SPIE Micro + Nano Materials, Devices, and Applications最新文献

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2023-03-13 DOI: 10.1117/12.424404

V. Ramakrishnan, K. Ramesh, S. Bang

{"title":"Bacterial concrete","authors":"V. Ramakrishnan, K. Ramesh, S. Bang","doi":"10.1117/12.424404","DOIUrl":"https://doi.org/10.1117/12.424404","url":null,"abstract":"Cracks in concrete are inevitable and are one of the inherent weaknesses of concrete. Water and other salts seep through these cracks, corrosion initiates, and thus reduces the life of concrete. So there was a need to develop an inherent biomaterial, a self-repairing material which can remediate the cracks and fissures in concrete. Bacterial concrete is a material, which can successfully remediate cracks in concrete. This technique is highly desirable because the mineral precipitation induced as a result of microbial activities is pollution free and natural. As the cell wall of bacteria is anionic, metal accumulation (calcite) on the surface of the wall is substantial, thus the entire cell becomes crystalline and they eventually plug the pores and cracks in concrete. This paper discusses the plugging of artificially cracked cement mortar using Bacillus Pasteurii and Sporosarcina bacteria combined with sand as a filling material in artificially made cuts in cement mortar which was cured in urea and CaCl2 medium. The effect on the compressive strength and stiffness of the cement mortar cubes due to the mixing of bacteria is also discussed in this paper. It was found that use of bacteria improves the stiffness and compressive strength of concrete. Scanning electron microscope (SEM) is used to document the role of bacteria in microbiologically induced mineral precipitation. Rod like impressions were found on the face of calcite crystals indicating the presence of bacteria in those places. Energy- dispersive X-ray (EDX) spectra of the microbial precipitation on the surface of the crack indicated the abundance of calcium and the precipitation was inferred to be calcite (CaCO3).","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"401 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116657476","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: 49

Mesoscopic effects in discretised metamaterial spheres 离散超材料球中的介观效应

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-23 DOI: 10.1117/12.2202561

M. Lapine, C. Poulton, R. McPhedran

引用次数: 0

Damage monitoring using fiber optic sensors and by analysing electro-mechanical admittance signatures obtained from piezo sensor 利用光纤传感器和分析压电传感器获得的机电导纳特征进行损伤监测

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202547

Muneesh Maheshwari, V. Annamdas, J. Pang, S. Tjin, A. Asundi

{"title":"Damage monitoring using fiber optic sensors and by analysing electro-mechanical admittance signatures obtained from piezo sensor","authors":"Muneesh Maheshwari, V. Annamdas, J. Pang, S. Tjin, A. Asundi","doi":"10.1117/12.2202547","DOIUrl":"https://doi.org/10.1117/12.2202547","url":null,"abstract":"Damage monitoring is the need of the hour in this age of infrastructure. Many methods are being used for damage monitoring in different mechanical and civil structures. Some of them are strain based methods in which abruptly increased strain signifies the presence of damage in the structure. This article focuses on crack monitoring of a fixedfixed beam using fiber optic sensors which can measure strain locally or globally. The two types of fiber optic sensors used in this research are fiber Bragg grating (FBG) and fiber optic polarimetric sensors (FOPS). FBG and FOPS are used for local strain monitoring (at one point only) and global strain monitoring (in the entire specimen) respectively. At the centre of the specimen, a piezoelectric wafer active sensor (PWAS) is also attached. PWAS is used to obtain electromechanical admittance (EMA) signatures. Further, these EMA signatures are analysed to access the damage state in the beam. These multiple smart materials together provide improved information on damages in the specimen which is very valuable for the structural health monitoring (SHM) of the specimen.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124896477","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

Preparation and imaging performance of nanoparticulated LuPO4:Eu semitransparent films under x-ray radiation 纳米关节LuPO4:Eu半透明膜的制备及其x射线成像性能

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202535

I. Seferis, J. Zeler, C. Michail, I. Valais, G. Fountos, N. Kalyvas, A. Bakas, I. Kandarakis, G. Panayiotakis, E. Zych

{"title":"Preparation and imaging performance of nanoparticulated LuPO4:Eu semitransparent films under x-ray radiation","authors":"I. Seferis, J. Zeler, C. Michail, I. Valais, G. Fountos, N. Kalyvas, A. Bakas, I. Kandarakis, G. Panayiotakis, E. Zych","doi":"10.1117/12.2202535","DOIUrl":"https://doi.org/10.1117/12.2202535","url":null,"abstract":"The aim of the present work was to demonstrate the fabrication technique for semitransparent layers of nanoparticulated (~50 nm) LuPO4:15%Eu phosphors. Furthermore, to present their basic luminescent properties and provide results regarding their performance in a planar imaging system incorporating a CMOS photodetector. Parameters such as the Detective Quantum Efficiency (DQE), the Normalized Noise Power Spectrum (NNPS) and the Modulation Transfer Function (MTF), were investigated. The NNPS was found to present significantly higher values near the zero frequency for the 67 μm, 100 μm films, pointing on their higher non uniformities compared to the 220 and 460 μm films For the two thickest films (460 μm and 220 μm) the MTF curves practically do not differ, while MTFs for the thinner layers of 100 μm and 67 μm are higher as the layer’s thickness decreases. The higher DQE values observed for the 220 μm and 460 μm films up to medium frequencies, while at high frequencies the DQE values are comparable. Although the MTF values of these films are much lower than the thinner screens, the capability of the higher x-ray absorption, in conjunction with the low noise properties, lead to higher DQE values. The LuPO4:Eu semitransparent films seems to be a very promising scintillator for stationary x-ray imaging. The acquired data allow to predict that high-temperature sintering of our films under pressure may help to improve their imaging quality, since such a processing should increase the luminescence efficiency without significant growth of the grains, and thus without sacrificing their translucent character.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122352409","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: 1

