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Delft University of Technology
1.
Noodelijk, Reinoudt (author).
High-precision control for Constant Distance Scanning Electrochemical Microscopy.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:371d0292-51ba-4b94-b1b0-adb355af23b0 
► This Report covers the initial research into modeling the Scanning Electrochemical Microscopy (SECM) system for the purposes of high precision control. The SECM system is…
(more)
▼ This Report covers the initial research into modeling the Scanning Electrochemical Microscopy (SECM) system for the purposes of high precision control. The SECM system is a microscope based around electro-chemical effects. It operates in several modes relating on degrees of conductivity of the involved elements. The control is to be based on the observed additional damping the system experiences in control critical conditions. The improvement of this control is necessary to improve the precision and resolution of the system as well as gaining insight in its physical function. Experiments where conducted using an industry setup of the system. This time with the system was used gather data important for model generation as well as requiring intuition on the intricacies of using the system and what type of precision can be used. Next, mathematical descriptions are developed for all elements of the \ac{SECM} system. First of the electrical components involved in the measurement and subsequently of the physics effecting the system. The approximations are picked with the goal of developing a state space model and maintaining a link to the physical world in its parameters. The most complex and relevant being the effect of hydrodynamic damping which is critical in the observed damping process. It is modeled in the Lagrangian Energy approach, which captures only a part of the dynamics. Some additional factors are still missing. A departure from the homogeneous nature of the model is suggested. Experience with the system has led to increased insight into the systems behavior under various conditions and has provided a stepping stone towards more intricate future modeling attempts. While also providing inspiration for possible model free approaches.
Advisors/Committee Members: Baldi, Simone (mentor), Gonzalez Garcia, Yaiza (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: SECM; Modeling; Control; vibration; damping
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APA (6th Edition):
Noodelijk, R. (. (2017). High-precision control for Constant Distance Scanning Electrochemical Microscopy. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:371d0292-51ba-4b94-b1b0-adb355af23b0
Chicago Manual of Style (16th Edition):
Noodelijk, Reinoudt (author). “High-precision control for Constant Distance Scanning Electrochemical Microscopy.” 2017. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:371d0292-51ba-4b94-b1b0-adb355af23b0.
MLA Handbook (7th Edition):
Noodelijk, Reinoudt (author). “High-precision control for Constant Distance Scanning Electrochemical Microscopy.” 2017. Web. 22 Apr 2021.
Vancouver:
Noodelijk R(. High-precision control for Constant Distance Scanning Electrochemical Microscopy. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:371d0292-51ba-4b94-b1b0-adb355af23b0.
Council of Science Editors:
Noodelijk R(. High-precision control for Constant Distance Scanning Electrochemical Microscopy. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:371d0292-51ba-4b94-b1b0-adb355af23b0
Delft University of Technology
2.
Rath, Vineet (author).
Smart controlled-release of corrosion inhibitors for improved corrosion performance of coated metallic parts in automotive.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b2af9a8c-d96f-4e01-b668-fe001a9dbae5
► Corrosion on the car underbody can damage critical parts, which poses safety risks. The current corrosion protection methods such as wax, sealers and coatings are…
(more)
▼ Corrosion on the car underbody can damage critical parts, which poses safety risks. The current corrosion protection methods such as wax, sealers and coatings are not effective enough and an advanced form of corrosion protection is desired. Implementation of smart coatings containing corrosion inhibitors can be an effective solution. These corrosion inhibitors should be available at the onset of corrosion and should not react with the coating matrix. The present study deals with implementation of a corrosion inhibitor into a coating over two metallic substrates used in the car underbody. After the initial breakdown of inhibitor particles into finer sizes, encapsulation using a novel technique was performed to prevent interaction of inhibitor with the coating matrix. This encapsulated inhibitor was further studied to understand its release characteristics under the influence of corrosive pH. Finally, electrochemical performance (EIS and SST) of coated samples containing encapsulated inhibitor was studied with respect to bare inhibitor and no inhibitor coatings. Addition of the encapsulated inhibitor improved corrosion performance. Differences were found in the inhibitor release and protection efficiency for both the substrates.
