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•The introduction of microarc oxidation layer enhances the adhesion strength of superhydrophobic layer by mechanical interlocking effect.•The coating possesses superhydrophobicity ...toward different temperature and pH water droplets, even in UV radiation environment.•The anticorrosion property is drastically improved by the outstanding barrier effect of microarc oxidation layer and superhydrophobic layer.•The as-prepared dual-layer coating with excellent properties paves the way for application of Mg alloys in practice.
Endowing Mg alloy surface with superhydrophobicity solves its poor corrosion resistance for broadening the wide application fields. However, the superhydrophobicity is vulnerable to failure under service environments due to the exfoliation and degradation of surface material. Hence, a bilayer composite coating composed of microarc oxidation layer and superhydrophobic layer was fabricated to protect Mg alloys by modulating superhydrophobic coating/substrate interface. The bilayer coating with a water contact angle of 158.3° possesses excellent water-repellent, and self-cleaning properties. In addition, the bilayer coating consistently remains superhydrophobicity in acid, alkaline, high/low temperature, and ultraviolet radiation environments, indicating the excellent environmental stability. Notedly, the lowest-frequency impedance value of bilayer coating (6.78 × 106 Ω·cm) increases five orders of magnitude compared with that of Mg alloy (60.2 Ω·cm), and the inhibition efficiency is calculated to be 99.99 %. The excellent corrosion resistance of coating is attributed to the synergistic barrier protection of microarc oxidation layer and superhydrophobic layer, implying that it provides effective protection for Mg alloy. Therefore, the as-prepared bilayer coating has great application prospects in corrosion protection of Mg alloys toward different service environments.
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•The review offers an overview of the sonochemical synthesis of nano-scale inorganics.•The recent progress of sonochemistry in catalysis fields is discribled in the review.•Reduction, ...oxidation, degradation, polymerization or other catalysis are emphasized.
Catalysis covers almost all the chemical reactions or processes aiming for many applications. Sonochemistry has emerged in designing and developing the synthesis of nano-structured materials, and the latest progress mainly focuses on the synthetic strategies, product properties as well as catalytic applications. This current review simply presents the sonochemical effects under ultrasound irradiation, roughly describes the ultrasound-synthesized inorganic nano-materials, and highlights the sonochemistry applications in the inorganics-based catalysis processes including reduction, oxidation, degradation, polymerization, etc. Or all in all, the review hopes to provide an integrated understanding of sonochemistry, emphasize the great significance of ultrasound-assisted synthesis in structured materials as a unique strategy, and broaden the updated applications of ultrasound irradiation in the catalysis fields.
The recyclable strategy for fabricating curcumin-loaded microcapsules can increase the drug loading rate and reduce costs.
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•Economical and efficient preparation of carboxymethyl ...cellulose-based microcapsules by sonochemical method.•The prepared microcapsules have high encapsulation rate, good stability and biocompatibility.•The excess curcumin and ethyl acetate produced during the preparation of microcapsules can be recycled and reused.•The CMC-based microcapsules have broad clinical prospects in chemotherapy drugs delivery.
In the present study, an eco-friendly, biodegradable, biocompatible, non-immunogenic, non-toxic polysaccharide, carboxymethyl cellulose (CMC), derivatived from renewable biomass cellulose, was used for designing and fabrication a folic acid modified pH and reduction dual-responsive carboxymethyl cellulose-based microcapsules (FA-PRCMCs). The curcumin (CUR)-loaded microcapsules (FA-PRCMCs@CUR) were prepared via a quick, efficient and environment-friendly sonochemical method, and were employed for the targeted delivery and pH/reduction dual-stimuli-responsive release of CUR. The excess CUR and ethyl acetate phases could be recycled and reused after preparation of FA-PRCMCs@CUR to avoid wasting resources and polluting the environment. The obtained FA-PRCMCs showed good biocompatibility and targeting in anti-tumor evaluation and endocytosis evaluation in vitro. FA-PRCMCs could effectively reduce the unnecessary damage to normal cells by chemotherapy drugs, and improve the utilization of chemotherapy drugs to reduce therapy costs. FA-PRCMCs could be used as smart targeted delivery vectors and have great clinical application potential.
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•The raw material of carbon quantum dots is waste biomass.•Near-critical water liquidation technology is non-toxic and pollution-free.•The method to prepare the carbon quantum has the ...great potential for mass production.•The carbon quantum dots we prepared have the excellent optical properties.
