Kính mời Quý Thầy/Cô cùng các em học viên, sinh viên quan tâm đến Kỹ thuật sản xuất, Chế tạo máy, và Nghiên cứu khoa học đến tham dự Seminar Khoa Công nghệ Cơ khí lần 2 – 2025.

Thời gian tổ chức: 14:00 ngày 26/06/2025 (Thứ 5)

Địa điểm tổ chức: Trực tuyến trên ứng dụng Zoom Meeting

Link tham gia: https://zoom.us/j/97869803203?pwd=1Mrlu9uowaPak7BIkXan535aSOuwRt.1

Meeting ID: 978 6980 3203

Passcode: IUH123

Link đăng ký:
https://docs.google.com/forms/d/e/1FAIpQLSc-KS5mfq1sQQrPWc-Nbhfo5-v3929ClJLbFH0a3wBLbxeZvw/viewform?usp=sf_link

Báo cáo viên:

– GS. TS. Lee Bong-Kee – Chonnam National University
– GS. TS. Nguyen Van Toan – Graduate School of Engineering, Tohoku University, Japan
– GS. TS. Wang Dung-An – National Chung Hsing University, Taichung, Taiwan
– GS. TS. Seung-Bok Choi – The State University of New York, Korea (SUNY Korea)

Kính mời Quý Thầy/Cô cùng các em học viên, sinh viên quan tâm đến tham dự.

Electrospun nanofiber membranes for real-time pH monitoring toward intelligent food packaging

Prof. Dr. Bong-Kee Lee
Chonnam National University

This study presents a smart, biodegradable electrospun nanofiber membrane composed of polyvinyl alcohol (PVA), chitosan, and red cabbage-derived anthocyanins for real-time pH monitoring in intelligent food packaging. The incorporated anthocyanins enable clear, reversible color transitions from red (acidic) to green (alkaline), visually indicating pH changes associated with food spoilage. Chitosan enhances the membrane’s structural integrity and imparts antibacterial properties, broadening its applicability. Electrospinning facilitated the fabrication of a biocompatible nanofiber matrix with embedded pH-responsive indicators. The membrane demonstrated consistent colorimetric responses across a pH range of 1–12, with minimal color degradation (ΔE = 0.55 ± 0.01) at 4 °C over 7 days. Real-time testing with meat and strawberries showed color shifts correlating with pH elevation due to spoilage-related TVBN generation. These results highlight the membrane’s potential as a sustainable and effective solution for intelligent food packaging and freshness monitoring

Nanoengineered Microsystem: Concepts and Demonstrations

Prof. Dr. Nguyen Van Toan

Graduate School of Engineering, Tohoku University, Japan
Email: nguyen.van.toan.c6@tohoku.ac.jp

This work explores the principles and applications of nanoengineered microsystems, a rapidly advancing field poised to revolutionize technologies in energy, environment, and healthcare. By leveraging the unique properties that emerge at the nanoscale, nanoengineering offers transformative potential across multiple domains. This study presents four core research themes that collectively demonstrate how miniaturization and surface engineering can drive innovation in microsystems.

Nanoscale Mechanics: Downscaling mechanical systems enhances their performance by enabling faster response times, higher efficiency, and reduced power consumption. Such improvements are critical for the development of high-speed, low-energy microdevices.

Nanoscale Fluidic Transport: When fluid channels are miniaturized to the nanoscale, ionic transport can be induced even under small temperature gradients. This phenomenon opens new possibilities for next-generation thermoelectric generators based on ionic conduction in nanochannels.

Nanoscale Thermal Management: Increasing the surface area at the nanoscale significantly improves heat dissipation, which is essential for optimizing the performance of thermoelectric generators. Additionally, embedding nanoparticles into host materials allows precise control of thermal conductivity, enabling the development of high-performance micro-TEGs.

Nanoscale Chemistry: Nanoscale materials offer large surface-to-volume ratios, enhancing chemical reactivity and accelerating reaction rates. These characteristics are particularly advantageous for improving the efficiency of micro-scale energy storage systems.

Together, these research directions aim to unlock the full potential of nanoengineering, paving the way for innovative micro/nano systems that will shape the future of smart, sustainable technologies.

Vibration Energy Harvesting

Prof. Dr. Dung-An Wang
National Chung Hsing University, Taichung, Taiwan

Performing R&D on compliant mechanism design, novel ultrasonic horn design, steel leveling, micromachined energy harvesters and CMOS MEMS sensors and actuators.

Energy Harvesting captures energy from ambient sources such as solar power, thermal gradients, vibrations, and radiofrequency signals. Energy harvesting cab support sustainable and self-powered electronic systems, reducing dependence on traditional batteries and contributing to the development of green technologies.

This talk focuses on vibration energy harvesting. The discussion covers various vibration energy harvesting technologies, their applications, and the challenges involved in making them efficient and practical.

Vibration Control Using Smart Materials: Lifetime Works

Prof. Dr. Seung-Bok Choi
The State University of New York, Korea (SUNY Korea)

In this talk, my lifetime achievement on the research about magnetorheological fluid (MRF) is presented by emphasizing vibration control of several dynamic systems subjected to external excitations during operation. As representative examples, three different vibration control systems are presented and briefly discussed: semi-active and active vehicle suspension system using MR dampers, semi-active mount systems for vibration control of wheel loader cabins and semi-active shock mitigation of aircraft landing gear system using ME dampers instead of conventional oleo struct. As a concluding remark from a gerontologist, several future works for successful commercial products utilizing MRFs are suggested. Finally, my lifetime research achievement is summarized to say that my whole life is happy during the research like playing my hobby.