Pub Date : 2022-05-12DOI: 10.18311/jsst/2021/28588
Bharatkumar Kanoje, U. Dani, M. Shirdhonkar, J. Parikh, K. Kuperkar
The current study offers a comprehensive understanding on the adsorption study employing the cost-effective biomass as an effective substitute against high-cost treatment options. The present work put forth the adsorption of hazardous cationic dye: Crystal Violet (CV) from aqueous solution using Rice Husk (RH) and surfactant Modified Rice Husk (MRH). Effect of the adsorbents: RH and MRH onto CV removal is determined considering various experimental parameters viz., mass, volume, dye concentration, contact-time, equilibrium temperature, and pH where maximum CV adsorption was achieved at pH = 8. Results obtained are attributed to the favorable ion-pair formation between CV and anionic surfactant: Sodium Dodecyl Sulfate (SDS) which is validated further using quantum chemical calculations. To counterpart the sorption process onto the adsorbent, the adsorption study was validated employing several kinetic models and isotherms. The thermodynamic conduct concluded the CV adsorption to be spontaneous (negative ?G) and endothermic (positive ?H) in characteristic at ambient temperature i.e., adsorption increases with temperature.
{"title":"Dye Adsorption Kinetics and Isotherm Study Using Surfactant-Modified Biomass: Influence of pH Substantiated with Quantum Chemical Validation","authors":"Bharatkumar Kanoje, U. Dani, M. Shirdhonkar, J. Parikh, K. Kuperkar","doi":"10.18311/jsst/2021/28588","DOIUrl":"https://doi.org/10.18311/jsst/2021/28588","url":null,"abstract":"The current study offers a comprehensive understanding on the adsorption study employing the cost-effective biomass as an effective substitute against high-cost treatment options. The present work put forth the adsorption of hazardous cationic dye: Crystal Violet (CV) from aqueous solution using Rice Husk (RH) and surfactant Modified Rice Husk (MRH). Effect of the adsorbents: RH and MRH onto CV removal is determined considering various experimental parameters viz., mass, volume, dye concentration, contact-time, equilibrium temperature, and pH where maximum CV adsorption was achieved at pH = 8. Results obtained are attributed to the favorable ion-pair formation between CV and anionic surfactant: Sodium Dodecyl Sulfate (SDS) which is validated further using quantum chemical calculations. To counterpart the sorption process onto the adsorbent, the adsorption study was validated employing several kinetic models and isotherms. The thermodynamic conduct concluded the CV adsorption to be spontaneous (negative ?G) and endothermic (positive ?H) in characteristic at ambient temperature i.e., adsorption increases with temperature.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45586944","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}
Pub Date : 2021-04-09DOI: 10.18311/JSST/2020/25657
M. Adhikari, A. Thapa
Amaro (Spondias pinnata) seed stone powder was activated using phosphoric acid and carbonized in a muffle furnace at three different temperatures, viz. 300, 400 and 500oC (PAC-300, PAC-400 and PAC-500) to produced Activated Carbons (ACs). Thus, obtained ACs are characterized using Boehm titration, iodine number and scanning electron microscopy (SEM). The observed results attributed that PACs contained irregular sized and shaped particles with well-developed pores, which mostly consisted of carboxyl and phenolic functional groups. Among the ACs, PAC-400 had a highest values of methylene blue number, iodine number and specific surface area, which were 181mg/g, 371.02 mg/g and 582 m2/g, respectively. For the 150 mg/L of methylene blue concentration the adsorption capacity of all the PACs was 100% and the adsorption isotherm followed Langmuir isotherm with Qmax of 256.41 mg/g. Within 2 hours at pH 5, PAC-400 removed as high as 94% of Mn(II) ion from 25 mg/L and up to 40% from 400 mg/L concentration of manganese from an aqueous solution. The adsorption kinetics described pseudo second order kinetics indicating chemisorption. All the results attributed that the phosphoric acid activated amaro seed stone can be used as efficient adsorbent to absorb manganese from an aqueous solution.
