Micro and Nano Systems Letters最新文献_第6页

Designing wearable capacitive pressure sensors with arrangement of porous pyramidal microstructures 多孔锥体结构可穿戴电容式压力传感器的设计

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-10-24 DOI: 10.1186/s40486-023-00178-7

Reza Javidi, Mahdi Moghimi Zand, Sara Alizadeh Majd

{"title":"Designing wearable capacitive pressure sensors with arrangement of porous pyramidal microstructures","authors":"Reza Javidi, Mahdi Moghimi Zand, Sara Alizadeh Majd","doi":"10.1186/s40486-023-00178-7","DOIUrl":"10.1186/s40486-023-00178-7","url":null,"abstract":"<div><p>Capacitive pressure sensors are essential for advanced applications like wearable medical devices, electronic skins, and biological signal detection systems. Enhancing sensitivity in these sensors is achieved by incorporating porous microstructures into the dielectric layer. The present research focuses on designing a capacitive pressure sensor comprising a porous micro-pyramidal dielectric layer featuring diagonally arranged pyramids. The effects of geometric parameters and material properties such as dielectric constant, porosity, base length, tip width, height, and the distance between the pyramidal microstructures were examined using the three-dimensional finite element simulations. A comparative analysis was conducted to evaluate the accuracy of the numerical solution. The simulation results were compared to experimental measurements, and the findings revealed a high level of agreement. The optimal quantity of data for this analysis was determined using the design of the experiment method, specifically the response surface model. The results show that arranging microstructures diagonally or laterally can impact sensitivity and initial capacitance. Specifically, employing a diagonal arrangement enhanced sensor sensitivity by up to 1.65 times while maintaining the initial capacitance relatively unaffected. Ultimately, this study derived mathematical equations from the collected data to estimate the initial capacitance and sensitivity of the sensor. The model predictions were compared to simulation results, and it was found that the models performed effectively.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00178-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134878413","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

Evaluation of stability and functionality of zinc oxide nanofluids for enhanced oil recovery 氧化锌纳米流体提高采收率的稳定性和功能评价

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-10-19 DOI: 10.1186/s40486-023-00180-z

Lengu Peter Tuok, Marwa Elkady, Abdelrahman Zkria, Tsuyoshi Yoshitake, Usama Nour Eldemerdash

{"title":"Evaluation of stability and functionality of zinc oxide nanofluids for enhanced oil recovery","authors":"Lengu Peter Tuok, Marwa Elkady, Abdelrahman Zkria, Tsuyoshi Yoshitake, Usama Nour Eldemerdash","doi":"10.1186/s40486-023-00180-z","DOIUrl":"10.1186/s40486-023-00180-z","url":null,"abstract":"<div><p>Nanofluids for enhanced oil recovery offer a breakthrough solution towards tertiary recovery and consequently higher oil production. Their ability to reduce interfacial tension, alteration of formation’s wettability, higher adsorption capacity, and acceleration of disjoining pressure makes them excellent candidates for enhanced oil recovery. The main objective of this paper is to investigate the effect of polymers on zinc oxide (ZnO) nanofluids for enhanced oil recovery (EOR) and the role played by chemical modification using polymer stabilizers on nanoparticle stability in nanofluids. Nanoparticles with an average particle size of 34 nm were synthesized and used to prepare nanofluids of different concentrations and their stability was evaluated using sedimentation and UV–vis spectrophotometry tests. ZnO-synthesized nanofluids were used solely and in addition to Polyvinylpyrrolidone (PVP) and Polyvinyl alcohol (PVA) as stabilizing agents. It was noted that ZnO nanofluids with PVA stabilizer recorded the highest oil recovery of 82%. In contrast, the ZnO nanofluids without stabilizing agents registered the lowest recovery rate during the flooding experiment. The results revealed that a higher injection rate increases the oil recovery and reduces the viscous fingering effect with a better displacement front. Furthermore, nanofluids containing polymeric stabilizing agents achieved better recovery factors compared to ZnO nanofluids without stabilizing agents. This phenomenon was also observed in the interfacial tension test where nanofluids with PVA and PVP stabilizers reduced the IFT by 59% and 61% respectively.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00180-z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134878377","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

