This work was supported by the NSF (CMMI-1351370).

1，设计面膜供体基板的制作<ol><li>设计具有所需几何形状的面具。为了制作100微米×100微米见方的硅个别单位，画出100微米×100微米的正方形阵列。 </li><li>设计第二掩模具有相同的几何形状，与各侧延伸出额外的15微米。为100微米×100微米的正方形阵列，绘制的130微米×130微米的正方形可以覆盖的平方在步骤1.1的阵列。 </li><li>设计锚几何。得出4个20微米×40微米的矩形，每个沿着正方形的一边为中心。放置的结构，使得第一15μm的覆盖原来的100微米×100微米的正方形，在步骤1.1和向外剩余的25微米的延伸（ 如图2）。 注意:任何形状和尺寸可以作为长期被用作锚接点的图案化的材料和基片。这种锚的一端覆盖的起源在步骤1.1，将另一端几何人应该延伸出的几何形状，在步骤1.2。 </li></ol> 2，准备打捞供体基板<ol><li>准备上绝缘体（SOI）晶片的p型掺杂的硅用3微米的器件层的厚度，具有1-20Ω•厘米和框氧化物层的1微米厚的薄层电阻。注:对于不同的应用中，这些参数都可以修改。 </li><li>旋涂光致抗蚀剂（AZ5214，3000 rpm离心30秒，1.5微米厚），并附加设计步骤1.1掩模。 </li><li>使用反应离子刻蚀（RIE）的仪器，图案的SOI晶片的器件层和除去光致抗蚀剂掩模。在此步骤之后，在RIE腐蚀区域暴露的框中氧化物层（ 图2A）。 </li><li>旋涂光致抗蚀剂（AZ5214，3000 rpm离心30秒，1.5μm厚）和图案掩模设计步骤1.2。 </li><li>加热晶片，在125℃下进行90秒的热板上。 </li><li>沉浸在晶圆成49％的HF，50秒蚀刻步骤2.3暴露箱的氧化层。经过彻底的干燥，去除光致抗蚀剂掩模（ 图2B）。 </li><li>旋涂（AZ5214，3000 rpm离心30秒，1.5μm厚）和图案从步骤1.3锚固设计。 </li><li>加热晶片，在125℃下进行90秒的热板上。 </li><li>浸入49％的HF 50分钟。这一步刻蚀余下的剩余图案的器件层的硅下面的框中的氧化层，从而导致光致抗蚀剂（ 图2C）悬浮硅个别单元。 </li></ol> 3，设计面膜微尖邮票<ol><li>设计一个面具一个100微米×100微米的正方形。 </li><li>设计一个面具多12微米×12微米，100微米×100微米区域内的广场。 </li></ol> 4，使模具的微尖邮票<ol><li>清洁硅晶片上的&lt;1-0-0&gt;晶向，DEPO利用等离子体增强化学气相沉积（PECVD）设备坐氮化硅为100nm。 </li><li>旋涂光致抗蚀剂（AZ5214，3000 rpm离心30秒，1.5μm厚）和图案掩模设计步骤3.2。 </li><li>图案用10:1缓冲氧化蚀刻剂（BOE）的氮化硅层。 </li><li> 170毫升去离子水和40ml异丙醇（IPA）混合物的烧杯中的溶解将80克氢氧化钾（KOH）。 </li><li>在80℃下加热的KOH，IPA和水的混合物在热板上。 </li><li>垂直放置准备好的晶片在烧杯中，用KOH的混合物以蚀刻露出的硅中的晶体结构（蚀刻率大约是1微米/分钟）。 </li><li>后暴露的硅被完全蚀刻时，从氢氧化钾混合物取出晶片，使用HF刻蚀掉氮化硅，并执行RCA 1和RCA清洗2（ 图3A）。 </li><li>旋涂以SU-8 100和模式与步骤3.1准备的面具下面的配方:3,000Ř时，持续1分钟，软烘烤，在65℃10分钟，95℃30分钟，暴露与550毫焦耳/厘米2，和后烘烤在65℃下1分钟，95℃，10分钟（ 图3B中 ）。 </li><li>后的SU-8 100完全固化，适用的（十三氟-1，1,2,3 - 四氢辛基）-1 - 三氯硅烷的单层滴加3-5滴（十三氟-1，1,2,3 - 四氢辛基）-1-三氯成真空罐，并放置在晶圆的jar和应用真空。 </li></ol> 5，重复微尖邮票使用模具<ol><li>混合聚二甲基硅氧烷（PDMS）基料和固化剂以5:1的比例。 </li><li>通过将其放置在真空罐脱气混合物。 </li><li>在模具上倒脱气PDMS混合物的一小部分，并让PDMS回流，实现了平坦的顶面（ 图3C）。 </li><li>将模具在烘箱中的PDMS在70℃下搅拌2小时以完全固化的PDMS。 </li><li>从取出模具烘箱和剥离PDMS关闭（ 图3D）。 </li></ol> 6，从供体基板检索墨水和打印目标区域上<ol><li>将供体基板上电动旋转和X，配备了显微镜y平移阶段。 </li><li>装上微尖戳一个独立的垂直平移阶段。 </li><li>在显微镜下，配合使用的平移和旋转阶段在施主衬底上的硅墨的微尖的邮票。此外，做了微尖的表面与Si墨水通过调整倾斜阶段之间的倾斜取向。随后，把微尖戳下来进行接触。 </li><li>初次接触后，慢慢把微尖戳进一步下降，从而使小技巧完全倒塌，整个表面是在与供体基底的硅墨水接触。 </li><li>迅速提高z载物台，打破了锚由于微尖戳和Si墨水之间的接触面积较大，对r从供体基板etrieve硅墨水，并将其附加到微尖戳。 注意:当微尖的邮票是没有任何压力，压缩的微尖恢复到原来的金字塔形状，使得与检索到的硅墨水最小的接触。 </li><li>放置在接收基板上一个x，y平移阶段和对齐检索的硅墨下在所需位置的微尖的邮票。 </li><li>下降的Z阶段，直到检索到硅墨勉强使得与接收器基板接触。 </li><li>使接触后，慢慢地提高该Z载台，以释放硅墨水，在所希望的位置打印。 </li></ol> 7，粘接工艺<ol><li>程序的快速热退火炉中循环从室温上升至950℃，在90秒，保持在950℃下进行10分钟，并冷却至室温（通过除去在炉中的任何供热）。 </li><li>将打印接收基板在炉中的环境空气环境和退火，在​​950℃C为10分钟为的Si-Si键合，或在360℃下30分钟，对硅 - 金键合。 </li></ol>