{"title":"Mn (II) Adsorption on Activated Carbon Derived from Amaro (Spondias pinnata) Seed Stone","authors":"M. Adhikari, A. Thapa","doi":"10.18311/JSST/2020/25657","DOIUrl":"https://doi.org/10.18311/JSST/2020/25657","url":null,"abstract":"Amaro (Spondias pinnata) seed stone powder was activated using phosphoric acid and carbonized in a muffle furnace at three different temperatures, viz. 300, 400 and 500oC (PAC-300, PAC-400 and PAC-500) to produced Activated Carbons (ACs). Thus, obtained ACs are characterized using Boehm titration, iodine number and scanning electron microscopy (SEM). The observed results attributed that PACs contained irregular sized and shaped particles with well-developed pores, which mostly consisted of carboxyl and phenolic functional groups. Among the ACs, PAC-400 had a highest values of methylene blue number, iodine number and specific surface area, which were 181mg/g, 371.02 mg/g and 582 m2/g, respectively. For the 150 mg/L of methylene blue concentration the adsorption capacity of all the PACs was 100% and the adsorption isotherm followed Langmuir isotherm with Qmax of 256.41 mg/g. Within 2 hours at pH 5, PAC-400 removed as high as 94% of Mn(II) ion from 25 mg/L and up to 40% from 400 mg/L concentration of manganese from an aqueous solution. The adsorption kinetics described pseudo second order kinetics indicating chemisorption. All the results attributed that the phosphoric acid activated amaro seed stone can be used as efficient adsorbent to absorb manganese from an aqueous solution.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48018319","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}
Pub Date : 2021-04-09DOI: 10.18311/JSST/2020/18643
Akshay Chavan, R. Jayaram, S. Bhagwat
This work proposes to tackle the problem of heavy metal contamination of water, using adsorption phenomenon. We have tried to enhance the adsorptive cadmium uptake capacity of activated carbon by modifying its surface with the surfactant - Alpha olefin sulfonate. The effect of contact time and the initial concentration on the adsorption process has been determined. Study of the cadmium uptake by both the unmodified and surfactant modified carbon, with the adsorption data fitted to adsorption isotherms, showed the cadmium uptake capacity of the surfactant modified activated carbon to have enhanced two-fold over the unmodified activated carbon.
{"title":"Cadmium Removal by Adsorption: Enhancement by Surfactant Mediation","authors":"Akshay Chavan, R. Jayaram, S. Bhagwat","doi":"10.18311/JSST/2020/18643","DOIUrl":"https://doi.org/10.18311/JSST/2020/18643","url":null,"abstract":"This work proposes to tackle the problem of heavy metal contamination of water, using adsorption phenomenon. We have tried to enhance the adsorptive cadmium uptake capacity of activated carbon by modifying its surface with the surfactant - Alpha olefin sulfonate. The effect of contact time and the initial concentration on the adsorption process has been determined. Study of the cadmium uptake by both the unmodified and surfactant modified carbon, with the adsorption data fitted to adsorption isotherms, showed the cadmium uptake capacity of the surfactant modified activated carbon to have enhanced two-fold over the unmodified activated carbon.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41858151","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}
Pub Date : 2021-04-09DOI: 10.18311/JSST/2020/24415
Amit G. Shirke, P. Desai, Monika Vashisht, B. Dholakiya, K. Kuperkar
This study illustrates the modification of the Poly-Urethane Foam (PUF) prepared from the Tung Oil (TO) and later impregnating it with varying ratio (~ 1 to 5 w/w%) of Activated Carbon (AC) which enable this modified entity to act as an effective adsorbent for the solvent and oil removal from the water. After its modification, it was found that the PUF impregnated with 5 w/w% AC displayed an enhanced solvent and oil adsorption capacity. The reusability of the adsorbent was observed to decrease with increasing number of cycles. Furthermore, the adsorption conduct was calculated in a batch-type process and validated using equilibrium and kinetics study. Here, the surface-modified PUF sorbent was characterized employing Scanning Electron Microscopy (SEM) and Contact Angle (CA) wettability study. Our findings inferred that with increasing AC ratio in the foam, its pore size and CA increases thereby enhancing the adsorption capacity making this proposed study to be more expedient for sustainable environment safety.
