共查询到20条相似文献，搜索用时 0 毫秒
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Sajad Razavi Bazaz Navid Kashaninejad Shohreh Azadi Kamal Patel Mohsen Asadnia Dayong Jin Majid Ebrahimi Warkiani 《Advanced Materials Technologies》2019,4(10)
Polydimethylsiloxane (PDMS) is a long‐standing material of significant interest in microfluidics due to its unique features. As such, rapid prototyping of PDMS‐based microchannels is of great interest. The most prevalent and conventional method for fabrication of PDMS‐based microchips relies on softlithography, the main drawback of which is the preparation of a master mold, which is costly and time‐consuming. To prevent the attachment of PDMS to the master mold, silanization is necessary, which can be detrimental for cellular studies. Additionally, using coating the mold with a cell‐compatible surfactant adds extra preprocessing time. Recent advances in 3D printing have shown great promise in expediting microfabrication. Nevertheless, current 3D printing techniques are sub‐optimal for PDMS softlithography. The feasibility of producing master molds suitable for rapid softlithography is demonstrated using a newly developed 3D‐printing resin. Moreover, the utility of this technique is showcased for a number of widely used applications, such as concentration gradient generation, particle separation, cell culture (to show biocompatibility of the process), and fluid mixing. This can open new opportunities for biologists and scientists with minimum knowledge of microfabrication to build functional microfluidic devices for their basic and applied research. 相似文献
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Luca Hirt Alain Reiser Ralph Spolenak Tomaso Zambelli 《Advanced materials (Deerfield Beach, Fla.)》2017,29(17)
Currently, the focus of additive manufacturing (AM) is shifting from simple prototyping to actual production. One driving factor of this process is the ability of AM to build geometries that are not accessible by subtractive fabrication techniques. While these techniques often call for a geometry that is easiest to manufacture, AM enables the geometry required for best performance to be built by freeing the design process from restrictions imposed by traditional machining. At the micrometer scale, the design limitations of standard fabrication techniques are even more severe. Microscale AM thus holds great potential, as confirmed by the rapid success of commercial micro‐stereolithography tools as an enabling technology for a broad range of scientific applications. For metals, however, there is still no established AM solution at small scales. To tackle the limited resolution of standard metal AM methods (a few tens of micrometers at best), various new techniques aimed at the micrometer scale and below are presently under development. Here, we review these recent efforts. Specifically, we feature the techniques of direct ink writing, electrohydrodynamic printing, laser‐assisted electrophoretic deposition, laser‐induced forward transfer, local electroplating methods, laser‐induced photoreduction and focused electron or ion beam induced deposition. Although these methods have proven to facilitate the AM of metals with feature sizes in the range of 0.1–10 µm, they are still in a prototype stage and their potential is not fully explored yet. For instance, comprehensive studies of material availability and material properties are often lacking, yet compulsory for actual applications. We address these items while critically discussing and comparing the potential of current microscale metal AM techniques. 相似文献
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Akhilesh K. Gaharwar Ayyoob Arpanaei Thomas L. Andresen Alireza Dolatshahi‐Pirouz 《Advanced materials (Deerfield Beach, Fla.)》2016,28(4):771-781
Three dimensional (3D) biomaterial microarrays hold enormous promise for regenerative medicine because of their ability to accelerate the design and fabrication of biomimetic materials. Such tissue‐like biomaterials can provide an appropriate microenvironment for stimulating and controlling stem cell differentiation into tissue‐specific lineages. The use of 3D biomaterial microarrays can, if optimized correctly, result in a more than 1000‐fold reduction in biomaterials and cells consumption when engineering optimal materials combinations, which makes these miniaturized systems very attractive for tissue engineering and drug screening applications. 相似文献
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Feng Zhang Man Jia Jiahang Wang Mengjia Xu Chenxu Wei Weidong Li Zongan Li 《Advanced Engineering Materials》2024,26(12):2301984
