Functionalization of Metallic Glasses through Hierarchical Patterning

Hasan, Molla; Schroers, Jan; Kumar, Golden

doi:10.1021/nl504694s

Cited by 105 publications

(68 citation statements)

References 78 publications

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“…This phenomenon has lately been utilized in a variety of micro-to nano-meter-scale applications, which can combine multiple length scale features in one component with easiness and precision via a thermoplastic forming (TPF) process [16,17]. The intrinsic properties in BMGs (i.e., dramatic decrease in viscosity and increase in the formability at high temperatures) enhance the competitiveness of different TPF-based amorphous alloy processing within the commercial production routes [18].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Structural Investigation of Porous Bulk Metallic Glasses

Sarac

Şopu

Park

et al. 2015

Metals

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Abstract:The intrinsic properties of advanced alloy systems can be altered by changing their microstructural features. Here, we present a highly efficient method to produce and characterize structures with systematically-designed pores embedded inside. The fabrication stage involves a combination of photolithography and deep reactive ion etching of a Si template replicated using the concept of thermoplastic forming. Pt-and Zr-based bulk metallic glasses (BMGs) were evaluated through uniaxial tensile test, followed by scanning electron microscope (SEM) fractographic and shear band analysis. Compositional investigation of the fracture surface performed via energy dispersive X-ray spectroscopy (EDX), as well as Auger spectroscopy (AES) shows a moderate amount of interdiffusion (5 at.% maximum) of the constituent elements between the deformed and undeformed regions. Furthermore, length-scale effects on the mechanical behavior of porous BMGs were explored through molecular dynamics (MD) simulations, where shear band formation is observed for a material width of 18 nm. OPEN ACCESSMetals 2015, 5 921

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Section: Introductionmentioning

confidence: 99%

Mechanical and Structural Investigation of Porous Bulk Metallic Glasses

Sarac

Şopu

Park

et al. 2015

Metals

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“…Future studies that incorporate the proposed tool with such systems will improve the accuracy of experimental findings in these fields. Examples for such fields include processes such as Marangoni flows where controlling the vapors of the volatile component is essential [50], for system that require careful drying as in the case of phospholipid films [51], or for systems that consider solid liquid interactions in which the humidity needs to be controlled as in concrete-water interactions [52] or interactions of water with hydrophobic microstructures [53], or any other system that consider small volumes of volatile components [33,[54][55][56][57][58][59][60][61][62][63]. …”

Section: Discussionmentioning

confidence: 99%

Controlling arbitrary humidity without convection

Wasnik

N’guessan

Tadmor

2015

Journal of Colloid and Interface Science

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In this paper we show a way that allows for the first time to induce arbitrary humidity of desired value for systems without convective flow. To enable this novelty we utilize a semi-closed environment in which evaporation is not completely suppressed. In this case, the evaporation rate is determined both by the outer (open) humidity and by the inner (semi-closed) geometry including the size/shape of the evaporating medium and the size/shape of the semi-closure. We show how such systems can be used to induce desired humidity conditions. We consider water droplet placed on a solid surface and study its evaporation when it is surrounded by other drops, hereon "satellite" drops and covered by a semi-closed hemisphere. The main drop's evaporation rate is proportional to its height, in agreement with theory. Surprisingly, however, the influence of the satellite drops on the main drop's evaporation suppression is not proportional to the sum of heights of the satellite drops. Instead, it shows proportionality close to the satellite drops' total surface area. The resultant humidity conditions in the semi-closed system can be effectively and accurately induced using different satellite drops combinations.

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“…When compared to existing methods for producing multiscale nanopatterned metals, such as laser ablation 12,13 and formable systems, including consecutive imprinting 39 or imprinting and photolithography 40 , the principle benefits of the technique described here, beyond the ability to tune the morphology, are the low cost and facile nature by which multiscale patterning is enabled. The ability to produce complexly shaped 3D architectures while maintaining the surface structure with high fidelity leads to immense flexibility; it allows for texturing within a superstructure that is defined by a structured micromold.…”

Section: Generating 3d Hierarchical Architecturesmentioning

confidence: 99%

Multiscale patterning of a metallic glass using sacrificial imprint lithography

et al. 2015

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Bulk metallic glasses (BMGs) have been developed as a means to achieve durable multiscale, nanotextured surfaces with desirable properties dictated by topography for a multitude of applications. One barrier to this achievement is the lack of a bridging technique between macroscale thermoplastic forming and nanoimprint lithography, which arises from the difficulty and cost of generating controlled nanostructures on complex geometries using conventional top-down approaches. This difficulty is compounded by the necessary destruction of any resulting reentrant structures during rigid demolding. We have developed a generalized method to overcome this limitation by sacrificial template imprinting using zinc oxide (ZnO) nanostructures. It is established that such structures can be grown inexpensively and quickly with tunable morphologies on a wide variety of substrates out of solution, which we exploit to generate the nanoscale portion of the multiscale pattern through this bottom-up approach. In this way, we achieve metallic structures that simultaneously demonstrate features from the macroscale down to the nanoscale, requiring only the top-down fabrication of macro/microstructured molds. Upon detachment of the formed part from the multiscale molds, the ZnO remains embedded in the surface and can be removed by etching in mild conditions to both regenerate the mold and render the surface of the BMGs nanoporous. The ability to pattern metallic surfaces in a single step on length scales from centimeters down to nanometers is a critical step toward fabricating devices with complex shapes that rely on multiscale topography for their intended functions, such as biomedical and electrochemical applications.

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Functionalization of Metallic Glasses through Hierarchical Patterning

Cited by 105 publications

References 78 publications

Mechanical and Structural Investigation of Porous Bulk Metallic Glasses

Mechanical and Structural Investigation of Porous Bulk Metallic Glasses

Controlling arbitrary humidity without convection

Multiscale patterning of a metallic glass using sacrificial imprint lithography

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