NANO KOREA 2018

A special issue of Micromachines (ISSN 2072-666X).

Deadline for manuscript submissions: closed (3 August 2018) | Viewed by 28909

Special Issue Editors

Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
Interests: synthesis of 2D atomic crystals and their device applications; synthesis of metal oxides and their device physics; electrohydrodynamic lithography; atomic layer deposition
Special Issues, Collections and Topics in MDPI journals
Ulsan National Institute of Science and Technology (UNIST)
Interests: solar cells; thermoelectric; thin films; 1-dimensional nanostructures
School of Integrative Engineering, Chung-Ang University, Seoul 06974, Republic of Korea
Interests: atomic force microscopy; electrical/electrochemical nanobiosensors; optical nanobiosensors; biochips; BioMEMS and BioNEMS; nanobiomaterials for environments; nanotechnology for bio-robotics; nanotechnology for tissue engineering and regenerative medicine; nanomaterials and nanotechnology in drug and gene delivery; nano-toxicology; sample preparation; molecular diagnostic system; bioanalytical engineering
Special Issues, Collections and Topics in MDPI journals
Department of Chemistry, Sungkyunkwan University, Suwon 440-746, Korea
Interests: nanobiosensor; nano-analysis; nanomaterials; nanomanufacturing
Special Issues, Collections and Topics in MDPI journals
Department of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Korea
Interests: nanomagnetic materials; spin caloritronics; plasmonic nanostructures; magnetoplasmonics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will publish selected papers from the 16th International Nanotech Symposium & Nano-Convergence Exhibition (NANO KOREA 2018), 11–13 July, 2018, Goyang, Korea.
In particular, the symposium, the largest sympoisum on nanoscale science and technology in Korea, will be a meaningful occasion to confirm major research results and up-to-date research trends, increase the exchange among researchers in relevant fields, and materialize the results of research.
The NANO KOREA symposium will cover the following main topics:

  1. Nanoelectronics and photonics
  2. Advanced Nanomaterials
  3. Nanofabrication and Measurement
  4. Nanobiotechnology and Nanomedicine
  5. Nanotechnology for Energy
  6. Safety, Standardization and Regulation in Nanotechlogy
  7. Sensors and Actuators
  8. Computational Nano Science and Technology

Papers attracting the most interest at the conference, or that provide novel contributions, will be selected for publication in Micromachines. These papers will be peer-reviewed for validation of research results, developments and applications.

Prof. Dr. Dae Joon Kang
Prof. Dr. Kyoung Jin Choi
Prof. Dr. Junhong Min
Prof. Dr. Wan Soo Yun
Prof. Dr. Jong-Ryul Jeong
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Micromachines is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Micro/Nanofabrication 
  • Nanoelectronics 
  • Bionanotechnology 
  • Nanomaterials 
  • Computational Materials Design

Published Papers (8 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

11 pages, 2967 KiB  
Article
A Study on An EMG Sensor with High Gain and Low Noise for Measuring Human Muscular Movement Patterns for Smart Healthcare
by Sun-Woo Yuk, In-Ho Hwang, Hyeon-Rae Cho and Sang-Geon Park
Micromachines 2018, 9(11), 555; https://doi.org/10.3390/mi9110555 - 29 Oct 2018
Cited by 3 | Viewed by 2131
Abstract
The form of the collection of bio-signals is becoming increasingly integrated and smart to meet the demands of the age of smart healthcare and the Fourth Industrial Revolution. In addition, the movement patterns of human muscles are also becoming more complex due to [...] Read more.
The form of the collection of bio-signals is becoming increasingly integrated and smart to meet the demands of the age of smart healthcare and the Fourth Industrial Revolution. In addition, the movement patterns of human muscles are also becoming more complex due to diversification of the human living environment. An analysis of the movement patterns of normal people’s muscles contracting with age and that of patients who are being treated in a hospital, including the disabled, will help improve life patterns, medical treatment patterns, and quality of life. In this study, the researchers developed a smart electromyogram (EMG) sensor which can improve human life patterns through EMG range and pattern recognition, which is beyond the conventional simple EMG measurement level. The developed sensor has a high gain of 10,000 times or more, noise of 500 uVrms or less, and common mode rejection ratio (CMRR) of 100 dB or more for EMG level and pattern recognition. The pattern recognition time of the sensor is 30 s. All the circuits developed in this study have a phase margin of 75 degrees or more for stability. Standard 0.25 μm complementary metal oxide semiconductor (CMOS) technology was used for the integrated circuit design. The system error rate was confirmed to be 1% or less through a clinical trial conducted on five males in their 40s and three females in their 30s for the past two years. The muscle activities of all subjects of the clinical trial were improved by about 21% by changing their life patterns based on EMG pattern recognition. Full article
(This article belongs to the Special Issue NANO KOREA 2018)
Show Figures

