查找使用阿拉丁产品的科研文献

Polyaniline/CeO2 nanocomposites as corrosion inhibitors for improving the corrosive performance of epoxy coating on carbon steel in 3.5% NaCl solution

Yanhua Lei,Zhichao Qiu,Ning Tan,Hailiang Du,Dongdong Li,Jingrong Liu,Tao Liu,Weiguo Zhang,Xueting Chang

Polyaniline/cerium dioxide (PANI/CeO 2 ) nanocomposite (NPs) was synthesized by in situ polymerization of aniline in the presence of CeO 2 NPs. Various analytical facilities, i.e., powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM), were utilized to characterize the synthesized CeO 2 and PANI/CeO 2 NPs. The coatings prepared from the synthesized PANI/CeO 2 NPs exhibited excellent corrosion resistance that was superior to epoxy coatings added with PANI in NaCl solution. The exceptional improvement of corrosion protection performance of the PANI/CeO 2 /epoxy coatings is associated with the synergetic protection of the enhancement of the protective barrier due to the role of CeO 2 NPs and PANI against the diffusion of aggressive ions (e.g., Cl − ) and the improvement of self-healing protection attributed to the redox behavior of PANI. Thus, the hybrid PANI/CeO 2 NPs are considered as the best route to enhance the protection performance of the epoxy coatings on carbon steel.

Controlled Delivery of 2-Mercapto 1-Methyl Imidazole by Metal–Organic Framework for Efficient Inhibition of Copper Corrosion in NaCl Solution

Zhishun Zhu,Xiulan Zhang

In this paper, zeolitic imidazolate framework-8 was modified by N-(3-aminopropyl)-imidazole to obtain a novel MOF called AMOF. Subsequently, AMOF served as a carrier for the delivery of 2-mercapto-1-methyl imidazole (MMI) to inhibit the corrosion of Cu. Scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction were applied to characterize the morphologies and structures of AMOF and AMOF@MMI. Ultraviolet-visible spectroscopy and thermogravimetric analysis were adopted to value the capacity of the load and release of the AMOF, respectively. The mass ratio of loaded MMI molecules was 18.15%. In addition, the inhibition behavior of AMOF@MMI for Cu was evaluated by polarization curves and electrochemical impedance spectroscopy. The results indicated that the AMOF loaded MMI successfully, and the released MMI could adsorb on the Cu surface and inhibit the Cu corrosion. The inhibition efficiency could reach 88.2%. The binding and interaction energies between the AMOF surface and the MMI were −16.41 kJ/mol and −20.27 kJ/mol.Keywords:corrosion inhibitor;ZIF-8;loading and delivery;AMOF;theoretical calculation

Effect of tea-polyphenol/β-cyclodextrin/NaCl inclusion complexes as a salt substitute on quality of low-salt Sichuan-style sausages

Ya Liu,Yueying Zhang,Feiwu Long,Jinrong Bai,Yina Huang,Hong Gao

An abundance of low-salt sausages had emerged in the market as high salt intake may pose health risks to humans while their limited shelf-life becomes an urgent issue. In this study, tea-polyphenol/β-cyclodextrin/NaCl inclusion complexes (ICs) with thermal stability and better antioxidant activity were successfully prepared, their effects on the quality of low-salt sausages were investigated. The sausages were manufactured with the addition of ICs and NaCl with or without tea-polyphenols respectively, and they were stored at 25 °C for 28 days. IC group exhibited significantly lower oxidation of lipids and protein as the tea-polyphenols in the ICs could exert better antioxidant properties because of the special encapsulation structure. Besides, ICs could inhibit the growth of pathogens preventing the off-flavor. Also, ICs promoted the growth of P. pentosaceus with a strong antioxidant capacity in the sausage model, which maintained the existing pleasant flavor by preventing the oxidation of phenol and alcohol compounds. Meanwhile, ICs also accelerated the growth of Tetragenococcus , which contributed to flavor development at the later stages of fermentation by producing more esters. Hence, it was suggested that ICs could be utilized as a promising salt replacement to improve the quality of traditional Sichuan-style sausages.