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The authors have nothing to disclose.

微砖石，在图4中提出的，涉及硅熔融键合在一材料粘接工序。硅熔融键合是通过将样品中的快速热退火炉（RTA炉）和样品加热至950℃保持10分钟来实现。这种退火条件是双方可采用习之-硅和硅- 二氧化硅结合10,11。可替代地，结合有硅条如在图5C中发现的凹采用共晶键合，因此，该粘合温度是大约在Si-Au共晶体的温度（363℃）30分钟8。以确保共晶键合之前，印刷油墨区上的硅带，该带材的Si需要进​​行彻底的与49％的HF清洗，以防止任何杂质，例如原生氧化层的Au与Si的界面。能够组装金薄膜微砖石巨大改善了微砖石生产计划正弦的适应面广Ë它引入了材料的金属类型。由于与硅的低接触电阻，也可以作为在厼等人提出可以用作在完成的MEMS器件的电极，以及一个悬膜弯曲。9 开发了可转移的油墨量目前仅限于Si和Au和它们的相应的接收器基片的材料是Si和SiO 2为硅，以及Au和Si为金。总体而言，在印刷工序中的接收基板和油墨的结果易于之间更大的接触面积。然而，印刷油墨，同时在表面部分地接触也是可行的，导致悬挂结构，如在图4E。 虽然微砌体是一种新型的微细加工的方法，仍然存在着局限性在这个过程中需要克服。由于固体油墨的电流确定性组装第一，远远最多的是制造可扩展性进行个别LY，而不是在同一时间。另外，由于硅熔融键合在高温行使，在硅和二氧化硅的差异2的热膨胀系数可能导致屈曲/剥离的界面。这些限制需要进一步调查为微砌筑技术的更广泛的适应性。 如示于图4中 ，微砌筑有对常规的MEMS工艺，它主要依靠单块微加工，通过其独特的添加剂和三维微观结构，是以前看不见的柔性制造能力的巨大影响。此外，微砌体有，因为它使用柔软的弹性体邮票不破坏表面处理中的微尺度眉清目秀的能力。未来的工作包括平行转移印花，以减少装配时间，通过激光辅助退火和延伸这个过程潜水员启用本地化的键合工艺本身MEMS材料如SiO 2，硅×N的Y，铝等 。

