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The trends of tropical technologies in the context of green and sustainable chemical engineering
( Tran Dai Lam ) 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Tropical climate is well-known as an aggressive environment for materials. To extend their used life-time, the protected coating (organic and inorganic) is one of the most popular solutions. Although the method worked very well, but they provide an important damage for the human environment through the electrolytes, additives or solvents used in the deposited process. The high toxicity as chromate (VI) compounds have been restricted and limited since the beginning of the 1990s. To keep the high effective protection of the coatings, many inorganic/organic additives, that are more friendly-environment, have been studied, such as the salts of cerium (Ce), cobalt (Co), lithium (Li),... or 8-hydroxyquinoline (8-HQ), 1-hydroxy-benzotriazole (HBT), 2-benzothiazolylthio-succinic acid (BTSA),..., and the nanocontainer such as hydrotalcite, graphene, porous silica,... Beside, in the organic coatings field, the used of waterborne system (for epoxy, polyurethane, polyacrylic paints) is increasingly concerned in the industrial and civil applications.
A Novel Chitosan-Gossypol Based Nanocarrier for Anticancer Curcumin Drug Delivery
( Ngoan Thi Nguyen ),( Lam Dai Tran ),( Duong Quang Le ),( Dien Gia Pham ),( Phuc Xuan Nguyen ),( Jun Seo Park ),( Jae Kweon Park ) 한국키틴키토산학회 2012 한국키틴키토산학회지 Vol.17 No.2
Gossypol chitosan (GPCS) nanoparticles have been successfully synthesized at the size of 20-40 nm through amidation process to forming base shift of polymer chains of chitosan using gossypol as a crosslinking agent. Their structure was confirmed by Fourier Transformed Infra Red (FT-IR) spectra. Morphology, stability, loading and releasing efficiency of GPCS and Cur/GPCS (Cur stands for curcumin) were thoroughly investigated by Field Emission Scanning Electron Microscopy (FESEM), FT-IR, Ultra Violet-Visible spectrophotometry (UV-Vis) and High Resolve Photoluminescence System (HRPLS). The obtained nanocarrier exhibited an excellent solubility for Cur anticancer drug as well as high stability for in vitro studies. An intensive fluorescence, allowing drug monitor/delivery, was achieved. Drug release profile was also studied. GPCS, therefore, could be considered to be a potential drug carrier for therapeutic treatment.
Biomedical and Environmental Applications of Chitosan-based Nanomaterials
( Jae Kweon Park ),( Lam Dai Tran ),( Hoang Vinh Tran ),( Trang Thu Mai ),( Thu Phuong Ha ),( Binh Hai Nguyen ),( Hoang Thai ),( Hoang Dinh Vu ),( Dien Gia Pham ),( Phuc Xuan Nguyen ) 한국키틴키토산학회 2011 한국키틴키토산학회지 Vol.16 No.1
Being naturally abundant resources and having many interesting physicochemical and biological properties, chitin/chitosan have been found useful in many fields. This paper describes the strategy to design a multifunctional, chitosan based nanomaterials and their biomedical and environmental applications. Different physicochemical methods including FESEM/TEM, PPMS were used to characterize the obtained nanomaterials. For each application, a series of specific characterizing methods were used for evaluating the applicability/capacity of materials.
Ngoan Thi Nguyen,Dai Lam Tran,Duc Cuong Nguyen,Thai Loc Nguyen,Thi Cham Ba,Binh Hai Nguyen,Thi Duong Ba,Nam Hong Pham,Dzung Tuan Nguyen,Thai Hoa Tran,Gia Dien Pham 한국물리학회 2015 Current Applied Physics Vol.15 No.11
Nanocomposites containing two or more functional constituents are attractive candidates for advanced nanomaterials. In this study, multifunctional Ag/Fe3O4-CS nanocomposites were successfully prepared, using chitosan as a stabilizing and cross-linking agent. The as-synthesized nanocomposites were characterized by Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), X-ray diffraction (XRD), Energy-dispersive X-ray spectroscopy (EDS), UVevisible spectrophotometer (UVeVis) and vibrating sample magnetometer (VSM). The results demonstrated that Ag/Fe3O4-CS composite nanoparticles (NPs) were composed of parent components, Fe3O4 and Ag NPs, which were uniformly dispersed in the chitosan matrix. The hybrid NPs exhibited strong antibacterial property against Pseudomonas aeruginosa. With high magnetization value (67 emu/g), the synthesized Ag/Fe3O4-CS composite can be easily separated or recycled in potential biomedical applications. Furthermore, the results showed that the multicomponent hybrid nanostructures appeared to be the promising material for local hyperthermia, which can be used as thermoseeds for localized hyperthermia treatment of cancers.
