An efficient approach to fabricate lightweight polyimide/aramid sponge with excellent heat insulation and sound absorption performance

Shunxi Song,Yujie Shi,Jiaojun Tan,Zeshi Wu,Meiyun Zhang,Sheng Qiang,Jingyi Nie,Haitang Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

Polyimide sponges have bright prospects in the weight reduction, heat insulation, and sound absorptionequipment of aerospace, navigation, and other area due to their unique three-dimensional cellular structureand outstanding comprehensive performance. However, most polyimide sponges suffered from longand complex fabrication processes. Herein, an efficient and scalable approach, i.e. water-based foamforming, was proposed to fabricate ultralight and porous polyimide/aramid sponges (PASG). Attributedto the bubble-template nature of foam-forming, PASGs exhibit high porosity (>99%) and ultra-low density(10 mg/cm3), and possess excellent thermal and sound insulation performance with an optimum thermalconductivity of 34.89 mW/mK and noise reduction coefficient of 0.41. Besides, PASGs demonstrateoutstanding mechanical properties after 500 compression cycles. This strategy providing more possibilitiesfor developing the next generation of high-performance thermal insulation and noise reductionmaterials.

Renewable low-cost brassica rapa subsp. Extract for protection of Q235 steel in H2SO4 medium: Experimental and modeling studies

Xiuquan Yao,Yujie Qiang,Lei Guo,Qian Xu,Lei Wen,Ying Jin 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

The research aims to explore the corrosion protection performance and mechanism of the Brassica rapasubsp. extract (BRE) considered as a new environmental protection corrosion inhibitor. In this research,the inhibition performance of BRE toward Q235 steel in H2SO4 solution was evaluated through combiningpotentiodynamic polarization and electrochemical impedance. The results showed that the BRE moleculescould form a dense protective film on steel surface, effectively preventing from the attack of corrosiveions. Specifically, the inhibition efficiency brought by 200 mg/L of BRE at each temperature exceeded93 %. The results of Fourier transform infrared spectroscopy (FTIR) and UV–vis spectroscopy showed thatthe BRE molecules was well adsorbed on the steel surface. In the meantime, the results of N-Fe bond of Xrayphotoelectron spectroscopy (XPS) indicated that the nitrogen-atom in BRE molecules worked as theactive site to form multiple anchoring effects in Q235 steel. Calculations based on density functional theory(DFT) and molecular dynamics (MD) simulations have theoretically revealed the adsorption mechanismof BRE on the surface of Q235 steel at the molecular/atomic level.

Evaluating the synergistic effect of maple leaves extract and iodide ions on corrosion inhibition of Q235 steel in H2SO4 solution

Yue Wang,Yujie Qiang,Hui Zhi,Boyuan Ran,Dawei Zhang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-

In recent years, many plant extracts have been used as green corrosion inhibitors to replace traditionalcorrosion inhibitors, but their inhibition performance still needs to be improved. The synergistic corrosioninhibition behavior and mechanism of maple leaves extract (MLE) and potassium iodide (KI) onQ235 steel in 0.5 M H2SO4 solution were firstly investigated in this work. The results demonstrate thatboth MLE and KI can prevent the corrosion of steel in corrosive media, and that their combined protectioneffect is superior. The corrosion inhibition efficiency (g) value reaches 93.4 % in corrosive solution withthe combination of 200 mg/L MLE and 200 mg/L KI, while the maximum of g is only 81.6 % using MLEalone. In addition, Fe-N bond and Fe-O bond were found on the steel surface through the X-ray photoelectronspectroscopy (XPS) analysis, which confirm the formation of a protective film. The adsorption behaviorof an inhibitory film composed of MLE and KI mixtures onto steel surface follows the Langmuiradsorption isotherm model, consisting of physisorption and chemisorption. Finally, molecular dynamics(MD) simulation indicates that inhibitor molecules can adsorb on the Fe substrate in a parallel way withhigh binding energy values, which supports the experiments well.

Microfluidic Synthesis of Hybrid Nanoparticles with Controlled Lipid Layers: Understanding Flexibility-Regulated Cell–Nanoparticle Interaction

Zhang, Lu,Feng, Qiang,Wang, Jiuling,Zhang, Shuai,Ding, Baoquan,Wei, Yujie,Dong, Mingdong,Ryu, Ji-Young,Yoon, Tae-Young,Shi, Xinghua,Sun, Jiashu,Jiang, Xingyu American Chemical Society 2015 ACS NANO Vol.9 No.10

