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Hong, Eunpyo,Kim, Chansong,Lim, Dong-Hee,Cho, Hyo-Jin,Shin, Chae-Ho Elsevier 2018 Applied Catalysis B Vol.232 No.-
<P><B>Abstract</B></P> <P>Zirconia supports were synthesized via a precipitation method, and the effects of crystalline structure and textural properties of ZrO<SUB>2</SUB> on the methane combustion reaction were investigated using the Pd/ZrO<SUB>2</SUB> catalysts. Upon increasing the digestion temperature, the crystalline structure of ZrO<SUB>2</SUB> was transformed from the mixed phase (monoclinic and tetragonal) to the pure tetragonal phase, and these tetragonal ZrO<SUB>2</SUB> supported Pd catalysts exhibited good hydrothermal stabilities. In addition, the BET surface areas of the tetragonal ZrO<SUB>2</SUB> supports could also be tuned by varying the digestion time and calcination temperature, and the catalysts supported on ZrO<SUB>2</SUB> having lower BET surface areas exhibited enhanced catalytic activities. Therefore, the Pd/ZrO<SUB>2</SUB>(85) catalyst, which had a tetragonal structure in addition to the smallest BET surface area, gave the optimal catalytic performance. This is likely due to larger PdO particles being formed on this ZrO<SUB>2</SUB>(85) support, thereby resulting in a highly reducible PdO species. Finally, variations in reducibility between the monoclinic and the tetragonal supported catalysts were clearly calculated by the density functional theory.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Physicochemical properties of the ZrO<SUB>2</SUB> can be varied depending on aging conditions. </LI> <LI> Tetragonal ZrO<SUB>2</SUB> supported Pd catalysts exhibited the good hydrothermal stability. </LI> <LI> Catalysts supported on ZrO<SUB>2</SUB> with lower surface areas exhibited improved activity. </LI> <LI> Pd/ZrO<SUB>2</SUB>(85) catalyst showed the highest activity and stability on methane combustion. </LI> <LI> DFT study calculated the variation in reducibility depending on crystal phase of ZrO<SUB>2</SUB>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Evaluation of SERS Nanoparticles to Detect Bacillus cereus and Bacillus thuringiensis
Hong, Jeehwa,Qin, Jianwei,Van Kessel, Jo Ann S.,Oh, Mirae,Dhakal, Sagar,Lee, Hoonsoo,Hwang, Chansong,Chan, Diane E.,Kim, Dongho,Cho, Hyunjeong,Kim, Moon S. Korean Society for Agricultural Machinery 2018 바이오시스템공학 Vol.43 No.4
Purpose: This research evaluated five types of nanoparticles to develop a surface-enhanced Raman spectroscopy (SERS) method for the rapid detection of two Bacillus species (Bacillus cereus and Bacillus thuringiensis) that are commonly found on fresh produce, which can cause food poisoning. Methods: Bacterial concentrations were adjusted to a constant turbidity, and a total of $30{\mu}L$ of each Bacillus cell suspension was prepared for each nanoparticle. A point-scan Raman system with laser light source of wavelength 785 nm was used to obtain SERS data. Results: There was no qualitative difference in the SERS data of B. cereus and B. thuringiensis for any of the five nanoparticles. Three gold nanoparticles, stabilized in either citrate buffer or ethanol, showed subtle differences in Raman intensities of two Bacillus species at $877.7cm^{-1}$. Conclusions: Among the three types of nanoparticles, the gold nanoparticles stabilized in citrate buffer showed the lowest standard deviation, followed by gold nanoparticles stabilized in ethanol. This result supports the potential application of gold nanoparticles for SERS-based detection of B. cereus and B. thuringiensis.
Evaluation of SERS Nanoparticles to Detect Bacillus cereus and Bacillus thuringiensis
( Jeehwa Hong ),( Jianwei Qin ),( Jo Ann S. Van Kessel ),( Mirae Oh ),( Sagar Dhakal ),( Hoonsoo Lee ),( Chansong Hwang ),( Diane E. Chan ),( Dongho Kim ),( Hyunjeong Cho ),( Moon S. Kim ) 한국농업기계학회 2018 바이오시스템공학 Vol.43 No.4
Purpose: This research evaluated five types of nanoparticles to develop a surface-enhanced Raman spectroscopy (SERS) method for the rapid detection of two Bacillus species (Bacillus cereus and Bacillus thuringiensis) that are commonly found on fresh produce, which can cause food poisoning. Methods: Bacterial concentrations were adjusted to a constant turbidity, and a total of 30 μL of each Bacillus cell suspension was prepared for each nanoparticle. A point-scan Raman system with laser light source of wavelength 785 nm was used to obtain SERS data. Results: There was no qualitative difference in the SERS data of B. cereus and B. thuringiensis for any of the five nanoparticles. Three gold nanoparticles, stabilized in either citrate buffer or ethanol, showed subtle differences in Raman intensities of two Bacillus species at 877.7 cm-1. Conclusions: Among the three types of nanoparticles, the gold nanoparticles stabilized in citrate buffer showed the lowest standard deviation, followed by gold nanoparticles stabilized in ethanol. This result supports the potential application of gold nanoparticles for SERS-based detection of B. cereus and B. thuringiensis.