Mechanical Engineering
Advisors/Committee Members: Gonzalez Garcia, Yaiza (mentor), Schoukens, Ine (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: corrosion; car underbody; smart coatings; inhibitors; encapsulation; EIS; SST
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APA (6th Edition):
Rath, V. (. (2019). Smart controlled-release of corrosion inhibitors for improved corrosion performance of coated metallic parts in automotive. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b2af9a8c-d96f-4e01-b668-fe001a9dbae5
Chicago Manual of Style (16th Edition):
Rath, Vineet (author). “Smart controlled-release of corrosion inhibitors for improved corrosion performance of coated metallic parts in automotive.” 2019. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:b2af9a8c-d96f-4e01-b668-fe001a9dbae5.
MLA Handbook (7th Edition):
Rath, Vineet (author). “Smart controlled-release of corrosion inhibitors for improved corrosion performance of coated metallic parts in automotive.” 2019. Web. 22 Apr 2021.
Vancouver:
Rath V(. Smart controlled-release of corrosion inhibitors for improved corrosion performance of coated metallic parts in automotive. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:b2af9a8c-d96f-4e01-b668-fe001a9dbae5.
Council of Science Editors:
Rath V(. Smart controlled-release of corrosion inhibitors for improved corrosion performance of coated metallic parts in automotive. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:b2af9a8c-d96f-4e01-b668-fe001a9dbae5
Delft University of Technology
3.
Garg, Vishant (author).
Localised Corrosion Studies on FSW Al-Li alloys: Microstructure Effect.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:608628bf-a1bc-45b3-9d06-574861b513ea
► Al-Li alloys were introduced for the use in aerospace applications due to its many advantages over steel such as its low density, good thermal and…
(more)
▼ Al-Li alloys were introduced for the use in aerospace applications due to its many advantages over steel such as its low density, good thermal and electrical conductivity and corrosion resistance of these alloys. The current generation of Al-Li alloys were developed to replace the currently used AA2024 alloy in commercial airframes, military and space applications. Traditional joining methods cannot be used to join dissimilar aluminium alloys. Thus, friction stir welding (FSW) was used to join the 2 dissimilar Al-Li alloys - AA2099 T83 and AA2060 T8E30 alloys. FSW causes several changes in the microstructure due to the rotational movement of the tool which results in localised plastic deformation and a thermal cycle in the alloys. This leads to 4 distinct zones in the alloys - the stir zone, thermo-mechanically affected zone, heat affected zone, and the base metal. The differences in microstructure is suggested to cause a change in the mechanical properties and localised corrosion behaviour of the alloys. In this work, the localised corrosion behaviour of the friction stir welded Al-Li alloys were investigated. The effect of FSW on the microstructure and corrosion behaviour was also studied. Microstructural characterisation was done for both the alloys and their respective weld zones. Coarse constituent particles were found in all weld zones with a decreasing trend in average size towards the weld centre. Strengthening precipitates such as the T_1 phase particles were observed on the grain boundaries of the alloys. This had a decreasing trend of distribution density towards the weld centre with virtually no precipitates in the SZ. In order to assess the corrosion performance potentiodynamic polarisation, open circuit potential, linear polarisation resistance, and immersion tests were deployed. Furthermore, scanning electron microscopy with energy dispersive X-ray spectroscopy was used to evaluate the morphology and chemical composition of the of the corroded surface. It was found that for the BM and HAZ regions of both alloys, the attack occurred mainly on the grain boundaries which were sites for the T_1 particles. These particles were suggested to be the controlling factor of localised corrosion behaviour in these regions due to their high electrochemical behaviour, which also resulted in almost no passivity in these regions. A large attack site was also observed on the surface of the matrix which was the site of hydrogen evolution during initial immersion time periods. Pits were also formed on the sites of coarse intermetallic particles. For the SZ regions the dominating attack was due to the coarse particles in the matrix. The effect of anodising the surface and sol-gel coating of the surface on the corrosion behaviour was determined in this project. It was found that the anodised layer did enhance the corrosion performance of the alloys. The SZ of the anodised sample was found to be most prone to corrosion compared to the anodised base metals. The sol-gel coating on the surface was also found to increase the…
Advisors/Committee Members: Gonzalez Garcia, Yaiza (mentor), Michailidou, Emina (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Aluminium-Lithium alloys;
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APA (6th Edition):
Garg, V. (. (2020). Localised Corrosion Studies on FSW Al-Li alloys: Microstructure Effect. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:608628bf-a1bc-45b3-9d06-574861b513ea
Chicago Manual of Style (16th Edition):
Garg, Vishant (author). “Localised Corrosion Studies on FSW Al-Li alloys: Microstructure Effect.” 2020. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:608628bf-a1bc-45b3-9d06-574861b513ea.
