Micro and Nano Systems Letters最新文献_第5页

Unidirectional freeze casting of compressible metallic aerogel composed of freeze-dried cellulose nanofibers and silver nanowires 由冻干纤维素纳米纤维和银纳米线组成的可压缩金属气凝胶的单向冷冻铸造

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-12-14 DOI: 10.1186/s40486-023-00189-4

Donghyun Lee, Jungwook Choi

{"title":"Unidirectional freeze casting of compressible metallic aerogel composed of freeze-dried cellulose nanofibers and silver nanowires","authors":"Donghyun Lee, Jungwook Choi","doi":"10.1186/s40486-023-00189-4","DOIUrl":"10.1186/s40486-023-00189-4","url":null,"abstract":"<div><p>Metallic aerogels have attracted tremendous interest because of their superior properties, such as low density, high electrical conductivity, and large specific surface area. However, extremely brittle connections in their 3D networks remain a challenge. In this study, compressible aerogels with microporous fiber-like structure consisting of freeze-dried cellulose nanofibers (CNFs) and silver nanowires (AgNWs) were fabricated by unidirectional freeze-casting process. To improve the robustness, elasticity, and deformability of the aerogel, freeze-dried microfiber-structured CNFs assembled with AgNWs were used. The freeze-dried CNF/AgNW-based aerogels exhibited a low density (8.51–13.5 mg/cm<sup>3</sup>) and high porosity (up to 98.2%). Furthermore, these aerogels demonstrated impressive mechanical properties with high compressive strength (up to 4.85 kPa at 70% strain), elastic modulus (up to 16.3 kPa), and yield strength (up to 2 kPa). Additionally, the aerogels exhibited reversible deformability up to a 10% strain and maintained their durability over 200 cycles of compressive strain at 10%. The fabricated aerogels also showed a low electrical resistivity (< 8.65 mΩ·m) in addition to robust and compressible mechanical properties. These aerogels are expected to be useful in a wide range of applications that require characteristics such as light weight, high compressive strength, high elasticity, and low electrical resistivity.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00189-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138631995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visual and tactile perception techniques for braille recognition 盲文识别的视觉和触觉感知技术

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-12-14 DOI: 10.1186/s40486-023-00191-w

Byeong-Sun Park, Seong-Min Im, Hojun Lee, Young Tack Lee, Changjoo Nam, Sungeun Hong, Min-gu Kim

{"title":"Visual and tactile perception techniques for braille recognition","authors":"Byeong-Sun Park, Seong-Min Im, Hojun Lee, Young Tack Lee, Changjoo Nam, Sungeun Hong, Min-gu Kim","doi":"10.1186/s40486-023-00191-w","DOIUrl":"10.1186/s40486-023-00191-w","url":null,"abstract":"<div><p>In the case of a visually impaired person, literal communication often relies on braille, a system predominantly dependent on vision and touch. This study entailed the development of a visual and tactile perception technique for braille character recognition. In the visual perception approach, a braille character recognition was performed using a deep learning model (Faster R-CNN–FPN–ResNet-50), based on custom-made braille dataset collected through data augmentation and preprocessing. The attained performance was indicated by an mAP50 of 94.8 and mAP75 of 70.4 on the generated dataset. In the tactile perception approach, a braille character recognition was performed using a flexible capacitive pressure sensor array. The sensor size and density were designed according to braille standards, and a single sensor with a size of 1.5 mm × 1.5 mm was manufactured into a 5 × 5 sensor array by using a printing technique. Additionally, the sensitivity was improved by incorporating a pressure-sensitive micro dome-structured array layer. Finally, braille character recognition was visualized in the form of a video-based heatmap. These results will potentially be a cornerstone in developing assistive technology for the visually impaired through the fusion of visual-tactile sensing technology.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00191-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138631770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sense-based user interface platform for behavioral pattern analysis of young children 基于感知的幼儿行为模式分析用户界面平台

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-12-06 DOI: 10.1186/s40486-023-00186-7

Sangmin Lee, Jaehwan Jang, Young Tack Lee, Min-gu Kim

{"title":"Sense-based user interface platform for behavioral pattern analysis of young children","authors":"Sangmin Lee, Jaehwan Jang, Young Tack Lee, Min-gu Kim","doi":"10.1186/s40486-023-00186-7","DOIUrl":"10.1186/s40486-023-00186-7","url":null,"abstract":"<div><p>This paper presents a system integration of a sense-based user interface (SUI) platform, comprised of flexible pressure and humidity sensor arrays with a commercial inertial measurement unit (IMU), to analyze behavioral patterns of young children. The pressure sensors utilize a sensor array created using flexible inkjet printing, with each sensor using a piezoresistive sensing layer. The humidity sensors employ an interdigitated capacitive sensor based on a polyimide humidity-sensitive layer and are also manufactured using the flexible inkjet printing technique. To achieve a wide measurement area, both the pressure and humidity sensors are expanded into 5 × 5 and 5 × 10 sensor arrays, respectively. Also, commercial IMU, including accelerometer/gyroscope sensors, is employed. Finally, the SUI platform is in the form of a cuboidal block model, with an IMU and circuits embedded within the block. Multilayered pressure and humidity sensor arrays are installed on the external surface of the block. Collected data from each sensor are visualized through heatmaps and 3D motion representation to create a platform that integrates fine-grained behavior as well as global behavior information of young children. This research would provide a foundation for the development of SUI technology, especially aimed at individuals who have difficulty with conventional forms of input–output devices.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00186-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138491278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dispersion and agglomeration of carbon nanoclusters in 4-(trans-4′-hexylcyclohexyl)-isothiocyanatobenzene media on ITO and graphene surfaces: role of surface effect 碳纳米团簇在4-(反式-4 ' -己基环己基)-异硫氰酸苯介质中在ITO和石墨烯表面的分散和团聚:表面效应的作用

