Multi-scale mechanics and electrical transport in a free-standing 3D architecture of graphene and carbon nanotubes fabricated by pressure assisted welding

Nautiyal, Pranjal; Embrey, Leslie; Boesl, Benjamin; Agarwal, Arvind

doi:10.1016/j.carbon.2017.06.081

Cited by 26 publications

(16 citation statements)

References 69 publications

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“…In contrast, although the isotropic graphite has harder grains, it also has more segregated free volumes (i.e., voids), which cannot hinder sliding of the graphite grains, leading to lower hardness. The hardness of the graphenic glass is also higher than otherwise densified graphene materials including graphene-CNT hybrid solid made by pressure assisted welding 44 , and is comparable to that of the bulk graphene nanoplatelets fabricated by spark plasma sintering 45 . Dense graphene monoliths can be obtained from hydrogels made from hydrothermal reactions, and their size and shape are limited by the volume and shape of the hydrothermal reactors 46–48 .…”

Section: Resultsmentioning

confidence: 86%

Binder-free graphene oxide doughs

et al. 2019

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Graphene oxide (GO) sheets have been used to construct various bulk forms of GO and graphene-based materials through solution-based processing techniques. Here, we report a highly cohesive dough state of GO with tens of weight percent loading in water without binder-like additives. The dough state can be diluted to obtain gels or dispersions, and dried to yield hard solids. It can be kneaded without leaving stains, readily reshaped, connected, and further processed to make bulk GO and graphene materials of arbitrary form factors and tunable microstructures. The doughs can be transformed to dense glassy solids of GO or graphene without long-range stacking order of the sheets, which exhibit isotropic and much enhanced mechanical properties due to hindered sliding between the sheets. GO dough is also found to be a good support material for electrocatalysts as it helps to form compliant interface to access the active particles.

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Section: Resultsmentioning

confidence: 86%

Binder-free graphene oxide doughs

et al. 2019

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“…Besides, D‐MXM shows superior mechanical properties as measured by a Hysitron nanoindenter equipped with a Berkovich tip (Figure S10, Supporting Information). An average of ten measurements at various sites gave Young's modulus and hardness values of 15 and 0.7 GPa which are higher than those of carbon‐based monoliths such as graphene/carbon nanotubes (6.5 and 0.18), 3D nanographene (0.3–1 and 0.02–0.1), graphene oxide composites (1.1 and 1.2 × 10 −3 ), 3D graphene foam (1.2 × 10 −3 –1.5 × 10 −3 and 9.1 × 10 −5 –2.6 × 10 −5 ) etc. The Young's modulus was also tested by a resonant ultrasound spectrometer (UMS‐100) and a similar result (12.8 GPa) was obtained.…”

Section: Resultsmentioning

confidence: 91%

3D Macroscopic Architectures from Self‐Assembled MXene Hydrogels

Shang

Lin

et al. 2019

Adv Funct Materials

422

295

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Assembly of 2D MXene sheets into a 3D macroscopic architecture is highly desirable to overcome the severe restacking problem of 2D MXene sheets and develop MXene-based functional materials. However, unlike graphene, 3D MXene macroassembly directly from the individual 2D sheets is hard to achieve for the intrinsic property of MXene. Here a new gelation method is reported to prepare a 3D structured hydrogel from 2D MXene sheets that is assisted by graphene oxide and a suitable reductant. As a supercapacitor electrode, the hydrogel delivers a superb capacitance up to 370 F g −1 at 5 A g −1 , and more promisingly, demonstrates an exceptionally high rate performance with the capacitance of 165 F g −1 even at 1000 A g −1 . Moreover, using controllable drying processes, MXene hydrogels are transformed into different monoliths with structures ranging from a loosely organized porous aerogel to a dense solid. As a result, a 3D porous MXene aerogel shows excellent adsorption capacity to simultaneously remove various classes of organic liquids and heavy metal ions while the dense solid has excellent mechanical performance with a high Young's modulus and hardness.

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“…The recent advent of in situ mechanical testing techniques has opened up a whole new gamut of nanomechanical characterizations . The in situ techniques involve mechanical testing of materials inside a high‐resolution microscope, allowing real‐time observation of deformation behavior.…”

Section: Summary and Future Directionsmentioning

confidence: 99%

The Role of Nanomechanics in Healthcare

Nautiyal

Alam

Balani

et al. 2017

Adv Healthcare Materials

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Nanomechanics has played a vital role in pushing our capability to detect, probe, and manipulate the biological species, such as proteins, cells, and tissues, paving way to a deeper knowledge and superior strategies for healthcare. Nanomechanical characterization techniques, such as atomic force microscopy, nanoindentation, nanotribology, optical tweezers, and other hybrid techniques have been utilized to understand the mechanics and kinetics of biospecies. Investigation of the mechanics of cells and tissues has provided critical information about mechanical characteristics of host body environments. This information has been utilized for developing biomimetic materials and structures for tissue engineering and artificial implants. This review summarizes nanomechanical characterization techniques and their potential applications in healthcare research. The principles and examples of label-free detection of cancers and myocardial infarction by nanomechanical cantilevers are discussed. The vital importance of nanomechanics in regenerative medicine is highlighted from the perspective of material selection and design for developing biocompatible scaffolds. This review interconnects the advancements made in fundamental materials science research and biomedical technology, and therefore provides scientific insight that is of common interest to the researchers working in different disciplines of healthcare science and technology.

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Multi-scale mechanics and electrical transport in a free-standing 3D architecture of graphene and carbon nanotubes fabricated by pressure assisted welding

Cited by 26 publications

References 69 publications

Binder-free graphene oxide doughs

Binder-free graphene oxide doughs

3D Macroscopic Architectures from Self‐Assembled MXene Hydrogels

The Role of Nanomechanics in Healthcare

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