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Photodetachable Adhesion EI PubMed SCIE
期刊论文 | 2019 , 31 (6) | Advanced Materials
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Abstract :

Peeling from strong adhesion is hard, and sometimes painful. Herein, an approach is described to achieve both strong adhesion and easy detachment. The latter is triggered, on-demand, through an exposure to light of a certain frequency range. The principle of photodetachable adhesion is first demonstrated using two hydrogels as adherends. Each hydrogel has a covalent polymer network, but does not have functional groups for bonding, so that the two hydrogels by themselves adhere poorly. The two hydrogels, however, adhere strongly when an aqueous solution of polymer chains is spread on the surfaces of the hydrogels and is triggered to form a stitching polymer network in situ, in topological entanglement with the pre-existing polymer networks of the two hydrogels. The two hydrogels detach easily when the stitching polymer network is so functionalized that it undergoes a gel–sol transition in response to a UV light. For example, two pieces of alginate–polyacrylamide hydrogels achieve adhesion energies about 1400 and 10 J m−2, respectively, before and after the UV radiation. Experiments are conducted to study the physics and chemistry of this strong and photodetachable adhesion, and to adhere and detach various materials, including hydrogels, elastomers, and inorganic solids. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keyword :

Adhesion energy Frequency ranges Functionalized Inorganic solids Polyacrylamide hydrogels Polymer chains Polymer networks Topological entanglement

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GB/T 7714 Gao, Yang , Wu, Kangling , Suo, Zhigang . Photodetachable Adhesion [J]. | Advanced Materials , 2019 , 31 (6) .
MLA Gao, Yang 等. "Photodetachable Adhesion" . | Advanced Materials 31 . 6 (2019) .
APA Gao, Yang , Wu, Kangling , Suo, Zhigang . Photodetachable Adhesion . | Advanced Materials , 2019 , 31 (6) .
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Rapid Programmable Nanodroplet Motion on a Strain-Gradient Surface SCIE
期刊论文 | 2019 , 35 (7) , 2865-2870 | LANGMUIR
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Abstract :

When a nanodroplet is placed on a lattice surface, an inhomogeneous surface strain field perturbs the balance of van der Waals force between the nanodroplet and surface, thus providing a net driving force for nanodroplet motion. Using molecular dynamics and theoretical analysis, we study the effect of strain gradient on modulating the movement of a nanodroplet. Both modeling and simulation show that the driving force is opposite to the direction of strain gradient, with a magnitude that is proportional to the strain gradient as well as nanodroplet size. Two representative surfaces, graphene and copper (111) plane, are exemplified to demonstrate the controllable motion of the nanodroplet. When the substrate undergoes various types of reversible deformations, multiple motion modes of nanodroplets can be feasibly achieved, including acceleration, deceleration, and turning, becoming a facile strategy to manipulate nanodroplets along a designed two-dimensional pathway.

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GB/T 7714 Zhang, Baidu , Liao, Xiangbiao , Chen, Youlong et al. Rapid Programmable Nanodroplet Motion on a Strain-Gradient Surface [J]. | LANGMUIR , 2019 , 35 (7) : 2865-2870 .
MLA Zhang, Baidu et al. "Rapid Programmable Nanodroplet Motion on a Strain-Gradient Surface" . | LANGMUIR 35 . 7 (2019) : 2865-2870 .
APA Zhang, Baidu , Liao, Xiangbiao , Chen, Youlong , Xiao, Hang , Ni, Yong , Chen, Xi . Rapid Programmable Nanodroplet Motion on a Strain-Gradient Surface . | LANGMUIR , 2019 , 35 (7) , 2865-2870 .
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Vibration Analysis of Composite Beams with Sinusoidal Periodically Varying Interfaces SCIE Scopus
期刊论文 | 2018 , 73 (1) , 57-67 | ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
WoS CC Cited Count: 1
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Abstract :

