http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Thanh Son Cu,Ngoc Quyen Tran,Van Du Cao,Cuu Khoa Nguyen 한국고분자학회 2014 Macromolecular Research Vol.22 No.4
In this paper, we report the preparation and stabilization of colloidal silver nanoparticle solution, with theassistance of chitosan dihydroxyphenyl acetamide (CDHPA), or oligochitosan dihydroxyphenyl acetamide (OCDHPA). The structure of the chitosan derivatives were characterized by nuclear magnetic resonance (1H NMR) spectroscopy. The morphology of the synthesized silver core-chitosan shell nanoparticles were observed by transmission electronmicroscopy (TEM) and X-ray diffraction (XRD) techniques, and showed a well-defined core-shell structure of polymer-coated silver nanoparticles (AgNPs). The core-shell NPs exhibited a strong antibacterial activity against E. coliand S. aureus, at a very low concentration of AgNPs (2.5 ppm). Our studies offer a new method for the preparationand protection of silver nanoparticles for antibacterial applications.
Thanh Son Vo,Srivathsava Surabhi,Chi Hieu Luong,윤순길,이경동,박병국,정종율 한국물리학회 2015 Current Applied Physics Vol.15 No.7
In this study, we have systematically investigated a magnetic resonance absorption and tunability of absorption wavelength in isolated metal-insulator-metal (MIM) nanodot arrays with transmission geometry. The elemental electromagnetic resonances and their hybridizations are studied using 3- dimensional finite-difference time-domain (FDTD) calculation and resonance properties including the resonance peak tunability, magnetic permeability and quality (Q) factor are characterized with respect to the coupling strength. We have found the existence of electric and magnetic resonance mode in the MIM (Au/MgF2/Au) structure and the magnetic resonance has larger wavelength tunability than the electric resonance. The absorption cross section calculation revealed that absorption is the dominant extinction process at the magnetic resonance only. Magnetic permeability (m) calculations for the various MIM parameters showed the maximum value of the imaginary part of μ is 16.1 with Q factor of 9.2 when the size of nanodot is 200 nm and the inter-dot distance is 300 nm. The presented calculations can be used to tune the response of the magnetic resonance absorption with a variable resonance wavelength and Q factor by using the simple MIM structures with transmission geometry.
Synthesis of oxime from a renewable resource for metal extraction
Anh Son Hoang,Thi Huong Tran,Hong Nhung Nguyen,Hong Son Vu,Thanh Phong Vo,Chi Phan,Thanh Vinh Nguyen 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.8
A new method for semi-synthesis of alkyl salicylaldoximes from cardanol is reported. Cardanol was extracted from decarboxylation process of cashew nutshell liquid, an abundant agricultural by-product. Molecular structures, physical and chemical properties of cardanol and oxime derivatives were confirmed by spectroscopic analyses. The produced oximes were successfully employed to extract copper(II) cation from aqueous copper salt solutions, offering a practical and economical pathway to effectively recover metals using agricultural by-products.
