Responses of Metalloporphyrin‐Based Ion‐Selective Electrodes to pH

Abstract

The ISEs based on [M(tpp)Cl] (M: Al, Ga, In, Mn, Fe; H 2 tpp: tetraphenylporphin) had pH responses across their respective pH ranges, which had some correlation with the pH ranges of the two-phase hydrolysis. Such pH responses are ascribed to the phase boundary potentials relating to the acid-base pairs of [M(tpp) + even in contact with strongly alkaline solutions.

New Developments in Smart Bandage Technologies for Wound Diagnostics

“…A number of research avenues have been explored to counter these issues and both potentiometric [31][32][33][34][35][36][37][38][39][40][41][42][43][44] and voltammetric [ 16-20 , 45-51 ] methodologies have been pursued. In most cases, a functional material containing pH sensitive components is applied to the surface of an appropriate sensor substrate through a variety of methods that include: Adsorption/monolayer, [ 39,48 ] polymer fi lms, [ 36 ] screen printed inks, [ 35,38,40,47 ] covalent attachment, [ 46,47 ] or electrodeposition. [ 32,33,37,[42][43][44]50 ] Screen printed electrochemical sensors have been designed specifi cally for wound pH monitoring applications and shown to be a versatile addition.…”

Mixing of photons with massive spin-two particles in a magnetic field

“…of Eqs. (5)- (6), contains spatial derivatives of the fields, while in the pseudoscalar case the derivatives are with respect to time. This means that we can pass from the propagation eigenstates in vacuum (φ and A i ) to the ones in the magnetic field by performing a transformation which is not a simple rotation.…”

“…All current axion searches are based on detection techniques that exploit the increase in the sensitivity that this mixing phenomenon provides. These searches include haloscopes [3], helioscopes [4,5,6,7,8,9] and laser experiments [10,11,12,13,14,15,16,17,18,19,20] (for a review see Ref. [21]).…”

“…Again, the finding related to the contribution of the helicity-zero component makes this interpretation as natural as the spinless one, in the potential case that effects are found experimentally. However, one should always bare in mind that these couplings are subject to strong constraints not only from astrophysics [4,5,6,7,8,9,32,33,34], which is actually the case of axions, but also from the usually very demanding laboratory searches for long range forces [35,36,37]. Some refined models that evade constraints from astrophysics and/or searches for new long range forces have been developed [38,39,40,41], but they all suffer from some lack of naturalness.…”

Molecular Wiring in Smart Dressings: Opening a New Route to Monitoring Wound pH

“…The implementation of sensor systems within the latter gives rise to numerous concerns where issues over probe size and disposability can be problematic—especially where sample sizes may be limited (as in the case of clinic DFU sampling) or in vivo application is desired. A number of research avenues have been explored to counter these issues and both potentiometric [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ] and voltammetric [ 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ] methodologies have been pursued. In most cases, a functional material containing pH sensitive components is applied to the surface of an appropriate sensor substrate through a variety of methods that include: Adsorption/monolayer [ 20 , 29 ], polymer films [ 17 , 34 ], screen printed inks [ 16 , 19 , 21 , 28 ], covalent attachment [ 27 , 28 ] or electrodeposition [ 13 , 14 , 18 , 23 , 24 , 25 , 33 ].…”