As an increasing variety of composite materials with complex interfaces are emerging, we develop a theory to investigate composite beams and shed some light on new physical insights into composite beams with sinusoidal periodically varying interfaces. For the natural vibration of composite beams with continuous or periodically varying interfaces, the governing equation has been derived according to the generalised Hamiltonian principle. For composite beams having different boundary conditions, we transform the governing equations into integral equations and solve them by using the sinusoidal functions as test functions as well as the basis of the vibration modes. Due to the orthogonality of the sinusoidal functions, expansion coefficients in closed form can be found. Therefore, the proposed iterative schemes, with the help of the Rayleigh quotient and boundary functions, can quickly find the eigenvalues and free vibration modes. The obtained natural frequencies agree well with those obtained using the finite element method. In addition, the proposed method can be extended easily to laminated composite beams in more general cases or complex components and geometries in vibration engineering. The effects of different material properties of the upper and lower components and varying interface geometry function on the frequency of the composite beams are examined. According to our investigation, the natural frequency of a laminated beam with a continuous or periodically varying interface can be changed by altering the density or elastic modulus. We also show the responses of the frequencies of the components to the varying periodic interface.

Keyword :

Bernoulli-Euler Composite Beam Distinct Material Properties Natural Frequencies Iterative Scheme Boundary Functions

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GB/T 7714 Li, Botong , Liu, Chein-Shan , Zhu, Liangliang . Vibration Analysis of Composite Beams with Sinusoidal Periodically Varying Interfaces [J]. | ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES , 2018 , 73 (1) : 57-67 .
MLA Li, Botong et al. "Vibration Analysis of Composite Beams with Sinusoidal Periodically Varying Interfaces" . | ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES 73 . 1 (2018) : 57-67 .
APA Li, Botong , Liu, Chein-Shan , Zhu, Liangliang . Vibration Analysis of Composite Beams with Sinusoidal Periodically Varying Interfaces . | ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES , 2018 , 73 (1) , 57-67 .
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Measurement of Interfacial Fracture Toughness of Surface Coatings Using Pulsed-Laser-Induced Ultrasonic Waves EI SCIE Scopus
期刊论文 | 2018 , 37 (1) | JOURNAL OF NONDESTRUCTIVE EVALUATION
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

This research develops a new technique for the measurement of interfacial fracture toughness of films/surface coatings using laser-induced ultrasonic waves. Using pulsed laser ablation on the bottom substrate surface, strong stress waves are generated leading to interfacial fractures and coating delamination. Simultaneously, a laser ultrasonic interferometer is used to measure the normal (out-of-plane) displacement of the top surface coating in order to detect coating delamination in a non-destructive manner. We can thus determine the critical laser energy for delamination, yielding the critical stress (that is, the interfacial strength). Subsequently, to examine the interfacial fracture toughness, additional pulsed laser irradiation is applied to a pre-delaminated specimen to show that the delamination area expands. This type of interfacial crack growth can be visualized using laser ultrasonic scanning. Furthermore, the calculation of elastic wave propagation was carried out using a finite-difference time-domain method) in order to accurately estimate the interfacial stress field. In this calculation, the stress distribution around the initial delamination is calculated to obtain the stress intensity factor. Based on the experimental and computational results, interfacial fracture toughness can be quantitatively evaluated. Since this technique relies on a two-laser system in a non-contact approach, it may be useful for a quantitative evaluation of adhesion/bonding quality (including both interfacial fracture strength and toughness) in various environments.

Keyword :

Surface coating Interfacial fracture toughness Delamination Pulsed-laser-induced ultrasonic wave

