JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Zuyao Fu,Ze Chen,Lingfeng Yang,Hao Wang,Jing Xie,Zhaoyang Ding
The misuse of malachite green (MG) has led to significant water pollution, and its metabolite, leucomalachite green (LMG), poses a serious health risk. Rapid detection of drug residues in aquaculture is crucial for food safety. In this study, the dual-emission fluorescent sensor RhB@Tb-MOF (RhB = Rhodamine B) was synthesized based on fluorescence resonance energy transfer (FRET). MG significantly quenches the fluorescence of RhB and affects the fluorescence of Tb-MOF to different extents, making it a suitable ratiometric fluorescent sensor for sensitive MG detection with a limit of detection (LOD) of 9.6 × 10 −3 μg/mL. Although LMG did not affect the fluorescence of RhB@Tb-MOF, it formed a ratio with the fluorescence of RhB@Tb-MOF due to its intrinsic fluorescence properties, and the LOD was 3.5 × 10 −3 μg/mL. Additionally, increasing MG concentrations shifted the sensing system's color from pink to blue, with a colorimetric LOD of 0.15 μg/mL. This paper introduced a colorimetric/fluorescent dual-mode sensor for MG and LMG detection. Furthermore, this sensor was combined with smart labeling technology to achieve rapid on-site quantification of MG, offering significant potential for broad application.
研究领域:
食品安全
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Yuanzhen Xu,Mengru Zhang,Yuanyuan Pang,Tianyue Zheng,Li Zhang,Zhen Wang,Jingling Yan
In this work, 2,2′,3,3′-biphenyltetracarboxylic dianhydride (3,3′-BPDA) was exploited to produce colorless polyimides (CPIs), and their properties were systematically investigated. High-temperature polycondensation of 3,3′-BPDA with fluorinated diamines enabled the synthesis of CPIs with high molecular weights. The resulting CPIs displayed deficient chain packing owing to the steric hindrance and suppressed formation of charge transfer complexes (CTC), as confirmed by the interchain distances (5.9–6.7 Å). These CPIs were highly soluble in common organic solvents due to the enlarged interchain distances. Depending on the chain rigidity, the glass transition temperatures of the CPIs ranged from 287 to 414 °C. More importantly, these CPIs exhibited outstanding optical properties, with a cut-off wavelength of 355–370 nm, transmittance at 450 nm of 79.6–89.2%, and yellow index of 1.4–13.4.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Zhaohui Lu,Dongpeng Li,Qian Gu,Guangtao Qian,Dandan Li,Chunhai Chen
Two novel diamines 1-(4-aminophenyl)-1,3,3-trimethyl-2,3-dihydro-1H-indene-5-amine and 4-amino- N -(4-(5-(4-aminobenzamide)-1,3,3-trimethyl-2,3-dihydro-1H-inden-1-yl) phenyl) benzamide containing indene and amide groups were successfully designed and synthesized, and a series of colorless polyimides (CPIs) derived from the two diamines with 1,2,4,5-cyclohexanetetracarboxylic dianhydride in various ratios were copolymerized. The introduction of aliphatic ring structures was conducive to the improvement of optical properties, while the incorporation of amide groups improved thermal and mechanical properties. These CPI films exhibited excellent optical properties ( T 400 > 80%), high heat resistance ( T g > 300 °C) and mechanical properties with the synergistic action of the two groups. Furthermore, the effect of the content of amide groups on the intermolecular interaction of CPIs was systematically analyzed. This study provides a fancy method for the development of heat-resistant colorless materials for optical applications. Graphical
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
·
2024
·
IF 12.7
Xiaoshuan Pan,Xiaofei Li,Chao Xiao,Xin Ding,Kang Zheng,Xianglan Liu,Meng Xue,Lin Chen,Yi Gong,Xingyou Tian,Xian Zhang