MLA Handbook (7th Edition):
Garg, Vishant (author). “Localised Corrosion Studies on FSW Al-Li alloys: Microstructure Effect.” 2020. Web. 22 Apr 2021.
Vancouver:
Garg V(. Localised Corrosion Studies on FSW Al-Li alloys: Microstructure Effect. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:608628bf-a1bc-45b3-9d06-574861b513ea.
Council of Science Editors:
Garg V(. Localised Corrosion Studies on FSW Al-Li alloys: Microstructure Effect. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:608628bf-a1bc-45b3-9d06-574861b513ea
Delft University of Technology
4.
Chen, Chongchong (author).
Formation and stability of lithium protective layer for corrosion protection of AA2024-T3 and AA2198-T8 aluminium alloys.
Degree: 2020, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:cc78e71d-b35c-478d-ae62-78dc3e5b5fd9
► As a possible replacement for chromate-based coatings in the aerospace industry, lithium leaching coatings have been widely studied in recent years. The formation mechanism of…
(more)
▼ As a possible replacement for chromate-based coatings in the aerospace industry, lithium leaching coatings have been widely studied in recent years. The formation mechanism of protective layer on AA2024-T3 aluminum alloys has been investigated intensively. In order to explore more possibilities for its application in aerospace industry, AA2198-T8 aluminum alloys is also be considered in research for its unique chemical composition which contains lithium. In this thesis, three kinds of different polymer coatings which are non-inhibiting coating, coating containing Li2CO3 and proprietary industrial Li2CO3-loaded coating XP420 are used. These three polymer coatings were applied on the AA2024-T3 and AA2198-T8 aluminum alloys samples. A defect was artificially made on the these samples. Then the samples were divided into two groups, one group is used directly for the experiment to investigate the formation of protective layer, one week neutral salt spray test were applied to another group in order to form the protective layer in advance and later used for the experiment. The second group is mainly focus on investigating the stability of protective layer. What is more, low volume of electrolyte was used during experiment considering the real environment of coating’s application. The research results showed that: (1) Under low volume electrolyte of 5ml aqueous 0.1M NaCl solution, the protective layer is successfully formed; (2) Li2CO3-loaded coating shows better corrosion inhibition performance compared to the non-inhibiting coating; (3) AA2198-T8 aluminum alloy containing lithium in its element composition further contributes to the formation of protective layer; (4) In general, proprietary industrial Li2CO3-loaded coating XP420 are more stable when exposed to the corrosion condition.
Advisors/Committee Members: Gonzalez Garcia, Yaiza (mentor), Michailidou, Emina (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Coating technology; Corrosion; Electro-chemical Characterization; Lithium
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APA (6th Edition):
Chen, C. (. (2020). Formation and stability of lithium protective layer for corrosion protection of AA2024-T3 and AA2198-T8 aluminium alloys. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:cc78e71d-b35c-478d-ae62-78dc3e5b5fd9
Chicago Manual of Style (16th Edition):
Chen, Chongchong (author). “Formation and stability of lithium protective layer for corrosion protection of AA2024-T3 and AA2198-T8 aluminium alloys.” 2020. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:cc78e71d-b35c-478d-ae62-78dc3e5b5fd9.
MLA Handbook (7th Edition):
Chen, Chongchong (author). “Formation and stability of lithium protective layer for corrosion protection of AA2024-T3 and AA2198-T8 aluminium alloys.” 2020. Web. 22 Apr 2021.
Vancouver:
Chen C(. Formation and stability of lithium protective layer for corrosion protection of AA2024-T3 and AA2198-T8 aluminium alloys. [Internet] [Masters thesis]. Delft University of Technology; 2020. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:cc78e71d-b35c-478d-ae62-78dc3e5b5fd9.
