http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Ahmed Alshahrie (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Ahmed Alshahrie,Mohammad Omaish Ansari 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.2
Electrically conductive conducting polymer nanocomposites with carbonaceous materials have attraction the attentionworldwide in resolving the energy crisis for economic reasons, ease of fabrication and easily controllable variable redoxchemical states. In this work, highly conducting polypyrrole/g-C 3 N 4 @graphene (PPy/g-C 3 N 4 @GN) has been fabricatedby polymerizing pyrrole with g-C 3 N 4 along with surfactant para toluene sulfonic acid ( p TSA) and later incorporating itwith GN by hydrothermal methodology to form a macroporous network of p TSA doped PPy/g-C 3 N 4 @GN. Thus preparedPPy/g-C 3 N 4 @GN composite was characterized for the morphological characterizations by scanning electron microscopy,transmission electron microscopy while the structural characterizations were done by X-ray powder diff raction and X-rayphotoelectron spectroscopy. The morphological analysis showed that the PPy and g-C 3 N 4 were well distributed inside theGN sheets thereby forming structures of high porosity. The PPy and g-C 3 N 4 were sandwiched between the sheets of GN andsuch morphology is expected to promote the electron transfer. The PPy/g-C 3 N 4 @GN composite showed high conductivityof 8.8 S/cm and exceptionally high thermal stability in aging thermal conductivity experiments. The high conductivity andstability is attributed to the contribution of following factors i.e. the high stability of g-C 3 N 4 , high conductivity of GN andPPy. Three electrode assembly was used to study the electrochemical supercapacitive characteristics; cyclic voltammetriccurves and galvanostatic charge discharge measurements of PPy/g-C 3 N 4 @GN. The obtained nanocomposite delivered highcapacitance of 260.4 F g −1 at a current load of 1 A g −1 as well as excellent 80% cyclic stability after the continuous 2000charge discharge cycles. The enhanced performance is due the interaction between all the constituents in the present nanocompositesand improved electrical conductivity.
-
Carbon rich fly ash and their nanostructures
Numan Salah,Sami S. Habib,Zishan H. Khan,Ahmed Alshahrie,Adnan Memic,Attieh A. Al-ghamdi 한국탄소학회 2016 Carbon Letters Vol.19 No.-
Carbon rich fly ash was recently reported to have compositions that are ideal for use as a precursor and catalyst for carbon nanotube growth. This fly ash powder is mostly composed of pure carbon, predominantly present as sp2. In this work, the effect of sonication time on the morphology and structural properties of carbon rich fly ash particles is reported. The obtained results show that ultrasound treatment is an effective tool for producing ultrafine particles/fragments with higher porosity, which might be suitable for the adsorption of gasses. Moreover, carbon nanoparticles (CNPs) of this fly ash were produced in parallel using the ball milling technique, and were evaluated as reinforcements for epoxy based composites. These CNPs have almost spherical shapes with particle sizes of around 30 nm. They were found to have strong C=O carbonyl group bonds, which might be generated during the ball milling process. The tensile testing results of a fly ash CNP reinforced epoxy composite showed significant improvements in the mechanical properties, mainly in the stiffness of the polymer. The stiffness value was increased by around 23% of that of neat epoxy. These CNPs with chemically active groups might also be useful for other applications.
-
Ansari, Mohammad Omaish,Kumar, Rajeev,Ansari, Sajid Ali,Ansari, Shahid Pervez,Barakat, M.A.,Alshahrie, Ahmed,Cho, Moo Hwan Elsevier 2017 JOURNAL OF COLLOID AND INTERFACE SCIENCE - Vol.496 No.-
<P><B>Abstract</B></P> <P>Multiwalled carbon nanotube (CNT)-graphene oxide (GO) composite was combined with polyaniline (Pani) using an oxidative polymerisation technique. The resulting Pani@GO-CNT was later doped with para toluene sulphonic acid (<I>p</I>TSA) to generate additional functionality. The functional groups exposed on the GO, Pani and <I>p</I>TSA were expected to impart a high degree of functionality to the <I>p</I>TSA-Pani@GO-CNT composite system. The composite was characterised by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The characterisation results revealed the characteristics of Pani, GO, CNT, and <I>p</I>TSA, and suggested the successful formation of the <I>p</I>TSA-Pani@GO-CNT composite system. The composite was utilised successfully for the adsorptive removal of Cr(IV) and Congo red (CR) dye and the adsorption of both pollutants was found to be strongly dependent on the solution pH, adsorbate concentration, contact time, and reaction temperature. The maximum adsorption of Cr(IV) and CR was observed in an acidic medium at 30°C. The kinetics for Cr(IV) and CR adsorption was studied using pseudo-first order, pseudo-second order, and intraparticle diffusion models. The adsorption equilibrium data were also fitted to the Langmuir and Freundlich isotherm models. The thermodynamic results showed that the adsorption process was exothermic in nature. The present study provides a new methodology for the preparation of a highly functionalised Pani-based nanocomposite system and its potential applications to the adsorptive removal of a multicomponent pollutant system from an aqueous solution.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
-
Asim Jilani,Mohammad Omaish Ansari,Ghani ur Rehman,Muhammad Bilal Shakoor,Syed Zajif Hussain,Mohd Hafiz Dzarfan Othman,Sajid Rashid Ahmad,Mohsin Raza Dustgeer,Ahmed Alshahrie 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
The toxic and carcinogenic organic compounds discharge from industries, contaminate the natural reservoirsof water and air which eventually pose a global threat not only to the aquatic life but also to thehumanity. Herein, ternary nanocomposites of silver-nanoparticle (AgNPs)-decorated on polyaniline(Pani)-wrapped zinc oxide nanorods (AgNPs@Pani/ZnO) were prepared via a facile approach. Thenanocomposite degraded 97.91% phenol with an optimized dosage and concentration of H2O2. Moreover, the apparent rate constant for phenol degradation was 3.69 times higher than for pure ZnOnanorods. The hydrogen production from AgNPs@Pani/ZnO was 1.58 and 2.74 times higher than Pani/ZnO and ZnO, respectively. The enhanced phenol degradation and hydrogen production is attributed tothe transfer of holes to the Pani, from which the electrons were transferred to the conduction band ofZnO and eventually to the conduction band of the AgNPs, where they accelerated the redox reactionsfor rapid photolysis of water and phenol. The concentration of the catalyst dosage affected the rate ofphenol degradation. Further, response surface methodology was also applied in order to design 13 setsof random experiments in which the catalyst dosage and degradation time were varied to predict thephenol degradation.
ScienceON
스콜라연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
