Coatings
·
2020
·Vol. 10
·期 9
·847
·
IF 2.436
Zede Yi,Bo Zhao,Murong Liao,Zhiyong Qin
Superhydrophobic treatment of wood surfaces can effectively prevent the contact between the external moisture and wood, which improves the service life of the wood. In this study, different rough surfaces of wood were constructed, derived from the self-polymerization of dopamine (DA) in weak base solution to form a polydopamine (PDA) coating and the deprotonation of the PDA coating in a strong base solution. Furthermore, octadecyltrichlorosilane (OTS) was used as a low-surface-free-energy agent to modify rough surface in order to prepare superhydrophobic woods: Wood@PDA–NaOH–OTS and the Wood@PDA–NaOH/SiO2–OTS. The contact angles (CAs) and sliding angles (SAs) of the resulting superhydrophobic woods were tested. The results showed that the CA and SA of the Wood@PDA–NaOH–OTS were 151° and 4.8°, respectively; the CA and SA of the Wood@PDA–NaOH/SiO2–OTS were 155.1° and 5.0°, respectively. Surface electron microscopy (SEM) images presented that NaOH successfully etched the PDA coating, and the roughness was further improved by adding nano-SiO2. Atomic force microscope images (AFM) revealed that the nano-SiO2particles could effectively provide nanolevel roughness, which was beneficial to the wood’s superhydrophobic properties. In addition, the obtained superhydrophobic wood possessed strong surface stability and anti-loss property, as well as resistance to acid-base solution and organic solvent.Keywords:polydopamine;alkaline etch;superhydrophobic wood;stability
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Likun Yang,Hua Yuan,Yongjie Shi,Shengping Wang,Xinbin Ma
An efficient alcohol adsorbent has been prepared by the NaOH etching of Na-FAU zeolite and applied for the deep removal of the alcohol from FT-mixed olefins. Due to the NaOH etching, the adsorption capacity of the NaX-2 adsorbent (85 mg/g) for n-butanol was significantly higher than the NaX adsorbent (42 mg/g). As demonstrated by SEM, 29 Si NMR, 27 Al-NMR, CO 2 -TPD, and N 2 adsorption–desorption, the etching of zeolite NaX occurs at the grain boundary, which leads to more mesopores, increased weak base sites, and Si(3Al) structure formation by alkali etching, facilitating alcohol diffusion and improving the adsorption through hydrogen bonding. In-situ FTIR and molecular simulations were employed to demonstrate the adsorption models of alcohols over Na-FAU zeolite. The hydrogen bonding network formed by dealumination finally enhances the alcohol adsorption by the hydrogen bonding by O al -H al ‧‧‧O zeo and O zeo -H zeo ‧‧‧O al . This work provides a facile preparation method for removing trace alcohol from olefins, giving promising guidance for industrial applications.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 1
·825-831
·
IF 3.086
Zhenhui Liu,Lianxi Chen,Xinshan Ye,Huogen Yu,Jie Li,Fanlong Zeng
Hollow mesoporous silica nanospheres with high-density functional groups were successfully prepared based on an effective basic selective etching strategy. In this work, thiol-functionalized hollow mesoporous silica nanospheres were synthesized by the etching of cyano-SiO2@thiol-SiO2 and vinyl-SiO2@thiol-SiO2 core–shell composite particles. The composite particles were fabricated, respectively, via a two-step sol–gel reaction of different organosilanes. The different alkali resistance between the inner core and the outer shell of the composite particles is the key to fabricating hollow silica nanospheres in this paper. When the core–shell composite particles were treated with Na2CO3 and NaOH, the thiol functionalized outer shell showed higher stability than the cyano and vinyl functionalized inner core. The inner core, which is less stable under alkaline conditions, will be etched off in base, resulting in a hollow structure. Transmission electron microscopy (TEM) results demonstrate that large-scale hollow mesoporous silica nanospheres can be obtained through this method. In addition, it is also found that the morphology of samples may be regularly changed by manipulating the concentration of alkali in the etching process. Fourier transform infrared (FT-IR) and energy dispersive spectrometry (EDS) confirm that the thiol groups exist in the organic functionalized hollow mesoporous silica nanospheres obtained. We expect that this facile strategy can be extended to fabricate organic functionalized hollow mesoporous silica nanospheres with more other valuable functional groups.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2020
·
IF 4.231
Baisong Zhao,Zi-Li Zheng,Wei Liu,Hua-Mo Yin,Ri-Tong Lan,Ling Xu,Jia-Zhuang Xu,Xingrong Song,Zhong-Ming Li
Nanotopographical and chemical cues were collectively introduced onto the poly(L-lactic acid) (PLLA) surface via alkali etching and polydopamine (PDA) coating. The surface pattern was made of dense-packed PLLA lamellae, and the PDA coating did not change the feature of surface topography . Both nanotopographical pattern and PDA coating showed long-term stability in cell culture medium for two weeks. In vitro evaluations displayed that there was a synergy between nanotopography and PDA coating on cell adhesion, proliferation, and differentiation of osteoblasts, even for a culture period of two weeks. This sustained effect was attributed to the activation of the wnt/β-catenin pathway. These results hold a promising prospect for the application of bone repair grafts.
研究领域:
生物材料
·
组织工程
·
细胞生物学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）