Council of Science Editors:
Chen C(. Formation and stability of lithium protective layer for corrosion protection of AA2024-T3 and AA2198-T8 aluminium alloys. [Masters Thesis]. Delft University of Technology; 2020. Available from: http://resolver.tudelft.nl/uuid:cc78e71d-b35c-478d-ae62-78dc3e5b5fd9
Delft University of Technology
5.
Payens, Heleen (author).
Non-enzymatic electrochemical sensing of glucose with nano-structured and functionalised diamond electrodes.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:ea69c02d-cd70-455e-86a7-24b66e42beb4
► Electrochemical sensing is a powerful tool for the rapid detection of (bio)molecules in fluids, and is frequently used in clinical analysis and diagnostics. Diamond is…
(more)
▼ Electrochemical sensing is a powerful tool for the rapid detection of (bio)molecules in fluids, and is frequently used in clinical analysis and diagnostics. Diamond is arguably the best electrode material for its robustness, wide potential window, very low background current, biocompatibility and self-cleaning features. Nowadays, there is a new trend leading to electrodes getting smaller. One of the current challenges in the development of diamond micro-electrodes is to increase the sensitivity of the diamond electrode, while the electrode’s dimensions decrease. An interesting biomolecule to detect is glucose. 2.8% of the world population suffers from diabetes, these people need to measure their blood sugar level and manage this level by dispensing insulin in their body when needed. A glucose sensor is used to determine the amount of glucose in the blood. Boron-doped diamond (BDD) is an interesting material for the non-enzymatic detection of glucose. In this thesis project, study has been done to the nanostructuring and functionalisation effects on the performance of sensing glucose by using diamond electrodes. Measurements have been done with different types of electrodes: bare BDD, acid cleaned BDD, BDD functionalised with gold nanoparticles, BDD with a nanowire surface structure, and BDD with a nanowire surface structure and gold nanoparticles on top. It was found possible to detect glucose with three of these samples: bare BDD, BDD with gold nanoparticles, and the nanostructured BDD functionalised with the gold nanoparticles. The other two electrode types did not give any reduction/oxidation peaks, which is attributed to the oxygenated surface resulting from their fabrication processes. The three glucose-detecting electrodes showed linear behaviour in a range of 1-10 mM, which is in line with the detection range of glucose in human blood. The sensitivities achieved with bare BDD, BDD with gold nanoparticles, and the nanostructured BDD functionalised with the gold nanoparticles are 0.022, 0.429, and 0.136 mA/mMcm2, respectively. The addition of gold particles improves the sensitivity for glucose substantially and works like an electrocatalyst. Making use of electrocatalysts is an interesting and useful functionalisation for direct non-enzymatic glucose sensing, because sensing glucose with bare BDD is a kinetically very slow process. Results of such high sensitivities for BDD with gold nanoparticles were not published in literature yet, so this is a promising achievement that asks for continuation of research in this field.
Micro and Nano Engineering
Advisors/Committee Members: Buijnsters, Ivan (mentor), Frota Sartori, Andre (mentor), Janssen, Guido (graduation committee), Gonzalez Garcia, Yaiza (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: diamond; BDD; electrodes; sensing; glucose
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APA (6th Edition):
Payens, H. (. (2017). Non-enzymatic electrochemical sensing of glucose with nano-structured and functionalised diamond electrodes. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:ea69c02d-cd70-455e-86a7-24b66e42beb4
Chicago Manual of Style (16th Edition):
Payens, Heleen (author). “Non-enzymatic electrochemical sensing of glucose with nano-structured and functionalised diamond electrodes.” 2017. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:ea69c02d-cd70-455e-86a7-24b66e42beb4.
MLA Handbook (7th Edition):
Payens, Heleen (author). “Non-enzymatic electrochemical sensing of glucose with nano-structured and functionalised diamond electrodes.” 2017. Web. 22 Apr 2021.
Vancouver:
Payens H(. Non-enzymatic electrochemical sensing of glucose with nano-structured and functionalised diamond electrodes. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:ea69c02d-cd70-455e-86a7-24b66e42beb4.
Council of Science Editors:
Payens H(. Non-enzymatic electrochemical sensing of glucose with nano-structured and functionalised diamond electrodes. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:ea69c02d-cd70-455e-86a7-24b66e42beb4
Delft University of Technology
6.
de Vries, Sybren (author).