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-11-30 DOI: 10.1186/s40486-023-00182-x

Archana Kumari Singh, Satya Pal Singh

{"title":"Dispersion and agglomeration of carbon nanoclusters in 4-(trans-4′-hexylcyclohexyl)-isothiocyanatobenzene media on ITO and graphene surfaces: role of surface effect","authors":"Archana Kumari Singh, Satya Pal Singh","doi":"10.1186/s40486-023-00182-x","DOIUrl":"10.1186/s40486-023-00182-x","url":null,"abstract":"<div><p>We have synthesized carbon nanoparticles using mandarin juice via green synthesis rout. We have doped carbon nanoparticles in liquid crystal media and studied the surface effect on self-assembly of carbon nanoclusters on ITO coated glass surface and on graphene sheet. The purpose of this study is to construct uniform nano-micro droplets for novel applications and to understand and explore the underlying science behind molecular scale reorganization in the presence of functional surfaces like graphene. We have used density functional theory approach to confirm that the carbon nanoparticles in globular structures are dispersed in presence of graphene sheet due to chemical interaction of carbon rings (or say carbon nanoparticles) with graphene carbon atoms. In order to minimize the free energy, the carbon nanoparticles leave the carbon globular structures and are dispersed to form rectangular structures in presence of LC media at graphene surface. The carbon nanoparticles are dispersed to increase contact area with graphene surface. The results are useful in construction of desired nano-micro structures for possible novel purposes in medical field since carbon nanoparticles are biocompatible. Optical microscopy, FESEM, NMR and UV spectra verifies the droplet formation and its effect on the surface and electronic properties of carbon nanoparticles.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00182-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138468365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of an amperometric sensor for epinephrine determination using an Azure A/silver nanocluster modified electrode 采用Azure A/银纳米簇修饰电极的肾上腺素测定安培传感器的研制

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-11-29 DOI: 10.1186/s40486-023-00174-x

C. Priya, S. Anuja, R. Suresh Babu, S. Sriman Narayanan

{"title":"Development of an amperometric sensor for epinephrine determination using an Azure A/silver nanocluster modified electrode","authors":"C. Priya, S. Anuja, R. Suresh Babu, S. Sriman Narayanan","doi":"10.1186/s40486-023-00174-x","DOIUrl":"10.1186/s40486-023-00174-x","url":null,"abstract":"<div><p>A novel electrochemical sensor was developed for the detection of Epinephrine (EP) utilizing Azure A (AzA), a phenothiazine dye, and citrate-capped silver nanoparticles. The interaction between Azure A and silver nanoparticles facilitated the formation of AzA/silver nanoclusters through a self-assembled approach. The morphological analysis of AzA/silver nanoclusters was conducted using field-emission scanning electron microscopy (FESEM). The nanoclusters were then immobilized on a graphite electrode via a simple drop-casting method, resulting in a modified electrode. The electrochemical properties of the modified electrode were investigated using cyclic voltammetry and linear sweep voltammetry techniques. The modified electrode exhibited enhanced electrocatalytic oxidation of EP at a lower oxidation potential of 0.27 V. The electrochemical analysis demonstrated that the modified electrode functioned as an amperometric sensor, enabling the detection of EP within a concentration range of 4.6 × 10<sup>–7</sup> to 3.6 × 10<sup>–3</sup> M, with a correlation coefficient of 0.9950 and a detection limit of 2.2 × 10<sup>–7</sup> M (S/N = 3). The modified electrode exhibited excellent selectivity, sensitivity, and a remarkably low detection limit, making it highly suitable for EP determination. Its ease of preparation further adds to the practicality and potential applications of this electrode.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00174-x","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138454643","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microfluidic thrombosis analysis system: possibilities and limitations 微流控血栓分析系统:可能性与局限性

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-11-23 DOI: 10.1186/s40486-023-00185-8

