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Journal of Nanoscience and Nanotechnology

P V Yezhov, J T Kim
We present a development of the method of synthesized phase objects (SPO-method) (P. V. Yezhov, et al. Opt. Exp. 20, 29854 (2012)) for the phase-only rotation invariant pattern recognition. It has been performed a comparison of correlation signals for a set of amplitude objects under their rotation by using the standard and SPO methods, by applying the Fourier-Mellin transformation. The results of both calculation and optical experiments carried out using an optical-digital correlator with SLM in the Fourier plane have been presented...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Sang Chul Jung, Young-Kwon Park, Hyuk Ryeol Park, Ung Il Kang, Ho-Young Jung, Wang Geun Shim, Sang Chai Kim
Catalytic combustion of benzene, toluene, and hexane (BTH) was carried out to investigate in this study the effect of palladium precursor on the property and performance of 1 wt.% Pd/ γ -Al₂O₃. Properties were characterized by X-ray diffraction (XRD), Brunauer Emmett Teller (BET) surface area, temperature programmed reduction (TPR), Transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analyses. When palladium precursor was used to prepare the catalyst, it had a great effect on the property and performance of the supported palladium catalyst...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Seong-Soo Hong
Pure and lead-doped SrTiO₃ perovskite type oxides were successfully synthesized by sol-gel method and characterized by XRD, SEM and DRS. From the results of XRD, the metal replacement with the Pb ion on the crystal lattice does not change the high crystallinity of the perovskite structure. UV-vis DRS analysis shows that Pb was in situ doped in the lattice of SrTiO₃ and the absorption band shifted to a higher wavelength on the Pb-doped SrTiO₃ sample compared to the pure SrTiO₃ sample. We also investigated the photocatalytic activity of Pb-doped SrTiO₃ for the decomposition of Rhodamine B under visible light irradiation...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Seungmin Lee, Seokhwan Son, Wonbong Kwak, Sunghun Jung, Hogeun Ahn, Minchul Chung
Styrenated phenol alkoxylates (SP-A) are prepared from styrenated phenols (SP) and ethylene oxide (EO) under a homogeneous base catalyst. However, to use EO that is difficult to handle, a high-pressure reaction device capable of reaction process control should be used. Additionally, the homogeneous base catalyst requires a neutralization process to remove the remaining catalyst after the reaction, and it is difficult to separate the catalysts and the product. Therefore, in this study, the separation of product and catalyst by using KOH/La₂O₃ catalyst was facilitated in the production of SP-A...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Yongchul Kwon, Minchul Chung, Kwak Wonbong, Sunghun Jung, Ho-Geun Ahn
Styrenated phenols (SPs) are usually synthesized by the reaction of styrene and phenol under acid catalysts. SPs with a high content of di-styrenated phenol (DSP) can be used to prepare styrenated phenol alkoxylate (SP-A). Therefore, in this study, a scale-up process for synthesizing SPs with high DSP content which can be used for synthesis of SP-A was studied. The solid catalyst used in this study was prepared by impregnation method. SO2- ₄ was impregnated on a SO2- ₄/ZrO₂ catalyst in an aqueous 1 M H₂SO₄ solution...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Long Giang Bach, Trinh Duy Nguyen, Nguyen Thi Thuong, Ho Thi Thanh Van, Kwon Taek Lim
Glutathione (GSH) functionalized CdSe quantum dots (QDs) (GSH- f -CdSe QDs) were prepared via a simple one-pot strategy at low temperature. The as-synthesized CdSe QDs were characterized by FT-IR and XPS analyses. The morphology, physical structure and size distribution of GSH- f -CdSe QDs were investigated by TEM, XRD and DLS analyses, respectively. The GSH- f -CdSe QDs exhibited excellent stability of optical properties as investigated by UV-Vis absorption and photoluminescence (PL) spectroscopy. The high affinity of GSH towards heavy metal ions made the GSH- f -CdSe QDs quite susceptible to Pb2+ ion which poses serious threat to the health and environment...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Yeong-Seo Do, Kwan Hyung Cho, Hee-Cheol Kim, Jun Young Kwon, Sung Tae Kim, Sang Yeob Park, Young-Hwan Kim, Joo-Eun Kim, Young-Joon Park, Han-Joo Maeng, Dong-Jin Jang
The aim of this study is to develop an effective delivery system (silica microparticles) encapsulating volatile essential oil (EO) by multiple emulsification process and sol-gel method. Depending on critical materials (Pluronic P123 and HPC) and process parameter (drying temperature), silica microparticles were prepared and evaluated. As results, the amount of EO inside microparticles increased in polymer-dependent manners. On the other hand, the amount of EO was reduced as drying temperature increased. Based on these data, the condition fabricating silica microparticles was optimized: drying temperature (25 °C), Pluronic P123 (1...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Hye-In Kim, Jun-Pil Jee, Sung Tae Kim, Dongjin Kang, Yu Chul Kim, Hee-Cheol Kim, Sang Yeob Park, Hwa-Mi Lee, Kwan Hyung Cho, Dae-Young Kim, Sung-Up Choi, Dong-Jin Jang