Current status and further development of deterministic lateral displacement for micro-particle separation 微颗粒分离的确定性侧向位移研究现状及进一步发展

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-10-04 DOI: 10.1186/s40486-023-00175-w

Alexander Zhbanov, Ye Sung Lee, Sung Yang

{"title":"Current status and further development of deterministic lateral displacement for micro-particle separation","authors":"Alexander Zhbanov, Ye Sung Lee, Sung Yang","doi":"10.1186/s40486-023-00175-w","DOIUrl":"10.1186/s40486-023-00175-w","url":null,"abstract":"<div><p>Deterministic lateral displacement (DLD) is a passive, label-free, continuous-flow method for particle separation. Since its discovery in 2004, it has been widely used in medical tests to separate blood cells, bacteria, extracellular vesicles, DNA, and more. Despite the very simple idea of the DLD method, many details of its mechanism are not yet fully understood and studied. Known analytical equations for the critical diameter of separated particles include only the gap between the columns in the DLD array and the fraction of the column shift. The dependence of the critical diameter on the post diameter, channel height, and a number of other geometric parameters remains unexplored. The problems also include the effect of flow rate and particle concentration on the critical diameter and separation efficiency. At present, DLD devices are mainly developed through numerical simulation and experimental validation. However, it is necessary to find fundamental regularities that would help to improve the separation quantitatively and qualitatively. This review discusses the principle of particle separation, the physical aspects of flow formation, and hydrodynamic forces acting on particles in DLD microchannels. Various analytical models of a viscous flow in an array of cylindrical posts are described. Prospects for further research are outlined.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00175-w","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134878240","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

Non-fullerene acceptor based photoelectric material for retinal prosthesis 基于非富勒烯受体的视网膜假体光电材料

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-09-28 DOI: 10.1186/s40486-023-00177-8

Hyunsun Song, Hyeonhee Roh, Jae Young Kim, Byung Chul Lee, Bright Walker, Maesoon Im

{"title":"Non-fullerene acceptor based photoelectric material for retinal prosthesis","authors":"Hyunsun Song, Hyeonhee Roh, Jae Young Kim, Byung Chul Lee, Bright Walker, Maesoon Im","doi":"10.1186/s40486-023-00177-8","DOIUrl":"10.1186/s40486-023-00177-8","url":null,"abstract":"<div><p>Microelectronic retinal implants can restore a useful level of artificial vision in photoreceptor-damaged retina. Previously commercialized retinal prostheses require transocular connection lines to an external power supply and/or for data transmission, which are unwieldy and may cause unwanted side effects, such as infections. A recently reported wireless device used a rigid silicon substrate. However, it had the potential for a long-term mechanical mismatch with soft retinal tissue. In this work, we used organic photovoltaic materials which can be fabricated on flexible substrates as well as be operated without any physical connection to the external world. The present study employed PCE10 as an active layer for retinal prosthetic application for the first time. Compared to previously studied organic photovoltaic materials used in retinal prosthesis research (such as P3HT), our PCE10 devices showed higher efficiency, providing a huge advantage in this field. When the PCE10 was blended with other non-fullerene acceptors achieving a ternary organic photovoltaic layer (PCE10:ITIC:Y6 blend), it showed lower reduction of photocurrent under same irradiation frequency condition. The fabrication method for our organic photovoltaic device was simple and easy to control its thickness. The fabricated devices showed adequate photocurrent to stimulate the retinal neurons with a smaller reduction in generated photocurrent during repeating stimuli compared to P3HT or PCE10 alone.Author names: Please confirm if the author names are presented accurately and in the correct sequence (given name, middle name/initial, family name). Author: Given name [Jae Young] Last name [Kim]. Author: Given name [Byung Chul] Last name [Lee].Yes, they are correct.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00177-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797495","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