Porous ceramics hold the great potential in the field such as bone tissue engineering, superinsulation material, and energy storage. However, it is quite challenging to fabricate them with arbitrary shape using conventional processes. Herein, a method to fabricate arbitrary-shaped porous ceramic structure is presented by combining traditional freeze-casting process and indirect three-dimensional printing technology. Various polydimethylsiloxane (PDMS) soft molds are prepared for freeze-casting, and diverse-shaped porous ceramics are fabricated. It proves that PDMS molds are ideal choices for freeze-casting of porous ceramics with complex geometries. The freeze-casting process of a complex-shaped model with PDMS is simulated by finite element analysis. The effect of the solid loading of the alumina suspension on the microstructure and compressive strength of the as-fabricated porous ceramics are investigated. The present study provides a strategy to fabricate complex-shaped porous ceramic structure that can be used in a wide variety of applications. 相似文献
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Jemish Parmar Xing Ma Jaideep Katuri Juliane Simmchen Morgan M Stanton Carolina Trichet-Paredes Lluís Soler Samuel Sanchez 《Science and Technology of Advanced Materials》2015,16(1)
Self-propelled micromotors are emerging as important tools that help us understand the fundamentals of motion at the microscale and the nanoscale. Development of the motors for various biomedical and environmental applications is being pursued. Multiple fabrication methods can be used to construct the geometries of different sizes of motors. Here, we present an overview of appropriate methods of fabrication according to both size and shape requirements and the concept of guiding the catalytic motors within the confines of wall. Micromotors have also been incorporated with biological systems for a new type of fabrication method for bioinspired hybrid motors using three-dimensional (3D) printing technology. The 3D printed hybrid and bioinspired motors can be propelled by using ultrasound or live cells, offering a more biocompatible approach when compared to traditional catalytic motors. 相似文献
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AbstractSelf-propelled micromotors are emerging as important tools that help us understand the fundamentals of motion at the microscale and the nanoscale. Development of the motors for various biomedical and environmental applications is being pursued. Multiple fabrication methods can be used to construct the geometries of different sizes of motors. Here, we present an overview of appropriate methods of fabrication according to both size and shape requirements and the concept of guiding the catalytic motors within the confines of wall. Micromotors have also been incorporated with biological systems for a new type of fabrication method for bioinspired hybrid motors using three-dimensional (3D) printing technology. The 3D printed hybrid and bioinspired motors can be propelled by using ultrasound or live cells, offering a more biocompatible approach when compared to traditional catalytic motors. 相似文献
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Daniel Widerker;Govind V. Kaigala;Moran Bercovici; 《Advanced Materials Technologies》2024,9(4):2301290
This study presents a device and method for multi-metal printing of microscale structures. The method is based on combining hydrodynamic confinement of electrolytes with localized electrochemical deposition (HLECD), allowing rapid switching of the deposited metal. The device used in HLECD integrates a micro-anode on a vertical microfluidic chip containing two open-ended channels that control the flow of electrolytes surrounding the anode. When placed on top of a conducting surface, a localized electrochemical reaction is initiated, wherein the deposited metal composition is dictated by the electrolyte in the confinement. A range of electrolytes, which are used to deposit copper, tin, silver, and nickel, are used to fabricate multiple structures involving more than 60 material changes within a single printing process. The structures are analyzed using electron microscopy, showing the ability to achieve sharp transitions between pure metals. The constant replenishment of electrolytes also eliminates the problem of ion depletion commonly occurring in localized electrochemical deposition, and enables printing rates that are nearly an order of magnitude greater. 相似文献
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Muhammad Ahsan Tauseef Rana Asgari Sabet Onur Tokel 《Advanced Materials Technologies》2024,9(9):2301617