Figure A1

10 pages, 3391 KiB  
Article
A Plasmonic Fiber Based Glucometer and Its Temperature Dependence
by Jisoo Kim, Changjin Son, Sunjak Choi, Won Jung Yoon and Heongkyu Ju
Micromachines 2018, 9(10), 506; https://doi.org/10.3390/mi9100506 - 05 Oct 2018
Cited by 12 | Viewed by 2429
Abstract
We present the plasmonic fiber based optical glucometer. A thin gold layer is coated on clad-free core of multimode optical fiber along 3 cm length to excite surface plasmons at 632.8 nm wavelength. Glucose oxidase is immobilized on the metal surface for glucose [...] Read more.
We present the plasmonic fiber based optical glucometer. A thin gold layer is coated on clad-free core of multimode optical fiber along 3 cm length to excite surface plasmons at 632.8 nm wavelength. Glucose oxidase is immobilized on the metal surface for glucose sensing. The effective surface refractive index increases by gluconic acid and hydrogen peroxide that are generated upon glucose injection, leading to plasmonic condition change with a consequence of optical power change at the fiber output. We obtain limit of detection of glucose concentration of 6.75 mg/dL, indicating higher sensitivity than the wavelength interrogating SPR glucometer that uses a spectrometer of 1nm spectral resolution. The coefficient of variation is 8.6% at a glucose concentration of 80 mg/dL at room temperature. We also examine the effects of ambient temperature variations from −10 °C to 40 °C on the performance of the presented sensor and compared them with those on commercially available glucometers that are based on enzyme electrodes. We find that the presented fiber sensor produced standard deviation of 12.1 mg/dL at a glucose concentration of 80 mg/dL under such varying temperature, which is, even without additional temperature correction function, comparable to the commercialized ones. Full article
(This article belongs to the Special Issue NANO KOREA 2018)
Show Figures

Figure 1

12 pages, 3731 KiB  
Article
Unexpected Phase Behavior of Pluronic Polymer-Organic Derivative Mixtures Depending on Temperature in Aqueous Solution
by Jong-Dae Jang, Eunhye Kim, Min-Jae Lee, Young-Soo Han, Joona Bang and Tae-Hwan Kim
Micromachines 2018, 9(10), 505; https://doi.org/10.3390/mi9100505 - 05 Oct 2018
Cited by 3 | Viewed by 2642
Abstract
The phase behavior of amphiphilic Pluronic block copolymers in aqueous solution is of importance for a broad spectrum of practical applications but has not been fully exploited yet. Here, the phase behavior of the mixture of the Pluronic P65 and P105 triblock copolymer, [...] Read more.
The phase behavior of amphiphilic Pluronic block copolymers in aqueous solution is of importance for a broad spectrum of practical applications but has not been fully exploited yet. Here, the phase behavior of the mixture of the Pluronic P65 and P105 triblock copolymer, (which have the same composition of PEO and PPO but the different molecular weight) and organic derivative, 5-methyl salicylic acid (5mS), in aqueous solution has been investigated by using small angle neutron scattering (SANS). According to the temperature and the 5mS concentration, SANS measurements showed that the P65-5mS mixtures sequentially transform into a random coil, sphere, vesicle, cylinder, and vesicle again, while the P105-5mS mixtures form spherical particles with two different sizes without any topological phase transition. Upon heating, the formation of two different kinds of the vesicle structure of amphiphilic block copolymer in aqueous solution is very unusual. This phase behavior was explained as the coupled effect of the simultaneous increase of the hydrophobicity of the polymer and the solubility of 5mS molecules upon heating. This result gives fundamental information for the practical use of Pluronic polymers in nano- and bio-science and it provides a simple route for the fabrication of the nanostructure without a complicated procedure. Full article
(This article belongs to the Special Issue NANO KOREA 2018)
Show Figures

