Carbonate-Melt Oxidized Iridium Wire for pH Sensing

2003 ◽  
Vol 15 (20) ◽  
pp. 1606-1615 ◽  
Author(s):  
Min Wang ◽  
Sheng Yao
Keyword(s):  
Ph Sensing ◽  
Iridium Wire ◽  
Carbonate Melt

Production and isolation of pH sensing materials by carbonate melt oxidation of iridium and platinum

2012 ◽  
Vol 22 (16) ◽  
pp. 7782 ◽  
Author(s):  
Matthew J. O'Malley ◽  
Patrick M. Woodward ◽  
Henk Verweij
Keyword(s):  
Ph Sensing ◽  
Carbonate Melt

Hybrid Micro-Optical Sensors via Sol-Gel Soft Lithography

2000 ◽  
Vol 628 ◽  
Author(s):  
Mark A. Clarner ◽  
Michael J. Lochhead
Keyword(s):  
Optical Sensors ◽  
Soft Lithography ◽  
Sol Gel ◽  
Silica Gels ◽  
Ph Sensing ◽  
Ambient Conditions ◽  
Sensor Applications ◽  
Patterned Structures ◽  
Biological Functionality ◽  
Indicator Dyes

ABSTRACTOrganically modified silica gels and dye-doped silica gels have been patterned into micrometer-scale structures on a substrate using micro molding in capillaries (MIMIC). This approach is from a class of elastomeric stamping and molding techniques collectively known as soft lithography. Soft lithography and sol-gel processing share attractive features in that they are relatively benign processes performed at ambient conditions, which makes both techniques compatible with a wide variety of organic molecules, molecular assemblies, and biomolecules. The combination of sol-gel and soft lithography, therefore, holds enormous promise as a tool for microfabrication of materials with optical, chemical, or biological functionality that are not readily patterned with conventional methods. This paper describes our investigation of micro-patterned organic-inorganic hybrid materials containing indicator dyes for microfluidic sensor applications. Reversible colorimetric pH sensing via entrapped reagents is demonstrated in a prototype microfluidic sensor element. Patterned structures range from one to tens of micrometers in cross-section and are up to centimeters in length. Fundamental chemical processing issues associated with mold filling, cracking and sensor stability are discussed.

The Role of Hydrophobicity in the Stability and pH-Switchability of (RXDX)4 and Coumarin-RXDX Conjugate β-Sheets

2020 ◽  
Author(s):  
Ryan Weber ◽  
Martin McCullagh
Keyword(s):  
Biological Imaging ◽  
Ph Sensing ◽  
Hydrophobic Residue ◽  
Ideal Candidate ◽  
Self Assembling ◽  
Sensing Applications ◽  
Β Sheets ◽  
The Stability ◽  
Dynamics Simulations

<p>pH-switchable, self-assembling materials are of interest in biological imaging and sensing applications. Here we propose that combining the pH-switchability of RXDX (X=Ala, Val, Leu, Ile, Phe) peptides and the optical properties of coumarin creates an ideal candidate for these materials. This suggestion is tested with a thorough set of all-atom molecular dynamics simulations. We first investigate the dependence of pH-switchabiliy on the identity of the hydrophobic residue, X, in the bare (RXDX)<sub>4</sub> systems. Increasing the hydrophobicity stabilizes the fiber which, in turn, reduces the pH-switchabilty of the system. This behavior is found to be somewhat transferable to systems in which a single hydrophobic residue is replaced with a coumarin containing amino acid. In this case, conjugates with X=Ala are found to be unstable and both pHs while conjugates with X=Val, Leu, Ile and Phe are found to form stable β-sheets at least at neutral pH. The (RFDF)<sub>4</sub>-coumarin conjugate is found to have the largest relative entropy value of 0.884 +/- 0.001 between neutral and acidic coumarin ordering distributions. Thus, we posit that coumarin-(RFDF)<sub>4</sub> containing peptide sequences are ideal candidates for pH-sensing bioelectronic materials.</p>

Nanoparticle‐Reinforced Silica Gels with Enhanced Mechanical Properties and Excellent pH‐Sensing Performance

2020 ◽  
Vol 37 (2) ◽  
pp. 1900404
Author(s):  
Xinyuan Xie ◽  
Yingshi Deng ◽  
Jiehui Peng ◽  
Shiqi Zheng ◽  
Chezheng Cao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Silica Gels ◽  
Ph Sensing ◽  
Sensing Performance

scholarly journals Structure of the cytoplasmic domain of SctV (SsaV) from the Salmonella SPI-2 injectisome and implications for a pH sensing mechanism

2021 ◽  
Vol 213 (2) ◽  
pp. 107729
Author(s):  
Teige R.S. Matthews-Palmer ◽  
Nayim Gonzalez-Rodriguez ◽  
Thomas Calcraft ◽  
Signe Lagercrantz ◽  
Tobias Zachs ◽  
...  
Keyword(s):  
Cytoplasmic Domain ◽  
Ph Sensing ◽  
Sensing Mechanism

Analytical Modeling of Surface Potential and Figure of Merit Computation for Planar Junctionless pH Sensing BioFET

2021 ◽  
pp. 1-1
Author(s):  
Nawaz Shafi ◽  
Aasif Mohamad Bhat ◽  
Jaydeep Singh Parmar ◽  
Chitrakant Sahu ◽  
Periasamy C
Keyword(s):  
Surface Potential ◽  
Figure Of Merit ◽  
Analytical Modeling ◽  
Ph Sensing

Design and in vivo evaluation of alginate-based pH-sensing electrospun wound dressing containing anthocyanins

2021 ◽  
Vol 28 (2) ◽  
Author(s):  
Ayben Pakolpakçıl ◽  
Bilgen Osman ◽  
Gökhan Göktalay ◽  
Elif Tümay Özer ◽  
Yasemin Şahan ◽  
...  
Keyword(s):  
Wound Dressing ◽  
Ph Sensing ◽  
In Vivo Evaluation

scholarly journals Titanium Nitride Thin Film Based Low-Redox-Interference Potentiometric pH Sensing Electrodes

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 42
Author(s):  
Shimrith Paul Shylendra ◽  
Wade Lonsdale ◽  
Magdalena Wajrak ◽  
Mohammad Nur-E-Alam ◽  
Kamal Alameh
Keyword(s):  
Thin Film ◽  
Titanium Nitride ◽  
Orange Juice ◽  
Ph Sensor ◽  
Reference Electrode ◽  
Cost Effective ◽  
Ph Sensing ◽  
Ph Sensors ◽  
Potential Shift ◽  
Double Junction

In this work, a solid-state potentiometric pH sensor is designed by incorporating a thin film of Radio Frequency Magnetron Sputtered (RFMS) Titanium Nitride (TiN) working electrode and a commercial Ag|AgCl|KCl double junction reference electrode. The sensor shows a linear pH slope of −59.1 mV/pH, R2 = 0.9997, a hysteresis as low as 1.2 mV, and drift below 3.9 mV/h. In addition, the redox interference performance of TiN electrodes is compared with that of Iridium Oxide (IrO2) counterparts. Experimental results show −32 mV potential shift (E0 value) in 1 mM ascorbic acid (reducing agent) for TiN electrodes, and this is significantly lower than the −114 mV potential shift of IrO2 electrodes with sub-Nernstian sensitivity. These results are most encouraging and pave the way towards the development of miniaturized, cost-effective, and robust pH sensors for difficult matrices, such as wine and fresh orange juice.

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