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A SOLID Fe2O3-GRAPHITE COMPOSITE ELECTRODE FOR pH MEASUREMENT 用于pH测量的固体fe2o3 -石墨复合电极
Scientific World Pub Date : 2015-10-06 DOI: 10.3126/SW.V12I12.13596
S. Srivastava, R. Pradhananga
{"title":"A SOLID Fe2O3-GRAPHITE COMPOSITE ELECTRODE FOR pH MEASUREMENT","authors":"S. Srivastava, R. Pradhananga","doi":"10.3126/SW.V12I12.13596","DOIUrl":"https://doi.org/10.3126/SW.V12I12.13596","url":null,"abstract":"A solid Fe2O3-graphite composite electrode was prepared and investigated for use as a potentiometric pH sensor. The electrode was constructed by mixing iron (III) oxide, oxidized graphite and wax that was put over silver disc onto a polypropylene rod. The response of the electrode was investigated by measuring electrode potential as a function of pH.The effect of composition of the electrode material (Fe2O3 and oxidized graphite ration) on the electrode response was investigated. The electrode with 40% Fe2O3, 30% graphite and 30% wax by mass was found to give the best potentiometric response. This electrode behaves in Nernstian manner with a potentiometric gradient of 56.6±0.4 mV per unit change in pH at 25?C within the working range of pH 2-9.The electrode was also used for the end-point detection in potentiometric acid-base titrations and found to be an excellent electrode for pH-metric titration. The effect of oxidation of electrode on pH response was investigated by dipping electrode in 0.1N KMnO4, 1:1HNO3 and 0.1N Ce4+ solutions for different interval of time. This treatment of the electrode with oxidizing agents increased the standard electrode potential of the electrode however potential gradient per unit change in pH remains unaltered. Low cost, quick response and easy to prepare are the advantages of the iron oxide - graphite composite electrode as a pH sensor. However some metal ions and oxidising agents interfered in the determination of pH using this electrode which is the limitation of using these electrodes. Scientific World, Vol. 12, No. 12, September 2014, page 44-47","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"6 1","pages":"44-47"},"PeriodicalIF":0.0,"publicationDate":"2015-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85372691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
CONDUCTANCE OF SODIUM DODECYLSULFATE IN PRESENCE AND ABSENCE OF Na2SO4 AND ZnSO4 IN AQUEOUS MEDIA AT ROOM TEMPERATURE 室温下十二烷基硫酸钠在水溶液中存在和不存在硫酸钠和硫酸锌时的电导率
Scientific World Pub Date : 2015-10-06 DOI: 10.3126/SW.V12I12.13568
A. Bhattarai, S. Shah, Kuber Limbu
{"title":"CONDUCTANCE OF SODIUM DODECYLSULFATE IN PRESENCE AND ABSENCE OF Na2SO4 AND ZnSO4 IN AQUEOUS MEDIA AT ROOM TEMPERATURE","authors":"A. Bhattarai, S. Shah, Kuber Limbu","doi":"10.3126/SW.V12I12.13568","DOIUrl":"https://doi.org/10.3126/SW.V12I12.13568","url":null,"abstract":"Conductance measurement of sodium dodecylsulfate in the presence and in the absence of Na2SO4 and ZnSO4 in aqueous media was done. The results showed sharp increase in conductance with increase in concentration of sodium dodecylsulfate. Also, the conductance increases with addition of salts. The conductance of sodium dodecylsulfate is found more in the presence of Na2SO4 than ZnSO4 in aqueous media. In the presence of salts, the critical micelle concentration (cmc) value decreases which are explained on the basis of the nature and ion size of the added ion. The graph of conductance versus concentration is used in determining the critical micelle concentration (cmc). Scientific World, Vol. 12, No. 12, September 2014, page 41-43","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"88 8","pages":"41-43"},"PeriodicalIF":0.0,"publicationDate":"2015-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91432782","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
SYNTHESIS OF NANO MATERIALS BY MICROWAVE ASSISTED HYDROTHERMAL METHOD 微波辅助水热法制备纳米材料
Scientific World Pub Date : 2015-10-06 DOI: 10.3126/SW.V12I12.13565
H. Trital, A. Rajbhandari, R. Adhikari, S. Lee
