ANALYST
·
2020
·Vol. 145
·期 13
·4664-4670
·
IF 3.978
Zhifang Wu,Hui Zhou,Qianjin Han,Xuelian Lin,Dongxue Han,Xun Li
The efficient detection of illicit drugs such as cocaine continues to be important for the fight against drug trafficking. Herein, we report a one-step method for rapid and specific cocaine detection. The method is based on our finding that small-molecule Thioflavin T (ThT) can act as a fluorescence indicator, which can be bonded with the anti-cocaine aptamer (MNS-4.1) to generate an enhanced fluorescence signal. More interestingly, upon cocaine binding, the intercalated ThT can be replaced, causing a drastic fluorescence reduction. We further optimized the sequence of MNS-4.1 and a new anti-cocaine aptamer (coc.ap2-GC) was obtained. This aptamer showed a higher affinity to both ligands, which increased the ThT binding fluorescence intensity and showed the highest quenching efficiency. Based on the fluorescence change induced by competitive binding, cocaine detection could be accomplished by a “mix-and-detect” strategy within seconds. Such a label-free method exhibits high sensitivity to cocaine with a low detection limit of 250 nM. Moreover, the practical sample analysis (2.5% human urine and saliva) also exhibits good precision and high sensitivity.
研究领域:
分析化学
·
毒品检测
·
生物传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Xiaobin Han,Zhilong Cao,Ruiyang Wang,Peng He,Yichi Zhang,Jianying Yu,Yangyang Ge
In order to evaluate the influence of silane coupling agent modified zeolite warm mix additives on the properties of asphalt, the physical and rheological properties as well as chemical structure of asphalt with zeolite, γ-ammoniapropyltriethoxysilane modified zeolite (KH550-zeolite) and γ-(2,3-epoxypropoxy)propytrimethoxysilane modified zeolite (KH560-zeolite) before and after thin film oven test (TFOT) aging were thoroughly investigated. The results showed that, compared with zeolite, KH550-zeolite and KH560-zeolite made the softening point of asphalt increase more, and whose penetration and ductility decrease less, which indicated that KH550-zeolite and KH560-zeolite (especially KH560-zeolite) could enhance the high-temperature properties and had less effect on the penetration and ductility of asphalt. The temperature susceptibility of asphalt was clearly reduced and the rutting factor (G*/sinδ) was enhanced after the introduction of silane coupling agent modified zeolites compared with zeolite. After the TFOT aging, the performance of asphalt with silane coupling agent modified zeolites (especially KH560-zeolite) had a little change. In a word, KH550-zeolite and KH560-zeolite as warm mix additives had a positive effect on the physical, rheological and anti-aging properties of asphalt.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Qun Lu,Aimin Sha,Wenxiu Jiao,Ke Shi,Ze Peng,Ruimeng Song
In response to the growing demand for energy-efficient and sustainable materials in road construction, this research presents a pioneering method to enhance the engineering application of bio-oil rejuvenated asphalt . Initially, aged asphalt was rejuvenated by blending with 6% castor oil . Subsequent modifications included introducing varying concentrations of polyphosphoric acid (PPA) (0%, 0.5%, 1.0%, 1.5%), combined with differing sulfur levels (15% and 30%). The rheological properties of the resulting asphalt binders were assessed using rotational viscometer (RV), asphalt binder crack device (ABCD), and dynamic shear rheometer (DSR) tests, while fourier transform infrared spectroscopy (FTIR) test was employed to reveal the interaction mechanism. The study’s key findings reveal that incorporating 15% sulfur significantly reduces asphalt viscosity , effectively lowering the mixing and compaction temperatures by approximately 17 °C and 15 °C, respectively. Besides, rutting factor ( G * / sin δ ) and fatigue life ( N f ) results unveil a positive connection between PPA content, high-temperature stability, and fatigue resistance. Furthermore, the grey relational analysis emphasizes a strong correlation between G * / sin δ and R 3.2 (grey relational degree of 0.986), indicating that the recovery rate partially reflects high-temperature performance. The FTIR analysis demonstrates that bio-oil primarily contributes through physical blending, whereas PPA undergoes chemical transformations, and the combination of sulfur with asphalt results in both physical and chemical reactions. In conclusion, this research emphasizes the synergistic potential of bio-oil, sulfur, and PPA in enhancing recycled asphalt performance. For optimal warm mix efficiency and road performance, incorporation of 15% sulfur and 1.0% PPA in bio-rejuvenated asphalt is recommended. These findings provide substantial advantages in reducing reliance on petroleum asphalt and mitigating carbon emissions , contributing to sustainable infrastructure development.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2019