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GB/T 7714 Watanabe, Yousuke , Yonezu, Akio , Chen, Xi . Measurement of Interfacial Fracture Toughness of Surface Coatings Using Pulsed-Laser-Induced Ultrasonic Waves [J]. | JOURNAL OF NONDESTRUCTIVE EVALUATION , 2018 , 37 (1) .
MLA Watanabe, Yousuke et al. "Measurement of Interfacial Fracture Toughness of Surface Coatings Using Pulsed-Laser-Induced Ultrasonic Waves" . | JOURNAL OF NONDESTRUCTIVE EVALUATION 37 . 1 (2018) .
APA Watanabe, Yousuke , Yonezu, Akio , Chen, Xi . Measurement of Interfacial Fracture Toughness of Surface Coatings Using Pulsed-Laser-Induced Ultrasonic Waves . | JOURNAL OF NONDESTRUCTIVE EVALUATION , 2018 , 37 (1) .
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Effect of Degassing on the Stability and Reversibility of Glycerol/ZSM-5 Zeolite System SCIE Scopus
期刊论文 | 2018 , 8 (7) | APPLIED SCIENCES-BASEL
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Gaseous phase plays roles in a liquid/nanoporous system during application that adequate attention should be paid to the gaseous effects and the nanoscale gas-liquid interaction. In the present study, two glycerol/ZSM-5 zeolite systems with different amount of residual gas are compared by performing a series of experiments. Influences of loading rate, as well as system temperature on the gas-liquid interactions, are studied. Results show that vacuum degassing pretreatment is required to obtain a reversible and stable energy absorption system. Moreover, the influence of gas on a liquid/nanoporous system is found to mainly act on the liquid outflow. After the routine vacuum degassing pretreatment, the residual air that is left in the nanopores is around 0.9014 nm(-3) per unit specific pore volume, as presented in the current study. During compression, the existing gas left in the nanochannel tends to gather into the gas cluster, which further promotes the liquid outflow during unloading. However, excessively dissolved gas may reduce the driving force for liquid outflow by breaking the continuity of the liquid molecular chain in nanochannel. Consequently, small bubbles as a labile factor in the system must be excluded for the steady use of the system. This work sheds some light on the effect of the amount of residual gas on the liquid/nanoporous system and gives guidance on the pretreatment of the liquid/nanoporous material mixture before encapsulating.

Keyword :

liquid/nanoporous material system degassing pretreatment liquid outflow gas amount liquid-gas interaction

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GB/T 7714 Zhang, Yafei , Luo, Rui , Zhou, Qulan et al. Effect of Degassing on the Stability and Reversibility of Glycerol/ZSM-5 Zeolite System [J]. | APPLIED SCIENCES-BASEL , 2018 , 8 (7) .
MLA Zhang, Yafei et al. "Effect of Degassing on the Stability and Reversibility of Glycerol/ZSM-5 Zeolite System" . | APPLIED SCIENCES-BASEL 8 . 7 (2018) .
APA Zhang, Yafei , Luo, Rui , Zhou, Qulan , Chen, Xi , Dou, Yihua . Effect of Degassing on the Stability and Reversibility of Glycerol/ZSM-5 Zeolite System . | APPLIED SCIENCES-BASEL , 2018 , 8 (7) .
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Unconventional localization prior to wrinkles and controllable surface patterns of film/substrate bilayers through patterned cavities EI Scopus SCIE
期刊论文 | 2018 , 25 , 66-70 | Extreme Mechanics Letters
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Abstract :

© 2018 Elsevier Ltd Wrinkle formation followed by sharp strain localization is commonly observed in compressed stiff film/soft substrate systems. However, cavities or defects beneath the film may directly trigger the formation of local ridges and then folding configurations at a relatively small compressive strain, and a mixture of wrinkles and folds upon further compression. The morphological transition is different than those of defect-free substrates. Numerical simulations of continuously compressed bilayer with pre-patterned cavities are carried out to elucidate the transition mechanism of surface patterns. Parallel experiments of cavities-patterned bilayer prototypes by 3D-printing are also performed to validate the findings in simulations. A rich diversity of periodic surface topologies, including overall spreading waves, localizations, saw-like and co-existing features of folds and wrinkles can be obtained by varying the diameter, depth and spacing of cavities, which provides a potential approach to engineer various surface patterns for applications.

