scholarly journals Light-driven complex 3D shape morphing of glassy polymers by resolving spatio-temporal stress confliction

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Jong Hyeok Lee ◽  
Jun-Chan Choi ◽  
Sukyoung Won ◽  
Jae-Won Lee ◽  
Jae Gyeong Lee ◽  
...  
Keyword(s):  
Glassy Polymers ◽  
3D Shape ◽  
Shape Morphing ◽  
3D Shape Morphing ◽  
Spatio Temporal

scholarly journals Contactless reversible 4D-printing for 3D-to-3D shape morphing

2020 ◽  
Vol 15 (4) ◽  
pp. 481-495
Author(s):  
Amelia Yilin Lee ◽  
Aiwu Zhou ◽  
Jia An ◽  
Chee Kai Chua ◽  
Yi Zhang
Keyword(s):  
4D Printing ◽  
3D Shape ◽  
Shape Morphing ◽  
3D Shape Morphing

scholarly journals Reconfigurable and programmable origami dielectric elastomer actuators with 3D shape morphing and emissive architectures

2019 ◽  
Vol 11 (1) ◽  
Author(s):  
Jiangxin Wang ◽  
Shaohui Li ◽  
Dace Gao ◽  
Jiaqing Xiong ◽  
Pooi See Lee
Keyword(s):  
Light Emission ◽  
Dielectric Elastomer ◽  
Electronic Systems ◽  
Shape Morphing ◽  
Dielectric Elastomer Actuators ◽  
New Strategy ◽  
3D Shape Morphing ◽  
Soft Actuators ◽  
Local Stiffness ◽  
Shape Changes

AbstractSoft actuators with the capability to generate programmable and reconfigurable motions without the use of complicated and rigid infrastructures are of great interest for the development of smart, interactive, and adaptive soft electronic systems. Here, we report a new strategy to achieve a transparent and reconfigurable actuator by using a dielectric elastomer actuator (DEA), which provides mechanical strains under electrical bias, integrated with origami ethyl cellulose (EC) paper that “instructs” the shape changes of the actuator. The actuator can be reconfigured and multiple mechanical motions can be programmed in the device by creating crease patterns that induce variations in the local stiffness to direct the actuations. With the versatile design and fabrication approach, a light emission device with dynamic shape changes was demonstrated.

Multifunctional Three-Dimensional Curvilinear Self-Folding of Glassy Polymers

2020 ◽  
Vol 8 (3) ◽  
Author(s):  
Jae Gyeong Lee ◽  
Sukyoung Won ◽  
Jeong Eun Park ◽  
Jeong Jae Wie
Keyword(s):  
Light Absorption ◽  
Three Dimensional ◽  
Strain Engineering ◽  
Local Deformation ◽  
Glassy Polymers ◽  
Polymeric Films ◽  
Stimuli Responsive ◽  
Shape Morphing ◽  
Curvilinear Structures ◽  
External Stimuli

Abstract The selective light absorption of prestretched thermoplastic polymeric films enables wireless photothermal shape morphing from two-dimensional Euclidean geometry of films to three-dimensional (3D) curvilinear architectures. For a facile origami-inspired programming of 3D folding, black inks are printed on glassy polymers that are used as hinges to generate light-absorption patterns. However, the deformation of unpatterned areas and/or stress convolution of patterned areas hinder the creation of accurate curvilinear structures. In addition, black inks remain in the film, prohibiting the construction of transparent 3D architectures. In this study, we demonstrate the facile preparation of transparent 3D curvilinear structures with the selection of the curvature sign and chirality via the selective light absorption of detachable tapes. The sequential removal of adhesive patterns allowed sequential folding and the control of strain responsivity in a single transparent architecture. The introduction of multiple heterogeneous nonresponsive materials increased the complexity of strain engineering and functionality. External stimuli responsive kirigami-based bridge triggered the multimaterial frame to build the Gaussian curvature. Conductive material casted on the film in a pattern retained the conductivity, despite local deformation. This type of tape patterning system, adopting various materials, can achieve multifunction including transparency and conductivity.

