查找使用阿拉丁产品的科研文献

Carbon aerogel micro-nanocontainers for high-performance anticorrosive and self-repairing coatings featuring high loading rate, low conductivity, and pH-related release

Shouren Li,Yuxuan Chen,Xiaolin Zhao,Jiakun Li,Zujun Huang,Jie Wang,Mu Yang,Yingdan He,Songmei Wu,Yu Yu,Kejian Ding

This work developed APTES-modified sodium alginate-based carbon aerogels (Si-SACA) as smart micro-nanocontainers to enhance epoxy coatings (EP) with superior corrosion resistance and autonomous self-healing functionality. The composite achieved a 29.02 % benzotriazole (BTA) loading via Multiple interactions and demonstrated pH-responsive release kinetics. Electrochemical testing revealed that 0.2 wt% BTA@Si-SACA/EP coatings maintained exceptional barrier properties (|Z| f =0.01Hz  > 10 10  Ω·cm 2 after 50-day immersion in 3.5 % NaCl), outperforming pure EP by two orders of magnitude. Meanwhile, the scratched 0.2 wt% BTA@Si-SACA/EP coating shows a certain self-repairing ability and corrosion resistance with the rise of the low-frequency modulus value to 5.25 × 10 4  Ω·cm 2 after 48 h of immersion. The self-healing ability comes from the release of BTA molecules and their chelation with the metal substrate to form an inert protective film.

Single silica-coated CsPbBr3 perovskite quantum dots with enhanced stability and excellent optical properties

Shuo Song,Wenzhi Wang,Bingqiang Cao

Halide perovskite quantum dots (PQDs) have been considered to be potential emitting materials for illumination and display applications. Unfortunately, the poor stability (air, water, and thermal) can greatly limit their practical applications. Herein, the mono-dispersed pure CsPbBr 3 PQDs with cubic morphologies are prepared by using a modified hot-injection method, as a control group. Based on this, a new surface activation strategy for preparing single CsPbBr 3 @SiO 2 core-shell PQDs with their initial cubic morphology and optical properties has been developed, using the CsPbBr 3 PQDs as a precursor and choosing the APTES as the surface ligand which can form a Si–O–Si covalent bond with the subsequently added silane to help complete single CsPbBr 3 @SiO 2 PQDs. The average thickness of the coated shell is about 2.3 nm and basically maintains the initial morphology and optical properties of PQDs. The PL intensity of CsPbBr 3 @SiO 2 PQDs dispersed in a mixed solution of toluene and water can retained 35% of the initial value even after 13 h, which are much higher than the pure CsPbBr 3 PQDs (9%). The photo-stability tests (air, water, and thermal stability) indicate that the CsPbBr 3 @SiO 2 PQDs is markedly more stable than that of the CsPbBr 3 PQDs owing to the complete encapsulation of the SiO 2 shell, indicating that the host packaging is an effective way to improve the stability. This work provides a simple and reliable synthesis way to synthesize the single core-shell particles, which can be suitable for other perovskite systems.

Synthesis, characterization, and adsorption properties of silica aerogels crosslinked with diisocyanate under ambient drying

Wang Qiang,Feng Jin,Ma Lirong,Wei Wei,Xie Jimin,Xia Changkun,Zhu Jianjun,Jiang Deli

Monolithic silica aerogels were prepared by sol–gel process via ambient drying process. TEOS and APTES were used as coprecursors and wet gels were crosslinked by three kinds of diisocyanate. The strengthened silica aerogels possess densities which range from 0.298 to 0.463 g/cm 3 , and the specific surface areas range from 81.17 to 135.48 m 2 /g. In this paper, silica aerogels crosslinked with different diisocyanate were used as adsorbents for the removal of heavy metals. At the same time, some factors such as the initial pH and concentration of heavy metals were investigated by a batch of experiments. The equilibrium sorption data have been fitted by different isotherm model, and the data fitting by Freundlich isotherm model indicates that the process of adsorption is favorable. Under the condition of the optimum adsorption pH, the maximum theoretical adsorption capacity computed from Langmuir model is 118.73 mg/g for Pb 2+ , 57.03 mg/g for Cr 3+ , and 60.86 mg/g for Cd 2+ , respectively with the silica aerogels crosslinked with 1,6-hexamethylene diisocyanate (HDI).

