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 : Zia Ullah Arif (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Ionic liquids based fluorination of organic compounds using electrochemical method
Zia Ul Haq Khan,Yongmei Chen,Dondan Kong,Nawshad Muhammad,Arif Ullah Khan,Faheem Ullah Khan,Kamran Tahir,Aftab Ahmad,Lei Wang,Pingyu Wan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.31 No.-
Ionic liquids due to their advantageous properties gain importance in many fields. This study aims tooverview the use of ionic liquids in the selective partial fluorination of organic compounds throughelectrochemical method. In addition to ionic liquid based fluorination, the earlier approaches offluorination through an electrochemical process have also been highlighted. The factors such aselectrode materials (Pt, Ni, and C), types of solvents (CH3CN, DMC, THF, DME, Sulfone, etc.) and type ofelectrolytes (Et3N 3HF, Et3NF 3HF, py HF, etc.) which affect the electrochemical fluorination of organiccompounds have been reviewed. For electrode preparation, the carbon, platinum and nickel wereconsidered suitable materials to be used as an electrode. In CH3CN media, Et3N 3HF and Et4NF 3HFshowed better efficiency during fluorination of organic compounds. Solvent play an important role inelectrochemical fluorination of organic compounds, with the change of solvent the percentage yield ishighly affected. Py-HF is a convenient solvent-supporting electrolyte medium with a reasonably goodconductivity. The electrolyte containing solvents have some side effects on electrochemical fluorinationof organic compounds as observed in cyclic voltammetric analysis. Therefore electrochemicalfluorination to organic compounds without the use of solvent gained more importance. The ionicliquids have been reported for its dual properties, as solvent as well as a fluorinating agent for organiccompounds in electrochemical processes. It has been concluded that solvents free electrochemicalfluorination of organic compounds gives good results as compare to solvent based. Ionic liquids due tomore oxidative stability were noted to have considerable effect on the yield and selectivity of organiccompound fluorination.
-
Muhammad Yasir Khalid,Zia Ullah Arif,Ans Al Rashid 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.5
Green composites can reduce the use of synthetic fibers in many applications. The motivation behind the fabrication of green composites is their excellent biodegradability and recyclability. However, fundamental issues related to green composites are their inferior mechanical properties and the reinforcement’s hydrophilic nature. This paper presents the hand layup technique to produce green composites containing different ratios of synthetic fiber (E-glass) and natural fiber (Jute). The mechanical properties were characterized as per ASTM standards. The impact strength was also investigated for different impact energies. In addition to this, the numerical simulations using ABAQUS were performed. The experimental results for tensile and flexural results were compared and validated with finite element analysis (FEA) results. An error of nearly 4% was observed between the numerical and experimental results. The microscopic analysis of fractured tensile specimens indicated that more pull out of jute fabric in high jute weight percentage composites was the leading cause of its lower tensile strength.
-
Muhammad Yasir Khalid,Ans Al Rashid,Zulkarnain Abbas,Naveed Akram,Zia Ullah Arif,Fausto Pedro Garcia Marquez 한국고분자학회 2021 폴리머 Vol.45 No.3
The improvement in mechanical properties of biodegradable and sustainable materials like natural fibers turns out to be exceptionally appealing from the financial and biological perspectives. This is achieved by hybridization technique in which different fiber orientations can be adjusted in various arrangements providing variety in its properties. In this study, the authors used different natural fibers in hybridization with glass fibers. The tensile strength of varying glass/sisal and glass/jute contents within the composites were compared. Besides, the effect of hybridization was analyzed. Results revealed that all hybrid composites show low tensile strength as compared to the non-hybrid composites. However, in hybrid composites, the laminate containing a single layer of sisal fiber has shown almost the same tensile strength as non-hybrid composites. Based on results, it is suggested that flax is an appropriate natural fiber to replace E-glass for applications requiring similar strength.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