{"title":"SYNTHESIS OF NANO MATERIALS BY MICROWAVE ASSISTED HYDROTHERMAL METHOD","authors":"H. Trital, A. Rajbhandari, R. Adhikari, S. Lee","doi":"10.3126/SW.V12I12.13565","DOIUrl":"https://doi.org/10.3126/SW.V12I12.13565","url":null,"abstract":"Bismuth tungstate nano materials have been successfully synthesized by microwave assisted hydrothermal method. Bismuth nitrate (Bi(NO3)3.5H2O) and sodium tungstate (Na2WO4.2H2O) are used as a starting material for the preparation of nano materials and solution pH was maintained to 3. The prepared material was characterized by X-ray diffraction (XRD) to study the phase state, whereas surface morphology was observed by Scanning Electron Microscopy (SEM). The surface area was determined by Brunauer-Emmett-Teller (BET) method. The results revealed that materials are crystalline in nature having crystallite size of ~ 24 nm with surface area of 6.5 m2/g. SEM image of prepared materials showed a unique discrete hierarchical morphology. The prepared material showed visible light active photocatalytic nature for the decomposition of Rhodamine B. Scientific World, Vol. 12, No. 12, September 2014, page 21-23","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"31 1","pages":"21-23"},"PeriodicalIF":0.0,"publicationDate":"2015-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87887390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
STUDY OF SEGREGATING NATURE IN LIQUID Al-Ga ALLOYS 液态铝镓合金的偏析性质研究
Scientific World Pub Date : 2015-10-06 DOI: 10.3126/SW.V12I12.13564
I. Koirala, B. Singh, I. S. Jha
{"title":"STUDY OF SEGREGATING NATURE IN LIQUID Al-Ga ALLOYS","authors":"I. Koirala, B. Singh, I. S. Jha","doi":"10.3126/SW.V12I12.13564","DOIUrl":"https://doi.org/10.3126/SW.V12I12.13564","url":null,"abstract":"We report energetic of mixing behavior of liquid Al-Ga alloys, using simple statistical theory through concentration dependence thermodynamic, structural, transport and surface properties at 1023K. The concentration dependent thermodynamic functions (free energy of mixing, enthalpy of mixing, entropy of mixing and activity coefficient of the component), structural functions (concentration fluctuation in the long wavelength limit and chemical short range order parameter), transport properties (diffusivity and viscosity) and surface properties (surface segregation and surface tension) have got special attention to show a tendency of homo-coordination of atom in the mixture. The theoretical analysis reveals that input parameter, order energy is temperature dependent and Al-Ga alloys is of weakly interacting system. Scientific World, Vol. 12, No. 12, September 2014, page 14-20","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"112 1","pages":"14-20"},"PeriodicalIF":0.0,"publicationDate":"2015-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78630771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
PSATHYRELLA CANDOLLEANA (FR.:FR.) MAIRE VAR. CANDOLLEANA (FR.) MAIRE: A NEW RECORD OF MUSHROOM FOR NEPAL 紫斑孢(Psathyrella candolleana)Maire变种candolleana(法)Maire:尼泊尔蘑菇新纪录
Scientific World Pub Date : 2015-10-06 DOI: 10.3126/SW.V12I12.13602
M. Adhikari
{"title":"PSATHYRELLA CANDOLLEANA (FR.:FR.) MAIRE VAR. CANDOLLEANA (FR.) MAIRE: A NEW RECORD OF MUSHROOM FOR NEPAL","authors":"M. Adhikari","doi":"10.3126/SW.V12I12.13602","DOIUrl":"https://doi.org/10.3126/SW.V12I12.13602","url":null,"abstract":"Recently Psathyrella candolleana (Fr.:Fr.) Maire var. candolleana (Fr.) Maire (1913) was gathered from Lainchour, Kathmandu. It is considered as new record for Nepal. The brief description, distribution and the photograph of the species has been included in this paper. Scientific World, Vol. 12, No. 12, September 2014, page 77-78","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"15 1","pages":"77-78"},"PeriodicalIF":0.0,"publicationDate":"2015-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84893067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
EFFECT OF STIRRING RATE ON ELECTROCHEMICAL CODEPOSITION OF Ni-SiC COMPOSITE 搅拌速率对Ni-SiC复合材料电化学共沉积的影响
Scientific World Pub Date : 2015-10-06 DOI: 10.3126/SW.V12I12.13567
K. Hamal, A. Rajbhandari, G. Gyawali, S. Lee
{"title":"EFFECT OF STIRRING RATE ON ELECTROCHEMICAL CODEPOSITION OF Ni-SiC COMPOSITE","authors":"K. Hamal, A. Rajbhandari, G. Gyawali, S. Lee","doi":"10.3126/SW.V12I12.13567","DOIUrl":"https://doi.org/10.3126/SW.V12I12.13567","url":null,"abstract":"Nickel-Silicon Carbide ( Ni-SiC) composite has been prepared by electrochemical codeposition technique. Nickel sulfamate bath was used along with grain modifier saccharine and cationic surfactant cetyltrimetylammonium bromide (CTAB). The effect of stirring rate was systematically studied and optimized to get well dispersed SiC particles in appropriate amount. Mixed crystalline phase with reinforced [2 1 1] crystal orientation was obtained by XRD analysis. The result revealed that, 250 revolutions per minute (rpm) is optimum stirring rate for the electrochemical codeposition of Ni–SiC. Coating prepared at 250 rpm showed highest microhardness and lowest coefficient of friction with better surface morphology and well distributed nano SiC particles. Scientific World, Vol. 12, No. 12, September 2014, page 30-33","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"25 1","pages":"30-33"},"PeriodicalIF":0.0,"publicationDate":"2015-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84970983","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Dielectric Studies on Cyclohexanone and 1,4-Dioxane 环己酮和1,4-二恶烷介电性研究