微机电系统（MEMS），如大型普通三维机器的小型化，是必不可少的通过提供增强性能和降低制造成本的1,2推进现代技术。但是，不能维持在MEMS技术进步的现行税率不连续创新的制造技术3-6。常见的单片微加工主要依赖层 - 层过程的集成电路（IC）的制造开发。这种方法已经在使批量生产高性能的MEMS器件相当成功的。但是，由于其复杂的层 - 层和电化学性质减色，制造多样形状的3D MEMS结构和设备，同时便于在宏观世界，是非常具有挑战性的，以实现使用这种单片微加工。为了让更多的灵活的三维微细加工用量少过程的复杂性，我们德韦大步三维添加剂micromanufacturing策略（称为"微/纳米砖石&#39;），它涉及的微/纳米材料的转移印花为基础的组装与快速热退火功能材料粘接技术相结合。 转印是一种方法，从那里它们被使用的弹性体邮票控制干附着力产生或生长到不同衬底上的衬底转移固体微尺度材料（ 即，"固体墨"）。微砌体的典型过程开始转移印花。预制的固体油墨转印用微针戳即弹性邮票的一种高级形式，并在印刷结构被采用快速热退火（RTA），以提高油墨的油墨和油墨 - 基底粘附随后退火打印。该制造方法能够使异常微尺度结构和设备不能使用其他现有METHO收容的结构DS 7。 微砖石提供了不存在在其他方法中的一些吸引人的特点:（一）整合异种材料的功能和结构的固体油墨组装MEMS传感器的能力和执行器的三维结构中都集成; （二）组装的固体油墨的接口都可以充当电及热接触9,10; （三）装配空间分辨率可高（〜1微米）通过利用高度可扩展和易于理解的平版印刷工艺产生的固体油墨和高精密的 ​​机械阶段的转移印花7;及（d）的功能和结构的固体油墨可集成在刚性和柔性基板中的平面或曲线的几何形状。

<table border="0" cellpadding="0" cellspacing="0" width="758">
	<tbody>
		<tr height="20">
			<td height="20" style="height:20px;width:217px;">Name of Material / Equipment</td>
			<td style="width:97px;">Company</td>
			<td style="width:97px;"></td>
			<td style="width:347px;">Comments / Description</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Az 5214</td>
			<td>Clariant</td>
			<td></td>
			<td>1.5 mm thick photoresist</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Su8-100</td>
			<td>Microchem</td>
			<td></td>
			<td>100 mm Photoresist used in mold</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Sylgard 184</td>
			<td>Dow Corning</td>
			<td></td>
			<td>PDMS mixed to fabricate stamp</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Hydrofluoric Acid</td>
			<td>Honeywell</td>
			<td></td>
			<td>Acid to etch silicon oxide layer</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Silicon on insulator</td>
			<td>Ultrasil</td>
			<td></td>
			<td>Donor substrate was fabricated</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">trichlorosilane</td>
			<td>Sigma-Aldrich</td>
			<td></td>
			<td>Chemical used to help pealing of PDMS from mold</td>
		</tr>
	</tbody>
</table>

micro-masonry for 3d additive micromanufacturing

转印是一种方法来从在那里它们被通过利用弹性体邮票产生一个不同的衬底上的衬底转移固体微/纳米级材料（在本文中被称为"油墨"）。转移印花使异质材料的集成制造被发现在最近的先进设备，如灵活和可拉伸的太阳能电池和LED阵列，无可比拟的结构或功能系统。而转移印花表现出料组件能力的独特功能，利用粘接剂层或表面改性，例如自组装单层（SAM）在基板上用于增强印刷工艺沉积阻碍了其广泛适应于微组装微机电系统（MEMS）结构和设备。为了克服这一缺点，我们开发了转移印花的先进模式，确定性仅仅通过控制表面的接触面积组装个人微尺度物体没有任何表面变化。由于没有粘接剂层或其它修饰和随后的材料键合过程中确保不仅机械结合，但组装材料之间还热和电的连接，从而进一步打开以适应不同的应用在构建寻常的MEMS器件。

