JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Lu Lai,Xiao-Qian Wei,Wei-Hua Huang,Ping Mei,Zhao-Hua Ren,Yi Liu
The effects of carbon quantum dots (CQDs) on the dynamic properties of bovine serum albumin (BSA) were investigated using pendant drop profile analysis method. Moreover, the effects of CQDs on the competitive adsorption of BSA and dipalmitoyl phosphatidylcholine (DPPC) were examined. CQDs reduce the fluorescence intensity of BSA and cause a red shift in fluorescence emission . The quenching constant at pH 4.3 is almost twice as large as that of the value obtained at pH 6.0. A small amount of CQDs does not influence the dynamic surface adsorption properties of BSA molecules. As the CQD concentration increases, a gradual increase in adsorption rate of BSA molecules is observed. Moreover, the addition of CQDs results in a significant transition of kinetic dependencies of surface elasticity of BSA solution when the CQD concentration exceeds a critical value. The appearance of the maximum surface elasticity value is probably attributed to the formation of tails and loops. When the dynamic surface properties are dominated by BSA molecules, the effects of CQDs on the surface properties of BSA/DPPC mixture are similar to those of BSA alone. However, when the surface film mainly consists of DPPC, CQDs can obviously change the interfacial properties of DPPC monolayer.
研究领域:
生物物理学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
Materials Today Nano
·
2022
·
IF 13.364
K. Wang,L. Liu,Y. Liu,J. Luo
Macroscale superlubricity is a new field that can greatly reduce energy consumption due to friction, which accounts for approximately 30% of human nonrenewable energy. However, prior research on liquid superlubricity mostly involved low contact pressures (<600 MPa). Here, we evaluated the lubrication and adsorption properties of ionic liquid alcohol solutions (ILs (as) ) with different alkyl chain lengths and monovalent anions between Si 3 N 4 and sapphire surfaces. Robust macroscale superlubricity and ultrahigh load capacity exceeding 1 GPa were obtained by protective adsorption layer caused by tribochemical reactions. Zeta potential measurements and simulation analysis revealed that the ceramic interfaces were enriched with numerous ionic liquid (IL) anions, preventing the direct collision of the asperities of the friction pairs. The relatively low sliding energy barrier and extremely strong electrostatic repulsion developed between these asperities enhanced the superlubricity and ultrahigh load capacity. Meanwhile, long alkyl chains and tetrafluoroborate anions more easily met the hydrodynamic boundary conditions at the solid–liquid interface, and the formation of low energy consumption channels through the smooth potential energy fluctuation surface generated extremely low shear stress. Such macroscale lubrication provides a novel method of achieving extremely high contact pressure in ILs (as) , which could enable liquid superlubricity in practical industrial applications.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2024
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IF 6.1
Nanyi Lin,Zhengfeng Ma,Mingying Wang,Lixin Wang,Lihui Zhang,Hui Tang,Rui Wang,Feng Zhou,Weimin Liu
Water-based lubricants were limited on chemically inert and hydrophobic interfaces due to the difficulty in forming an effective boundary lubrication layer. In this study, a bottle-brush polyurethane (BBP) lubricant additive was designed to address the issue through the establishment of multiple non-covalent interactions. 1 H NMR, FTIR and molecular dynamics (MD) simulation revealed that the backbone and side chains of BBP provided multiple hydrogen bond interactions. QCM-D verified that BBP was capable of constructing a denser interfacial adsorption layer than linear macromolecules. The as-prepared BBP lubricant exhibited outstanding lubrication performance across various hydrophobic interfaces and was better than oleophilic, hydrophilic and amphiphilic lubricants. Meanwhile, BBP lubricant presented extremely low toxicity to cells and earthworms, indicating potential in medical and industrial fields.
