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and shrinkage can result more complex behavior like bending, twisting and folding and they can happen with different magnitudes in different directions. Utilization of these phenomena for the design of structured materials can be highly attractive because they allow simple, template-free fabrication of very complex repetitive 2D and 3D patterns. However, they cannot be prepared by using sophisticated fabrication methods like two-photon and interference photolithography as mentioned before. There is an advantage of the self-folding approach, is the possibility of quick, reversible, and reproducible fabrication of 3D hollow objects with controlled chemical properties and morphology of both the exterior and the interior.
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effect on the material around the voxel/focal point. By moving the focal point around in three-dimensional space and solidifying the medium at different points, the desired 3D geometry can be additively manufactured with feature size down to 100-160 nm as of 2023. The limits of 2PP fabrication depend on the utilized equipment (servo, mirrors, and laser resolution) and selected lens (laser focusing), as well as the material (UV absorption profile and reactivity). Recently, a list of 2PP printed materials has been actively expanding and includes hard and flexible polymers, glass, soft elastomers, enabling microfabrication of various MEMS and soft microbotics.
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for 30 minutes. It is contacted with a photomask using the contact stage. This stage, is leaned against the tilting stage and the resist is exposed to the UV. The dose of 365 nm UV is 500mJ/cm. After the exposure, the resist is post-exposure baked on a 65 °C hot plate for 3 minutes and on a 95 °C plate for 10 minutes. In the end, the resist is developed in the SU-8 for about 10 to 15 minutes at the room temperature with mild agitation and then, rinsed with isopropyl alcohol. Besides that, there can be a lot of other procedures. For example, inclined UV lithography, inclined and rotated UV lithography and lithography using reflected UV.
131:. Microscopic mechanical elements such as micromotors, micropumps, and other microfluidic devices can be produced using direct-write concepts. In addition to additive and subtractive processes, DLW allows for the modification of the properties of a material. Mechanisms that allow for these modifications include sintering, microstereolithography, and multiphoton processes. These use pulsed femtosecond lasers to deliver a precise dosage to induce absorption of energy, leading to an
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fixed onto one location and the translation stage moves to fabricate each layer vector by vector. A faster alternate involves using a projection principle in which the image is projected onto the surface of the resin so that the irradiation of a layer is done in one step only. The high-resolution results allow for the fabrication of complex shapes that would otherwise be difficult to produce at such small scales.
95:
components. Layers in processes such as electrochemical fabrication can be as thin as 5 to 10 μm. The creation of microscopic structures is similar to conventional additive manufacturing techniques in that a computer aided design model is sliced into an appropriate number of two-dimensional layers in order to create a toolpath. This toolpath is then followed by a mechanical system to produce the desired geometry.
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microstructures fabricated by the 3D micro fabrication technology can be allied to a lot of microsystems directly. Also, it can be used as the molds for electroplating. As a result, these technology can be applied to a variety of fields like filters, mixers, jets, micro channels, light guide panels of LCD monitor and more.
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transistor arrays for displays. Another additive process is laser-induced forward transfer (LIFT), which uses pulsed lasers aimed at a coated substrate to transfer material in the direction of the laser flow. LIFT has been used to produce transfer thermo-electric materials, polymers and has been used to print copper wires.
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One factor that limit broad applicability of self-folding polymer films is the manufacturing cost. Actually, polymer can be deposited by spinning and dipping coating at ambient conditions, the fabrication of polymer self-folding films is substantially cheaper than fabrication of inorganic ones, which
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Stimuli-responsive hydrogels mimic swelling/shrinking behavior of plant cells and produce macroscopic actuation in response to a small variation of environmental conditions. Mostly, homogenous expansion or contraction in all directions can result a change of conditions. Also, inhomogeneous expansion
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is a negative thick photoresist, which used in novel 3D micro fabrication method with inclined/rotated UV lithography. During the process, we coat SU-8 50 on a silicon wafer with a thickness of about 100ųm. Then, soft bake the resist on a 65 °C hot plate for 10 minutes and on a 95 °C plate
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Microstereolithography is a common technique based on stereolithography principles. 3D components are fabricated by repeatedly layering photopolymerizable resin and curing under an ultraviolet laser. Earlier systems that employ this technique use a scanning principle in which a focused light beam is
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the resin or glass at a specific point. To achieve high photon currents in the range of 10 photons s cm femtosecond lasers with pulse widths of 100 fs are used. In 2PP, two photons meet at the focal point, doubling the laser's excitation energy and curing a voxel of 2PP resin while having a minimum
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The basic setup of inclined UV exposure has conventional UV source, a contact stage, and a tilting stage. Plus, we place a photomask and a photoresist coated substrate between the upper and lower plates of the contact stage, and it is fixed by pushing up the lower plate with a screw. Then, we can
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Focus on the 3D microstructures now, it have been focused in a lot of microsystems like electronic, mechanical, micro-optical and analysis systems. And when this technology is developing, we found that the traditional and conventional micro machining technologies like surface micromachining, bulk
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Additive processes involve the layering of materials in a certain pattern. These include laser chemical vapor deposition (LCVD), which use organic precursors to write patterns on a structure or bulk material. This application can be found in the field of electronics, particularly in the repair of
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Laser-based techniques are the most common approach for producing microstructures. Typical techniques involve the use of lasers to add or subtract material from a bulk sample. Recent applications of lasers involve the use of ultrashort pulses of lasers focused to a small area in order to create a
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To solve these issues, the future research must be focused on deeper investigation of folding to allow design of complex 3D structures using just 2D shapes. On the other hand, searching a way, which is cheap and fast manufacturing of large quantity of self-folding films can be greatly helpful.
