Self Folding Of Polymer Sheets Using Local Light Absorption

Self Folding Of Polymer Sheets Using Local Light Absorption. The absorbed light gradually heats the underlying polymer across the thickness of the sheet, which causes relief of strain to induce folding. Science advances 3 (3), e1602417, 2017.

Colored Light Makes This Magical Origami Fold Itself One Step at a Time from gizmodo.com

These color patterns can be designed to absorb only specific wavelengths of light (or to absorb differently at the same wavelength using color hues), thereby providing control of sheet folding with respect to time and space. The temperature of the sheet is highest at the surface where the light impinges on the sheet and decreases through the sheet thickness. Black ink patterned on either side of the polymer sheet provides.

Source: hemi.jhu.edu

Black ink coated on the sheet absorbs the light, which converts the photon energy into thermal energy that heats the sheet locally; The relation between the line pattern design and folding performance was evaluated.

Source: gizmodo.com

The process begins by first stretching poly(methyl methacrylate) (pmma), polystyrene (ps), or polycarbonate (pc) sheets using an extensometer at elevated temperatures close to the glass transition temperature (t g) of each sheet. Most of these approaches are based on synchronous folding, that is, folding of all hinges at the same time (31, 32, 34, 37, 38, 49, 51).

These Color Patterns Can Be Designed To Absorb Only Specific Wavelengths Of Light (Or To Absorb Differently At The Same Wavelength Using Color Hues), Thereby Providing Control Of Sheet Folding With Respect To Time And Space.

The process begins by first stretching poly(methyl methacrylate) (pmma), polystyrene (ps), or polycarbonate (pc) sheets using an extensometer at elevated temperatures close to the glass transition temperature (t g) of each sheet. Line patterns of different transparencies and shapes are used to control the light absorption. Such work will be investigated further in an efri project led by jan genzer of nc state.

Black Ink Coated On The Sheet Absorbs The Light, Which Converts The Photon Energy Into Thermal Energy That Heats The Sheet Locally;

The absorbed light gradually heats the underlying polymer across the thickness of the sheet, which causes relief of strain to induce folding. Science advances 3 (3), e1602417, 2017. Dickey * department of chemical and biomolecular engineering,.

The Ink Absorbs The Light And The Resulting Heat Induces The Polymer Beneath The Ink To Relax

Localizing the strain to a small strip creates a “hinge,” which folds in response to asymmetric heating of the sheet. The line pattern shape is closely related to the folding angle and folding start time. For example, the cubic box features patterned line hinges (10 mm x 10 mm x 10 mm, w = 1.

Most Of These Approaches Are Based On Synchronous Folding, That Is, Folding Of All Hinges At The Same Time (31, 32, 34, 37, 38, 49, 51).

Two outer layers of psps, two layers of paper, and a layer of polyimide (pcb) bearing a copper circuit in the middle. The absorbed light gradually heats the underlying polymer across the thickness of the sheet, which causes relief of strain to induce folding. The temperature of the sheet is highest at the surface where the light impinges on the sheet and decreases through the sheet thickness.

Black Ink Patterned On The Polymer Sheet Provides Localized Absorption Of.

The relation between the line pattern design and folding performance was evaluated. Cutting a gap into the upper paper layer allows controlled folding of the polyimide, and slits in the bottom layers of paper and psps prevent antagonistic forces. Black ink patterned on either side of the polymer sheet provides.