The trend toward ever-increased speeds for microelectronics is challenged by the emergence of heat-wall, leading to the faltering of Moore's Law. A potential solution may be integrating microfluidic channels into silicon (Si), to deliver controlled amounts of cooling fluid and regulate hot spots. Such meandering microfluidic channels within other transparent materials already played significant roles, including in biomedical and sensor applications; however, analogous channel architectures do not exist in Si. Here, a novel method is proposed to fabricate buried microchannel arrays monolithically integrated into Si, without altering the wafer surface. A two-step, laser-assisted subtractive removal method is exploited, enabling fully-buried multi-level architectures, with control on the channel port geometry, depth, curvature, and aspect ratio. The selective removal rate is 750 µm per h per channel, and the channel inner-wall roughness is 230 nm. The method preserves top wafer surface roughness of 2 nm, with significant potential for 3D integrated systems. 相似文献
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Hao Wang Yan Bao Zhengyi Mao Jie Pan Haidong Bian Zhengtao Xu Jian Lu Yang Yang Li 《Advanced Engineering Materials》2021,23(12):2100866
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3D 打印技术在包装容器成型中的应用 总被引：9，自引：5，他引：4
以包装容器设计为出发点,运用分析、比较、例证的研究方法,通过对3D打印技术的应用分析,探讨3D打印技术可在包装容器的成型过程中应用的领域,以期为包装容器的成型过程开发提供新的思路。 相似文献
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Pieter F. Moonen Iryna Yakimets Jurriaan Huskens 《Advanced materials (Deerfield Beach, Fla.)》2012,24(41):5526-5541
In this report, the development of conventional, mass‐printing strategies into high‐resolution, alternative patterning techniques is reviewed with the focus on large‐area patterning of flexible thin‐film transistors (TFTs) for display applications. In the first part, conventional and digital printing techniques are introduced and categorized as far as their development is relevant for this application area. The limitations of conventional printing guides the reader to the second part of the progress report: alternative‐lithographic patterning on low‐cost flexible foils for the fabrication of flexible TFTs. Soft and nanoimprint lithography‐based patterning techniques and their limitations are surveyed with respect to patterning on low‐cost flexible foils. These show a shift from fabricating simple microlense structures to more complicated, high‐resolution electronic devices. The development of alternative, low‐temperature processable materials and the introduction of high‐resolution patterning strategies will lead to the low‐cost, self‐aligned fabrication of flexible displays and solar cells from cheaper but better performing organic materials. 相似文献
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Ideally, many materials should have a “knob” that allows for changing its properties at will, including the possibility to flip the sign of its behavior. This “knob” could be used to continuously tune the properties or in the sense of a digital switch. Such extreme level of stimulus–responsiveness has come into reach with recently increased possibilities of manufacturing complex rationally designed artificial materials called metamaterials on the micrometer scale. Here, we present mechanical metamaterials composed of liquid–crystal elastomers, whose director field is arranged into a designed complex three-dimensional (3D) pattern during the 3D laser printing process. External light from a blue LED, with intensities in the range of 10–30 W/cm2, serves as the stimulus. In the first example, we repeatedly flip the sign of the Poisson’s ratio of an achiral architecture within classical elasticity. In the second example, we flip the sign of the twist per strain in a chiral metamaterial beyond classical elasticity. The presented examples overcome major limitations in responsive mechanical metamaterials and we foresee many possible three-dimensional responsive micro-architectures manufactured along these lines. 相似文献
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Hany Hassanin Ghazal Sheikholeslami Pooya Sareh Rihana B. Ishaq 《Advanced Engineering Materials》2021,23(12):2100422
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Markos Athanasiadis Anna Pak Dzmitry Afanasenkau Ivan R. Minev 《Advanced Materials Technologies》2019,4(7)
Direct Ink Writing is an additive fabrication technology that allows the integration of a diverse range of functional materials into soft and bioinspired devices such as robots and human‐machine interfaces. Typically, a viscoelastic ink is extruded from a nozzle as a continuous filament of circular cross section. Here it is shown that a careful selection of printing parameters such as nozzle height and speed can produce filaments with a range of cross‐sectional geometries. Thus, elliptic cylinder‐, ribbon‐, or groove‐shaped filaments can be printed. By using the nozzle as a stylus for postprint filament modification, even filaments with an embedded microfluidic channel can be produced. This strategy is applied to directly write freeform and elastic optical fibers, electrical interconnects, and microfluidics. The integration of these components into simple sensor‐actuator systems is demonstrated. Prototypes of an optical fiber with steerable tip and a thermal actuation system for soft tissues are presented. 相似文献