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The DACs are also important intermediates in the preparation of new derivertives, and could be made for some functional cellulose derivatives materials with fluorescence property, energy store or chelating function.
Bacterial cellulose (BC) is one good raw material to prepare DAC of excellent mechanical performance [3].
Materials and Methods Preparation of DACs.
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The concentration of PDDA aqueous solution is 1% wt .The attractive force between positively charged PDDA polymer and negatively charged ITO surface leads to the growth of PDDA monolayer through self-organization or association of charge pairs[6].The PDDA-coated surface was washed with deionized water to remove all non-bound materials.
Table 1 Photovoltaic Performance of Inverted OPVs with or without PDDA Type of Devices WF of ITO（eV） Voc(mV) Jsc(mA /cm2) FF PCE(%) Without PDDA 4.78±0.05 0.53 8.43 0.41 1.82 With PDDA 4.45±0.05 0.52 9.34 0.43 2.06 Figure 2 Energy level for the inverted OPV cell As indicated in table1,the work function of ITO with PDDA deposition is decreased by nearly 0.3eV (from 4.78eV to 4.45eV).The energy level of other material of this inverted OPV structure has been measured in previous work .This result suggests that the PDDA layer is physisorbed on the conductor’s surface, which would substantially reduce the WF of such a diverse group of conducting materials.
Both Fermi level and electron affinity can be changed simultaneously if a dipole layer interacts strongly with its adjacent material.
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Analysis of the reasons shows that under the optimum concentration of the explosion,methane almost completely react with oxygen.The rising ambient temperature on the one hand increases the internal energy of molecule,speeds the rate of molecular motion, increases the probability of collision between the molecules and accelerates the rate of explosion reaction;on the other hand,according to the gas state equation,the explosion in the volume container and ambient pressure remains unchanged, as the ambient temperature rises, the reaction will reduce the amount of methane-air mixture within the container material, thus affects the final explosion pressure changes. 3.
Acknowledgements This work was financially supported by the National Natural Science Foundation of China (51274238，51374235) and China Postdoctoral Science Foundation (2013M531940).
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Acknowledgement This material is based upon work supported by the National Science and Technology Major Project “High-Grade CNC Machine Tools and Basic Manufacturing Equipments” (Grant No. 2011ZX04016-021 and No. 2010ZX04014-017) .
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