Article
Chemistry, Physical
Wu Yujing, Zhou Hongxiu, Zhang Ao, Zhao Leqing
Summary: The research shows that flowing electrode direct methanol fuel cell (FEDMFC) effectively reduces methanol crossover rate while maintaining high power densities. Increasing flow rate can decrease crossover rate but will affect efficiency and stability, with optimal flow rate controlled at 1-3 sccm.
JOURNAL OF POWER SOURCES
(2022)
Article
Energy & Fuels
S. A. Gokulakrishnan, Vikas Kumar, G. Arthanareeswaran, A. F. Ismail, Juhana Jaafar
Summary: By adding halloysite nanoclay and f-GO to SPEEK membrane, the thermal stability, proton conductivity, and hydrophilicity can be improved, making it an excellent membrane material for direct methanol fuel cell applications.
Article
Polymer Science
Kumar Divya, Dipak Rana, Laila Rameesha, Meenakshi Sundram Sri Abirami Saraswathi, Alagumalai Nagendran
Summary: Custom-made nanocomposite proton exchange membranes using sulfonated chitosan and sulfonated graphene oxide exhibited superior proton conductivity and selectivity for direct methanol fuel cells. The enhanced hydrophilicity and ion exchange capacity of the membranes contributed to the improved performance.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Electrochemistry
Mohamed E. Abdelrahman, Hanguang Zhang, Gang Wu, Xianglin Li, Shawn Litster
Summary: In this study, a platinum group metal-free Fe-N-C catalyst derived from metal organic framework precursors was evaluated for the cathode side of a direct methanol fuel cell. The catalyst exhibited high performance under liquid methanol and air operation, with the cathode contributing significantly to the voltage loss. Improvements in catalyst layer fabrication were identified through nanoscale X-ray computed tomography.
ELECTROCHIMICA ACTA
(2022)
Article
Polymer Science
Kosar Arab, Mahdi Tohidian, Amirsaeed Shamsabadi
Summary: In this study, nanocomposite polyelectrolyte membranes based on sulfonated polystyrene (SPS) and imidazole-2-acetic acid (Im) blend (SPSIm), incorporated with halloysite nanotubes (HNTs), were investigated for direct methanol fuel cell (DMFC) applications. The optimal degree of sulfonation for PS was selected based on hydrolytic stability, and SPS was blended with Im to improve proton conductivity and decrease methanol permeability. The addition of HNTs further reduced methanol crossover by introducing tortuous diffusion pathways. The resulting SPSIm/HNT membrane showed significantly decreased methanol permeability and improved membrane selectivity parameter, making it a potential candidate for DMFC applications.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Li Liang, Zuo Zicheng, He Feng, Jiang Zhongqing, Li Yuliang
Summary: An ultrathin layer of nitrogen-rich GDY film is prepared to retard methanol permeation in direct methanol fuel cells, significantly increasing selective suppression of methanol transfer and improving power performance and long-term stability of the cell.
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
(2021)
Article
Green & Sustainable Science & Technology
Sandip Pal, Rakhi Mondal, Uma Chatterjee
Summary: Blending copolymers of PMMA-co-PAMPS with PVDF and S-PVDF in different weight ratios resulted in proton exchange membranes with high proton conductivity and low methanol permeability, showing promise for application in fuel cells. The blend membranes exhibited improved performance compared to Nafion (R) 117 membrane, making them a potential candidate for PEMFCs or DMFCs application.
Article
Polymer Science
Rabiranjan Murmu, Debashis Roy, Sarat Chandra Patra, Harekrushna Sutar, Pragyan Senapati
Summary: By filling the polymer membrane with silica, it is possible to increase the proton conductivity at medium to higher temperatures, reduce methanol permeability, and increase membrane selectivity, which is beneficial for the design of direct methanol fuel cells.
Article
Polymer Science
Rabiranjan Murmu, Debashis Roy, Harekrushna Sutar, Pragyan Senapati, Swetak Abhisek Mohapatra
Summary: In this study, the cross-linking reaction improved the properties of Chitosan-PVA blend, enhancing the ion exchange capacity and thermal stability, reducing the glass transition temperature, and decreasing methanol crossover, resulting in higher proton conductivity.
JOURNAL OF POLYMER MATERIALS
(2022)
Review
Polymer Science
Gowthami Palanisamy, Tae Hwan Oh, Sadhasivam Thangarasu
Summary: A direct methanol fuel cell (DMFC) is an excellent energy device that converts methanol to energy with high efficiency. Commercial membranes for DMFCs are expensive and have high methanol permeability, but novel developments using cost-effective cellulose-based materials have improved performance. In this review, the advances and utilization of different cellulose materials as proton-exchange membranes (PEMs) for DMFCs are discussed, including cellulose derivatives and composites with inorganic additives.