·
IF 0
Rong Hua Zhuang,Jian Ying Yu,Heng Chang,Yan Zeng,Xue Yong Lan
The effects of modified natural zeolite warm mix agent (MNZWMA) and organic viscosity reducing warm mix agent (OVRWMA) on the physical properties, short term thermal oxidation aging, long term thermal oxidation aging and UV aging properties of the crumb rubber modified bitumen (CRMB) were investigated. The results showed that MNZWMA and OVRWMA could improve the high temperature stability and the low temperature crack resistance of CRMB, respectively. During the short term thermal oxidation aging, long term thermal oxidation aging and UV aging, OVRWMA increased softening point increment (SPI) and viscosity aging index (VAI) of CRMB, however, MNZWMA decreased its SPI and VAI. The analysis of FTIR spectra indicated that MNZWMA reduced the formation of carbonyl groups and sulfoxide groups, but OVRWMA accelerated the formation of carbonyl groups and sulfoxide groups to some extent during ultraviolet aging. Therefore, MNZWMA could improve the anti-aging properties, and OVRWMA was not conducive to the anti-aging properties of CRMB.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
CRYSTENGCOMM
·
2014
·Vol. 17
·期 5
·1086-1091
·
IF 3.858
Fanpeng Cai,Yubin Tang,Hao Shen,Chao Wang,Ao Ren,Lisong Xiao,Wei Gu,Weidong Shi
Novel mix-phase TiO2 nanosheets were successfully synthesized by a facile sol–gel method using graphene oxide (GO) as the sacrifice template for the first time. The SEM, TEM and AFM images revealed that the thickness of mix-phase TiO2 nanosheets was ca. 66 nm, and the TiO2 nanosheets were in a polycrystalline phase and made up of nanoparticles with the diameters of 15–25 nm. In addition, we observed that the proportion of rutile and anatase changed with the amount of tetrabutyltitanate (TBT). The results showed that the sample with 4 mL tetrabutyltitanate (TBT-4) exhibited the highest hydrogen production rate (339 μmol h−1) in all samples, which was 47% higher compared to the bulk sample. It was attributed mainly to the surface phase junction of anatase and rutile and the special morphology of the samples.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Shaochan Duan,Xiaonan Wu,Hongyu Wang,Jianying Hu,Yingcheng Luan,Tao Ma
To enhance the environmental sustainability and pavement performance of steel bridge deck paving, a novel semi self-compacting cold mix polyurethane mixture (CMPU-10) for steel bridge deck paving was specifically designed and evaluated. Herein, this study presents the first comprehensive documentation of the research process involved in the mix design of CMPU-10. Initially, based on the theory of maximum density curve, a gradation with a Talbot index ( n ) of 0.40 was identified as the preliminary gradation for designing CMPU-10 by void ratio, compressive strength and slump tests. Subsequently, the aggregate grade-by-grade filling test revealed the critical influence of sieve sizes (0.075 mm, 0.6 mm, and 2.36 mm) on the mixture dense degree. From these findings, an in-depth analysis of the effects of aggregate passage under the key sieve on the degree of mixture density, compressive strengths, and flow properties led to the determination of the gradation range of CMPU-10. The optimum binder-aggregate ratio for the median gradation was determined to be 9.2%. Finally, wheel tracking, semi-circular bending (SCB) and freeze-thaw splitting tests showed that the designed CMPU-10 exhibits superior high-temperature stability performance, low-temperature cracking resistance and moisture susceptibility compared to the TAF epoxy asphalt mixture (EA-10). This paper not only provides a new potential low-carbon material for steel bridge deck paving projects, but also establishes a theoretical foundation for the optimization design and promotion polyurethane mixture.
