Silver nanoparticle-loaded microgel-based etalons for H₂O₂sensing

Abstract

Silver nanoparticle (AgNP)-loaded poly(N-isopropylacrylamide)-co-acrylic acid (pNIPAm-co-AAc)-based microgels were generated and used to make etalons. The etalons were shown to exhibit optical properties that depended on the concentration of H2O2 in solution.

Contrast variation SANS measurement of shell monomer density profiles of smart core–shell microgels

“…[1][2][3][4][5][6][7][8][9][10] This behaviour grants them the adjective smart. The response of these materials has great potential in the context of different applications like smart catalyst carriers, [11][12][13] drug delivery, 14,15 sensors, [16][17][18] optical devices, [19][20][21] responsive surface coatings 22 and actuators 23 or in biomedical applications. 24 Combining two monomers of different transition temperatures in statistical copolymers can be used to tune the swelling transition temperature, [25][26][27][28][29] whereas the subsequent synthesis of core and then shell 27,30-35 may lead to a continuous, linear temperature dependent swelling.…”

Surface‐Bound Microgels for Separation, Sensing, and Biomedical Applications

“…Many other measurement techniques have been developed for low concentration detection of pesticides, oxidants, and Glucose titer Glucose oxidase mediated redox reaction of glucose to gluconic acid Conductivity [62] Crosslinking density mediated reversible microgel swelling QCM [13] Deswelling of microgels induced by glucose binding to phenyl boronic acid Reflectance spectroscopy [88,90] Crosslinking density mediated reversible microgel swelling SPR [10] Peroxide titer Redox detection of myoglobin reducing H 2 O 2 Conductivity [110] Charge mediated reversible microgel swelling Reflectance spectroscopy [12] Crosslinking density mediated reversible microgel swelling Reflectance spectroscopy [223] Antioxidant titer Carbon nanotube mediated redox reaction Conductivity [221] Choline titer Enzymatic degradation of choline triggering redox detection Conductivity [109,215] DNA titer Charge mediated reversible microgel swelling Reflectance spectroscopy [43] IgG titer Charge mediated reversible microgel swelling Reflectance spectroscopy [106] Light Photothermal heating inducing LCST reversible microgel swelling Reflectance spectroscopy [9] Napthol-1 titer Nanoparticle arrangement controlled using microgel self-assembly to optimize SERS detection SPR [216] pH Charge mediated reversible microgel swelling Reflectance spectroscopy [41] Polycation titer Charge mediated reversible microgel swelling Reflectance spectroscopy [41] Progesterone titer Crosslinking density mediated reversible microgel swelling Reflectance spectroscopy [11] Pyrene titer Nanoparticle arrangement controlled using substrate patterning to optimize SERS detection SPR [180] Rhodamine 6G titer Nanoparticle arrangement controlled using substrate patterning to optimize SERS detection SPR [181] Temperature LCST mediated reversible microgel swelling Reflectance spectroscopy [105] Temperature/pH/salt titer LCST or charge mediated reversible microgel swelling QCM [33] www.afm-journal.de www.advancedsciencenews.com…”

“…The presence of H 2 O 2 at concentrations above 0.5 mm oxidized the silver nanoparticles, releasing interchain crosslinks and causing a redshift in the reflectance spectra. [223] Wang et al employed vapor-induced phase separation as a single-step process to entrap P(NIPAm-co-benzo-18-crown-6-acrylamide) microgels within a PES membrane: as in smart gating, the microgels swelled in the presence of lead (Pb 2+ ), decreasing the water flux as lead is introduced at concentrations as low as 10 -9 m. [17] Microgel sensors have also been developed for the detection of gaseous analytes. Mueller et al created a pyrene detector based on 2D monolayer arrays of closely packed Au/PNIPAm core-shell microparticles.…”

Thermoresponsive Behavior of Magnetic Nanoparticle Complexed pNIPAm-co-AAc Microgels

“…Nanoparticles including gold nanoparticles (AuNPs) and magnetic nanoparticles (MNPs) have been widely applied in the development of functional nanosystems for optical modulators [5,22], biosensors [23,24], imaging agents [25], and biological interfacing technology [26]. This suggests that complexation of the nanoparticles with responsive hydrogels allows the development of multipotent materials in a wide range of applications [27][28][29][30][31][32].…”