Temperature and pH responsive polymers: sensing applications

Gayathri, Varnakumar; Jaisankar, Sellamuthu N.; Samanta, Debasis

doi:10.1080/10601325.2021.1988636

Cited by 14 publications

(3 citation statements)

References 196 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To measure ocean acidity we modified the gold nanostructures with a pH-responsive polyaniline (PANI) polymer. 12 PANI is formed by the oxidative polymerisation of aniline which was then attached to the gold nanostructures with the aid of a surfactant to decrease surface tension. The sensor was exposed to the chemical modifications for 4hrs and any excess was removed by IPA and acetone cleaning.…”

Section: Chemical Surface Modificationsmentioning

confidence: 99%

Nanoplasmonic ecosystem sensors

Govenlock

Boehme²,

Clark³

2023

Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXIII

View full text Add to dashboard Cite

Rapid advances in design, materials, and fabrication technologies over the past decade have allowed scientists to construct novel sensors to map and investigate the marine environment in new ways. This paper investigates the potential of nanoplasmonic sensors to further improve our understanding of marine ecosystems by providing information on pressing physical, chemical, and biological ocean parameters.

show abstract

Section: Chemical Surface Modificationsmentioning

confidence: 99%

Nanoplasmonic ecosystem sensors

Govenlock

Boehme²,

Clark³

2023

Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXIII

View full text Add to dashboard Cite

show abstract

“…Numerous responsive polymer hydrogels feature volume phase transitions (VPT) that result in swelling and contraction in response to even slight changes in the surrounding environment, such as varying temperature, − solvent composition, − salt concentration, − or pH value. − This stimuli-induced phase transition behavior of polymers has been widely studied for their potential applications, e.g., in tissue engineering, − drug delivery, ,− coatings − and soft robotics. − Among these polymer materials, thermoresponsive polymers are well-known for their pronounced sensitivity to small changes in temperature, which causes significant conformational changes (known as the “coil-to-globule” transition) via the absorption or release of water molecules.…”

Section: Introductionmentioning

confidence: 99%

KCl-Modulated Hydration and Subsequent Thermoresponsive Behavior of Poly(sulfobetaine)-Based Diblock Copolymer Thin Films

et al. 2023

View full text Add to dashboard Cite

The KCl-modulated swelling of double thermoresponsive diblock copolymer (DBC) thin films in D2O atmosphere and their subsequent responsive behavior are investigated via spectral reflectance (SR), in situ time-of-flight neutron reflectometry (ToF-NR), and Fourier-transform infrared (FT-IR) spectroscopy. The copolymer consists of a short zwitterionic (poly(4-(N-(3-methacrylamidopropyl)-N,N-dimethylammonio) butane-1-sulfonate)) (PSBP) block and a long non-ionic poly(N-isopropylmethacrylamide) (PNIPMAM) block. DBC thin films are prepared via spin-coating from solutions containing 5 mM or devoid of KCl. The addition of KCl to the DBC thin films leads to a higher swelling ratio and D2O content during vapor treatment with D2O. Upon the subsequent heating of the hydrated DBC films, the films swell further and reach a maximum thickness before contracting. Two separate volume phase transition temperatures (VPTTs) are observed, namely where a further swelling plateau is reached (VPTTfs), and where contraction starts (VPTTc). Based on complementary SR studies of the effect of KCl on the swelling behavior of the respective PSBP and PNIPMAM homopolymer thin films, we conclude that the “further-swelling” period is mainly a consequence of the UCST-type phase transition of PSBP, whereas the “film contraction” period is due to the LCST-type phase transition of PNIPMAM in thin-film geometry. We observe that KCl reduces the VPTTc of the PNIPMAM blocks. Moreover, the salt migrates or aggregates inside the thin film upon heating, thereby forming a KCl enrichment layer in the intermediate section of the film. Furthermore, the observations by FT-IR prove that macroscopic and mesoscopic D2O absorption and desorption are correlated with the effect of KCl on hydration and de-hydration of the hydrophilic groups.

show abstract

“…One current area of study in this context is the development of stimuli-responsive hydrogels. The interest results from their “smartness” in terms of deformation in response to external stimuli, such as heat [ 4 , 5 ], near-infrared light [ 6 , 7 ], pH [ 8 , 9 ], electricity [ 10 , 11 ], chemicals [ 12 , 13 ], and also by multiple stimuli at once [ 14 , 15 , 16 , 17 ]. Thermo-responsivity has gained the most attention, perhaps because temperature is most easily varied.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Thermo-Responsive Controllable Shape-Changing Hydrogel

Luo

Pauer

Luinstra

2022

Gels

View full text Add to dashboard Cite

Temperature response double network (DN) hydrogels comprising a network formed by polymerization of methacrylic acid (MA) modified PVA, N,N’-methylene bis(acrylamide), N-isopropylacryl amide (NIPAM), and one formed from crystalline polyvinyl alcohol (PVA) are prepared in a 3D printed tailor-made mold. The (PVA-MA)-g-PNIPAAm thermoset intermediate is formed in water by a radical, photo-initiated process, and in the presence of dissolved PVA polymers. A subsequent freezing-thawing sequence induces the crystallization of the PVA network, which forms a second network inside the thermoset NIPAM polymer. The prepared hydrogel is thermoresponsive by the phase transition of PNIPAAm segments (T ≈ 32 °C) and has good mechanical properties (tensile strength 1.23 MPa, compressive strength 1.47 MPa). Thermal cycling between room temperature at 40 or 50 °C shows the product converses from a virgin-state to a steady-state, which most likely involves the reorganization of PVA crystals. The swelling-deswelling cycles remain clear at a length change of about 13%.

show abstract

Temperature and pH responsive polymers: sensing applications

Cited by 14 publications

References 196 publications

Nanoplasmonic ecosystem sensors

Nanoplasmonic ecosystem sensors

KCl-Modulated Hydration and Subsequent Thermoresponsive Behavior of Poly(sulfobetaine)-Based Diblock Copolymer Thin Films

Fabrication of Thermo-Responsive Controllable Shape-Changing Hydrogel

Contact Info

Product

Resources

About