Structural and chemical analysis of bitumen using time-of-flight secondary ion mass spectrometry (TOF-SIMS)

Lu, Xionggang; Sjövall, Peter; Soenen, Hilde

doi:10.1016/j.fuel.2017.02.090

Cited by 40 publications

(39 citation statements)

References 40 publications

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“…For simplicity, the discussion is limited to relevant aliphatic-aromatic structures, but not other heteroatoms, such as N, O, and S. In the positive-ion spectrum ( Fig. 2A), the ion signals at mass/charge ratio (m/z) 43 ) suggest the presence of a small number of organics in the range of C 19 to C 25 . The phase separation of chemical groups at the crude oil surfaces with temperature was observed in the spatial spectra at m/z 0 to 250 (fig.…”

Section: Introductionmentioning

confidence: 99%

Wax-wetting sponges for oil droplets recovery from frigid waters

et al. 2021

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Energy-efficient recovery of oil droplets from ice-cold water, such as oil sands tailings, marine, and arctic oil spills, is challenging. In particular, due to paraffin wax crystallization at low temperatures, the crude oil exhibits high viscosity, making it difficult to collect using simple solutions like sponges. Here, we report a wax-wetting sponge designed by conforming to the thermoresponsive microstructure of crude oil droplets. To address paraffin wax crystallization, we designed the sponge by coating a polyester polyurethane substrate with nanosilicon functionalized with paraffin-like octadecyl ligands. The wax-wetting sponge can adsorb oil droplets from wastewater between 5° and 40°C with 90 to 99% removal efficacy for 10 cycles. Also, upon rinsing with heptol, the adsorbed oil is released within seconds. The proposed approach of sponges designed to conform with the temperature-dependent microstructure of the crude oils could enable cold water technologies and improve circular economy metrics in the oil industry.

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Section: Introductionmentioning

confidence: 99%

Wax-wetting sponges for oil droplets recovery from frigid waters

et al. 2021

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“…As bitumen consists of a very large numbers of different molecules, it could very well be that an air-cooled surface, and this is the one that is investigated in most studies, is different from the surface composition that adheres to the aggregate. Indications of chemical and microstructural differences between air-cooled and fractured bitumen surfaces have been noted [81,82] and recently microscopy studies have demonstrated differences in bitumen surfaces depending on the type of contact liquid [83]. In addition, also for polymers variations in surface energies depending upon the contact medium have been observed by Awaja et al [84].…”

Section: Discussionmentioning

confidence: 97%

Fundamental Approaches to Predict Moisture Damage in Asphalt Mixtures: State-of-the-Art Review

2020

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Moisture susceptibility is still one of the primary causes of distress in flexible pavements, reducing the pavements’ durability. A very large number of tests are available to evaluate the susceptibility of a binder aggregate combination. Tests can be conducted on the asphalt mixture, either in a loose or compacted form, or on the individual components of an asphalt pavement. Apart from various mechanisms and models, fundamental concepts have been proposed to calculate the thermodynamic tendency of a binder aggregate combination to adhere and/or debond under wet conditions. The aim of this review is to summarize literature findings and conclusions, regarding these concepts as carried out in the CEDR project FunDBits. The applied test methods, the obtained results, and the validation or predictability of these fundamental approaches are discussed.

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“…Previous works have used TOF‐SIMS (time of flight secondary ion mass spectroscopy) to perform chemical characterisation of bitumen based on molecular mass. While TOF‐SIMS has excellent depth resolution (nanoscale) (Sjövall et al ., 2018), the main drawback of TOF‐SIMS for imaging of bitumen is that it operates under vacuum, so to assure stability of a volatile sample like bitumen the sample is normally cooled to –80°C, which is far from the conditions of interest for many applications (Lu et al ., 2017; Lu et al ., 2018). In comparison to AFM, it also has a lower resolution of 1 µm, which is not sufficient to capture all the chemical details of bitumen surface submicron‐structures.…”

Section: Introductionmentioning

confidence: 99%

“…Other works on chemical imaging of bitumen used the s‐SNOM (scattering‐type scanning near‐field optical microscopy) technique, which has a lateral resolution of 10 nm and a depth resolution of ∼1–10 nm (Lu et al ., 2017; Lu et al ., 2018). Previous reports that used s‐SNOM to characterise bitumen found a distinguishable chemical difference between the para and peri domains and showed that concentrations of sulfoxide and carbonyl groups are different in the peri and para domains (Fischer & Cernescu, 2015); however, the IR spectra of these domains are not reported.…”

Section: Introductionmentioning

confidence: 99%

Bitumen surface microstructure evolution in subzero environments

Baheri

Schutzius

Poulikakos

et al. 2020

Journal of Microscopy

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Bitumen is a widely used material employed as a binder in pavement engineering and as a surface sealant in construction. Its surface microstructure and microscale properties have been shown to be temperature-dependent, with effects manifesting themselves on surface composition and texture, including the formation of the visually striking catana 'bee'like structures. Despite the importance of a good performance of bitumen in subzero environments (<0°C), the behaviour of bitumen surface texture and composition at cold temperatures, affecting cracking, degradation and road icing, has received practically no attention. In particular, such knowledge is relevant to world regions experiencing long periods of subzero temperatures during the year. Employing advanced atomic force microscopy combined with infrared spectroscopy (AFM-IR) and an environmental chamber, we demonstrate the ability to characterise surface structure and composition with nanoscale precision for a broad range of temperatures. We show that cooling bitumen to subzero temperatures can have several interesting effects on its surface microtexture, nanotexture and composition, especially on its three surface domains, catana, peri and para. We found that the para domain coarsens and extends to form an interfacial transition domain (characterised by increasing surface roughness with peri domain composition) between the para and peri domains. We show that the catana and peri domains have a similar composition, but have different mechanical and chemical properties compared to the para domain. The essential findings of this work improve our understanding of the behaviour of bitumen in subzero environments, aiding us in our quest towards attaining better road and sealant performance.

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Structural and chemical analysis of bitumen using time-of-flight secondary ion mass spectrometry (TOF-SIMS)

Cited by 40 publications

References 40 publications

Wax-wetting sponges for oil droplets recovery from frigid waters

Wax-wetting sponges for oil droplets recovery from frigid waters

Fundamental Approaches to Predict Moisture Damage in Asphalt Mixtures: State-of-the-Art Review

Bitumen surface microstructure evolution in subzero environments

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