FIRE AND MATERIALS
·
2022
·Vol. 47
·期 3
·341-351
·
IF 1.979
Tingxiang He,Junhong Guo,Chengxia Qi,Rui Feng,Baoping Yang,Yingping Zhou,Li Tian,Jinfeng Cui
Boron-containing Schiff base flame retardant ((E)-2-([2,4-dihydroxybenzylidene]amino)ethyl dihydrogen borate (B-HIBD) was prepared easily and successfully. Thermogravimetric analysis (TGA) showed that when the additive amount was only 3 wt%, the introduction of B-HIBD significantly improved the thermal stability of epoxy resin (EP) composites. The cone calorimeter test showed that compared with pure EP, the peak of heat release rate (PHRR), total heat release (THR), smoke production rate (SPR)，total smoke production (TSP) ，and the releasing of CO for 3 wt% B-HIBD/EP reduced by 58.2, 18.3, 65.9, 51.2, and 28.4%, respectively, showing that B-HIBD could significantly enhance the fire safety of EP composites. This promotion has been embodied not only in the catalysis function of the Schiff base group containing benzene ring but also in borate participating in the carbon-forming process, promoting the dehydration and carbonization of the EP surface and delaying the transfer of mass and heat in the combustion process, which enhance performance for flame retardant. So it is an efficient strategy to develop a novel type of high-efficiency boron-containing Schiff base flame retardant to improve the fire safety for EP.
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
FIRE AND MATERIALS
·
2017
·Vol. 42
·期 1
·99-108
·
IF 1.352
Xiaomeng Wang,Xueqing Liu,Sha Peng,Panrui Peng,Liyong Zou,Jia Chen,Jiyan Liu
Summary A novel phosphorus-containing acrylate monomer (AOPA) was synthesized starting from 2-methy-2,5-dioxo-1,2-oxaphospholane and hydroxyethyl acrylate. The structure of AOPA was characterized with FTIR and 1 H NMR. AOPA shows good compatibility with polyethylene glycol diacrylate (PEGDA) and can polymerize with PEGDA under UV light irradiation at different mass ratios to form membranes with high transparency (above 88.9% of light transmittance in the range of 400-800 nm) and flexibility. Incorporating 20 wt% of AOPA in PEGDA reduced the total heat release and peak rate by 50.3% and 38.4%, respectively, as measured by micro combustion calorimeter. The membrane containing 40 wt% of AOPA with 0.4 mm thickness can pass the UL94 V0 rating, and limiting oxygen index reaches 33.4%. TG-FTIR and SEM-EDX analysis show that the presence of AOPA depresses the thermal degradation and promotes the char formation.
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
FIRE AND MATERIALS
·
2017
·Vol. 42
·期 1
·109-118
·
IF 1.352
Bin Zhang,Jian Han
Summary The novel core-shell magnesium dihydroxide (MDH)/zinc stannate (ZS) and melamine-formaldehyde (MF) resin/MDH/ZS microcapsules were prepared. Their structures were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, transmission electron microscopy, and X-ray photoelectron spectroscopy analysis techniques, then its flame-retardant application in poly(vinyl chloride) (PVC) composites. The PVC composites were investigated by the limited oxygen index, smoke density, vertical burning test (UL-94), cone calorimeter test, scanning electron microscopy, and thermogravimetric analysis. When directly exposed to flame, PVC generated a high-density char layer, giving PVC a self-extinguishing property. Furthermore, when the mass ratio of MDH/ZS and MF/MDH/ZS microcapsules were 2/8 and 10/2/8 with 16 wt% loading, the results showed that the limited oxygen index value reached 29% and 33%, and the smoke density value reached 51% and 41%. Thus, the microencapsulated ZS could greatly suppress the generation of the flame and smoke during combustion, showing potential applications as multifunctional advanced composites. Two aspects of this manuscript will make it interesting to general readers of Fire and Materials. The magnesium dihydroxide (MDH)/zinc stannate (ZS) microcapsule was firstly prepared via chemical deposition method, and then melamine-formaldehyde (MF) resin/MDH/ZS microcapsule was secondly prepared. The smoke density of poly(vinyl chloride) (PVC)/MDH/ZS microcapsule and PVC/MF/MDH/ZS microcapsule composites were less than half of the neat PVC. With the addition of the 16 wt% of MDH/ZS or MF/MDH/ZS microcapsules into PVC, the limited oxygen index value of PVC composites achieved a significantly high limited oxygen index value at 29%, 33%, and the smoke density value of PVC reached 51%, 41%, respectively. They are V-0 rating in UL-94 test. The results indicated that MDH/ZS and MF/MDH/ZS microcapsules behaved as an environmental friendly flame retardant and smoke suppressant. Thus, this study demonstrated the great potentials of the intrinsically flame-retardant MDH/ZS and MF/MDH/ZS microcapsules in the application of high performance matrix resin and composite material.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