The aim of this study is to develop nanosuspension for improved dissolution of poorly water-soluble celecoxib. We first prepared coarse suspension of celecoxib with Tween 80 and hydroxypropyl methylcellulose as stabilizers, and then fabricated nanosuspension using the bead milling technique. Depending on milling time, the physical properties of nanosuspension were evaluated by photon correlation spectroscopy (e.g., particle size and distribution) and scanning electron microscopy (SEM) (e.g., morphology). As results, the mean size of crystalline celecoxib particles was highly reduced (368...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Chungwook Chung, Kyudon Chung, Do Young Kim, Sun Hee Lee, Jong-Sik Kim, Young Ha Rhee
Monoacrylate-poly(ethylene glycol) grafted poly(3-hydroxyoctanoate) (PEGMA- g -PHO) copolymer was obtained by UV irradiation and ibuprofen (IBU) loaded nanoparticles with PHO or PEGMA- g -PHO polymers were successfully prepared by a single emulsion process. Size of IBU-loaded nanoparticles was about 300 nm based on particle size measurement. Their shapes were spherical. To study drug release properties, IBU release from nanoparticles were performed with FBS buffer. Higher burst release of IBU was observed with the highest graft density of PEGMA groups and 100% drug release was found in 3, 6, and 12 days for PHO, PEGMA- g -PHO0...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Dal-Seong Gong, Si-Won Kang, Kushal Sharma, Dong-Wook Kim, Min-Ho Oak
Endothelium dysfunction is a hallmark of cardiovascular disease (CVD) and is characterized by loss of homeostasis. Nitric oxide deprivation, unbalanced production of vasoactive factors such as thromboxane, endothelium-derived hyperpolarizing factor (EDHF) and production of reactive oxygen species are known as early indicators of CVD. Bioavailability of nitric oxide, antioxidative activity, and regulation of ionic homeostasis are the key targets for prevention of CVD. In this study, we investigated the vasorelaxant action of Nelumbo nucifera extract as well as the underlying mechanism using porcine coronary artery...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Kyong-Hwan Chung, Hangun Kim, Young-Kwon Park, Byung-Hoon Kim, Sun-Jae Kim, Sang-Chul Jung
The estrogenicity of decyl glucoside was asserted as a non-endocrine disruptive surfactant with its preparation method using zeolite catalysts. Its estrogenicity was estimated using E-assay method. The decyl glucoside was synthesized by direct glucosidation from D-glucose with 1-decanol. The conversion and yield were improved with increasing of amount of acid sites of the zeolite catalysts. The decyl glucopyranoside is more hydrophilic than nonylphenol and has a high wettability. The decyl glucopyranosides exhibited extremely lower proliferation of estrogenic cell compared with nonylphenol...
February 1, 2019: Journal of Nanoscience and Nanotechnology
So-Yeon Park, Yi Yang, Rui Zhou, Sang-Chul Jung, Woo Kyun Bae, Ik Joo Chung, Kyung Keun Kim, Hangun Kim
ErbB4/KITENIN signaling plays a role in epidermal growth factor receptor (EGFR)-independent EGF pathways mediating the invasiveness and tumorigenesis of colorectal cancer cells. However, whether alterations in ErbB4/KITENIN signaling play a role in the resistance to anti-EGFR therapy remains unclear. Here, we established cetuximab-resistant DLD1 and HT29 cells, and analyzed changes in ErbB4/KITENIN signaling. c-Jun, a final effector in ErbB4/KITENIN-mediated signaling, was upregulated, whereas KITENIN levels remained constant in both cetuximab-resistant cell lines...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Daejun Oh, Eun-Bum Cho, In-Gu Lee, Young-Kwon Park
Lignocellulosic biomass, principally consisting of cellulose, hemicellulose and lignin, is a main renewable source for the production of biofuels and valuable chemicals. For instance, the polyaromatic structure of lignin fraction of biomass makes it a high potential feedstock for the production of valuable aromatic chemicals such as phenolic compounds. In this work, selective conversion of the organosolv lignin-derived pyrolyzates to alkylphenols was carried out using Ce-MCM-41 as In-Situ catalyst. Catalytic fast pyrolysis of the organosolv lignin was carried out on a tandem micro-pyrolyzer coupled with gas chromatography and mass spectrometry (GC-MS) detectors...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Young-Kwon Park, Heejin Lee, Young-Min Kim
Catalytic hydrodeoxygenation (HDO) of cork oak pyrolysis oil was performed using a high pressure batch type reactor. Cork oak pyrolysis oil, obtained from the fast pyrolysis of cork oak, was upgraded into high quality oil under HDO conditions (260 °C, 80 bar) over 20 wt.% Ni/Al-MCM-41. Compared to the cork oak pyrolysis oil, HDO oil had a smaller oxygen content, increased heating value, and improved viscosity and acidity due to the high contents of esters and hydrocarbons.
