CO2-responsive poly(N,N-dimethylaminoethyl methacrylate) hydrogels with fast responsive rate

Li, Xiaoying; Xie, Rui; Luo, Feng; Jia, Zhi-Han; Shi, Kun; Ju, Xin; Wang, Wei; Liu, Zhuang; Chu, Liang‐Yin

doi:10.1016/j.jtice.2018.03.006

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…Their coefficients of variation are, respectively, 9.2% and 9.7%, which are calculated according to the ref. [19]. The coefficient of variation values are close to those of Fe 3 O 4 nanoclusters with similar sizes reported by the ref.…”

Section: Resultssupporting

confidence: 87%

Magnetically Assembled Photonic Crystal Gels with Wide Thermochromic Range and High Sensitivity

Jia

Xie

Qiu

et al. 2021

Macromol. Rapid Commun.

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Thermochromic poly(N‐isopropyl acrylamide) (PNIPAM) photonic crystal gels based on 1D magnetically assembling colloidal nanocrystal clusters have attracted much attention due to its convenient preparation process, striking color response, and good mechanical strength. However, there remain challenges to broaden the thermochromic range and improve the sensitivity for their iridescent color display. Here, a PNIPAM photonic gel with wide thermochromic range and high sensitivity is prepared by using four‐arm star poly(ethylene glycol) acrylamide (PEGAAm) as cross‐linker at appropriately reduced magnetic field strength as well as cross‐linker content. PEGAAm improves the homogeneity of the microstructure in PNIPAM photonic gel and thus maintains the structure colors at a wide temperature range from room temperature to 44 °C. The reduced magnetic field strength of 70 Gs and low cross‐linker content (the molar ratio of monomer to cross‐linker of 300:1) lead to a large initial lattice spacing of the photonic gel and thus wide diffraction wavelength migration of 194 nm. This optimized PNIPAM gel exhibits vivid iridescent colors from orange–red to indigo blue as temperature increases from 20 to 44 °C with satisfactory repeatability. Therefore, it may be an ideal candidate for temperature sensors and displays with utility and accuracy such as low‐temperature burns.

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Section: Resultssupporting

confidence: 87%

Magnetically Assembled Photonic Crystal Gels with Wide Thermochromic Range and High Sensitivity

Jia

Xie

Qiu

et al. 2021

Macromol. Rapid Commun.

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“…However, tertiary amine groups are moderate bases (p K aH = 6–7), resulting in good switchability (easy to protonate and have good reversibility) compared to amidine and guanidine groups . Of the many amine-functionalized polymers (AFPs), polyethyleneimine (PEI), , poly( N , N -dimethylaminoethyl methacrylate) (pDMAEMA), − and poly( N , N -diethylaminoethyl methacrylate) (pDEAEMA) , have been explored for CO 2 detection. For example, Han et al recently reported a PEI-functionalized carbon nanotube thin-film sensor capable of CO 2 detection at room temperature, which works based on the acid-base interaction between CO 2 molecules and amine groups of PEI .…”

Section: Introductionmentioning

confidence: 99%

Electrical Response of Poly(N-[3-(dimethylamino)Propyl] Methacrylamide) to CO₂ at a Long Exposure Period

et al. 2022

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Amine-functionalized polymers (AFPs) are able to react with carbon dioxide (CO 2 ) and are therefore useful in CO 2 capture and sensing. To develop AFP-based CO 2 sensors, it is critical to examine their electrical responses to CO 2 over long periods of time, so that the device can be used consistently for measuring CO 2 concentration. To this end, we synthesized poly( N -[3-(dimethylamino)propyl] methacrylamide) (pDMAPMAm) by free radical polymerization and tested its ability to behave as a CO 2 -responsive polymer in a transducer. The electrical response of this polymer to CO 2 upon long exposure times was measured in both the aqueous and solid phases. Direct current resistance measurement tests on pDMAPMAm films printed along with the silver electrodes in the presence of CO 2 at various concentrations reveal a two-region electrical response. Upon continuous exposure to different CO 2 flow rates (at a constant pressure of 0.2 MPa), the resistance first decreased over time, reaching a minimum, followed by a gradual increase with further exposure to CO 2 . A similar trend is observed when CO 2 is introduced to an aqueous solution of pDMAPMAm. The in situ monitoring of pH suggests that the change in resistance of pDMAPMAm can be attributed to the protonation of tertiary amine groups in the presence of CO 2 . This two-region response of pDMAPMAm is based on a proton-hopping mechanism and a change in the number of free amines when pDMAPMAm is exposed to various levels of CO 2 .

