NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 5
·2122-2128
·
IF 3.288
Lei Ding,YiFan Chen,Zibo Hua,Li Liu,Haixu Chen,Zhengxiang Zhong,Yunzhe Du,Yudong Huang
ZnO quantum dots@SiO2 (ZnO QDs@SiO2) was synthesized by a modified sol–gel method, and then added to polyvinyl alcohol (PVA) to form an ink-absorbing coating with ultraviolet shielding performance on poly(ethylene terephthalate) (PET) films. A layer of silica encapsulated on the surface of ZnO QDs not only reduces the photocatalytic activity significantly, but also prevents the agglomeration of ZnO QDs in aqueous solution. The UV-vis transmittance spectrum of the as-prepared ink-absorbing coating displayed excellent shielding performance in the ultraviolet region (<355 nm) and high transmittance in the visible region. Even when exposed to 30 W ultraviolet for 100 h, no obvious changes were observed in its UV-vis transmittance spectrum, showing long-term durability. Notably, the ink absorption of the ink-absorbing coating prepared using ZnO QDs@SiO2 is higher than that of the ink-absorbing coating prepared using commercially available silica. Therefore, a durable, highly transparent and ultraviolet shielded inkjet printing coating on PET can be prepared with ZnO QDs@SiO2 nanoparticles.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2016
·
IF 2.653
Wenlong Fan,Ximing Huang,Xiaomin Shi,Zhuo Wang,Zhengliang Lu,Chunhua Fan,Qibing Bo
A big challenge is the discrimination of sulfhydryl-containing amino acids due to their structural similarity. We designed and synthesized a simple fluorescent probe 3 for specific detection of cysteine based on photo-induced electron transfer (PET). The acrylate and BODIPY moieties in probe 3 act as a reaction site and reporter group, respectively. So the synergistic effect of the substituent groups endows probe 3 very strong green fluorescence at 525 nm (λ ex = 500 nm). The cleavage reaction induced by cysteine leads to acrylate hydrolysis, and thereby triggers PET on, which effectively quench the fluorescence of 3 . Probe 3 exhibited a rapid response towards cysteine over homocysteine and glutathione . Probe 3 is successfully applied for sensing and imaging cysteine in vitro or in vivo cells with low cytotoxicity.
研究领域:
生物化学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Teng Li,Shuai Li,Tongjun Ma,Yi Zhong,Linping Zhang,Hong Xu,Bijia Wang,Xueling Feng,Xiaofeng Sui,Zhize Chen,Zhiping Mao
A novel organic-inorganic hybrid polyphosphazene modified manganese hypophosphite (PZS-MnHP) shuttles was facilely fabricated and applied in enhancing the flame retardance and anti-dripping behavior of PET. The PET containing 5 wt% PZS-MnHP shuttles (PET/FR5.0) possessed a LOI value of 25.3% and corresponding melt-dripping was greatly restricted with few droplets. Incorporating 5 wt% PZS-MnHP shuttles also brought about dramatic decrease in the fire hazard of PET, for instance, 57.0% maximum reduction in heat release rate. Moreover, the tensile strength of PET/FR5.0 composite was gradually increased from 50.87 MPa to 55.68 MPa, relevant elongation at break was enhanced by 7.2% compared with that of PET. The flame-retardation mechanism of PZS-MnHP shuttles in PET was also systematically investigated. The results showed PZS-MnHP shuttles extremely accelerated the formation of intumescent char, cutting off the supply of external oxygen and heat. Moreover, inflammable gases including SO 2 and NH 3 released from PZS-MnHP shuttles efficiently diluted combustible organic volatiles in burning area, further blocking the spread of fire.
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
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·
IF 4.7
Yang Ge,Wu Hao,Huang Ke,Ma Yukun,Chen Qi,Chen Yun,Lin Shanshan,Guo Hailing,Li Zhibo
The recycling of polyethylene terephthalate (PET) waste plastics has garnered global attention as an essential area of research to address. Chemical upcycling methods, such as glycolysis, offers a visible solution by directly converting PET wastes into high-valued monomers, enabling their reintegration into the plastic life cycle. However, the recovery of metal salt catalyst and the thermal stability of organic catalyst pose challenges in PET glycolysis. Zeolites with strong Brønsted acid are widely used in the degradation of polyolefins, but in PET glycolysis, they face the problems of acid site mismatch and difficult contact with PET. In this work, nanosized FAU-type zeolite catalysts (100-FAU) were employed to carry out PET glycolysis, which were green synthesized at low temperature without organic template. In comparison to commercial FAU-type catalysts, 100-FAU exhibits enhanced Lewis acidity and basicity along with increased accessibility to active sites. The 100% degradation of PET was achieved within 1 h, resulting in a BHET yield of 64.2%. Prolonging the reaction time to 1.5 h led to an enhanced BHET yield of 72.1%. The quality of the primary product bis(2-hydroxyethyl) terephthalate (BHET) was verified through IR, DSC, and NMR characterizations. Furthermore, as a solid catalyst with high thermal stability, zeolite can be easily recovered via filtration and demonstrated stable performance over at least 5 cycles, and proved effective for glycolysis of commercially waste PET plastics. The acid–base dual-functional catalytic mechanism of Na-form FAU in PET glycolysis was proposed. Under its guidance, the promoting effect of other Na-form nanosized zeolites on PET degradation was verified.
