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Dr. Vu Khac Hoang Bui
Department of BioNano Technology, Gachon University

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Journal article
Published: 11 August 2021 in Chemosensors
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Light-activated nanozymes possess several advantages, such as light-mediated activity regulation, utilization of molecular oxygen as a green oxidant, and highly enhanced activity; however, the types of light-activated nanozymes are still limited. In this study, we found that Mg aminoclay-based Fe3O4/TiO2 hybrids (MgAC-Fe3O4/TiO2) exhibited peroxidase-like catalytic activity to catalyze the oxidation of the peroxidase substrate 2,2′-azino-bis(3-ethylbenzo-thiazoline-6-sulfonic acid) diammonium salt (ABTS) in the presence of H2O2, which was significantly enhanced under ultraviolet (UV)-light irradiation. Compared with MgAC-Fe3O4 and MgAC-TiO2, MgAC-Fe3O4/TiO2 showed around three-fold enhancement in the absorption intensity corresponding to the oxidized ABTS under UV-light irradiation, presumably due to the synergistic effect between Fe3O4 and TiO2, thereby facilitating photocatalytic electron transfer during the catalytic action. In addition, the MgAC-Fe3O4/TiO2 showed vivid stability enhancement in wide range of pH and temperature values compared with natural peroxidase. The UV-light-driven MgAC-Fe3O4/TiO2-based system was successfully applied for the colorimetric detection of phenolic compounds, including pyrocatechol and resorcinol, in a dynamic linear range of 0.15–1.30 mg/mL with a limit of detection as low as 0.1 mg/mL. Further, the system could successfully determine the phenolic compounds in spiked tap water, and thus, it can be used for practical applications. We believe that the UV-light-driven enhancement in the peroxidase-like catalytic performances highlights the potential of MgAC-Fe3O4/TiO2 for detecting phenolic compounds as well as other clinically and environmentally important substances.

ACS Style

Yoon Jung Jang; Vu Khac Hoang Bui; Phuong Thy Nguyen; Young-Chul Lee; Moon Il Kim. UV-Light-Driven Enhancement of Peroxidase-Like Activity of Mg-Aminoclay-Based Fe3O4/TiO2 Hybrids for Colorimetric Detection of Phenolic Compounds. Chemosensors 2021, 9, 219 .

AMA Style

Yoon Jung Jang, Vu Khac Hoang Bui, Phuong Thy Nguyen, Young-Chul Lee, Moon Il Kim. UV-Light-Driven Enhancement of Peroxidase-Like Activity of Mg-Aminoclay-Based Fe3O4/TiO2 Hybrids for Colorimetric Detection of Phenolic Compounds. Chemosensors. 2021; 9 (8):219.

Chicago/Turabian Style

Yoon Jung Jang; Vu Khac Hoang Bui; Phuong Thy Nguyen; Young-Chul Lee; Moon Il Kim. 2021. "UV-Light-Driven Enhancement of Peroxidase-Like Activity of Mg-Aminoclay-Based Fe3O4/TiO2 Hybrids for Colorimetric Detection of Phenolic Compounds." Chemosensors 9, no. 8: 219.

Review
Published: 04 August 2021 in Nanomaterials
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To enhance the performance of lithium-ion batteries, zinc oxide (ZnO) has generated interest as an anode candidate owing to its high theoretical capacity. However, because of its limitations such as its slow chemical reaction kinetics, intense capacity fading on potential cycling, and low rate capability, composite anodes of ZnO and other materials are manufactured. In this study, we introduce binary and ternary composites of ZnO with other metal oxides (MOs) and carbon-based materials. Most ZnO-based composite anodes exhibit a higher specific capacity, rate performance, and cycling stability than a single ZnO anode. The synergistic effects between ZnO and the other MOs or carbon-based materials can explain the superior electrochemical characteristics of these ZnO-based composites. This review also discusses some of their current limitations.

ACS Style

Vu Bui; Tuyet Pham; Jaehyun Hur; Young-Chul Lee. Review of ZnO Binary and Ternary Composite Anodes for Lithium-Ion Batteries. Nanomaterials 2021, 11, 2001 .

