BIOCATALYSIS AND BIOTRANSFORMATION
·
2021
·
IF 2.181
Hongqian Dai,Yuan Lu,Hanbing Shi,Lan Tang,Xingyuan Sun,Zhimin Ou
Fe3O4 magnetic nanoparticles were prepared by chemical co-precipitation and modified with 3-aminopropyltriethoxysilane (APTES) and CS2 to form Fe3O4-APTES-CS2 magnetic carriers. Magnetically immobilized enzymes are attractive owing to their potential applications in many biological fields. When an alternating magnetic field is applied, the magnetic nanoparticles experience a force in the direction of the field, and the magnetic moments of the magnetic nanoparticles are apt to align in the direction of the field. Thus, magnetic nanoparticles behave like microscopic stirrers. The optimal reaction conditions of the acylation reaction using Fe3O4-APTES-CS2-lipase were 200 mmol/L 1-methyl-3-amphetamine, 100 mg immobilized lipase, 200 μL ethyl acetate, 12.6 × g rotating speed, 40 °C, and 5 days in the shaker. The conversion and enantiomeric excess of R-2a reached a maximum of 36.8% and 98.5%, respectively. 1-Methyl-3-phenylpropylamine was resolved using Fe3O4-APTES-CS2-lipase in an alternating magnetic field. The optimal magnetic field frequency and magnetic field intensity were determined to be 500 Hz and 12 Gs, respectively. The conversion and enantiomeric excess of R-2a reached a maximum of 40.3% and 98.5%, respectively. The results revealed that conversion under a magnetic field was significantly higher than that without a magnetic field. Highly optically active (R)-N-acetyl-1-methyl-3-amphetamine can be obtained via an efficient resolution of racemic 1-methyl-3-phenylpropylamine with immobilized lipase magnetic nanoparticles as a catalyst and ethyl acetate as an acyl donor in organic solvents in an alternating magnetic field.
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Hongri Wan,Teng Chen,Ya Lu,Xin Li,Fei Yu,Yunwei Ma,Zhaojian Gao
Porous materials with excellent mechanical stability and robust superhydrophobic performance exhibit promising prospect for practical applications in the field of oil−water separation. The construction of superhydrophobic surfaces typically involve two individual steps, including increase surface roughness and decrease surface energy. Unlike traditionally approach, the superhydrophobic performance of modified PU sponge can be accomplished by one−pot approach, which does not require complicated processing procedures or specific equipment. The present study successfully developed a superhydrophobic porous PU sponge using a facile and cost−effective one−pot approach by employing tannic acid (TA), 3–aminopropyltriethoxysilane (APTES), and octadecyltrimethoxysilane (ODTS) as superhydrophobic modifiers. The water contact angle of the modified PU sponge was determined approximately 152.3 °, suggesting its superhydrophobic characteristic. The modified PU sponge showed remarkable environmental tolerance when subjected to a wide pH range of acidic and alkaline solutions. The WCAs remained consistently above 150°, indicating its durability and stability against harsh circumstances. The superhydrophobic PU sponge also demonstrated remarkable of self−cleaning and antifouling capacities. The obtained sponge exhibited an impressive selective oil adsorption capacity from oil−water mixtures, ranging from 18.7 to 88.4 times of its initial mass, depending on the specific type of oil utilized in the test. The sponge still maintained its excellent adsorption capacity even after 20 cycles of adsorption–squeezing experiment. Immiscible oil−water mixtures with different densities could also be highly effectively separated by the superhydrophobic PU sponge in a continuous way. The separation efficiencies for diesel/water and chloroform/water were determined to be 98.5 % and 99.5 %, respectively, demonstrating outstanding levels of continuous separation effectiveness. With the readily available PU sponge as substrate material and the simple modification process, this work could provide a potential pathway for fabrication of cost−effective, long durable, and high efficient superhydrophobic materials in oil/water separation.