{"title":"Impregnation of Activated Carbon in Polyurethane Foam for Enhanced Solvent and Oil Adsorption from Water","authors":"Amit G. Shirke, P. Desai, Monika Vashisht, B. Dholakiya, K. Kuperkar","doi":"10.18311/JSST/2020/24415","DOIUrl":"https://doi.org/10.18311/JSST/2020/24415","url":null,"abstract":"This study illustrates the modification of the Poly-Urethane Foam (PUF) prepared from the Tung Oil (TO) and later impregnating it with varying ratio (~ 1 to 5 w/w%) of Activated Carbon (AC) which enable this modified entity to act as an effective adsorbent for the solvent and oil removal from the water. After its modification, it was found that the PUF impregnated with 5 w/w% AC displayed an enhanced solvent and oil adsorption capacity. The reusability of the adsorbent was observed to decrease with increasing number of cycles. Furthermore, the adsorption conduct was calculated in a batch-type process and validated using equilibrium and kinetics study. Here, the surface-modified PUF sorbent was characterized employing Scanning Electron Microscopy (SEM) and Contact Angle (CA) wettability study. Our findings inferred that with increasing AC ratio in the foam, its pore size and CA increases thereby enhancing the adsorption capacity making this proposed study to be more expedient for sustainable environment safety.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47492005","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}
Pub Date : 2021-04-09DOI: 10.18311/JSST/2020/24875
R. Parveen, A. Datta, P. Maiti
Polyvinyl Alcohol (PVA) capped Ag nanoparticles (AgNPs) formed through reduction of Silver Nitrate (AgNO3) by Sodium Borohydride (NaBH4) were studied for different PVA concentrations (C, %w/w of solution) in the bulk. Diameter (DAg) of Ag metallic core, obtained from plasmon resonance in Ultraviolet-Visible spectra, had a peak (≈12.8 nm) at C~0.24, which almost exactly matched the gyration sphere diameter of PVA molecule (∼13 nm). Cluster diameter (Dcl), measured after a month through Dynamic Light Scattering (DLS) study, gave the number of NPs per cluster showing a dip at C∼0.24. Minimum inhibitory concentration (MIC) of AgNPs on Escherichia coli (E. coli), assayed from standard broth dilution method (CLSI M07-A8), showed MIC of 0.66 μg/ml at the PVA concentration of 0.24%. Scanning Electron Microscopy (SEM) showed NP clusters accumulating over E. coli to have Dcl ∼ DAg whereas those lying outside the bacteria to have Dcl ∼ 3DAg, consistent with a strong size selectivity of antimicrobial efficacy.
{"title":"Concentration of Capping Agent Controls Size Selection, Agglomeration and Antimicrobial Action of Silver Nanoparticles","authors":"R. Parveen, A. Datta, P. Maiti","doi":"10.18311/JSST/2020/24875","DOIUrl":"https://doi.org/10.18311/JSST/2020/24875","url":null,"abstract":"Polyvinyl Alcohol (PVA) capped Ag nanoparticles (AgNPs) formed through reduction of Silver Nitrate (AgNO3) by Sodium Borohydride (NaBH4) were studied for different PVA concentrations (C, %w/w of solution) in the bulk. Diameter (DAg) of Ag metallic core, obtained from plasmon resonance in Ultraviolet-Visible spectra, had a peak (≈12.8 nm) at C~0.24, which almost exactly matched the gyration sphere diameter of PVA molecule (∼13 nm). Cluster diameter (Dcl), measured after a month through Dynamic Light Scattering (DLS) study, gave the number of NPs per cluster showing a dip at C∼0.24. Minimum inhibitory concentration (MIC) of AgNPs on Escherichia coli (E. coli), assayed from standard broth dilution method (CLSI M07-A8), showed MIC of 0.66 μg/ml at the PVA concentration of 0.24%. Scanning Electron Microscopy (SEM) showed NP clusters accumulating over E. coli to have Dcl ∼ DAg whereas those lying outside the bacteria to have Dcl ∼ 3DAg, consistent with a strong size selectivity of antimicrobial efficacy.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44759004","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}
Pub Date : 2021-04-09DOI: 10.18311/JSST/2020/23534
Mahmoud A. Al-Qudah, Rasha S. Hamaideh, I. Al-Momani, N. Al-Bataineh