Synthesis of gold nanoparticles coated on flower-like MoS2 microsphere and their application for electrochemical nitrite sensing

Sai Zhang,Yuping Tang,Yanyan Chen,Jianbin Zheng

In this work, 3D flower-like MoS 2 microspheres with nanosheets were synthesized by a simple thiourea-assisted hydrothermal route and employed to support gold nanoparticles in order to fabricate a novel nitrite sensor. By this method, stable and well-distributed gold nanoparticles were formed due to the electrostatic attraction between APTES-functionalized MoS 2 and citric-stabilized gold nanoparticles. Electrochemical investigations indicated that Au NPs/MoS 2 nanocomposites exhibited an excellent performance towards nitrite oxidation . Under the optimal experimental condition (pH   6.0), the sensor displayed a wide linear range from 5.0   μM to 27.8   mM with a high sensitivity of 117.0   μAmM −1   cm −2 and a low detection limit of 1.67   μM. In a word, the present study demonstrates that the Au NPs/MoS 2 composites are promising electroactive materials for developing nitrite sensors with great potential.

Amine-bifunctionalized ZSM-5/SBA-16 composite for CO2 adsorption

Ge Lin,Wei Jianwen,Geng Linlin,Chen Siqi,Liao Lei

An amine-modified ZSM-5/SBA-16 (ZS) micro-/mesoporous composite was synthesized for CO 2 capture using nonionic tri-block copolymer pluronic (F127) as a template, tetraethyl orthosilicate (TEOS) as a silicon source and ZSM-5 zeolite as part of silicon aluminum source by embedding method. The amine-bifunctionalized samples were prepared by first grafting with aminepropyltriethoxysilane (APTES) and then impregnating with different concentrations of tetraethylenepentamine (TEPA). The amine efficiency, adsorption kinetics, thermal stability, regeneration performance and the effects of impregnated amine loadings (30–60%) and temperatures (30–90 °C) on the CO 2 adsorption performance were investigated using a thermal gravimetric analyzer (TGA) in the mixed gases (15 vol% CO 2 and the balance of N 2 ). The best adsorbent after modification of ZSM-5/SBA-16 composite material was screened to study CO 2 adsorption mechanism and adsorption kinetics. With the increase of the TEPA amount, the adsorption capacity of amine-bifunctionalized material first increased and then decreased. At 90 °C, the bifunctionalized ZSM-5/SBA-16 displayed the highest CO 2 adsorption performance of 1.630 mmol/g at the TEPA loading of 55%. The CO 2 adsorption mechanism of the bifunctionalized material was the synergistic effect of physical adsorption and chemical adsorption. After five adsorption/desorption cycle regenerations, the saturated adsorption capacity of the composite material was 1.496 mmol/g, which was only 8.2% lower than the original adsorption capacity. The composites exhibited good CO 2 adsorption performance, indicating the promising industrial applications for CO 2 capture form actual flue gas after desulfurization.

A Humidity-Insensitive Waterborne Polyurethane Pressure-Sensitive Adhesive Modified by Castor Oil and Siloxane

Jianrong Ren,Xiaobin Li,Ending Zhang,Jun Shi,Xiaoyan Xiong,Chenguang Kong,Cunzhi Li,Hangzhou Wang,Kun Wu

