JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 7
·e53465
·
IF 3.057
Zhoufeng Wang,Junwei Hu,Bolin Wang,Yingying Liu,Xiubo Long
A series of novel copolyarylates(co-PARs) containing phenol red units in the backbone were synthesized by interfacial polymerization at 10°C from bisphenol A (BPA), phenol red (PR) and diacid chloride monomers. The obtained copolyarylates (co-PARs) are all amorphous, the inherent viscosity ( η inh ) of 0.22–0.62 dl g −1 , and the number- and weight-average molecular weight are 10,200–46,200 and 38,600–203,600, respectively. Adding a small number of PR units to the molecular chains improved the processing fluidity of polyarylates, and the glass transition temperatures ( T g ) decreased from 202.8 to 166.7°C. In addition, the co-PARs have excellent thermal stability with the maximum thermal decomposition temperature of 532.4–545.2°C. The co-PARs show the best mechanical properties (57.6 MPa) when the PR content is 15 mol%. The transmittances of the co-PARs at 400 and 450 nm are 79.2%–97.9% and 87.0%–99.8%, respectively, and the cut-off wavelength is between 320 and 328 nm. The designed and synthesized copolyarylates can be considered as a promising and easy-to-process high-performance engineering plastic.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2023
·Vol. 25
·期 2
·1-14
·
IF 2.5
Ding Jianjun,Ye Li,Su Tong,Guo Naiyu,Yu Linbo,Miao Longxin,Cao Mian,Sun Chao
Surface-enhanced Raman scattering (SERS) features a unique fingerprint spectrum for fast and highly sensitive non-destructive detection without sample pretreatment. Aiming at the problem of few “hot spot” and uneven distribution of traditional SERS substrate, in this work, a surface-enhanced Raman substrate of silica/carbon nanotubes/silver nanoparticles (SiO 2 /CNTs/AgNPs) with high on all sides and low in the middle was synthesized by hydrothermal synthesis. The AgNPs were characterized by transmission electron microscopy (TEM), and the average diameter was 38 nm to 63 nm. The substrate exhibited high sensitivity, stability, and uniformity with a detection limit of 10 −12 M for rhodamine 6G (R6G). Furthermore, we conducted an in-depth research on the enhancement contribution of the substrate by finite-difference time-domain (FDTD); the simulation results were in good agreement with the experimental results. Finally, the substrate was used for the detection of phenol red in water; the results showed that the Raman intensity was exponentially related to the concentration of phenol red solution with the coefficient of determination R 2 = 0.99991, which provided a new method for detecting water pollutants. Graphical Abstract
研究领域:
分析化学
·
环境科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROSCOPY LETTERS
·
2017
·
IF 0.794
Hongliang Wang,Baohua Liu,Zhengguang Li,Lei Yang
Dye leakage and the nonlinear relationship between absorbance and pH affect the pH measurement precision of absorption-based optic sensors and limit their application. Based on the preparation of a transparent sol–gel thin film with a phenol red indicator, this work assumed that the absorbancies had an exponential relationship to the concentrations of the indicator, and the multi-wavelength equation for the pH was derived as follows:
where n is the exponential coefficient, e1, e2, and e3 are the extinction coefficient ratios, and R is the ratio of the absorbancies. The calculation parameters for an immobilized phenol red film were pKa = 8.577, e1 = 0.0191, e2 = 1.530, e3 = 0.2992, and n = 0.6322, while those for an immobilized phenol red/Triton X-100 film were pKa = 8.612, e1 = 0.0507, e2 = 1.501, e3 = 0.3687, and n = 0.3931. The correspondence between the calculated pKa and the pKa from the calibration curve verifies the equation. The calculation parameters remain stable as the indicator content is increased, but change with an increase in the Triton X-100 content. Using the equation, the calculated pH shows stable behavior over a long duration regardless of dye leakage, and the calculated precision is 0.0053. The method provides drift-free and precise water pH measurements for R that is not dependent on the total concentration of the indicator, and can be applied to online monitoring.
