A Robust and Facile Approach To Assembling Mobile and Highly-Open Unfrustrated Triangular Lattices from Ferromagnetic Nanorods

Gupta, Maneesh K.; Kulkarni, Dhaval D.; Geryak, Ren; Naik, Swati; Tsukruk, Vladimir V.

doi:10.1021/nl303268s

Cited by 22 publications

(25 citation statements)

References 56 publications

(76 reference statements)

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“…The rod‐like ferromagnetic nanoparticles deserve a special attention because of their specific anisotropic interactions favoring uniaxial magnetic anisotropy of alignment of spins along the nanorod axis . This type of anisotropic ordering is attractive for the different high‐tech applications, in particular, in medical, sensoric, optofluidic, and microrheological engineering.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ferromagnetic Nanorods in Applications to Control of the In‐Plane Anisotropy of Composite Films and for In Situ Characterization of the Film Rheology

Kornev

2016

Adv Funct Materials

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3796 wileyonlinelibrary.com nanorods as the fi llers are believed to be the best candidates for materials working in extreme environment and hence they are on demand in aerospace and space exploration applications. [39][40][41][42][43] In composite fi lms needed for inductor and antennae applications, the alignment of magnetic particles is required to increase the high frequency permeability and to lower the hysteresis losses. [44][45][46][47] In applications to manufacturing of high density recording fi lms and discs, spin alignment is required to carry the recorded information when spins in magnetic nanorods are prone to align parallel to the nanorod axis. [ 37,[48][49][50] In optical applications, magnetic liquid crystals are attractive candidates for making reconfi gurable magnetooptical devices with the fast time response measured in milliseconds. [11][12][13][14][15][16][17][18][51][52][53] In all these applications, one needs to control the alignment of magnetic nanorods in liquid medium. Therefore, this problem is actively discussed in the literature; however, the general strategy for making macroscopic samples with ordered nanorods has not been developed yet and it remains the main challenge of materials engineering [32][33][34][35][39][40][41][42]54 ] Processing of multifunctional coatings and thin fi lms require many steps and hence one needs to control the fi lm properties at each step.Rheological properties of the fi lms at each stage of their processing play the most important role in nanorod ordering and keeping nanorods in place. Characterization of thin coating fi lms during composite manufacturing remains challenging. Different experimental methods have been proposed and developed for in situ characterization of rheological properties of thin fi lms and coatings. [ 20,[25][26][27][55][56][57][58][59][60] It appears that unique features of rotation of ferromagnetic nanorods can be used for characterization of very thin fi lms when other methods fall short. Recently introduced magnetic rotational spectroscopy (MRS) with nanoparticles and nanorods allows one to probe fl uid rheology in very thin fi lms and nanoliter droplets. [ 12,20,22,25,60,61 ] MRS takes advantage of a distinguishable behavior of rotating magnetic tracers as the frequency of applied rotating fi eld changes. Unlike many methods based on the analysis of small oscillations, which are diffi cult to interpret when the fi lm is very thin, MRS with magnetic nanorods enjoys analysis of full revolutions of magnetic tracers. [ 20,22,24,25,60,62,63 ] Understanding of the characteristic features of rotation of a single nanorod in complex fl uids and alignment of an assembly

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Section: Introductionmentioning

confidence: 99%

“…Ferromagnetic nanorods bring about a new feature of the in‐plane magnetic ordering in thin composite films when all magnetic moments of the nanorods are pointing in the directions of nanorod placement . This makes them unique candidates for manufacturing multifunctional composites with unprecedented magnetic and mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic Nanorods in Applications to Control of the In‐Plane Anisotropy of Composite Films and for In Situ Characterization of the Film Rheology

Kornev

2016

Adv Funct Materials

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“…These nanorods and the magneticfluid filled carbon nanotubes [85,137] can be produced in the uniform sizes and manipulated via an external magnetic field. Magnetic nanorods of 100 nm -200 nm diameter can be covered with polymers to prevent their agglomeration [94,116,142]. The template grown nanorods exhibit ferromagnetic order, with a distinguishable hysteresis loop (Fig 14).…”

Section: Elongated Probesmentioning

confidence: 99%

Magnetic Rotational Spectroscopy for Probing Rheology of Nanoliter Droplets and Thin Films