微砌体使异质材料结合产生的MEMS结构，是非常具有挑战性的或不可能实现的单片微加工工艺。为了说明其功能，结构（称为"微茶壶&#39;）被制成仅通过微砌筑。 图4A是在一个施主衬底制造硅油墨的光学显微镜图像。所设计的墨是光盘与由单结晶硅的尺寸不同，它们是微茶壶的积木。一旦施主衬底被独立地准备，光盘是转移印刷到一个接收基板和层采用微尖戳， 如图4B退火层。微茶壶的内侧区域是中空如可以从各装配圆盘可以看出。此外，微砌筑工艺的精巧被转移印花和退火相当精致辐透也测试ONIC水晶血小板（ 图4C-E）。光子表面被第一图案化纳米压印光刻技术和在协议中所概述制成的施主衬底可转移油墨。一旦油墨被充分的准备，该光子晶体的血小板被转印到4的Si环厚度为50微米，形成像图4E中所示的配置的表。 除了 ​​在微砌筑硅油墨， 如图影像微砌筑5显示的例子采用组装薄金膜。 图5A是准备为400nm厚的Au膜的施主衬底的光学显微镜图像。这些油墨被进一步处理和测试，以传送印刷到金表面（ 图5B），以及在Si的表面（ 图5C）。 与此微砌体为Au薄膜组件至关重要的是，在没有任何粘合剂层，叔他转移印刷的金薄膜表现出与所述接收基板电导。虽然这是很难实现转移印花金片和一个接收器金表面之间有很强的机械粘合，部件被关押在地方通过范德华力，没有任何进一步的处理（ 图5B）9具有强大的电导率。 相反，金薄膜与硅表面的异质整合通过转印印刷，并在约的Si-Au共晶体的温度快速热退火也实现。通过在退火过程中，在Si-凹界面接触电阻显著减少类似于溅射沉积的样品由于硅 - 金共晶结合。由传输线测量（TLM）的实验中，这种说法已经被证实（ 图5C）10。 <img alt="图1" fo:conteNT-宽度="5英寸"SRC ="/ files/ftp_upload/51974/51974fig1highres.jpg"宽度="500"/&gt; 图1。一般过程微砖石7流 。作为制备工序中，施主衬底，邮票和接收基板独立地制备的:（A）一旦所有的不同元件的布置，第一微尖戳附加到放在一个透明的玻璃载片倒置，使得所述微尖在邮票指向下方。之后印模平稳地放置，施主衬底位于在x，y轴台和邮票与通过显微镜在施主衬底上的油墨对齐（B）接着，将印模放倒在施主衬底和施加预压在印章上，使得在邮票所有微尖完全折叠。（C）然后，邮票迅速提高和墨被检索并连接到一个邮票（D）为了打印retriev版油墨，与油墨印记的谨慎对齐到目标区域，在这种降低的墨水使与接收基片接触 ​​，同时轻轻的尖端被部分折叠。（E）虽然墨是在与所述接收基板接触时，该邮票是慢慢提高。由于在比在印章墨水界面墨体界面较大范德华相互作用，油墨保留在接收器基片上（F）与组装的油墨接收衬底被移动到快速热退火炉中进行退火，在950℃ C为10分钟为的Si-Si键合，或在360℃下进行硅 - 金键合30分钟。退火工序后的转印步骤就完成了微砌筑过程。转载自厼等权限。7 <a href="https://www-jove-com.remotexs.ntu.edu.sg/files/ftp_upload/51974/51974fig1highres.jpg" target="_blank">请点击此处查看该图的放大版本。</a> 图2。示意图供体基板的准备工作。（一）在SOI晶片，设备层构图成所需的尺寸和几何形状。（B）以下的HF湿法刻蚀工艺去除暴露的SiO 2箱层，除了下方的区域图案化的Si（C）的光致抗蚀剂旋涂并构图，以形成锚定（D）随后，将基片浸入到HF蚀刻掉剩余的SiO 2。经过足够的时间在短波，中硅方油墨阵列暂停，自由站立与施主衬底上只有光刻胶锚。 <a href="https://www-jove-com.remotexs.ntu.edu.sg/files/ftp_upload/51974/51974fig2highres.jpg" target="_blank">请点击此处查看该图的放大版本。</a> 图3示意图邮票制造 7 的（A）为了使一模具的微尖的邮票，在Si晶片清洗和小金字塔形的微凹坑是通过KOH蚀刻在晶片上创建的（B）在蚀刻完成后，在晶片的表面通过RCA 2清洗过程随后通过施加和图案化的SU8以形成腔体在微尖清洗。随后，三氯硅烷的单层涂覆在模具滴加3-5滴三氯硅烷的成真空罐和将晶片和抽真空的真空罐，以促进下面的PDMS模/脱模过程（C）一旦涂层被做的PDMS前体倾并固化在烘箱中（D）的固化的PDMS被简单地剥离从模具中完成模具的制备过程中产生的微尖戳。转载自厼等权限。7 <a href="https://www-jove-com.remotexs.ntu.edu.sg/files/ftp_upload/51974/51974fig3highres.jpg" target="_blank">请点击此处查看该图的放大版本。</a> <img alt="图4" fo:content-width="5in" src="/files/ftp_upload/51974/51974fig4highres.jpg" width="500" /> 在思微砖石 7 图4。代表作品。（一）在供体基板环状硅墨水光学显微镜图像，（B）通过微砖石构成的微茶壶结构，扫描电子显微镜（SEM）图像（ C）图中的硅光子表面的四个硅环，微砌体（在光子面（D）和四个装配硅光子表面纳米结构的D，E）的SEM照片<html>硅环（E）。转载自厼等权限。7 <a href="https://www-jove-com.remotexs.ntu.edu.sg/files/ftp_upload/51974/51974fig4highres.jpg" target="_blank">请点击此处查看该图的放大版本。</a> <img alt="图5" fo:content-width="5in" src="/files/ftp_upload/51974/51974fig5highres.jpg" width="500" /> 中金微砖石 8 图5。代表作品 。与检索排在前列，并准备进行检索底行金油墨，（B）印刷Au膜转移的SEM图像准备好的供体基板（A）光学显微镜视图在图案的金表面，转移印花金片上的图案化硅条（C）SEM图像。转载自厼等权限。8获得="_blank"&gt;请点击这里查看这个数字的放大版本。