研究领域:
分析化学
·
生物医学工程
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DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·
IF 0.936
Jia-Hui ZHAO,Guo-Yong LIU,Shuang WANG,Sha-Sha LU,Jian SUN,Xiu-Rong YANG
Dopamine is a crucial monoamine neurotransmitter involved in multiple cognitive functions and pathological processes. Herein, we described a rapid chromogenic and fluorogenic reaction between dopamine and naphthoresorcinol under ambient conditions, and found that the product possessed intense visible absorbance and high fluorescence quantum yield (78%) in aqueous solution. Through electrospray ionization-mass spectrometry (ESI-MS) and nuclear magnetic resonance (NMR) analysis, the plausible reaction mechanism between dopamine and naphthoresorcinol was deduced, and the structure of the reaction product was confirmed. Inspired by the explicit mechanism and accessible reaction conditions, a straightforward and selective assay for dopamine concentration was developed with colorimetric and fluorescent dual-modal signals based on the in situ reaction.
研究领域:
生物化学
·
分析化学
·
神经科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 38
·e54439
·
IF 3
Zhoufeng Wang,Junwei Hu,Bolin Wang,Yingying Liu,Xiubo Long
A series of novel aromatic copolyesters derived from bisphenol B (BPB) and phenol red (PR) were synthesized by interfacial polymerization. The number- and weight-average molecular weight ( M n and M w ) of the obtained amorphous aromatic copolyesters ranged from 1.06–1.80 × 10 4 to 2.01–6.17 × 10 4 g/mol, respectively. Density functional theory calculations showed that the reactivity of BPB was similar to that of bisphenol A. The reaction activation energy of BPB with terephthaloyl and isophthaloyl chloride (TPC and IPC) was 8.23 kcal/mol, and PR with IPC and TPC was 59.30 kcal/mol. Under the influence of the ethyl side group of BPB and the pendant group of PR, the solubility of the aromatic copolymer was improved, and the glass transition temperature ( T g ) was 125.1–195.3°C, while T max could still be maintained above 525.72°C. The optical transmittance of the copolyesters at 450 nm ( T 450 ) was 69.29%–99.41%, and the tensile strength and Young's modulus were in the range of 46.79–58.59 MPa and 1.39–1.86 GPa respectively. All aromatic copolyesters exhibit good mechanical and processability properties and have great application potential as high-performance plastics.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qian Zhang,Zhuolin Guo,Tuo Li,Beijia Zhao,Jun Dong
Here, we investigate the third-order nonlinear optical (NLO) response of the phenol red (PR) dye solution under cw excitation at 532 nm employing the spatial self-phase modulation (SSPM) method. The results show that two types of diffraction rings (narrow and wide) are produced in the far field , which are attributed to the Kerr effect and Thermal optical nonlinear effect . In addition, the NLO properties of the PR dye under various pH conditions are investigated. Compared with the PR dye solution, the nonlinear refractive index coefficients induced by Kerr effect and Thermal optical nonlinear effect of protonated-PR (P-PR) dye increased by 2.23 and 2.76 times, respectively. These phenomena are explained by the enhanced π-electron delocalization, and the redshift and enhancement of the absorption peak caused by π-π* transitions. Finally, all-optical switching in the PR dye solution is realized based on the Thermal optical nonlinear effect. These findings not only provide a significant reference to tailor nonlinear optical properties of PR dye solutions, but also make PR dye promising candidates in photonic devices applications.