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GB/T 7714 Liao, Xiangbiao , Chen, Youlong , Nagakura, Takumi et al. Unconventional localization prior to wrinkles and controllable surface patterns of film/substrate bilayers through patterned cavities [J]. | Extreme Mechanics Letters , 2018 , 25 : 66-70 .
MLA Liao, Xiangbiao et al. "Unconventional localization prior to wrinkles and controllable surface patterns of film/substrate bilayers through patterned cavities" . | Extreme Mechanics Letters 25 (2018) : 66-70 .
APA Liao, Xiangbiao , Chen, Youlong , Nagakura, Takumi , Zhu, Liangliang , Li, Mingjia , Shi, Xiaoyang et al. Unconventional localization prior to wrinkles and controllable surface patterns of film/substrate bilayers through patterned cavities . | Extreme Mechanics Letters , 2018 , 25 , 66-70 .
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Structural and elastic properties of CaMg2 Laves phase by Y-parameter and Reuss-Voigt-Hill methods EI
会议论文 | 2018 , 423 (1) | 2018 4th International Conference on Applied Materials and Manufacturing Technology, ICAMMT 2018
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Abstract :

Structural, mechanical properties of CaMg2 Laves phase are investigated by the first-principle calculations and then the homogenized moduli are calculated by both the classical Reuss-Voigt-Hill estimation and a so-called Y parameter. Above all, the optimized crystal parameters are in very good agreement with the experimental data reported. Besides, elastic constants Cij are calculated, thus the shear modulus, bulk modulus, Young's modulus, Poisson's ratio are calculated to compare with the relative data in references. Contrary to Hill approach, the Y parameter enables to investigate the anisotropic characteristics and isotropic elastic properties of CaMg2 structure. By using Y parameter, we can see that Young's modulus and Poisson's ratio as a function of the compliance coefficient Sij (or elastic constants Cij) and plane orientation are distributed within a reasonable range, which are useful for the DFT study of similar hexagonal crystal structure at nanoscale. © 2018 Institute of Physics Publishing. All rights reserved.

Keyword :

Crystal parameters Elastic properties First principle calculations Hexagonal crystal structure Laves-phase Nano scale Plane orientation Y-parameters

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GB/T 7714 Fu, Jia , Guo, Jukui , Bai, Hao et al. Structural and elastic properties of CaMg2 Laves phase by Y-parameter and Reuss-Voigt-Hill methods [C] . 2018 .
MLA Fu, Jia et al. "Structural and elastic properties of CaMg2 Laves phase by Y-parameter and Reuss-Voigt-Hill methods" . (2018) .
APA Fu, Jia , Guo, Jukui , Bai, Hao , Lin, Weihui . Structural and elastic properties of CaMg2 Laves phase by Y-parameter and Reuss-Voigt-Hill methods . (2018) .
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Tunable surface morphology via patterned cavities in soft materials SCIE
期刊论文 | 2018 , 98 (6) | PHYSICAL REVIEW E
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There is a rich diversity of surface topologies controllably engineered by patterning cavities embedded beneath the surface of soft materials. Upon external compression, the surface undergoes the reversible transformation from the flat surface to various surface topographies, including a periodic checkerboard pattern with alternate convex and concave features. To design the surface features, both two- (2D) and three-dimensional (3D) finite element based simulations are performed. It is demonstrated that the periodic surface features with controllable morphology, such as one-dimensional waves, checkerboard pattern, and mutually perpendicular apexes, etc., can be realized through varying cavity geometries (e.g., relative intercavity distance, shapes, and biaxial or uniaxial load). Additionally, a simple model for plate buckling is used to elucidate the effect of cavity aspect ratio on the surface pattern. Based on 3D printed prototypes, we further conduct experiments to validate the simulation results of 2D morphologies. The patterned cavities in soft materials make designing a variety of reversible surface features possible, offering an effective fabrication approach for wide application across multiple scales.