AMA Style

Vu Bui, Tuyet Pham, Jaehyun Hur, Young-Chul Lee. Review of ZnO Binary and Ternary Composite Anodes for Lithium-Ion Batteries. Nanomaterials. 2021; 11 (8):2001.

Chicago/Turabian Style

Vu Bui; Tuyet Pham; Jaehyun Hur; Young-Chul Lee. 2021. "Review of ZnO Binary and Ternary Composite Anodes for Lithium-Ion Batteries." Nanomaterials 11, no. 8: 2001.

Journal article
Published: 17 June 2021 in Applied Sciences
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In recent decades, harmful algal blooms (HABs) have been significantly affecting environments, aquatic ecosystems, and human health, as well as damaging economies, especially near rivers and lakes, and in coastal regions. Microcystis and Anabaena are two genera of harmful cyanobacteria that will often predominate during toxic microalgal blooms. In this study, we employ a method for control and mitigation of HABs by microalgal cell instability using different types of aminoclays (ACs). Allelopathic interactions between the two strains of algae are studied in mono-culture, co-culture, and filtrated cell-free medium in the presence of the ACs. The growth of the Anabaena strain is significantly reduced by the cyanobacterial strains in the co-culture media, and both are significantly affected by the Acs’-enhanced algicidal activity. Anabaena sp. KVSF7 shows higher sensitivity against the ACs than does Microcystis sp. KW. In this way, the algicidal activity of ACs is harnessed, the effects of which are in the order of aluminum aminoclay (AlAC) > magnesium aminoclay (MgAC) > calcium aminoclay (CaAC). The ammonium sites in the ACs carry positive charges to induce instability of HABs along with the electrostatic attraction between algal cells and AC. Therefore, the utilization of the algicidal activity of the ACs can effectively reduce HABs, especially on cyanobacterial blooms.

ACS Style

Minh Nguyen; Vu Bui; Chi-Yong Ahn; Hee-Mock Oh; Jin-Soo Koh; Ju-Young Moon; Young-Chul Lee. Loading Effects of Aminoclays in Co-Culture of Two Cyanobacterial Microcystis and Anabaena Species as an Algicidal Role. Applied Sciences 2021, 11, 5607 .

AMA Style

Minh Nguyen, Vu Bui, Chi-Yong Ahn, Hee-Mock Oh, Jin-Soo Koh, Ju-Young Moon, Young-Chul Lee. Loading Effects of Aminoclays in Co-Culture of Two Cyanobacterial Microcystis and Anabaena Species as an Algicidal Role. Applied Sciences. 2021; 11 (12):5607.

Chicago/Turabian Style

Minh Nguyen; Vu Bui; Chi-Yong Ahn; Hee-Mock Oh; Jin-Soo Koh; Ju-Young Moon; Young-Chul Lee. 2021. "Loading Effects of Aminoclays in Co-Culture of Two Cyanobacterial Microcystis and Anabaena Species as an Algicidal Role." Applied Sciences 11, no. 12: 5607.

Journal article
Published: 03 August 2020 in Applied Surface Science
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A tin-aminoclay/reduced graphene oxide (SnO2-SnAC/rGO) electrode with significantly enhanced electrochemical performance was successfully fabricated by a facile two-step method entailing microwave treatment (1st step) and heat treatment (2nd step) synthesis processes. In step 1, the complete reduction of GO to rGO by microwave ensures the removal of most oxygen-containing functional groups on the material surface leading to improvement of its electrical conductivity along with the formation of SnO2 dots of 3–4 nm diameter. In step 2, the tin crystals are formed more stably in the SnAC/rGO framework by the heat-treatment process under Argon (Ar) gas via the direct conversion process of Sn2+ active sites within the SnAC structure. With this two-step process, the synthesized material possesses many unique synergistic effects, all leading to beneficial features (i.e., improved specific capacity, high rate capability, and long cycle life stability compared with SnO2-SnAC and pure rGO electrodes) for application to battery electrodes. Especially, SnO2-SnAC/rGO-500 °C (1:1) exhibits outstanding performance in terms of cyclic performance (650 mAh g−1 after 100 cycles at 100 mA g−1) and rate capability.