With the development of dynamic infrared camouflage technology, photothermal infrared camouflage has attracted researchers' attention due to its remote-control capability and fast response speed. However, lots of photothermal fillers for high temperatures will break the flexibility and transparency of the polymer. In this work, transparent photothermal infrared camouflage liquid metal microspheres/colorless polyimide (LM/CPI) films with light programming were fabricated. The polydopamine-coated LM microspheres endow CPI with excellent photothermal effect, achieving a wide range of infrared camouflage from room temperature to 390 °C. Furthermore, the glass transition, residual stress, and the different thermal expansion coefficients endow the LM/CPI film with light programming and light actuation capability. The LM/CPI film can mimic the bending of an arm and the opening and closing of a hook. Combining the light programming capability with the dynamic infrared camouflage ability of the LM/CPI film proposes an infrared camouflage strategy where the position of the camouflage film is changed through light programming while conducting infrared camouflage, thereby targeting the design of deceptive, false targets or altering the camouflaged area. Therefore, the LM/CPI films open up a new strategy for dynamic infrared camouflage, sketching a promising future for them in dynamic infrared camouflage.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 34
·期 10
·105203
·
IF 3.953
Peng-Fei Qian,Jing-Qi Wang,Tao Wang,Xuguo Huai,Wen-Hao Geng,Qiangxia Zhu,Ying Tian,Li-Chao Jing,Ze-Long Bao,Hong-Zhang Geng
Transparent conductive films with high stability were prepared by embedding silver nanowires in colorless polyimide and adding a protective layer of exfoliated graphene. The films exhibit great light transmission and conductivity with a sheet resistance of 22 Ω sq−1 at transmittance of 83%. Due to its special embedded structure, the conductive layer can withstand several peeling experiments without falling off. In addition, the most outstanding advantage is the ultra-high stability of the films, including high mechanical robustness, strong chemical corrosion resistance and high operating voltage capacity. The organic light-emitting diode devices prepared based on this transparent conductive electrode exhibit comparable efficiency to indium tin oxide (ITO) based devices, with C.E.max = 2.78 cd A−1, P−1.E.max = 1.89 lm W−1, EQEmax = 0.89%. Moreover, the efficiencies were even higher than that of ITO devices when the operating voltage of the device exceeds 5 V. The above performances show that the transparent conductive electrode based on this structure has high potential for application in organic electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2024
·
IF 6.7
Ziyi Ye,Yujiao Jiang,Wentong Fan,Xinfeng Zhang,Peng Wu
Oxygen is crucial for many chemical and biological processes, and its facile detection is of great significance in our daily lives. In this study, we report a leucomethylene blue (LMB)-encapsulated hydrogel visual indicator for the detection of both gaseous and dissolved Oxygen (DO). The photosensitization of methylene blue (MB) not only lead to its reduction to colorless LMB but also resulted in hydrogel polymerization, thus allowing the one-step preparation of the LMB-hydrogel. Meanwhile, the photosensitized reduction of MB was quite fast (5000-fold faster than the classical glucose reduction). In this manner, the blue color of MB could be completely decayed within only 1 min. Also, the efficient polymerization triggered by MB photosensitization ensured the rapid preparation of LMB hydrogels within 10 min. By placing the oxygen indicator in air or water, oxygen can specifically oxidize the colorless LMB-hydrogel to the blue MB-hydrogel. When coupled with a smartphone, the oxygen indicator exhibited a linear response to DO in the range 0.23–10 mg/L with a detection limit of 0.077 mg/L. The LMB-hydrogel indicator was successfully explored for visual evaluation of vacuum degree during food packaging. The LMB-hydrogel, with the advantages of low cost, ease of preparation, as well as facile use, is a promising visual indicator for both gaseous and dissolved oxygen, especially for in-house usage.