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
BIOSENSORS & BIOELECTRONICS
·
2015
·
IF 6.409
Yicheng Wei,Yan Li,Na Li,Yong Zhang,Tao Yan,Hongmin Ma,Qin Wei
In the present work, an ultrasensitive sandwich-type electrochemical immunosensor based on a novel signal amplification strategy was designed for quantitative detection of alpha fetoprotein (AFP). Au nanoparticles with biocompatibility were electrodeposited on the surface of glassy carbon electrode (GCE) which can effectively capture and immobilize primary anti-AFP (Ab 1 ) to significantly amplify the electrochemical signal. Graphene Oxide and CeO 2 mesoporous nanocomposite functionalized by the 3-aminopropyltriethoxysilane supported Pd octahedral nanoparticles (Pd/APTES-M-CeO 2 -GS) were utilized as labels of detection anti-AFP (Ab 2 ). Pd octahedral nanoparticles presented good catalytic activity towards the reduction of H 2 O 2 . Due to the large specific surface area and good adsorption properties of APTES-CeO 2 -GS nanocomposite, large amount of Pd octahedral nanoparticles could be immobilized, which could amplify the electrochemical signal and improve the sensitivity of the immunosensor. Under optimal conditions, the immunosensor exhibited wide linear range from 0.1 pg/mL to 50 ng/mL with a low detection limit of 0.033 pg/mL ( S / N =3) for AFP detection. In addition, high sensitivity, excellent selectivity, good reproducibility and stability were obtained for the immunosensor, which has a promising application for quantitative detection of other tumor markers in clinical diagnosis.
研究领域:
生物医学工程
·
肿瘤标志物检测
·
纳米技术应用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2024
·
IF 1.2
Yangyang Zhao,Longshan Cheng,Liwei Wu,Shuang Cheng,Zhixiong Huang,Yanbing Wang
In this work, a mesoporous silica (SBA-15) was synthesized using a hydrothermal method and the surface of the SBA-15 was further modified by utilizing the organosilane compound γ- aminopropyltriethoxysilane(APTES); FT-IR testing confirmed the successful grafting of these organic groups onto the surface of the SBA-15, the result being the AP-S. Composite films were subsequently prepared through a casting method, with SBA-15 and AP-S serving as the inorganic filler particles, and PVA acting as the matrix material. These films were characterized by tensile texts, dynamic mechanical analysis, scanning electron microscopy, and dielectric measurements. The results showed that the tensile modulus, loss modulus and dielectric properties of the modified AP-S/PVA composite films were improved compared with those of SBA-15/PVA, with the tensile strength being the largest at 145.25 MPa when the AP-S content was 2%. This result combined with the SEM analysis, shows that the incorporation of SBA-15 modified by APTES into PVA films can effectively improve the dispersion of SBA-15 in the PVA films, which can also explain the performance enhancement.
研究领域:
材料科学
·
高分子科学
·
纳米技术
·
化学工程
·
复合材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yuyang Zhou,Xiaochun Wu,Jin Zhang,Zhenxing Wang
Tannic acid (TA) − 3-aminopropyltriethoxysilane (APTES) coating (TA-APTES coating) composed of abundant nanospheres with secondary reaction sites has many distinct advantages for surface modification. Herein, an in-situ growth method is proposed to generate TA-APTES nanospheres on both the outer and inner surface of polypropylene (PP) membrane. Compared with previous reported TA-APTES nano spheres coating just on the outer surface of the membrane (named PP-Su-NPs), TA-APTES nano spheres on both outer and inner surfaces prepared with this method (named PP-En-NPs) exhibits much better functional performance after secondary reactions. As a proof of concept, the TA-APTES nanospheres is functionalized by tannic acid, polyethyleneimine (PEI) and Fe 3+ to carry positive charges for absorbing anionic dyes, and the dye adsorption performance of the PP-En-NPs after the secondary reactions is 7–8 times higher than that of PP-Su-NPs. Interestingly, the functionalized coating can not only absorb anionic dyes, but also cationic dyes, and selective desorption is also realized for this functionalized coating. The possible mechanism is revealed in this study. This study will accelerate the development of the TA-APTES coating, and make it become a powerful tool for membrane modification.