ACS Style

Tuyet Nhung Pham; Jaewook Ko; Vu Khac Hoang Bui; Seongjoon So; Hyun Uk Lee; Jaehyun Hur; Young-Chul Lee. Facile two-step synthesis of innovative anode design from tin-aminoclay (SnAC) and rGO for Li-ion batteries. Applied Surface Science 2020, 532, 147435 .

AMA Style

Tuyet Nhung Pham, Jaewook Ko, Vu Khac Hoang Bui, Seongjoon So, Hyun Uk Lee, Jaehyun Hur, Young-Chul Lee. Facile two-step synthesis of innovative anode design from tin-aminoclay (SnAC) and rGO for Li-ion batteries. Applied Surface Science. 2020; 532 ():147435.

Chicago/Turabian Style

Tuyet Nhung Pham; Jaewook Ko; Vu Khac Hoang Bui; Seongjoon So; Hyun Uk Lee; Jaehyun Hur; Young-Chul Lee. 2020. "Facile two-step synthesis of innovative anode design from tin-aminoclay (SnAC) and rGO for Li-ion batteries." Applied Surface Science 532, no. : 147435.

Review
Published: 18 June 2020 in Nanomaterials
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Titanium dioxide nanoparticles (TiO2 NPs) have some limitations, such as their low surface area, high bandgap energy, and low recycling ability. To overcome these limitations, TiO2 can be prepared in microscale/macroscale structures. TiO2 microscale structures, in comparison with TiO2 nanopowder, have higher surface areas, more tunable pore structures, and better top photocatalytic activity. In contrast, for TiO2 macroscale structures, although the surface area is lower than TiO2 nanopowder in many cases, they still achieve similar or better photocatalytic performance due to their unique properties. Moreover, both TiO2 microscale and macroscale structures can be easily recovered from reaction media. The difference between these two types of TiO2 structures is a function not only of size but also of the preparation process. Every type of TiO2 structure has its own advantages and disadvantages, as will be discussed further in the following pages. Future perspectives on this research field also will be discussed.

ACS Style

Vu Khac Hoang Bui; Vinh Van Tran; Ju-Young Moon; Duckshin Park; Young-Chul Lee. Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review. Nanomaterials 2020, 10, 1190 .

AMA Style

Vu Khac Hoang Bui, Vinh Van Tran, Ju-Young Moon, Duckshin Park, Young-Chul Lee. Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review. Nanomaterials. 2020; 10 (6):1190.

Chicago/Turabian Style

Vu Khac Hoang Bui; Vinh Van Tran; Ju-Young Moon; Duckshin Park; Young-Chul Lee. 2020. "Titanium Dioxide Microscale and Macroscale Structures: A Mini-Review." Nanomaterials 10, no. 6: 1190.

Review
Published: 26 January 2020 in Atmosphere
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The measurement of deposited aerosol particles in the respiratory tract via in vivo and in vitro approaches is difficult due to those approaches’ many limitations. In order to overcome these obstacles, different computational models have been developed to predict the deposition of aerosol particles inside the lung. Recently, some remarkable models have been developed based on conventional semi-empirical models, one-dimensional whole-lung models, three-dimensional computational fluid dynamics models, and artificial neural networks for the prediction of aerosol-particle deposition with a high accuracy relative to experimental data. However, these models still have some disadvantages that should be overcome shortly. In this paper, we take a closer look at the current research trends as well as the future directions of this research area.

ACS Style

Vu Khac Hoang Bui; Ju-Young Moon; Minhe Chae; Duckshin Park; Young-Chul Lee. Prediction of Aerosol Deposition in the Human Respiratory Tract via Computational Models: A Review with Recent Updates. Atmosphere 2020, 11, 137 .

AMA Style

Vu Khac Hoang Bui, Ju-Young Moon, Minhe Chae, Duckshin Park, Young-Chul Lee. Prediction of Aerosol Deposition in the Human Respiratory Tract via Computational Models: A Review with Recent Updates. Atmosphere. 2020; 11 (2):137.