Scientific World Pub Date : 2013-11-11 DOI: 10.3126/SW.V11I11.9138
B. Thapa, P. Shrestha, P. Bhattarai, B. Pokharel
{"title":"Dielectric Studies on Cyclohexanone and 1,4-Dioxane","authors":"B. Thapa, P. Shrestha, P. Bhattarai, B. Pokharel","doi":"10.3126/SW.V11I11.9138","DOIUrl":"https://doi.org/10.3126/SW.V11I11.9138","url":null,"abstract":"","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"33 1","pages":"13-16"},"PeriodicalIF":0.0,"publicationDate":"2013-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86536406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Spectrophotometric Determination of Phosphate in Sugarcane Juice, Fertilizer, Detergent and Water Samples by Molybdenum Blue Method 钼蓝分光光度法测定甘蔗汁、肥料、洗涤剂和水样中的磷酸盐
Scientific World Pub Date : 2013-11-11 DOI: 10.3126/SW.V11I11.9139
S. Pradhan, M. R. Pokhrel
{"title":"Spectrophotometric Determination of Phosphate in Sugarcane Juice, Fertilizer, Detergent and Water Samples by Molybdenum Blue Method","authors":"S. Pradhan, M. R. Pokhrel","doi":"10.3126/SW.V11I11.9139","DOIUrl":"https://doi.org/10.3126/SW.V11I11.9139","url":null,"abstract":"A simple and sensitive spectrophotometric method has been developed for the determination of phosphate in mg per liter (parts per million) concentration range in sugarcane juice, water, fertilizer and detergent samples. The amount of phosphate is determined by molybdenum blue phosphorus method in conjugation with UV-visible spectrophotometer. This method is based on the formation of phosphomolybdate complex with the added molybdate followed by the reduction of the complex with hydrazine hydrate in aqueous sulphuric acid medium. The system obeys Lambert-Beer’s law at 840 nm in the concentration range 0.1-11 ppm. The colour intensity of the reduced phosphomolybdate solution is found to be proportional to the amount of phosphate present in sugarcane juice, water, fertilizer and detergent samples. The reaction conditions as well as the various experimental parameters affecting the development and stability of the coloured complex were carefully investigated and optimized for the quantitative determination of phosphate present in various samples. The optimized concentrations of various reagents used are 0.20N sulphuric acid, 0.02M hydrazine hydrate and 0.20% ammonium molybdate. The effect of time on the formation of phosphomolybdenum blue complex and addition of the order of the reagents was also studied. Scientific World, Vol. 11, No. 11, July 2013, page 58-62 DOI: http://dx.doi.org/10.3126/sw.v11i11.9139","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"14 1","pages":"58-62"},"PeriodicalIF":0.0,"publicationDate":"2013-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87631642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 56
Antibiogram and β-Lactamase Test of Multidrug Resistant Staphylococcus Species 多重耐药葡萄球菌抗菌谱及β-内酰胺酶检测
Scientific World Pub Date : 2013-11-11 DOI: 10.3126/SW.V11I11.9140
C. Shrestha, S. Rajbahak, J. Shrestha, Anjana Singh
{"title":"Antibiogram and β-Lactamase Test of Multidrug Resistant Staphylococcus Species","authors":"C. Shrestha, S. Rajbahak, J. Shrestha, Anjana Singh","doi":"10.3126/SW.V11I11.9140","DOIUrl":"https://doi.org/10.3126/SW.V11I11.9140","url":null,"abstract":"","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"82 1","pages":"70-73"},"PeriodicalIF":0.0,"publicationDate":"2013-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84211742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Traditional Phytotherapy of Some Medicinal Plants Used by Tharu and Magar Communities of Western Nepal, Against Dermatological Disorders 尼泊尔西部Tharu和Magar社区使用的一些药用植物治疗皮肤病的传统植物疗法
Scientific World Pub Date : 2013-09-05 DOI: 10.3126/SW.V11I11.8558
A. Singh, Jaya Prakash Hamal
{"title":"Traditional Phytotherapy of Some Medicinal Plants Used by Tharu and Magar Communities of Western Nepal, Against Dermatological Disorders","authors":"A. Singh, Jaya Prakash Hamal","doi":"10.3126/SW.V11I11.8558","DOIUrl":"https://doi.org/10.3126/SW.V11I11.8558","url":null,"abstract":"Scientific World, Vol. 11, No. 11, July 2013, page 81-89 DOI: http://dx.doi.org/10.3126/sw.v11i11.8558","PeriodicalId":21637,"journal":{"name":"Scientific World","volume":"99 1","pages":"81-89"},"PeriodicalIF":0.0,"publicationDate":"2013-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74633937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
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