The influence of the parameters of copper substrate on the wettability at different temperatures was studied experimentally and theoretically. It is known that water condensation on graphene leads to a change in the electrical properties and affects the graphene sensor sensitivity. To date, there is no data on the effect of temperature on surface properties of graphene synthesized on copper. It is shown for the first time that a change in the crystal orientation of copper (111), (110) and (100) leads to different structuring of water on copper and on graphene layer. An increase in temperature alters the density of water distribution and the pattern of water structuring. The analysis of the influence of grain boundaries on graphene synthesis is given. A change in the size of defects is shown to alter the qualitative nature of roughness for copper and graphene. Various methods of roughness processing allow us to explain the inconsistency of existing works comparing the roughness of the metal and graphene coating. The roughness measurement serves to prove our previously proposed hypothesis about the local stratification of graphene and copper due to large surface defects. The results obtained are important for the development of graphene-based sensor technologies.
{"title":"The influence of copper substrate temperature on the wettability of graphene coating","authors":"S. Misyura, V. Andryushchenko, V. Morozov","doi":"10.1680/jsuin.22.00021","DOIUrl":"https://doi.org/10.1680/jsuin.22.00021","url":null,"abstract":"The influence of the parameters of copper substrate on the wettability at different temperatures was studied experimentally and theoretically. It is known that water condensation on graphene leads to a change in the electrical properties and affects the graphene sensor sensitivity. To date, there is no data on the effect of temperature on surface properties of graphene synthesized on copper. It is shown for the first time that a change in the crystal orientation of copper (111), (110) and (100) leads to different structuring of water on copper and on graphene layer. An increase in temperature alters the density of water distribution and the pattern of water structuring. The analysis of the influence of grain boundaries on graphene synthesis is given. A change in the size of defects is shown to alter the qualitative nature of roughness for copper and graphene. Various methods of roughness processing allow us to explain the inconsistency of existing works comparing the roughness of the metal and graphene coating. The roughness measurement serves to prove our previously proposed hypothesis about the local stratification of graphene and copper due to large surface defects. The results obtained are important for the development of graphene-based sensor technologies.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46689579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
X. W. Chen, LP Cai, D. F. Zhang, M. Li, Y. Ran, W. Ping
To improve the surface micropores and high-temperature oxidation resistance of micro-arc oxidation (MAO) coating on TC4 titanium alloy, cerium dioxide (CeO2) particles were introduced into the electrolyte to prepare MAO composite coatings with different CeO2 content. X-ray diffractometer, scanning electron microscope and multifunctional material surface performance tester were used to analyze the phase composition, surface morphology and bonding force of the samples. TC4 substrate, undoped MAO sample and optimally doped MAO sample were oxidized at 650°C, 750°C and 850°C respectively. The results show that the best doped MAO samples show excellent high-temperature oxidation resistance at three temperatures. Compared with the undoped MAO sample, the maximum oxidation weight gain per unit area of the optimally doped MAO sample decreased by 10.8%, 19.6% and 22.1%, respectively. This is mainly because the thickness, hardness and adhesion of MAO coating are all increased by doping CeO2 particles, and a dense protective layer can also be formed on the surface of TC4 substrate. The invasion of oxygen medium is effectively prevented. In this research work, the optimal addition amount of CeO2 is 6 g/L.