The effects of space holder size and volume fraction on the geometric characteristics and performance of absorbable iron scaffolds.
Degree: 2019, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:0209806b-6076-4823-b08a-4d77dd19db0a
► Although many studies have been performed on porous absorbable iron scaffolds created by the space holder method, no studies have considered the influence of variations…
(more)
▼ Although many studies have been performed on porous absorbable iron scaffolds created by the space holder method, no studies have considered the influence of variations in space holders on absorbable scaffolds. The present study aimed to clarify the effects of space holder particle size and volume fraction, on the pore structure, resultant mechanical properties and absorbability of iron scaffolds. Spherical iron particles were used as the matrix powder and mixed with coarse and fine rectangular urea space holding particles in volume fractions of 20, 40 and 60%, to create six different scaffolds with the space holder method. Scanning electron microscopy and energy-dispersive X-ray spectroscopy were used to observe the scaffolds surface. Thereafter x-ray microtomography and Archimedes’ tests were used to characterize the scaffolds topology. The absorbability of scaffolds was characterized by potentiodynamic polarization measurements and weight loss measurements after 3 and 11 of days immersion in modified simulated body fluid (m-SBF). Mechanical properties were determined by performing diametral compression of the scaffolds, both before and after immersion in m-SBF. SEM images showed that morphology of the final pores was similar to that of space holder particles. Pores at lower porosities are isolated and become more connective or fully connected at higher porosities. Archimedes’ data showed that space holder fraction was directly related to porosity. Pore connectivity, measured by 휇CT, is higher for fine space holding particles. Until at 60% space holder volume fraction, the high amount of space holder particles agglomerated. Furthermore, it was observed that space holding particles had a large preference to move in a plane perpendicular to the applied compaction pressure. Diametral compression showed that increasing porosity resulted in lower yield strength and elastic modulus of scaffolds. The effects of space holder particle size and immersion time on mechanical properties were less pronounced. PDP measurements showed that the corrosion mechanism of scaffolds did not change due to change in space holder particle size or volume fraction. Weight loss measurements after 3 and 11 day immersion in m-SBF showed that increasing porosity resulted in higher weight loss of scaffolds. Weight loss was marginally affected by space holder particle size. Space holder particle size affected the created pore size and surface area yet also changed the pore connectivity. Similarly, the space holder volume fraction affected the created porosity and pore connectivity yet also changed the pore size and shape. This means that the pore structure not independently changes due to space holder particle size or fraction, but rather as a combination of both. Furthermore, in this study it was mainly the created porosity that influenced the mechanical properties and absorption rate of the scaffold. Space holder particle size did not show the same differentiating results, although this might be caused by agglomerating space holder particles…
Advisors/Committee Members: Zhou, Jie (mentor), Gonzalez Garcia, Yaiza (graduation committee), Hermans, Marcel (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: space holder; iron; scaffold; absorbable; biodegradable
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APA (6th Edition):
de Vries, S. (. (2019). The effects of space holder size and volume fraction on the geometric characteristics and performance of absorbable iron scaffolds. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:0209806b-6076-4823-b08a-4d77dd19db0a
Chicago Manual of Style (16th Edition):
de Vries, Sybren (author). “The effects of space holder size and volume fraction on the geometric characteristics and performance of absorbable iron scaffolds.” 2019. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:0209806b-6076-4823-b08a-4d77dd19db0a.
MLA Handbook (7th Edition):
de Vries, Sybren (author). “The effects of space holder size and volume fraction on the geometric characteristics and performance of absorbable iron scaffolds.” 2019. Web. 22 Apr 2021.
Vancouver:
de Vries S(. The effects of space holder size and volume fraction on the geometric characteristics and performance of absorbable iron scaffolds. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:0209806b-6076-4823-b08a-4d77dd19db0a.
Council of Science Editors:
de Vries S(. The effects of space holder size and volume fraction on the geometric characteristics and performance of absorbable iron scaffolds. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:0209806b-6076-4823-b08a-4d77dd19db0a
Delft University of Technology
7.
Sacristan Civera, Ana (author).
