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Frequency and field dependent conductivity of carbon nanotube networks
A.B.Kaiser,K.J.Challis,G.C.McIntosh,G.T.Kim,H.Y.Yu,J.G.Park,S.H.Jhang,Y.W.Park 한국물리학회 2002 Current Applied Physics Vol.2 No.2
The measured resistance of carbon nanotube networks is often dominated by defects, inter-tube and inter-rope contacts. Weshow that the peak reported in the frequency-dependent conductivity of single-wall carbon nanotube networks is consistent withpendence of the conductivity. Using Sheng’s model, we calculate the eld dependence of uctuation-assisted tunnelling conductionbetween metallic regions separated by an insulating barrier, obtaining nonlinearities consistent with our experimental data oncarbon nanotube networks.. 2002 Elsevier Science B.V. All rights reserved.
Variation with temperature of the I-V characteristics of polyacetylene nanofibres
A.B.Kaiser,T.M.Iorns,J.G.Park,B.Kim,S.H.Lee,Y.W.Park 한국물리학회 2002 Current Applied Physics Vol.2 No.4
The currentvoltage (IV) characteristics of individual nanobres of doped polyacetylene show a dramatic change from verystrong nonlinearities for lightly-doped samples at low temperatures, to nearly ohmic behaviour for higher temperatures and dopinglevels. At low temperatures (below 1030 K), theIV characteristics are independent of temperature and follow the expression forZener-type tunnelling, as predicted for eld-induced tunnelling of the conjugated bond system. At higher temperatures, theIVmechanisms become important. TheIV characteristics for the most conductive sample are consistent with our calculations ofuctuation-induced tunnelling.. 2002 Elsevier Science B.V. All rights reserved.
Conduction mechanisms in polyacetylene nanofibres
A. B. Kaiser,Y. W. Park 한국물리학회 2002 Current Applied Physics Vol.2 No.1
The currentvoltage (Ib ) characteristics of individual nanobres of lightly-doped polyacetylene show very strong nonlinearities.At low temperatures theIV characteristics are consistent with Zener-type tunnelling, and independent of temperature and magneticeld. We propose that this behaviour arises from tunnelling of a segment of the conjugated bond system in the presence of an electriceld, in analogy to the soliton-pair creation mechanism proposed by Maki for conduction in charge-density-wave (CDW) materials.temperatures. At higher temperatures theIV characteristics deviate from Zener-type behaviour and are temperature dependent, soother conduction mechanisms are important.. 2002 Elsevier Science B.V. All rights reserved.
Anti-Allergic Effects of Herbal Product from Allium cepa (Bulb)
Kaiser, P.,Youssouf, M.S.,Tasduq, S.A.,Singh, S.,Sharma, S.C.,Singh, G.D.,Gupta, V.K.,Gupta, B.D.,Johri, R.K. The Korean Society of Food Science and Nutrition 2009 Journal of medicinal food Vol.12 No.2
Allium cepa (Family Liliaceae) is a reputed Indian medicinal herb that is prescribed as an effective remedy for several ailments in the Ayurvedic system of medicine. The aim of this study was to evaluate its efficacy against various events responsible for Type I allergic reactions. A herbal fraction (ALC-02) from A. cepa (bulb) inhibited histamine release and attenuated intracellular calcium levels in Compound 48/80-induced rat peritoneal mast cells. It also prevented Compound 48/80-mediated systemic anaphylaxis while lowering histamine levels in plasma. ALC-02 suppressed carrageenan-induced rat paw edema. It inhibited eosinophil peroxidase activity and protein content in broncho alveolar lavage fluid (BALF) of ovalbumin-challenged mice. In this experiment ALC-02 also caused a substantial reduction in lipid peroxidation in BALF/lung tissue and augmented superoxide dismutase activity in lung tissue. ALC-02 suppressed erythrocytic lysis caused by Triton X-100. A significant quenching of 1,1-diphenyl-2-picrylhydrazyl radical by ALC-02 was observed. The results have shown a promising anti-allergic profile of ALC-02 that could be attributed to its potential antihistaminic, anti-inflammatory, and antioxidant activities.