研究领域:
材料科学
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生物学
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化学工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 39
·26555-26567
·
IF 10.7
Jie Gu,Xinwei Sun,Lulu Jiang,Zihan Zhang,Truls Norby,Donglin Han
We herein report a first experimental account of surface protonic conductivity in chemisorbed and physisorbed water layers in porous perovskite alkaline earth zirconates AZrO3, measured by impedance spectroscopy in wet atmospheres. We have studied the effects of temperature, pH2O, H/D isotope exchange, A-site cation (A = Ca, Zr, Ba), sintering temperature, and cation non-stoichiometry, and supported conclusions by thermogravimetry (TG) and X-ray photoelectron spectroscopy (XPS) and infrared (IR) spectroscopy. The proton conduction in the chemisorbed layer dominates above 200 °C and exhibits small pH2O-dependences and large pre-exponentials, activation energies (90 ± 10 kJ mol−1), and H/D isotope effects, all consistent with protonic conduction by dissociated protons in a well-covering layer of mainly molecularly chemisorbed water. Differences between CaZrO3, SrZrO3, and BaZrO3 supported by XPS results suggest that the higher acidity of smaller A-site cations and under-coordinated cations in the surface increase the proton conductivity. Below 200 °C, protonic conduction in the 1st solid-like physisorbed water layer exhibits positive pH2O-dependences and strongly negative activation energies hence dominated by adsorption in a far-from-complete physisorbed layer. A vanishing isotope effect suggests that migration is not by free protons in the physisorbed layer, but a vehicular species such as hydroxide ions. At the highest relative humidities near room temperature, a sharp increase in conductivity is indicative of increasing mobilities as the thicker water layer goes liquid over a hydrophilic surface. If these results are transferrable to electron conducting perovskites used as positrode materials for proton ceramic fuel cells at, e.g., 600 °C, they suggest that the strong chemisorption of water may block oxygen adsorption, while the high activation energy limits and gives a strong temperature dependency to surface diffusion of protons.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Jinze Lyu,Junxian Gao,Min Zhang,Qiang Fu,Luna Sun,Shuang Hu,Junbo Zhong,Shuo Wang,Ji Li
The separation and injection of photogenerated charge carriers significantly affect the mineralization efficiency of volatile organic compounds (VOCs). These two processes can be optimized by enhancing the separation of charge carriers and the adsorption of VOCs via material engineering. However, obtaining both high adsorption ability and photoactivity of VOCs simultaneously at the ppm level is difficult. In this work, we grew microporous TiO 2 onto the surface of anatase TiO 2 to construct a homojunction-adsorption layer, enhancing both the adsorption and photodegradation of low concentration of toluene, which was chosen as model VOC. N 2 adsorption/desorption, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy (XPS), GC-flame ionization detection, and surface photovoltage spectroscopy (SPS) were employed to analyze the physical properties and mineralization of toluene. Results showed that growth of microporous TiO 2 increased the surface area of the catalyst by 160% compared with anatase TiO 2 , as well as induced microporous structure. This phenomenon significantly enhanced the adsorption of toluene at a low concentration of 5.5 mg/m 3 and limited the release of the adsorbed organic compounds. Moreover, SPS and XPS results proved that a homojunction was constructed at the interface of microporous TiO 2 and anatase TiO 2 , greatly improving the separation of photogenerated charge carriers. Owing to the enhanced adsorption ability and photoactivity, the mineralization efficiency of toluene over micropore-anatase TiO 2 composite was 1.78 and 2.12 times higher than that over M-TiO 2 and anatase TiO 2 , respectively.
研究领域:
材料科学
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环境催化
·
光催化
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纳米材料
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大气污染控制
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 44
·24900-24905
·
IF 2.936
Yanjie Wang,Chun Fang,Ying Huang,Qing Liu,Ruirui Zhao,Xuli Ding,Yunhui Huang
Organic compounds have been utilized in rechargeable batteries as electrode materials on account of their designable structures and reversible redox properties. However, most of them suffer from problems with dissolution resulting in poor electrochemical performance. In this work, we adapt a sodium salt of tetracyanoquinodimethane (NaTCNQ) to work as a high redox potential cathode material in sodium ion batteries (SIBs). A porous carbon coated separator is demonstrated to be an adsorption layer and prevents the dissolved active material from migrating to the anode side. The NaTCNQ cell assembled with a carbon layer containing 5% activated carbon (AC) exhibits a higher initial capacity and greatly improved cycling stability. Using a conductive adsorption layer in organic redox batteries is a promising pathway to develop high performance organic electrode materials for SIBs.