Watch this Scientific Journal Video about Micro-masonry for 3D Additive Micromanufacturing at JoVE.com

Micro-masonry for 3D Additive Micromanufacturing

本文介绍了一种3D添加剂micromanufacturing策略（称为"微砌体&#39;）的微机电系统（MEMS）的结构和设备的柔性制造。这种方法涉及与快速热退火功能材料粘接技术相结合转移印花为主的微/纳米材料组装。

微砌筑的3D添加剂Micromanufacturing

Transfer printing is a method to transfer solid micro/nanoscale materials (herein called &#8216;inks&#8217;) from a substrate where they are generated to ...

micro-masonry-for-3d-additive-micromanufacturing

Nanyang Technological University

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Civil Engineering

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Unit 1

Masonry

SCIENTISTS IN ACTION

10.3K 次观看.  University of Illinois at Urbana-Champaign. 本文介绍了一种3D添加剂micromanufacturing策略（称为"微砌体'）的微机电系统（MEMS）的结构和设备的柔性制造。这种方法涉及与快速热退火功能材料粘接技术相结合转移印花为主的微/纳米材料组装。 

视频: Micro-masonry for 3D Additive Micromanufacturing

High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques

Digital fringe projection (DFP) techniques provide dense 3D measurements of dynamically changing surfaces.&#160;Like the human eyes and brain, DFP uses triangulation between matching points in two views of the same scene at different angles to compute depth.&#160;However, unlike a stereo-based method, DFP uses a digital video projector to replace one of the cameras1. The projector rapidly projects a known sinusoidal pattern onto the subject, and the surface of the subject distorts these patterns in the camera&#8217;s field of view. Three distorted patterns (fringe images) from the camera can be used to compute the depth using triangulation.
Unlike other 3D measurement methods, DFP techniques lead to systems that tend to be faster, lower in equipment cost, more flexible, and easier to develop.&#160;DFP systems can also achieve the same measurement resolution as the camera.&#160;For this reason, DFP and other digital structured light techniques have recently been the focus of intense research (as summarized in1-5). Taking advantage of DFP, the graphics processing unit, and optimized algorithms, we have developed a system capable of 30&#160;Hz 3D video data acquisition, reconstruction, and display for over 300,000 measurement points per frame6,7.&#160;Binary defocusing DFP methods can achieve even greater speeds8.
Diverse applications can benefit from DFP techniques. Our collaborators have used our systems for facial function analysis9, facial animation10, cardiac mechanics studies11, and fluid surface measurements, but many other potential applications exist.&#160;This video will teach the fundamentals of DFP techniques and illustrate the design and operation of a binary defocusing DFP system.

This video describes the fundamentals of digital fringe projection techniques, which provide dense 3D measurements of dynamically changing surfaces.&#160;It also demonstrates the design and operation of a high-speed binary defocusing system based on these techniques.

Digital fringe projection (DFP) techniques provide dense 3D measurements of dynamically changing surfaces.&#160;Like the human eyes and brain, DFP uses ...