研究领域:
光学材料
·
光子学
·
非线性光学
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分子光谱学
·
功能染料化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ru Liu,Peng Xi,Ning Yang,Bowen Cheng
The complex microenvironment of diabetic wounds often hinders the healing process, ultimately leading to the formation of diabetic foot ulcers and even death. Dual monitoring and treatment of wounds can significantly reduce the incidence of such cases. Herein, a multifunctional Janus membrane (3D chitosan sponge-ZE/polycaprolactone nanofibers-ZP) was developed by incorporating the zinc metal–organic framework, europium metal–organic framework, and phenol red into nanofibers for diabetic wound monitoring and treatment. The directional water transport capacity of the resulting Janus membrane allows for unidirectional and irreversible drainage of wound exudate, and the multifunctional Janus membrane creates up to a 99% antibacterial environment, both of which can treat wounds. Moreover, the pH (5–8) and H2O2 (0.00–0.80 μM) levels of the wound can be monitored using the color-changing property of phenol red and the fluorescence characteristic of Eu-MOF on the obtained membrane, respectively. The healing stages of the wound can also be monitored by analyzing the RGB values of the targeted membrane images. This design can more accurately reflect the wound state and treat the wound to reduce bacterial infection and accelerate wound healing, which has been demonstrated in in vivo experiments. The results provide an important basis for early intervention in diabetic patients.
研究领域:
生物材料学
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医学工程
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Kai Xu,Xuefeng Zhang,Ming Zhang,Lanhe Zhang,Zicheng Chen
The combination of highly hydrophilic plant fiber and water molecule sensitive material can effectively detect the water content in transformer oil. In this study, two types of rapid response cellulose colorimetric papers (Rp and Bp) were fabricated through a simple impregnation method, with cellulosic fiber serving as the substrate, cresol red/thymol blue as the color developer, boric acid as the pH regulator, and silica aerosol as the filler. Rp and Bp were tested and analyzed using various characterization methods, and their performance in detecting bound water content in transformer oil was investigated. The results indicate that Rp changes from magenta to light yellow and Bp changes from lavender to light yellow with the increase of water content of transformer oil. The water content detection accuracy of both is 92 % and 95 %, respectively. The rapid color change of them is due to boric acid's acidity triggering molecular structure changes in the color developers. After six cycles of use, Rp and Bp still exhibited excellent color-changing properties. Therefore, colorimetric papers have the attributes of rapidity, high efficiency, low cost, and desired accuracy, providing an alternative approach for evaluating transformer oil's water content and showing promising application potential.
研究领域:
材料科学
·
分析化学
·
电气工程
·
高分子科学
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 3
·1-8
·
IF 5.705
He Liuying,Lu Yuexiang,Wang Feiyang,Gao Xinxin,Chen Ying,Liu Yueying
The authors describe a colorimetric method for the determination of Hg 2+ ions based on the inhibition of the activity of the enzyme urease. The pH value of solution increases when urease hydrolyzes urea, which can be visualized by adding a pH indicator such as Phenol Red (PhR). Mercaptoethanol as a typical thiol is added to the system to improve selectivity because it binds metal ions and then - unlike the Hg 2+ mercaptoethanol complex - does not inhibit urease. Hence, the color of the pH indicator PhR turns from yellow to pink as the solution becomes alkaline. The Hg 2+ mercaptoethanol complex, in contrast, strongly inhibits urease and the color of the solution remains yellow. The findings were used to design a photometric assay based on the measurement of the ratio of absorptions of PhR at 558 nm and 430 nm. It has a linear response over the 25 to 40 nM Hg 2+ concentration range and a 5 nM detection limit. This is well below the guideline values of Hg 2+ specified by the US Environmental Protection Agency and the World Health Organization for drinking water (10 nM and 30 nM, respectively). The method was employed to the determination of Hg 2+ in water samples spiked with 10 nM levels of Hg 2+ where color changes still can be observed visually.
Schematic presentation of a colorimetric method for the ultrasensitive detection of Hg 2+ based on the inhibition of urease activity. Mercaptoethanol is used to improve the selectivity. Even at Hg 2+ concentrations as low as 5 nM, the color change still can be easily observed by bare eyes.
