Smart Materials, Nano-, and Micro- Smart Systems最新文献_第2页

Hydrophobicity studies of polymer thin films with varied CNT concentration 不同碳纳米管浓度聚合物薄膜的疏水性研究

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2034283

N. H. M. Rodzi, M. M. Shahimin, P. Poopalan, B. Man, M. N. M. Nor

{"title":"Hydrophobicity studies of polymer thin films with varied CNT concentration","authors":"N. H. M. Rodzi, M. M. Shahimin, P. Poopalan, B. Man, M. N. M. Nor","doi":"10.1117/12.2034283","DOIUrl":"https://doi.org/10.1117/12.2034283","url":null,"abstract":"Surface functionalization studies for re-creating a ‘Lotus Leaf’ effect (superhydrophobic) have been carried out for the past decade; looking for the material which can provide high transparency, low energy surface and high surface roughness. Fabrication of polydimethylsiloxane (PDMS) and multiwalled carbon nanotubes (MWCNT) hybrid thin film variations on glass to produce near-superhydrophobic surfaces is presented in this paper. There are three important parameters studied in producing hydrophobic surfaces based on the hybrid thin films; concentration of PDMS, concentration of MWCNT and droplet sizes. The study is carried out by using PDMS of varied cross linker ratio (10:1, 30:1 and 50:1) with MWCNT concentration of 1mg, 10mg and 15mg for 0.5 μl, 2.0 μl, 5.0 μl and 10 μl droplet sizes. The resulting hybrid thin films show that hydrophobicity increased with increasing cross linker ratio and MWCNT percentage in the PDMS solution. A near superhydrophobic surface can be created when using 15 mg of MWCNT with 50:1 cross linker ratio PDMS thin films, measured on 10 μl droplet size. The hybrid thin films produced can be potentially tailored to the application of biosensors, MEMS and even commercial devices.","PeriodicalId":334178,"journal":{"name":"Smart Materials, Nano-, and Micro- Smart Systems","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124577226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Fabrication and replication of micro-optical structures for growth of GaN-based light emitting diodes gan基发光二极管生长微光学结构的制备与复制

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2033709

G. Gervinskas, G. Seniutinas, A. Vijayakumar, S. Bhattacharya, E. Jelmakas, A. Kadys, R. Tomašiūnas, S. Juodkazis

引用次数: 3

Shape optimization of electrostatically driven microcantilevers using simulated annealing to enhance static travel range 利用模拟退火优化静电微悬臂梁的形状以提高其静态行程范围

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2033784

R. Trivedi, M. Joglekar, R. Shimpi, D. N. Pawaskar

{"title":"Shape optimization of electrostatically driven microcantilevers using simulated annealing to enhance static travel range","authors":"R. Trivedi, M. Joglekar, R. Shimpi, D. N. Pawaskar","doi":"10.1117/12.2033784","DOIUrl":"https://doi.org/10.1117/12.2033784","url":null,"abstract":"The objective of this paper is to present a systematic development of the generic shape optimization of elec- trostatically actuated microcantilever beams for extending their static travel range. Electrostatic actuators are widely used in micro electro mechanical system (MEMS) devices because of low power density and ease of fab- rication. However, their useful travel range is often restricted by a phenomenon known as pull-in instability. The Rayleigh- Ritz energy method is used for computation of pull-in parameters which includes electrostatic potential and fringing field effect. Appropriate width function and linear thickness functions are employed along the length of the non-prismatic beam to achieve enhanced travel range. Parameters used for varying the thick- ness and width functions are optimized using simulated annealing with pattern search method towards the end to refine the results. Appropriate penalties are imposed on the violation of volume, width, thickness and area constraints. Nine test cases are considered for demonstration of the said optimization method. Our results indicate that around 26% increase in the travel range of a non-prismatic beam can be achieved after optimiza- tion compared to that in a prismatic beam having the same volume. Our results also show an improvement in the pull-in displacement of around 5% compared to that of a variable width constant thickness actuator. We show that simulated annealing is an effective and flexible method to carry out design optimization of structural elements under electrostatic loading.","PeriodicalId":334178,"journal":{"name":"Smart Materials, Nano-, and Micro- Smart Systems","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131078375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Fabrication of Fresnel zone plate lens in fused silica glass using femtosecond laser lithography technology 用飞秒激光光刻技术在熔融石英玻璃中制备菲涅耳带板透镜