Aluminum corrosion inhibition using Capparis decidua extract has been studied. The study was performed in a 1.0 M solution of sodium hydroxide and was monitored both by measuring mass-loss and by using electro-chemical and polarization methods. In addition, surface morphology analysis was performed by applying the technique of Scanning Electron Microscopy (SEM). Results demonstrate effectiveness of Capparis decidua extract as an inhibitor and the efficiency is both concentration and temperature dependent. Optimum (95.2%) inhibitor efficiency was found with maximum extract concentration at 45˚C. Results also show a slight decrease of aluminum dissolution upon increasing temperature using Capparis decidua extract. Based on Langmuir adsorption model, Capparis decidua adsorption on aluminum surface shows a high regression coefficient value. Based on the observed results, the activation enthalpy (ΔH#) and activation entropy (ΔS#) have been estimated and discussed. The value, and sign, of the thermodynamic adsorption free energy (ΔGoads) indicate that Capparis decidua extract undergoes physisorption on aluminum surface. A mixed-type inhibition of Capparis decidua extract has been concluded from electrochemical polarization studies. The study clearly shows that Capparis decidua extract acted against aluminum corrosion in alkaline media by forming a protective film on the top of aluminum surface which was determined by SEM results.
{"title":"Capparis decidua: A Green Inhibitor for Pure Aluminum Corrosion in Basic Media","authors":"Mahmoud A. Al-Qudah, Rasha S. Hamaideh, I. Al-Momani, N. Al-Bataineh","doi":"10.18311/JSST/2020/23534","DOIUrl":"https://doi.org/10.18311/JSST/2020/23534","url":null,"abstract":"Aluminum corrosion inhibition using Capparis decidua extract has been studied. The study was performed in a 1.0 M solution of sodium hydroxide and was monitored both by measuring mass-loss and by using electro-chemical and polarization methods. In addition, surface morphology analysis was performed by applying the technique of Scanning Electron Microscopy (SEM). Results demonstrate effectiveness of Capparis decidua extract as an inhibitor and the efficiency is both concentration and temperature dependent. Optimum (95.2%) inhibitor efficiency was found with maximum extract concentration at 45˚C. Results also show a slight decrease of aluminum dissolution upon increasing temperature using Capparis decidua extract. Based on Langmuir adsorption model, Capparis decidua adsorption on aluminum surface shows a high regression coefficient value. Based on the observed results, the activation enthalpy (ΔH#) and activation entropy (ΔS#) have been estimated and discussed. The value, and sign, of the thermodynamic adsorption free energy (ΔGoads) indicate that Capparis decidua extract undergoes physisorption on aluminum surface. A mixed-type inhibition of Capparis decidua extract has been concluded from electrochemical polarization studies. The study clearly shows that Capparis decidua extract acted against aluminum corrosion in alkaline media by forming a protective film on the top of aluminum surface which was determined by SEM results.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42611084","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}
Pub Date : 2021-04-09DOI: 10.18311/JSST/2020/26019
Basem Ammar
The protective Zn-alloy coating enhances the carbon steels' corrosion resistance. Seven factors of Zn-Ni coating electroplating on medium carbon steel were optimized using Taguchi L27 (37) orthogonal array. The impact of nickel chloride concentration (N), distance factor between anode and cathode (X), plating process time (P), bath temperature (T), deposition current density (I), substrate hardness (H), and substrate roughness (R) on the corrosion current density (ICorr) and the coating thickness were examined. Two different samples were also morphologically studied. Results indicated that N:20 g l-1; X:9 cm; P:20 min; T:45 °C; I:3 A dm-2; H:44 HRC; and R:P500 can produce Zn-Ni coating with the highest corrosion resistance (lowest ICorr) with inhibition efficiency of 96.5%. Among factors, T, P, H, and N had the highest impact on ICorr with a total percentage contribution of about 60%. In addition, the thickness was mainly affected by I, P, and H, with a total percentage contribution >90%. The optimal combination for lowest ICorr resulted in a smooth and more homogenous and compact structure of coating without microcracks. Higher microhardness was also obtained due to the high nickel content in Zn-Ni coating (14.7%wt). However, the worst combination gave semi-spherical-shaped crystallites with non-uniform distribution of particles.
