WEAR
·
2022
·
IF 4.695
Ye-wei Zhang,Qing Zhang,Yu-xing Peng,Chen Wang,Xiang-dong Chang,Guo-an Chen
The operating conditions of hoisting wire ropes are extremely harsh in coal mines, which often accelerates wear due to lubrication failure. This paper starts with the modification of lubricating oil to improve the service life of wire ropes in mine hoists under severe working conditions. First, the modification methods of octadecylamine functionalized graphene oxide (ODA-GO) and its reduced product by hydrazine hydrate (ODA-rGO) were introduced, followed by characterization with Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), X-Ray diffraction (XRD), Raman spectroscopy , thermogravimetric (TG) spectroscopy and transmission electron microscope (TEM). Then, the dispersion stabilities of these additives in IRIS-550A lube oil (IRIS) were recorded and quantitatively analysed by a UV–Vis spectrophotometer. Finally, the tribological properties of ODA-GO- and ODA-rGO-modified oils were evaluated through a four-ball tribotester, and ODA-GO-modified oil was further tested using a wire rope sliding wear rig under different contact loads and sliding speeds. The results show that octadecylamine is attached to graphene oxide (GO) through covalent bonds . ODA-GO shows a better dispersion stability in IRIS than ODA-rGO due to its high concentration of octadecyl chains. The coefficient of friction (CoF) between wire ropes varies under different test conditions, but the wear is reduced in all cases.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 19
·52115
·
IF 3.057
Chuying Zhang,Hang Zhao,Fan Yang,Na Zhang,Tongguang Zhu,Kunyue Leng,Jinbo Bai
The addition of inorganic particles can endow polymer matrices with different new features, thereby realizing an optimization to the structural and functional properties of composite. The overall properties of composites are greatly influenced by both fillers dispersion and fillers-polymer interfacial interaction. However, to simultaneously improve these mentioned two issues is still a critical challenge in the field of polymer-based nanocomposite. Herein, a typical core-shell structured mesoporous silica-coated silica (SiO 2 @mSiO 2 ) construction was successfully synthesized by using a bi-phase method. The SiO 2 @mSiO 2 filled polyethylene (PE) nanocomposite was fabricated through a precisely controlled melt-mixing approach. Benefiting from the additional mesoporous SiO 2 shell, both the dispersion of SiO 2 @mSiO 2 and the SiO 2 @mSiO 2 -PE matrix interfacial interaction are improved. Moreover, the stress–strain behavior, temperature-dependent mechanical property, thermal stability, and electrical insulating property of SiO 2 @mSiO 2 /PE composite were studied in detail. It is found that SiO 2 @mSiO 2 core-shell nanoparticles are capable of not only making a balance between the strength and toughness of the PE-based composite, but also improving the thermal stability of the composite. In addition, the SiO 2 @mSiO 2 /PE composite exhibited an enhanced breakdown strength (256.4 MV·m −1 ) when filled with as small as 1 wt% SiO 2 @mSiO 2 , which is 108% higher than neat PE. All these optimized features are attributed to the well-designed core-shell structure. These experimental results provide a promising way to design and fabricate future advanced composite with excellent structural and functional properties in the future.