Carbon quantum dots (CQDs) have diverse outstanding properties and potential application, but there are not many reports on the preparation of CQDs from agricultural waste without any addition of chemical reagent. Herein, a facile, economical and environmental route was developed for green synthesis of CQDs from corn stalk shell by hydrothermal approach in near-critical water. It’s worth noting that this method converted the biomass, which is regarded as agricultural wastes, into the carbon nano-materials with brilliant potential. The prepared CQDs present the great fluorescence property, the remarkable stability and biocompatibility, demonstrating this method is appreciate to produce the CQDs. The as-prepared CQDs can be employed in detecting and bioimaging domain, displaying distinctive potential for application. The superiorities of low-cost, renewability and sustainability drive the synthesis and applications of CQDs derived from biomass.
Ultrasound-assisted approaches, as an important trend in material synthesis, have emerged for designing and creating nano-/micro-structures. This review simply presents the basic principles of ...ultrasound irradiation including acoustic cavitation, sonochemical effects, physical and/or mechanical effects, and on the basis of the latest progress, it newly summarizes sonochemical catalysis for the fabrication of nano-structured or micro-structured inorganic materials such as metals, alloys, metal compounds, non-metal materials, and inorganic composites, where the theories or mechanisms of catalytic synthetic routes, and the morphologies, structures, sizes, properties and applications of products are described in detail. In the review, a few technological potentials and probable challenges of sonochemical catalysis are also highlighted for the future advance of synthesis methods. Therefore, sonochemical catalysis or ultrasound-assisted synthesis will serve as a unique strategy to reveal its great significance in material fabrication.
Sonochemical catalysis serving as a facile and short-time strategy is widely used in the fabrication of nano-/micro-structured inorganics
via
ultrasound-assisted approaches.
In this paper, we present a novel method for the preparation of raspberry-like monodisperse magnetic hollow hybrid nanospheres with γ-Fe₂O₃@SiO₂ particles as the outer shell. PS@Fe₃O₄@SiO₂ composite ...nanoparticles were successfully prepared on the principle of the electrostatic interaction between negatively charged silica and positively charged polystyrene, and then raspberry-like magnetic hollow hybrid nanospheres with large cavities were achieved by means of calcinations, simultaneously, the magnetite (Fe₃O₄) was transformed into maghemite (γ-Fe₂O₃). Transmission electron microscopy (TEM) demonstrated that the obtained magnetic hollow silica nanospheres with the perfect spherical profile were well monodisperse and uniform with the mean size of 253nm. The Fourier transform infrared (FTIR) spectrometry, energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD) provided the sufficient evidences for the presence of Fe₃O₄ in the silica shell. Moreover, the magnetic hollow silica nanospheres possessed a characteristic of superparamagnetic with saturation magnetization value of about 7.84emu/g by the magnetization curve measurement. In addition, the nitrogen adsorption–desorption measurement exhibited that the pore size, BET surface area, pore volume of magnetic hollow silica nanospheres were 3.5–5.5nm, 307m²g⁻¹ and 1.33cm³g⁻¹, respectively. Therefore, the magnetic hollow nanospheres possess a promising future in controlled drug delivery and targeted drug applications.
A novel and effective strategy was first proposed for the codeposition of a mussel-inspired nanohybrid coating with excellent wettability onto the surface of carbon fibers (CFs) by simultaneous ...polymerization of bioinspired dopamine (DA) and hydrolysis of commercial tetraethoxysilane (TEOS) in an eco-friendly one-pot process. Mussel-inspired nanohybrids could be adhered onto the surface of CFs firmly. The novel modification could afford sufficient polar groups and significantly improve fiber surface roughness and energy without decreasing fiber intrinsic strength, which were advantageous to promote interfacial compatibility and wettability between CFs and matrix resin. As a result, the interfacial shear strength of composites increased to 48.21 ± 1.45 MPa compared to that of untreated composites 29.47 ± 0.88 MPa. Meanwhile, the nanohybrid coating increased significantly composites' hydrothermal aging resistance. The efficient strategy shows a promising and green platform of surface functionalization of CFs for preparing advanced polymer composites arising from broadly mechanical-demanding and energy-saving usages.
Objective:
To evaluate the neuroprotective effect of resveratrol (RES) in rat models of cerebral ischemia/reperfusion (I/R) injury.
