Magnetic field assisted assembly of highly ordered percolated nanostructures and their application for transparent conductive thin films

Trotsenko, Oleksandr; Tokarev, Alexander; Gruzd, Alexey; Enright, Timothy M.; Minko, Sergiy

doi:10.1039/c5nr00154d

Cited by 36 publications

(35 citation statements)

References 52 publications

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“…Alignment of conductive nanowires to generate an anisotropic percolated network with fewer defects could substantially improve electrical and optical properties of the coatings . Recently, Trotsenko et al ( Figure ) developed a method of magnetic field directed assembly of conductive nanowires to generate aligned conductive networks that could be applied on relatively large (macroscopic) surface areas …”

Section: Assembly and Manipulation Of Mixed Systems Of Magnetic And Nmentioning

confidence: 99%

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Nanostructured Soft Matter with Magnetic Nanoparticles

Tokarev

Yatvin

Trotsenko

et al. 2016

Adv Funct Materials

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3761wileyonlinelibrary.com single magnetic domain of the particle. The mean time between fl ips (the Neel relaxation time) depends on temperature. For many practical applications, the time of the experiment is orders of magnitude longer than the Neel relaxation time, so that the average particle magnetization is zero. The random fl ipping depends on temperature. At a given (generally low) temperature (termed the blocking temperature) the Neel relaxation time is the same as the characteristic time of the experiment, and thus above the blocking temperature the nanoparticle is superparamagnetic. The blocking temperature depends on the particle composition, size and shape. For example, for a 10 nm diameter spherical Fe 3 O 4 nanoparticle in a typical laboratory experiment the blocking temperature is far below 200 K, [ 2 ] thus the particles are superparamagnetic for most intended applications. Very low toxicity, low cost, simple and well-reproducible synthesis render iron oxide nanoparticles the most extensively used superparamagnetic nanomaterial.The response of a superparamagnetic particle to a magnetic fi eld and the experimental timeframe required for loss of the average magnetization has been intensively explored in numerous examples of stimuli-responsive nanostructures. The major advantage of materials based on magnetic particles is that the mechanism of response does not interfere with many other properties of the materials and that the magnetic fi eld (with a practical range on the order of 1 Tesla or less) is noninvasive for living organisms. The latter is a critical aspect for biomedical and other applications involving live species. The number of annual publications that utilize superparamagnetic nanoparticles is >1000 and rising. The rapid increase of interest in magnetic nanoparticles (MNPs) can be attributed to studies on magnetic imaging and drug delivery systems which built upon older research involving ferrofl uids. A number of excellent reviews have recently been published on the synthesis and applications of MNPs, [ 3 ] surface functionalization, [ 4 ] their biomedical applications, [ 3b , 5 ] applications in recyclable catalysts, [ 6 ] MNP toxicity, [ 7 ] and many others. [ 8 ] This review is focused on the surface functionalization of MNPs that can be used to either (a) generate nanostructured materials or to (b) add responsive properties to the materials. The goal of this review is to assemble the most practical and important information for material scientists working in the area of nanostructured materials with a focus on assembly using bottom-up methods. Magnetic fi eld induced forces can be tuned by the regulation of the magnetic fi eld direction, strength and gradient, which provide a large toolbox for the manipulation of nanoscale forces. [ 9 ] The structure of this article is as Magnetic fi eld imaging in living specimens with magnetic nanoparticles as contrasting agents has attracted signifi cant interest in the rapidly developing fi eld of nanomedicine. Developments in this fi eld ...

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Section: Assembly and Manipulation Of Mixed Systems Of Magnetic And Nmentioning

confidence: 99%

Section: Assembly and Manipulation Of Mixed Systems Of Magnetic And Nmentioning

confidence: 99%

Nanostructured Soft Matter with Magnetic Nanoparticles

Tokarev

Yatvin

Trotsenko

et al. 2016

Adv Funct Materials

Self Cite

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“…The formation of these anisotropic structures is essential in certain applications but is detrimental in other applications. In nanofabrication applications and in responsive materials, assembly is essential. Another example in which assembly is essential is magnetophoresis (the transport of magnetic particles induced by a magnetic gradient), which is the principle behind the magnetic separation step in applications such as protein purification or pollutant removal.…”

Section: Introductionmentioning

confidence: 99%

Predicting the Self‐Assembly of Superparamagnetic Colloids under Magnetic Fields

Faraudo

Andreu

Calero

et al. 2016

Adv Funct Materials

109

114

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Self‐assembly processes are very important in material sciences but are particularly difficult to predict quantitatively. This is the case for particulate magnetic materials in which field‐induced self‐assembly processes are essential. This article describes the recent advances in the development of predictive theoretical tools for the study of directed self‐assembly of superparamagnetic colloids under magnetic fields. A practical view is presented of how to employ the new concepts (derived from thermodynamic theory) to predict the possible assembled structures from the properties of the colloids and thermodynamic conditions. Quantitative prediction of kinetics is also discussed for the cases in which equilibrium theory is not relevant. Finally, an outline of fundamental aspects of the theory is presented.

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“…[230][231][232] It typically involves two oppositely charged materials (e.g., a positively charged polymer and a negatively charged colloidal nanomaterial) with one adsorbed on the substrate first, and then the other adsorbed on top of the first layer following rinsing. [235] Instead, alternating-current (AC) electric fields are more practical for orienting 1D nanomaterials based on their induced dipole moments. The rinsing step between layers is effective in removing loosely bound materials and thus improving the film uniformity, although in some cases, rinsing is not required if the materials can be precisely dispatched.…”

Section: Assisted Assembly Methodsmentioning

confidence: 99%

“…Alignment by magnetic field is less commonly used for electronic applications since prior attachment of magnetic nanoparticles to nonmagnetic nanomaterials are usually required for effective alignment. [235] Instead, alternating-current (AC) electric fields are more practical for orienting 1D nanomaterials based on their induced dipole moments. [236][237][238] This phenomenon, known as dielectrophoresis, is used to densely align SWCNTs or nanowires in an inhomogeneous electric field formed between a pair of planar microelectrodes.…”

Section: Assisted Assembly Methodsmentioning

confidence: 99%

Assembly and Electronic Applications of Colloidal Nanomaterials

2016

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Artificial solids and thin films assembled from colloidal nanomaterials give rise to versatile properties that can be exploited in a range of technologies. In particular, solution-based processes allow for the large-scale and low-cost production of nanoelectronics on rigid or mechanically flexible substrates. To achieve this goal, several processing steps require careful consideration, including nanomaterial synthesis or exfoliation, purification, separation, assembly, hybrid integration, and device testing. Using a ubiquitous electronic device - the field-effect transistor - as a platform, colloidal nanomaterials in three electronic material categories are reviewed systematically: semiconductors, conductors, and dielectrics. The resulting comparative analysis reveals promising opportunities and remaining challenges for colloidal nanomaterials in electronic applications, thereby providing a roadmap for future research and development.

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Magnetic field assisted assembly of highly ordered percolated nanostructures and their application for transparent conductive thin films

Cited by 36 publications

References 52 publications

Nanostructured Soft Matter with Magnetic Nanoparticles

Nanostructured Soft Matter with Magnetic Nanoparticles

Predicting the Self‐Assembly of Superparamagnetic Colloids under Magnetic Fields

Assembly and Electronic Applications of Colloidal Nanomaterials

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