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
FOOD CHEMISTRY
·
2025
·
IF 9.8
Yingkun Shi,Fujia Dong,Argenis Rodas-Gonzalez,Guangxian Wang,Lingfan Yang,Sichun Chen,Hao-Bo Zheng,Songlei Wang
Heavy metal ions (HMIs) pollution has become a significant food safety concern owing to rapid urbanization and industrialization. In this study, a hypersensitive electrochemical sensor based on amino-functionalized MXene and bimetallic atom MOFs nanocomposites (MXene-NH 2 @CeFe-MOF-NH 2 ) was developed and applied for the detection of HMIs. MXene-NH 2 @CeFe-MOF-NH 2 nanocomposites were obtained by incubating MXene@CeFe-MOF prepared by hydrothermal and self-assembly methods in APTES to endow them with a large amount of surface amine functional groups. The introduction of -NH 2 could lead to a coordination effect between the nanocomposites and HMIs, promoting the enrichment efficiency of HMIs on the surface of the working electrode. The sensing platform demonstrated excellent detection performance, with limit of detection (LOD) values of 0.69 nM, 0.95 nM, and 0.33 nM for Cd 2+ , Pb 2+ and Hg 2+ , respectively, which were far below the maximum residue levels specified by the Chinese standards. Furthermore, the sensor was employed to analyze representative real samples (fish, whole milk, rice, and corn) to simulate an accurate analysis in complex scenarios and successfully detect the three HMIs simultaneously.
研究领域:
食品安全
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FirePhysChem
·
2026
·
IF 5.1
Wei Liu,Wenqi Yang,Zhenye Ma
The molecular bridge-mediated discontinuous loading strategy preserves active aluminum. • 5 wt% composite drops AP decomposition peak by 116.9°C and boosts heat release by 75.8%. • Cu 2+ /Cu + redox, ligand exotherm, and hierarchical loading synergize AP kinetics. • Interface engineering balances catalytic activity and reactivity. The dense native Al 2 O 3 layer on the surface of aluminum powder hinders interfacial contact with the decomposition products of ammonium perchlorate (AP), thereby restricting the energy release efficiency of Al/AP systems. To address the issue that conventional MOF coating strategies often achieve catalytic loading at the expense of active aluminum content, this work proposes an organosilane molecular-bridge-mediated surface-loading strategy: An amino-terminated self-assembled functional layer is fabricated on aluminum powder with 3-aminopropyltriethoxysilane (APTES). Aluminum particles are discretely anchored onto energetic MOF crystal surfaces through hydrogen bonding between amino groups and Cu-ATRZ ligands, as well as weak coordination with unsaturated Cu sites, yielding surface-loaded Cu-ATRZ@Al/APTES composite particles. This strategy avoids excessive shielding of active aluminum by a continuous coating layer, preserving an active aluminum content of 86.2% while achieving intimate particle-scale contact between catalytic sites and the fuel phase. Catalytic tests on AP thermal decomposition demonstrate that with only 5 wt.% addition of the composite particles, the peak temperature of AP high-temperature decomposition dropped significantly from 436.0°C to 319.1°C, a decrease of 116.9°C, whilst the exothermic heat of the system increased from 550.7 J∙g −1 to 968.2 J∙g −1 . Non-isothermal kinetic analysis reveals that the apparent activation energy of the composite system decreases from 196.7 kJ·mol −1 for pure AP to 156.5 kJ·mol −1 , and the catalytic effect is markedly superior to that of a physically mixed system. Mechanistic analysis indicates that the catalytic enhancement of this composite architecture stems from a triple synergistic effect: (i) electron transfer pathways enabled by the reversible Cu 2+ /Cu + valence interconversion, (ii) localized thermal feedback from the exothermic decomposition of the energetic ligand framework, and (iii) a shortened mass-transport distance for oxidizing species diffusing toward the fuel phase resulting from the surface-loaded structure. This work provides an interfacial engineering concept for energetic MOF/metal fuel composite systems that balances catalytic activity with fuel reactivity. Download: Download high-res image (191KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yuyang Zhou,Jin Zhang,Zhenxing Wang,Fang He,Shaoqin Peng,Yuexiang Li
