Pub Date : 2023-07-05DOI: 10.1088/2051-672X/ace467
Xiang Wang, Changxi Jiang, Tao Liu, Dan Qin, Baoquan Chen, Xuehui Zhang, Tongxiang Liang
Surface nanocrystalline layers were prepared on Cu-8Cr alloy using ultrasonic shot peening (USSP) technique by controlling the pellet size and shot peening time. The tissue morphology, microstructure, surface hardness, surface strength and corrosion resistance of the generated surface nanolayers were systematically characterized using x-ray diffractometer (XRD), scanning electron microscope (SEM), and the corresponding test methods. The results showed that the USSP treatment did not change the surface phase of Cu-8Cr alloy, but only refined the surface grains into nanocrystals. The pellet size and shot peening time had a large effect on the surface properties of Cu-8Cr alloy. The best overall surface properties were obtained with a shot size of 2 mm and a shot time of 30 min The average grain size of the nano-layer is about 66 nm, the surface hardness is increased to 126.69 HV0.05, the tensile strength reached 417 MPa, and the corrosion resistance of the alloy is significantly enhanced. The USSP treatment provides a new method for the preparation of CuCr alloys with excellent surface properties.
{"title":"Effect of ultrasonic surface shot peening on the microstructure and properties of Cu-8Cr alloy","authors":"Xiang Wang, Changxi Jiang, Tao Liu, Dan Qin, Baoquan Chen, Xuehui Zhang, Tongxiang Liang","doi":"10.1088/2051-672X/ace467","DOIUrl":"https://doi.org/10.1088/2051-672X/ace467","url":null,"abstract":"Surface nanocrystalline layers were prepared on Cu-8Cr alloy using ultrasonic shot peening (USSP) technique by controlling the pellet size and shot peening time. The tissue morphology, microstructure, surface hardness, surface strength and corrosion resistance of the generated surface nanolayers were systematically characterized using x-ray diffractometer (XRD), scanning electron microscope (SEM), and the corresponding test methods. The results showed that the USSP treatment did not change the surface phase of Cu-8Cr alloy, but only refined the surface grains into nanocrystals. The pellet size and shot peening time had a large effect on the surface properties of Cu-8Cr alloy. The best overall surface properties were obtained with a shot size of 2 mm and a shot time of 30 min The average grain size of the nano-layer is about 66 nm, the surface hardness is increased to 126.69 HV0.05, the tensile strength reached 417 MPa, and the corrosion resistance of the alloy is significantly enhanced. The USSP treatment provides a new method for the preparation of CuCr alloys with excellent surface properties.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"35 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89316324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-07-05DOI: 10.1088/2051-672X/ace275
Ravi Shankar Nadig, A. Bharatish, H. Murthy, I. Manoj, P. Vinod
This paper examines the impact of Laser Surface Texturing (LST) on the tribological performance of a commercial automotive brake system consisting of a metallic brake disc and composite brake pads. The study focuses on achieving an optimal combination of wear and friction, aligning with the goals of green technology. The Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) methodology is used to rank the characteristics, while the Adaptive Neuro Fuzzy Interference System (ANFIS) methodology is employed to model the friction and wear behavior of the brake pad-disc system under varying normal loads and sliding speeds. At a normal load of 100 N and a sliding speed of 0.73 m s−1 under dry conditions, the brake system exhibited a minimum coefficient of friction of 0.2066 and a specific wear rate of 7.93 × 10−6 mm3 N−1-m−1. Although, there was no specific correlation found between frictional power and specific wear rate, a higher load of 100 N and sliding speed of 2.71 m s−1 resulted in decrease in specific wear rate by 83% when compared to that of untextured brake discs. By applying brake oil to the laser-textured boundary, the coefficient of friction experienced a 31% reduction.
