Nanoparticles That “Remember” Temperature
Source abstract
Abstract
Photoresponsive gold nanoparticles dispersed in a solid/frozen matrix provide a basis for sensors that “remember” whether the sample has ever exceeded the melting temperature of the matrix. The operation of these sensors rests on the ability to photoinduce metastable electric dipoles on NP surfaces – upon melting, these dipoles drive NP aggregation, precipitation, and crosslinking. These events are manifested by a pronounced color change.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Advanced biosensing and bioanalysis techniques · Biosensors and Analytical Detection
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
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20. The as‐prepared NPs are initially stabilized with weakly binding DDA (characterized by the equilibrium adsorption constant onto goldKDDA ≈ 102M−1[14]); also there is no excess of DDA in solution (see Supporting Information Section 1). When strongly binding ADT (equilibrium adsorption constant onto goldKADT ≈ 104M−1[13]) is added it displaces DDA from NP surface approximately stoichiometrically. For the NP solutions used in the experiments each particle contains ≈5400 gold atoms and has ≈460 surface binding sites (assuming a binding area of 21.4Å2[15]– thus the concentration of binding sites is ≈0.204mM. It follows that for the ADT concentrations/amounts used (7 μL of 12.6mMADT solution or 8.8 × 10−8mol of thiols; see Supporting Information Section 1) about 4.5% of the surface sites are functionalized and each NP has ≈20 ADT ligands.
21. This is in contrast to commercial sensors (e.g Kodashiro T. US Patent 7063041 2006) in which a solid (e.g wax) impregnated with microscopic particles and covering a colored paper melts thereby exposing the covered layer underneath. Such sensors can be “cheated” in the sense that the precipitated microparticles can be redispersed thermally and/or mechanically and refrozen effectively erasing any trace of theT > TMevent.
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