Data sources:
PubMed, Embase, MEDLINE, Cochrane Library, and ...Chinese databases were searched from their inception dates to July 2022. No language restriction was used in the literature search.
Date Selection:
Studies were selected that RES were used to treat cerebral I/R injury
in vivo
. Two reviewers conducted literature screening, data extraction and methodological quality assessment independently.
Outcome measures:
Cerebral infarct volume was included as primary outcome. The secondary outcomes included cerebral water content and neurological deficit scores. Malondialdehyde (MDA) and superoxide dismutase (SOD) were used to evaluate oxidative stress during medication.
Results:
A total of 41 studies were included, and only a few of them the methodological quality was relatively low. Compared with the control group, RES significantly reduced the cerebral infarct volume (29 studies, standard mean difference (SMD) = −2.88 −3.23 to −2.53,
p <
0.00001) and brain water content (nine studies, MD = −9.49 −13.58 to −5.40,
p <
0.00001) after cerebral I/R injury, then neurological function was improved (15 studies, SMD = −1.96 −2.26 to −1.65,
p <
0.00001). The MDA level (six studies, SMD = −8.97 −13.60 to −4.34,
p
= 0.0001) was decreased notably after treatment of RES, while the SOD level (five studies, SMD = 3.13 −0.16 to 6.43,
p
= 0.06) was increased unsatisfactory. Consistently, subgroup analysis of cerebral infarct volume suggested that the optimal therapeutic dose is 30 mg/kg (eight studies, SMD = −5.83 −7.63 to −4.04,
p
< 0.00001). Meanwhile, 60 min of occlusion (three studies, SMD = −10.89 −16.35 to −5.42,
p <
0.0001) could get maximum benefit from compared with 90 min and 120 min of occlusion. On the other hand, the publication bias cannot be ignored. The pharmacological mechanisms of RES on cerebral I/R injury models as reported have be summarized, which can be used for reference by researchers to further plan their future experiments.
Conclusion:
RES might have a good neuroprotective effect on cerebral I/R injury in rats, then 30 mg/kg RES may be the optimal dose for treatment, and early administration of RES should be more neuroprotective. Also it need to be further verified through exploration of dose effect relationship, or delay administration or not.
Black oxide coatings on 6061 Al alloy were produced by plasma electrolytic oxidation (PEO) process in silicate- and phosphate-rich base electrolytes with addition of ammonium metavanadate (NH4VO3), ...respectively. The characteristics of PEO processes and resulting coatings were investigated. The thermal control properties of the coatings were measured. The corrosion protection performances of the coatings in an acidic environment were evaluated. Results show that the base electrolytes have significant influence on the PEO discharge behavior, coating characteristics and properties. There are more intensive discharges in silicate-rich electrolyte with addition of NH4VO3 (denoted as “Si–V″) than that in phosphate-rich electrolyte with addition of NH4VO3 (denoted as “P–V”), leading to higher thickness and more defects for the Si–V coating. Both Si–V and P–V coatings are characterized by black color in appearance due to the formation of V-containing compounds. However, the P–V coating has higher contents of V-containing compounds and therefore lower lightness and higher solar absorptance (αs) than the Si–V coating. In addition, the P–V coating exhibits better corrosion protection performance and color durability compared with the Si–V coating in acidic NaCl solution (pH = 3.1⁓3.3) due to the formation of AlPO4 in the coating. It is demonstrated that phosphate-rich base electrolyte with addition of NH4VO3 is a good candidate for getting stable black therm control coatings on Al alloy for practical applications in harsh environment.
The emulsifier-free core–shell polyacrylate latex nanoparticles containing fluorine and silicon in shell were successfully synthesized by emulsifier-free seeded emulsion polymerization with water as ...the reaction medium. The silicon-containing fluorinated polymer could be fixed on the surface of polyacrylate nanoparticles due to the formation of the crosslinked network structure. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) analysis indicated that the obtained emulsifier-free core–shell nanoparticles were uniform and possessed narrow size distributions. The core–shell structure and chemical components of the emulsifier-free core–shell nanoparticles were investigated by TEM and Fourier transform infrared (FTIR) spectrometry, respectively. X-ray photoelectron spectroscopy (XPS) analysis and contact angle measurement on the latex films proved the propensity of fluorine and silicon enrichment at film–air interface. In addition, the thermal stability of the latex films was improved with increasing the concentration of fluorine and silicon.
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