Spray-Deposited Anisotropic Ferromagnetic Hybrid Polymer Films of PS-<i>b</i>-PMMA and Strontium Hexaferrite Magnetic Nanoplatelets

Cao, Wuteng; Yin, Shanshan; Plank, Martina; Chumakov, Andrei; Opel, Matthias; Chen, Wei; Kreuzer, Lucas P.; Heger, Julian E.; Gallei, Markus; Brett, Calvin J.; Schwartzkopf, Matthias; Елисеев, А.А.; Anokhin, Evgeny O.; Trusov, Lev A.; Roth, Stephan V.; Müller‐Buschbaum, Peter

doi:10.1021/acsami.0c19595

Cited by 12 publications

(24 citation statements)

References 66 publications

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“…Such increased order of the DBC structure in the hybrid film originates from the reduced number of parallel PMMA cylinders (as seen in SEM) due to the addition of the FePt NPs. The more parallel PMMA cylinders are present, the more they disturb the DBC structure, [ 17 ] because they are distributed in the film with random orientations (Figure 1). With further increasing time, again an increase in the error bars of feature I is observed (from 12.6 to 33.6 s, marked with semi‐transparent colors in Figure 3c).…”

Section: Resultsmentioning

confidence: 99%

“…In our previous studies, various methods, like spin coating, spray coating, and printing, were utilized to prepare magnetic NP-DBC films with different morphologies and magnetic properties. [15][16][17] Among these fabrication methods, printing has obtained increasing attention because of its large-scale production capability in industrial applications. [15,18,19] Moreover, printing is an effective method to obtain homogeneous films with smooth surfaces on a macroscopic level compared to other methods such as spray coating.…”

Section: Introductionmentioning

confidence: 99%

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In Situ Study of FePt Nanoparticles‐Induced Morphology Development during Printing of Magnetic Hybrid Diblock Copolymer Films

Cao

Yin

Bitsch

et al. 2021

Adv Funct Materials

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The development of magnetic hybrid films containing diblock copolymers (DBCs) and magnetic nanoparticles (NPs) by printing is a highly promising method for scalable and low-cost fabrication. During printing, the drying and arrangement kinetics of the DBC and magnetic NPs play an important role in the film formation concerning morphology and magnetic properties. In this study, the morphology evolution of ultrahigh molecular weight DBC polystyrene-block-poly(methyl methacrylate) and magnetic iron platinum (FePt) NPs is investigated with grazing-incidence small-angle X-ray scattering (GISAXS) in situ during printing. For comparison, a pure DBC film is printed without FePt NPs under the same conditions. The GISAXS data suggest that the addition of NPs accelerates the solvent evaporation, leading to a faster film formation of the hybrid film compared to the pure film. As the solvent is almost evaporated, a metastable state is observed in both films. Compared with the pure film, such a metastable state continues longer during the printing process of the hybrid film because of the presence of FePt NPs, which inhibits the reorganization of the DBC chains. Moreover, investigations of the field-dependent magnetization and temperature-dependent susceptibility indicate that the printed hybrid film is superparamagnetic, which makes this film class promising for magnetic sensors.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In Situ Study of FePt Nanoparticles‐Induced Morphology Development during Printing of Magnetic Hybrid Diblock Copolymer Films

Cao

Yin

Bitsch

et al. 2021

Adv Funct Materials

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“…In fact, recently, numerous attempts were made to further enhance/improve the magnetic properties of the SFO by metal ion doping, adopting suitable synthesis methods, and optimizing the processing conditions. 2 − 15 Also, composites of SFO with soft magnetic phases and improved magnetic properties achieved through the exchange-spin mechanism have been reported in the literature. 3 , 10 , 16 , 17 For instance, using a conducting polymer and a SFO content for tunability, polypyrrole/SFO composites were designed and tested for efficient EM-shielding purposes.…”

Section: Introductionmentioning

confidence: 99%

“… 10 Most recently, magnetic hybrid films containing diblock copolymers (DBCs) and magnetic NPs of SFO were also considered for sensor applications. 2 Spray deposition was applied to prepare perpendicular anisotropic magnetic hybrid films by controlling the orientation of SFO nanoplatelets inside ultra-high-molecular-weight DBC polystyrene- block -poly(methyl methacrylate) (PS- b -PMMA) films. 2 Using the superconducting quantum interference device data, authors demonstrated that the ferromagnetic hybrid polymer films with high coercivity can be achieved via spray deposition.…”