Figure 1

11 pages, 3116 KiB  
Article
Enhancement of Virus Infection Using Dynamic Cell Culture in a Microchannel
by Jeong A Kim, Hye Jin Choi, Chul Min Kim, Hee Kyung Jin, Jae-sung Bae and Gyu Man Kim
Micromachines 2018, 9(10), 482; https://doi.org/10.3390/mi9100482 - 21 Sep 2018
Cited by 4 | Viewed by 3229
Abstract
With increasing interest in induced pluripotent stem cells (iPSCs) in the field of stem cell research, highly efficient infection of somatic cells with virus factors is gaining importance. This paper presents a method of employing microfluidic devices for dynamic cell culture and virus [...] Read more.
With increasing interest in induced pluripotent stem cells (iPSCs) in the field of stem cell research, highly efficient infection of somatic cells with virus factors is gaining importance. This paper presents a method of employing microfluidic devices for dynamic cell culture and virus infection in a microchannel. The closed space in the microchannel provided a better environment for viruses to diffuse and contact cell surfaces to infect cells. The microfluidic devices were fabricated by photolithography and soft lithography. NIH/3T3 fibroblast cells were cultured in the microfluidic device in static and dynamic conditions and compared with the conventional culture method of using Petri dishes. Virus infection was evaluated using an enhanced green fluorescent protein virus as a model. Dynamic culture in the microchannel showed similar growth of cells to that in Petri dish culture, but the virus infection efficiency was four-times higher. The proposed dynamic culture system could be useful in iPSC research by providing efficient virus infection tools. Full article
(This article belongs to the Special Issue NANO KOREA 2018)
Show Figures

Figure 1

9 pages, 2294 KiB  
Article
Liquid Cladding Mediated Optical Fiber Sensors for Copper Ion Detection
by Vien Thi Tran, Nhu Hoa Thi Tran, Than Thi Nguyen, Won Jung Yoon and Heongkyu Ju
Micromachines 2018, 9(9), 471; https://doi.org/10.3390/mi9090471 - 17 Sep 2018
Cited by 15 | Viewed by 4058
Abstract
We present a label-free optical fiber based sensor device to detect copper ions (Cu2+) in water. A multimode optical fiber, with its polymer cladding removed along a 1-cm length, is used for the optical sensor head, where the injected Cu2+ [...] Read more.
We present a label-free optical fiber based sensor device to detect copper ions (Cu2+) in water. A multimode optical fiber, with its polymer cladding removed along a 1-cm length, is used for the optical sensor head, where the injected Cu2+ in the liquid phase acts as a liquid cladding for the optical mode. The various Cu2+ concentrations modulate the numerical aperture (NA) of the liquid cladding waveguide part. The degree of NA mismatch between the liquid cladding and solid cladding guided parts gives rise to an optical power transmittance change, forming the sensing principle. The presented liquid cladding fiber sensor exhibits a minimum resolvable refractive index of 2.48 × 10−6. For Cu2+ detection, we functionalize the sensor head surface (fiber core) using chitosan conjugated ethylenediaminetetraacetic acid (EDTA) which captures Cu2+ effectively due to the enhanced chelating effects. We obtain a limit of detection of Cu2+ of 1.62 nM (104 ppt), which is significantly lower than the tolerable level in drinking water (~30 µM), and achieve a dynamic range of 1 mM. The simple structure of the sensor head and the sensing system ensures the potential capability of being miniaturized. This may allow for in-situ, highly-sensitive, heavy metal sensors in a compact format. Full article
(This article belongs to the Special Issue NANO KOREA 2018)
Show Figures

Figure 1

9 pages, 2110 KiB  
Article
Fluorescence Enhancement Using Bimetal Surface Plasmon-Coupled Emission from 5-Carboxyfluorescein (FAM)
by Nhu Hoa Thi Tran, Kieu The Loan Trinh, Jun-Ho Lee, Won Jung Yoon and Heongkyu Ju
Micromachines 2018, 9(9), 460; https://doi.org/10.3390/mi9090460 - 12 Sep 2018
Cited by 10 | Viewed by 4182
Abstract
We demonstrate the enhancement of fluorescence emission from a dye, 5-carboxyfluorescein (FAM), which couples with surface plasmons at the spectral channels of excitation and emission. Experiments and calculations revealed that bimetallic (gold-silver) plasmon, as compared to the monometallic ones, allowed such coupling to [...] Read more.
We demonstrate the enhancement of fluorescence emission from a dye, 5-carboxyfluorescein (FAM), which couples with surface plasmons at the spectral channels of excitation and emission. Experiments and calculations revealed that bimetallic (gold-silver) plasmon, as compared to the monometallic ones, allowed such coupling to be enhanced, at both the spectral channels. We achieved the maximum fluorescence enhancement level of 46.5-fold, with markedly high reproducibility (coefficient of variation ~ 0.5%) at a FAM concentration of 10 nM. We also found that higher fluorescence enhancement was more likely to be reproducible. This encourages the use of this technology for practical applications in fluorescence-based biochemical assays. Moreover, we investigated a FAM concentration-dependent enhancement of fluorescence. It was found that fluorescence enhancement decreased and saturated at above 10 nM concentration possibly due to partial photo-bleaching of FAM molecules. Full article
(This article belongs to the Special Issue NANO KOREA 2018)
Show Figures