本文研究了激光表面变形(LST)对由金属制动盘和复合刹车片组成的商用汽车制动系统摩擦学性能的影响。这项研究的重点是实现磨损和摩擦的最佳组合，与绿色技术的目标保持一致。采用TOPSIS (Order Preference Technique by Similarity to Ideal Solution)方法对特征进行排序，采用自适应神经模糊干扰系统(ANFIS)方法对不同正常载荷和滑动速度下刹车片-盘系统的摩擦磨损行为进行建模。在干工况下，正常载荷为100 N，滑动速度为0.73 m s−1时，制动系统的最小摩擦系数为0.2066，比磨损率为7.93 × 10−6 mm3 N−1-m−1。虽然没有发现摩擦功率和比磨损率之间的具体相关性，但与没有纹理的制动盘相比，更高的100 N负载和2.71 m s - 1的滑动速度导致比磨损率降低了83%。通过将刹车油涂在激光纹理边界上，摩擦系数降低了31%。
{"title":"Assessment of tribological behaviour of laser textured brake disc/composite brake pad system using adaptive neuro fuzzy interference system technique","authors":"Ravi Shankar Nadig, A. Bharatish, H. Murthy, I. Manoj, P. Vinod","doi":"10.1088/2051-672X/ace275","DOIUrl":"https://doi.org/10.1088/2051-672X/ace275","url":null,"abstract":"This paper examines the impact of Laser Surface Texturing (LST) on the tribological performance of a commercial automotive brake system consisting of a metallic brake disc and composite brake pads. The study focuses on achieving an optimal combination of wear and friction, aligning with the goals of green technology. The Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) methodology is used to rank the characteristics, while the Adaptive Neuro Fuzzy Interference System (ANFIS) methodology is employed to model the friction and wear behavior of the brake pad-disc system under varying normal loads and sliding speeds. At a normal load of 100 N and a sliding speed of 0.73 m s−1 under dry conditions, the brake system exhibited a minimum coefficient of friction of 0.2066 and a specific wear rate of 7.93 × 10−6 mm3 N−1-m−1. Although, there was no specific correlation found between frictional power and specific wear rate, a higher load of 100 N and sliding speed of 2.71 m s−1 resulted in decrease in specific wear rate by 83% when compared to that of untextured brake discs. By applying brake oil to the laser-textured boundary, the coefficient of friction experienced a 31% reduction.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"15 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73467342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-20DOI: 10.1088/2051-672X/acdfe9
Ashutosh Roy, Kumar Vemaganti
The topography of human skin surface has cutaneous lines or skin tension lines whose orientation depends on factors like age, cosmetic use, environmental conditions, etc. Characterizing the orientation of these lines is of immense importance for the cosmetics industry, medical technology and applications like haptics. In this study we propose a simple method based on the ratio of the correlation length to the root mean square roughness along several profiles to characterize the directionality of these lines. This ratio is then normalized across all the profiles leading to a polar plot that varies between 0 and 1, with the major orientation appearing at a value of 1. Our results show that this non-invasive computational approach can be applied to skin roughness data or image intensities. As a practical application of the approach, we demonstrate its ability to capture changes in skin tension line orientation with age, using roughness data from the literature.