Article
Electrochemistry
Amirsalar Bagherzadeh, Mahdi Tohidian, Yeganeh Mollamohammadi Sadafi, Amirsaeed Shamsabadi, Hesam Makki
Summary: Polyelectrolyte membranes (PEMs) containing chitosan and Nafion were prepared for DMFC application. The addition of Nafion increased the Tg and decreased the crystallinity of the chitosan matrix due to the interaction between -SO3H groups in Nafion and -NH2 groups in chitosan. The PEMs with higher Nafion loading weight exhibited higher proton conductivity and methanol permeability, and the membrane with 25 wt% Nafion showed comparable selectivity parameter to neat Nafion. A maximum power density of 39 mW cm(-2) was achieved for this membrane in DMFC performance test.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Guoxiao Xu, Zhiguang Wu, Ziyi Xie, Zenglv Wei, Jing Li, Konggang Qu, Ying Li, Weiwei Cai
Summary: By incorporating GO and GQD into HBM, this study successfully enhanced the proton/methanol selectivity and improved the performance of DMFC. Compared to pristine HBM, the proton conductivity of GQD-HBM membrane increased by 17% while methanol permeability decreased by approximately 50%, leading to an increase in proton/methanol selectivity by over 80%.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Hazlina Junoh, Juhana Jaafar, Nik Abdul Hadi M. Nordin, Ahmad F. Ismail, Mohd H. D. Othman, Mukhlis A. Rahman, Farhana Aziz, Norhaniza Yusof, Syarifah Noor S. Sayed Daud
Summary: Porous poly ether sulfone (PES) membranes were prepared using two different solvents via dry/wet non-solvent phase inversion techniques, with membranes prepared using DMAc at 3 minutes solvent evaporation time showing desirable properties for proton conduction and methanol resistance.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Zhen-Hua Li, Hui Zeng, Guang Zeng, Chunyu Ru, Guanghua Li, Wenfu Yan, Zhan Shi, Shouhua Feng
Summary: A multivariate flexibility synergistic strategy was designed to achieve Flexible MOFs with high conductivity over a wide range of humidity. By constructing long-term durable MOF-based PEMs, a bridge between MOF and fuel cells was successfully established.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Engineering, Environmental
Lukka Thuyavan Yogarathinam, Juhana Jaafar, Ahmad Fauzi Ismail, Pei Sean Goh, Arthanareeswaran Gangasalam, Mohamad Fahrul Radzi Hanifah, Kar Chun Wong, Mahesan Naidu Subramaniam, Jerome Peter
Summary: Nanostructured materials, such as polyaniline coated activated boron nitride, have been embedded in sulfonated poly (ether ether ketone) membranes to enhance proton conductivity and reduce methanol permeability in direct methanol fuel cell applications. The addition of functionalized boron nitride improves water uptake, ion exchange capacity, and chemical stability of the membranes, while significantly reducing methanol permeability. These nanocomposite membranes exhibit improved performance compared to commercial Nafion membranes, with higher open circuit voltage and power density.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Review
Engineering, Biomedical
Jung-Hwan Lee, Dong-Hwee Kim, Hae-Hyoung Lee, Hae-Won Kim
Article
Chemistry, Physical
Yu-Jin Lee, Byung Yong Lee, Chang Won Yoon, Yong-Seok Lee, Hyangsoo Jeong, Sun-Hee Choi, Dong-Hwee Kim, Yongmin Kim, Kwang-Bum Kim, Suk Woo Nam
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Chemistry, Analytical
Jung-Won Park, Seong-Beom Han, Jungwon Hah, Geonhui Lee, Jeong-Ki Kim, Soo Hyun Kim, Dong-Hwee Kim
Article
Engineering, Biomedical
Geonhui Lee, Seong-Beom Han, Dong-Hwee Kim
Summary: Cell polarization, crucial in dynamic cellular processes, is precisely controlled by interactions between the nucleus and microtubule organizing center, involving cellular adhesion to extracellular matrix and nucleus-cytoskeletal connections. The localization of individual adhesive spots is more influential than cell shape in inducing intracellular polarization, with disruption of nuclear lamin A/C significantly reducing cell polarization. Geometrical cues guide intracellular polarization, determining directional cell migration through local activation of Cdc42.
