Surface functionalization of silica nanoparticles to enhance aging resistance of asphalt binder

Karnati, Sidharth Reddy; Oldham, Daniel; Fini, Elham H.; Zhang, Lifeng

doi:10.1016/j.conbuildmat.2019.03.257

Cited by 85 publications

(48 citation statements)

References 47 publications

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“…The inert nature of most commercial polymers and nanomaterials limits their development for specific applications in various industries and, therefore, surface modification must be carried out to improve their adhesion, printing and wetting by bringing a variety of polar and other functional groups on surfaces of polymer and nanostructures. Several surface functionalization methods have been established during the past decades that generally follow a common path: first the binding of primary reactive functional groups to the polymer chain ends at the surface, followed by modifying the reactive surface with active/bioactive agents, hydrophobic and hydrophilic monomers, oligomers or polymers to achieve specific surface characteristics matching the needs of the end use (Karnati et al 2019;Pour et al 2015;Zare et al 2019;Zhou et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Functionalization of polymers and nanomaterials for water treatment, food packaging, textile and biomedical applications: a review

et al. 2020

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The inert nature of most commercial polymers and nanomaterials results in limitations of applications in various industrial fields. This can be solved by surface modifications to improve physicochemical and biological properties, such as adhesion, printability, wetting and biocompatibility. Polymer functionalization allows to graft specific moieties and conjugate molecules that improve material performances. In the last decades, several approaches have been designed in the industry and academia to graft functional groups on surfaces. Here, we review surface decoration of polymers and nanomaterials, with focus on major industrial applications in the medical field, textile industry, water treatment and food packaging. We discuss the advantages and challenges of polymer functionalization. More knowledge is needed on the biology behind cell–polymer interactions, nanosafety and manufacturing at the industrial scale.

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Section: Introductionmentioning

confidence: 99%

Functionalization of polymers and nanomaterials for water treatment, food packaging, textile and biomedical applications: a review

et al. 2020

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“…Asphalt pavement is the most widely used advanced pavement in global pavement construction due to the special properties such as low noise, high comfort and strong repairability [1][2][3]. More than 94% of the 2.7 million miles of paved roads in the United States are surfaced with asphalt [4,5]. In terms of existing asphalt pavement construction technology, hot mix asphalt (HMA) is a main technology [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on Physical, Rheological Thermal and Microscopic Characteristics of Water-Foamed Asphalt under Three Environmental Conditions

Guo

Li³

et al. 2020

Coatings

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Applications of water-foamed binders have received widespread attention due to its environmental and economic benefits. This study aims to evaluate the properties of water-foamed asphalt under three environmental conditions (high-temperature evaporation, low-temperature frozen and the freeze–thaw cycle). Conventional physical properties tests, dynamic shear rheometer test (DSR), differential scanning calorimetry test (DSC) and scanning electron microscope test (SEM) are employed to assess the physical, rheological thermal and microscopic characteristics of samples. Conventional physical properties test results showed that the performance of a foamed binder had declined under three environmental processes and the foamed asphalt gradually returned to the characteristics before being foamed, with the increase of process time. A comprehensive evaluation index, deterioration degree was proposed based on the test results and entropy theory, and the deterioration process of the foamed binder under three environmental conditions was quantified. Moreover, freeze–thaw (F–T) cycles had been proved to have the most significant influence on the performance of a foamed binder among three environmental factors, which was a key issue that limits the application and promotion of foamed asphalt in seasonal frozen regions. The DSR test showed that the resistance to high-temperature permanent deformation of the foamed binder was improved after F–T cycles, and the fatigue resistance became worse. The sensitivity analysis of complex modulus and frequency illustrated that foamed asphalt after F–T cycles were more sensitive to the loading frequency and less sensitive to the temperature. The DSC test indicated that the thermal stability of foamed asphalt was improved after F–T cycles. The disappearance of circular “cavitation” observed through SEM test revealed that moisture of foamed asphalt was gradually precipitated and self-healing phenomenon occurred during F–T cycles.

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“…A recent study reported that NH 2 @SNP: silica nanoparticles functionalized with APTES (3aminopropyltriethoxysilane), can effectively improve bitumen resistance to oxidation and mechanical stresses, while reducing the agglomeration phenomena observed with pristine SNPs. Up to 4 wt% of modified SNPs were dispersed in bitumen without observing any agglomeration process [11].…”

Section: Introductionmentioning

confidence: 99%

Functionalization and Modification of Bitumen by Silica Nanoparticles

et al. 2020

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A study on the effect of silica nanoparticles (SNPs) dispersion in bitumen is herein reported. First, the size of the nanoparticles was finely tuned by controlling the experimental conditions during their synthesis, obtaining spherical SNPs with diameter ranging from 95 up to 900 nm. Subsequently, SNPs were embedded with peripheral amine groups by using APTES (3-aminopropyltriethoxysilane) as functionalized agent (NH2@SNP), and ultimately long alkyl chains were grafted by reacting the free amine with an alkylated aldehyde (C14N@SNP). All SNPs (ca. 1 wt%.) were dispersed in bitumen to probe their effect on the rheological properties of bitumen. No significant change in the thermorheological properties of bitumen was observed upon varying the size of the SNPs. Slight improvement was observed when using NH2@SNPs, while the best results were obtained by using C14N@SNPs, showing the crucial role that hydrophobic substituents play in bitumen binders which leads to significant improvements.

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Surface functionalization of silica nanoparticles to enhance aging resistance of asphalt binder

Cited by 85 publications

References 47 publications

Functionalization of polymers and nanomaterials for water treatment, food packaging, textile and biomedical applications: a review

Functionalization of polymers and nanomaterials for water treatment, food packaging, textile and biomedical applications: a review

Laboratory Investigation on Physical, Rheological Thermal and Microscopic Characteristics of Water-Foamed Asphalt under Three Environmental Conditions

Functionalization and Modification of Bitumen by Silica Nanoparticles

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