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高影响因子
CARBON
·
2023
·
IF 10.9
Xin Lai,Jianfeng Hu,Jinqing Qu
Conferring versatility to the epoxy (EP) coating is highly desirable to achieve long-term corrosion resistance . In this work, a simple and effective strategy is reported to integrate corrosion protection , superhydrophobicity, and photothermal conversion into EP coating. Specifically, a functional filler based on graphene nanoplatelet is fabricated by the anchoring of polytannic acid and the grafting reaction of octadecylamine. The good interface compatibility, excellent adhesive strength (4.8 MPa), and stable superhydrophobicity (water contact angle of 152.4° and water sliding angle of 7.4°) provide a reinforced barrier effect (low water absorption and low permeability of oxygen and chloride ions), resulting in the impedance modulus of the composite coating being nearly three orders of magnitude higher than that of the pure EP coating after 28 days of immersion in 3.5 wt% NaCl solution. Furthermore, the surface temperature rises rapidly to 78.4 °C within 2 min under the sunlight of 200 mW/cm 2 , demonstrating the efficient photothermal conversion capability of the composite coating and accelerating the evaporation of water from the coating surface . Gratifying, the superhydrophobic property of the composite coating can be restored even after the salt spray test, which is attributed to the migration of long-chain alkyl under sunlight irradiation. Therefore, the prepared composite coating with photothermal conversion and superhydrophobic performance is expected to be a promising candidate for long-lasting corrosion protection under harsh application environments.
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高影响因子
CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Jinhui Lu,Xiaomeng Zhu,Meng Zhang,Xunchan Jiang,Wei Guo,Feng Jiang,Feng Cao
Investigating the structural integrity of carriers in transit from ocular surface to ocular posterior segment is essential for an efficient topical drug delivery system. In this study, dual-carrier hydroxypropyl-β-cyclodextrin [email protected] ( [email protected] ) nanocomposites were developed for the efficient delivery of dexamethasone . Förster Resonance Energy Transfer with near-infrared I fluorescent dyes and in vivo imaging system were used to investigate the structural integrity of [email protected] nanocomposites after crossing Human conjunctival epithelial cells (HConEpiC) monolayer and in ocular tissues. The structural integrity of inner HPCD complexes was monitored for the first time. The results suggested that 23.1 ± 6.4 % of nanocomposites and 41.2 ± 4.3 % of HPCD complexes could cross HConEpiC monolayer with an intact structure at 1 h. 15.3 ± 8.4 % of intact nanocomposites could reach at least sclera and 22.9 ± 1.2 % of intact HPCD complexes could reach choroid-retina after 60 min in vivo , which showed that the dual-carrier drug delivery system could successfully deliver intact cyclodextrin complexes to ocular posterior segment. In conclusion, in vivo assessment of structural integrity of nanocarriers is greatly significant for guiding the rational design, higher drug delivery efficiency and clinical transformation for topical drug delivery system to the posterior segment of the eye.
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PubMed
高影响因子
JOURNAL OF CONTROLLED RELEASE
·
2023
·
IF 10.8
Chang Ni,Zijun Zhang,Yuling Wang,Zhenhai Zhang,Xueping Guo,Huixia Lv
Hyaluronic acid (HA) has been widely used in cosmetics and topical preparations owing to its favorable moisturizing property and potential in enhancing drugs' skin permeability. Here, the influencing factors and underlying mechanism of HA on skin penetration were carefully investigated, and HA-modified Undecylenoyl-Phenylalanine (UP) liposomes (HA-UP-LPs) were designed as a proof of principle for efficacious transdermal drug delivery strategy to enhance the skin penetration and retention. An in vitro penetration test (IVPT) of HA with different molecular weights showed that low molecular weight HA (LMW-HA, 5 kDa and 8 kDa) could pass through the stratum corneum (SC) barrier and enter into the epidermis and dermis layers, whereas its high molecular counterparts (HMW-HA) were trapped on the SC surface. Mechanistic studies revealed that LMW-HA could interact with keratin and lipid in the SC meanwhile exerted a substantial skin hydration effect, which may partially contribute to the SC penetration benefit. In addition, the surface decoration of HA drove an energy-dependent caveolae/lipid raft-mediated endocytosis of the liposomes through direct binding to the CD44 receptors widely expressed on skin cell membranes . Notably, IVPT showed a 1.36-fold and 4.86-fold increase in skin retention of UP and a 1.62-fold and 5.41-fold increase in skin penetration of UP with HA-UP-LPs over UP-LPs and free UP at 24 h, respectively. As a result, the anionic HA-UP-LPs (−30.0 mV) showed enhanced drug skin penetration and retention compared with conventional cationic bared UP-LPs (+21.3 mV) on both in vitro mini-pig skin as well as in vivo mouse skin. Overall, the usage of LMW-HA might offer opportunities in developing novel topical preparations and skin care products with improved transdermal penetration and retention.
