Ratiometric Flapping Force Probe That Works in Polymer Gels was written by Yamakado, Takuya;Saito, Shohei. And the article was included in Journal of the American Chemical Society in 2022.Recommanded Product: 5137-55-3 The following contents are mentioned in the article:
Polymer gels have recently attracted attention for their application in flexible devices, where mech. robust gels are required. While there are many strategies to produce tough gels by suppressing nanoscale stress concentration on specific polymer chains, it is still challenging to directly verify the toughening mechanism at the mol. level. To solve this problem, the use of the flapping mol. force probe (FLAP) is promising because it can evaluate the nanoscale forces transmitted in the polymer chain network by ratiometric anal. of a stress-dependent dual fluorescence. A flexible conformational change of FLAP enables real-time and reversible responses to the nanoscale forces at the low force threshold, which is suitable for quantifying the percentage of the stressed polymer chains before structural damage. However, the previously reported FLAP only showed a negligible response in solvated environments because undesirable spontaneous planarization occurs in the excited state, even without mech. force. Here, we have developed a new ratiometric force probe that functions in common organogels. Replacement of the anthraceneimide units in the flapping wings with pyreneimide units largely suppresses the excited-state planarization, leading to the force probe function under wet conditions. The FLAP-doped polyurethane organogel reversibly shows a dual-fluorescence response under sub-MPa compression. Moreover, the structurally modified FLAP is also advantageous in the wide dynamic range of its fluorescence response in solvent-free elastomers, enabling clearer ratiometric fluorescence imaging of the mol.-level stress concentration during crack growth in a stretched polyurethane film: (a) Synthesis of a segmented polyurethane elastomer (SPU1) that is chem. doped with FLAP1-OH as a force probe. (b) Stress-strain curves of different SPUs. (c) FL spectral change of SPU1 during the tensile test. Photographs of the specimen under UV light are shown on the right side. (d) Absorption spectral change of SPU1 during the tensile test. (e) FL intensity ratio plotted against nominal stress in the tensile test. I533 nm/I472 nm was used as the ratio for SPU1 and SPU1-BC, and I525 nm/I474 nm was used for SPU0. (f) Photographs (RGB) and stress mapping (FL ratio) of the notched SPU1 film. The images were acquired using a hyperspectral camera, and the photographs were reconstructed from the RGB channels (R = 700 nm, G = 545 nm, B = 480 nm). (g) FL spectra averaged over the regions A-C shown in the left panel (bandwidth: 5 nm), and the estimated local stress based on the calibration in the panel (e). Strain rate: 0.17 s-1 for the panels (b-e), and 0.2 min-1 for the panel (f). This study involved multiple reactions and reactants, such as N-Methyl-N,N-dioctyloctan-1-aminium chloride (cas: 5137-55-3Recommanded Product: 5137-55-3).
N-Methyl-N,N-dioctyloctan-1-aminium chloride (cas: 5137-55-3) belongs to organic chlorides. Chlorinated organic compounds are found in nearly every class of biomolecules and natural products including alkaloids, terpenes, amino acids, flavonoids, steroids, and fatty acids. Aliphatic organochlorides are often alkylating agents as chlorine can act as a leaving group, which can result in cellular damage.Recommanded Product: 5137-55-3
Referemce:
Chloride – Wikipedia,
Chlorides – an overview | ScienceDirect Topics