Figure 1

8 pages, 5436 KiB  
Article
Thermal-Flow Characteristics of Ferrofluids in a Rotating Eccentric Cylinder under External Magnetic Force
by Jae-Hee Kim, Hyeon-Seok Seo and Youn-Jea Kim
Micromachines 2018, 9(9), 457; https://doi.org/10.3390/mi9090457 - 12 Sep 2018
Cited by 4 | Viewed by 3165
Abstract
Heat dissipation has become an important issue due to the miniaturization of various electronic devices. Various methods such as spray and nozzle coolers, heat sinks and so on are used for heat dissipation. However, the emergence of ferrofluids drastically improves the operating characteristics [...] Read more.
Heat dissipation has become an important issue due to the miniaturization of various electronic devices. Various methods such as spray and nozzle coolers, heat sinks and so on are used for heat dissipation. However, the emergence of ferrofluids drastically improves the operating characteristics of electromagnetic systems and devices. A ferrofluid is a suspension containing 10-nm magnetic particles in a colloidal solution. This material exhibits paramagnetic behavior and is sensitive to magnetic field and temperature. In this study, heat transfer characteristics of ferrofluids in a rotating eccentric cylinder were investigated using the commercial code, COMSOL Multiphysics. Numerical results of the local Nusselt number, magnetophoretic force and velocity distributions were obtained from various eccentricities of the cylinder, and the results were graphically depicted with various flow conditions. Full article
(This article belongs to the Special Issue NANO KOREA 2018)
Show Figures

Figure 1

11 pages, 2878 KiB  
Article
High-Performance Resistive Pressure Sensor Based on Elastic Composite Hydrogel of Silver Nanowires and Poly(ethylene glycol)
by Youngsang Ko, Dabum Kim, Goomin Kwon and Jungmok You
Micromachines 2018, 9(9), 438; https://doi.org/10.3390/mi9090438 - 30 Aug 2018
Cited by 13 | Viewed by 6413
Abstract
Improved pressure sensing is of great interest to enable the next-generation of bioelectronics systems. This paper describes the development of a transparent, flexible, highly sensitive pressure sensor, having a composite sandwich structure of elastic silver nanowires (AgNWs) and poly(ethylene glycol) (PEG). A simple [...] Read more.
Improved pressure sensing is of great interest to enable the next-generation of bioelectronics systems. This paper describes the development of a transparent, flexible, highly sensitive pressure sensor, having a composite sandwich structure of elastic silver nanowires (AgNWs) and poly(ethylene glycol) (PEG). A simple PEG photolithography was employed to construct elastic AgNW-PEG composite patterns on flexible polyethylene terephthalate (PET) film. A porous PEG hydrogel structure enabled the use of conductive AgNW patterns while maintaining the elasticity of the composite material, features that are both essential for high-performance pressure sensing. The transparency and electrical properties of AgNW-PEG composite could be precisely controlled by varying the AgNW concentration. An elastic AgNW-PEG composite hydrogel with 0.6 wt % AgNW concentration exhibited high transmittance including T550nm of around 86%, low sheet resistance of 22.69 Ω·sq−1, and excellent bending durability (only 5.8% resistance increase under bending to 10 mm radius). A flexible resistive pressure sensor based on our highly transparent AgNW-PEG composite showed stable and reproducible response, high sensitivity (69.7 kPa−1), low sensing threshold (~2 kPa), and fast response time (20–40 ms), demonstrating the effectiveness of the AgNW-PEG composite material as an elastic conductor. Full article
(This article belongs to the Special Issue NANO KOREA 2018)
Show Figures

Figure 1

Back to TopTop