Tannic acid (TA)-aminopropyltriethoxysilane (APTES) coating has excellent hydrophilicity, and can be applied to a variety of materials. But it has poor stability in the air. To improve its stability, we have developed TA-APTES-Fe(III) coating in our previous work, but there are still some problems remained such as tedious steps, and undesirable anti-crude oil-adhesion performance, etc. Besides, both TA-APTES and TA-APTES-Fe(III) coating cannot realize the hydrophilic modification of the inner surfaces of porous polypropylene (PP) membrane. To solve the above mentioned problems, we developed superhydrophilic and stable TA-APTES- tetraethylorthosilicate (TEOS) coating via one-step process in this study. The new coating can realize the superhydrophilic modification of the inner surfaces of porous PP membrane, and endows the PP membrane with good water permeability, which cannot be realized by our previously reported TA-APTES and TA-APTES-Fe(III) coating. Besides, the stability of the coating is greatly improved by introducing stable alcoholic hydroxyl groups derived from TEOS, and the resultant modified membrane can keep superhydrophilic (CA about 0°) and underwater superhydrophobic (underwater oil CA above 150°) even after being stored in air for more than 6 months, ultrasonic treatment for 10 min, or being rinsed by water for 24 h (3000r/min), exhibiting outstanding stability. More importantly, the crude oil adhesion force of the new coating is as low as 4 μN even under the preload force of 300 μN, showing excellent anti-crude oil-adhesion property. The PP membrane modified by the new coating possesses ultrahigh water flux (10384 L m -2 h -1 bar -1 ) and can realize highly efficient separation of oil-in-water emulsion (above 99%). This work is expected to accelerate the practical application of TA-APTES coating.
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
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2018
·
IF 3.468
Yun Liu,Quan-Quan Wang,Zhi-Ming Jiang,Chuan-Jie Zhang,Zhong-Fang Li,Hua-Qi Chen,Ping Zhu
Chitosan was added to cotton fabrics coated with sodium phytate and 3-Aminopropyl triethoxysilane (APTES) to further enhance the fire retardant property by the layer-by-layer (LBL) assembly. The surface morphologies before and after flaming and structure of coated cotton fabrics were evaluated by scanning electron microscopy and Fourier transform infrared analysis. The thermal degradation properties, fire retardancy, and combustion properties of this system were investigated by Fourier transform infrared analysis, thermogravimetric analysis coupled with Fourier transform infrared analysis (TG-FTIR) in the N 2 atmosphere, the thermogravimetric analysis in air atmosphere, limiting oxygen index test (LOI), vertical burning test and cone calorimeter test, respectively. Sodium phytate, chitosan and hydrolyzed APTES were successfully deposited and well distributed on the surface of cotton fibers. The LOI value of the coated cotton fabric with 15BL was 29.0%, and it extinguished at once in the vertical burning test, while the coated cotton fabrics with 5BL and 10BL were burned out. The deposition of sodium phytate, chitosan and hydrolyzed APTES led to the decrease of heat release rate, total heat release, total smoke release and smoke production rate. The promoted fire retardancy was assigned to thermally stable residuals formed on the surface of cotton fibers, which prohibited heat/mass transfer from combustion zone to polymer degradation zone. TG-FTIR results indicated that flame retardant cotton fabrics produced more nonflammable gases (CO 2 and H 2 O) and less combustible gases than them of the control sample did, increasing flame retardant properties of flame retardant cotton fabrics.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 23
·10600-10607
·
IF 7.79
Bing Tang,Xuan Zhao,Lin Ji Ruan,Changyun Qin,Ang Shu,Ying Ma
CsPbX3 (X = Cl, Br, I) nanocrystals (NCs) have shown great potential in various optoelectronic devices due to their excellent photophysical properties. However, the poor stability has severely impeded their practical applications. Much effort has been devoted to the preparation of monodisperse core–shell NCs to improve the stability of CsPbX3 NCs. However, it is still challenging to develop a general method to coat CsPbX3 NCs with oxides at the single-particle level. In this work, we report a simple way to prepare monodisperse CsPbX3@SiO2/Ta2O5/ZrO2 core–shell structure NCs using 3-aminopropyl triethoxysilane (APTES) as a bridging ligand. It has been found that careful control of the hydrolysis and condensation process of oxide precursors is critical for the successful preparation of CsPbX3@oxide core–shell NCs. The stability of CsPbI3 NCs upon attack of water, UV-light irradiation, and heating before and after the oxide shell growth has been investigated, demonstrating the efficient protective effect of oxide shells. This work not only provides a novel and universal approach for coating the individual CsPbX3 nanocrystal with various oxide shells but also paves the way for potential practical applications of CsPbX3 NCs because of the enhanced stability.