科研

工程学

Scalable Nanohelices for Predictive Studies and Enhanced 3D Visualization

Spring-like materials are ubiquitous in nature and of interest in nanotechnology for energy harvesting, hydrogen storage, and biological sensing applications.&#160; For predictive simulations, it has become increasingly important to be able to model the structure of nanohelices accurately.&#160; To study the effect of local structure on the properties of these complex geometries one must develop realistic models.&#160; To date, software packages are rather limited in creating atomistic helical models.&#160; This work focuses on producing atomistic models of silica glass (SiO2) nanoribbons and nanosprings for molecular dynamics (MD) simulations. Using an MD model of &#8220;bulk&#8221; silica glass, two computational procedures to precisely create the shape of nanoribbons and nanosprings are presented.&#160; The first method employs the AWK programming language and open-source software to effectively carve various shapes of silica nanoribbons from the initial bulk model, using desired dimensions and parametric equations to define a helix.&#160; With this method, accurate atomistic silica nanoribbons can be generated for a range of pitch values and dimensions.&#160; The second method involves a more robust code which allows flexibility in modeling nanohelical structures.&#160; This approach utilizes a C++ code particularly written to implement pre-screening methods as well as the mathematical equations for a helix, resulting in greater precision and efficiency when creating nanospring models.&#160; Using these codes, well-defined and scalable nanoribbons and nanosprings suited for atomistic simulations can be effectively created.&#160; An added value in both open-source codes is that they can be adapted to reproduce different helical structures, independent of material.&#160; In addition, a MATLAB graphical user interface (GUI) is used to enhance learning through visualization and interaction for a general user with the atomistic helical structures.&#160; One application of these methods is the recent study of nanohelices via MD simulations for mechanical energy harvesting purposes.

Accurate modeling of nanohelical structures is important for predictive simulation studies leading to novel nanotechnology applications.&#160; Currently, software packages and codes are limited in creating atomistic helical models.&#160; We present two procedures designed to create atomistic nanohelical models for simulations, and a graphical interface to enhance research through visualization.

可扩展的Nanohelices的预测研究和增强的3D可视化

Spring-like materials are ubiquitous in nature and of interest in nanotechnology for energy harvesting, hydrogen storage, and biological sensing ...

Novel 3D/VR Interactive Environment for MD Simulations, Visualization and Analysis

The increasing development of computing (hardware and software) in the last decades has impacted scientific research in many fields including materials science, biology, chemistry and physics among many others. A new computational system for the accurate and fast simulation and 3D/VR visualization of nanostructures is presented here, using the open-source molecular dynamics (MD) computer program LAMMPS. This alternative computational method uses modern graphics processors, NVIDIA CUDA technology and specialized scientific codes to overcome processing speed barriers common to traditional computing methods. In conjunction with a virtual reality system used to model materials, this enhancement allows the addition of accelerated MD simulation capability. The motivation is to provide a novel research environment which simultaneously allows visualization, simulation, modeling and analysis. The research goal is to investigate the structure and properties of inorganic nanostructures (e.g., silica glass nanosprings) under different conditions using this innovative computational system. The work presented outlines a description of the 3D/VR Visualization System and basic components, an overview of important considerations such as the physical environment, details on the setup and use of the novel system, a general procedure for the accelerated MD enhancement, technical information, and relevant remarks. The impact of this work is the creation of a unique computational system combining nanoscale materials simulation, visualization and interactivity in a virtual environment, which is both a research and teaching instrument at UC Merced.

A new computational system featuring GPU-accelerated molecular dynamics simulation and 3D/VR visualization, analysis and manipulation of nanostructures has been implemented, representing a novel approach to advance materials research and promote innovative investigation and alternative methods to learn about material structures with dimensions invisible to the human eye.

新颖的3D / VR互动环境MD模拟，可视化和分析

The increasing development of computing (hardware and software) in the last decades has impacted scientific research in many fields including materials ...

Development of a 3D Graphene Electrode Dielectrophoretic Device

The design and fabrication of a novel 3D electrode microdevice using 50 &#181;m thick graphene paper and 100 &#181;m double sided tape is described. The protocol details the procedures to construct a versatile, reusable, multiple layer, laminated dielectrophoresis chamber. Specifically, six layers of 50 &#181;m x&#160;0.7 cm x&#160;2 cm graphene paper and five layers of double sided tape were alternately stacked together, then clamped to a glass slide. Then a 700 &#956;m diameter micro-well was drilled through the laminated structure using a computer-controlled micro drilling machine. Insulating properties of the tape layer between adjacent graphene layers were assured by resistance tests. Silver conductive epoxy connected alternate layers of graphene paper and formed stable connections between the graphene paper and external copper wire electrodes. The finished device was then clamped and sealed to a glass slide. The electric field gradient was modeled within the multi-layer device. Dielectrophoretic behaviors of 6 &#956;m polystyrene beads were demonstrated in the 1 mm deep micro-well, with medium conductivities ranging from 0.0001 S/m to 1.3 S/m, and applied signal frequencies from 100 Hz to 10 MHz. Negative dielectrophoretic responses were observed in three dimensions over most of the conductivity-frequency space and cross-over frequency values are consistent with previously reported literature values. The device did not prevent AC electroosmosis and electrothermal flows, which occurred in the low and high frequency regions, respectively. The graphene paper utilized in this device is versatile and could subsequently function as a biosensor after dielectrophoretic characterizations are complete.

