Imprinted sol–gel materials for monitoring degradation products in automotive oils by shear transverse wave

Mujahid, Adnan; Afzal, Adeel; Glanzing, Gerd; Leidl, Anton; Lieberzeit, Peter A.; Dickert, Franz L.

doi:10.1016/j.aca.2010.07.005

Cited by 31 publications

(29 citation statements)

References 14 publications

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“…The MISGs were prepared according to approaches reported by Lieberzeit et al [29,33,35,36,39]. TiO 2 -based MISGs were prepared by dissolving 50 μL of template molecules in 2 mL of isopropanol.…”

Section: Methodsmentioning

confidence: 99%

“…The MISGs-coated QCM electrodes were dried at 130 ℃ for 1h. This process has been reported enough to not only remove the templates from the layer materials but also produce smooth surface [36]. After that, the electrodes were then kept in vacuum at room temperature before the vapor sensing.…”

Section: Methodsmentioning

confidence: 99%

“…Both silicon and titanium alkoxides are used as matrix precursors to fabricate MISGs [28,32,33,34,35,36,37,38,39]. Generally, the Si-based MISGs show advantages in the variety of molecular structures of silicon alkoxides while the Ti-based MISGs show advantages in high sensitivity and thermal stability.…”

Section: Introductionmentioning

confidence: 99%

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Molecularly Imprinted Sol-Gel-Based QCM Sensor Arrays for the Detection and Recognition of Volatile Aldehydes

Liu

Wyszynski

Yatabe

et al. 2017

Sensors

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The detection and recognition of metabolically derived aldehydes, which have been identified as important products of oxidative stress and biomarkers of cancers; are considered as an effective approach for early cancer detection as well as health status monitoring. Quartz crystal microbalance (QCM) sensor arrays based on molecularly imprinted sol-gel (MISG) materials were developed in this work for highly sensitive detection and highly selective recognition of typical aldehyde vapors including hexanal (HAL); nonanal (NAL) and bezaldehyde (BAL). The MISGs were prepared by a sol-gel procedure using two matrix precursors: tetraethyl orthosilicate (TEOS) and tetrabutoxytitanium (TBOT). Aminopropyltriethoxysilane (APT); diethylaminopropyltrimethoxysilane (EAP) and trimethoxy-phenylsilane (TMP) were added as functional monomers to adjust the imprinting effect of the matrix. Hexanoic acid (HA); nonanoic acid (NA) and benzoic acid (BA) were used as psuedotemplates in view of their analogous structure to the target molecules as well as the strong hydrogen-bonding interaction with the matrix. Totally 13 types of MISGs with different components were prepared and coated on QCM electrodes by spin coating. Their sensing characters towards the three aldehyde vapors with different concentrations were investigated qualitatively. The results demonstrated that the response of individual sensors to each target strongly depended on the matrix precursors; functional monomers and template molecules. An optimization of the 13 MISG materials was carried out based on statistical analysis such as principle component analysis (PCA); multivariate analysis of covariance (MANCOVA) and hierarchical cluster analysis (HCA). The optimized sensor array consisting of five channels showed a high discrimination ability on the aldehyde vapors; which was confirmed by quantitative comparison with a randomly selected array. It was suggested that both the molecularly imprinting (MIP) effect and the matrix effect contributed to the sensitivity and selectivity of the optimized sensor array. The developed MISGs were expected to be promising materials for the detection and recognition of volatile aldehydes contained in exhaled breath or human body odor.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Molecularly Imprinted Sol-Gel-Based QCM Sensor Arrays for the Detection and Recognition of Volatile Aldehydes

Liu

Wyszynski

Yatabe

et al. 2017

Sensors

View full text Add to dashboard Cite

show abstract

“…A variety of sensor devices have been proposed to monitor the degradation based on different parameters such as viscosity [3], conductivity [4], and acidity [5]. Further improvements were carried out by introducing molecular recognition properties in sensitive layers to determine the chemical quality of engine oil in gas or liquid phase by employing mass sensitive transducers [6–8]. Recently, dielectric spectroscopy has also been employed to detect the age of used engine oil [9].…”

Section: Introductionmentioning

confidence: 99%

Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil

Latif

Dickert

2011

Sensors

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Conductometric sensors have been fabricated by applying imprinted polymers as receptors for monitoring engine oil quality. Titania and silica layers are synthesized via the sol-gel technique and used as recognition materials for acidic components present in used lubricating oil. Thin-film gold electrodes forming an interdigitated structure are used as transducers to measure the conductance of polymer coatings. Optimization of layer composition is carried out by varying the precursors, e.g., dimethylaminopropyltrimethoxysilane (DMAPTMS), and aminopropyl-triethoxysilane (APTES). Characterization of these sensitive materials is performed by testing against oil oxidation products, e.g., carbonic acids. The results depict that imprinted aminopropyltriethoxysilane (APTES) polymer is a promising candidate for detecting the age of used lubricating oil. In the next strategy, polyurethane-nanotubes composite as sensitive material is synthesized, producing appreciable differentiation pattern between fresh and used oils at elevated temperature with enhanced sensitivity.

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“…Thus, the acoustic wave devices are considered as universal mass-sensitive or gravimetric transducers. These transducers include: (a) the bulk acoustic wave devices such as quartz crystal microbalance (QCM) [28,29]; (b) the surface acoustic wave (SAW) resonators [30,31]; and (c) the shear transverse wave (STW) resonators [32,33], which are frequently studied in a combination with different receptor materials for molecular recognition and biomedical diagnosis. The mass-sensitive biosensors produce direct shift in frequency in the event of receptor-analyte interaction and analyte recognition.…”

Section: Introductionmentioning

confidence: 99%

Gravimetric Viral Diagnostics: QCM Based Biosensors for Early Detection of Viruses

et al. 2017

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Viruses are pathogenic microorganisms that can inhabit and replicate in human bodies causing a number of widespread infectious diseases such as influenza, gastroenteritis, hepatitis, meningitis, pneumonia, acquired immune deficiency syndrome (AIDS) etc. A majority of these viral diseases are contagious and can spread from infected to healthy human beings. The most important step in the treatment of these contagious diseases and to prevent their unwanted spread is to timely detect the disease-causing viruses. Gravimetric viral diagnostics based on quartz crystal microbalance (QCM) transducers and natural or synthetic receptors are miniaturized sensing platforms that can selectively recognize and quantify harmful virus species. Herein, a review of the label-free QCM virus sensors for clinical diagnostics and point of care (POC) applications is presented with major emphasis on the nature and performance of different receptors ranging from the natural or synthetic antibodies to selective macromolecular materials such as DNA and aptamers. A performance comparison of different receptors is provided and their limitations are discussed.

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Imprinted sol–gel materials for monitoring degradation products in automotive oils by shear transverse wave

Cited by 31 publications

References 14 publications

Molecularly Imprinted Sol-Gel-Based QCM Sensor Arrays for the Detection and Recognition of Volatile Aldehydes

Molecularly Imprinted Sol-Gel-Based QCM Sensor Arrays for the Detection and Recognition of Volatile Aldehydes

Conductometric Sensors for Monitoring Degradation of Automotive Engine Oil

Gravimetric Viral Diagnostics: QCM Based Biosensors for Early Detection of Viruses

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