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2033766

I. Sohn, Md. Shamim Ahsan, Y. Noh, Hun-Kook Choi, Jin-Tae Kim, M. Ko

{"title":"Fabrication of Fresnel zone plate lens in fused silica glass using femtosecond laser lithography technology","authors":"I. Sohn, Md. Shamim Ahsan, Y. Noh, Hun-Kook Choi, Jin-Tae Kim, M. Ko","doi":"10.1117/12.2033766","DOIUrl":"https://doi.org/10.1117/12.2033766","url":null,"abstract":"This paper demonstrates mask-less formation of Fresnel zone plate lens on the surface of a fused silica glass substrate using femtosecond laser lithography technology. The lens consists of a series of concentric rings, which has been fabricated on the glass surface by femtosecond laser writing followed by chemical etching and stripping. We also pattern Fresnel zone plate on fused silica glass surface using direct femtosecond laser writing technique. The both Fresnel zone plate lenses have a focal length of 50 mm. Femtosecond laser lithography technique offers smooth patterning of materials compared to traditional femtosecond laser writing. Consequently, femtosecond laser lithography induced Fresnel zone plate lens yields considerably high diffraction efficiency. Using these Fresnel zone plate lenses, we are able to observe the micro-letters, micro-machined on aluminum coated poly-methylmethacrylate (PMMA) surface indicating excellent focusing and imaging capability of the Fresnel zone plate lenses. The proposed mask-less technology is simple compared to other lithography techniques, which shows great potential for small-scale manufacturing of similar kinds of optical devices.","PeriodicalId":334178,"journal":{"name":"Smart Materials, Nano-, and Micro- Smart Systems","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134624773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Integrated microdroplet-based system for enzyme synthesis and sampling 基于微滴的酶合成和采样集成系统

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2033569

F. Lapierre, M. Best, R. Stewart, J. Oakeshott, T. Peat, Yonggang Zhu

{"title":"Integrated microdroplet-based system for enzyme synthesis and sampling","authors":"F. Lapierre, M. Best, R. Stewart, J. Oakeshott, T. Peat, Yonggang Zhu","doi":"10.1117/12.2033569","DOIUrl":"https://doi.org/10.1117/12.2033569","url":null,"abstract":"Microdroplet-based microfluidic devices are emerging as powerful tools for a wide range of biochemical screenings and analyses. Monodispersed aqueous microdroplets from picoliters to nanoliters in volume are generated inside microfluidic channels within an immiscible oil phase. This results in the formation of emulsions which can contain various reagents for chemical reactions and can be considered as discrete bioreactors. In this paper an integrated microfluidic platform for the synthesis, screening and sorting of libraries of an organophosphate degrading enzyme is presented. The variants of the selected enzyme are synthesized from a DNA source using in-vitro transcription and translation method. The synthesis occurs inside water-in-oil emulsion droplets, acting as bioreactors. Through a fluorescence based detection system, only the most efficient enzymes are selected. All the necessary steps from the enzyme synthesis to selection of the best genes (producing the highest enzyme activity) are thus integrated inside a single and unique device. In the second part of the paper, an innovative design of the microfluidic platform is presented, integrating an electronic prototyping board for ensuring the communication between the various components of the platform (camera, syringe pumps and high voltage power supply), resulting in a future handheld, user-friendly, fully automated device for enzyme synthesis, screening and selection. An overview on the capabilities as well as future perspectives of this new microfluidic platform is provided.","PeriodicalId":334178,"journal":{"name":"Smart Materials, Nano-, and Micro- Smart Systems","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124309293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface acoustic streaming in microfluidic system for rapid multicellular tumor spheroids generation 多细胞肿瘤球体快速生成的微流控系统表面声流

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2034050

Layla Alhasan, A. Qi, Aswan Al-Aboodi, A. Rezk, Richie R. Shilton, P. Chan, J. Friend, L. Yeo