A microdevice with high throughput potential is used to demonstrate three-dimensional (3D) dielectrophoresis (DEP) with novel materials. Graphene nanoplatelet paper and double sided tape were alternately stacked; a 700 &#956;m micro-well was drilled transverse to the layers. DEP behavior of polystyrene beads was demonstrated in the micro-well.

三维石墨电极介电泳装置的研制

The design and fabrication of a novel 3D electrode microdevice using 50 &#181;m thick graphene paper and 100 &#181;m double sided tape is described. The ...

Energy Dispersive X-ray Tomography for 3D Elemental Mapping of Individual Nanoparticles

Energy dispersive X-ray spectroscopy within the scanning transmission electron microscope (STEM) provides accurate elemental analysis with high spatial resolution, and is even capable of providing atomically resolved elemental maps. In this technique, a highly focused electron beam is incident upon a thin sample and the energy of emitted X-rays is measured in order to determine the atomic species of material within the beam path. This elementally sensitive spectroscopy technique can be extended to three dimensional tomographic imaging by acquiring multiple spectrum images with the sample tilted along an axis perpendicular to the electron beam direction.
Elemental distributions within single nanoparticles are often important for determining their optical, catalytic and magnetic properties. Techniques such as X-ray tomography and slice and view energy dispersive X-ray mapping in the scanning electron microscope provide elementally sensitive three dimensional imaging but are typically limited to spatial resolutions of &gt; 20 nm. Atom probe tomography provides near atomic resolution but preparing nanoparticle samples for atom probe analysis is often challenging. Thus, elementally sensitive techniques applied within the scanning transmission electron microscope are uniquely placed to study elemental distributions within nanoparticles of dimensions 10-100 nm.
Here, energy dispersive X-ray (EDX) spectroscopy within the STEM is applied to investigate the distribution of elements in single AgAu nanoparticles. The surface segregation of both Ag and Au, at different nanoparticle compositions, has been observed.

The use of energy dispersive X-ray tomography in the scanning transmission electron microscope to characterize elemental distributions within single nanoparticles in three dimensions is described.

能量色散X射线断层摄影术对个人纳米3D元素映射

Energy dispersive X-ray spectroscopy within the scanning transmission electron microscope (STEM) provides accurate elemental analysis with high spatial ...

Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence

Experimental methods are presented for measuring the rotational and translational motion of anisotropic particles in turbulent fluid flows. 3D printing technology is used to fabricate particles with slender arms connected at a common center. Shapes explored are crosses (two perpendicular rods), jacks (three perpendicular rods), triads (three rods in triangular planar symmetry), and tetrads (four arms in tetrahedral symmetry). Methods for producing on the order of 10,000 fluorescently dyed particles are described. Time-resolved measurements of their orientation and solid-body rotation rate are obtained from four synchronized videos of their motion in a turbulent flow between oscillating grids with R&#955; = 91. In this relatively low-Reynolds number flow, the advected particles are small enough that they approximate ellipsoidal tracer particles. We present results of time-resolved 3D trajectories of position and orientation of the particles as well as measurements of their rotation rates.

We use 3D printing to fabricate anisotropic particles in the shapes of jacks, crosses, tetrads, and triads, whose alignments and rotations in turbulent fluid flow can be measured from multiple simultaneous video images.

测量的方向和旋转速率方法3D打印在湍流颗粒

Experimental methods are presented for measuring the rotational and translational motion of anisotropic particles in turbulent fluid flows. 3D printing ...

3D Printing of Biomolecular Models for Research and Pedagogy

The construction of physical three-dimensional (3D) models of biomolecules can uniquely contribute to the study of the structure-function relationship. 3D structures are most often perceived using the two-dimensional and exclusively visual medium of the computer screen. Converting digital 3D molecular data into real objects enables information to be perceived through an expanded range of human senses, including direct stereoscopic vision, touch, and interaction. Such tangible models facilitate new insights, enable hypothesis testing, and serve as psychological or sensory anchors for conceptual information about the functions of biomolecules. Recent advances in consumer 3D printing technology enable, for the first time, the cost-effective fabrication of high-quality and scientifically accurate models of biomolecules in a variety of molecular representations. However, the optimization of the virtual model and its printing parameters is difficult and time consuming without detailed guidance. Here, we provide a guide on the digital design and physical fabrication of biomolecule models for research and pedagogy using open source or low-cost software and low-cost 3D printers that use fused filament fabrication technology.