Graphical The long hydrophobic fatty acid chains of natural castor oil and low surface energy siloxane can form drainage structures that would displace water from the surface of the substrate to make PSA effectively contact with the substrate surface. Subsequently, some polar groups such as ester, urea, urethane and Si-OH will form hydrogen bonds with the active groups on the surface of the substrate to achieve effective bonding on the wet substrate. Although waterborne polyurethane pressure-sensitive (PSA) has achieved great progress, achieving robust effective adhesion on the wet substrate surface is still challenging. Herein, we developed a humidity-insensitive waterborne polyurethane pressure-sensitive adhesive through the modification of bio-based castor oil and 3-aminopropyl triethoxysilane (APTES) as the end-capper. Improved bonding property on wet substrate via drainage of hydrophobic groups led to better humidity-insensitive adhesiveness. The results exhibited exceptional bonding performance (∼3.3N/25 mm) on the moist surface of the steel in the environment with a humidity of 100 % RH (Relative Humidity). Especially, the 180° peel forces of siloxane-terminated castor oil-based waterborne polyurethane (SCWPU) respectively enhanced by 13.33 % and 73.68 % compared with the blank sample when the air humidity increased from 50 % RH to 100 % RH. Silicone had the advantages of low surface energy, good heat resistance and good oxidation resistance. The heat resistance could be improved by introducing silicone into waterborne polyurethane. Tested by the TGA, the SCWPU3 PSA demonstrated great thermal stability (T HRI =144.32 °C). Besides, the PSA also exhibited low water absorption (20.6 %), and eligible viscoelasticity properties. These findings provided an impetus for the development of humidity-insensitive PSA.

3D Biomimetic Hydrangea-Like BiOCl and PtNi Nanocube-Based Electrochemical Immunosensor for Quantitative Detection of CA19–9

Yarui An,Lin Song,Xiaoyan Chen,Chenming Ni,Kuanzheng Mao,Leijing Zhu,Yingying Gu,Yuqing Miao,Bin Song,Hongyun Ma

This work took advantage of 3D biomimetic hydrangea-like bismuth oxychloride (BiOCl) and PtNi nanocubes to fabricate a facile electrochemical immunosensor for the detection of CA19–9. Herein, APTES functionalized BiOCl (APTES-BiOCl) with large specific surface areas can provide eco-friendly microenvironment for biomolecules. The PtNi nanocubes prepared by the classic hydrothermal method have good conductivity, which can facilitate electron transfer highly efficient. Meanwhile, PtNi nanocubes can immobilize the anti-CA19–9 via covalent Pt-N bonds to anchor a great number of biomolecules more firmly. In addition, reduced graphene oxide (rGO) with excellent conductivity was implemented as a matrix, which greatly promoted electron transfer at the sensing interface. Under the optimal conditions, the proposed immunosensor can detect CA19–9 sensitively, from which a linear range of 0.01–150 U·ml–1 was derived accompanied with a low detection limit of 0.0034 U·ml–1. The results illustrated that the designed immunosensor exhibited excellent specificity, good reproducibility, and satisfactory stability. Moreover, it can be applied in the detection of real samples, which indicated that the immunosensor has great potential for early screening and diagnosis of diseases.

Rapid and selective extraction of norfloxacin from milk using magnetic molecular imprinting polymers nanoparticles

Yanan Cao,Zhao Huang,Lingli Luo,Jiayin Li,Pao Li,Xia Liu

The magnetic molecular imprinting polymers nanoparticles (MMIPs NPs) for the extraction of norfloxacin (NOR) were prepared by self-polymerization of dopamine onto the surface of (3-Aminopropyl)triethoxysilane (APTES)-modified Fe 3 O 4 NPs. The MMIPs NPs were characterized by FT-IR spectroscopy, XRD, VSM and TEM. The characterization results show that the MMIPs NPs possess superparamagnetic characteristic with the saturated magnetization value of 38.6 emu/g, and the average particle size of about 14.3 nm. Furthermore, the adsorption performance of the MMIPs NPs was evaluated by the static, dynamic, selective adsorption and reusability experiments. The adsorption capacity of MMINs NPs for NOR is 14.2 mg/g with an imprinted factor of 2.1. About 82.4–102.4% of the added NOR (20, 40, 60 μg/mL) were recovered from fortified milk samples with MMIPs NPs as sorbent. Moreover, the MMIPs NPs can be reused for at least six times.