研究领域:
材料科学
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化学工程
·
环境科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2021
·Vol. 98
·期 1
·224-237
·
IF 2.326
Dong Wei,Qian Fuping,Li Qing,Tang Gang,Xiang Tengfei,Chun Tiejun,Lu Jinli,Han Yunlong,Xia Yongjun,Hu Jia
A high moisture content in the flue gas of iron and steel sintering process causes the issue of filter material pasting, which leads to a decrease in the filtration effect and service life of the filter material. Surface modification of the filter materials is a useful strategy for their hydrophobicity enhancement. Therefore, the Sol–gel method was employed to modify the polyethylene glycol terephthalate (PET) filter with tetraethyl orthosilicate(TEOS) as precursor and perfluorodecyl triethoxysilane (PFDTES) as modifier. Field emission scanning electron microscope (FESEM), Fourier transform infrared spectrometer (FT-IR), and contact angle tester were used to characterize the PET filter materials before and after modification, and exhaustive filter efficiency was evaluated by the comprehensive performance test machine. The particle size and distribution of SiO 2 nanoparticles were analyzed using a nanometer particle size analyzer, the effects of TEOS/PFDTES loading on the hydrophobic performance and filtration performance of the filter material have been discussed. Based on the results of these studies, superhydrophobic stability of the filter material was evaluated. The results show that the microscopic pore structure of PET filter materials was retained after modification. TEOS modified PET (T-PET) filter materials were completely wetted with static contact angle (WCA) of 0°. The surface energy of PFDTES modified PET (F-PET) filter materials was reduced, the WCA was 144.6 ± 1.6° and WSA was 7.6 ± 4.5°. For TEOS/PFDTES co-modified PET (TF-PET), the SiO 2 nanoparticles was modified by the long fluorine chain -CH 2 CH 2 (CF 2 ) 7 CF 3 groups, endowing TF-PET with superhydrophobic property. With the increasing of TEOS loading, TF-PET fiber presented significant enhancement of roughness, while average particle size of SiO 2 nanoparticles on the fiber surface gradually decreased. The particle size distribution first increased sharply, and then, slowly decreased when TEOS addition was enhanced. TF-PET filter material possessed WCA of 163.2 ± 2.3°, while when TEOS: PFDTES mass ratio was 2.5:2, WSA was 6.2 ± 1.9° with filtration efficiency (0.3 μm) of 68.61%.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 53
·31092-31101
·
IF 3.049
Yu Wenlong,Chen Zhe,Yu Shitao,Ding Junwei,Shan Yuling,Liu Fusheng,Li Ming
Nanoporous carbon (NPC) derived from waste polyethyleneterephthalate (PET) bottles was prepared by a MgO-templated method and employed as a support for a highly dispersed platinum catalyst. The NPCs and Pt/NPCs catalysts were characterized by BET, SEM, TEM, XRD and ICP-OES. The catalytic performance of the NPC supported Pt catalysts for reductive alkylation of p-aminodiphenylamine (p-ADPA) with methyl isoamyl ketone (MIAK) was investigated. The textural properties of the NPC prepared could be tailored by changing the size of the MgO-template and the MgO/waste PET powder mass ratio. When the pore size was below 14 nm, the catalytic performance of the Pt/NPCs for the reductive alkylation could be improved with increasing the pore size of the NPCs. Profiting from the higher mechanical strength and the ideal pore structure, Pt/O@NPC50(1/1)–PTA had excellent reusability, which could maintain 98% conversion of p-ADPA after reused 10 times.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Chenxi Zhang,Chao Zhang,Jiewen Hu,Zhiming Jiang,Ping Zhu
To prepare flame-retardant anti-dripping of polyethylene terephthalate (PET) fabric, a hydroxyl-containing cyclic phosphoramide named as 2,2-dimethyl-1,3-propanediol-(2′-hydroxyethyl) phosphoramidate (DPHP) was synthesized and was coated on PET fabric by dip-coating technology. The flame retardancy, non-dripping performance and thermal stability of DPHP-coated PET fabrics were investigated by limiting oxygen index (LOI), vertical flammability, cone calorimetry tests and thermogravimetric analysis (TG). It was found that DPHP can enhance the char forming for PET, which endows the PET fabrics with excellent flame retardancy and non-dripping behavior. Although the LOI had a little increase with low content of DPHP (9.6 % weight gain), the non-dripping performance was observed. With the continuous increase of DPHP content, LOI was increased to 27.6 % and the damaged length was only 7.9 cm. After coating with DPHP, the char-forming ability of PET fabrics was improved and heat release was significantly reduced during the combustion. By analyzing the char residues by SEM-EDX, worm-like appearance and a large amount of phosphorus-based compounds were found in the char residue, indicating that DPHP owns efficient condensed-phase flame-retardant action for PET fabrics. This work suggests that hydroxyl-containing cyclic phosphoramide as a flame retardant is an effective way to develop flame-retardant and anti-dripping PET materials.