{"title":"A non-invasive computational method to determine the directionality of skin tension lines","authors":"Ashutosh Roy, Kumar Vemaganti","doi":"10.1088/2051-672X/acdfe9","DOIUrl":"https://doi.org/10.1088/2051-672X/acdfe9","url":null,"abstract":"The topography of human skin surface has cutaneous lines or skin tension lines whose orientation depends on factors like age, cosmetic use, environmental conditions, etc. Characterizing the orientation of these lines is of immense importance for the cosmetics industry, medical technology and applications like haptics. In this study we propose a simple method based on the ratio of the correlation length to the root mean square roughness along several profiles to characterize the directionality of these lines. This ratio is then normalized across all the profiles leading to a polar plot that varies between 0 and 1, with the major orientation appearing at a value of 1. Our results show that this non-invasive computational approach can be applied to skin roughness data or image intensities. As a practical application of the approach, we demonstrate its ability to capture changes in skin tension line orientation with age, using roughness data from the literature.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"70 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77660449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-07DOI: 10.1088/2051-672X/acdc3e
Christopher Jackson, P. Bills, P. Humphreys, Carolanne Allen
The aim of this study was to investigate the effects prosthesis relevant surfaces and finishes have on the formation of Staphylococcus aureus (S. aureus) biofilms, the leading causative pathogenic bacteria of periprosthetic joint infection (PJI). Microbiological biofilm analysis was conducted to quantify S. aureus biofilm growth on prosthesis relevant surface coatings and finishes. Through the use of a CDC Biofilm Reactor (CDC-BR), biofilms were grown under constant shear conditions on three different titanium surface finishes, including Plasma Spray (PS), Grit Blasted (GB) and an As-fabricated (AF) surface used for comparative and control purposes. Advanced metrological techniques were applied to characterise each surface. This advanced approach to surface characterisation, including functional volume parameters has been carried out to provide a detailed quantifiable description of the surface and one that better relates to the nature of growth upon a surface. Results show that the PS surface exhibits a significant increase in biofilm growth in comparison to the GB and AF surfaces, with the AF surface showing the lowest amount of biofilm growth. Additionally, the morphology of the features of the PS coating allows for the biofilm accumulation to flourish in the re-entrant features across its topography. These findings highlight the difficulties of biofilm eradication and further complicate the design process of prosthetics, where features implemented to promote osseointegration simultaneously offer favourable locations for bacterial cell attachment and subsequent biofilm development, leading potentially, to PJI. There is a general consensus throughout literature regarding an apparent trend between an increase in Sa and an increase in biofilm formation (Zheng et al 2021 Frontiers in Bioengineering and Biotechnology 9 643722; Bridgens et al 2015 Surface and Coatings Technology 284; James et al 2019 Aesthetic Plast. Surg. 43 490–497). This study has shown that whilst this may generally be the case, the location of this surface area increase within the topography may be a more important observation.
本研究旨在探讨假体相关表面和表面处理对假体周围关节感染(PJI)的主要致病菌金黄色葡萄球菌(S. aureus)生物膜形成的影响。通过微生物生物膜分析，量化金黄色葡萄球菌在假体相关表面涂层和饰面上的生物膜生长情况。通过使用CDC生物膜反应器(CDC- br)，在恒定剪切条件下在三种不同的钛表面上生长生物膜，包括等离子喷涂(PS)，喷砂(GB)和As-fabricated (AF)表面，用于比较和对照目的。先进的计量技术被应用于表征每个表面。这种先进的表面表征方法，包括功能体积参数，已被用于提供表面的详细可量化描述，并且更好地与表面上生长的性质相关。结果表明，与GB和AF相比，PS表面的生物膜生长明显增加，AF表面的生物膜生长最少。此外，PS涂层特征的形态允许生物膜的积累在其地形的重新进入特征中蓬勃发展。这些发现强调了去除生物膜的困难，并进一步使假肢的设计过程复杂化，其中促进骨整合的特征同时为细菌细胞附着和随后的生物膜发育提供了有利的位置，可能导致PJI。文献中普遍认为Sa的增加与生物膜形成的增加之间存在明显的趋势(Zheng et al . 2021《生物工程与生物技术前沿》9 643722;brigens等2015年表面和涂层技术284;James等2019美学整形。外科杂志43 490-497)。这项研究表明，虽然这可能是普遍的情况，但这种表面积增加在地形中的位置可能是一个更重要的观察结果。