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PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 23
·4174
·
IF 4.329
Yu Sun,Tao Li,Haiyang Dai,Manman Wang,Renzhong Xue,Jing Chen,Dewei Liu
Three fluorinated polyimide (PI-FP, PI-FO and PI-FH) films with low dielectric constants and excellent comprehensive properties were successfully prepared using a polycondensation reaction method by incorporating p-phenylenediamine (PDA), 4-4′-diaminodiphenyl ether (ODA) and 4,4′-(Hexafluoroisopropylidene) bis (p-phenyleneoxy) dianiline (HFPBDA) into 4,4′-(Hexafluoroisopropylidene) diphthalic anhydride (6FDA), respectively. The effects of the diamine monomer structure on optical, dielectric and mechanical properties were investigated. Compared with PDA and ODA, HFPBDA can effectively improve the optical and dielectric properties of PI due to due to its special chain structure. Among the three PI films, PI-FH film presents the best optic transmission (highest transmittance = 90.2%) and highest energy gap (2.69 eV). The dielectric properties of PI-FH film improve the most. The dielectric constant and loss at 104Hz are reduced to 2.05 and 0.0034 at 104Hz, respectively, and remain stable up to 250 °C. The mechanical properties decrease in turn for PI-FP, PI-FO and PI-FH films due to the increase in free volume fraction. Nevertheless, PI-FH film still exhibits good mechanical properties with a tensile strength of 88.4 Mpa, a tensile modulus of 2.11 GPa and an elongation at break of 4.1%. The correlation between the dielectric and mechanical properties of PI films and their free volume characteristics is well explained with the help of positron annihilation spectroscopy.Keywords:polyimide;low dielectric constants;positron annihilation;free volume fraction
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PubMed
高影响因子
CELLULOSE
·
2021
·Vol. 29
·期 2
·1175-1187
·
IF 5.044
Cheng Wei,Liu Wenjing,Wang Qiang,Wang Ping,Zhou Man,Yu Yuanyuan
Antibacterial textiles cannot prevent the dirty liquid containing bacteria from passing through the fabrics to reach the human skin, and cannot effectively protect human health. To enhance the antibacterial function of the fabric, a dual-function cotton fabric with hydrophobic and antibacterial properties, cotton@PDA@AgNPs@ODA, was prepared via in situ surface assembly of polydopamine (PDA), Ag nanoparticles (AgNPs) and octadecylamine (ODA). Polydopamine (PDA) was deposited on raw cotton fabric. AgNPs were introduced to the surface PDA coating of the fabric by in situ reduction of AgNO 3 with reducibility of catechol moieties in PDA. Subsequently, octadecylamine (ODA) was grafted onto PDA by Michael addition/Schiff base reaction. Water contact angle of Cotton@PDA@AgNPs@ODA was 130° at 10 min of drop contact time, showing good hydrophobicity. The antibacterial rates of Cotton@PDA@AgNPs@ODA against Escherichia coli and Staphylococcus aureus were above 99%, and the modified fabric had good bacterial liquid shielding function. Furthermore, the PDA/AgNPs/ODA coating had good fastness under washing, mechanical abrasion and strong acid/alkaline conditions.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Meizhou Sun,Jiliang Zheng,Xinghuan Liu,Tingting Yu,Hengfei Zhang,Wenda Yang,Rongjie Wang,Xin Jia
The wettability of the coating used in controlled release fertilizers (CRFs) is a crucial parameter for the release behavior of nutrients. However, how to control the wettability of coating to tune nutrient release is a big challenge. Herein, the alkylamine-poly (tannic acid) (APTA) building blocks coatings with controlled wettability were prepared as coating materials for CRFs. Alkylamine (octadecylamine (ODA), hexadecylamine (HDA), dodecylamine (DDA), and hexylamine (HEA)) were applied for the modification of poly (tannic acid) (PTA) coating on the silicon wafer and urea surface. The wettability of coatings on silicon wafers were studied and nutrient release of APTA coated fertilizers were characterized in water and soil. The nitrogen nutrient and water vapor permeability coefficient of coatings were characterisized and the mathematical model for predicting the release of nutrients in soil. The alkyl chain length of alkylamine is demonstrated to play a crucial part in controlling the wettability. The rate of nutrient release increases in the order of ODA-PTA < HDA-PTA < DDA-PTA < HEA-PTA coated fertilizer. We envision that APTA building blocks with diverse wettability on urea surface could control the release rate of the nutritional content of fertilizer, which has potential application in the development of controlled-release fertilizers.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Pan-Pan Zhao,Cong Deng,Ze-Yong Zhao,Xing-Yu Li,Hong Chen,Yu-Zhong Wang