研究领域:
电化学
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能源材料
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纳米材料
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电池技术
·
功能材料
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2025
·
IF 4.6
Yongkang Guo,Yanchao Ge,Shenao Nie,Yuxuan Qiu,Xin Wang,Yangang He
Polysilicon (Poly-Si) is crucial for gate electrodes and interconnects in integrated circuits. Surface uniformity after Chemical Mechanical Polishing (CMP) critically impacts device performance, especially with stringent photolithography requirements at scaled dimensions. Optimizing slurry formulation enhances uniformity, but the synergy between polymer (e.g., Polyvinyl Alcohol, PVA) and nonionic surfactant (e.g., Fatty Methyl Ester Ethoxylates, FMEE) and its effect on Poly-Si CMP uniformity remain unclear. This study introduced PVA and FMEE into an alkaline slurry. Post-CMP uniformity (Site Front Quotient Range, SFQR; Within-wafer Nonuniformity, WIWNU) and roughness (Local Root Mean Square Roughness, Sq) were evaluated using wafer geometry testing and Atomic Force Microscopy (AFM). Adsorption behavior and polishing effects were investigated via X-ray Photoelectron Spectroscopy (XPS), Attenuated Total Reflection Fourier Transform Infrared spectroscopy (ATR-FTIR), Molecular Dynamics (MD) simulation, and friction testing. Compared to control (Blank), PVA/FMEE slurry significantly improved uniformity: SFQR reduced by 0.05 μm, edge WIWNU decreased to 2.97 %, and Sq optimized to 0.55 nm. PVA and FMEE synergistically form a dense composite adsorption layer via hydrogen bonding, selectively modulating local removal rates through lubrication and interfacial protection. Synergizing with enhanced abrasive dispersion stability, this mechanism improves Poly-Si CMP surface uniformity. The findings provide insights for developing high-precision Poly-Si CMP slurries.
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2025
·
IF 5
Ting Xiao,Wenjie Zou,Congzhong Tian,Wentao Hu,Zhijun Zhang,Chengyan Xu,Fang Zhou
Green and efficient flocculants are crucial for the effective treatment and recycling of mine wastewater. Herein, the flocculation performance and mechanism of a novel amphoteric chitosan-based flocculant CMC-g-CPAM on kaolinite suspensions were investigated through settling tests, zeta potential measurements, floc size distribution, quartz crystal microbalance with dissipation (QCM-D) and atomic force microscopy (AFM) measurements. Settling tests results revealed that CMC-g-CPAM displayed exceptional flocculation performance, achieving a settling rate of 18.21 m/h for kaolinite at natural pH, higher than that of chitosan-grafted-cationic acrylamide Chi-g-CPAM (11.19 m/h). The in-situ adsorption layer of CMC-g-CPAM on silica and alumina surfaces was more rigid than that of Chi-g-CPAM. Subsequently, more kaolinite particles were flocculated by CMC-g-CPAM, and formed a denser floc layer. The adsorption amounts of CMC-g-CPAM and Chi-g-CPAM on silica surfaces were found to be greater than those observed on alumina surfaces at natural pH. This phenomenon was related to the different surface charges of silica and alumina, electrostatic interactions between the polymers and surfaces. From AFM measurements, an attraction between the CMC-g-CPAM functionalized probe and the functional substrate as they approached each other and a weak adhesion force among CMC-g-CPAM (0.31 nN over 50 nm) were observed. These indicated the presence of intermolecular interactions among CMC-g-CPAM, which contributed to the formation of compact flocs. In contrast, an obvious repulsion was detected when the Chi-g-CPAM functionalized probe approached the functional substrate, inhibited the entanglement of polymer chains. Meanwhile, the interactions between multiple molecules and the substrate displayed a large adhesion force (2.10 nN over 150 nm), attributed to the less rigid adsorption layer of Chi-g-CPAM. Our findings would provide new insights into the design of flocculants and effective wastewater treatment.