FIRE AND MATERIALS
·
2022
·Vol. 47
·期 6
·784-793
·
IF 1.979
Li Li,Hui Xi,Jing Yang,Ting Xiao,Rui Zuo,Xueqing Xu,Yaoxia Yang,Zhiwang Yang,Ziqiang Lei
Soaring development in widely applicable materials raises an urgent demand to develop high-performance epoxy resin (EP) materials combining superior flame retardancy, smoke suppression and mechanical properties. Phosphorus, boron and nitrogen-containing flame retardants are high potential environmental-friendly flame-retardant additives in polymer manufacturing owing to their low toxicity, molecular diversity, and efficient flame resistance. In this paper, a novel additive flame retardant of RGO-HCCP@MPB compound was fabricated which involved the functionalization of reduced graphene oxide (RGO) with hexachlorocyclotriphosphazene (HCCP), and the simple complexing RGO-HCCP with melamine phosphate borate (MPB). The prepared RGO-HCCP@MPB was then directly mixed with EP matrix to evaluate its flame resistance. It found that the addition of RGO-HCCP@MPB obviously inhibited the heat release and smoke emission behaviors of EP matrix during combustion. With 5 wt% addition of RGO-HCCP@MPB in EP, the LOI value of EP/RGO-HCCP@MPB reached up to 28.4%, the peak heat release rate (PHRR) and the total heat release (THR) decreased by 61.1% and 30.5% compared to neat EP, respectively. Furthermore, the flexural strength and flexural modulus of the EP/RGO-HCCP@MPB were also promoted compared with that of the pure EP. The flame-retardant mechanism shows that elements of boron (B), nitrogen (N) and phosphorus (P) in RGO-HCCP@MPB compound play a synergistic role in the enhancement of the flame retardancy of EP in a combustion.
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
FIRE AND MATERIALS
·
2022
·Vol. 47
·期 3
·400-410
·
IF 1.979
Chenyu Wang,Hu Shi,Xin Wang,Lei Song,Yuan Hu
An eco-friendly and bio-based ternary hybrid hydrogel consisting of carrageenan, vermiculite, and dimethyl methyl phosphate (DMMP) was prepared through a facile one-pot method. Rheological tests showed that this ternary hybrid hydrogel was a power-law fluid. The formulation of the ternary hybrid hydrogel was also screened, and the optimal formulation was found to be the ternary hybrid hydrogel containing 1 wt% carrageenan, 2 wt% DMMP, and 4 wt% vermiculite. Firefighting experiments showed that the ternary hybrid hydrogel could stop the chain reaction and rapidly reduce the temperature of combustion. Compared to water, the extinguishing time of the ternary hybrid hydrogel was shortened by 46.6%, and the volume consumed was reduced by 43.3%. The superior fire extinguishing efficiency of the ternary hybrid hydrogel could be attributed to the combined effect of each component: carrageenan provides viscosity, making the hydrogel firmly cover the burning surface; DMMP works as a free radical scavenger that can stop chain reactions; and vermiculite acts as a barrier layer, which helps to insulate air and heat and prevent resurgence. This work provides an environmentally-friendly, cost-effective, and bio-based hybrid hydrogel for firefighting.
研究领域:
材料科学
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消防工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FIRE AND MATERIALS
·
2023
·Vol. 47
·期 8
·1082-1091
·
IF 1.9
Ke Shang,Gui-De Lin,Hui-Jing Jiang,Xing Jin,Jing Zhao,Dan Liu,Bi Zhao,Jin-Jun Yang,Teng Fu,Jun-Sheng Wang
Two types of ceramifiable flame-retardant room temperature vulcanized (RTV) silicone rubber foam containing mica power (MP) were prepared by using glass powder (GP) as fluxing agents and aluminum hydroxide (ATH) as flame-retardant agent, respectively. The flame retardant, combustion behavior, and thermal stability of ceramifiable flame-retardant RTV silicone rubber foams were investigated. The results show that GP is not conducive to the flame retardancy and thermal stability improvement of the foams. On the contrary, MP and ATH can significantly improve the flame retardancy and thermal stability at high temperatures of the foams. The foams with addition of MP and ATH can reach to a high limiting oxygen index value of 35.8 with V-0 rating in the vertical combustion test, and the total heat release and total smoke production of the foams are 21.0% and 61.7% lower than of the pure RTV silicone rubber foam, respectively. Furthermore, the structural and morphological changes of the foams under different pyrolysis conditions were studied, so as to reveal its ceramifiable mechanism under different fire scenarios. The results show that GP does not promote the formation of more char residue during pyrolysis, but it can greatly lower the ceramifiable temperature, resulting in a superior ceramic phase char residue. The foams including MP and ATH have a high char residue content; nevertheless, a comparatively higher temperature is necessary to create ceramic phase char residue.