Platinum-catalyzed double silylations of alkynes with bis(dichlorosilyl)methanes
Phan, Son Thanh,Lim, Weon Cheol,Han, Joon Soo,Jung, Il Nam,Yoo, Bok Ryul Elsevier 2006 Journal of organometallic chemistry Vol.691 No.4
<P><B>Graphical abstract</B></P><P>Reaction of alkynes such as ethene (<B>2a</B>), phenylethene (<B>2b</B>); 1,2-diphenylethene (<B>2c</B>) with bis(dichlorosilyl)methanes RCH(SiHCl<SUB>2</SUB>)<SUB>2</SUB>: R=H (<B>1a</B>), SiMe<SUB><I>n</I></SUB>Cl<SUB>3−<I>n</I></SUB>: <I>n</I>=0 (<B>1b</B>), 1 (<B>1c</B>), 2 (<B>1d</B>), 3 (<B>1e</B>) in the presence of Speier’s catalyst gave one of two type products of 1,3-disilacyclopentanes <B>3</B> and 1,3-disilacyclopent-4-enes <B>4</B>. Reaction of <B>1a</B> with <B>2a</B>–<B>c</B> at 80°C gave compounds <B>3</B> in 33–84% yields. The reaction with <B>2c</B> gave <B>3ac</B> in the highest yield (84%). Reaction of <B>1b</B>–<B>e</B> with <B>2c</B> under the same conditions gave compounds <B>3</B> in 38–98% yields. The yields deceased in following order: <I>n</I>=1>2>3>0. Reactions of <B>1c</B> with simple <B>2a</B> and terminal <B>2b</B> under the same conditions gave <B>4ca</B> and <B>4cb</B> in 91% and 57% yields, respectively, while internal alkyne <B>2c</B> afforded <B>3cc</B> in 98% yield.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>Bis(dichlorosilyl)methanes <B>1</B> undergo the two kind reactions of a double hydrosilylation and a dehydrogenative double silylation with alkynes <B>2</B> such as acetylene and activated phenyl-substituted acetylenes in the presence of Speier’s catalyst to give 1,1,3,3-tetrachloro-1,3-disilacyclopentanes <B>3</B> and 1,1,3,3-tetrachloro-1,3-disilacyclopent-4-enes <B>4</B> as cyclic products, respectively, depending upon the molecular structures of both bis(dichlorosilyl)methanes (<B>1</B>) and alkynes (<B>2</B>). Simple bis(dichlorosilyl)methane (<B>1a</B>) reacted with alkynes [R<SUP>1</SUP>–CC–R<SUP>2</SUP>: R<SUP>1</SUP>=H, R<SUP>2</SUP>=H (<B>2a</B>), Ph (<B>2b</B>); R<SUP>1</SUP>=R<SUP>2</SUP>=Ph (<B>2c</B>)] at 80°C to afford 1,1,3,3-tetrachloro-1,3-disilacyclopentanes <B>3</B> as the double hydrosilylation products in fair to good yields (33–84%). Among these reactions, the reaction with <B>2c</B> gave a <I>trans</I>-4,5-diphenyl-1,1,3,3-tetrachloro-1,3-disilacyclopentane <B>3ac</B> in the highest yield (84%). When a variety of bis(dichlorosilyl)(silyl)methanes [(Me<SUB><I>n</I></SUB>Cl<SUB>3−<I>n</I></SUB>Si)CH(SiHCl<SUB>2</SUB>)<SUB>2</SUB>: <I>n</I>=0 (<B>1b</B>), 1 (<B>1c</B>), 2 (<B>1d</B>), 3 (<B>1e</B>)] were applied in the reaction with alkyne (<B>2c</B>) under the same reaction conditions. The double hydrosilylation products, 2-silyl-1,1,3,3-tetrachloro-1,3-disilacyclopentanes (<B>3</B>), were obtained in fair to excellent yields (38–98%). The yields of compound <B>3</B> deceased as follows: <I>n</I>=1>2>3>0. The reaction of alkynes (<B>2a</B>–<B>c</B>) with <B>1c</B> under the same conditions gave one of two type products of 1,1,3,3-tetrachloro-1,3-disilacyclopentanes <B>3</B> and 1,1,3,3-tetrachloro-1,3-disilacyclopent-4-enes (<B>4</B>): simple alkyne <B>2a</B> and terminal <B>2b</B> gave the latter products <B>4ca</B> and <B>4cb</B> in 91% and 57% yields, respectively, while internal alkyne <B>2c</B> afforded the former cyclic products <B>3cc</B> with <I>trans</I> form between two phenyl groups at the 3- and 4-carbon atoms in 98% yield, respectively. Among platinum compounds such as Speier’s catalyst, PtCl<SUB>2</SUB>(PEt<SUB>3</SUB>)<SUB>2</SUB>, Pt(PPh<SUB>3</SUB>)<SUB>2</SUB>(C<SUB>2</SUB>H<SUB>4</SUB>), Pt(PPh<SUB>3</SUB>)<SUB>4</SUB>, Pt[ViMeSiO]<SUB>4</SUB>, and Pt/C, Speier’s catalyst was the best catalyst for such silylation reactions.</P>