Protein-protein interactions at high concentrations: Effects of ArgHCl and NaCl on the stability, viscosity and aggregation mechanisms of protein solution

Yalin Ye,Xingli Huo,Zongning Yin

The aim of this work was to use the diffusion coefficient ration (D m /D line ) as a parameter to characterize the stability of protein at high concentration, to compare the effects of ArgHCl and NaCl on the interaction of highly concentrated proteins under different pH conditions, and to explore the correlation with protein stability. For this purpose, a high-concentration bovine serum albumin solution (BSA) was selected as the model system, and the diffusion coefficient, aggregation degree, conformational stability, and solution viscosity of the protein were studied by dynamic light scattering (DLS) and spectral detection techniques. The result showed that there was a significant correlation between the D m /D line and the protein aggregation. The D m /D line of the protein was minimum at pH 7.4, which corresponded to the maximum degree of aggregation and the highest solution viscosity. At pH 7.4, the hydrophobic interactions and the increased conformational stability of ArgHCl maximized the stability of the protein and reduced the viscosity of the solution by 69.3%. At pH 3.0, the strong charge shielding effect of ArgHCl and NaCl and the decreased conformational stability induced protein aggregation and the gel formation. These findings provided valuable insights into the mechanism of protein aggregation and the diffusion coefficient ration (D m /D line ) could be a potential tool for the pre-formulation studies.

Differentiation of NaCl, NaOH, and β-Phenylethylamine Using Ultraviolet Spectroscopy and Improved Adaptive Artificial Bee Colony Combined with BP-ANN Algorithm

Angxin Tong,Xiaojun Tang,Haibin Liu,Honghu Gao,Xiaofei Kou,Qiang Zhang

The aim of this study is to enhance the classification performance of the back-propagation-artificial neural network (BP-ANN) algorithm for NaCl, NaOH, β-phenylethylamine (PEA), and their mixture, as well as to avoid the defects of the artificial bee colony (ABC) algorithm such as prematurity and local optimization. In this paper, a method that combined an improved adaptive artificial bee colony (IAABC) algorithm and BP-ANN algorithm was proposed. This method improved the ABC algorithm by adding an adaptive local search factor and mutation factor; meanwhile, it can enhance the abilities of the global optimization and local search of the ABC algorithm and avoid prematurity. The extracted score vectors of the principal component of the ultraviolet (UV) spectrum were used as the input variable of the BP-ANN algorithm. The IAABC algorithm was used to optimize the weight and threshold of the BP-ANN algorithm, and the iterative algorithm was repeated until the output accuracy was reached. The output variable was the classification results of NaCl, NaOH, PEA, and the mixture. Meanwhile, the proposed IAABC-BP-ANN algorithm was compared with discriminant analysis (DA), sigmaid-support vector machine (SVM), radial basis function-SVM (RBF-SVM), BP-ANN, and ABC-BP-ANN. Then, the above algorithms were used to classify NaCl, NaOH, PEA, and the mixture, respectively. In the experiment, four indicators, accuracy, recall, precision, and F-score, were used as the evaluation criteria. In addition, the regression equation parameters of the mixture for the testing set were obtained by BP-ANN, ABC-BP-ANN, and IAABC-BP-ANN models. All of the results showed that IAABC-BP-ANN exhibits better performance than other algorithms. Therefore, IAABC-BP-ANN combined with UV spectroscopy is a potential identification tool for the detection of NaCl, NaOH, PEA, and the mixture.

Preparation of N-doped porous carbon matrix in a solid–liquid coexisted NaCl template and its applications in Li–S batteries

Wang Yang,Liang Xin,Wu Xiaolong,Wang Lulu,Xu Kun,Sun Yi,Wang Jiazhao,Xiang Hongfa

Li–S batteries have been considered as the most desirable candidate for next-generation batteries because of their high energy density and low cost, although the problems of the insulating nature of S and Li 2 S and the “shuttle effect” of polysulfides in Li–S batteries have to be addressed. In this work, we propose NaCl templates and a solid–liquid coexistence strategy to synthesize an N-doped carbon matrix with interconnected micro-mesoporous structure. Benefiting from the critical state of solid–liquid coexistence at the melting point of NaCl and a pretreatment by pressure, a unique porous structure with an interconnected network of micropores and mesopores is obtained. The micropores can prevent the dissolution of polysulfides, the mesopores can increase the S loading, and the interconnected pore network can significantly improve the usage of active materials. As a result, the cathode with the N-doped carbon matrix shows improved electrochemical performances.

