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Rational design of phosphonate/quaternary amine block polymer as an high-efficiency antibacterial coating for metallic substrates

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Journal of Materials Science & Technology 2021年第3期62卷 96-106页

作者： Li Liu Wan Peng Xiao Zhang Jiangmei Peng Pingsheng Liu Jian Shen Jiangsu Collaborative Innovation Center of Biomedical Functional Materials Jiangsu Key Laboratory of Bio-functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing210023PR China Jiangsu Engineering Research Center of Interfacial Chemistry Nanjing UniversityNanjing210093PR China

Developing advanced technologies to address the bacterial associated infections is an urgent requirement for metallic implants and ***,we report a novel phosphonate/quaternary amine block polymer as the high-efficiency antibacterial coating for metallic *** pDEMMP-b-pTMAEMA block polymers that bearing identical phosphonate segments(repeat units of 15)but varied cationic segments(repeat units of 8,45,and 70)were precisely *** cationic polymer coatings were constructed on TC4 substrates based on the strong covalent binding between phosphonate group and metallic *** relationship between the segment chain length of the polymer coating and the antibacterial property endowed to the substrates have been established based on quantitative and qualitative *** showed that the antibacterial rate of the modified TC4 surface were 95.8%of *** and 92.9%of *** cells ***,unlike the cationic free polymer or cationic hydrogels,the surface anchored cationic polymers do compromise the viability of the attached C2C12 cells but without significant *** addition,the phosphonate/quate rnary amine block polymers can be easily constructed on titanium,stainless steel,and Ni/Cr alloy with significantly improved antibacterial property,indicating the generality of the block polymer for surface antibacterial modification of bio-metals.

关键词： Block polymers Polymeric coating metallic substrates Polycations Antibacterial property

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Exploring the mechanisms of calcium carbonate deposition on various substrates with implications for effective anti-scaling material selection

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Petroleum Science 2024年第4期21卷 2870-2880页

作者： Lu Gong Fei-Yi Wu Ming-Fei Pan Jun Huang Hao Zhang Jing-Li Luo Hong-Bo Zeng College of Science China University of Petroleum Beijing Key Laboratory of Optical Detection Technology for Oil and Gas China University of Petroleum Basic Research Center for Energy Interdisciplinary College of Science China University of Petroleum Department of Chemical and Materials Engineering University of Alberta Key Laboratory of High Efficiency and Clean Mechanical Manufacture (Ministry of Education) School of Mechanical Engineering Shandong University

The unexpected scaling phenomena have resulted in significant damages to the oil and gas industries,leading to issues such as heat exchanger failures and pipeline clogging. It is of practical and fundamental importance to understand the scaling mechanisms and develop efficient anti-scaling strategies. However,the underlying surface interaction mechanisms of scalants(e.g., calcite) with various substrates are still not fully understood. In this work, the colloidal probe atomic force microscopy(AFM) technique has been applied to directly quantify the surface forces between calcite particles and different metallic substrates,including carbon steel(CR1018), low alloy steel(4140), stainless steel(SS304) and tungsten carbide,under different water chemistries(i.e., salinity and p H). Measured force profiles revealed that the attractive van der Waals(VDW) interaction contributed to the attachment of the calcium carbonate particles on substrate surfaces, while the repulsive electric double layer(EDL) interactions could inhibit the attachment behaviors. High salinity and acidic p H conditions of aqueous solutions could weaken the EDL repulsion and promote the attachment behavior. The adhesion of calcite particles with CR1018 and4140 substrates was much stronger than that with SS304 and tungsten carbide substrates. The bulk scaling tests in aqueous solutions from an industrial oil production process showed that much more severe scaling behaviors of calcite was detected on CR1018 and 4140 than those on SS304 and tungsten carbide, which agreed with surface force measurement results. Besides, high salinity and acidic p H can significantly enhance the scaling phenomena. This work provides fundamental insights into the scaling mechanisms of calcite at the nanoscale with practical implications for the selection of suitable antiscaling materials in petroleum industries.

关键词： Scaling phenomenon metallic substrates Surface forces Bulk scaling tests

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Research on Ce-Zr compounds on modifying γ-alumina washcoat on FeCrAl foils

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Rare Metals 2005年第4期24卷 306-312页

作者： HUANG Ying SHEN Meiqing WANG Jun JIA Liwei Key Laboratory for Green Chemical Technology of State Education Ministry School of Chemical Engineering ＆ Technology Tianjin UniversityTianjin 300072 China

Ce-Zr compounds such as Cc0.68Zr0.3202 solid solution, Ce/Zr nitrate and CeO2/ZrO2 were added into γ-alumina-based slurries, which were then loaded on FeCrAl foils pretreated at 950℃ and 1100℃. The microstructures and adhesion performance between the substrates and the washcoats were measured by SEM, BET surface area, ultrasonic vibration and thermal shock test. The results show that the addition of Ce0.68Zr0.32O2 solid solution, Ce/Zr nitrate and CeO2/ZrO2 into the slurries can improve γ-Al2O3-based washcoat adhesion on FeCrAl foils. Furthermore, ceria-zirconia solid solution increases the adhesion of the washcoat on the surface of an FeCrAl foil than the two others. The specific surface area of this washcoat remains about 4345 m^2/g and the weight loss is below 4.0% even after aging test of 10% steam-containing air at 1050℃ for 20 h.

关键词： chemical reaction engineering γ-alumina washcoat surface area Ce-Zr compounds metallic substrates

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