February 1, 2019: Journal of Nanoscience and Nanotechnology
Eun-Sik Kim, Sharifuzzamanm Md, Seong-Gyu Seo, In-Won Kang, Hyung-Sun Yoon
Fluoride is important to aquatic environment and health aspects, and the optimal fluoride concentration in water is below 1 mg/L. In this study, the micro-nano bubble pretreatment was applied to remove fluoride ions in the water phase. The pH control by calcium hydroxide (Ca(OH)₂), and coagulation processes with poly aluminum chloride (PAC), aluminum sulfate (Alum), F900 and two kinds of polymer named as A-polymer and A430P polymer were applied for the pretreated wastewater. In results, the combination of PAC and A430P polymer with micro-nano bubble pretreated wastewater showed a higher fluoride removal than the case of other combinations...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Jin Chul Joo, Ga Young Kim, Chang Hyuk Ahn, Saeromi Lee, Jae-Roh Park, Jong Kyu Kim, Jong-Min Oh
A new immobilization technique of nanoscale TiO₂ powders to expanded polystryrene (EPS) balls with temperature-controlled melting method was validated for mass production, and the photocatalytic activity of TiO₂ powder-embedded EPS (TiEPS) balls using methylene blue (MB) solution with different concentrations under ultraviolet irradiation and under the natural solar light irradiation. Whereas MB molecules were weakly adsorbed onto the surface of both TiO₂ powders and supporting polymers without any specific interactions, the photocatalytic efficiency of TiEPS balls with UV ( K app =0...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Vinh Huu Nguyen, Long Giang Bach, Sy Trung Do, Nguyen Thi Thuong, Trinh Duy Nguyen
We report the facial synthesis of Eu-doped MIL-53(Fe) elongated hexagonal dipyramid by solvothermal reaction of Fe(NO₃)₃, Eu(NO₃)₃ and terephthalic acid (TPA) in the presence of N , N -dimethylformamide (DMF). The as-synthesized samples were characterized by XRD, Raman, FT-IR, PL, and SEM. From XRD and Raman results, metal replacement (Eu) with the metal ion (Fe) in the crystal lattice may change the high crystallinity of the MIL-53(Fe) structure, and all the metal ions were incorporated into the structures of MIL-53(Fe) as well as replaced Fe ion or located at interstitial site...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Wen Jun Wang, Yu Pan, Yu Han Zhu, Ling Li, Xiao Guang Liu, Hyeon Mi Noh, Jung Hyun Jeong
The low concentration of Eu3+ doped Sr₂CeO₄ phosphors has been widely studied in recent years and in this paper, we researched the properties of high concentration Eu3+ doped in Sr₂CeO₄. The Sr₂Ce(1- x ) Eu4- x /2 ( x = 0, 1%, 10%, 20%) phosphors were obtained by traditional solid-state reaction. Photoluminescence (PL) spectra are characterized the property of samples. PL spectra illustrate that the concentration of Eu3+ increased, the intensity of 5 D0 -7 F1 , 5 D0 -7 F₂ increased and intensity of Sr₂CeO₄ host emission intensity was decreased...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Yeonhee Sim, Hayoon Lee, Hyocheol Jung, Seokwoo Kang, Jongwook Park
White OLED (WOLED) devices were fabricated using blue emitting materials, TP-AA-TP, TP-AA-TPB, and TPB-AA-TPB, and yellow emitting material polyphenylenevinylene derivative (PDY 132). Three devices were fabricated with the following structure: ITO/PEDOT:PSS (50 nm)/PDY-132 (40 nm)/NPB (10 nm)/Blue EML (30 nm)/Alq₃ (20 nm)/LiF (1 nm)/Al (200 nm). PDY-132 was used by spin coating, and then three blue fluorescent materials were used by vapor deposition to form a white light emitting device. The color coordinates of WOLED using TP-AA-TP, TP-AA-TPB and TPB-AA-TPB were (0...
February 1, 2019: Journal of Nanoscience and Nanotechnology
Jong Kyu Kim, Jung Joong Kim, Jin Chul Joo
Nano MgFe-TiO₂ photocatalyst was prepared by mixing nanoscale spinel compounds such as magnesium ferrite (MgFe) and TiO₂. The cations produced by MgFe are affected by various influencing factors such as calcination temperature, precursor, and mass ratio of Mg and Fe. This study is to evaluate the photocatalytic efficiency of nano MgFe-doped TiO₂ under visible light according to the composition ratio of Mg, Fe and TiO₂. With an increase the percentage of doping (i.e., Mg and Fe) over TiO₂, the band gap between conduction band and valance band decreases, therefore showing better photocatalytic activity in visible light...
February 1, 2019: Journal of Nanoscience and Nanotechnology
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