Investigation of LIG-based pressure sensors with various silicon-based elastomeric encapsulation layers 不同硅基弹性体封装层的硅基压力传感器研究

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-09-27 DOI: 10.1186/s40486-023-00176-9

Yoo-Kyum Shin, Ki-Hoon Kim, Min-Ho Seo

{"title":"Investigation of LIG-based pressure sensors with various silicon-based elastomeric encapsulation layers","authors":"Yoo-Kyum Shin, Ki-Hoon Kim, Min-Ho Seo","doi":"10.1186/s40486-023-00176-9","DOIUrl":"10.1186/s40486-023-00176-9","url":null,"abstract":"<div><p>Laser-induced graphene (LIG) has attracted significant interest in the field of pressure sensors owing to the high sensitivity associated with its inherent three-dimensional porous structure. However, the brittleness of fabricated LIG poses a critical challenge in terms of durability. To address this issue, current research on LIG-based pressure sensors has focused on the utilization of Si-elastomer encapsulation layers. Despite the importance of the mechanical properties of Si elastomers for the performance of physical sensors, few studies have been conducted on the characterization of pressure sensors based on the encapsulation layer. In this study, we investigated the electromechanical characteristics of LIG-based pressure sensors encapsulated in various Si-based elastomers. For an unbiased evaluation, we first introduce a simple and reliable fabrication process for LIG-based pressure sensors with different Si-elastomer encapsulation layers. Subsequently, the electromechanical responses of the sensors were characterized using an automated pressure machine, demonstrating that sensors with encapsulation layers with a lower Young’s modulus exhibited increased resistance changes and extended response times. Finally, an in-depth exploration of the environmental stability of the pressure sensors was conducted for various encapsulation materials, ultimately confirming negligible performance variations based on the encapsulation materials.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00176-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797784","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

Overcoming delamination in two-photon lithography for improving fabrication of 3D microstructures 克服双光子光刻中分层现象，改善三维微结构的制造

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-09-22 DOI: 10.1186/s40486-023-00173-y

Cheol Woo Ha

{"title":"Overcoming delamination in two-photon lithography for improving fabrication of 3D microstructures","authors":"Cheol Woo Ha","doi":"10.1186/s40486-023-00173-y","DOIUrl":"10.1186/s40486-023-00173-y","url":null,"abstract":"<div><p>Two-photon lithography has emerged as a highly effective method for fabricating intricate three-dimensional (3D) microstructures. It enables the rapid fabrication of 3D microstructures, unlike conventional two-dimensional nanopatterning. Researchers have extensively investigated two-photon polymerization (TPP) for the fabrication of diverse 3D micro/nanodevices with high resolution. TPP can be applied in cell cultures, metamaterials, optical materials, electrical devices, and fluidic devices, to name a few. In this study, we investigate the applications and innovative research pertaining to TPP, which is an effective fabrication technique with significant advancement in various fields. In particular, we attempt to determine the reasons that cause the detachment or delamination of 3D microstructures during the development process and propose some solutions. A step-by-step fabrication process for a glass substrate, from photoresist deposition to laser scanning and the dissolution of the uncured photoresist, is presented. Defects such as pattern delamination are discussed, with emphasis on the cell scaffold structure and microlens array. Understanding and addressing these defects are vital to the success of 3D microstructure fabrication via TPP.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00173-y","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134797425","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

Sweat-permeable electronic skin with a pattern of eyes for body temperature monitoring 带有眼睛图案的防汗电子皮肤，用于体温监测

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-09-15 DOI: 10.1186/s40486-023-00170-1