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
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 5
·1-10
·
IF 6.408
Wei Jinxiu,Zhu Kai,Chen Zengwei,Yang Zhaoyan,Yang Kuo,Wang Zhuyuan,Zong Shenfei,Cui Yiping
Programed cell death ligand 1 (PD-L1) is a protein biomarker overexpressed on exosomes derived from tumor cells. It plays an important role in tumor diagnosis, screening, evaluation of therapeutic efficacy, and prognosis. In this study, a facile method is presented to detect PD-L1-overexpressing cancer exosomes with high specificity and sensitivity. First, gold nanospheres (GNSs) were attached to the bottom of an eight-well chambered slide by electrostatic adsorption, forming the detection substrate. Then, Cy5-labeled CD63 aptamers (i.e., the capture probes) were modified on the GNSs by Au–S bond. After adding samples containing target exosomes which were stained by membrane dyes DiI in advance, FAM-labeled PD-L1 aptamers (i.e., the immunoprobes) were added to recognize PD-L1 on the target exosomes. By triple-color fluorescence co-localization (TFC) of the Cy5, DiI, and FAM channels, highly sensitive and reliable detection of the PD-L1-overexpressing exosomes was achieved in the concentration range 7.78 × 10 1 to 7.78 × 10 4 particles/mL with a detection limit down to 6 particles/mL. The advantages of the proposed detection method include the following; first, the detection substrate is easy to prepare and convenient to clean. Second, the TFC strategy can completely exclude nonspecific reaction sites and thus significantly improves the accuracy. Such a facile and reliable detection method holds a great potential in exosome-based cancer theranostics. Graphical abstract In this paper, we proposed a triple-color fluorescence co-localization (TFC) strategy to significantly improve the reliability of exosome detection and the detection substrate is easy to prepare and convenient to clean. In addition, the LOD is down to 6 particles/mL, which is quite low compared with other detection methods
研究领域:
癌症生物学
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纳米技术
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分子生物学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED OPTICS
·
2023
·Vol. 62
·期 31
·8272-8278
·
IF 1.9
Zhenglan Bian,Caihong Dai,Fenghong Chu,Anduo Hu,Liang Xue,Qing Xu,Yuan Feng,Bin Zhou
This paper presents a hydrogel optical fiber fluorescence pH sensor doped with 5(6)-carboxyfluorescein (5(6)-FAM). The hydrogel optical fiber was fabricated with 2-hydroxy-2-methylpropiophenone as a photoinitiator, with different concentrations of polyethylene glycol diacrylate (PEGDA) for the core and cladding. A pH-sensitive fluorescence indicator 5(6)-FAM was doped into the core of the fiber. The prepared hydrogel optical fiber pH sensor showed good response within the pH range of 5.0–9.0. The linear range of the pH sensor is 6.0 to 8.0, with ${{R}^2} = {0.9904}$; within this range, the sensor shows good repeatability and reversibility, and the resolution is 0.07 pH units. The pHs of pork tissues soaked in different pH buffers were detected by the hydrogel optical fiber pH sensor; the linearity is 0.9828 when the pork tissue pH is in the range of 6.0–7.5. Due to the good ion permeability and biocompatibility of the hydrogel, this hydrogel optical fiber pH sensor is expected to be used in biomedical applications.
研究领域:
生物医学工程
·
传感技术
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 5
·1-9
·
IF 5.705
Huang Jianyong,Li Fenglan,Guo Rubin,Chen Yuyuan,Wang Zhenzhen,Zhao Chengfei,Zheng Yanjie,Weng Shaohuang,Lin Xinhua
Amino-modified carbon dots (C-dots) with positively charged surface were prepared. They display strong blue fluorescence and are shown to act as quenchers of the green fluorescence of FAM-labeled ssDNA such as the F-probe used in this work that was immobilized on the C-dots. On the addition of highly negatively charged heparin (Hep), it will interact with the C-dots and displace the F-probe from C-dots. Once the F-probe is displaced by Hep, its green fluorescence is restored. The intrinsic blue fluorescence of the C-dots remains stable after addition of Hep. Thus, a signal-on ratiometric fluorometric assay was developed for the ultra-sensitive detection of Hep. The underlying mechanisms of quenching and recovery are discussed. Under optimized conditions, the recovery of the ratiometric fluorescence of the system composed of C-dots and quenched F-probe is proportional to the Hep concentration in the range of 0.01–2.0 μg·mL −1 (= 0.00125–0.25 U·mL −1 ). The method was successfully applied to the determination of Hep in spiked serum samples.
