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Drying-induced bifurcation in a hydrogel-actuated nanostructure

Submitted by Taher A Saif on
research
gels

Fascinating paper. Congrats to Wei, Xuanhe, and Zhigang. Nice to see a simple and an elegant model together with an intuitively appealing physical interpretation of the bifurcation phenomenon in gels. It woud be interesting to see the time evolution of the drying process and the orientation (theta) of the nano wires.  

Nikolaos I.Ioakimidis _introduce hypersingular integral equations into 3D fracture mechanics

Submitted by BoJing Zhu on
research

N.I.Ioakimidis.1982.Application of finite-part integrals to the singular integral equations of crack problems in plane and three-dimensional elasticity. Acta Mechanica.45. 31-47.

N.I.Ioakimidis.1983. A new singular integral equation for the classical crack problem in plane and antiplane elasticity. Int J fracture. 21. 115-122

Inhomogeneous and anisotropic equilibrium state of a swollen hydrogel containing a hard core

Submitted by Xuanhe Zhao on
research
suo group research
hydrogel
gel
core-shell

A polymer network can imbibe water from environment and swell to an equilibrium state. If the equilibrium is reached when the network is subject to external mechanical constraint, the deformation of the network is typically anisotropic, and the concentration of water inhomogeneous.  Such an equilibrium state in a network constrained by a hard core is modeled here with a nonlinear differential equation.  The presence of the hard core markedly reduces the concentration of water near the interface and causes high stresses.

DYNAMICS

Submitted by sammedkumar patil on
research
mass and spring

what is the need to model a dynamic system , like a structure under vibration (consider), by using mass and spring model only is there any alternative way of doing i think we can do it by using electronic filters , but not so deep idea i have about that, so this is my research work , i wanted to clarify this big uestion of mine as soon as possible.

 

Drying-induced bifurcation in a hydrogel-actuated nanostructure

Submitted by Wei Hong on
research
suo group research
hydrogel
gel

Hydrogels have enormous potential for making adaptive structures in response to diverse stimuli.  In a structure demonstrated recently, for example, nanoscale rods of silicon were embedded vertically in a swollen hydrogel, and the rods tilted by a large angle in response to a drying environment (Sidorenko, et al., Science 315, 487, 2007).  Here we describe a model to show that this behavior corresponds to a bifurcation at a critical humidity, analogous to a phase transition of the second kind.

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