研究领域:
材料科学
·
纳米技术
·
光电
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Yi Shang,Zhihai Cao,Hangnan Chen,Yangyi Sun,Jia Yao,Lin Yang,Dongming Qi,Ulrich Ziener
In our previous paper, we reported the synthesis of easily recyclable and highly active rice roll-like (RR-like) Au/SiO 2 nanocatalysts (NCs) in inverse miniemulsions [Colloids Surf. A 517, 2017, 52–62]. In the present contribution, the influences of three key synthesis parameters, including the 3-aminopropyltriethoxysilane (APTES) content, reaction temperature, and urea amount, on the particle properties of the Au/SiO 2 NCs were systematically investigated. The role of these synthesis parameters in the formation of SiO 2 nanosupports and Au nanoparticles (NPs) was discovered. The RR-like SiO 2 nanosupports could only be formed in the systems within the range of 20–80 mol% of APTES content, at reaction temperatures above 60 °C, and with more than 0.72 mg of urea. The AuCl 4 − ions could be immobilized onto the aminopropyl-functionalized SiO 2 nanosupports through a coordination interaction. The immobilized ions were reduced by the aminopropyl groups at elevated temperatures. The APTES content and reaction temperature play an important role in controlling the particle size and its distribution of Au NPs. The catalytic activity of Au/SiO 2 NCs depends significantly on the APTES content. The RR-like Au/SiO 2 NCs with smaller immobilized Au NPs and higher specific surface area display higher catalytic activity towards hydrogenation of p -nitrophenol.
研究领域:
纳米技术
·
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Abdul Majid,Yanbo Tian,Huiru Li,Liju Tan,Rizwan Haider,JiangTao Wang
Metronidazole (MTZ) as a widely used antibiotic of the nitro-imidazole class to treat infections in both humans and animals, is found to be toxic, mutagenic, carcinogenic and poses a risk to aquatic life and human health via the food chain. An eco-green sustainable and novel APTES-CQDs@MIPs fluorescent sensor was developed with a cost-effective hydrothermal method from APTES and waste orange peels, coupled with molecular imprinting using reverse micro-emulsion for rapid and accurate detection of MTZ in water samples. APTES-CQDs achieved simultaneous carbonization, nitrogen doping, and silica-based passivation, eliminated toxic chemicals, and demonstrated zero waste. The sensor response time was 1 min upon rebinding with MTZ and the fluorescence quenching mechanism was proposed to be charge transfer and static quenching. The APTES-CQDs@MIPs sensor had exceptional reproducibility (RSD 3.45 %) and showed excellent sensitivity and selectivity towards MTZ with a linear concentration range of 0.17–40.00 μM (R 2 = 0.997), and the detection limit of 0.05 μM. The imprinting factor (IF) reached 4.67 and recycle efficiency achieved over 88 % up to five cycles. The constructed fluorescent probe demonstrated comparable results to other reported methods, with recoveries of 95.1–108.2 %. The sensor has the advantages of simplicity, excellent selectivity, superior sensitivity, good reproducibility, stability, and recyclability.
研究领域:
分析化学
·
环境科学
·
生物医学
✓ 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）