More than 40% of the energy generated globally is consumed by residential and commercial buildings, so energy efficient materials for buildings are urgently needed at present. On-demand thermal energy storage/release using phase change materials (PCMs) can improve thermal energy utilization efficiency, however, they are facing low adaptability to temperature and easy flammability in the case of fulfilling high thermal management capacity. Herein, we report octadecylamine-based PCMs with tailor-made molecular firefighting and thermal energy management capability. These synthesized octadecylamine-based Schiff base-containing PCMs (SB-PCMs) may self-extinguish while encountering short-time fire and possess variable phase transition temperatures of 33, 42, 92, and 101 °C. Meanwhile, these SB-PCMs own high phase transition enthalpies of 161.4–183.4 J g −1 and excellent cyclic stability. When SB-PCMs as thermal energy management materials in wood plastic-based building materials, they show high adaptability to ambient temperature and excellent thermal management capability, achieving temperature regulation of 9.0 °C. Meanwhile, fire safety of the composite wood plastic materials is significantly improved. Detailed analysis confirms that the incorporated benzaldehyde with various positional substituted hydroxyl may induce noncovalent interactions (mainly hydrogen bond and π-π stacking) of SB-PCMs and further control their self-assembling processes, thus achieving multiple thermal responses of SB-PCMs; self-crosslinking charring of benzaldehyde-based Schiff base structure may retard fire spreading, therefore presenting molecular firefighting. Additional multistage thermochromic behaviors of SB-PCMs may extend their application in temperature-sensitive paint, intelligent fabric, etc. This work firstly represents a method for manipulating the multistage thermal and fire responses of PCM in the case of fulfilling high thermal energy management capacity and confirms its molecular-firefighting and energy efficient application in building materials.
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高影响因子
Advanced Healthcare Materials
·
2021
·Vol. 11
·期 6
·2101496
·
IF 9.933
Ya-Nan Tan,Jian-Dong Huang,Yong-Peng Li,Shan-Shan Li,Min Luo,Jie Luo,Anne Wing-Mui Lee,Li Fu,Fu-Qiang Hu,Xin-Yuan Guan
The major obstacles of anti-PD therapy in metastatic tumors are limited drug delivery in primary tumors and metastatic foci, and the lack of tumor-infiltrating lymphocytes (TILs). Here, the authors constructed a novel cellular membrane nanovesicles platform (M/IR NPs) based on homologous targeting and near-infrared (NIR) responsive release strategy to potentiate PD-1/PD-L1 blockade therapy against metastatic tumors. In tumor-bearing mice, biomimetic M/IR NPs targeted both primary tumors and their lung metastases. Upon laser irradiation, M/IR NPs reduced cancer-associated fibroblasts (CAFs) in tumor microenvironment, thus increasing the penetration of TILs. When shed from homologous tumor cell membranes, positively charged nanoparticles (IR NPs) core can capture released tumor-associated antigens, thereby enhancing the antigen-presenting ability of DCs to activate cytotoxic T lymphocytes. When the photothermal conversion temperature under NIR-laser is higher than 42 °C, M/IR NPs initiated the rupture of cell membranes and the responsive release of PD-1/PD-L1 inhibitor BMS, which significantly attenuated tumor-associated immunosuppression and synergistically induced T cellular immunity to inhibit the tumor growth and metastasis. Overall, biomimetic M/IR NPs can improve the targeting and therapeutic efficacy of anti-PD therapy in primary tumors and metastases, opening up a new avenue for the diagnosis and treatment of metastatic tumors in the future.