{"title":"High-temperature oxidation behavior of CeO2 doped MAO coatings on TC4 titanium alloy","authors":"X. W. Chen, LP Cai, D. F. Zhang, M. Li, Y. Ran, W. Ping","doi":"10.1680/jsuin.22.00033","DOIUrl":"https://doi.org/10.1680/jsuin.22.00033","url":null,"abstract":"To improve the surface micropores and high-temperature oxidation resistance of micro-arc oxidation (MAO) coating on TC4 titanium alloy, cerium dioxide (CeO2) particles were introduced into the electrolyte to prepare MAO composite coatings with different CeO2 content. X-ray diffractometer, scanning electron microscope and multifunctional material surface performance tester were used to analyze the phase composition, surface morphology and bonding force of the samples. TC4 substrate, undoped MAO sample and optimally doped MAO sample were oxidized at 650°C, 750°C and 850°C respectively. The results show that the best doped MAO samples show excellent high-temperature oxidation resistance at three temperatures. Compared with the undoped MAO sample, the maximum oxidation weight gain per unit area of the optimally doped MAO sample decreased by 10.8%, 19.6% and 22.1%, respectively. This is mainly because the thickness, hardness and adhesion of MAO coating are all increased by doping CeO2 particles, and a dense protective layer can also be formed on the surface of TC4 substrate. The invasion of oxygen medium is effectively prevented. In this research work, the optimal addition amount of CeO2 is 6 g/L.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49286422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ying Xie, Chuanchuan Guo, Tao Li, Shenzhi Wang, Ri Liu, Litong Dong, Lu Wang, Zhengxun Song, Z. Weng, Zuobin Wang
Reducing energy consumption is one of the most effective ways to solve the problem of energy shortage. In this work, the nature-inspired paint microgroove arrays with different periods were fabricated using a one-step laser ablation method. The wind tunnel experiment was performed at two wind speeds 27.7 m/s and 33. m/s to collect the drag force data on smooth and structured paint coatings. The results shown that the microgroove arrays oriented perpendicular to the flow direction were beneficial to drag reduction, and the drag reduction rate of up to 7.2% was obtained. Meanwhile, the microgroove arrays induced by laser ablation changes the wettability of paint surface to hydrophobicity. The contact angle (CA) shows a slightly decrease trend with the increase of the periodic scale. Besides, the anticorrosion properties of these microgrooves make them advantageous in harsh environments. The fabricated drag-reducing paint microstructures, with the features of self-cleaning and durability, have the potential to be applied on vehicles to realize speed improvement and energy saving.
{"title":"Bio-inspired microgroove arrays with drag reduction and hydrophobic properties","authors":"Ying Xie, Chuanchuan Guo, Tao Li, Shenzhi Wang, Ri Liu, Litong Dong, Lu Wang, Zhengxun Song, Z. Weng, Zuobin Wang","doi":"10.1680/jsuin.22.00031","DOIUrl":"https://doi.org/10.1680/jsuin.22.00031","url":null,"abstract":"Reducing energy consumption is one of the most effective ways to solve the problem of energy shortage. In this work, the nature-inspired paint microgroove arrays with different periods were fabricated using a one-step laser ablation method. The wind tunnel experiment was performed at two wind speeds 27.7 m/s and 33. m/s to collect the drag force data on smooth and structured paint coatings. The results shown that the microgroove arrays oriented perpendicular to the flow direction were beneficial to drag reduction, and the drag reduction rate of up to 7.2% was obtained. Meanwhile, the microgroove arrays induced by laser ablation changes the wettability of paint surface to hydrophobicity. The contact angle (CA) shows a slightly decrease trend with the increase of the periodic scale. Besides, the anticorrosion properties of these microgrooves make them advantageous in harsh environments. The fabricated drag-reducing paint microstructures, with the features of self-cleaning and durability, have the potential to be applied on vehicles to realize speed improvement and energy saving.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46002426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Photoelectrochemical water splitting converts solar energy into clean hydrogen fuel. In this system, the preparation of high-quality photoanode is essential for achieving efficient solar hydrolysis. Polymeric carbon nitride has emerged as a promising photocatalyst for solar water splitting due to its visible light absorption, suitable band edge positions and good chemical stability. However, considerable difficulties have been encountered for the preparation of robust and well-bonded carbon nitride films on conductive substrates. Herein, a combined strategy of electrophoresis and vapor deposition results in robust and high performing carbon nitride film photoelectrodes with good bonding on substrates, suitable thickness for light absorption, and enhanced charge separation and transfer abilities. The unique structure of the photoanode thus facilitates the oxidation of water and leads to an optimal photocurrent density of approximately 120 μA cm-2 at 1.23 VRHE. This work provides new insights for the preparation of polymeric carbon nitride film photoelectrodes, promoting the developments of photoelectric and photoelectrochemical applications based on carbon nitride.