{"title":"An investigation into the effects of prosthesis relevant surfaces on the formation of Staphylococcus aureus biofilms","authors":"Christopher Jackson, P. Bills, P. Humphreys, Carolanne Allen","doi":"10.1088/2051-672X/acdc3e","DOIUrl":"https://doi.org/10.1088/2051-672X/acdc3e","url":null,"abstract":"The aim of this study was to investigate the effects prosthesis relevant surfaces and finishes have on the formation of Staphylococcus aureus (S. aureus) biofilms, the leading causative pathogenic bacteria of periprosthetic joint infection (PJI). Microbiological biofilm analysis was conducted to quantify S. aureus biofilm growth on prosthesis relevant surface coatings and finishes. Through the use of a CDC Biofilm Reactor (CDC-BR), biofilms were grown under constant shear conditions on three different titanium surface finishes, including Plasma Spray (PS), Grit Blasted (GB) and an As-fabricated (AF) surface used for comparative and control purposes. Advanced metrological techniques were applied to characterise each surface. This advanced approach to surface characterisation, including functional volume parameters has been carried out to provide a detailed quantifiable description of the surface and one that better relates to the nature of growth upon a surface. Results show that the PS surface exhibits a significant increase in biofilm growth in comparison to the GB and AF surfaces, with the AF surface showing the lowest amount of biofilm growth. Additionally, the morphology of the features of the PS coating allows for the biofilm accumulation to flourish in the re-entrant features across its topography. These findings highlight the difficulties of biofilm eradication and further complicate the design process of prosthetics, where features implemented to promote osseointegration simultaneously offer favourable locations for bacterial cell attachment and subsequent biofilm development, leading potentially, to PJI. There is a general consensus throughout literature regarding an apparent trend between an increase in Sa and an increase in biofilm formation (Zheng et al 2021 Frontiers in Bioengineering and Biotechnology 9 643722; Bridgens et al 2015 Surface and Coatings Technology 284; James et al 2019 Aesthetic Plast. Surg. 43 490–497). This study has shown that whilst this may generally be the case, the location of this surface area increase within the topography may be a more important observation.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"28 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85169732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.1088/2051-672X/acdfea
Bruno Alderete, U. Pranav Nayak, F. Mücklich, S. Suárez
The design of an electrical contact is crucial to ensure optimal performance, reliability, and efficiency of connectors. One key aspect is the surface quality of the contacting bodies—among other factors such as material selection, contact geometry, etc. In this work, we evaluated the influence on electrical contact resistance (ECR) of a smooth copper-based surface (brass, bronze, and tin-plated copper) when contacted against surfaces with different degrees of roughness. Furthermore, a carbon nanotube (CNT) coating was proposed with the goal of mitigating the topography-induced influence of the textured counter electrodes. The electrodes and counter electrodes were thoroughly characterized to understand the contacting mechanisms through numerical modeling,—namely, Greenwood-Williamson and Jackson-Green models—as well as using a practical-oriented slope analysis. Load-dependent ECR measurements were carried out to quantify the effect of roughness on contact resistance. When contacting against brass and bronze, a clear correlation between roughness and ECR can be established, with higher roughness equating to lower ECR In tin-plated copper, on the other hand, this hierarchy is not as well defined due to the ease with which the tin plating deforms, thus enabling the penetration of outstanding asperities and consequently establishing a better electrical contact. CNT-coated counter electrodes showed promising results, partially confirming the hypothesis proposed. However, unforeseen topography-related interactions with the CNT coating produced exceptions in the ECR measurements. Nonetheless, for most cases studied the coating did mitigate the influence of roughness.