<P>The functionalized lipid shell of hybrid nanoparticles plays an important role for improving their biocompatibility and <I>in vivo</I> stability. Yet few efforts have been made to critically examine the shell structure of nanoparticles and its effect on cell–particle interaction. Here we develop a microfluidic chip allowing for the synthesis of structurally well-defined lipid-polymer nanoparticles of the same sizes, but covered with either lipid-monolayer-shell (MPs, monolayer nanoparticles) or lipid-bilayer-shell (BPs, bilayer nanoparticles). Atomic force microscope and atomistic simulations reveal that MPs have a lower flexibility than BPs, resulting in a more efficient cellular uptake and thus anticancer effect than BPs do. This flexibility-regulated cell–particle interaction may have important implications for designing drug nanocarriers.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-10/acsnano.5b05792/production/images/medium/nn-2015-05792e_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b05792'>ACS Electronic Supporting Info</A></P>

Superhydrophobic and smart MgAl-LDH anti-corrosion coating on AZ31 Mg surface

Manyi Huang,Guangming Lu,Jibin Pu,Yujie Qiang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.103 No.-

Layered double hydroxides (LDHs) have been widely used as ‘‘smart” containers in the field of metal corrosionprotection, and have broad industrial prospects. It is environmentally friendly and feasible to usealiphatic carboxylates and corresponding acids as substitutes for harmful corrosion inhibitors. However,previous studies rarely involved comparing the anti-corrosion mechanisms of different aliphatic acidsmodified on the LDH surface, and the durability of the prepared coatings also needs to be improved. Inthis work, MgAl-LDH laminates were grown in situ on AZ31 substrates by a hydrothermal method,and then modified by sodium laurate (SL) and sodium dodecylbenzene sulfonate (SDBS). Due to the physicalbarrier effect of the LDH layers, the spatial repulsion effect of the air film and the ion exchange reactionsin the interlayer galleries, the functional coatings prepared exhibit smart and superior anticorrosionperformance on the magnesium substrates in 3.5 wt.% NaCl solution. Compared with LDHSDBS-8 coating, the obtained superhydrophobic LDH-SL-8 coating shows more excellent long-term corrosionprotection owing to the stronger intercalation capacity.

Experimental and theoretical studies on inhibition performance of Cu corrosion in 0.5 M H2SO4 by three disulfide derivatives

Bochuan Tan,Shengtao Zhang,Wenpo Li,Xiuli Zuo,Yujie Qiang,Lihui Xu,Jiangyu Hao,Shijin Chen 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-

Phenyl disulfide (PDF), 2,20-dithiodipyridine (DDP), 5,5-dithiobis(1-phenyl-1H-tetrazole) (DPT) werestudied as inhibitors for Cu in H2SO4 via electrochemical methods, surface morphology analysis andtheoretical calculations. Electrochemical experiments show that PDF, DDP and DPT can exhibit excellentcorrosion inhibition performance. Their order of corrosion inhibition is DPT > DDP > PDF. Surfacemorphology analysis supports the electrochemical results. The X-ray photoelectron spectroscopy (XPS)results show that S Cu bonds are detected in PDF, DDP and DPT, and N Cu bonds are detected in DDPand DPT. PDF, DDP and DPT adsorption on the Cu surface obey the Langmuir isotherm model. The resultsof quantum chemical calculations show that DPT has more active reaction sites than DDP and PDF. Molecular dynamics simulation results show that the order of binding energies of the three corrosioninhibitor molecules on the copper surface is DPT > DDP > PDF.

NLRP3-dependent lipid droplet formation contributes to posthemorrhagic hydrocephalus by increasing the permeability of the blood–cerebrospinal fluid barrier in the choroid plexus

Zhang Zhaoqi,Guo Peiwen,Liang Liang,Jila Shiju,Ru Xufang,Zhang Qiang,Chen Jingyu,Chen Zhi,Feng Hua,Chen Yujie 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-

Hydrocephalus is a severe complication that can result from intracerebral hemorrhage, especially if this hemorrhage extends into the ventricles. Our previous study indicated that the NLRP3 inflammasome mediates cerebrospinal fluid hypersecretion in the choroid plexus epithelium. However, the pathogenesis of posthemorrhagic hydrocephalus remains unclear, and therapeutic strategies for prevention and treatment are lacking. In this study, an Nlrp3−/− rat model of intracerebral hemorrhage with ventricular extension and primary choroid plexus epithelial cell culture were used to investigate the potential effects of NLRP3-dependent lipid droplet formation and its role in the pathogenesis of posthemorrhagic hydrocephalus. The data indicated that NLRP3-mediated dysfunction of the blood–cerebrospinal fluid barrier (B-CSFB) accelerated neurological deficits and hydrocephalus, at least in part, through the formation of lipid droplets in the choroid plexus; these lipid droplets interacted with mitochondria and increased the release of mitochondrial reactive oxygen species that destroyed tight junctions in the choroid plexus after intracerebral hemorrhage with ventricular extension. This study broadens the current understanding of the relationship among NLRP3, lipid droplets and the B-CSFB and provides a new therapeutic target for the treatment of posthemorrhagic hydrocephalus. Strategies to protect the B-CSFB may be effective therapeutic approaches for posthemorrhagic hydrocephalus.