{"title":"Carbon nitride photoelectrode prepared via a combined strategy of electrophoresis and vapor deposition","authors":"Zhiqiang Xie, Yuqing Wang, Wei Peng, Zhehan Yi, Tao Zhang, Wenping Si, Feng Hou","doi":"10.1680/jsuin.22.00048","DOIUrl":"https://doi.org/10.1680/jsuin.22.00048","url":null,"abstract":"Photoelectrochemical water splitting converts solar energy into clean hydrogen fuel. In this system, the preparation of high-quality photoanode is essential for achieving efficient solar hydrolysis. Polymeric carbon nitride has emerged as a promising photocatalyst for solar water splitting due to its visible light absorption, suitable band edge positions and good chemical stability. However, considerable difficulties have been encountered for the preparation of robust and well-bonded carbon nitride films on conductive substrates. Herein, a combined strategy of electrophoresis and vapor deposition results in robust and high performing carbon nitride film photoelectrodes with good bonding on substrates, suitable thickness for light absorption, and enhanced charge separation and transfer abilities. The unique structure of the photoanode thus facilitates the oxidation of water and leads to an optimal photocurrent density of approximately 120 μA cm-2 at 1.23 VRHE. This work provides new insights for the preparation of polymeric carbon nitride film photoelectrodes, promoting the developments of photoelectric and photoelectrochemical applications based on carbon nitride.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47045354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The antimicrobial and hemostatic activities of wound dressing drew more and more attention in the healthcare or medical industry. Here, the quaternary ammonium groups were introduced in the chitosan backbone via co-polymerization, and the quaternized chitosan was coated on the cotton fabric through the PDC process. Compared with BPTCD treated cotton (cotton/BPTCD), the breaking strength of CS-b-pSBMA coated cotton (cotton/SBMA) have not affected by the addition of CS-b-pSBMA. The SBMA coated cotton displayed good liquid adsorptive activity with or without pressure. As a dressing material, cotton/SBMA exhibited good hemostatic activity and hemocompatibility. After being challenged with E. coli O157:H7 and S. aureus for 60 min, cotton/SBMA showed good antimicrobial properties, and 100% bacteria was inhibited within the contact time. These attractive functions make the quaternized chitosan-coated cotton fabrics a good candidate for wound dressing materials.
{"title":"Synthesis of quaternized chitosan and its application in cotton as wound dressing material","authors":"Yingfeng Wang, Mengfan Zhang, Hao Hou, Maoli Yin, Zhipeng Ma, Kefan Chen, Qizhen Huang","doi":"10.1680/jsuin.22.00037","DOIUrl":"https://doi.org/10.1680/jsuin.22.00037","url":null,"abstract":"The antimicrobial and hemostatic activities of wound dressing drew more and more attention in the healthcare or medical industry. Here, the quaternary ammonium groups were introduced in the chitosan backbone via co-polymerization, and the quaternized chitosan was coated on the cotton fabric through the PDC process. Compared with BPTCD treated cotton (cotton/BPTCD), the breaking strength of CS-b-pSBMA coated cotton (cotton/SBMA) have not affected by the addition of CS-b-pSBMA. The SBMA coated cotton displayed good liquid adsorptive activity with or without pressure. As a dressing material, cotton/SBMA exhibited good hemostatic activity and hemocompatibility. After being challenged with E. coli O157:H7 and S. aureus for 60 min, cotton/SBMA showed good antimicrobial properties, and 100% bacteria was inhibited within the contact time. These attractive functions make the quaternized chitosan-coated cotton fabrics a good candidate for wound dressing materials.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43492651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Md Salauddin Sk, Rony Mia, Ejajul Hoque, B. Ahmed, Md. Jawad Ibn Amin, Shekh Md. Mamun Kabir, Sakil Mahmud
Herein, the influence of the antimicrobial treatments of organic cotton fabrics (OCFs) using silver-copper-zeolite microparticles (hereafter referred to as ‘zeolite’) was investigated. There were six different methods applied to six different types of OCFs. The antimicrobial performances demonstrate around 95.33% and 93.88% reduction of gram-positive and gram-negative bacteria after 30 times home laundry, respectively. The color stability yield by the surface plasmon resonance mates the commercial requirement in items of colorfastness ratings of 3-4 for wash, 4 for light, 4-5 for dry rubbing, and 3-4 for wet rubbing. These findings established that this treatment successfully endowed OCFs with long-lasting antimicrobial capabilities and thermal stability due to the interaction with the microparticles. The phenomenon was further confirmed by morphological, spectroscopical, and thermal characterization. This approach of OCFs functionalization avoiding hazardous chemicals could be a benchmark for antimicrobial performances in sustainable industrial applications.