{"title":"Influence of topography on electrical contact resistance of copper-based materials","authors":"Bruno Alderete, U. Pranav Nayak, F. Mücklich, S. Suárez","doi":"10.1088/2051-672X/acdfea","DOIUrl":"https://doi.org/10.1088/2051-672X/acdfea","url":null,"abstract":"The design of an electrical contact is crucial to ensure optimal performance, reliability, and efficiency of connectors. One key aspect is the surface quality of the contacting bodies—among other factors such as material selection, contact geometry, etc. In this work, we evaluated the influence on electrical contact resistance (ECR) of a smooth copper-based surface (brass, bronze, and tin-plated copper) when contacted against surfaces with different degrees of roughness. Furthermore, a carbon nanotube (CNT) coating was proposed with the goal of mitigating the topography-induced influence of the textured counter electrodes. The electrodes and counter electrodes were thoroughly characterized to understand the contacting mechanisms through numerical modeling,—namely, Greenwood-Williamson and Jackson-Green models—as well as using a practical-oriented slope analysis. Load-dependent ECR measurements were carried out to quantify the effect of roughness on contact resistance. When contacting against brass and bronze, a clear correlation between roughness and ECR can be established, with higher roughness equating to lower ECR In tin-plated copper, on the other hand, this hierarchy is not as well defined due to the ease with which the tin plating deforms, thus enabling the penetration of outstanding asperities and consequently establishing a better electrical contact. CNT-coated counter electrodes showed promising results, partially confirming the hypothesis proposed. However, unforeseen topography-related interactions with the CNT coating produced exceptions in the ECR measurements. Nonetheless, for most cases studied the coating did mitigate the influence of roughness.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"744 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76891158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The purpose of this study is to discuss the effect of the bearing waviness on the lubrication performances of coupled journal-thrust water-lubricated bearings using an elastohydrodynamic lubrication model. The results of the numerical model are compared to the published experimental data to verify the validity of the numerical model. The load capacity and maximum fluid pressure under different parameters of waviness of coupled journal-thrust bearings are calculated by numerical model, and then the influence of the bearing waviness on the performance of coupled journal-thrust water-lubricated bearings is analyzed. The simulation results show that the waviness amplitude has great influence on the bearing performances and the effect becomes increasingly pronounced with the growth of waviness amplitude. For the waviness of journal bearings, the performances are more sensitive to the waviness arranged in bearing circumferential direction than radial direction. For the waviness of thrust bearings, the presence of circumferential waviness can improve the load capacity, while radial waviness can reduce the load capacity. With the increase of wavelength, the load capacity and maximum fluid pressure have similar periodic changes, but the change is irregular. More investigations are required regarding the influence of geometrical shape of the waviness and its wavelength on the performance of the bearing.
{"title":"Influence of bearing waviness on the lubrication performances of coupled journal-thrust water-lubricated bearings","authors":"Hengguang Zhang, Jianlin Cai, Tianyou Yang, Shouan Chen, Dongxing Tang, Jiaxu Wang","doi":"10.1088/2051-672X/acdc3f","DOIUrl":"https://doi.org/10.1088/2051-672X/acdc3f","url":null,"abstract":"The purpose of this study is to discuss the effect of the bearing waviness on the lubrication performances of coupled journal-thrust water-lubricated bearings using an elastohydrodynamic lubrication model. The results of the numerical model are compared to the published experimental data to verify the validity of the numerical model. The load capacity and maximum fluid pressure under different parameters of waviness of coupled journal-thrust bearings are calculated by numerical model, and then the influence of the bearing waviness on the performance of coupled journal-thrust water-lubricated bearings is analyzed. The simulation results show that the waviness amplitude has great influence on the bearing performances and the effect becomes increasingly pronounced with the growth of waviness amplitude. For the waviness of journal bearings, the performances are more sensitive to the waviness arranged in bearing circumferential direction than radial direction. For the waviness of thrust bearings, the presence of circumferential waviness can improve the load capacity, while radial waviness can reduce the load capacity. With the increase of wavelength, the load capacity and maximum fluid pressure have similar periodic changes, but the change is irregular. More investigations are required regarding the influence of geometrical shape of the waviness and its wavelength on the performance of the bearing.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"538 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74528383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.1088/2051-672X/acdcad
W. Fu, B. He, W. L. Wu
Transmission small angle x-ray scattering (tSAXS) has been developed as a metrology for the critical dimension (CD) measurements to facilitate integrated circuit (IC) chip fabrications. Synchrotron x-ray sources were used for their high brilliance and a wavelength less than one tenth of a nanometer was chosen for its high penetration power to enable transmission measurements through a silicon wafer with a nominal thickness of 0.7 mm. A major hold back preventing tSAXS from reaching wide applications in IC fabrication is the lack of high brilliance laboratory-based x-ray sources. Within the last few years, even without any major breakthrough in x-ray source technology, this tSAXS metrology has finally been used for 3D NAND and DRAM, i.e., memory chips with tall or high aspect ratio (HAR) architectures. The scattering intensities from HAR structures will be discussed quantitatively in terms of the sample height and the effective longitudinal coherence length of the incident x-ray.
