Search results for: Qihan Liu

Items from 1 to 9 out of 9 results

article

Ionotronic Luminescent Fibers, Fabrics, and Other Configurations

Canhui Yang, Sibo Cheng, Xi Yao, Guodong Nian, more

Advanced Materials > 32 > 47 > n/a - n/a

A family of recently developed devices, hydrogel ionotronics, uses hydrogels as ionic conductors, and uses hydrophobic elastomers as dielectrics. This development has posed a challenge: integrate hydrogels and hydrophobic elastomers—in various manufacturing processes—with strong, stretchable, and transparent adhesion. Here, a multistep dip‐coating process is described to enable hydrogel ionotronics...

article

Giant Poisson's Effect for Wrinkle‐Free Stretchable Transparent Electrodes

Yan Wang, Qihan Liu, Jianming Zhang, Tianzeng Hong, more

Advanced Materials > 31 > 35 > n/a - n/a

The next generation of flexible electronics will require highly stretchable and transparent electrodes, many of which consist of a relatively stiff metal network (or carbon materials) and an underlying soft substrate. Typically, such a stiff–soft bilayer suffers from wrinkling or folding when subjected to strains, causing high surface roughness and seriously deteriorated optical transparency. In this...

article

Mussel-inspired 3D fiber scaffolds for heart-on-a-chip toxicity studies of engineered nanomaterials

Seungkuk Ahn, Herdeline Ann M. Ardoña, Johan U. Lind, Feyisayo Eweje, more

Analytical and Bioanalytical Chemistry > 2018 > 410 > 24 > 6141-6154

Due to the unique physicochemical properties exhibited by materials with nanoscale dimensions, there is currently a continuous increase in the number of engineered nanomaterials (ENMs) used in consumer goods. However, several reports associate ENM exposure to negative health outcomes such as cardiovascular diseases. Therefore, understanding the pathological consequences of ENM exposure represents...

article

Extrusion, slide, and rupture of an elastomeric seal

Zhengjin Wang, Chao Chen, Qihan Liu, Yucun Lou, more

Journal of the Mechanics and Physics of Solids > 2017 > 99 > C > 289-303

Elastomeric seals are essential to two great technological advances in oilfields: horizontal drilling and hydraulic fracturing. This paper describes a method to study elastomeric seals by using the pressure-extrusion curve (i.e., the relation between the drop of pressure across a seal and the volume of extrusion of the elastomer). Emphasis is placed on a common mode of failure found in oilfields:...

article

Shear, dilation, and swap: Mixing in the limit of fast diffusion

Laurence Brassart, Qihan Liu, Zhigang Suo

Journal of the Mechanics and Physics of Solids > 2016 > 96 > C > 48-64

Molecules of different species mix by local rearrangement and long-range migration. Under certain conditions, the molecules are partially jammed: they rearrange slowly, but migrate fast. Here we formulate a theory of mixing when the long-range migration of molecules is fast, and the local rearrangement of molecules sets the time needed for mixing. In this limit, the time needed for mixing is independent...

article

Osmocapillary phase separation

Qihan Liu, Zhigang Suo

Extreme Mechanics Letters > 2016 > 7 > Complete > 27-33

A covalent network of polymer can imbibe a solvent to form a gel. In a cavity on the surface of the gel, capillary force may suck the solvent out of the gel to form a pure liquid phase. We show that such osmocapillary phase separation occurs when capillarity balances osmosis, and when the diffusion of solvent in the gel prevails over the condensation of solvent from the vapor. Osmocapillary phase...

article

Reversible Electrochemically Triggered Delamination Blistering of Hydrogel Films on Micropatterned Electrodes

Ben B. Xu, Qihan Liu, Zhigang Suo, Ryan C. Hayward

Advanced Functional Materials > 26 > 19 > 3218 - 3225

Stimuli responsive elastic instabilities provide opportunities for controlling the structures and properties of polymer surfaces, offering a range of potential applications. Here, a surface actuator based on a temperature and electrically responsive poly(N‐isopropyl acrylamide‐co‐sodium acrylate) hydrogel that undergoes a two‐step delamination and buckling instability triggered using micropatterned...

article

Elastic leak of a seal

Qihan Liu, Zhengjin Wang, Yucun Lou, Zhigang Suo

Extreme Mechanics Letters > 2014 > 1 > Complete > 54-61

An elastomeric seal may leak by elastic deformation without any material damage. We describe elastic leak using a theoretical model, and watch a seal deform and leak using a transparent experimental setup. The elastomer seals the fluid by forming contact with surrounding hard materials. As the fluid pressure increases, the contact stress also increases but not as much. When the fluid pressure surpasses...

article

Localization of Folds and Cracks in Thin Metal Films Coated on Flexible Elastomer Foams

Hugues Vandeparre, Qihan Liu, Ivan R. Minev, Zhigang Suo, more

Advanced Materials > 25 > 22 > 3117 - 3121

Thin metal films coated on soft elastomeric foam substrates exhibit enhanced electromechanical performance. The open‐cell foam structure conveys highly anisotropic mechanical properties within the top, thin capping elastomer at the surface of the foam. Upon stretching, large strain fields inducing cracks and folds localize above the foam cells, while the surrounding cell ligaments remain almost strain‐free,...

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