研究领域:
化学
·
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2022
·Vol. 14
·期 19
·4132
·
IF 4.967
Yao Wang,Xiangfu Liu,Jiulin Shen,Jianqiao Zhao,Guoli Tu
A new series of colorless polyimides (CPIs) with outstanding thermal properties and mechanical properties were fabricated by the copolymerization of a novel dianhydride and 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) with 2,2′-bistrifluoromethyl benzidine (TFDB). The novel dianhydride, 10-oxo-9-phenyl-9-(trifluoromethyl)-9,10-dihydroanthracene-2,3,6,7-tetraacid dianhydride (3FPODA), possessed a rigid semi-alicyclic structure, –CF3and phenyl side groups, and an active carbonyl group. Benefitting from the special structure of 3FPODA, the glass transition temperatures (Tg) of the new CPIs improved from 330 °C to 377 °C, the coefficient of thermal expansion (CTE) decreased from 46 ppm/K to 24 ppm/K, and the tensile strength (TS), tensile modulus (TM), and elongation at break (EB) increased from 84 MPa to 136 MPa, 3.2 GPa to 4.4 GPa, and 2.94% to 4.13% with the increasing amount of 3FPODA, respectively. Moreover, the active carbonyl group of the 3FPODA could enhance the CPI’s adhesive properties. These results render the new dianhydride 3FPODA an ideal candidate monomer for the fabrication of high-performance CPIs.Keywords:colorless polyimide;new dianhydride;coefficient of thermal expansion;glass transition temperatures
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 37
·5364-5376
·
IF 5.582
Zhenghui Yang,Haiquan Guo,Chuanqing Kang,Lianxun Gao
Three novel dianhydride monomers involving amide groups were synthesized and further polymerized with various diamines to afford a series of colorless polyimides (cPI). The resultant cPI films present outstanding optical performance, exceedingly good dimensional stability at high temperature, great film ductility and solution-processability. In particular, chemically imidized AMDA/TFDB has an ultra-low coefficient of thermal expansion value of 5.2 ppm K−A, a relatively high Tg value of 333 °C and large elongation at break of 29%, resulting from its rigid-rod backbone and the formation of hydrogen bonding (–CO⋯NH–) between adjacent molecular chains. Concurrently, it exhibits a high optical transmittance of 87% at a wavelength of 550 nm, a small haze value of 0.71 and low yellow index of 4.29 by reason that the incorporation of bulky trifluoromethyl and cyclohexyl preclude the formation of a charge transfer complex effectively. The high overall performance of the amide-containing cPI films suggests its potential application in the field of flexible OLED displays.
研究领域:
材料科学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Muke Zhang,Yafei Yu,Yang Liu,Liang Chen,Qin Chen,Jinchao Li,Yaping Zhang
Recently, colorless polyimide (CPI) substrates with excellent optical properties, a suitable thermal stability, and a low dielectric constant have become a key factor in the development of wearable and portable flexible electronic devices. A series of branched CPI films has been successfully prepared here by using a self-made triamine (1,3,5-triple (2-trifluoromethyl-4-aminobenzyl) benzene [TFAPOB]). By adjusting the ratio of the cyclopentanone bis-spironorbornane tetracarboxylic dianhydride (CPODA) monomer and the 4,4-(hexafluoroisopropyl)-diphthalic anhydride (6FDA) monomer, an optimal film (CBPI-10) with the highest content of CPODA was obtained. This film could achieve the highest transmittance of 90% at 550 nm and the highest glass transition temperature of 311°C. This result could be explained by the fact that CBPI-10 contained the least amount of trifluoromethyl side groups and the largest amount of alicyclic units, which resulted in the generation of the minimum free volume fraction (according to molecular dynamics simulations) and the disruption of the conjugation effect between the benzene rings. Additionally, it is worth mentioning that the highest dielectric constant of these films was only 2.17, which was significantly higher than those of traditional CPI polymers (2.61–2.72). Consequently, the present study has focused on developing a novel manufacturing scheme for branched CPIs, which is of guidance importance for the design of colorless polymers and the advancement of flexible display technology. Graphical