{"title":"The intensity enhancement of transmission small angle x-ray scattering from nanostructures with a high aspect ratio","authors":"W. Fu, B. He, W. L. Wu","doi":"10.1088/2051-672X/acdcad","DOIUrl":"https://doi.org/10.1088/2051-672X/acdcad","url":null,"abstract":"Transmission small angle x-ray scattering (tSAXS) has been developed as a metrology for the critical dimension (CD) measurements to facilitate integrated circuit (IC) chip fabrications. Synchrotron x-ray sources were used for their high brilliance and a wavelength less than one tenth of a nanometer was chosen for its high penetration power to enable transmission measurements through a silicon wafer with a nominal thickness of 0.7 mm. A major hold back preventing tSAXS from reaching wide applications in IC fabrication is the lack of high brilliance laboratory-based x-ray sources. Within the last few years, even without any major breakthrough in x-ray source technology, this tSAXS metrology has finally been used for 3D NAND and DRAM, i.e., memory chips with tall or high aspect ratio (HAR) architectures. The scattering intensities from HAR structures will be discussed quantitatively in terms of the sample height and the effective longitudinal coherence length of the incident x-ray.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"56 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84859211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.1088/2051-672X/acdb89
Dong Yao, Guangfeng Shi, Jingran Zhang, S. Meng
Adhesion is a crucial characteristic of hydrophobic surfaces that significantly impacts their practical applications. This paper proposes an innovative method for preparing a dual-scale micro-nano composite structure surface by combining mechanical ruling and anodic oxidation, which demonstrates great potential in enhancing hydrophobic surface properties. Through the analysis of the influence of micro-groove depth on the adhesion of hydrophobic surfaces, it has been discovered that micro-groove dimensions can be used to control surface adhesion while maintaining hydrophobicity, without complex chemical modifications. These findings present a promising approach for tailoring the properties of hydrophobic surfaces to suit specific applications. Compared with the single-scale micro-groove array structures, the surface roughness of the dual-scale micro-nano composite structures is significantly increased, and the contact angle of the water droplet is significantly increased. At the same time, the hydrophobicity and adhesion of the surface of the dual-scale micro-nano composite structures were analyzed. The results show that after anodizing, the contact angle of the dual-scale micro-nano composite structure surface increases, and the surface adhesion can be controlled by adjusting the structural parameters of the micro-groove and the anodizing process parameters, to ensure that the surface presents hydrophobic property while realizing the controllable adhesion of the hydrophobic surface. In this paper, dual-scale micro-nano composite structures fabricated by the composite method have achieved hydrophobic properties, and the surface adhesion can be effectively controlled by adjusting the processing parameters. This method has certain reference significance for the preparation of the controllable adhesive hydrophobic surface and lays a foundation for the further study of the controllable adhesive hydrophobic surface.