锌合金保护涂层提高了碳钢的耐腐蚀性。采用田口L27（37）正交试验法，对中碳钢镀锌镍镀层的7个因素进行了优化。考察了氯化镍浓度（N）、阳极和阴极之间的距离因子（X）、电镀工艺时间（P）、浴温度（T）、沉积电流密度（I）、基底硬度（H）和基底粗糙度（R）对腐蚀电流密度（ICorr）和涂层厚度的影响。还对两个不同的样品进行了形态学研究。结果表明：N:20g l-1；X： 9厘米；P： 20分钟；T： 45°C；I： 3 A dm-2；H： 44 HRC；R:P500可以制备出耐腐蚀性最高（ICorr最低）的Zn-Ni涂层，抑制率为96.5%。其中，T、P、H和N对ICorr的影响最大，总贡献率约为60%。此外，厚度主要受I、P和H的影响，总百分比贡献>90%。最低ICorr的最佳组合导致涂层结构光滑、更加均匀和紧凑，没有微裂纹。由于Zn-Ni涂层中的镍含量较高（14.7%wt），也获得了较高的显微硬度。然而，最差的组合产生了颗粒分布不均匀的半球形晶粒。
{"title":"Contribution of Seven Electroplating Factors on Some Properties of Zn-Ni Coating on Medium Carbon Steel using Taguchi's L27 Orthogonal Array","authors":"Basem Ammar","doi":"10.18311/JSST/2020/26019","DOIUrl":"https://doi.org/10.18311/JSST/2020/26019","url":null,"abstract":"The protective Zn-alloy coating enhances the carbon steels' corrosion resistance. Seven factors of Zn-Ni coating electroplating on medium carbon steel were optimized using Taguchi L27 (37) orthogonal array. The impact of nickel chloride concentration (N), distance factor between anode and cathode (X), plating process time (P), bath temperature (T), deposition current density (I), substrate hardness (H), and substrate roughness (R) on the corrosion current density (ICorr) and the coating thickness were examined. Two different samples were also morphologically studied. Results indicated that N:20 g l-1; X:9 cm; P:20 min; T:45 °C; I:3 A dm-2; H:44 HRC; and R:P500 can produce Zn-Ni coating with the highest corrosion resistance (lowest ICorr) with inhibition efficiency of 96.5%. Among factors, T, P, H, and N had the highest impact on ICorr with a total percentage contribution of about 60%. In addition, the thickness was mainly affected by I, P, and H, with a total percentage contribution >90%. The optimal combination for lowest ICorr resulted in a smooth and more homogenous and compact structure of coating without microcracks. Higher microhardness was also obtained due to the high nickel content in Zn-Ni coating (14.7%wt). However, the worst combination gave semi-spherical-shaped crystallites with non-uniform distribution of particles.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44430894","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}
Pub Date : 2021-04-09DOI: 10.18311/JSST/2020/20109
S. Konuru, V. Umasankar, A. Sarma
Nanostructured Tungsten (W) and Tungsten-Tantalum (W-25% Ta) thin films are generated on Reduced Activation Ferritic Martensitic (RAFM) steel substrates. The developed thin films are then analysed for their adhesive strength, hardness and elastic modulus properties. The addition of Tantalum by 25% as a composite material in Tungsten thin-film coating has increased the ductility and decreased the hardness of the film at room temperature condition. Tantalum addition has decreased the adhesion capability of the Tungsten film to the steel substrate. In this study, adhesion analysis is qualitatively assessed by indentation test, and hardness along with modulus are calculated using nanoindentation test.
