Sol–gel-entrapped pH indicator for monitoring pH variations in cementitious materials

Inserra, Barbara; Hayashi, Kaname; Marchisio, Andrea; Tulliani, Jean‐Marc

doi:10.1177/2280800020936540

Cited by 6 publications

(8 citation statements)

References 56 publications

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“…Srinivasan et al used a sol-gel/TNBS (trinitrobenzenesulfonic acid) composite that showed a variation in color in the pH range from 12 to 14 [ 61 ]. Finally, Inserra et al [ 62 ] developed an optical pH probe with a pH-sensitive dye embedded in a silica monolith made by a sol-gel method. Alizarin yellow, which changes color from yellow to red when the pH ranges from 10 to 12, was used for this purpose.…”

Section: Sensors To Evaluate the Carbonation Of Concretementioning

confidence: 99%

New Materials and Technologies for Durability and Conservation of Building Heritage

et al. 2023

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The increase in concrete structures’ durability is a milestone to improve the sustainability of buildings and infrastructures. In order to ensure a prolonged service life, it is necessary to detect the deterioration of materials by means of monitoring systems aimed at evaluating not only the penetration of aggressive substances into concrete but also the corrosion of carbon-steel reinforcement. Therefore, proper data collection makes it possible to plan suitable restoration works which can be carried out with traditional or innovative techniques and materials. This work focuses on building heritage and it highlights the most recent findings for the conservation and restoration of reinforced concrete structures and masonry buildings.

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Section: Sensors To Evaluate the Carbonation Of Concretementioning

confidence: 99%

New Materials and Technologies for Durability and Conservation of Building Heritage

et al. 2023

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“…The development of OFS has expanded in recent years, favoring advances in different areas such as telecommunications [17,18], materials chemistry [19,20], microelectronics [21][22][23], and nanotechnology [24][25][26]. Focusing on the area of chemistry, most of the existing OFS are based on transduction principles such as fluorescence [27][28][29][30] or absorbance [31,32]. In the mentioned cases, the analytical response is achieved by changing the optical properties of a fixed recognition agent on a solid support due to the interaction with the species to be determined.…”

Section: Fundamentalsmentioning

confidence: 99%

“…Chemosensors use molecular recognition mechanism for recognition of an analyte, allowing the occurrence of the signal transduction. The signal produced may be based on the principles of fluorescence [32] or absorbance [33]. These types of molecules add to the OIH membrane's extra optical and electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

et al. 2021

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The use of advanced sensing devices for concrete and reinforced concrete structures (RCS) is considered a rational approach for the assessment of repair options and scheduling of inspection and maintenance strategies. The immediate benefits are cost reduction and a reliable prevention of unpredictable events. The use of optical fiber sensors (OFS) for such purposes has increased considerably in the last few years due to their intrinsic advantages. In most of the OFS, the chemical transducer consists of immobilized chemical reagents placed in the sensing region of the optical sensor by direct deposition or by encapsulation in a polymeric matrix. The choice of the support matrix impacts directly on the performance of the OFS. In the last two decades, the development of OFS functionalized with organic–inorganic hybrid (OIH) sol–gel membranes have been reported. Sol–gel route is considered a simple method that offers several advantages when compared to traditional synthesis processes, allowing to obtain versatile materials with unique chemical and physical properties, and is particularly valuable in the design of OIH materials. This review will provide an update of the current state-of-the-art of the OFS based on OIH sol-gel materials for concrete and RCS since 2016 until mid-2021. The main achievements in the synthesis of OIH membranes for deposition on OFS will be discussed. The challenges and future directions in this field will also be considered, as well as the main limitations of OFS for RCS monitoring.

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“…For example, Jin et al [24] developed a pH potentiometer applicable to teaching in a chemistry laboratory setting. Moreover, a pH sensor to assess the changes in cementitious materials, through a sol-gel process with an alizarin yellow as meter, has been developed [25]. Additionally, portable chemical sensors, requiring specialized processes for manufacturing, have been reported for non-invasive real-time monitoring of parameters for medical care and disease diagnosis [26,27].…”

Section: Introductionmentioning

confidence: 99%

Cost-Effective and Portable Instrumentation to Enable Accurate pH Measurements for Global Industry 4.0 and Vertical Farming Applications

et al. 2022

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Global Vertical Farming (VF) applications with characteristic Industry 4.0 connectivity will become more and more relevant as the challenges of food supply continue to increase worldwide. In this work, a cost-effective and portable instrument that enables accurate pH measurements for VF applications is presented. We demonstrate that by performing a well-designed calibration of the sensor, a near Nernstian response, 57.56 [mV/pH], ensues. The system is compared to a ten-fold more expensive laboratory gold standard, and is shown to be accurate in determining the pH of substances in the 2–14 range. The instrument yields precise pH results with an average absolute deviation of 0.06 pH units and a standard deviation of 0.03 pH units. The performance of the instrument is ADC-limited, with a minimum detectable value of 0.028 pH units, and a typical absolute accuracy of ±0.062 pH units. By meticulously designing bias and amplification circuitry of the signal conditioning stage, and by optimizing the signal acquisition section of the instrument, a (minimum) four-fold improvement in performance is expected.

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Sol–gel-entrapped pH indicator for monitoring pH variations in cementitious materials

Cited by 6 publications

References 56 publications

New Materials and Technologies for Durability and Conservation of Building Heritage

New Materials and Technologies for Durability and Conservation of Building Heritage

Sol-Gel Coating Membranes for Optical Fiber Sensors for Concrete Structures Monitoring

Cost-Effective and Portable Instrumentation to Enable Accurate pH Measurements for Global Industry 4.0 and Vertical Farming Applications

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