scholarly journals 3D Shape Measurement Based on Digital Speckle Projection and Spatio-Temporal Correlation

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 552
Author(s):  
Qican Zhang ◽  
Renchao Xu ◽  
Yihang Liu ◽  
Zhenyi Chen
Keyword(s):  
Correlation Method ◽  
Temporal Correlation ◽  
Shape Measurement ◽  
Digital Speckle Correlation Method ◽  
3D Shape ◽  
3D Shape Measurement ◽  
Speckle Correlation ◽  
Digital Speckle ◽  
Spatio Temporal ◽  
Digital Speckle Correlation

With the non-periodicity and discrete nature, and unnecessary of phase unwrapping process, digital speckle correlation method shows its significant advantages in three-dimensional (3D) shape measurement. Combining with the spatial correlation and temporal correlation method in the digital speckle correlation, a spatio-temporal digital speckle correlation was developed in this paper, which can improve the accuracy of 3D shape measurement and effectively reduce the number of the recorded speckle images for restoring the corresponding 3D shape at the same time. In the experiment, only 5 frames of the required speckle images was needed to reconstruct the 3D shape of a complex object with spatio-temporal digital speckle correlation method, and its accuracy was same as the result when 20 frames speckle images were used in temporal correlation method.

Multi-Functional 3D Curvilinear Self-Folding of Glassy Polymers

2020 ◽  
Author(s):  
Jae Gyeong Lee ◽  
Sukyoung Won ◽  
Jeong Eun Park ◽  
Jeong Jae Wie
Keyword(s):  
Light Absorption ◽  
Three Dimensional ◽  
Strain Engineering ◽  
Local Deformation ◽  
Glassy Polymers ◽  
Stimuli Responsive ◽  
Responsive Materials ◽  
Shape Morphing ◽  
Curvilinear Structures ◽  
External Stimuli

Abstract The selective light absorption of pre-stretched thermoplastic polymeric films enables wireless photothermal shape morphing from two-dimensional Euclidean geometry of films to three-dimensional (3D) curvilinear architectures. For a facile origami-inspired programming of 3D folding, black inks are printed on glassy polymers that are used as hinges to generate light-absorption patterns. However, the deformation of unpatterned areas and/or stress convolution of patterned areas hinder the creation of accurate curvilinear structures. In addition, black inks remain in the film, prohibiting the construction of transparent 3D architectures. In this study, we demonstrate the facile preparation of transparent 3D curvilinear structures with the selection of the curvature sign and chirality via the selective light absorption of detachable tapes. The sequential removal of adhesive patterns allowed sequential folding and the control of strain responsivity in a single transparent architecture. The introduction of multiple heterogeneous non-responsive materials increased the complexity of strain engineering and functionality. External stimuli responsive kirigami-based bridge triggered the multi-material frame to build the Gaussian curvature. Conductive material casted on the film in a pattern retained the conductivity, despite local deformation. This type of tape patterning system, adopting various materials, can achieve multifunction including transparency and conductivity.

Practical electron tomography

1995 ◽  
Vol 53 ◽  
pp. 742-743
Author(s):  
C.L. Woodcock
Keyword(s):  
Electron Tomography ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
3D Shape ◽  
Computational Resources ◽  
Shape Of Particles

Despite the potential of the technique, electron tomography has yet to be widely used by biologists. This is in part related to the rather daunting list of equipment and expertise that are required. Thanks to continuing advances in theory and instrumentation, tomography is now more feasible for the non-specialist. One barrier that has essentially disappeared is the expense of computational resources. In view of this progress, it is time to give more attention to practical issues that need to be considered when embarking on a tomographic project. The following recommendations and comments are derived from experience gained during two long-term collaborative projects.Tomographic reconstruction results in a three dimensional description of an individual EM specimen, most commonly a section, and is therefore applicable to problems in which ultrastructural details within the thickness of the specimen are obscured in single micrographs. Information that can be recovered using tomography includes the 3D shape of particles, and the arrangement and dispostion of overlapping fibrous and membranous structures.

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