New Plastic Microparticles and Nanoparticles for Fluorescent Sensing and Encoding

Borisov, Sergey; Mayr, Torsten; Karasyov, Alexander A.; Klimant, Ingo; Chojnacki, Paweł; Moser, Christoph; Nagl, Stefan; Schaeferling, Michael; Stich, Matthias I. J.; Kocincová, Anna S.; Wolfbeis, Otto S.

doi:10.1007/4243_2007_013

Cited by 11 publications

(12 citation statements)

References 58 publications

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“…Excess reactive groups can make the nanomaterials more prone to aggregation. 675 Physical entrapment of the indicator and the reference dye is often a method of choice because of its simplicity and reproducibility. Noncovalent dyeing procedures include entrapment during the polymerization process, dyeing after swelling of polymeric beads and coprecipitation.…”

Section: Nanomaterialsmentioning

confidence: 99%

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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This is the first comprehensive review on methods and materials for use in optical sensing of pH values and on applications of such sensors. The Review starts with an introduction that contains subsections on the definition of the pH value, a brief look back on optical methods for sensing of pH, on the effects of ionic strength on pH values and p K a values, on the selectivity, sensitivity, precision, dynamic ranges, and temperature dependence of such sensors. Commonly used optical sensing schemes are covered in a next main chapter, with subsections on methods based on absorptiometry, reflectometry, luminescence, refractive index, surface plasmon resonance, photonic crystals, turbidity, mechanical displacement, interferometry, and solvatochromism. This is followed by sections on absorptiometric and luminescent molecular probes for use pH in sensors. Further large sections cover polymeric hosts and supports, and methods for immobilization of indicator dyes. Further and more specific sections summarize the state of the art in materials with dual functionality (indicator and host), nanomaterials, sensors based on upconversion and 2-photon absorption, multiparameter sensors, imaging, and sensors for extreme pH values. A chapter on the many sensing formats has subsections on planar, fiber optic, evanescent wave, refractive index, surface plasmon resonance and holography based sensor designs, and on distributed sensing. Another section summarizes selected applications in areas, such as medicine, biology, oceanography, bioprocess monitoring, corrosion studies, on the use of pH sensors as transducers in biosensors and chemical sensors, and their integration into flow-injection analyzers, microfluidic devices, and lab-on-a-chip systems. An extra section is devoted to current challenges, with subsections on challenges of general nature and those of specific nature. A concluding section gives an outlook on potential future trends and perspectives.

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Section: Nanomaterialsmentioning

confidence: 99%

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

2020

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“…Many types of QDs are reported to be highly detectable with strong fluorescence at low concentrations [ 148 , 149 , 150 , 151 , 152 , 153 ]. Typical QDs are formed using cadmium or zinc with the latter preferred due to its lower toxicity to humans and the environment [ 154 ].…”

Section: Emerging Techniquesmentioning

confidence: 99%

Current and Emerging Techniques for High-Pressure Membrane Integrity Testing

et al. 2018

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Ideally, pressure driven membrane processes used in wastewater treatment such as reverse osmosis and nanofiltration should provide a complete physical barrier to the passage of pathogens such as enteric viruses. In reality, manufacturing imperfections combined with membrane ageing and damage can result in breaches as small as 20 to 30 nm in diameter, sufficient to allow enteric viruses to contaminate the treated water and compromise public health. In addition to continuous monitoring, frequent demonstration of the integrity of membranes is required to provide assurance that the barrier to the passage of such contaminants is intact. Existing membrane integrity monitoring systems, however, are limited and health regulators typically credit high-pressure membrane systems with only 2 log10 virus rejection, well below their capability. A reliable real-time method that can recognize the true rejection potential of membrane systems greater than 4 log10 has not yet been established. This review provides a critical evaluation of the current methods of integrity monitoring and identifies novel approaches that have the potential to provide accurate, representative virus removal efficiency estimates.

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“…Additionally, the dynamic range can be fine-tuned by the permeability and kind of the polymers used. 42 Finally, the signal of such materials can be easily adjusted by proper variation of the sensor components. Fig.…”

Section: Multisensor Systemsmentioning

confidence: 99%

Multiple fluorescent chemical sensing and imaging

2010

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Optical sensors, unlike most others, enable multiple sensing of (bio)chemical species by making use of probes whose signals can be differentiated by spectral and/or temporal resolution. Multiple sensors are of substantial interest for continuous monitoring of chemical parameters in complex samples such as blood, bioreactor fluids, in the chemical industry, aerodynamic research, and when monitoring food quality control, to mention typical examples. Moreover, such sensors enable non-invasive, non-toxic and online detection. We discuss in this critical review the state of the art in terms of spectroscopic principles, materials (mainly indicator probes and polymers), and give selected examples for dual and triple sensors along with a look into the future (109 references).

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New Plastic Microparticles and Nanoparticles for Fluorescent Sensing and Encoding

Cited by 11 publications

References 58 publications

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications

Current and Emerging Techniques for High-Pressure Membrane Integrity Testing

Multiple fluorescent chemical sensing and imaging

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