APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Liman Zhao,Rongrong Chen,Liangjie Lou,Xiaoyan Jing,Qi Liu,Jingyuan Liu,Jing Yu,Peili Liu,Jun Wang
Marine biofouling is an important obstacle to the development of marine resources. Problems such as huge economic losses caused by biofouling and environmental damage caused by toxic antifouling agents have not been resolved. Therefore, it is of great significance to develop a novel, environmentally friendly antifouling (AF) materials. However, in the marine environment, Laminaria japonica still has excellent antifouling ability in a relatively static state compared to those parade creatures. Inspired by this, this study reports a synergistic effect between surface topography and chemical modification to inhibit marine biofouling. Firstly, the surface of the Laminaria japonica was analyzed and its morphology was reproduced using a simple moulding process. Additionally, the polyelectrolyte layer composed of sodium alginate and (guanidine-hexamethylenediamine-PEI) (poly(GHPEI)) was chemically modified on the isotropic microstructure surface of PDMS replicas by layer-by-layer assembly method. The anti-adhesion ability of the biomimetic material was tested with Nitzschia closterium ( N. closterium ) (9 ± 5 diatoms mm −2 of N. closterium adhered). Meanwhile, the antifouling performance of the modified films were evaluated by Escherichia coli ( E. coli ), and its antibacterial ability were as high as 96.2 ± 1.3%. The combination of microtopography and (GHPEI/ALG) * n films endow the coating with excellent antifouling ability.
研究领域:
海洋生物学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Yujia Liu,Shuyan Zhang,Siqian Chen,Jie Zhu,Lin Li
Migration of additives is an important issue for proper application in food packaging. In this work, propionylated waxy and normal starch-based nanocomposites (PW-N and PN-N) with two different amylopectin content were immersed in distilled water, and structural changes and migration mechanism of plasticizer (triacetin) were discussed in detail. Results showed that when immersion time was prolonged to 150 h, small crystals of PN-N disappeared, and amorphous structures formed gradually in PW-N and PN-N. Exfoliated structures still remained in PW-N with prolonged immersion time, while exfoliated structures gradually formed from intercalated ones in PN-N, and the peak representing d001 ( d -spacing) at q = 1.70 nm −1 faded. The migration mechanism of triacetin obeyed the first-order kinetic model and Fick's law; furthermore, in comparison with PW-N, PN-N showed a larger diffusion coefficient ( D 2 = 12.13 μ m 2 ·h −1 ). These results contributed to expanding the application of starch-based nanocomposites in future environmentally friendly food packaging.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 39
·期 1
·151-158
·
IF 2.726
Wang Xiaonan,Wang Bohan,Lai Hua,Cheng Zhongjun
R ecently, surfaces with intelligent wetting controllability have aroused increased attention. Endowing the surface with stimuli-responsive surface chemistry and tunable surface microstructure can achieve a surface with smart wetting performances. However, almost all existing surfaces only focused on single surface chemistry or micromorphology, thus to achieve smart multiple wetting regulation is still difficult. Herein, we report a ZnO coated shape memory polymer(SMP) surface, and the surface chemistry and micromorphology can be synergistically regulated. ZnO can provide adjustable surface chemistry under UV irradiation, and SMP can offer tunable micromorphology due to its shape memory effect(SME). Based on the combined effect between the above two features, surface wetting performance can be smartly regulated among multiple states. Moreover, due to the excellent controllability of the surface, the application in directional droplet transportation was also demonstrated. This paper offers a new surface with tunability in both surface chemistry and micromorphology, and given the excellent wetting controllability, the surface is believed to be applied in a lot of fields, such as droplet manipulation, fluidic devices and selective catalysis.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 7
·5492-5498
·
IF 2.22
Xu Lei,Xu Yuan
Ba(Zr x Ti 1− x )O 3 ceramics ( x = 0.15, 0.2, 0.25, 0.3) were prepared with solid-state reaction method. The ratio of Zr/Ti influences the crystal structure, micromorphology, ferroelectric and dielectric properties of BZT ceramics, which were characterized, respectively, by X-ray diffraction, scanning electron microscope, ferroelectric test system and dielectric test system. The X-ray diffraction patterns show that the zirconium titanate ceramic samples adopt cubic phase structure and no secondary phase. As the Zr 4+ content increases, the lattice constant increases and the grain size decreases. BZT ceramic sample with 15% zirconium content has the highest dielectric constant. As the Zr 4+ content increases, the dielectric constant is gradually decreased, and Curie temperature dropped from 334 to 226 K. The sample has the largest remanent polarization, when the zirconium ion content is 15%. Subsequently, the remanent polarization is reduced as the zirconium ion content increases.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
铁电材料
·
介电材料
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2023
·
IF 5.8
Si Lin,Xiaoting Yuan,Xinrui Du,Ran An,Yingchao Han
In this study, polylactic acid (PLA) microspheres were used as the raw material to construct bulk implants with surface microtopography through hot pressing and heat treatment, and the microtopographical structures were regulated through the sizes of the PLA microspheres. The surface microtopographies of PLA implants were successfully constructed using micron-sized bulges, which showed a wave-like structure. The ridge width of bulges ranged from 1.64 ± 0.16 µm to 82.52 ± 14.38 µm and the valley depth ranged from 0.49 ± 0.07 µm to 37.35 ± 6.78 µm according to the sizes of microspheres. The nanoindentation tests showed that the modulus and hardness of PLA implants were gradually increased with the decrease in microsphere sizes. The surface microtopography resulted in a slight increase in the hydrophobicity of the PLA implants, but no significant differences were observed. Cells cultured on the implant surface with microtopography exhibited varying morphological responses, and significantly increased osteogenic activity was observed relative to a PLA flat film. This study demonstrated that the surface microtopography derived from PLA microspheres could regulate cellular response and activate osteogenic properties of PLA implants.
研究领域:
生物材料
·
组织工程
·
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR BIOSCIENCE
·
2018
·Vol. 18
·期 3
·1700312
·
IF 3.392
Tao Chen,Yuanhong Xu,Wenrong Yang,Aihua Li,Yao Wang,Jing Sun,Jingquan Liu
Concavo-convex micelles with controllable sizes and nanostructures are prepared via self-assembling polymer–enzyme (e.g., shellac enzyme) conjugates with heterogeneous polymer chains, which exhibit higher enzyme stability (300%) and bioactivity (760%) comparing with the well-defined ones. The applied amphiphilic and negatively charged copolymer, poly (methyl methacrylate)-block-poly (sodium p-styrene sulfonate), is synthesized via reversible addition–fragmentation chain transfer polymerization to modify shellac enzyme and immobilize the enzyme bioactivity inducer by covalent conjugation and electrostatic attraction, respectively. The degradation test of catechol confirms the application potential of as-prepared micelles as an efficient and economical decontaminant.
研究领域:
材料科学
·
生物技术
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）