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PubMed
高影响因子
JOURNAL OF DRUG TARGETING
·
2026
·
IF 4.7
Weishuo Ju,Ran Zhang,Jingxuan Guo,Shuo Li,Huimin Zhang,Huijia Song,Yanping Sun,Zibin Gao
Accurately and efficiently assessing drug permeability has emerged as a critical challenge in early drug discovery and development, prompting the development of various models. In this study, a polymer planar biomimetic membrane permeation assay (PPBMPA) model was established using a Transwell chamber, and its permeability assessment capability was evaluated using model drugs with high, medium, and low permeability. The underlying permeation mechanism was also investigated. The results demonstrated that the biomimetic membrane spontaneously differentiated into an intestinal-like structure comprising a hydrated layer, a polymersome layer, and a basal layer, thereby mimicking the sequential process of drug permeation across the mucus layer, intestinal epithelium, interstitial space, and into the bloodstream. This highly biomimetic permeation pattern enabled effective differentiation between high and low absorption drugs, exhibiting a strong correlation with Caco-2 permeability (R2 = 0.85). Collectively, these findings suggest that the novel PPBMPA model holds promise as a reliable tool for rapid and reproducible drug permeability prediction.
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高影响因子
Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 48
·26661-26671
·
IF 11.9
Fan Wu,Hao Li,Jing Tang,Abdul Haleem,Jianming Pan
The development and manufacture of new materials that efficiently extract uranium from seawater and can be easily separated remains a challenge. Inspired by the bubbles generated at the solid interface, this work, for the first time, uses the wettability of the magnetized nanomaterial surface to regulate the growth of the nanobubble template. In this process, hollow polydopamine (PDA) nanospheres, which were functionalized by amidoxime (AO), were cultured. This material integrates hollow polymer nanospheres (HPNs) onto the surface of magnetic carbon nanotubes (m-CNTs) through a one-step in situ process, effectively overcoming the disadvantages of traditional cumbersome production and poor recyclability of HPNs, greatly improving the reusability of the material and reducing the cost, named m-CNTs@H-PDA-AO. The relationship between the surface wettability of CNTs and the morphology of in situ grown HPNs was investigated and a series of adsorption experiments show that m-CNTs@H-PDA-AO could reach a maximum adsorption capacity within 20 min in a 10 mL adsorption solution and within 50 h in a 50 mL adsorption solution, indicating rapid adsorption kinetics. The maximum adsorption capacity of m-CNTs@H-PDA-AO is 381.98 mg g−1 at 298 K. In a mixed solution containing coexisting ions, m-CNTs@H-PDA-AO has good selectivity for uranium and the highest removal efficiency reaches about 84.56%. Furthermore, the adsorption capacity of m-CNTs@H-PDA-AO towards uranium decreases slightly after five adsorption–desorption cycles, indicating good stability and reusability. In summary, this work offers a new approach for the construction of hollow materials using the nanobubble templating method and the development of new sorbents for uranium extraction from seawater with potential applications in high-level radioactive wastewater and other water bodies.
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高影响因子
危险品化学品经营许可证（带存储）