{"title":"Antimicrobial performance of silver-copper-zeolite microparticles treated organic cotton fabric using versatile methods","authors":"Md Salauddin Sk, Rony Mia, Ejajul Hoque, B. Ahmed, Md. Jawad Ibn Amin, Shekh Md. Mamun Kabir, Sakil Mahmud","doi":"10.1680/jsuin.22.00023","DOIUrl":"https://doi.org/10.1680/jsuin.22.00023","url":null,"abstract":"Herein, the influence of the antimicrobial treatments of organic cotton fabrics (OCFs) using silver-copper-zeolite microparticles (hereafter referred to as ‘zeolite’) was investigated. There were six different methods applied to six different types of OCFs. The antimicrobial performances demonstrate around 95.33% and 93.88% reduction of gram-positive and gram-negative bacteria after 30 times home laundry, respectively. The color stability yield by the surface plasmon resonance mates the commercial requirement in items of colorfastness ratings of 3-4 for wash, 4 for light, 4-5 for dry rubbing, and 3-4 for wet rubbing. These findings established that this treatment successfully endowed OCFs with long-lasting antimicrobial capabilities and thermal stability due to the interaction with the microparticles. The phenomenon was further confirmed by morphological, spectroscopical, and thermal characterization. This approach of OCFs functionalization avoiding hazardous chemicals could be a benchmark for antimicrobial performances in sustainable industrial applications.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41807507","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zhangyang Zhou, B. Ma, Xin Zhang, C. Deng, Shujie Yang, Chuanbo Hu
In this study, a combination of hydrothermal and sol-gel methods was used to prepare superhydrophobic polydimethylsiloxane (PDMS)/TiO2 composite coating with good self-cleaning properties and corrosion resistance. The structural, surface roughness and wettability behavior of the PDMS/TiO2 superhydrophobic coatings were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), and contact angles measurements. Results showed that surfaces of composite coatings possessed rough hierarchical micro/nanostructures, especially, the surface water contact angle is as high as 160° and the sliding angle is less than 2.1° when the ratio of PDMS/TiO2 was 1:5. In addition, through a series of high-temperature exposure, acid-alkali resistance, self-cleaning, and electrochemical corrosion tests, it was also found that the superhydrophobic surface with a PDMS/TiO2 ratio of 1:5 had excellent properties, and showed certain practicability in terms of anticorrosion, antipollution and durability. Therefore, it can be concluded that this kind of corrosion resistant superhydrophobic PDMS/TiO2 composite coating with simple operation, high performance and multi-scale use on metal substrates has good application prospects in harsh environments.