Do Ngoc Khue,Tran Dai Lam,Nguyen Van Chat,Vu Quang Bach,Do Binh Minh,Vu Duc Loi,Nguyen Van Anh 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
Here we report the study on the utilization of several advanced oxidation processes such as electro-oxidation and Fenton process in simultaneous treatment of two nitramine explosives: 2,4,6-trinitrophenyl-N-metylnitramine (Tetryl) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX). The preliminary tests indicated that the electrolytic method using a TiO2/IrO2/RuO2-coated electrode could rapidly degrade Tetryl but not RDX. While the addition of certain amount of H2O2 induced an increase of Tetryl degradation yield but had insignificant effect on RDX decomposition, the use of Fenton’s reagent showed an enhanced efficiency in degradation of both nitramines. It can be concluded that among tested processes, Fenton process is the most effective for treatment of nitramine-containing wastewaters.
( Yong Il Park ),( Joo Woong Park ),( Lam Dai Tran ),( Hee Seo Kim ),( Jae Kweon Park ) 한국키틴키토산학회 2011 한국키틴키토산학회지 Vol.16 No.2
Various sizes of chitosan ranging from 3 to 60 kDa were prepared to assess the effect of molecular weight on antimicrobial activity by enzymatic digestion of chitosan using chitosanase isolated and partially purified from the culture medium of Bacillus subtillis, isolated and identified as a bacterial strain producing chitosanolytic enzymes. Consequently, influence of antimicrobial activity of chitosan series with different molecular weights was addressed with MMC-P1, grapefruit seed extract, potassium sorbate, and sodium benzonate toward non- and antibiotics resistant microorganisms. The results suggest that specific molecular weight of chitosan, called medium molecular weight chitosan (MMC-P1) and low molecular weight chitosan (LMWC), may be a predominant factor either directly or indirectly affecting on broad antimicrobial activities, especially which has shown the higher antimicrobial activity toward especially antibiotics resistant microorganisms such as methicillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa.
Crystal facet engineering induced anisotropic transport of charge carriers in a perovskite
Yang, Hewei,Zhou, Yunzhan,Yang, Yijun,Yi, Ding,Ye, Tao,Lam, Tran Dai,Golberg, Dmitri,Bao, Bate,Yao, Jiannian,Wang, Xi The Royal Society of Chemistry 2018 Journal of Materials Chemistry C Vol.6 No.43
<P>Precise control of crystal orientations and macroscopic morphology of a perovskite crystal is crucial for various optoelectronic applications relying on charge carrier transport tuning along exposed crystal facets. Here, taking methylammonium lead bromide (CH3NH3PbBr3) as an example, and employing a novel crystal facet engineering method, we successfully construct two kinds of perovskite crystals with exposed {001} and {110} facets. We find that the free carriers’ photoluminescence lifetime on the {001} facets can be 3 times longer than that on {110} facets. The related mechanisms are investigated <I>via</I> fluorescence lifetime imaging microscopy and <I>in situ</I> transmission electron microscopy. These indicate that the different trap state density of exposed facets and crystal structure changing of CH3NH3PbBr3 under light and electron beam irradiation lead to the differences in carrier transport along different facets. By distinguishing the charge carrier transport on different CH3NH3PbBr3 exposed facets, micro-photodetectors have been constructed. A device fabricated with the {001} exposed facets exhibited two orders of magnitude higher photocurrent and half as much dark current as a {110} facet-based device. Thus, the crystal facet engineering of perovskites can be widely adopted for understanding physical/chemical properties of perovskite crystals and provides great potential for novel perovskite optoelectronic device applications.</P>