Section: Introductionmentioning

confidence: 99%

“… 2 Spray deposition was applied to prepare perpendicular anisotropic magnetic hybrid films by controlling the orientation of SFO nanoplatelets inside ultra-high-molecular-weight DBC polystyrene- block -poly(methyl methacrylate) (PS- b -PMMA) films. 2 Using the superconducting quantum interference device data, authors demonstrated that the ferromagnetic hybrid polymer films with high coercivity can be achieved via spray deposition. The spray-deposited hybrid films were reported to be highly promising for potential applications in magnetic data storage and sensing.…”

Section: Introductionmentioning

confidence: 99%

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Aluminum Doping and Nanostructuring Enabled Designing of Magnetically Recoverable Hexaferrite Catalysts

et al. 2022

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We demonstrate an approach based on substituting a magnetic cation with a carefully chosen isovalent non-magnetic cation to derive catalytic activity from otherwise catalytically inactive magnetic materials. Using the model system considered, the results illustratively present that the catalytically inactive but highly magnetic strontium hexaferrite (SrFe 12 O 19 ; SFO) system can be transformed into a catalytically active system by simply replacing some of the magnetic cation Fe 3+ by a non-magnetic cation Al 3+ in the octahedral coordination environment in the SFO nanocrystals. The intrinsic SFO and Al-doped SrFe 12 O 19 (SrFe 11.5 Al 0.5 O 19 ; Al–SFO) nanomaterials were synthesized using a simple, eco-friendly tartrate-gel technique, followed by thermal annealing at 850 °C for 2 h. The SFO and Al–SFO were thoroughly characterized for their structure, phase, morphology, chemical bonding, and magnetic characteristics using X-ray diffraction, Fourier-transform infrared spectroscopy, and vibrating sample magnetometry techniques. Catalytic performance evaluated toward 4-nitrophenol, which is the toxic contaminant at pharmaceutical industries, reduction reaction using NaBH 4 (mild reducing agent), the Al-doped SFO samples exhibit a reasonably good performance compared to intrinsic SFO. The results indicate that the catalytic activity of Al–SFO is due to Al-ions occupying the octahedral sites of the hexaferrite lattice; as these sites are on the surface of the catalyst, they facilitate electron transfer. Furthermore, surface/interface characteristics of nanocrystalline Al–SFO coupled with magnetic properties facilitate the catalyst recovery by simple, inexpensive methods while readily allowing the reusability. Moreover, the activity remains the same even after five successive cycles of experiments. Deriving the catalytic activity from otherwise inactive compounds as demonstrated in the optimized, engineered nanoarchitecture of Al-doped-Sr-hexaferrite may be useful in adopting the approach in exploring further options and designing inexpensive and recyclable catalytic materials for future energy and environmental technologies.

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Low‐Temperature and Water‐Based Biotemplating of Nanostructured Foam‐Like Titania Films Using ß‐Lactoglobulin

Heger

Chen

Yin

et al. 2022

Adv Funct Materials

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Given the broad use of nanostructured crystalline titania films, an environmentally friendly and more sustainable synthesis route is highly desirable. Here, a water-based, low-temperature route is presented to synthesize nanostructured foam-like crystalline titania films. A pearl necklace-like nanostructure is introduced as tailored titania morphology via biotemplating with the use of the major bovine whey protein ß-lactoglobulin (ß-lg). It is shown that titania crystallization in a brookite-anatase mixed phase is promoted via spray deposition at a comparatively low temperature of 120 °C. The obtained crystallites have an average grain size of (4.2 ± 0.3) nm. In situ grazing incidence small-angle and wide-angle X-ray scattering (GISAXS/GIWAXS) are simultaneously performed to understand the kinetics of film formation and the templating role of ß-lg during spray coating. In the ß-lg:titania biohybrid composites, the crystal growth in semicrystalline titania clusters is sterically directed by the condensing ß-lg biomatrix. Due to using spray coating, the green chemistry approach to titania-based functional films can be scaled up on a large scale, which can potentially be used in photocatalytic processes or systems related to energy application.

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Spray-Deposited Anisotropic Ferromagnetic Hybrid Polymer Films of PS-b-PMMA and Strontium Hexaferrite Magnetic Nanoplatelets

Cited by 12 publications

References 66 publications

In Situ Study of FePt Nanoparticles‐Induced Morphology Development during Printing of Magnetic Hybrid Diblock Copolymer Films

In Situ Study of FePt Nanoparticles‐Induced Morphology Development during Printing of Magnetic Hybrid Diblock Copolymer Films

Aluminum Doping and Nanostructuring Enabled Designing of Magnetically Recoverable Hexaferrite Catalysts

Low‐Temperature and Water‐Based Biotemplating of Nanostructured Foam‐Like Titania Films Using ß‐Lactoglobulin

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