{"title":"Fabrication of superhydrophobic PDMS/TiO2 composite coatings with corrosion resistance","authors":"Zhangyang Zhou, B. Ma, Xin Zhang, C. Deng, Shujie Yang, Chuanbo Hu","doi":"10.1680/jsuin.22.00013","DOIUrl":"https://doi.org/10.1680/jsuin.22.00013","url":null,"abstract":"In this study, a combination of hydrothermal and sol-gel methods was used to prepare superhydrophobic polydimethylsiloxane (PDMS)/TiO2 composite coating with good self-cleaning properties and corrosion resistance. The structural, surface roughness and wettability behavior of the PDMS/TiO2 superhydrophobic coatings were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), atomic force microscopy (AFM), and contact angles measurements. Results showed that surfaces of composite coatings possessed rough hierarchical micro/nanostructures, especially, the surface water contact angle is as high as 160° and the sliding angle is less than 2.1° when the ratio of PDMS/TiO2 was 1:5. In addition, through a series of high-temperature exposure, acid-alkali resistance, self-cleaning, and electrochemical corrosion tests, it was also found that the superhydrophobic surface with a PDMS/TiO2 ratio of 1:5 had excellent properties, and showed certain practicability in terms of anticorrosion, antipollution and durability. Therefore, it can be concluded that this kind of corrosion resistant superhydrophobic PDMS/TiO2 composite coating with simple operation, high performance and multi-scale use on metal substrates has good application prospects in harsh environments.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47994653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Herein, we are interested to provide the synthetic methodologies, chemical properties, and the corrosion performance of some Ni-xCo-yTiO2 nanocomposite electroplated on Cu using the gluconate-cysteine bath, pointing at the classification of these materials corresponding to their stability in that simulated marine solution and recommend using these materials in such aggressive media. Electrochemical and spectroscopic measurements were employed in 3.5 wt. % NaCl electrolytes at 25°C. The electrochemical properties of the applicable nanocomposite material will be studied to enhance manufacturing technology and forecast the stability of structures made from it. The produced nanocomposite coatings have been demonstrated to have high corrosion resistance in the investigated electrolyte, which is commonly utilized in hydrogen evolution reaction applications and other novel materials corrosion investigations. By characterizing the corrosion performance of the examined Ni-xCo-yTiO2 nanocomposite coatings in 3.5 wt.% NaCl solution, the Ni-48Co-3.8TiO2 is regarded as the most stable electrode. The results exposed that the inclusion of Co inside Ni-xCo-yTiO2 significantly lessened the corrosion rate of the investigated composites. The surface examination revealed the presence of several materials constituents in the passive layer. DFT and Monte Carlo simulation approaches have been used to investigate and analyze the relationship between molecular structure and inhibitory effect.
{"title":"Anticorrosion and surface evaluation of some electrodeposited Ni-Co-TiO2 nanocomposite coatings in 3.5 wt. % NaCl solutions","authors":"H. Nady, M. Negem, E. E. El-Katori","doi":"10.1680/jsuin.22.00017","DOIUrl":"https://doi.org/10.1680/jsuin.22.00017","url":null,"abstract":"Herein, we are interested to provide the synthetic methodologies, chemical properties, and the corrosion performance of some Ni-xCo-yTiO2 nanocomposite electroplated on Cu using the gluconate-cysteine bath, pointing at the classification of these materials corresponding to their stability in that simulated marine solution and recommend using these materials in such aggressive media. Electrochemical and spectroscopic measurements were employed in 3.5 wt. % NaCl electrolytes at 25°C. The electrochemical properties of the applicable nanocomposite material will be studied to enhance manufacturing technology and forecast the stability of structures made from it. The produced nanocomposite coatings have been demonstrated to have high corrosion resistance in the investigated electrolyte, which is commonly utilized in hydrogen evolution reaction applications and other novel materials corrosion investigations. By characterizing the corrosion performance of the examined Ni-xCo-yTiO2 nanocomposite coatings in 3.5 wt.% NaCl solution, the Ni-48Co-3.8TiO2 is regarded as the most stable electrode. The results exposed that the inclusion of Co inside Ni-xCo-yTiO2 significantly lessened the corrosion rate of the investigated composites. The surface examination revealed the presence of several materials constituents in the passive layer. DFT and Monte Carlo simulation approaches have been used to investigate and analyze the relationship between molecular structure and inhibitory effect.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45099154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Pavlov, F. Valeeva, G. Gaynanova, D. Kuznetsov, L. Zakharova
Mono-, di-, triethanolamine in a combination with methylmorpholinium and hydroxyethylmorpholinium surfactants were investigated for their aggregation and solubilizing properties. A cooperative behavior of the solubilization by mixed surfactant – ethanolamine systems is described. Ethanolamines strongly affect pH and lead to Orange OT phenolic group deprotonation and subsequent increase in aqueous/micellar solubility. The morpholinium surfactant micelles reduce pKa of Orange OT phenolic group, enabling its deprotonation at the earlier stages of media alkalinization. Obtained surfactant – ethanolamine mixtures can solubilize very large amounts of hydrophobic dye, which can then be triggered to precipitate via acidification.