{"title":"Surface acoustic streaming in microfluidic system for rapid multicellular tumor spheroids generation","authors":"Layla Alhasan, A. Qi, Aswan Al-Aboodi, A. Rezk, Richie R. Shilton, P. Chan, J. Friend, L. Yeo","doi":"10.1117/12.2034050","DOIUrl":"https://doi.org/10.1117/12.2034050","url":null,"abstract":"In this study, we developed a novel and rapid method to generate in vitro three-dimensional (3D) multicellular tumor spheroids using a surface acoustic wave (SAW) device. A SAW device with single-phase unidirectional transducer electrodes (SPUTD) on lithium niobate substrate was fabricated using standing UV photolithography and wet-etching techniques. To generate spheroids, the SAW device was loaded with medium containing human breast carcinoma (BT474) cells, an oscillating electrical signal at resonant frequency was supplied to the SPUDT to generate acoustic radiation in the medium. Spheroids with uniform size and shape can be obtained using this method in less than 1 minute, and the size of the spheroids can be controlled through adjusting the seeding density. The resulting spheroids were used for further cultivation and were monitored using an optical microscope in real time. The viability and actin organization of the spheroids were assessed using live/dead viability staining and actin cytoskeleton staining, respectively. Compared to spheroids generated using the liquid overlay method, the SAW generated spheroids exhibited higher circularity and higher viability. The F-actin filaments of spheroids appear to aggregate compared to that of untreated cells, indicating that mature spheroids can be obtained using this method. This spheroid generating method can be useful for a variety of biological studies and clinical applications.","PeriodicalId":334178,"journal":{"name":"Smart Materials, Nano-, and Micro- Smart Systems","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114366302","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Development of a multi-flash lamp in pulse photo conductivity method 脉冲光导法中多闪光灯的研制

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2033813

J. Fukashi, J. Ndagijimana, Y. Soh, K. Kobayashi, M. Furuta, H. Kubota

引用次数: 1

Translation interference pattern in nano-scale precision by phase control based on spatial light modulator 基于空间光调制器相位控制的纳米精度平移干涉图样

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2033728

Jie Ma, Y. Zhong, Zhe Chen, K. Wong

引用次数: 0

Eye trackers in an oculary clinical setting 眼动仪在眼科临床中的应用

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2033518

M. M. Shahimin, M. Shahimin

引用次数: 3

Solution processing of next-generation nanocrystal solar cells 新一代纳米晶太阳能电池的溶液处理

Smart Materials, Nano-, and Micro- Smart Systems Pub Date : 2013-12-07 DOI: 10.1117/12.2034067

J. van Embden, A. Chesman, N. Duffy, E. Della Gaspera, J. Jasieniak

{"title":"Solution processing of next-generation nanocrystal solar cells","authors":"J. van Embden, A. Chesman, N. Duffy, E. Della Gaspera, J. Jasieniak","doi":"10.1117/12.2034067","DOIUrl":"https://doi.org/10.1117/12.2034067","url":null,"abstract":"Next-generation solar cells will be fabricated from low-cost and earth abundant elements, using processes that are amenable to printing on a variety of light-weight substrates. The utilization of compositionally and structurally controlled colloidal nanocrystals as building blocks for such devices fulfills these criteria. Our recent efforts in developing kesterite Cu2ZnSnS4 (CZTS) nanocrystals, one of the most promising materials to emerge in this area, enable the deposition of CZTS thin-films directly from a variety of solution-processed methods. Nanocrystalline thin films possess poor electronic properties, which precludes their use in solar cell devices. In order to overcome this, thermal treatment steps under an atmosphere of vaporous selenium are applied to induce large scale crystallite growth and the production of selenized CZTSSe films. This process results in a highly photoactive p-type layer. The n-type cadmium sulfide layer is also deposited from solution using chemical bath deposition. We will discuss each of these accomplishments in detail, highlighting the significant challenges that need to be overcome in order to fabricate working CZTSSe thin film solar cells.","PeriodicalId":334178,"journal":{"name":"Smart Materials, Nano-, and Micro- Smart Systems","volume":"8923 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129896676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0