研究领域:
分析化学
·
环境科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2021
·Vol. 18
·期 5
·1389-1399
·
IF 2.382
Yu Tingting,Cheng Liang,Cai Haocheng,Li Geng,Wang Xu,Kong Linghan,Zhan Jianbo,Wang Hao,Zhang Ying,Yu Zhenhua,Zheng Han
In this study, the fibrous mesoporous silica F-SiO 2 was functionalized with 3-aminopropyltriethoxysilane (APTES). The reversible thermochromic composites of fibrous mesoporous silica (F-SiO 2 ) and amino group-modified fibrous mesoporous silica (F-SiO 2 -NH 2 ) microspheres loaded with cresol red-boric acid (CR-BA) were termed as S2 (F-SiO 2 /CR-BA) and SN2 (F-SiO2-NH 2 /CR-BA), respectively. The materials obtained were characterized by infrared spectroscopy, transmission electron microscopy, scanning and transmission electron microscopy, differential scanning calorimetry, and thermogravimetric analysis. The fibrous morphology of this rigid carrier was maintained after loading with the CR-BA composite system. Owing to the APTES modification, the F-SiO 2 -NH 2 /CR-BA composites underwent more severe color changes than the F-SiO 2 /CR-BA composites. In addition, the F-SiO 2 -NH 2 /CR-BA composites can recover the original color in only 210 s, illustrating excellent reversibility.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Jiao Zhou,Lei Han,Yu Ling,Lei Wang,Nian Bing Li,Hong Qun Luo
Relying on the specific coordination of Ag + and mismatched cytosine-cytosine (C–C), the high-efficiency inhibition of urease by Ag + ion, and the rapid and sensitive response of phenol red to pH, a sensitive ratiometric sensor has been designed for visual detection of human immunodeficiency virus gene (HIV DNA). This sensor utilizes the HIV DNA to initiate catalytic hairpin assembly (CHA) process, releasing Ag + to inhibit subsequent urease-catalyzed urea hydrolysis and prevent the pH of the solution from rising. The CHA process and the absorbance ratio of phenol red at different wavelengths (A 559 /A 432 ) amplify the signal, allowing the sensor to detect HIV DNA from 10 to 130 nM in a sensitive and highly selective manner with a low detection limit of 7.8 nM. In addition, this sensor can visually distinguish different concentrations of HIV DNA within a certain range and possesses a good recovery in 1% of serum samples, which will provide new ideas for biosensor design, dipstick test, blood test, and other clinical disease prevention.
研究领域:
生物技术
·
纳米技术
·
分析化学
·
分子生物学
·
医学诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 2
·1-8
·
IF 5.7
Li Shenghua,Xiao Lingyu,Xiao Longqian,Tan Hongliang
The potential of coordination polymers (CPs) as a host of integrating multiple guest species to construct a fluorescence resonance energy transfer (FRET) nanoprobe was demonstrated. The ZnCPs built from zinc(II) and adenine was employed as a model of CPs to integrate carbon dot (CD) and phenol red (PR) for producing the FRET nanoprobe (CD/PR@ZnCPs). Benefiting from the confinement effect of ZnCPs, the integrated CD and PR can be brought in close proximity to favor the occurrence of FRET process from CD to PR, which leads to the quenching of CD fluorescence. However, the FRET process was disrupted upon the red-shift of PR absorption from 428 to 562 nm in alkaline medium, and consequently switches on the fluorescence of CD/PR@ZnCPs. Based on this finding, by utilizing urease to hydrolyze urea and mediate medium pH, a turn-on fluorescent method was established for the detection of urease activity. This fluorescent method has a linear response that covers 5 to 150 U/L urease with a detection limit of 0.74 U/L and exhibits an excellent selectivity over other enzymes. The successful determination of urease in saliva samples demonstrates the applicability of the fluorescent nanoprobe in complex biological matrix. Graphical Abstract
研究领域:
分析化学
·
生物传感器
·
纳米技术
·
酶学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）