{"title":"Aggregation of morpholinium surfactants with amino alcohols as additives: a close look","authors":"R. Pavlov, F. Valeeva, G. Gaynanova, D. Kuznetsov, L. Zakharova","doi":"10.1680/jsuin.22.00006","DOIUrl":"https://doi.org/10.1680/jsuin.22.00006","url":null,"abstract":"Mono-, di-, triethanolamine in a combination with methylmorpholinium and hydroxyethylmorpholinium surfactants were investigated for their aggregation and solubilizing properties. A cooperative behavior of the solubilization by mixed surfactant – ethanolamine systems is described. Ethanolamines strongly affect pH and lead to Orange OT phenolic group deprotonation and subsequent increase in aqueous/micellar solubility. The morpholinium surfactant micelles reduce pKa of Orange OT phenolic group, enabling its deprotonation at the earlier stages of media alkalinization. Obtained surfactant – ethanolamine mixtures can solubilize very large amounts of hydrophobic dye, which can then be triggered to precipitate via acidification.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45619406","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cu-based materials have been extensively studied for nitrate removal as an inexpensive and abundant electrocatalyst for water purification via the nitrate reduction reaction (NO3RR). But it typically suffers from nitrite accumulation due to the high selectivity towards nitrite formation. To address this issue, we herein report a strategy of modifying Cu nanowires with Ni nanoparticles to improve the NO3RR performance. The Ni nanoparticles both facilitate electron transfer from Ni to Cu and enhance the conversion of nitrite, thereby improving the overall removal of nitrate with a minimal yield of nitrite. Through a facile liquid phase deposition process, the loading amount of Ni nanoparticles can be easily tailored by simply changing the concentration of precursors, and the best Cu/Ni molar ratio for nitrate removal performance is 20. Under this ratio, the material simultaneously delivers a high nitrate removal rate of 92.2% and a low nitrite selectivity of only 2.2% at –0.9 V vs. reversible hydrogen electrode, accompanied with superior stability for a continuous NO3RR. This study thus offers an efficient, stable, and low-cost Cu-Ni bimetallic catalyst for NO3RR.
{"title":"Ni nanoparticles modified Cu nanowires for enhanced electrocatalytic nitrate removal","authors":"Yiyang Feng, Xiaoqing Liu, Zhehan Yi, Haotian Tan, Liqun Wang, Feng Hou, Ji Liang","doi":"10.1680/jsuin.22.00040","DOIUrl":"https://doi.org/10.1680/jsuin.22.00040","url":null,"abstract":"Cu-based materials have been extensively studied for nitrate removal as an inexpensive and abundant electrocatalyst for water purification via the nitrate reduction reaction (NO3RR). But it typically suffers from nitrite accumulation due to the high selectivity towards nitrite formation. To address this issue, we herein report a strategy of modifying Cu nanowires with Ni nanoparticles to improve the NO3RR performance. The Ni nanoparticles both facilitate electron transfer from Ni to Cu and enhance the conversion of nitrite, thereby improving the overall removal of nitrate with a minimal yield of nitrite. Through a facile liquid phase deposition process, the loading amount of Ni nanoparticles can be easily tailored by simply changing the concentration of precursors, and the best Cu/Ni molar ratio for nitrate removal performance is 20. Under this ratio, the material simultaneously delivers a high nitrate removal rate of 92.2% and a low nitrite selectivity of only 2.2% at –0.9 V vs. reversible hydrogen electrode, accompanied with superior stability for a continuous NO3RR. This study thus offers an efficient, stable, and low-cost Cu-Ni bimetallic catalyst for NO3RR.","PeriodicalId":22032,"journal":{"name":"Surface Innovations","volume":" ","pages":""},"PeriodicalIF":3.5,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49160871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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