http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Nguyen Van Hieu,Le Thi Ngoc Loan,Nguyen Duc Khoang,Nguyen Tuan Minh,Do Thanh Viet,Do Cong Minh,Tran Trung,Nguyen Duc Chien 한국물리학회 2010 Current Applied Physics Vol.10 No.2
In this paper, a very simple procedure was presented for the reproducible synthesis of large-area SnO2nanowires (NWs) on a silicon substrate by evaporating Sn powders at temperatures of 700, 750, and 800 ℃. As-obtained SnO2 NWs were characterized by field emission scanning electron microscopy (FESEM),transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy. They revealed that the morphology of the NWs is affected by growth temperature and the SnO2 NWs are single-crystalline tetragonal. The band gap of the NWs is in the range of 4.2–4.3 eV as determined from UV/visible absorption. The NWs show stable photoluminescence with an emission peak centered at around 620 nm at room-temperature. The sensors fabricated from the SnO2 NWs synthesized at 700 ℃ exhibited good response to LPG (liquefied petroleum gas) at an operating temperature of 400 ℃.
Chien Minh Tran,Ngoc Thi‑Thanh Nguyen,Minh Hieu Ho,Vinh Khanh Doan,Khanh Loan Ly,Nhi Ngoc‑Thao Dang,Nam Minh‑Phuong Tran,Hoai Thi‑Thu Nguyen,Long Phuoc Truong,Thai Minh Do,Quyen Ngoc Tran,Hien Quoc Ng 한국섬유공학회 2023 Fibers and polymers Vol.24 No.1
In this study, we proposed a straightforward electrospun polycaprolactone (PCL) loaded with silver nanoparticles (SNPs)membrane fabrication process, in which SNPs were directly synthesized from silver nitrate (AgNO3) in PCL–acetone mixtureby gamma irradiation. The insolubility of AgNO3in PCL solution was solved using an auxiliary dimethyl sulfoxide solvent. As a physical approach, gamma rays readily converted silver ions into SNPs without the addition of harmful reductionagents, which reduced the cytotoxicity of the synthesized material. By avoiding some processes such as purification, solventremoval, or redispersion of SNPs, this method was more time-saving compared to other related studies. SNPs formation wasconfirmed by both UV–Visible spectrum (UV–Vis) and X-ray diffraction analysis. Scanning electron microscopy (SEM)revealed that the addition of SNPs significantly reduced the fiber diameter of PCL–Ag membranes compared to that of rawPCL. Uniform spherical-shaped SNPs incorporated in PCL fibers were observed under transmission electron microscopy(TEM). The tensile test showed that the electrospun PCL–Ag membranes exhibited good mechanical characteristics. Moistureeasily penetrated the porous microstructure of PCL–Ag, facilitating wound humidity regulation. Inductively coupledplasma-mass spectroscopy (ICP-MS) was employed to study the release profiles of SNPs at different time intervals. Overall,the PCL–Ag 500 ppm sample exerted excellent antibacterial activity against Pseudomonas aeruginosa and Staphylococcusaureus strains and low in vitro cytotoxicity.
Bao Ngoc Tran,Hanh Thuy Nguyen,김종오,용철순,Chien Ngoc Nguyen 대한약학회 2017 Archives of Pharmacal Research Vol.40 No.12
The CD44 receptor, which is upregulated inmany cancer cells, provides a selective cellular surface fortargeted drug delivery systems. We developed a hybridnanocarrier for the CD44-targeted delivery of ibuprofen(IBU) and paclitaxel (PTX). The solid lipid nanoparticles(SLNs) were prepared by a hot-melt oil/water emulsiontechnique and then coated with hyaluronic acid (HA) byelectrostatic interactions. The final SLN were sphericalwith a hydrodynamic diameter (Z) of 72.16 ± 2.9 nm,polydispersity index (PDI) of 0.276 ± 0.009, and zetapotential (ZP) of 28.20 ± 0.69 mV. Similarly, SLN coatedwith HA (SLN-HA) exhibited acceptable physical properties(Z 169.3 ± 0.55 nm, PDI 0.285 ± 0.004, and ZP- 10.5 ± 0.15 mV). Cell viability assays showed that thecombination of IBU, a chemopreventive agent, and PTXexerted a synergistic inhibitory effect on the proliferationof cancer cells (CI\1.0). Additionally, our observationsindicated that both SLN and SLN-HA enhanced apoptosisand cellular uptake compared to the cocktail of free drugs. HA indicated its affinity for cancer cells through theimprovement of cellular uptake and induction of apoptosis. These results clearly indicated that these nanoparticlesystems hold great promise for drug delivery in breastcancer treatment.
Some Results of Recent Investigation and Application of Rubber Blends in Vietnam
Bui Chuong,Nguyen Thanh Liem,Dang Viet Hung,Nguyen Huy Tung,Nguyen Pham Duy Linh,Nguyen Thanh Nhan,Pham Ngoc Linh,Le Anh Kien,Chu Chien Huu 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
We have investigated the change of tensile strength (TS) of Natural rubber/chloroprene rubber (NR/CR) blends during combination ageing, including heating and dynamic mechanical loading. Using model of statistical experiment, we built the equation describing the dependence of TS on four factors: temperature T, number of cyclic loadings N, contents of NR (C<sub>NR</sub>) and chloroprene (CCR). This equation allows predict the TS change of NR/CR blends after combination ageing with accepted inaccuracy – less than 10%. We also investigated the effect of nanofillers, such as nanoclay, SiO2, Fe<sub>3</sub>O4, on adhesion of some rubber blends to polyester and steel cords. It was found, in the case of EPDM/CIIR rubber blends, both nanoclay and SiO2 have no effect on adhesion to steel cords, while nano SiO2 may enhance adhesion to polyester cords. On other side, Fe<sub>3</sub>O4 may remarkably enhance adhesion of NR/CR blends to steel. Mentioned results are successfully applied in some practical rubber products working under fatigue conditions, such as rubber/steel antivibration pad for locomotive, heat resistant conveyor, water dam, underwater lift bag.
