Preparation and characterization of the PVDF-based composite membrane for direct methanol fuel cells

. prepare the PVDF composite membrane. The structure and the morphology of the PVDF-SPS composite membrane were characterized. The proton conductivity and the methanol. Foundation. All rights reserved. Preparation and characterization of the PVDF-based composite membrane for direct methanol fuel cells Qian Liu, Laizhou Song,

Ngày tải lên: 05/09/2013, 16:11

... X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses to identify the structure, and the morphology of the samples. Figure 1 shows the XRD result for the TiO 2 film prepared ... o C. The sharp peaks of the XRD pattern indicate that TiO 2 with high crystallinity and high phase purity was formed from the TiCl 4 solution by using thermal hydr...

Ngày tải lên: 13/02/2014, 04:20

... expression of T-bet has been seen within a wide variety of tissues and cells in the Ginbuna crucian carp [27] and, in mammals, in the lung tissue of mouse and spleen and thymus of human and mouse ... stat6,zftbet-F1 and zftbet-R1 for t-bet, and zffoxp3-F1, zffoxp3-R1, zffoxp3-F2 and zffoxp3-R2 for foxp3. These primers amplified part of the initial predicted...

Ngày tải lên: 16/02/2014, 09:20

... 200 mg KBr and 40 mg of the mixture was pelletized. The reproducibility of the spectra was verified on two preparations and the degree of acetylation (DA) was determined using the formula (A 1655 Æcm )1 /A 3450 Æcm )1 ) ... terminate the reaction, the mixture was heated for 5 min followed by the addition of an equal volume of 2 M NaOH and centrifugation (1000...

Ngày tải lên: 19/02/2014, 12:20

... the first hypothesis and therefore a direct involvement of PHI in electron transfer. This conclusion is consistent with the very low degree of identity between the N-terminal sequence of PHI and ... one PHR and one PHO (abc) protomer. The hypothesis of a direct PHI–phenol interaction is quite unlikely, because of the fact that the addition of phenol does not a...

Ngày tải lên: 21/02/2014, 00:20

... composition of the cell wall, DNA organization, synthesis of storage compounds such as glycogen and polyphosphate, and other cellular processes [1,2]. As a result of these changes, the cells become ... site and two flanking unrelated short sequences. The DNA sequen- cing and the deoxyoligonucleotide synthesis were performed by the Scientific Services Department of t...

Ngày tải lên: 22/02/2014, 07:20

... content in their latex; and (2) the pres- ence of other cysteine proteinases or isoforms in the latex. To investigate these two hypotheses, the protein concentration per milligram of dried latex, ... the other sequences. The MP tree reveals three major clusters. Cluster I combines the five chymo- papain isoforms of C. papaya with VXH-C, VS-B, CC-III and CC23. These result...

Ngày tải lên: 07/03/2014, 11:20

... intensive than the others. Thus, the different intensity of the bands may be the result of a different copy number of the genes in the hybridizing fragments. If so, the number of the bands do not ... counter. The quantitative ratio of the amplification products of the three gene variants in the amplified fragment was assessed by calculation of the ratio...

Ngày tải lên: 07/03/2014, 15:20

... experimentally. Indeed, the presence of Arg213 along with the proximity of the charge relay Asp260 within the active site could be responsible for the modification of the catalytic properties of the catalytic histidine. ... efficient nucleophilic attack of the substrate ester bond by the serine alcoholate. The shape of the titration curve of the catalytic...

Ngày tải lên: 07/03/2014, 16:20

... represents the codon for initiation of translation and, therefore, codes for the N-terminus of the protein. This fragment contains a 105-bp fragment of 5¢ untranslated sequence upstream of the putative ... obtained and studied but their analysis showed that they did not contain the central region or the 5¢ end of the gene. The cosmid clone containing the lon...

Ngày tải lên: 08/03/2014, 23:20