研究领域:
土木工程
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
DESALINATION
·
2023
·
IF 9.9
Qiu-Yu Zhu,Zi-Yun Xu,Jie-Han Fu,Jie Huang,Zhen-Liang Xu,Min Tong,En-Chao Li,Yong-Jian Tang
Currently, most nanofiltration membranes exhibit satisfactory separation performance on the anions or cations, and few membranes could concurrently separate anion and cation . Therefore, preparing nanofiltration membranes with excellent separation performance for both anionic and cationic ions remains a challenge. Herein, we have developed a series of nanofiltration membranes using conventional interfacial polymerization with different ratios of trimesoyl chloride (TMC) and piperazine (PIP) concentrations. In the interface polymerization process, the amine groups carried by PIP imparted a positive charge, while the hydrolysis of acyl chloride groups resulted in the generation of carboxylic acid groups that introduced a negative charge. The mix-charged nanofiltration membrane could be fabricated by varying PIP/TMC concentration ratios. The optimized membrane exhibited high rejection rates for bivalent ions (Na 2 SO 4 rejection of 96.6 %, MgCl 2 rejection of 93.0 %), and its selectivity for Mg 2+ /Li + mixed solution was improved significantly. This work provides a novel approach for the development of nanofiltration membranes capable of effectively separating mono-/divalent ions.
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
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Lu He,Qing-Qing Bi,Yue Ma,De-Yi Wang
The combination of flame retardant with warm mix asphalt (WMA) technology in asphalt pavements has become an important strategy for improving safety, conserving energy, and safeguarding the environment, especially in tunnel applications. This study explored the incorporation of flame-retardant nanocomposite and three distinct types of WMA additives into asphalt to investigate the mechanisms underlying the modification process and fire safety. Additionally, warm-mix asphalt samples without flame retardant were analyzed as control specimens for comparative analysis. The WMA additives notably enhanced the dispersion of flame-retardant nanocomposite and facilitated the conversion of medium and large molecules within the asphalt matrix. The combination of the organic WMA additive and flame-retardant nanocomposite provided superior flame retardancy and smoke suppression properties compared to asphalt that contained only flame retardant. The peak heat release rate and peak smoke production rate were significantly reduced by 45.5 % and 45.7 %, respectively. The detailed analysis indicated that the flame-retardant mechanism primarily resulted from the char layers reinforced by the continuous crystal grid structures in the asphalt, alongside the inert gases released by the flame-retardant nanocomposite. These results underscore the potential and significance of flame-retardant warm-mix asphalt for engineering applications.
研究领域:
土木工程
·
材料科学
·
消防安全
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2017
·Vol. 10
·期 4
·440
·
IF 2.654
Bing Yu,Tao Xu,Hailin Cong,Qiaohong Peng,Muhammad Usman
By using the two-step activated swelling method, monodisperse porous poly(styrene-divinylbenzene) (P(S-DVB)) microparticles were successfully synthesized. The influence of porogens, swelling temperatures and crosslinking agents on the porosity of porous microparticles was carefully investigated. Porous P(S-DVB) microparticles were used as a packing material for high performance liquid chromatography (HPLC). Several benzene analogues were effectively separated in a stainless-steel column as short as 75 mm due to the high specific surface area of the porous microparticles. Porous P(S-DVB) microparticles were further sulfonated and subsequently modified with diazoresin (DR) via electrostatic self-assembly and UV (ultraviolet) radiation. After treatment with UV light, the ionic bonding between sulfonated P(S-DVB) and DR was converted into covalent bonding through a unique photochemistry reaction of DR. Depending on the chemical structure of DR and mobile phase composition, the DR-modified P(S-DVB) stationary phase performed different separation mechanisms, including reversed phase (RP) and hydrophilic interactions. Therefore, baseline separations of benzene analogues and organic acids were achieved by using the DR-modified P(S-DVB) particles as packing materials in HPLC. According to the π–π interactional difference between carbon rings of fullerenes and benzene rings of DR, C60and C70were also well separated in the HPLC column packed with DR-modified P(S-DVB) particles.Keywords:polystyrene;seeded polymerization;macroporous structures;diazoresin;high performance liquid chromatography
研究领域:
化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
·
2022
·
IF 5.64
Yingliang Zhao,Jingping Qiu,Shiyu Zhang,Zhenbang Guo,Pinqi Wu,Xiaogang Sun,Xiaowei Gu
Arsenic-containing biohydrometallurgy waste (BW) is used to prepare a cementitious material , on the one hand, to solve the problem of lack of cheaper and greener binder for cemented paste backfill (CPB), on the other hand, to alleviate the arsenic pollution caused by BW. The binders were prepared by mixing blast furnace slag (BFS), BW, and ordinary Portland cement (OPC). The influence of mix proportions on the binder properties was investigated, including reaction kinetics, strength development, phase assembles of hydration products and arsenic (As) immobilization effects. Isothermal calorimeter analysis suggests that the binder reaction kinetics were highly determined by the mix proportions, and more BW addition decreased the reaction rate according to the Krstulovic-Dabic model. The optimal mix proportion of binder is 65–30-5, i.e., 65 wt% blast furnace slag, 30 wt% BW, and 5 wt% OPC. The compressive strength of this sample after curing for 3 days and 60 days is about 9.25 MPa and 40.88 MPa, respectively, and the hydration products mainly consist of ettringite and calcium silicate aluminate hydrate (C-(A)-S-H). Additionally, arsenic can be effectively immobilized in the binder, resulting from the denser structure (physical encapsulation) and ion exchange between arsenate and sulfate in ettringite.