Review
Biotechnology & Applied Microbiology
Juhyeon Jo, Sama Abdi Nansa, Dong-Hwee Kim
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Sunhong Min, Min Jun Ko, Hee Joon Jung, Wonsik Kim, Seong-Beom Han, Yuri Kim, Gunhyu Bae, Sungkyu Lee, Ramar Thangam, Hyojun Choi, Na Li, Jeong Eun Shin, Yoo Sang Jeon, Hyeon Su Park, Yu Jin Kim, Uday Kumar Sukumar, Jae-Jun Song, Seung-Keun Park, Seung-Ho Yu, Yun Chan Kang, Ki-Bum Lee, Qiang Wei, Dong-Hwee Kim, Seung Min Han, Ramasamy Paulmurugan, Young Keun Kim, Heemin Kang
Summary: This study demonstrates the remote control of nanostructure changes in ligand-presenting nanocoils to regulate cellular adhesion by cyclic stretching and shrinking. It shows promising potential for regulating mechanosensing-mediated differentiation of stem cells in vivo.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Gunhyu Bae, Yoo Sang Jeon, Min Jun Ko, Yuri Kim, Seong-Beom Han, Ramar Thangam, Wonsik Kim, Hee Joon Jung, Sungkyu Lee, Hyojun Choi, Sunhong Min, Hyunsik Hong, Sangwoo Park, Seong Yeol Kim, Kapil D. Patel, Na Li, Jeong Eun Shin, Bum Chul Park, Hyeon Su Park, Jun Hwan Moon, Yu Jin Kim, Uday Kumar Sukumar, Jae-Jun Song, Soo Young Kim, Seung-Ho Yu, Yun Chan Kang, Steve Park, Seung Min Han, Dong-Hwee Kim, Ki-Bum Lee, Qiang Wei, Liming Bian, Ramasamy Paulmurugan, Young Keun Kim, Heemin Kang
Summary: This study demonstrates a novel method to modulate the direct interaction between cells and ligand features at the molecular level, by controlling the unwinding and winding settings of nanohelices. This approach promotes the adhesion and polarization of macrophages, providing a theoretical basis for regenerative and anti-inflammatory immune responses to implants.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Seong-Beom Han, Bada Won, Seung-chan Yang, Dong-Hwee Kim
Summary: Low-molecular weight collagen peptides extracted from Asterias pectinifera have higher encapsulation efficiency compared to conventional sources like pork and fish, making them a promising eco-friendly material for anti-aging cosmetics. Their absorption rate can be enhanced using an elastic nanoliposome, which also exhibits inhibitory effects on photoaging caused by UV radiation.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Article
Engineering, Biomedical
Jeong-Ki Kim, Seong-Beom Han, Serk In Park, In-San Kim, Dong-Hwee Kim
Summary: Alternatively activated or M2 macrophages play a vital role in anti-inflammation, wound healing, and tissue repair. This study demonstrates that M2 activation requires mechanical cues from the extracellular microenvironment, and matrix rigidity-dependent macrophage spreading is mediated by F-actin formation. The study also identifies a new mechanosensing function of STAT6 in M2 activation.
Review
Pharmacology & Pharmacy
Jeongrae Kim, Yongwhan Choi, Dong-Hwee Kim, Hong Yeol Yoon, Kwangmeyung Kim
Summary: This review summarizes recent advances in the use of injectable hydrogels for combination immunotherapy in treating tumors. Injectable hydrogels, with their biocompatibility, degradability, and controllable properties, can effectively encapsulate various immunotherapeutic agents and elicit antitumor immune responses. The review also discusses the application of injectable hydrogels in chemoimmunotherapy, photoimmunotherapy, and radioimmunotherapy.
Article
Cell & Tissue Engineering
DoYeun Park, Donghak Kim, Su Jeong Park, Jeong Ho Choi, Yoojin Seo, Dong-Hwee Kim, Sang-Hoon Lee, Jung Keun Hyun, Jin Yoo, Youngmee Jung, Soo Hyun Kim
Summary: By combining micropattern-based fabrication method with stem-cell recruitment factor immobilization, a size-tunable nerve guidance conduit (NGC) with stem-cell recruitment capability was successfully developed, which enhances the guidance of nerve fiber regrowth and improves functional regeneration capacity. This method has wide applicability in improving the treatment of peripheral nerve injury and spinal cord injury.
NPJ REGENERATIVE MEDICINE
(2022)
Review
Chemistry, Multidisciplinary
Wan Su Yun, Jeongrae Kim, Dong-Kwon Lim, Dong-Hwee Kim, Seong Ik Jeon, Kwangmeyung Kim
Summary: In the past 30 years, various nano-sized drug delivery systems (nanoDDSs) have been extensively studied for cancer therapy. They can passively target tumors and have enhanced permeability and retention effect. However, their systemic administration has led to complications such as insufficient tumor targeting, undesirable biodistribution, and carrier-associated toxicity. This review summarizes recent advancements in intratumoral nanoDDS administration, discussing factors that enhance therapeutic efficacy and the application in various cancer therapies. Intratumoral administration of nanoDDSs has shown versatility in enhancing tumor-specific accumulation and minimizing side effects, making it a potential solution to improve therapeutic effects and reduce toxicities.
Review
Engineering, Biomedical
Rakesh Joshi, Seong-Beom Han, Won-Ki Cho, Dong-Hwee Kim
Summary: This article discusses the effects of nuclear deformation on cell morphology and gene expression, as well as the role of intracellular organelles in force transfer. It introduces the preparation and properties of engineered biomaterials, the principles of cellular traction force measurement tools, and the techniques for measuring nuclear mechanics. Finally, it outlines the principles of traction force microscopy, challenges in force remodeling, displacement tracking algorithms, and the extension of 2-dimensional TFM to multiscale TFM.
BIOMATERIALS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Gwan-Jin Ko, Soo Deok Han, Jeong-Ki Kim, Jia Zhu, Won Bae Han, Jinmook Chung, Seung Min Yang, Huanyu Cheng, Dong-Hwee Kim, Chong-Yun Kang, Suk-Won Hwang
NPG ASIA MATERIALS
(2020)
Article
Materials Science, Biomaterials
Seong-Beom Han, Jeong-Ki Kim, Geonhui Lee, Dong-Hwee Kim
ADVANCED BIOSYSTEMS
(2020)