Chicago/Turabian Style

Vu Khac Hoang Bui; Ju-Young Moon; Minhe Chae; Duckshin Park; Young-Chul Lee. 2020. "Prediction of Aerosol Deposition in the Human Respiratory Tract via Computational Models: A Review with Recent Updates." Atmosphere 11, no. 2: 137.

Review
Published: 29 July 2019 in Applied Sciences
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Microalgae have been considered as one of the most promising biomass feedstocks for various industrial applications such as biofuels, animal/aquaculture feeds, food supplements, nutraceuticals, and pharmaceuticals. Several biotechnological challenges associated with algae cultivation, including the small size and negative surface charge of algal cells as well as the dilution of its cultures, need to be circumvented, which increases the cost and labor. Therefore, efficient biomass recovery or harvesting of diverse algal species represents a critical bottleneck for large-scale algal biorefinery process. Among different algae harvesting techniques (e.g., centrifugation, gravity sedimentation, screening, filtration, and air flotation), the flocculation-based processes have acquired much attention due to their promising efficiency and scalability. This review covers the basics and recent research trends of various flocculation techniques, such as auto-flocculation, bio-flocculation, chemical flocculation, particle-based flocculation, and electrochemical flocculation, and also discusses their advantages and disadvantages. The challenges and prospects for the development of eco-friendly and economical algae harvesting processes have also been outlined here.

ACS Style

Ibrahim A. Matter; Vu Khac Hoang Bui; Mikyoung Jung; Jung Yoon Seo; Young-Eun Kim; Young-Chul Lee; You-Kwan Oh. Flocculation Harvesting Techniques for Microalgae: A Review. Applied Sciences 2019, 9, 3069 .

AMA Style

Ibrahim A. Matter, Vu Khac Hoang Bui, Mikyoung Jung, Jung Yoon Seo, Young-Eun Kim, Young-Chul Lee, You-Kwan Oh. Flocculation Harvesting Techniques for Microalgae: A Review. Applied Sciences. 2019; 9 (15):3069.

Chicago/Turabian Style

Ibrahim A. Matter; Vu Khac Hoang Bui; Mikyoung Jung; Jung Yoon Seo; Young-Eun Kim; Young-Chul Lee; You-Kwan Oh. 2019. "Flocculation Harvesting Techniques for Microalgae: A Review." Applied Sciences 9, no. 15: 3069.

Review
Published: 17 December 2018 in International Journal of Environmental Research and Public Health
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This review clarifies particulate matter (PM) pollution, including its levels, the factors affecting its distribution, and its health effects on passengers waiting at bus stations. The usual factors affecting the characteristics and composition of PM include industrial emissions and meteorological factors (temperature, humidity, wind speed, rain volume) as well as bus-station-related factors such as fuel combustion in vehicles, wear of vehicle components, cigarette smoking, and vehicle flow. Several studies have proven that bus stops can accumulate high PM levels, thereby elevating passengers’ exposure to PM while waiting at bus stations, and leading to dire health outcomes such as cardiovascular disease (CVD), respiratory effects, and diabetes. In order to accurately predict PM pollution, an artificial neural network (ANN) and adaptive neuro-fuzzy inference systems (ANFIS) have been developed. ANN is a data modeling method of proven effectiveness in solving complex problems in the fields of alignment, prediction, and classification, while the ANFIS model has several advantages including non-requirement of a mathematical model, simulation of human thinking, and simple interpretation of results compared with other predictive methods.

ACS Style

Le Thi Nhu Ngoc; Minjeong Kim; Vu Khac Hoang Bui; Duckshin Park; Young-Chul Lee. Particulate Matter Exposure of Passengers at Bus Stations: A Review. International Journal of Environmental Research and Public Health 2018, 15, 2886 .

AMA Style

Le Thi Nhu Ngoc, Minjeong Kim, Vu Khac Hoang Bui, Duckshin Park, Young-Chul Lee. Particulate Matter Exposure of Passengers at Bus Stations: A Review. International Journal of Environmental Research and Public Health. 2018; 15 (12):2886.

Chicago/Turabian Style

Le Thi Nhu Ngoc; Minjeong Kim; Vu Khac Hoang Bui; Duckshin Park; Young-Chul Lee. 2018. "Particulate Matter Exposure of Passengers at Bus Stations: A Review." International Journal of Environmental Research and Public Health 15, no. 12: 2886.