Ag/APTES/CuxO (x = 1, 2)-MGS-Coated No-Core Fiber Surface Plasmon Resonance Gas Sensor and Its Application in Hydrogen Sulfide Detection

Cheng Li,Liu Xiao,Xiaozhan Yang,Wenlin Feng

Development of an advanced DNA biosensor for pathogenic Vibrio cholerae detection in real sample

M.R. Ali,M.S. Bacchu,M.A.A. Setu,S. Akter,M.N. Hasan,F.T. Chowdhury,M.M. Rahman,M.S. Ahommed,M.Z.H. Khan

Due to the epidemics of emerging microbial diseases worldwide, the accurate and rapid quantification of pathogenic bacteria is extremely critical. In this work, a highly sensitive DNA-based electrochemical biosensor has been developed to detect Vibrio cholerae using gold nanocube and 3-aminopropyltriethoxysilane (APTES) modified glassy carbon electrode (GCE) with DNA carrier matrix. Electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) experiments were performed to interrogate the proposed sensor at each stage of preparation. The biosensor has demonstrated high sensitivity with a wide linear response range to target DNA from 10 −8 to 10 −14 ( R 2 = 0.992 ) and 10 −14 to 10 −27  molL −1 ( R 2 = 0.993 ) with a limit of detection (LOD) value of 7.41 × 10 −30  molL −1 ( S/N = 5 ). The biosensor also exhibits a selective detection behavior in bacterial cultures that belong to the same and distant genera. Moreover, the proposed sensor can be used for six consecutive DNA assays with a repeatability relative standard deviations (RSD) value of 5% ( n  = 5). Besides, the DNA biosensor shows excellent recovery for detecting V. cholerae in poultry feces, indicating that the designed biosensor could become a powerful tool for pathogenic microorganisms screening in clinical diagnostics, food safety, and environmental monitoring.

Easily recyclable and highly active rice roll-like Au/SiO2 nanocatalysts from inverse miniemulsion

Zhihai Cao,Hangnan Chen,Yi Shang,Yushan Zhang,Dongming Qi,Ulrich Ziener

Rice roll-like (RR-like) Au/SiO 2 nanocatalysts (NCs) were synthesized through simultaneous sol–gel process of tetramethoxysilane and 3-aminopropyltriethoxysilane (APTES) and in situ reduction of gold salt in inverse miniemulsions. APTES played an important role in formation of RR-like SiO 2 nano-supports, reduction of gold salts to narrowly size-distributed sub–10   nm Au nanoparticles (NPs), and improved attachment of Au NPs to the SiO 2 nano-supports. The prepared RR-like Au/SiO 2 NCs displayed a pH-dependent, reversible colloidal stability in water, which facilitated to recycle them through tuning the pH value of the dispersion. Most importantly, the catalytic activity of the RR-like Au/SiO 2 NCs towards reduction of p -nitrophenol was about 7–9 times higher than that of the raspberry-like Au/SiO 2 NCs reported in our previous paper (Colloids Surf. A, 489, 2016, 223–233). The formation mechanism of the RR-like Au/SiO 2 NCs was also discussed.

A Small Highly Sensitive Glucose Sensor Based on a Glucose Oxidase-Modified U-Shaped Microfiber

Tingkuo Chen,Haiming Jiang,Kang Xie,Hongyan Xia

Diabetes patients need to monitor blood glucose all year round. In this article, a novel scheme is proposed for blood glucose detection. The proposed sensor is based on a U-shaped microfiber prepared using hydrogen-oxygen flame-heating technology, and then 3-aminopropyltriethoxysilane (APTES) and glucose oxidase (GOD) are successively coated on the surface of the U-shaped microfiber via a coating technique. The glucose reacts with the GOD of the sensor surface to produce gluconic acid, which changes the effective refractive index and then shifts the interference wavelength. The structure and morphology of the sensor were characterized via scanning electron microscope (SEM) and confocal laser microscopy (CLM). The experimental results show that the sensitivity of the sensor is as high as 5.73 nm/(mg/mL). Compared with the glucose sensor composed of the same material, the sensitivity of the sensor increased by 329%. The proposed sensor has a broad application prospect in blood glucose detection of diabetic patients due to the advantages of miniaturization, high sensitivity, and good stability.