Corrosion behavior of Fe-37 wt% Ni in molten NaCl-MgCl2 and the effects of alloy element Sc on its corrosion resistance

Jun Wei Wang,Zelong Bao,Rong Qiao Xiang,Gao Hao Hu,Yong Kang Hu,Qing Ma,Bin Li,Hong Guang Jia

As a solar energy storage medium or heat transfer medium at moderate-high temperature, the molten NaCl-MgCl 2 has the advantages of high stability and low cost. But a pipe and container material with Cr will be corroded badly in a molten chloride. Based on the founded corrosion resistance phase (Fe 0.64 Ni 0.36 ) in previous experiments, the corrosion behavior of a new alloy of Fe-37 wt% Ni with rare earth alloy element Sc in the molten eutectic NaCl-MgCl 2 at 520 °C was studied. The corrosion rate of the Fe-37 wt% Ni alloy is lower than that of the researched Fe-based superalloys (GH1035 and GH1140). After corrosion for 15 h, a porous structure with Ni-rich and Fe-depletion is formed at the local location on the Fe-37 wt% Ni surface. For the specimens with Sc (0.3 and 0.5 wt %), a compact protective MgO layer covers on the porous structure, which prevents further corrosion in the molten salt . It is speculated that the Sc is oxidized to Sc 2 O 3 directly or by the chlorination-oxidation reactions, which improves the adhesion strength between the MgO layer and the alloy matrix by the effects of inhomogeneous nucleation and pinning.

Water-induced self-assembly of agar with NaCl sacrificial crystalline support toward heterostructure carbon aerogels for lightweight and broadband electromagnetic wave absorption

Hao Xu,Yanan Zheng,Guangling He,Xiaohui Jiang,Xuefeng Yan,Liangmin Yu

Carbon-based materials, owing to their abundance, highly tunable dielectric constants, and easily controllable microstructures, are among the most important electromagnetic wave (EMW) absorbing materials. However, they still suffer from the limitation of a narrow effective absorption bandwidth (EAB). In this work, we propose a water-induced self-assembly strategy of agar with NaCl sacrificial crystalline support to construct agar aerogel-derived porous carbon (AAPC) featuring hierarchical porosity, heteroatom doping, and conductive networks for lightweight and broadband electromagnetic wave absorption. Under conditions of low density (11.08 mg/cm3) and a low filling ratio (2 %), AAPC 4 –700 achieves an EAB of 7.68 GHz at a thickness of 2.55 mm, with a minimum reflection loss (RL min ) of −50.0 dB. In addition, AAPC exhibits excellent thermal insulation and flame-retardant properties, enabling its potential application in extreme environments. This study elucidates the EMW dissipation mechanism of AAPC and opens a new pathway for the design of lightweight EMW absorbers with broad EAB.

Direct synthesis of 3D hierarchically porous carbon/Sn composites via in situ generated NaCl crystals as templates for potassium-ion batteries anode

Kangsheng Huang,Zheng Xing,Liancheng Wang,Xuan Wu,Wei Zhao,Xiujun Qi,Hong Wang,Zhicheng Ju

It has been approved that embedding potassium ions into graphitic carbon interlayer is possible. The intercalation of potassium ions into graphite has been demonstrated feasible while the electrochemical performance of potassium ion battery (PIB) is still unsatisfying. Herein, an in situ formed NaCl serving as hierarchical templates and supporting the formation of 3D polymer–Sn complex is reported. The polymer–Sn complex is heat-treated to obtain a 3D Carbon/Sn network constructed by porous films. In particular, the large specific surface area of the composite and the Sn nanoparticles homogeneously embedded in 3D hierarchically porous carbon shells result in an excellent potassiation/depotassiation performance. Under the optimal conditions (650 °C), the 3D hierarchically porous carbon/Sn composite (3D-HPCS) as an anode material of PIBs demonstrates a high reversible capacity of 276.4 mA h g−1 at 50 mA g−1 (100 cycles) with coulombic efficiency of over 96%. This interesting method can provide new avenues to other high-capacity anode material systems that are subject to significant volume expansion.