Journal article
Published: 26 May 2018 in Energies
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In this paper, we describe the synthesis of magnesium aminoclay-iron oxide (MgAC-Fe3O4) hybrid composites for microalgae-harvesting application. MgAC-templated Fe3O4 nanoparticles (NPs) were synthesized in different ratios of MgAC and Fe3O4 NPs. The uniform distribution of Fe3O4 NPs in the MgAC matrix was confirmed by transmission electron microscopy (TEM). According to obtained X-ray diffraction (XRD) patterns, increased MgAC loading leads to decreased intensity of the composites’ (311) plane of Fe3O4 NPs. For harvesting of Chlorella sp. KR-1, Scenedesmus obliquus and mixed microalgae (Chlorella sp. KR-1/ Scenedesmus obliquus), the optimal pH was 4.0. At higher pHs, the microalgae-harvesting efficiencies fell. Sample #1, which had the highest MgAC concentration, showed the most stability: the harvesting efficiencies for Chlorella sp. KR-1, Scenedesmus obliquus, and mixed microalgae were reduced only to ~50% at pH = 10.0. The electrostatic interaction between MgAC and the Fe3O4 NPs in the hybrid samples by microalgae, as confirmed by zeta potential measurements, were attributed to the harvesting mechanisms. Moreover, the zeta potentials of the MgAC-Fe3O4 hybrid composites were reduced as pH was increased, thus diminishing the microalgae-harvesting efficiencies.

ACS Style

Bohwa Kim; Vu Khac Hoang Bui; Wasif Farooq; Sang Goo Jeon; You-Kwan Oh; Young-Chul Lee. Magnesium Aminoclay-Fe3O4 (MgAC-Fe3O4) Hybrid Composites for Harvesting of Mixed Microalgae. Energies 2018, 11, 1359 .

AMA Style

Bohwa Kim, Vu Khac Hoang Bui, Wasif Farooq, Sang Goo Jeon, You-Kwan Oh, Young-Chul Lee. Magnesium Aminoclay-Fe3O4 (MgAC-Fe3O4) Hybrid Composites for Harvesting of Mixed Microalgae. Energies. 2018; 11 (6):1359.

Chicago/Turabian Style

Bohwa Kim; Vu Khac Hoang Bui; Wasif Farooq; Sang Goo Jeon; You-Kwan Oh; Young-Chul Lee. 2018. "Magnesium Aminoclay-Fe3O4 (MgAC-Fe3O4) Hybrid Composites for Harvesting of Mixed Microalgae." Energies 11, no. 6: 1359.

Journal article
Published: 01 March 2018 in Chemical Engineering Journal
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Clay has been widely used since Antiquity. However, its application remains limited due to its low dispersion in water. In this review paper, we introduce amino organophyllosilicates (hereafter: aminoclays), which are synthesized by metal salt and organotrialkoxylane at room temperature. Such organic-inorganic materials have been applied in different areas. There is also the strategy of incorporating aminoclays with another material in order to expand its potential. However, the cytotoxicity of some aminoclays toward mammalian cells has to be reduced before application in practical fields. By evaluating the latest research papers, we take a closer look at the applications of various aminoclays in biological as well as environmental fields.

ACS Style

Vu Khac Hoang Bui; Duckshin Park; Young-Chul Lee. Aminoclays for biological and environmental applications: An updated review. Chemical Engineering Journal 2018, 336, 757 -772.

AMA Style

Vu Khac Hoang Bui, Duckshin Park, Young-Chul Lee. Aminoclays for biological and environmental applications: An updated review. Chemical Engineering Journal. 2018; 336 ():757-772.

Chicago/Turabian Style

Vu Khac Hoang Bui; Duckshin Park; Young-Chul Lee. 2018. "Aminoclays for biological and environmental applications: An updated review." Chemical Engineering Journal 336, no. : 757-772.