✓ 已验证
产品关联
DOI
高影响因子
Energies
·
2024
·Vol. 17
·期 19
·4769
·
IF 3
Osama A. Marzouk
The aim of this study is to quantitatively describe the anticipated change in the energy mix of the Sultanate of Oman (Oman) as the country moves forward in its national plan for green hydrogen, in order to become a global producer and exporter. This aim is achieved by curating recent data about energy projects in Oman that are either operating or planned (in a construction or pre-construction stage). Then, these data are processed further to extract useful insights about how the energy mix would change if the planned projects are realized and added to the operating ones. This reveals the serious commitment of the country to accomplish its national plan for green hydrogen (GH), where the green hydrogen production ambition for 2030 is about 1.125 million tons per annum (Mtpa), using a renewable energy capacity of approximately 18 GW. This ambition increases to about 3.5 Mtpa with approximately 70 GW of renewables in 2040, and increases further to about 8 Mtpa with approximately 180 GW of renewables in 2050. As a portrait of Oman’s energy mix with the assumption of successfully completing all planned energy projects, we found that the country is expected to have a total capacity of 83.1271 GW, with the share of renewables (solar and wind) reaching 83.133% (as compared to 15.0711 GW with an 8.907% renewables share for operating projects). Nearly all (precisely 99.571%) of the 68.0560 GW planned national energy capacity additions are based on solar or wind energy, while the traditional oil–gas energy is gradually phased out. Green hydrogen production dominates this surge in renewables penetration within the Omani energy mix, with 84.659% of the planned 34.3140 GW solar capacity additions linked with green hydrogen production, for operating water electrolyzers. Similarly, 98.804% of the planned 33.4500 GW wind capacity additions are linked with green hydrogen production.
研究领域:
能源研究
·
环境科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Yuling Ren,Pengfei Qi,Yujie Han,Yinhua Wan,Jiuyang Lin,Ming Xie,Xiangrong Chen,Shichao Feng,Jianquan Luo
The efficient removal of organic contaminants from high-salinity wastewater is crucial for resource recovery and achieving zero discharge. Nanofiltration (NF) membranes are effective in separating organic compounds and monovalent salts, but they typically exhibit an excessive rejection of divalent salts. Modifying the charge characteristics of NF membranes can improve salt permeation; however, the role of charge spatial distribution in governing salt transport behavior is not fully understood. In this study, we developed a mix-charged NF membrane with a horizontal charge distribution by employing interfacial polymerization combined with a polyester template etching and solvent-induced polyamine intercalation strategy. The ratio of positive to negative charge domains in the membrane can be precisely controlled by adjusting the aqueous monomer ratio and polyamine modifier type. X-ray photoelectron spectroscopy (XPS) depth profiling and separation layer thickness analysis confirmed the complete penetration of polyamines into the separation layer, providing direct evidence of the formation of horizontally distributed charge domains. This unique charge distribution results in a high charge density and a near-electroneutral surface, which facilitates the permeation of the divalent salts. The size-dependent “plug-in” modification and covalent cross-linking further reduce pore size, enhancing rejection of small organic molecules. Additionally, the membrane demonstrated exceptional antifouling performance against both negatively and positively charged pollutants, attributed to its unique charge distribution and smooth surface. Molecular dynamics (MD) simulations further revealed that weak electrostatic interactions and a tightly bound hydration layer contribute to the membrane’s superior antifouling properties. This work provides valuable insights into the design of NF membranes with tailored microstructures and charge distributions for improved water treatment performance.
研究领域:
环境工程
·
水处理
·
膜技术
·
材料科学
✓ 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）