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“…Their size and size distributions were obtained by measuring over 100 particles in the micrographs via the software (OLYMPUS cellSens Standard), and the CV values were calculated according to. [32] The microscopic morphology of the surface and cross-section of the microspheres was characterized by SEM (JSM-7500F, JEOL) under a voltage of 15 kV. These samples were prepared by rapidly freezing the integral microsphere and half of the microsphere (cut open parallel to the external magnetic field in the water) after being immersed in liquid nitrogen for 10 min, and then completely freeze-dried for 24 h and lastly sputter-coated with gold for 120 s. EDS (X-Max N , Oxford Instruments) was equipped on the SEM and FTIR spectrometer (Nicolet iS150, Thermo Scientific) were used to analyze the chemical compositions of freeze-dried photonic microspheres.…”

Section: Methodsmentioning

confidence: 99%

“…Optical micrographs (Figure 3a,c) show that BPNA-3 and PNA-3 droplets are uniform with spherical shapes, and their average sizes are both 387 μm, indicating that the addition of 4 mg mL −1 MCNCs in the precursor almost has no effect on the morphology of droplets. Their size distributions (Figure 3e) demonstrate the satisfactory monodispersity, whose coefficient of variation (CV) [32] values are 1.1% and 1.2% respectively. After polymerization, the obtained BPNA-3 and PNA-3 microspheres remain uniform spherical shape with the similar average sizes of 617 and 616 μm respectively (Figure 3b,d), as well as monodispersity with CV are 1.4% (Figure 3f).…”

Section: Morphology and Microstructure Of Pna Photonic Microspheresmentioning

confidence: 96%

“…Besides, the lattice spacing of the freezedried microspheres are observed to be successively decreased with the increase of temperature in Figure S6g-i (Supporting Information), and is measured as 226, 185, and 107 nm respectively, leading to the blue shift of the corresponding structural colors (Figure 2d). By submitting the measured diffraction wavelength into the Bragg law, [23,32] the calculated lattice spacing of PNA-3 in water at 20, 34, and 50°C is 230, 215, and 180 nm, respectively. Although the lattice spacing values of freeze-dried microspheres are always smaller than the sufficiently swollen ones due to the dehydration, their variation trends are almost the same.…”

Section: Effect Of Am Content On Thermochromic Properties Of Microsph...mentioning

confidence: 99%

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Thermochromic Photonic Crystal Microspheres with Uniform Color Display and Wide Coloration Range

Jia

Xie

et al. 2023

Macromol. Rapid Commun.

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Thermochromic microspheres based on poly(N‐isopropylacrylamide) attract much attention in detection and sensor due to the noticeable color response and fast response rate. However, some issues such as uneven color display and narrow coloration range still limit their practical applications. Herein, novel thermochromic microspheres with homogeneous color displays and wide thermochromic range are designed by combining the microfluidic technology with the magnetically‐induced self‐assembly technique and copolymerizing acrylamide (AM) with N‐isopropylacrylamide. The photonic crystal structure with especially even colors is fast and conveniently constructed by magnetic assembly. The addition of AM makes the microspheres more hydrophilic and thus leading to a broader coloration range. The relationship between the structural color display and both the microstructures of photonic crystals and the thermo‐responsive properties of gel matrix are elucidated. The detectable temperature of microspheres rises to as high as 60°C, and displays bright iridescent color variations from orange to blue‐violet in the heating process. Importantly, their shrinking or swelling equilibrium can be reached in 80 and 105 s. Such microspheres are successfully used to visually indicate the appropriate temperature of enzymatic reaction, and have great potential in practical applications such as visual temperature detection and efficiency monitoring of chemical reactions.

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CO2-responsive poly(N,N-dimethylaminoethyl methacrylate) hydrogels with fast responsive rate

Cited by 15 publications

References 30 publications

Magnetically Assembled Photonic Crystal Gels with Wide Thermochromic Range and High Sensitivity

Magnetically Assembled Photonic Crystal Gels with Wide Thermochromic Range and High Sensitivity

Electrical Response of Poly(N-[3-(dimethylamino)Propyl] Methacrylamide) to CO₂ at a Long Exposure Period

Thermochromic Photonic Crystal Microspheres with Uniform Color Display and Wide Coloration Range

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CO2-responsive poly(N,N-dimethylaminoethyl methacrylate) hydrogels with fast responsive rate

Cited by 15 publications

References 30 publications

Magnetically Assembled Photonic Crystal Gels with Wide Thermochromic Range and High Sensitivity

Magnetically Assembled Photonic Crystal Gels with Wide Thermochromic Range and High Sensitivity

Electrical Response of Poly(N-[3-(dimethylamino)Propyl] Methacrylamide) to CO2 at a Long Exposure Period

Thermochromic Photonic Crystal Microspheres with Uniform Color Display and Wide Coloration Range

Contact Info

Product

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Electrical Response of Poly(N-[3-(dimethylamino)Propyl] Methacrylamide) to CO₂ at a Long Exposure Period