Anti-Allergic Effects of Herbal Product from Allium cepa (Bulb)
P. Kaiser,M.S. Youssouf,S.A. Tasduq,S. Singh,S.C. Sharma,G.D. Singh,V.K. Gupta,B.D. Gupta,R.K. Johri 한국식품영양과학회 2009 Journal of medicinal food Vol.12 No.2
Allium cepa (Family Liliaceae) is a reputed Indian medicinal herb that is prescribed as an effective remedy for several ailments in the Ayurvedic system of medicine. The aim of this study was to evaluate its efficacy against various events responsible for Type I allergic reactions. A herbal fraction (ALC-02) from A. cepa (bulb) inhibited histamine release and attenuated intracellular calcium levels in Compound 48/80-induced rat peritoneal mast cells. It also prevented Compound 48/80-mediated systemic anaphylaxis while lowering histamine levels in plasma. ALC-02 suppressed carrageenan-induced rat paw edema. It inhibited eosinophil peroxidase activity and protein content in bronchoalveolar lavage fluid (BALF) of ovalbumin-challenged mice. In this experiment ALC-02 also caused a substantial reduction in lipid peroxidation in BALF/lung tissue and augmented superoxide dismutase activity in lung tissue. ALC-02 suppressed erythrocytic lysis caused by Triton X-100. A significant quenching of 1,1-diphenyl-2-picrylhydrazyl radical by ALC-02 was observed. The results have shown a promising anti-allergic profile of ALC-02 that could be attributed to its potential antihistaminic, anti-inflammatory, and antioxidant activities.
Novel transport materials for high-performance fluorescent and phosphorescent OLEDs
E. Böhm,R. Anemian,A. Büsing,R. Fortte,H. Heil,J. Kaiser,J. Kröber,S. Leu,T. Mujica-Fernaud,A. Parham,C. Pflumm,F. Voges 한국정보디스플레이학회 2011 Journal of information display Vol.12 No.3
To improve the performance of blue fluorescent and green phosphorescent organic light-emitting diode devices, Merck developed novel green phosphorescent host and electron-transporting materials. The newly developed electron-transporting material improves the external quantum efficiency of blue fluorescent devices up to 8.7%, with an excellent lifetime. In combination with the newly developed host materials, the efficiency of green phosphorescent devices can be improved by a factor of 1.7, and the lifetime by a factor of 7.
Kaiser, A.B.,Park, J.G.,Kim, B.,Lee, S.H.,Park, Y.W. Elsevier 2004 Current Applied Physics Vol.4 No.5
<P><B>Abstract</B></P><P>For a polypyrrole micro-line synthesized with width down to 1.5 μ using a scanning probe microscope, the current–voltage characteristics evolve from ohmic to highly nonlinear as temperature is reduced to 50 K. We show that this nonlinearity agrees with the generic behaviour given by our full calculations for fluctuation-assisted tunnelling and thermal activation, and make a comparison with the behaviour in polypyrrole films and polyacetylene nanofibres.</P>
Thermopower and resistivity of carbon nanotube networks and organic conducting polymers
A. B. Kaiser,S. A. Rogers 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
The resistivities for carbon nanotube networks and highly conducting polymers show similar behaviour, which we ascribe tometallic conduction interrupted by barriers, but the thermopower of the two types of material is very dierent. The almost linear temperature dependence of the thermopower of highly conducting polymers indicates that the electronphonon interaction is toosmall to produce signicant superconductivity. For carbon nanotubes, we identify systematic nonlinearities in the thermopower dataand compare them with calculations of thermopower due to sharp peaks in the density of states and to low-temperature enhancement effects.
Some aspects of conduction in metallic single-wall carbon nanotubes
Goh, S.K.,Kaiser, A.B.,Lee, S.W.,Lee, D.S.,Yu, H.Y.,Park, Y.W. Elsevier 2006 CURRENT APPLIED PHYSICS Vol.6 No.5
<P><B>Abstract</B></P><P>The current–voltage characteristics of several different types of material with partially metallic conductivity show similar nonlinearities. We analyze the current–voltage characteristics and their temperature dependence for metallic single-wall carbon nanotubes (SWNTs) suspended between electrodes and show their consistency with calculations for fluctuation-assisted tunnelling and activated conduction. We also make a comparison with earlier data on the current–voltage characteristics of networks of SWNTs and a SWNT rope.</P>
Polypyrrole micro-line:current-voltage characteristics and comparison with other conducting polymers
A.B.Kaiser,J.G.Park,B.Kim,S.H.Lee,박영우 한국물리학회 2004 Current Applied Physics Vol.4 No.5
For a polypyrrole micro-line synthesized with width down to 1.5l using a scanning probe microscope, the current-voltage characteristics evolve from ohmic to highly nonlinear as temperature is reduced to 50 K. We show that this nonlinearity agrees withthe generic behaviour given by our full calculations for uctuation-assisted tunnelling and thermal activation, and make a com-parison with the behaviour in polypyrrole lms and polyacetylene nanobres.