Dong-Hwi Ham, Ji-Seob Choi, Jin-Ho Choi, Woo-Tae Park

{"title":"Microfluidic thrombosis analysis system: possibilities and limitations","authors":"Dong-Hwi Ham, Ji-Seob Choi, Jin-Ho Choi, Woo-Tae Park","doi":"10.1186/s40486-023-00185-8","DOIUrl":"10.1186/s40486-023-00185-8","url":null,"abstract":"<div><p>Thrombosis is a double-edged sword. Normal thrombus formation within injured blood vessel is an important natural defensive mechanism to prevent excessive bleeding, whereas abnormal thrombus formation leads to critical disease such as stroke or myocardial infarction. One of keys in the pathophysiology mechanism involved in the thrombus formation is acute hemodynamic changes within the vessel lumen, which has been investigated mostly in pre-clinical and clinical studies. However, studies involving animal or human subjects are frequently limited by technical difficulties and requirement of substantial blood volume. Microfluidic systems have emerged as a valuable tool owing to their inherent advantages including minimal sample requirements and rapid analysis capabilities. In this mini review, we present a summary of microfluidic systems designed for thrombosis analysis, encompassing fabrication processes, design, and analysis methods. We also discuss both the potentials and limitations of microfluidic platform for the analysis of thrombus mechanisms.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00185-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138431627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Silicon nanoparticles: fabrication, characterization, application and perspectives 硅纳米颗粒:制备、表征、应用与展望

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-11-23 DOI: 10.1186/s40486-023-00184-9

Taeyeong Kim, Jungchul Lee

引用次数: 0

Plasma dicing before grinding process for highly reliable singulation of low-profile and large die sizes in advanced packages 在研磨前进行等离子切割，可在先进封装中实现低轮廓和大尺寸模具的高可靠性模拟

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-11-18 DOI: 10.1186/s40486-023-00183-w

Keunhoi Kim, Jongcheol Park, Kyoungmin Kim, TaeHyun Kim, SooHyun Kwon, Yeeun Na

{"title":"Plasma dicing before grinding process for highly reliable singulation of low-profile and large die sizes in advanced packages","authors":"Keunhoi Kim, Jongcheol Park, Kyoungmin Kim, TaeHyun Kim, SooHyun Kwon, Yeeun Na","doi":"10.1186/s40486-023-00183-w","DOIUrl":"10.1186/s40486-023-00183-w","url":null,"abstract":"<div><p>The demand for advanced packaging is driven by the need for low-profile, densely-integrated, large-die Si devices in substrate-based or wafer-level packaging. Die strength is a critical parameter for ultrathin dies, making die singulation a vital aspect of advanced packaging technology. In this work, we present a dicing before grinding (DBG) process to compare and analyze die strengths using a mechanical blade, stealth laser, and plasma dicing. The three DBG processes were applied to a 200 mm silicon (Si) wafer process with a die size of 10 × 10 mm<sup>2</sup> and thicknesses of 100, 200, and 300 μm, respectively. Optical and electron microscopes were employed to investigate chipping quality, sidewall damage, and surface contamination. The bare Si die’s strength was assessed using a three-point bending test. Plasma dicing before grinding (PDBG) resulted in less contamination, chipping, and cracking compared to other DBG processes. Furthermore, PDBG exhibited the highest die strength of 1052 Pa.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00183-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138138519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fabrication and characterization of silicon-on-insulator wafers 绝缘体上硅晶圆的制备与表征

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-11-13 DOI: 10.1186/s40486-023-00181-y

Taeyeong Kim, Jungchul Lee

引用次数: 0

Rheological behavior of 10W40 base oil containing different combinations of MWCNT-Al2O3 nanoparticles and determination of the target nano-lubricant for industrial applications 含不同MWCNT-Al2O3纳米颗粒组合的10W40基础油流变行为及工业应用目标纳米润滑剂的测定

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-10-31 DOI: 10.1186/s40486-023-00179-6

Mohammad Hemmat Esfe, Soheyl Alidoust, Hossein Hatami, Davood Toghraie

{"title":"Rheological behavior of 10W40 base oil containing different combinations of MWCNT-Al2O3 nanoparticles and determination of the target nano-lubricant for industrial applications","authors":"Mohammad Hemmat Esfe, Soheyl Alidoust, Hossein Hatami, Davood Toghraie","doi":"10.1186/s40486-023-00179-6","DOIUrl":"10.1186/s40486-023-00179-6","url":null,"abstract":"<div><p>The main goal of this research is to compare the rheological behavior of hybrid nano lubricants (HNLs) with different composition ratios in a base oil. The purpose of the comparison is to determine the HNL with the best lubrication performance at the start of the vehicle. Theoretical methods have confirmed the non-Newtonian behavior in different laboratory conditions. HNLs with the composition ratio of 30:70 and 25:75 had the highest percentage of increase and decrease in viscosity, respectively 34.97% and − 1.85% at T = 55 °C, shear rate SR = 6665 s<sup>−1</sup> and solid volume fraction SVF = 1% and T = 5 °C, SR = 3999 s<sup>−1</sup> and SVF = 0.05%. To predict the viscosity of the desired HNL, in the RSM, a special model with an accuracy of R<sup>2</sup> = 0.9997 has been used. The margin of deviation (MOD) is determined in the range of − 3.43% < MOD < 4.75%. Viscosity sensitivity analysis shows that the greatest sensitivity will result from SVF changes at high SVFs. The experimental results of this study will introduce the optimal nano polishing to the craftsmen, and the theoretical part of this study will save the researchers from spending time and excessive economic costs.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00179-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0