Arsenic migration and water uptake in multilayer painting systems.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:8e25312f-9003-4e67-8c30-5b398eb3e54c
► Orpiment and realgar are yellow and red arsenic sulphide pigments that have been used since antiquity in works of art until the 19thcentury, when their…
(more)
▼ Orpiment and realgar are yellow and red arsenic sulphide pigments that have been used since antiquity in works of art until the 19thcentury, when their use was restricted due to their toxicity. With time, these pigments degrade to form colourless arsenic oxide. Different oxidation states of arsenic (+3 and +5) in the degradation products have been recently found. Moreover, they have been identified throughout the whole painting layout from the panel until the varnish, suggesting the migration of degradation products through the paint layers. Besides changing the aspect, they might change the stability of the painting or painted object. Furthermore, they might represent a potential hazard for conservators when dealing with the work of art. Since a painting is in equilibrium with its environment, there is always water in motion inside the painting. It is therefore believed that the degradation products are migrating via water. However, the migration mechanism is still not well understood. This thesis aims to provide a better insight into the diffusion process of arsenites (As+3) and arsenates (As+5) in materials commonly found in paintings. For this, two different approaches were followed: In one hand, light aged painting reconstructions were analysed with FTIR microscopy and SEM-EDS to asses the effect of different grounds and relative humidity on the migration of arsenic. In all the samples, degradation products were found in the orpiment layer based on the As-O vibration, detected with FTIR microscopy. It was possible to identify arsenic in the ground layer close to the orpiment-ground interface for all samples with both techniques. However, due to the low intensity and the proximity to the interface of the arsenic found in the grounds, no conclusions could be drawn about its migration. On the other hand, in-situ ATR-FTIR spectroscopy and EIS measurements were performed on a set of samples to analyse the water, arsenates and arsenites diffusion through oil and two varnishes (dammar and mastic). The diffusion coefficients of water in oil, dammar and mastic were determined with both techniques. It was found that the water diffuses faster in oil than in the two varnishes. Despite being similar, mastic was found to be less stable than dammar since a decrease in its barrier properties with time was found. The diffusion of arsenates and arsenites in dammar and mastic was studied by EIS and the diffusion coefficients were calculated for the first time. It was found that the diffusion of arsenites in the coatings is faster than arsenates, which is in accordance to the diffusion of these species in water. EIS resulted in a promising technique in the study of diffusion of ions in coatings. Although further research is needed to fully understand the migration mechanism of arsenic in painting systems, this thesis provides a useful insight and a methodology with which the water and ion transport in coatings can be studied.
Advisors/Committee Members: Gonzalez Garcia, Yaiza (mentor), Keune, K (graduation committee), Fockaert, Laura-Lynn (graduation committee), Dik, Joris (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Arsenic; Painitng; Diffusion; EIS; Orpiment; Realgar
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APA (6th Edition):
Sacristan Civera, A. (. (2017). Arsenic migration and water uptake in multilayer painting systems. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8e25312f-9003-4e67-8c30-5b398eb3e54c
Chicago Manual of Style (16th Edition):
Sacristan Civera, Ana (author). “Arsenic migration and water uptake in multilayer painting systems.” 2017. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:8e25312f-9003-4e67-8c30-5b398eb3e54c.
MLA Handbook (7th Edition):
Sacristan Civera, Ana (author). “Arsenic migration and water uptake in multilayer painting systems.” 2017. Web. 22 Apr 2021.
Vancouver:
Sacristan Civera A(. Arsenic migration and water uptake in multilayer painting systems. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:8e25312f-9003-4e67-8c30-5b398eb3e54c.
Council of Science Editors:
Sacristan Civera A(. Arsenic migration and water uptake in multilayer painting systems. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:8e25312f-9003-4e67-8c30-5b398eb3e54c
Delft University of Technology
8.
van Ekeren, Wessel (author).