Jeong Hyeon Kim, Daniel J. Joe, Han Eol Lee

{"title":"Sweat-permeable electronic skin with a pattern of eyes for body temperature monitoring","authors":"Jeong Hyeon Kim, Daniel J. Joe, Han Eol Lee","doi":"10.1186/s40486-023-00170-1","DOIUrl":"10.1186/s40486-023-00170-1","url":null,"abstract":"<div><p>Human-machine interface has been considered as a prominent technology for numerous smart applications due to their direct communication between humans and machines. In particular, wearable electronic skins with a free form factor have received a lot of attention due to their excellent adherence to rough and wrinkled surfaces such as human skin and internal organs. However, most of the e-skins reported to date have some disadvantages in terms of mechanical instability and accumulation of by-products at the interface between the human skin and the device. Here, we report a mechanically stable e-skin via a newly designed pattern named the “eyes.” The ingeniously designed pattern of the eyes allowed mechanical stress and strain to be dissipated more effectively than other previously reported patterns. E-skin permeability of by-product was experimentally confirmed through sweat removal tests, showing superior sweat permeability compared to conventional e-skins. Finally, the real-time monitoring of the body temperature was carried out using our resistive-type thermometer in the e-skin.</p></div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00170-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796320","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 evaluation of a flexible temperature sensor array using multi-layer ceramic capacitors for spatial temperature mapping 利用多层陶瓷电容器进行空间温度映射的柔性温度传感器阵列的制造与评价

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-09-13 DOI: 10.1186/s40486-023-00172-z

Ji-Sung Yoon, Kwang-Seok Yun

引用次数: 0

Improved recovery of NO2 sensors using heterojunctions between transition metal dichalcogenides and ZnO nanoparticles 利用过渡金属二硫化物和ZnO纳米颗粒之间的异质结提高NO2传感器的回收率

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-09-11 DOI: 10.1186/s40486-023-00171-0

Leilei Wang, Jungwook Choi

引用次数: 0

Hydrophobic surface for direct PEGDA micro-pattern fabrication 用于直接PEGDA微图案制作的疏水表面

IF 3.6

Micro and Nano Systems Letters Pub Date : 2023-06-07 DOI: 10.1186/s40486-023-00169-8

Anna Danielak, Juhee Ko, Aminul Islam, David Bue Pedersen, Jungchul Lee

{"title":"Hydrophobic surface for direct PEGDA micro-pattern fabrication","authors":"Anna Danielak, Juhee Ko, Aminul Islam, David Bue Pedersen, Jungchul Lee","doi":"10.1186/s40486-023-00169-8","DOIUrl":"10.1186/s40486-023-00169-8","url":null,"abstract":"<div><p>Photopolymerization of hydrogels films has gained interest in many biomedical and industrial fields. Hydrogel micro-patterns fabricated directly on a device are used as filtering barriers, however, due to weak mechanical properties, these parts require a stable support but deposition of hydrogel in non-polymerized state brings a risk of sinking inside the structure. These limitations can be overcome by applying a hydrophobic surface. This paper presents a novel two-step method, in which a hydrophobic surface was designed and manufactured using mask-projection vat photopolymerization additive manufacturing (VPP). Afterwards, PEGDA-based hydrogel photopolymers were deposited on the surface and a micro-scale patterns were cured. The parts were subjected to water immersion and heating in order to evaluate the swelling and shrinking behaviour of hydrogel. The parts remained stable on the substrate and maintained the properties and the results revealed the shape retention over 97%. This work shows that VPP can be applied in the manufacturing of hydrophobic surfaces for hydrogel photopolymer deposition and curing without sacrificing critical properties.</p><h3>Graphical Abstract</h3>\u0000 <figure><div><div><div><picture><source><img></source></picture></div></div></div></figure>\u0000 </div>","PeriodicalId":704,"journal":{"name":"Micro and Nano Systems Letters","volume":"11 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://mnsl-journal.springeropen.com/counter/pdf/10.1186/s40486-023-00169-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4305878","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