Efficient butt-coupling of surface plasmons on a silver-air interface 银-空气界面表面等离子体的高效对接耦合

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202452

Caitlin Fisher, L. Botten, C. Poulton, R. McPhedran, C. D. de Sterke

引用次数: 0

Enhanced water vapour flow in silica microchannels and interdiffusive water vapour flow through anodic aluminium oxide (AAO) membranes 二氧化硅微通道中增强的水蒸气流动和阳极氧化铝(AAO)膜间扩散的水蒸气流动

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202469

Wenwen Lei, D. Mckenzie

引用次数: 0

3D printed polymers toxicity profiling: a caution for biodevice applications 3D打印聚合物毒性分析:生物器械应用的警告

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202392

F. Zhu, J. Skommer, Timo Friedrich, J. Kaslin, D. Wlodkowic

{"title":"3D printed polymers toxicity profiling: a caution for biodevice applications","authors":"F. Zhu, J. Skommer, Timo Friedrich, J. Kaslin, D. Wlodkowic","doi":"10.1117/12.2202392","DOIUrl":"https://doi.org/10.1117/12.2202392","url":null,"abstract":"A recent revolution in additive manufacturing technologies and access to 3D Computer Assisted Design (CAD) software has spurred an explosive growth of new technologies in biomedical engineering. This includes biomodels for diagnosis, surgical training, hard and soft tissue replacement, biodevices and tissue engineering. Moreover, recent developments in high-definition additive manufacturing systems such as Multi-Jet Modelling (MJM) and Stereolithography (SLA), capable of reproducing feature sizes close to 100 μm, promise brand new capabilities in fabrication of optical-grade biomicrofluidic Lab-on-a-Chip and MEMS devices. Compared with other rapid prototyping technologies such as soft lithography and infrared laser micromachining in PMMA, SLA and MJM systems can enable user-friendly production of prototypes, superior feature reproduction quality and comparable levels of optical transparency. Prospectively they can revolutionize fabrication of microfluidic devices with complex geometric features and eliminate the need to use clean room environment and conventional microfabrication techniques. In this work we demonstrate preliminary data on toxicity profiling of a panel of common polymers used in 3D printing applications. The main motivation of our work was to evaluate toxicity profiles of most commonly used polymers using standardized biotests according to OECD guidelines for testing of chemic risk assessment. Our work for the first time provides a multispecies view of potential dangers and limitation for building biocompatible devices using FDM, SLA and MJM additive manufacturing systems. Our work shows that additive manufacturing holds significant promise for fabricating LOC and MEMS but requires caution when selecting systems and polymers due to toxicity exhibited by some 3D printing polymers.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129090203","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: 30

Misalignment tolerant efficient inverse taper coupler for silicon waveguide 硅波导容错高效反锥耦合器

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202494

Peng Wang, A. Michael, C. Kwok, Ssu-Han Chen

引用次数: 0

Dynamic control of THz waves through thin-film transistor metamaterials 薄膜晶体管超材料对太赫兹波的动态控制

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202359

F. Ren, Weizong Xu, Hai Lu, Jiandong Ye, H. Tan, C. Jagadish

引用次数: 0

Acellular organ scaffolds for tumor tissue engineering 肿瘤组织工程用脱细胞器官支架

SPIE Micro + Nano Materials, Devices, and Applications Pub Date : 2015-12-22 DOI: 10.1117/12.2202473

Anna E Guller, I. Trusova, Elena Petersen, A. Shekhter, A. Kurkov, Yi Qian, A. Zvyagin

{"title":"Acellular organ scaffolds for tumor tissue engineering","authors":"Anna E Guller, I. Trusova, Elena Petersen, A. Shekhter, A. Kurkov, Yi Qian, A. Zvyagin","doi":"10.1117/12.2202473","DOIUrl":"https://doi.org/10.1117/12.2202473","url":null,"abstract":"Rationale: Tissue engineering (TE) is an emerging alternative approach to create models of human malignant tumors for experimental oncology, personalized medicine and drug discovery studies. Being the bottom-up strategy, TE provides an opportunity to control and explore the role of every component of the model system, including cellular populations, supportive scaffolds and signalling molecules. Objectives: As an initial step to create a new ex vivo TE model of cancer, we optimized protocols to obtain organ-specific acellular matrices and evaluated their potential as TE scaffolds for culture of normal and tumor cells. Methods and results: Effective decellularization of animals’ kidneys, ureter, lungs, heart, and liver has been achieved by detergent-based processing. The obtained scaffolds demonstrated biocompatibility and growthsupporting potential in combination with normal (Vero, MDCK) and tumor cell lines (C26, B16). Acellular scaffolds and TE constructs have been characterized and compared with morphological methods. Conclusions: The proposed methodology allows creation of sustainable 3D tumor TE constructs to explore the role of organ-specific cell-matrix interaction in tumorigenesis.","PeriodicalId":320411,"journal":{"name":"SPIE Micro + Nano Materials, Devices, and Applications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124509228","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