Glycerol/NaCl-Regulated Poly(vinyl alcohol)/Sodium Alginate/Graphene Oxide Composite Gels with Low-Temperature Flexibility and a Strain-Dependent Resistance Response

Flexible gel sensors can lose mechanical compliance and electrical stability at low temperature or during solvent loss. A poly(vinyl alcohol) (PVA)/sodium alginate (SA)/graphene oxide (GO) composite gel was prepared by freeze–thaw cycling and post-treated in either aqueous NaCl or a NaCl-containing water/glycerol mixture (1:2,v/v). The water/glycerol–NaCl-treated gel (F-G/S/P/G) exhibited a maximum tensile stress of 428 ± 27 kPa and an elongation at break of 432 ± 27% at room temperature (n= 3), and remained visibly deformable after 24 h at −20 °C. During ambient storage, it retained approximately 89% of its initial mass after 35 days. The cycle-averaged peak ΔR/R0increased from 0.135 at 20% strain to 1.142 at 250% strain, and the 20–60% linear region gave a gauge factor of 1.01 (R2= 0.9988). Three independently prepared sensing elements gave a peak ΔR/R0of 0.710 ± 0.019 at 100% strain, with response and recovery times of 1.22 ± 0.07 and 1.04 ± 0.06 s, respectively. After 500 cycles at 100% strain, the normalized peak response retained 95.1% of its initial value. Overall, F-G/S/P/G combined low-temperature deformability, ambient-storage mass retention, and repeatable resistance sensing.

Mechanism insights into NaCl-regulated molecular aggregation and crosslinking during Antarctic krill (Euphausia superba) surimi gelation: A comparative study with Litopenaeus vannamei

Jiajun Pan,Xinmiao Wang,Xiaoming Guo,Beiwei Zhu,Zonghan Wang

NaCl regulates the aggregation-crosslinking balance of AK proteins during gelation. • A balanced two-stage aggregation ratio (∼0.85) yields the optimal gel texture. • Excessive NaCl (>3.0%) induces premature aggregation that impairs gel networks. • AK proteins show higher salt–heat sensitivity in thermal-aggregation than LV. Antarctic krill ( Euphausia superba ) represents a vast yet underutilized marine protein resource; however, its inherently weak and unstable gelation properties hinder its broad industrial application. The primary objective of this study was to systematically investigate how NaCl (1–3.5%, w/w) modulates protein aggregation and crosslinking during the thermal gelation of Antarctic krill surimi. Using Litopenaeus vannamei as a reference, a multi-scale analysis showed that 2.5% NaCl produced optimal gel texture (2.56 N for Antarctic krill; 25.84 N for Litopenaeus vannamei ). Rheology revealed a three-stage gelation process with stronger elastic reinforcement in Litopenaeus vannamei . AFM analysis demonstrated that NaCl promoted protein aggregation during two-stage heating, with more pronounced aggregation observed in krill proteins. An aggregation efficiency of ∼0.85 yielded the best gel performance, underscoring that network formation benefits from progressive aggregation dynamics rather than runaway cluster growth. These findings provide a theoretical basis for enhancing the quality of krill-based foods. Download: Download high-res image (462KB) Download: Download full-size image

5Y–ZrO2 NPs with high dispersity and excellent sintering performance prepared by a novel sol-gel-flux method in the NaCl system

Nan Li,Hongju Qiu,Lei Gao,Zhipeng Xie,Yunlong He,Yan Jiang,Guo Chen

Herein, to alleviate the hard agglomeration of ZrO 2 nanoparticles (NPs) fabricated by the traditional sol-gel method (SGM), a novel sol-gel-flux method (SGFM) is applied to tailor ZrO 2 nanoparticles (NPs) stabilized by 5 mol% Y 2 O 3 (5Y–ZrO 2 ) by in situ introduction of NaCl NPs among xerogel particles. The phase composition, micromorphology, surface area, and sintering performances of 5Y–ZrO 2 products fabricated by SGM and SGFM are compared. The effects of calcination temperature on the phase composition, micromorphology, and particle size of 5Y–ZrO 2 products prepared by SGFM are systematically investigated. The results show that the 5Y–ZrO 2 particles prepared by SGM are severely agglomerated and irregular, while the 5Y–ZrO 2 NPs prepared by SGFM are well dispersed, uniformly distributed, and quasispherical. The former can hardly be densified by sintering, while the latter shows excellent sintering performance. By sintering 5Y–ZrO 2 NPs prepared by SGFM at 1200 °C for 3 h, 5Y-TZP with a high density and an average grain size of 0.29 μm is fabricated. The in situ generated NaCl particles effectively separate ZrO 2 particles during sintering. The calcination temperature plays a crucial role in controlling the phase composition, agglomeration degree, micromorphology, particle size distribution , and particle size of 5Y–ZrO 2 products synthesized by SGFM, and the optimal calcination temperature is suggested to be 790 °C.