研究领域:
材料科学
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纺织工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Oncology
·
2023
·
IF 4.7
Liu Zhenfeng,Wen Guanghua,Huang Yuqiao,Dong Yanzhao,Wang Zewei,Alhaskawi Ahmad,Zhang Shuyi,Wang GuoLin,Ye Qianni,Zhou Haiying,Lu Hui,Dong Mengjie
Background: The cell adhesion molecule (CAM) N-cadherin has become an important target for tumor therapy. The N-cadherin antagonist, ADH-1, exerts significant antitumor activity against N-cadherin-expressing cancers.Methods: In this study, [18F]AlF-NOTA-ADH-1 was radiosynthesized. An in vitro cell binding test was performed, and the biodistribution and micro-PET imaging of the probe targeting N-cadherin were also studied in vivo.Results: Radiolabeling of ADH-1 with [18F]AlF achieved a yield of up to 30% (not decay-corrected) with a radiochemical purity of >97%. The cell uptake study showed that Cy3-ADH-1 binds to SW480 cells but weakly binds to BXPC3 cells in the same concentration range. The biodistribution results demonstrated that [18F]AlF-NOTA-ADH-1 had a good tumor/muscle ratio (8.70±2.68) in patient-derived xenograft (PDX) tumor xenografts but a lower tumor/muscle ratio (1.91±0.69) in SW480 tumor xenografts and lowest tumor/muscle ratio (0.96±0.32) in BXPC3 tumor xenografts at 1 h post-injection (p.i.) These findings were in accordance with the immunohistochemistry results. The micro PET imaging results revealed good [18F]AlF-NOTA-ADH-1 tumor uptake in pancreatic cancer PDX xenografts with strong positive N-calcium expression, while lower tumor uptake in SW480 xenografts with positive expression of N-cadherin, and significantly lower tumor uptake in BXPC3 xenografts with low expression of N-cadherin, which was consistent with the biodistribution and immunohistochemistry results. The N-cadherin-specific binding of [18F]AlF-NOTA-ADH-1 was further verified by a blocking experiment involving coinjection of a non radiolabeled ADH-1 peptide, resulting in a significant reduction in tumor uptake in PDX xenografts and SW480 tumor.Conclusion: [18F]AlF-NOTA-ADH-1 was successfully radiosynthesized, and Cy3-ADH-1 showed favorable N-cadherin-specific targeting ability by in vitro data. The biodistribution and microPET imaging of the probe further showed that [18F]AlF-NOTA-ADH-1 could discern different expressions of N-cadherin in tumors. Collectively, the findings demonstrated the potential of [18F]AlF-NOTA-ADH-1 as a PET imaging probe for non-invasive evaluation of the N-cadherin expression in tumors.
