Thermally-induced miniaturization for micro- and nanofabrication: progress and updates

Lin, Sophia; Lee, Eugene K.; Nguyen, Nancy; Khine, Michelle

doi:10.1039/c4lc00528g

Cited by 59 publications

(45 citation statements)

References 113 publications

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“…We have previously demonstrated that self‐similar hierarchal wrinkled structures in metal thin films can be created via heat induced biaxial shrinking on shape memory polymers (SMPs), such as polystyrene(PS) . The buckling occurs due to the mismatches in stiffness between the SMP and the deposited material during the shrinking process . Spray gun deposition was used to deposit CNT thin films on SMP.…”

mentioning

confidence: 99%

Highly Flexible Wrinkled Carbon Nanotube Thin Film Strain Sensor to Monitor Human Movement

Park

Kim

Chu

et al. 2016

Adv Materials Technologies

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mentioning

confidence: 99%

Highly Flexible Wrinkled Carbon Nanotube Thin Film Strain Sensor to Monitor Human Movement

Park

Kim

Chu

et al. 2016

Adv Materials Technologies

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164

137

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“…Stress relaxation can also occur through thermal actuation of pre‐stressed “shape memory” polymer substrates . The thermally activated substrates consist of pre‐stretched thermoplastics (e.g., polystyrene, polyolefin), often known as “shrink film”.…”

Section: Wrinkling and Crumpling Of 2d Materials Films On Flat Substratesmentioning

confidence: 99%

From Flatland to Spaceland: Higher Dimensional Patterning with Two‐Dimensional Materials

et al. 2017

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The creation of three-dimensional (3D) structures from two-dimensional (2D) nanomaterial building blocks enables novel chemical, mechanical or physical functionalities that cannot be realized with planar thin films or in bulk materials. In this Progress Report, we review the use of emerging 2D materials to create complex out-of-plane surface topographies and 3D material architectures. We focus on recent approaches that yield periodic textures or patterns, and present four techniques as case studies: (i) wrinkling and crumpling of planar sheets, (ii) encapsulation by crumpled nanosheet shells, (iii) origami folding and kirigami cutting to create programmed curvature, and (iv) 3D printing of 2D material suspensions. Work to date in this field has primarily used graphene and graphene oxide as the 2D building blocks, and we consider how these unconventional approaches may be extended to alternative 2D materials and their heterostructures. Taken together, these emerging patterning and texturing techniques represent an intriguing alternative to conventional materials synthesis and processing methods, and are expected to contribute to the development of new composites, stretchable electronics, energy storage devices, chemical barriers, and biomaterials.

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“…In particular, thermoplastic SMPs are attractive due to their low cost and processability. Heating an unaltered amorphous polymer sheet above its T g , stretching the material, and cooling the sheet below T g stores strain in the polymer . Industrially, strained polymer sheets are made through numerous methods including blown film extrusion, roll‐to‐roll processing, or film casting .…”

Section: Introductionmentioning

confidence: 99%

Shape memory polymers for self‐folding via compression of thermoplastic sheets

Hubbard

Davis

Dickey

et al. 2018

J of Applied Polymer Sci

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We report a simple method to strain, and thereby program, shape memory polymers by compressing planar thermoplastic sheets. This work is motivated by the limited number of commercially available prestrained polymer sheets; current examples include: Shrinky Dinks, Eastman's Embrace, and polyurethane shrink films. However, these commercial specimens limit the sample thickness, polymer composition, and amount of stored strain. We show here that melt pressing can strain thermoplastic sheets over a range of thicknesses and polymer chemical compositions. After pressing (and thus, straining), the polymer sheets can self-fold out-of-plane into complex geometries using two different actuation mechanisms, both of which locally release strain stored in the polymer. Threedimensional geometries are attained experimentally with both thick (~12 mm) and thin (~1 mm) strained polymer samples with a range of polymer compositions. Digital image correlation maps the strain profile within the melt pressed samples while a Mooney-Rivlin and geometric model predicts the average strain and folding response of the samples, respectively. The model predictions agree well with experimental results. These findings enable self-folding with a broader design space such as polymer chemical composition, sample thickness, strain within the sample, and external stimulus. Techniques presented here should translate to other thermoplastic polymers, thus making this technique a viable tool to increase the available pool of materials available for self-folding devices.

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Thermally-induced miniaturization for micro- and nanofabrication: progress and updates

Cited by 59 publications

References 113 publications

Highly Flexible Wrinkled Carbon Nanotube Thin Film Strain Sensor to Monitor Human Movement

Highly Flexible Wrinkled Carbon Nanotube Thin Film Strain Sensor to Monitor Human Movement

From Flatland to Spaceland: Higher Dimensional Patterning with Two‐Dimensional Materials

Shape memory polymers for self‐folding via compression of thermoplastic sheets

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