{"title":"An investigation on the adhesion of dual-scale micro-nano composite structure on the surface of aluminum","authors":"Dong Yao, Guangfeng Shi, Jingran Zhang, S. Meng","doi":"10.1088/2051-672X/acdb89","DOIUrl":"https://doi.org/10.1088/2051-672X/acdb89","url":null,"abstract":"Adhesion is a crucial characteristic of hydrophobic surfaces that significantly impacts their practical applications. This paper proposes an innovative method for preparing a dual-scale micro-nano composite structure surface by combining mechanical ruling and anodic oxidation, which demonstrates great potential in enhancing hydrophobic surface properties. Through the analysis of the influence of micro-groove depth on the adhesion of hydrophobic surfaces, it has been discovered that micro-groove dimensions can be used to control surface adhesion while maintaining hydrophobicity, without complex chemical modifications. These findings present a promising approach for tailoring the properties of hydrophobic surfaces to suit specific applications. Compared with the single-scale micro-groove array structures, the surface roughness of the dual-scale micro-nano composite structures is significantly increased, and the contact angle of the water droplet is significantly increased. At the same time, the hydrophobicity and adhesion of the surface of the dual-scale micro-nano composite structures were analyzed. The results show that after anodizing, the contact angle of the dual-scale micro-nano composite structure surface increases, and the surface adhesion can be controlled by adjusting the structural parameters of the micro-groove and the anodizing process parameters, to ensure that the surface presents hydrophobic property while realizing the controllable adhesion of the hydrophobic surface. In this paper, dual-scale micro-nano composite structures fabricated by the composite method have achieved hydrophobic properties, and the surface adhesion can be effectively controlled by adjusting the processing parameters. This method has certain reference significance for the preparation of the controllable adhesive hydrophobic surface and lays a foundation for the further study of the controllable adhesive hydrophobic surface.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"43 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73040105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.1088/2051-672X/acddfe
Lisha Fan, Tianzhen Zhao, Qiangqiang Qian, Y. Zhu, Guolong Wu, Huaping Wu, Lianbo Guo, Jianhua Yao
Biofouling leading to clog is one of the severe issues underwater valve components are facing today. Establishing a superhydrophobic barrier against microorganisms for underwater albronze components is hence of great significance. We demonstrate an all-laser route for superhydrophobic albronze surface fabrication and non-contact microbial diagnostics. Laser-textured albronze surfaces with well-defined periodic valleys and crests exhibit excellent superhydrophobicity with a contact angle up to 151 ± 1° and a contact angle hysteresis of 0.9 ± 0.1°, more than twice that of an original albronze surface (66 ± 2°). The theoretical wettability diagram of water droplets on laser-textured albronze surfaces shows that the surface wettability transits from hydrophilicity towards hydrophobicity as the surface undulation level elevated, matching well with the experimental observation. According to surface chemistry analysis, carbonyl groups on the albronze surfaces are extensively eliminated by laser texturing and vacuum heating treatment, which contributes to the wettability transformation. The anti-fouling performance of the laser-textured albronze surfaces was comparatively studied in chalk ash aqueous solution, starch solution, and microbial suspension, respectively. Laser-induced breakdown spectroscopy was applied for non-contact microbial diagnostics. Greatly enhanced resistance to biofouling on laser-textured albronze surfaces was confirmed. An all-laser route for anti-fouling superhydrophobic albronze surface fabrication and non-contact microbial diagnostics show great promise for next-generation underwater equipment upgrade and on-site monitoring.