研究领域:
医学影像学
·
肿瘤学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Shichang Chen,Shixiang Fan,Gang Zhao,Xuhai Fu,Farao Zhang
A fluorescent functional PET fabric for effective aqueous copper detection was developed. Eu(TTA) 3 ·2H 2 O complex was prepared by the solvothermal method and subsequently PET fluorescent nonwoven fabrics were prepared by coordinating the complexes with PET nonwoven fabrics grafted with acrylic acid.The chemical structure and microscopic morphology of the fluorescent nonwovens were analyzed, and the effects of different experimental conditions (grafting rate, reaction time, and fluorescent complex concentration) on the fluorescence properties of the materials were investigated. Under optimal experimental conditions, the fluorescent nonwoven fabric exhibited a fluorescence intensity of 2.1 × 10 5 a.u. and a quantum yield of 6.35%. Additionally, the fluorescence intensity of the fluorescent nonwoven fabric decreased with the increase of aqueous copper concentration, and the quenching effect could be described by the Stern-Volmer equation. Furthermore, adjusting the pH of the aqueous copper at a fixed concentration revealed a linear relationship between the fluorescence intensity and pH. These observations demonstrate a dual response of the fluorescent nonwoven fabric to both aqueous copper and pH, enabling its potential application in the detection of both analytes.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Regenerative Biomaterials
·
2023
·
IF 6.7
Chen Qin,Fu Xiaomin,Cai Huawei,Fu Shengxiang,Cai Zhongyuan,Li Mufeng,Wu Xiaoai,Tian Rong,Ai Hua
Precise diagnosis of lymph node metastasis is important for therapeutic regimen planning, prognosis analysis and probably better outcomes for cancer patients. In this work, 68Ga-labeled amphiphilic alternating copolymers nanoparticles with different rigid ligands were synthesized as positron emission tomography (PET) probes for lymph node metastasis imaging. The labeling efficiency and stability of nanoparticles was improved with increased rigidity of coordination unit. PU(68Ga-L-MDI-PEG) nanoparticles (PU(68Ga-L-MDI-PEG) NPs) with the strongest rigidity of coordination unit exhibited the lowest critical micelle concentration, the best 68Ga labeling efficiency and stability. During in vivo lymph node metastasis imaging, PU(68Ga-L-MDI-PEG) NPs led to different accumulations in normal lymph nodes (N-LN) and tumor metastasized sentinel lymph nodes (T-SLN), which resulted in different PET signal presentation, making it feasible to differentiate N-LN from T-SLN. In comparison, small molecule probe 68GaL had poor lymph node accumulation, not only making it difficult to find lymph nodes on PET/computed tomography scan, but also tough to distinguish N-LN from metastatic ones. Overall, this work provides a reference for design of 68Ga labeled polymeric nanoparticles with high chelation efficiency and stability, as sensitive PET probes for lymph node imaging.
研究领域:
医学影像学
·
肿瘤学
·
核医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2024
·
IF 6.3
Kaixin Xu,Junli Xu,Panpan Hao,Ruiqi Zhang,Xiujie Cheng,Qing Zhou,Dongxia Yan,Yi Li,Jiayu Xin,Xingmei Lu
Recycling waste polyethylene terephthalate (PET) to prepare high-value chemicals can achieve resource recycling and reduce environmental pollution, which has important scientific significance. In this work, waterborne polyurethane (WPU) was prepared in one-pot method using non-metallic ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ( [Emim] [OAc]) as catalyst in the PET degradation. There is no need to separate the products and IL catalyst, avoiding product loss and metal residue. Meanwhile, the flame-retardant choline dihydrogen phosphate (N 1112OH DHP) was added, combining with the [Emim] [OAc], the WPU with good flame retardancy was obtained by using flame retardant with the phosphorus-nitrogen synergistic effect. The testing results indicated that the number average molecular weight (M n ) of WPU was as high as 23703 g/mol under the optimal conditions, the total heat release (THR) of WPU was reduced by 44.86%, the limiting oxygen index (LOI) was increased to 31.5%. Besides, the UL-94 testing of the WPU has reached V-0 level. In the end, the flame retardancy mechanism was studied through analyzing the perspectives of condensed phase and gas phase of of WPU. Thus, the WPU with good flame retardancy can be prepared in one-pot method by glycolysis of PET with ILs, which has certain guiding significance for the recycling and utilization of PET.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 152
·期 4
·1182-1193
·
IF 3.186
Shi Kaiyu,Guo Liying,Zheng Rongrong,Wang Haiyue,Chen Yanming
Five kinds of diacid comprising ionic liquid catalyst [HO 3 S–(CH 2 ) 4 -mim]Cl–MCl x ] were prepared, and their chemical structure, thermal stability and acidity were tested and analyzed. The performance evaluation of catalysts was carried out, and the process parameters were optimized. The cycling stability of the catalysts was investigated. Then, the catalytic degradation of polyethylene terephthalate (PET) was studied, and used mineral water bottles as an example. The chemical structure and molecular weight of the degradation product terephthalic acid bis(2-hydroxyethyl) ester (BHET) were analyzed. The results showed that among the catalysts synthesized, [HO 3 S–(CH 2 ) 4 -mim]Cl–FeCl 3 had the great catalytic performance and good thermal stability. According to the thermal gravimeter analysis, the decomposition temperature of the diacid ionic liquid catalyst ranges from 400 to 560 °C, while the degradation reaction temperatures in this paper are all below 250 °C, so that it has good thermal stability. At 190 °C, the PET alcoholysis rate reached 98.7% and the BHET yield reached 95.5% for 6 h, and the highest catalytic activity could still be maintained after 6 cycles, which indicate that the catalyst has excellent performance for degrading PET, and will have a great application prospect. Graphic Abstract
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）