Kornev

Aprelev

et al. 2016

Magnetic Characterization Techniques for Nanomaterials

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As one of the characterization tools for nanoscience & nanotechnology, magnetic rotational spectroscopy (MRS) with magnetic nanoprobes is a powerful method for in-situ characterization of minute amounts of complex fluids and for study of nanoscale structures in fluids. In MRS, a uniformly rotating magnetic field rotates magnetic micro-or nano-probes in the liquid and one studies rheological properties by analyzing the features of the probe rotation. The technique relies only on full rotations (rather than oscillations) of the magnetic moment of the probes. AbstractIn-situ characterization of minute amounts of complex fluids is a challenge. Magnetic Rotational Spectroscopy (MRS) with submicron probes offers flexibility and accuracy providing desired spatial and temporal resolution in characterization of nanoliter droplets and thin films when other methods fall short. MRS analyzes distinct features of the in-plane rotation of a magnetic probe, when its magnetic moment makes full revolution following an external rotating magnetic field. The probe demonstrates a distinguishable movement which changes from rotation to tumbling to trembling as the frequency of rotation of the driving magnetic field changes. In practice, MRS has been used in analysis of gelation of thin polymer films, ceramic precursors, and nanoliter droplets of insect biofluids. MRS is a young field, but it has many potential applications requiring rheological characterization of scarcely available, chemically reacting complex fluids.

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“…This design is essential for direct assembly of aligned, uniformly oriented magnetic−plasmonic nanorods into an ordered large-scale monolayer under a magnetic field applied to the dispersed nanorod solution. 27 These segmented nanorods were used as a model system containing both magnetically and optically "active" segments and chosen from different designs. 27 For these experiments, we utilized symmetrical cylindrical nanorods with a diameter of 250 nm and equal lengths of the gold and nickel segments of 400 nm to ensure the location of the SPP in the visible wavelength range ( Figure 1A).…”

mentioning

confidence: 99%

“…27 These segmented nanorods were used as a model system containing both magnetically and optically "active" segments and chosen from different designs. 27 For these experiments, we utilized symmetrical cylindrical nanorods with a diameter of 250 nm and equal lengths of the gold and nickel segments of 400 nm to ensure the location of the SPP in the visible wavelength range ( Figure 1A). These nanorods were functionalized with a polyvinyl pyrrilidone (PVP) coating which serves as a means to tether the nanorods to the PVPcoated polymethacrilic acid (PMAA) substrate (see Methods).…”

mentioning

confidence: 99%

Remote Giant Multispectral Plasmonic Shifts of Labile Hinged Nanorod Array via Magnetic Field

et al. 2015

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We report a remotely mediated and fast responsive plasmonic-magnetic nanorod array with extremely large variability in optical appearance (up to 100 nm shifts in scattering maxima) and concurrently for multiple wavelengths in a broad range from UV-vis to near-infrared (at 450, 550, and 670 nm) with an external magnetic field with variable direction. The observed phenomenon demonstrates a rapid, wide-range response controlled via a noninvasive remote stimulus. The remotely controlled system suggested here is a magnetic field-directed assembly of an ordered monolayer array of unipolar oriented magnetic-plasmonic nickel-gold nanorods flexibly hinged to a sticky substrate. The unique geometry of the mobile nanorod array allows for the instant alteration of the surface plasmon polariton modes in the gold segment of the controllably tilting nanorods. This design demonstrates the utility of hybrid bimetallic nanoparticles and gives a novel approach to the design of fast-acting, remotely controlled color-changing nanomaterials for sensing and interfacial transport.

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A Robust and Facile Approach To Assembling Mobile and Highly-Open Unfrustrated Triangular Lattices from Ferromagnetic Nanorods

Cited by 22 publications

References 56 publications

Ferromagnetic Nanorods in Applications to Control of the In‐Plane Anisotropy of Composite Films and for In Situ Characterization of the Film Rheology

Ferromagnetic Nanorods in Applications to Control of the In‐Plane Anisotropy of Composite Films and for In Situ Characterization of the Film Rheology

Magnetic Rotational Spectroscopy for Probing Rheology of Nanoliter Droplets and Thin Films

Remote Giant Multispectral Plasmonic Shifts of Labile Hinged Nanorod Array via Magnetic Field

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