Journal article
Published: 03 February 2018 in Sensors
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In this study, we describe a novel peroxidase-like activity of Co-aminoclay [CoAC] present at pH ~5.0 and its application to fluorescent biosensor for the determination of H2O2 and glucose. It is synthesized with aminoclays (ACs) entrapping cationic metals such as Fe, Cu, Al, Co., Ce, Ni, Mn, and Zn to find enzyme mimicking ACs by sol–gel ambient conditions. Through the screening of catalytic activities by the typical colorimetric reaction employing 2,2′-azino-bis(3-ethylbenzo-thiazoline-6-sulfonic acid)diammonium salt (ABTS) as a substrate with or without H2O2, Fe, Cu, and CoACs are found to exhibit peroxidase-like activity, as well as oxidase-like activity was observed from Ce and MnACs. Among them, CoAC shows exceptionally high peroxidase-like activity, presumably due to its ability to induce electron transfer between substrates and H2O2. CoAC is then used to catalyze the oxidation of Amplex® UltraRed (AUR) into a fluorescent end product, which enables a sensitive fluorescent detection of H2O2. Moreover, a highly sensitive and selective glucose biosensing strategy is developed, based on enzyme cascade reaction between glucose oxidase (GOx) and CoAC. Using this strategy, a highly linear fluorescence enhancement is verified when the concentration of glucose is increased in a wide range from 10 μM to 1 mM with a lower detection limit of 5 μM. The practical diagnostic capability of the assay system is also verified by its use to detect glucose in human blood serum. Based on these results, it is anticipated that CoAC can serve as potent peroxidase mimetics for the detection of clinically important target molecules.

ACS Style

Han Pill Song; Yongil Lee; Vu Khac Hoang Bui; You-Kwon Oh; Hyun Gyu Park; Moon Il Kim; Young-Chul Lee. Effective Peroxidase-Like Activity of Co-Aminoclay [CoAC] and Its Application for Glucose Detection. Sensors 2018, 18, 457 .

AMA Style

Han Pill Song, Yongil Lee, Vu Khac Hoang Bui, You-Kwon Oh, Hyun Gyu Park, Moon Il Kim, Young-Chul Lee. Effective Peroxidase-Like Activity of Co-Aminoclay [CoAC] and Its Application for Glucose Detection. Sensors. 2018; 18 (2):457.

Chicago/Turabian Style

Han Pill Song; Yongil Lee; Vu Khac Hoang Bui; You-Kwon Oh; Hyun Gyu Park; Moon Il Kim; Young-Chul Lee. 2018. "Effective Peroxidase-Like Activity of Co-Aminoclay [CoAC] and Its Application for Glucose Detection." Sensors 18, no. 2: 457.

Review
Published: 09 January 2017 in Polymers
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Chitosan is a natural polymer that has been widely utilized for many purposes in the food, textile, agriculture, water treatment, cosmetic and pharmaceutical industries. Based on its characteristics, including biodegradability, non-toxicity and antimicrobial properties, it has been employed effectively in wound healing applications. Importantly, however, it is necessary to improve chitosan’s capacities by combination with zinc oxide (ZnO), titanium dioxide (TiO2) and silver (Ag) nanoparticles (NPs). In this review of many of the latest research papers, we take a closer look at the antibacterial effectiveness of chitosan combined with ZnO, TiO2 and Ag NPs and also evaluate the specific wound healing application potentials.

ACS Style

Vu Khac Hoang Bui; Duckshin Park; Young-Chul Lee. Chitosan Combined with ZnO, TiO2 and Ag Nanoparticles for Antimicrobial Wound Healing Applications: A Mini Review of the Research Trends. Polymers 2017, 9, 21 .

AMA Style

Vu Khac Hoang Bui, Duckshin Park, Young-Chul Lee. Chitosan Combined with ZnO, TiO2 and Ag Nanoparticles for Antimicrobial Wound Healing Applications: A Mini Review of the Research Trends. Polymers. 2017; 9 (12):21.

Chicago/Turabian Style

Vu Khac Hoang Bui; Duckshin Park; Young-Chul Lee. 2017. "Chitosan Combined with ZnO, TiO2 and Ag Nanoparticles for Antimicrobial Wound Healing Applications: A Mini Review of the Research Trends." Polymers 9, no. 12: 21.