{"title":"All-laser route for anti-fouling superhydrophobic albronze fabrication and non-contact microbial detection","authors":"Lisha Fan, Tianzhen Zhao, Qiangqiang Qian, Y. Zhu, Guolong Wu, Huaping Wu, Lianbo Guo, Jianhua Yao","doi":"10.1088/2051-672X/acddfe","DOIUrl":"https://doi.org/10.1088/2051-672X/acddfe","url":null,"abstract":"Biofouling leading to clog is one of the severe issues underwater valve components are facing today. Establishing a superhydrophobic barrier against microorganisms for underwater albronze components is hence of great significance. We demonstrate an all-laser route for superhydrophobic albronze surface fabrication and non-contact microbial diagnostics. Laser-textured albronze surfaces with well-defined periodic valleys and crests exhibit excellent superhydrophobicity with a contact angle up to 151 ± 1° and a contact angle hysteresis of 0.9 ± 0.1°, more than twice that of an original albronze surface (66 ± 2°). The theoretical wettability diagram of water droplets on laser-textured albronze surfaces shows that the surface wettability transits from hydrophilicity towards hydrophobicity as the surface undulation level elevated, matching well with the experimental observation. According to surface chemistry analysis, carbonyl groups on the albronze surfaces are extensively eliminated by laser texturing and vacuum heating treatment, which contributes to the wettability transformation. The anti-fouling performance of the laser-textured albronze surfaces was comparatively studied in chalk ash aqueous solution, starch solution, and microbial suspension, respectively. Laser-induced breakdown spectroscopy was applied for non-contact microbial diagnostics. Greatly enhanced resistance to biofouling on laser-textured albronze surfaces was confirmed. An all-laser route for anti-fouling superhydrophobic albronze surface fabrication and non-contact microbial diagnostics show great promise for next-generation underwater equipment upgrade and on-site monitoring.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"2 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81887271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-06-01DOI: 10.1088/2051-672X/acdaaf
I. Celik, F. Erdemir, Isa Coruhlu
Aluminum 5754 alloy appears as a candidate material for many engineering applications in terms of its lightness and strength values. The surface properties of this alloy need to be improved for applications where there is surface damage such as friction and wear. In this study, Central composite design was applied to investigate the influences of anodic coating process parameters (voltage, coating time and grit size) on the response (i.e. surface roughness and coating thickness). The competence of the mathematical models recognized, and the importance of the regression coefficients were studied by ANOVA. The initial surfaces of the samples were sanded with 400, 800 and 1200 grit size and surfaces with 3 different roughnesses were obtained. Al 5754 specimens were anodic coated at 8 V, 12 V and 16 V voltages and combinations of time parameters of 10, 20 and 30 min The ANOVA results show that the designed models by RSM for average coating thickness and surface roughness are statistically important at the confidence level of 95%, and 80%, respectively. Maximum anodic coated layer of 29 μm was obtained at surface prepared with 1200 grit size, at 16 V of voltage and used for 30 min of anodizing time. The lowest roughness value of 0.676 μm was obtained at the surface was prepared with 1200 grit size, 8 V of voltage and anodizing time of 10 min.
{"title":"Experimental analysis of anodic coating process parameters of Al 5754 alloy by response surface method","authors":"I. Celik, F. Erdemir, Isa Coruhlu","doi":"10.1088/2051-672X/acdaaf","DOIUrl":"https://doi.org/10.1088/2051-672X/acdaaf","url":null,"abstract":"Aluminum 5754 alloy appears as a candidate material for many engineering applications in terms of its lightness and strength values. The surface properties of this alloy need to be improved for applications where there is surface damage such as friction and wear. In this study, Central composite design was applied to investigate the influences of anodic coating process parameters (voltage, coating time and grit size) on the response (i.e. surface roughness and coating thickness). The competence of the mathematical models recognized, and the importance of the regression coefficients were studied by ANOVA. The initial surfaces of the samples were sanded with 400, 800 and 1200 grit size and surfaces with 3 different roughnesses were obtained. Al 5754 specimens were anodic coated at 8 V, 12 V and 16 V voltages and combinations of time parameters of 10, 20 and 30 min The ANOVA results show that the designed models by RSM for average coating thickness and surface roughness are statistically important at the confidence level of 95%, and 80%, respectively. Maximum anodic coated layer of 29 μm was obtained at surface prepared with 1200 grit size, at 16 V of voltage and used for 30 min of anodizing time. The lowest roughness value of 0.676 μm was obtained at the surface was prepared with 1200 grit size, 8 V of voltage and anodizing time of 10 min.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"4 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81138691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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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