Development of Silicon Oxide as Electron Selective Passivating Contact Layer in Silicon Heterojunction Solar Cells.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:22b2754b-38c8-4884-8106-db2b0c37ad8a
► Within the photovoltaic industry, a lot of research is done in order to minimize losses which are created during the conversion of solar light to…
(more)
▼ Within the photovoltaic industry, a lot of research is done in order to minimize losses which are created during the conversion of solar light to electrical energy. In a crystalline silicon solar cell light has to pass through several layers before it enters the silicon wafer where the electron-hole pairs are generated. As one can imagine, if more light reaches the active layer, more electron-hole pairs can be generated. It is highly desired that only one layer, the active layer, is absorbing photons of the solar spectrum. The active layers at the sunny side of the silicon wafer should be highly transparent for solar light. In addition to being transparent, these layers should be conductive to extract the generated charge carriers to the metal contacts. Current layers applied at the sunny side are not optimally transparent, so it is still possible to increase the efficiencies in the crystalline silicon solar cells. In this study, doped silicon oxide layers have been explored as a potential more transparent layer for passivation of both the silicon surface and the metal contacts. Two routes for the fabrication of doped silicon oxide layers were investigated: post-oxidation of doped polycrystalline silicon layers and post-doping of in-situ grown silicon oxide layers. To characterize this new type of material, several different measurement techniques have been applied to improve our understanding of Low-Pressure Chemical Vapor Deposition deposited silicon oxide passivating contact layers. It was found that the structure and composition of the layers is very different for these different routes. However, very good and stable surface passivation (minority carrier lifetime of >3ms) can be achieved with both types of silicon oxide layers. Also, sheet resistance measurements have indicated that phosphorus doping in silicon oxides is possible. For better insight into the electrical properties of these layers, further testing in electronic test structures is advised.
Advisors/Committee Members: Bottger, Amarante (mentor), Bronsveld, Paula C P (mentor), Weeber, Arthur (graduation committee), Gonzalez Garcia, Yaiza (graduation committee), Delft University of Technology (degree granting institution).
Subjects/Keywords: Materials science; solar cells
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APA (6th Edition):
van Ekeren, W. (. (2018). Development of Silicon Oxide as Electron Selective Passivating Contact Layer in Silicon Heterojunction Solar Cells. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:22b2754b-38c8-4884-8106-db2b0c37ad8a
Chicago Manual of Style (16th Edition):
van Ekeren, Wessel (author). “Development of Silicon Oxide as Electron Selective Passivating Contact Layer in Silicon Heterojunction Solar Cells.” 2018. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:22b2754b-38c8-4884-8106-db2b0c37ad8a.
MLA Handbook (7th Edition):
van Ekeren, Wessel (author). “Development of Silicon Oxide as Electron Selective Passivating Contact Layer in Silicon Heterojunction Solar Cells.” 2018. Web. 22 Apr 2021.
Vancouver:
van Ekeren W(. Development of Silicon Oxide as Electron Selective Passivating Contact Layer in Silicon Heterojunction Solar Cells. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:22b2754b-38c8-4884-8106-db2b0c37ad8a.
Council of Science Editors:
van Ekeren W(. Development of Silicon Oxide as Electron Selective Passivating Contact Layer in Silicon Heterojunction Solar Cells. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:22b2754b-38c8-4884-8106-db2b0c37ad8a
Delft University of Technology
9.
Li, Meicheng (author).
Effect of intermetallics on the bondline corrosion of clad aluminium alloys.
Degree: 2017, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:155a1f0c-b430-401b-931c-16449bfbf79a
Subjects/Keywords: corroison; clad aluminium; intermetallics
Record Details
Similar Records
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Share »
Record Details
Similar Records
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Li, M. (. (2017). Effect of intermetallics on the bondline corrosion of clad aluminium alloys. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:155a1f0c-b430-401b-931c-16449bfbf79a
Chicago Manual of Style (16th Edition):
Li, Meicheng (author). “Effect of intermetallics on the bondline corrosion of clad aluminium alloys.” 2017. Masters Thesis, Delft University of Technology. Accessed April 22, 2021.
http://resolver.tudelft.nl/uuid:155a1f0c-b430-401b-931c-16449bfbf79a.
MLA Handbook (7th Edition):
Li, Meicheng (author). “Effect of intermetallics on the bondline corrosion of clad aluminium alloys.” 2017. Web. 22 Apr 2021.
Vancouver:
Li M(. Effect of intermetallics on the bondline corrosion of clad aluminium alloys. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 22].
Available from: http://resolver.tudelft.nl/uuid:155a1f0c-b430-401b-931c-16449bfbf79a.
Council of Science Editors:
Li M(. Effect of intermetallics on the bondline corrosion of clad aluminium alloys. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:155a1f0c-b430-401b-931c-16449bfbf79a
. 
Open Access Theses and Dissertations