研究领域:
环境工程
·
高分子科学
·
胶体与界面科学
·
矿物加工
·
废水处理
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产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Xitong Liu,Fengzhang Wang,Jirong Wang,Ting Liu,Chengying Zhao,Jinkai Zheng
Pectin and flavonoids are important components of citrus fruits, but the effects of flavonoid grafting on the emulsifying properties of citrus pectin remain unclear. In this study, a novel natural citrus flavonoid-pectin conjugate in citrus peel was identified through alkaline hydrolysis combined with ultra-high performance liquid chromatography. Subsequently, two major citrus flavonoids were enzymatically conjugated to citrus pectin at high grafting rates (hesperidin: 20.21%; naringin dihydrochalcone: 16.11%). The flavonoids increased pectin amphipathy while ensuring a tighter conformation and denser network structure. These structural changes reduced the interfacial tension (from 20.6 to 18.4 mN/m) and increased the adsorbed layer thickness (from 11.8 to 37.8 nm), facilitating rapid pectin anchoring at the oil-water interface. These led to smaller droplet size and better emulsion stability. Prepared flavonoid-pectin conjugates with high grafting rates exhibited better emulsifying properties than those with medium grafting rates; hesperidin-pectin conjugates were more effective than naringin dihydrochalcone-pectin conjugates. The prepared flavonoid-pectin conjugates aid in the structural identification of natural flavonoid-pectin conjugates; they also facilitate analyses of the properties of these conjugates and offer new insights into improving the functional properties of pectins used in the food industry.
研究领域:
食品科学
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化学
·
生物技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Hengtong Zhang,Cailin Liu,Xianyan Ren,Haijun Yang,Shudong Lin
The existed polycarboxylic ether superplasticizer (PCEs) that mainly synthesized in a homogeneous catalytic synthesis has the disadvantages of low conversion rate and poor performance stability. In this paper, high performance PCE-1–5 were synthesized via a heterogeneous H 2 O 2 -ASA (ascorbic acid) redox system catalyzed with MnO 2 , Fe 2 O 3 , Co 2 O 3 , Ni 2 O 3 and ZnO respectively. GPC data show that the molecular weights of PCE-1–5 are higher than that of PCE0 (synthesized via a H 2 O 2 -ASA redox system without transition metal oxides). HPLC indicates that the conversion rates of macromonomer for PCE-1–5 are up to 99.81%, which is 27.47% higher than that of PCE0 (72.34%). As results, PCE-1–5 have a good dispersibility, high water reducing rate and are much benefits to the early hydration of cement paste and the strength of concrete. The mechanism research shows that the cement samples doped with PCE-1–5 have a larger zeta potential , stronger complexing ability with Ca 2+ , and thicker adsorption layer that is as high as 1.03 nm, which makes the spread diameter of cement paste as high as 309 mm. In addition, the obtained microstructure is much denser as is reflected by the nanometer pore size of hardened cement paste (12.26 nm), which makes the 28 d compressive strength of cement test block as high as 60.19 MPa. Generally, the heterogeneous transition metal oxide catalytic redox system provides a good choice for the synthesis of PCEs.
研究领域:
材料科学
·
化学工程
·
水泥与混凝土技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Haiyun Tang,Shujuan Yang,Jie Chang,Xinyu Zhao,Junhao Huang,Gaobo Yu,Yuhong Feng,Xueqing Zhou,Jiacheng Li
Incorporating antioxidants into the soft colloidal emulsifiers has been necessarily required to prepare antioxidant Pickering emulsions . Establishing interfacial properties-physical and chemical properties relationships has not been deeply explored by a comprehensive multiscale approach. Herein, the polysaccharide composite nanoparticles acted as antioxidants interface-anchored reservoirs were designed via non-covalent interaction between hydroxypropyl chitosan (HPCS), sodium alginate (Alg) and purple corn bracts anthocyanins (PCBA) at the molecular level. The orderly packing HPCS-Alg/PCBA composite nanoparticles formed the more highly-dense adsorption layers at oil/water interfaces at the microscopic level. With increasing the PCBA concentration, the bridged network particle aggregates between neighboring droplets resulted in a smaller size at the mesoscopic level and higher bulk stability at the macroscopic level. Interestingly, the bridged structures formed stronger antioxidant shells around dispersed droplets, further improving oxidative stability. These results highlighted the characteristics of the interfacial layers (thickness, strength , and viscoelasticity) that could be engineered to regulate the oxidation stability of Pickering emulsions at different scales. Therefore, this work proposed a novel strategy to protect lipid droplets of emulsions via manipulating the antioxidative soft colloidal particle's interfacial properties in the Pickering emulsions system, further extending the applications of antioxidant Pickering emulsions in food colloidal fields.
研究领域:
胶体科学
·
食品化学
·
材料科学
·
物理化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）