http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Structural, optical, thermal and electrical studies on PVA/PVP blends filled with lithium bromide
E.M. Abdelrazek,I.S. Elashmawi,A. El-khodary,A. Yassin 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Films of PVA/PVP blend (50/50) filled with different concentrations of LiBr were prepared. The prepared films were investigated by different techniques. XRD scans demonstrate that complexation between the filler and the blend takes place in the amorphous region. UV–VIS analysis revealed that the values of the optical energies are changed with increase Li-ions content. This indicates that there is a charge transfer complexes arise between the polymer blend and Li-ions. The thermal stability of the product samples has improved after filling LiBr increases, this indicates that the filler acts as a plasticizer. The rise of the conductivity is significant with increased concentration of LiBr, this is means the decrease in the degree of crystallinity and increase in the degree of amorphosity. This suggests the choice of LiBr as filler to improve the electrical conductivity of PVA/PVP.
Copper Ion Cementation in Presence of a Magnetic Field
Fadali, Olfat A.,Obaid, Mohamed,Mahmoud, Mohamed S.,Farrag, Taha E.,TaeWoo, Kim,Khalil, Khalil Abdelrazek,Barakat, Nasser A. M. VCH VERLAGSGESELLSCHAFT 2015 CHEMICAL ENGINEERING AND TECHNOLOGY Vol.38 No.3
<P><B>Abstract</B></P><P>The effect of an electromagnetic field (EMF) on the rate of copper(II) cementation from copper sulfate solutions on a rotating iron cylinder was investigated. The studied variables were cylinder rotation speed, magnetic field strength, and magnetic field direction. The application of EMF increased the rate of cementation in both parallel and perpendicular direction of the magnetic field where the latter proved to be more effective. The rate of mass transfer under an EMF was found to be more than doubled. The enhancement of copper recovery in presence of the EMF is due to the induced motion of Fe<SUP>+</SUP><I><SUP>n</SUP></I> in the solution which is limited to a certain range of cylinder rotation speed. The power consumption for cementation of copper could be significantly reduced by utilizing EMF.</P>