Physical models of biomolecules can facilitate an understanding of their structure-function for the researcher, aid in communication between researchers, and serve as an educational tool in pedagogical endeavors. Here, we provide detailed guidance for the 3D printing of accurate models of biomolecules using fused filament fabrication desktop 3D printers.

生物分子模型的3D打印技术的研究与教学

The construction of physical three-dimensional (3D) models of biomolecules can uniquely contribute to the study of the structure-function relationship. 3D ...

A 3D-printed Chamber for Organic Optoelectronic Device Degradation Testing

In this manuscript, we outline the manufacture of a small, portable, easy-to-use atmospheric chamber for organic and perovskite optoelectronic devices, using 3D-printing. As these types of devices are sensitive to moisture and oxygen, such a chamber can aid researchers in characterizing the electronic and stability properties. The chamber is intended to be used as a temporary, reusable, and stable environment with controlled properties (including humidity, gas introduction, and temperature). It can be used to protect air-sensitive materials or to expose them to contaminants in a controlled way for degradation studies. To characterize the properties of the chamber, we outline a simple procedure to determine the water vapor transmission rate (WVTR) using relative humidity as measured by a standard humidity sensor. This standard operating procedure, using a 50% infill density of polylactic acid (PLA), results in a chamber that can be used for weeks without any significant loss of device properties. The versatility and ease of use of the chamber allows it to be adapted to any characterization condition that requires a compact-controlled atmosphere.

Here, we present a protocol for the design, manufacture, and use of a simple, versatile 3D-printed and controlled atmospheric chamber for the optical and electrical characterization of air-sensitive organic optoelectronic devices.

用于有机光电器件降解测试的3维印制腔

In this manuscript, we outline the manufacture of a small, portable, easy-to-use atmospheric chamber for organic and perovskite optoelectronic devices, ...

A Soft Tooling Process Chain for Injection Molding of a 3D Component with Micro Pillars

The purpose of this paper is to present the method of a soft tooling process chain employing Additive Manufacturing (AM) for fabrication of injection molding inserts with micro surface features. The Soft Tooling inserts are manufactured by Digital Light Processing (vat photo polymerization) using a photopolymer that can withstand relatively high temperaturea. The part manufactured here has four tines with an angle of 60&#176;. Micro pillars (&#216;200 &#181;m, aspect ratio of 1) are arranged on the surfaces by two rows. Polyethylene (PE) injection molding with the soft tooling inserts is used to fabricate the final parts. This method demonstrates that it is feasible to obtain injection-molded parts with microstructures on complex geometry by additive manufactured inserts. The machining time and cost is reduced significantly compared to conventional tooling processes based on computer numerical control (CNC) machining. The dimensions of the micro features are influenced by the applied additive manufacturing process. The lifetime of the inserts determines that this process is more suitable for pilot production. The precision of the inserts production is limited by the additive manufacturing process as well.

A protocol for fabricating injection molding inserts for complex geometry with micro features on surfaces employing Additive Manufacturing (AM) is presented.

微柱3D 构件注塑成型的软加工工艺链

The purpose of this paper is to present the method of a soft tooling process chain employing Additive Manufacturing (AM) for fabrication of injection ...

Multi-material Ceramic-Based Components &#8211; Additive Manufacturing of Black-and-white Zirconia Components by Thermoplastic 3D-Printing (CerAM - T3DP)

To combine the benefits of Additive Manufacturing (AM) with the benefits of Functionally Graded Materials (FGM) to ceramic-based 4D components (three dimensions for the geometry and one degree of freedom concerning the material properties at each position) the Thermoplastic 3D-Printing (CerAM -&#160;T3DP) was developed. It is a direct AM technology which allows the AM of multi-material components. To demonstrate the advantages of this technology black-and-white zirconia components were additively manufactured and co-sintered defect-free.
Two different pairs of black and white zirconia powders were used to prepare different thermoplastic suspensions. Appropriate dispensing parameters were investigated to manufacture single-material test components and adjusted for the additive manufacturing of multi-color zirconia components.

Here we describe a protocol for additively manufacturing black-and-white zirconia components by Thermoplastic 3D-Printing (CerAM -&#160;T3DP) and co-sintering defect-free.

多材料陶瓷基元器件--用热塑性3d 印刷 (ceram-t3dp) 制备黑白氧化锆部件的添加剂

To combine the benefits of Additive Manufacturing (AM) with the benefits of Functionally Graded Materials (FGM) to ceramic-based 4D components (three ...