{"title":"Development and Characterisation of W and W-25% Ta Composite Coatings on Steel Material","authors":"S. Konuru, V. Umasankar, A. Sarma","doi":"10.18311/JSST/2020/20109","DOIUrl":"https://doi.org/10.18311/JSST/2020/20109","url":null,"abstract":"Nanostructured Tungsten (W) and Tungsten-Tantalum (W-25% Ta) thin films are generated on Reduced Activation Ferritic Martensitic (RAFM) steel substrates. The developed thin films are then analysed for their adhesive strength, hardness and elastic modulus properties. The addition of Tantalum by 25% as a composite material in Tungsten thin-film coating has increased the ductility and decreased the hardness of the film at room temperature condition. Tantalum addition has decreased the adhesion capability of the Tungsten film to the steel substrate. In this study, adhesion analysis is qualitatively assessed by indentation test, and hardness along with modulus are calculated using nanoindentation test.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44385684","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}
Pub Date : 2020-12-19DOI: 10.18311/jsst/2020/27624
E. Board
No Abstract.
没有抽象的。
{"title":"Obituary of Dr. Suhaschandra Ghosh","authors":"E. Board","doi":"10.18311/jsst/2020/27624","DOIUrl":"https://doi.org/10.18311/jsst/2020/27624","url":null,"abstract":"No Abstract.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44053467","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}
Pub Date : 2020-08-20DOI: 10.18311/jsst/2020/24109
Nguyen Dinh Lam
Micro-patterns were created in a silicon dioxide (SiO2) dielectric layer (called SiO2 dielectric micro-pattern layer) via the photolithography and dry etching techniques. The SiO2 dielectric micro-pattern layer was utilized as an antireflection layer for solar cell application. The influences of structure of micro-pattern on the optical and electrical characteristics of solar cell were also investigated in detail. An improved performance of the GaAs solar cell by combination of antireflection coating layers and micro-pattern was observed. An enhancement in short circuit current density of 7.5% and conversion efficiency (about 1.2% absolute) were achieved in a cell coupling with the SiO2 dielectric 4 μm period micro-pattern layer compared to those of a reference cell. The influences of the SiO2 dielectric micro-pattern layer on other performance characteristics such as open circuit voltage and fill factor were not clearly observed. Light beam induced current measurement was also carried out to indicate the contribution of the light trapping and light scattering effects on the cell performance.
通过光刻和干蚀刻技术在二氧化硅(SiO2)介电层(称为SiO2介电微图案层)上形成微图案。二氧化硅介电微图案层被用作太阳能电池的增透层。研究了微晶片结构对太阳能电池光电特性的影响。采用增透涂层和微图案相结合的方法提高了砷化镓太阳能电池的性能。与参考电池相比，与SiO2介电4 Î μ m周期微图案层耦合的电池的短路电流密度提高了7.5%，转换效率提高了约1.2%。SiO2介电微图案层对开路电压和填充系数等其他性能特性的影响没有明显的观察。此外，还进行了光束感应电流测量，以表明光捕获和光散射效应对电池性能的贡献。
{"title":"SiO2 Dielectric Micro-Pattern Layer for Solar Cell Application","authors":"Nguyen Dinh Lam","doi":"10.18311/jsst/2020/24109","DOIUrl":"https://doi.org/10.18311/jsst/2020/24109","url":null,"abstract":"Micro-patterns were created in a silicon dioxide (SiO2) dielectric layer (called SiO2 dielectric micro-pattern layer) via the photolithography and dry etching techniques. The SiO2 dielectric micro-pattern layer was utilized as an antireflection layer for solar cell application. The influences of structure of micro-pattern on the optical and electrical characteristics of solar cell were also investigated in detail. An improved performance of the GaAs solar cell by combination of antireflection coating layers and micro-pattern was observed. An enhancement in short circuit current density of 7.5% and conversion efficiency (about 1.2% absolute) were achieved in a cell coupling with the SiO2 dielectric 4 μm period micro-pattern layer compared to those of a reference cell. The influences of the SiO2 dielectric micro-pattern layer on other performance characteristics such as open circuit voltage and fill factor were not clearly observed. Light beam induced current measurement was also carried out to indicate the contribution of the light trapping and light scattering effects on the cell performance.","PeriodicalId":17031,"journal":{"name":"Journal of Surface Science and Technology","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67530686","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}
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