigated, where the carbon nanotube (CNT) served to efficiently convert its absorbed light energy into heat, hence actuating a real-time response of a near-infrared light (NIR)-sensitive wrinkle pattern and providing access to the development of advanced optoelectronic devices. In addition, based on their unique characteristics, appl...

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Selective Alignment of Molecular Glass Wrinkles by Engineered Magnetic Field Landscapes

Cited by 8 publications

References 41 publications

Modification of the saturation magnetization of exchange bias thin film systems upon light-ion bombardment

Modification of the saturation magnetization of exchange bias thin film systems upon light-ion bombardment

A Near-Infrared-Triggered Dynamic Wrinkling Biointerface for Noninvasive Harvesting of Practical Cell Sheets

Smart Patterned Surface with Dynamic Wrinkles

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