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GB/T 7714 Liao, Xiangbiao , Nagakura, Takumi , Chen, Youlong et al. Tunable surface morphology via patterned cavities in soft materials [J]. | PHYSICAL REVIEW E , 2018 , 98 (6) .
MLA Liao, Xiangbiao et al. "Tunable surface morphology via patterned cavities in soft materials" . | PHYSICAL REVIEW E 98 . 6 (2018) .
APA Liao, Xiangbiao , Nagakura, Takumi , Chen, Youlong , Zhu, Liangliang , Shi, Xiaoyang , Yonezu, Akio et al. Tunable surface morphology via patterned cavities in soft materials . | PHYSICAL REVIEW E , 2018 , 98 (6) .
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Collective dynamics of cancer cells confined in a confluent monolayer of normal cells EI SCIE PubMed Scopus
期刊论文 | 2017 , 52 , 140-147 | JOURNAL OF BIOMECHANICS | IF: 2.431
WoS CC Cited Count: 8 SCOPUS Cited Count: 8
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Tumorigenesis often involves specific changes in cell motility and intercellular adhesion. Understanding the collective cancer cell behavior associated with these specific changes could facilitate the detection of malignant characteristics during tumor growth and invasion. In this study, a cellular vertex model is developed to investigate the collective dynamics of a disk-like aggregate of cancer cells confined in a confluent monolayer of normal cells. The effects of intercellular adhesion and cell motility on tumor progression are examined. It is found that the stresses in both the cancer cells and the normal cells increase with tumor growth, resulting in a crowded environment and enhanced cell apoptosis. The intercellular adhesion between cancer cells and normal cells is revealed to promote tumor growth and invasion. The tumor invasion dynamics hinges on the motility of cancer cells. The cancer cells could orchestrate into different collective migration modes, e.g., directional migration and rotational oscillations, dictated by the competition between cell persistence and local coordination. Phase diagrams are established to reveal the competitive mechanisms. This work highlights the role of mechanics in regulating tumor growth and invasion. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Collective cellular dynamics Cell motility Cancer invasion Tumor growth

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GB/T 7714 Lin, Shao-Zhen , Li, Bo , Xu, Guang-Kui et al. Collective dynamics of cancer cells confined in a confluent monolayer of normal cells [J]. | JOURNAL OF BIOMECHANICS , 2017 , 52 : 140-147 .
MLA Lin, Shao-Zhen et al. "Collective dynamics of cancer cells confined in a confluent monolayer of normal cells" . | JOURNAL OF BIOMECHANICS 52 (2017) : 140-147 .
APA Lin, Shao-Zhen , Li, Bo , Xu, Guang-Kui , Feng, Xi-Qiao . Collective dynamics of cancer cells confined in a confluent monolayer of normal cells . | JOURNAL OF BIOMECHANICS , 2017 , 52 , 140-147 .
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Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method EI SCIE Scopus
期刊论文 | 2017 , 105 , 90-101 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | IF: 3.891
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A particle-based meshless method, the moving particle semi-implicit (MPS) method, is employed in this study to simulate the process of liquid film breakup and atomization in a rotary atomizer. The computational framework incorporates a specially designed inlet flow model, a centrifugal force calculation, and a surface tension model to allow the simulation of the unsteady flow with extreme deformations. To improve efficiency, the searching algorithm of the MPS method is modified by eliminating redundant calculations. The computational framework is further utilized to systematically study the transition of the liquid from the bulk phase to a film, then to multiple belts, and finally to numerous droplets under the low pressure and flow rate conditions in the rotary atomization. Key mass transfer mechanisms underlying the atomization process are elucidated by a comprehensive analysis of the flow trajectories. The computational work is expected to improve the fundamental understanding of the rotary atomization process and facilitate future process optimization efforts. (C) 2016 Elsevier Ltd. All rights reserved.

Keyword :

Moving particle semi-implicit method Mixture Computational efficiency Atomization Rotary atomizer

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GB/T 7714 Sun, Zhongguo , Chen, Xiao , Xi, Guang et al. Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2017 , 105 : 90-101 .
MLA Sun, Zhongguo et al. "Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 105 (2017) : 90-101 .
APA Sun, Zhongguo , Chen, Xiao , Xi, Guang , Liu, Ling , Chen, Xi . Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2017 , 105 , 90-101 .
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