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Zhengsheng Yang,Huanyong Liu,Peiheng Zhou,Haolan Li,Zhiheng Zou,Guang Yang
Concurrently achieving excellent optical properties, thermal stability, mechanical properties, dimensional stability as well as low dielectric constant of colorless polyimides (CPI) is urgently needed for flexible display and electronics. Here, CPI named PI-5 was designed and synthesized from 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 2,2′-bis(trifluoromethyl) benzidine (TFMB), polyhedral oligomeric silsesquioxane (POSS) based micro-crosslinker and chain end tethered units. For comparison, other PI samples are synthesized by adjusting reactants. PI-5 film has excellent transmittance at 450 nm (92.8%) and yellowness index of 2.43. All PI samples are soluble in organic solvents showing good processability. POSS micro-crosslinker reduces the CTE of PI and POSS termination unit further decreases it to 17.4 ppm K −1 . Meanwhile, PI-5 has glass transition temperature ( T g ) of 356°C, 5 wt% weight-loss temperature of 522°C, tensile strength ( δ max ) of 265 MPa, Young's modulus ( E ) of 7.2 GPa. Additionally, PI-5 shows low dielectric constant ( D k ) and dielectric loss ( D f ) of 2.61 and 0.0072 at 1 MHz, as well as low water absorption value (0.39%). This work provides a new strategy to prepare mechanically robust CPI with enhanced general properties for flexible substrate, optoelectronic and related applications. Graphical
研究领域:
材料科学
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 44
·e53082
·
IF 3.057
Yuanhao Zhang,Yubo Zhou,Zhen Wang,Jingling Yan
Colorless polyimide (CPI) films showed great potential for flexible display applications due to their unique combination of excellent optical transparency, and outstanding thermal and mechanical properties. Herein, a series of colorless poly(amide-imide)s were prepared via a conventional two-step method, using 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA), 4,4′-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), 2,2′-bis(trifluoromethyl)benzidine (TFMB), and 4,4′-diaminobenzanilide (DABA) as the monomers. The thermal, mechanical, and optical properties of these copolymers were optimized by adjusting the molar ratios of these monomers. The amide linkages significantly improved the mechanical properties and dimensional stability of the resultant CPI films due to strong hydrogen bonding interactions. In particular, CPI-f films with monomer compositions of TFMB (50 mol%), DABA (50 mol%), 6FDA (50 mol%), and CBDA (50 mol%) exhibited tensile strength of 177 MPa, modulus of 5.5 GPa, coefficient of thermal expansion value of 18 ppm K −1 , and glass transition temperature of 394°C. Furthermore, the optical properties of these copolymers were well balanced due to the adoption of CBDA, which can suppress the formation of charge transfer complexes. Specifically, these CPI films displayed transmittance at 550 nm of >88%, b * values of <5.5, haze values of <1%. The aforementioned results revealed that copolymerization is an effective strategy to achieve CPIs with excellent comprehensive properties.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 6
·4743-4751
·
IF 2.22
Wang Runfei,Cai Peizhi,Xu Wei,Tan Ruiqin,Shen Wenfeng,Wang Zhaozhao,Chen Guofei,Huang Jian,Fang Xingzhong,Song Weijie
In the past years, transparent film heaters (TFHs) based on silver nanowires (AgNWs) have attracted much attention because of their high transmittance, excellent flexibility, and great thermal response. In this paper, we fabricated flexible TFHs with a sandwich structure composed of Ga-doped ZnO (GZO) and AgNWs on the colorless polyimide (cPI) substrate. The optimized hybrid film exhibited a sheet resistance of 14.6 Ω sq −1 with a transmittance of 79%. Excellent thermal uniformity and heating stability of TFHs were demonstrated. The thermal response tests of the GZO/AgNW/GZO/cPI TFHs showed high saturation temperature (~ 176 ℃) with low input voltage (~ 6 V), fast response time (~ 15 s), and stable heating performance. These results indicate that the flexible TFHs with a GZO/AgNW/GZO sandwich structure have broad potential applications in flexible electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）