Schematic of a signal-on ratiometric fluorometric method for the ultra-sensitive detection of heparin on the basis of the displacement and fluorescence enhancement of adsorbed FAM-labeled ssDNA from amino-modified carbon dots (C-dots) by heparin.
研究领域:
生物化学
·
分析化学
·
医学检验
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 3
·1-7
·
IF 5.7
Li Xiang-Ling,Jiang Han,Zhao Lei,Song Tian shun,Xie Jing jing
A versatile DNA nanomachine detection system has been developed via the combination of DNAzyme with catalytic hairpin assembly (CHA) technology for achieving accurate and sensitive detection of lead ions (Pb 2+ ). In the presence of target Pb 2+ , capture DNA nanomachine formed by AuNP and DNAzyme recognized and reacted with Pb 2+ , which yielded an “active” DNAzyme, that induced the cleavage of substrate strand, and then released the initiator DNA (TT) for CHA. With the help of the initiator DNA TT, self-powered CHA was activated to achieve the signal amplification reaction in the detection of DNA nanomachine. Meanwhile, the initiator DNA TT was released and hybridized with the other H1 strand to initiate another CHA, replacement, and turnovers, producing enhanced fluorescence signal of fluorophore FAM (excitation 490 nm/emission 520 nm) for sensitive determination of Pb 2+ . Under the optimized conditions, the DNA nanomachine detection system revealed high selectivity toward Pb 2+ in the concentration range 50–600 pM, with the limit of detection (LOD) of 31 pM. Recovery tests demonstrated that the DNA nanomachine detection system has excellent detection capability in real samples. Therefore, the proposed strategy can be extended and act as a basic platform for highly accurate and sensitive detection of various heavy metal ions. Graphical Abstract
研究领域:
纳米技术
·
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 39
·期 3
·1892-1898
·
IF 3.159
Xuehua Yin,Jin Cai,Hongyan Feng,Zeming Wu,Jianmei Zou,Qingyun Cai
A novel ultrasensitive sensing system for rapid fluorescence detection of cytochrome c (cyt c) was proposed by combining aptamer-based bioassay with VS2 nanosheets. VS2 nanosheets with high fluorescence quenching ability were synthesized by the solution route. A cyt c-binding aptamer was tagged with the fluorescent dye carboxy fluorescein (FAM), acting as the probe. VS2 nanosheets can adsorb the probe and quench its fluorescence efficiently. However, the fluorescence of the probe was retained when it was incubated with cyt c and then mixed with VS2 nanosheet solution. The proposed sensing system shows high selectivity and sensitivity, giving a linear range of 0.75 nM to 50 μM, and a limit of detection of 0.50 nM.
研究领域:
纳米技术
·
生物传感器
·
分析化学
·
生物分析化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2021
·Vol. 13
·期 29
·3282-3291
·
IF 2.896
Jiaxin Zhang,Tingting Feng,Jiayu Zhang,Ning Liang,Longshan Zhao
A simple, quick, effective turn-on fluorescence assay for the determination of fipronil (FIP) was built based on the yellow fluorescence of FAM-aptamer and excellent quenching capability of the oxidized single-walled carbon nanohorns (The oxidized SWCNHs). Oxidized SWCNHs with the great advantage of good dispersibility in solution were generated by link to carboxyl group and were added to a specific FAM-aptamer at an optimal concentration to form an “on–off” oxidized SWCNH/FAM-aptamer fluorescent sensor. The structures of the oxidized SWCNHs were verified, and the comprehensive properties were evaluated by characterization techniques. This paper has exploited oxidized SWCNHs as a quenching agent to detect fipronil for the first time. Under the optimized conditions, the limit of detection (LOD) for fipronil was 3 nM, and the recovery of fipronil varied from 88.6% to 112.7% in different real samples with relative standard deviations (RSDs) not more than 5%. The developed method could be successfully applied for the determination of fipronil in tap water, honey and corn samples.
研究领域:
分析化学
·
环境科学
·
食品安全
·
纳米技术
✓ 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）