排序方式: 共有7条查询结果,搜索用时 15 毫秒
1
1.
Dr. Raheela Naz Prof. Qinglei Liu Dr. Waseem Abbas Dr. Muhammad Imtiaz Dr. Imran Zada Dr. Javed Ahmad Dr. Tengfei Li Prof. Jiajun Gu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(70):16054-16062
A new ternary composite of 1T-molybdenum disulfide, hexagonal tungsten trioxide, and reduced graphene oxide (M-W-rGO) is synthesized by using a one-pot hydrothermal process. The synergetic effect of 1T-MoS2 and hexa-WO3 nanoflowers improves the electrochemical performance for supercapacitors by inducing additional active sites and hexagonal tunnels, respectively, which lead to high storage capacity and easy transfer of electrolyte ions. The ternary M-W-rGO composite has a high specific capacitance of 836 F g−1 at 1 A g−1, which is nearly twice that of binary composites of M-rGO and W-rGO with high capacitance retention of 86.35 % after 3000 cycles at a high current density of 5 A g−1. This study provides a new ternary composite that can be used as an electrode material for high-performance supercapacitors. 相似文献
2.
Bradley S Camm KD Liu X McGowan PC Mumtaz R Oughton KA Podesta TJ Thornton-Pett M 《Inorganic chemistry》2002,41(4):715-726
Having isolated and characterized a series of sodium cyclopentadienide salts, we have synthesized a number of 1,1'-bis-amino-functionalized ferrocenes, 1,1'-bis-amino-functionalized ferrocene salts, and 1,1'-bis-amino-functionalized ferrocenium salts. Among these are the first crystallographically characterized examples of cyclopentadienyl units containing (piperidin-N-ylethyl)- and (pyrid-2-ylmethyl)cyclopentadienyl side chains. In the cases of some of the ferrocenes, ferrocene salts, and ferrocenium salts, there are some interesting structural features in the solid state. These include C-H...N and C-H...pi cloud interactions as well as N-H...O and N-H...F hydrogen bonds. 相似文献
3.
Raheela Jabeen Ghulam Mustafa Zain ul Abdin M. Javid Iqbal Amer Jamil 《Applied biochemistry and biotechnology》2014,174(2):657-666
Plants are under constant assault by biotic and abiotic agents. When an elicitor is prologued, an immense reprogramming of plant gene expression and defense responses are initiated, which could be a natural source for potential drug development and insertional mutagenesis. In this regard, differential expression analysis of a medicinal plant Moringa oleifera was performed for bioactive genes at seedling stage, using differential display-RT-PCR technique. Infected seedlings with a fungus Fusarium solani collected at different time intervals, showed a massive change in their gene expression profile. The data analysis revealed that at least 150 pathogen-induced and about 60 suppressed genes were differentially expressed at 8-h postinoculation of the biotic stress. Fifty-five selective genes were disunited and reamplified. Sequence analysis of these potential genes illustrated that these genes had properties of some induced peroxidase mRNA, cell proliferation, others were mitogen activated protein kinases, ribosomal protein genes, defense regulating genes, and a few also had structural properties. Further studies about the utility of these genes in plant metabolism could assist to develop improved transgenic breeds with enhanced value of infection tolerance not only of M. oleifera but of other cultivars also. 相似文献
4.
Javed MR Rashid MH Nadeem H Riaz M Perveen R 《Applied biochemistry and biotechnology》2009,157(3):483-497
Monomeric extracellular endoglucanase (25 kDa) of transgenic koji (Aspergillus oryzae cmc-1) produced under submerged growth condition (7.5 U mg−1 protein) was purified to homogeneity level by ammonium sulfate precipitation and various column chromatography on fast protein
liquid chromatography system. Activation energy for carboxymethylcellulose (CMC) hydrolysis was 3.32 kJ mol−1 at optimum temperature (55 °C), and its temperature quotient (Q
10) was 1.0. The enzyme was stable over a pH range of 4.1–5.3 and gave maximum activity at pH 4.4. V
max for CMC hydrolysis was 854 U mg−1 protein and K
m was 20 mg CMC ml−1. The turnover (k
cat) was 356 s−1. The pK
a1 and pK
a2 of ionisable groups of active site controlling V
max were 3.9 and 6.25, respectively. Thermodynamic parameters for CMC hydrolysis were as follows: ΔH* = 0.59 kJ mol−1, ΔG* = 64.57 kJ mol−1 and ΔS* = −195.05 J mol−1 K−1, respectively. Activation energy for irreversible inactivation ‘E
a(d)’ of the endoglucanase was 378 kJ mol−1, whereas enthalpy (ΔH*), Gibbs free energy (ΔG*) and entropy (ΔS*) of activation at 44 °C were 375.36 kJ mol−1, 111.36 kJ mol−1 and 833.06 J mol−1 K−1, respectively. 相似文献
5.
Dr. Tengfei Li Dr. Lulu Yao Prof. Qinglei Liu Prof. Jiajun Gu Dr. Ruichun Luo Dr. Jinghan Li Dr. Xudong Yan Dr. Weiqiang Wang Prof. Pan Liu Prof. Bin Chen Prof. Wang Zhang Dr. Waseem Abbas Dr. Raheela Naz Prof. Di Zhang 《Angewandte Chemie (International ed. in English)》2018,57(21):6115-6119
MXenes, 2D compounds generated from layered bulk materials, have attracted significant attention in energy‐related fields. However, most syntheses involve HF, which is highly corrosive and harmful to lithium‐ion battery and supercapacitor performance. Here an alkali‐assisted hydrothermal method is used to prepare a MXene Ti3C2Tx (T=OH, O). This route is inspired from a Bayer process used in bauxite refining. The process is free of fluorine and yields multilayer Ti3C2Tx with ca. 92 wt % in purity (using 27.5 m NaOH, 270 °C). Without the F terminations, the resulting Ti3C2Tx film electrode (ca. 52 μm in thickness, ca. 1.63 g cm?3 in density) is 314 F g?1 via gravimetric capacitance at 2 mV s?1 in 1 m H2SO4. This surpasses (by ca. 214 %) that of the multilayer Ti3C2Tx prepared via HF treatments. This fluorine‐free method also provides an alkali‐etching strategy for exploring new MXenes for which the interlayer amphoteric/acidic atoms from the pristine MAX phase must be removed. 相似文献
6.
Muhammad Akram Hafiza Raheela Younas 《Journal of Applied Mathematics and Computing》2017,53(1-2):365-382
The notion of an m-polar fuzzy set is a generalization of a bipolar fuzzy set. We apply the concept of m-polar fuzzy sets to graphs. We introduce certain types of irregular m-polar fuzzy graphs and investigate some of their properties. We describe the concepts of types of irregular m-polar fuzzy graphs with several examples. We also present applications of m-polar fuzzy graphs in decision making and social network as examples. 相似文献
7.
Shafi Sameera Rasheed Tahir Naz Raheela Majeed Saadat Bilal Muhammad 《Journal of Sol-Gel Science and Technology》2021,98(3):478-486
Journal of Sol-Gel Science and Technology - Aerogel technologies provide high-performance lightweight materials with unique textural characteristics such as high specific surface area and open... 相似文献
1