( Tuan Hiep Tran ),( Tuan Duc Nguyen ),( Han Van Nguyen ),( Hanh Thuy Nguyen ),( Jong Oh Kim ),( Chul Soon Yong ),( Chien Ngoc Nguyen ) 영남대학교 약품개발연구소 2016 영남대학교 약품개발연구소 연구업적집 Vol.26 No.-
Polyro.t-lactic-co-glycolic acid) (PLGA) nanoparticles with negative surface charge were reversed to positive by cationic surfactant-DDAB before being coated with an anionic polymer, hyaluronic acid, to improve their site-specific intracellular delivery against CD44 receptor overexpressing cancer cells. Incorporating artesunate (ART)-a promising anticancer drug into PLGA/HA nanoparticles, is expected not only to overcome its poor aqueous solubility and stability but also enhance the activities. The obtained particles were characterized by dynamic light scattering, zeta potential measurements, and transmission electron microscopy (TEM). Cancer cell internalization of the NPs was evaluated by flow cytometry and cytotoxicity of the NPs was tested by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl tetrazolium bromide assay. PLGA/HA nanoparticles showed greater extent of cellular uptake to SCC-7 and MCF-7 cells, indicating their affinity with CD44 receptor-mediated endocytosis. Almost 60 % of ART was released into the outer media after 48 h. In vitro fluorescence sorting demonstrated that PLGA/HA had highly efficient targeting and accumulation into CD44 receptor overexpression cells. The significant reduction in cell viability as well as greater induction of apoptosis suggested a potential in anticancer therapy of ART loaded PLGA/HA.
Gas Sensing Characteristics of Polyaniline Single-Wall Carbon Nanotube Composites
Duong Ngoc Huyen,Nguyen Duc Chien 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
A composite of polyaniline (PANi) and single-wall carbon nanotubes (SWNTs) is created when aniline and oxidant are added into the acidic medium used for the purication of SWNTs. Raman and FTIR spectra indicate variations in the intensity and shifts in positions of the adsorption bands assigned to the vibration modes standing for PANi. The results are interpreted as being due to modications in the chemical and the electronic structures of PANi. The addition of SWNTs in PANi enhances the degree of oxidation of emeradine PANi and is considered as a physical doping for PANi conductivity. The presence of SWNTs in the PANi-SWNTs composite alters the polaron and the bipolaron lower levels in the PANi band gap. As a result, PANi-SWNT composites exhibit signicantly improved in gas-sensing characteristics. A composite of polyaniline (PANi) and single-wall carbon nanotubes (SWNTs) is created when aniline and oxidant are added into the acidic medium used for the purication of SWNTs. Raman and FTIR spectra indicate variations in the intensity and shifts in positions of the adsorption bands assigned to the vibration modes standing for PANi. The results are interpreted as being due to modications in the chemical and the electronic structures of PANi. The addition of SWNTs in PANi enhances the degree of oxidation of emeradine PANi and is considered as a physical doping for PANi conductivity. The presence of SWNTs in the PANi-SWNTs composite alters the polaron and the bipolaron lower levels in the PANi band gap. As a result, PANi-SWNT composites exhibit signicantly improved in gas-sensing characteristics.
Sy-Ngoc Nguyen,Chien Truong-Quoc,Jang-woo Han,Sunyoung Im,Maenghyo Cho 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10
Recurrent neural network (RNN)-based accelerated prediction was achieved for the long-term time-dependent behavior of viscoelastic composite laminated Mindlin plates subjected to arbitrary mechanical and hygrothermal loading. Time-integrated constitutive stressstrain relation was simplified via Laplace transform to a linear system to reduce the computational storage. A fast converging smooth finite element method named cell-based smoothed discrete shear gap was employed to enhance the data generation procedure for straining RNNs with a sparse mesh. This technique is applicable under varying hygrothermal conditions for real engineering structure problems with fluctuating temperature and moisture. Hence, accurate RNN-based long-term deformation prediction for laminated structures was realized using the history of environmental temperature and moisture condition.
Hanh Thuy Nguyen,Tuan Hiep Tran,김종오,용철순,Chien Ngoc Nguyen 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.5
Artesunate (ART)—a well-known anti-malarialagent is also known to have potential anti-proliferativeactivities but its instability, poor aqueous solubility, andlack of relevant studies have limited its application as aneffective anti-cancer drug. To overcome these problems,ART was loaded in poly (lactic-co-glycolic) acid (PLGA)nanoparticles using oil/water emulsion evaporationmethod. PLGA nanoparticles with small particle size andhigh entrapment efficiency were obtained. The PLGAnanoparticles were optimized by evaluating the effects ofseveral formulation parameters on physicochemical propertiesof nanoparticles. The in vitro cytotoxicity of blankPLGA, free ART, and ART-PLGA on 3 human cancer celllines viz. A549, SCC-7, and MCF-7 was conducted usingMTT assay. The particles showed nanometric size(*170 nm), large entrapment efficiency (up to 83.4 %),and excellent stability (evaluated for 1 month) afterlyophilization with 5 % mannitol. ART was dispersedinside particle core allowing a sustained release up to 48 h. The in vitro cytotoxicity results demonstrated strongactivity of ART against cancer cell lines. The ART-PLGAformulation significantly reduced cell viability than the freeART. The formulation of ART loaded PLGA nanoparticlessupported a potential application of ART as an anticancer agent.