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Design of complicated 3D microstructure can be highly challenging task for development of novel materials for optics, biotechnology and micro/nano electronics. 3D materials can be fabricated using a lot of methods like two-photon photolithography, interference lithography and molding. But 3D
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Much like their macroscopic analog, microstructures can be produced using rapid prototyping methods. These techniques generally involve the layering of some resin, with each layer being much thinner than that used for conventional processes in order to produce higher resolution microscopic
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When the trace of the incident UV with a right angle is on a straight line, so the patterns of a photomask are transcribed to the resist. When talking about inclined UV exposure processes, the UV is refracted and reflected, this makes it possible to fabricate various of 3D structures. The
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Nature offers a large number of ideas for the design of novel materials with superior properties. Self-assembly and self-organization being the main principle of structure formation in nature attract significant interest as promising concepts for the design of intelligent materials.
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refers to manufacturing techniques that involve the layering of materials to produce a three-dimensional structure at a microscopic scale. These structures are usually on the scale of micrometers and are popular in
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102:(SLA), which involves the use of a UV light or laser beam on a surface to create a layer, which are then lowered into a tank so that a new layer can be formed on top. Another commonly used method is
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that can result in annealing and surface structuring of a material. The specific changes caused by irradiation depend on parameters such as pulse energy, pulse duration or pulse repetition rate.
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are produced by vacuum deposition. In another word, there is no method, which is cheap and large-scale production of self-folding polymer films that substantially limits their application.
106:(FDM), in which a moving head creates a layer by melting the model material (usually a polymer) and extrudes the melted material onto a surface. Other methods such as
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Grant-Jacob, James A.; Mills, Benjamin; Feinaeugle, Matthias; Sones, Collin L.; Oosterhuis, Gerrit; Hoppenbrouwers, Marc B.; Eason, Robert W. (2013-06-01).
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One experimental application of self-folding materials is pasta that ships flat but folds into the desired shape on contact with boiling water.
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structuring using these techniques is very complicated, experimentally. This can limit their upscaling and broad applicability.
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pattern that is layered to create a structure. The use of lasers in such a manner is known as direct laser writing (DLW) or
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Srinivasaraghavan
Govindarajan, Rishikesh; Sikulskyi, Stanislav; Ren, Zefu; Stark, Taylor; Kim, Daewon (10 November 2023).
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496:"Micron-scale copper wires printed using femtosecond laser-induced forward transfer with automated donor replenishment"
404:"Characterization of Photocurable IP-PDMS for Soft Micro Systems Fabricated by Two-Photon Polymerization 3D Printing"
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micromachining and GIGA process are not sufficient to fabricate or produce oblique and curved 3D microstructures.
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Three-Dimensional
Microfabrication Using Two-Photon Polymerization: Fundamentals, Technology, and Applications
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Han, M.; Lee, W.; Lee, S.K.; Lee, S.S. (2004). "3D microfabrication with inclined/rotated UV lithography".
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that states a
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Heath, Daniel J; Feinaeugle, Matthias; Grant-Jacob, James A; Mills, Ben; Eason, Robert W (2015-05-01).
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Ionov, L. (2013). "3D microfabrication using stimuli-responsive self-folding polymer films".
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structures with sub-micrometer resolution. The process uses the focal point of a laser to
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Hahn, Vincent; Mayer, Frederik; Thiel, Michael; Wegener, Martin (2019-10-01).
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Fundamentals of Modern
Manufacturing: Materials, Processes, and Systems
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289:(5th ed.). Wiley. p. 846.
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344:Optics and Photonics News
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98:A popular application is
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790:Construction 3D printing
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364:10.1364/OPN.30.10.000028
340:"3-D Laser Nanoprinting"
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153:Multiphoton lithography
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1427:Scratch drive actuator
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42:by rewriting it in an
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480:10.1364/OME.5.001129
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1051:Programmable matter
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904:3D microfabrication
665:Solid ground curing
512:2013OMExp...3..747G
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29:This article
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1558:Wire bonding
1388:Applications
1379:Microchannel
1287:
1174:Robot ethics
1089:Nanorobotics
1056:Quantum dots
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543:(1): 14–20.
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1548:Lithography
1238:Moore's law
1169:Neuroethics
1164:Cyberethics
934:Utility fog
919:Claytronics
909:3D printing
686:Robocasting
465:(5): 1129.
387:25 November
186:Fabrication
1628:Categories
1543:Deposition
1501:Micropower
1422:Comb drive
1374:Cantilever
1129:Automation
1014:Metal foam
382:Nanoscribe
350:(10): 28.
240:References
52:March 2020
1609:Smart cut
1514:Processes
1414:Actuators
1159:Bioethics
977:Fullerene
317:. Wiley.
1594:Lift-off
1572:Specific
1442:Switches
1084:Domotics
1076:Robotics
1061:Silicene
982:Graphene
440:38006101
431:10675433
408:Polymers
157:3D print
1553:Etching
1521:General
1396:Sensors
952:Aerogel
508:Bibcode
467:Bibcode
352:Bibcode
227:Outlook
38:Please
1154:Ethics
1122:Topics
890:Fields
438:
428:
321:
293:
268:
1579:LOCOS
1464:Other
1589:LIGA
1289:List
436:PMID
389:2023
319:ISBN
291:ISBN
266:ISBN
196:SU-8
82:and
590:doi
545:doi
541:111
516:doi
475:doi
426:PMC
416:doi
360:doi
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305:^
248:^
86:.
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