•Hybrid CFRP-SLA resin successfully manufactured and tested.•The strength significantly increase 3 times higher (91.35 MPa).•The flexural strength can increase 4.7 higher.•Interlocking mechanism ...proven as the strengthen model.•Delay catastrophic failure mechanism are reported.
Enhanced mechanical properties on the hybrid laminates consist of carbon fiber reinforced polymers-stereolithography (CFRP-SLA) reported in the present study. Hybrid laminates can significantly increase tensile strength more than 4,2 times higher (91.35 MPa), and flexural strength 10.7 times higher (156.81 MPa) compared to bare 3D printed samples. The improvement can be achieved due to the modification of the surface of the 3D printed model which has empty cavities filled with resin to form an interlocking mechanism and improved adhesion between laminates. The model can delay catastrophic failure mechanisms. The study could potentially be applied in structural and aerospace fields.
The Janus nanoparticles stabilized Pickering emulsions showed great application potential in various fields, including enhanced oil recovery (EOR). In this study, the amphiphilic Janus-SiO2 ...nanoparticles (Janus-C12) are successfully synthesized by the Pickering emulsion method and characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), ζ-potential and contact angle measurements. The phase inversion from oil-in-water (O/W), multiple oil-in-water-oil (O/W/O) emulsion, to water-in-oil (W/O) emulsions was observed with the delicate control for the modification degrees of Janus-C12. The possible emulsification mechanisms for various Janus-C12 stabilized emulsions were proposed. The multiple O/W/O emulsion stability in harsh conditions and the influence factors (nanoparticles concentration, water/oil volume ratio and NaCl concentration) were studied systematically. Moreover, the Janus-C12–79% stabilized multiple O/W/O Pickering emulsions exhibited excellent EOR performance (additional oil recovery of 27.2%) in core flooding tests, and the possible EOR mechanism was explored via microscopic visualization experiments.
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•Several amphiphilic Janus SiO2 nanoparticles (Janus-C12) were synthesized.•The hydrophile-lipophile balance of Janus-C12 was accurately controlled.•The individual Janus-C12-79% could generate multiple O/W/O Pickering emulsions.•The O/W/O Pickering emulsions showed high displacement and great sweep efficiency.•Remarkable EOR performance was achieved by the O/W/O Pickering emulsion flooding.
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•Surfactants play a crucial role in the synthesis of metal nanoparticles.•The effect of surface modifiers using three different surfactants is studied.•The photocatalytic activity of ...polymeric nanocomposites (PVA-CuO) was tested.•Characterization of the composites revealed that the efficiency is affected by the size.
Despite significant progress in the synthesis of metal nanoparticles, repeatability is a major bottleneck. The difficulty can be attributed to the synthetic methods, precursor materials, and surfactants used for surface modification. To provide a better understanding of the role of surfactants in materials synthesis, properties, and applications, this work reports the effect of surface modifiers using three different surfactants: cationic (cetyl trimethyl ammonium bromide, CTAB), anionic (sodium lauryl sulfate, SLS), and non-ionic (Tween 80, T80). The effect of these surfactants on the catalytic properties and the degradation efficiency of the polymeric matrix (CuO/PVA) has been investigated using 1,3,7-Trimethylpurine-2,6-dione (caffeine) as a major pollutant. From the kinetics studies, R2 = 0.9939 for Freundlich isotherm and 0.9839 for pseudo-first-order kinetics indicate that the reaction in the dark follows the Freundlich isotherm, whereas the adsorption of the pollutant on the catalyst surface follows pseudo-first-order kinetics. In addition, the surface modification has a greater impact on the degradation of caffeine as evident from the 29% higher degradation ability of the CTAB-assisted polymeric CuO compared to its unmodified counterpart. Surface characterization of the obtained polymeric matrix revealed that the degradation is also affected by the smaller particle size, band gap, and morphology of the catalyst. The scavenging experiments suggest significant involvement of the singlet oxygen in the degradation of caffeine by reducing the degradation to 49.8% from 96.5% after the addition of the scavenger. Herein, a simplified view of the variable catalytic affinity brought about by the surface modifications of the photocatalyst with respect to the surfactant employed during the synthesis has been presented.
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•Facile preparation of N-doped AC with high N-content was reported.•N-doped AC and AC were compared in terms of physical properties, CO2 adsorption.•Correlations between CO2 uptake ...and specific pore size section, N-content was analyzed.•N-doped AC exhibited better CO2 adsorption capacity and selectivity than AC.
Activated carbons (AC) were prepared by carbonization and KOH activation using rice husk as feedstock. The effects of impregnation ratios and activation temperatures on the properties of AC were investigated. Under optimum conditions, BET surface area, total pore volume and micropore volume of AC are as high as 1495.52 m2/g, 0.786 cm3/g and 0.447 cm3/g, respectively. Surface modification with chitosan as nitrogen source was performed simultaneously during KOH activation process. XPS and FT-IR analyses show that N-species was successfully incorporate into AC. Compared with AC-5 (general AC), CAC-5 (modified AC) exhibits better CO2 adsorption performance, reaching 5.83 mmol/g at 273 K and 1 bar, which can be attributed to the formation of the CO2-philic active sites on AC surface by N-species. The linear correlations between CO2 uptake, micropore volume within specific size section and N-content was investigated. The isosteric heat of CO2 adsorption for CAC-5 (average 30.21 kJ/mol) is much higher than that of AC-5 (average 14.48 kJ/mol). The adsorption behavior of CAC-5 can be well described by Freundlich model. The high IAST selectivity factor for N-doped ACs indicates their excellent adsorption selectivity for CO2 over N2. Both physisorption and chemisorption are present in CO2 adsorption process of N-doped ACs.
Thermoplastic fibre metal laminates (FMLs) increasingly attract attention in manufacturing parts that must present high strength-to-weight and stiffness-to-weight ratios. In addition, their polymer ...matrix's recyclability meets sustainability needs that conventional thermosetting-based FMLs cannot encounter. Mechanical drilling is one of the most used manufacturing operations they are subjected to, but it can still be a source of damage in the drilled zone, which, in turn, can impair the part service performance. In particular, the interface conditions between the metal skins and composite core significantly determine the drilling performance. In this framework, the paper investigates how the metal sheet surface modification treatments and composite polymer matrix characteristics can affect the drilling operation performance. It has been proved that rough metal surfaces and a polymer matrix with enhanced thermal resistance are the best combinations to ensure the integrity and quality of drilled holes.
Surface modification of photocatalyst is an effective way to improve the photocatalytic performance and can accelerate the separation of photoactivated carriers. In this paper, Carbon quantum dots ...(CQDs)/BiOCl composites were prepared by a facile hydrothermal method, which further improves the catalytic performance of BiOCl. X-ray photoelectron spectroscopy (XPS) and cryogenic electron spin resonance (ESR) confirm the successful construction of CQDs/BiOCl. Surface photovoltage spectroscopy (SPS), scanning electron microscopy (SEM) and electrochemical characterization show that the presence of CQDs significantly affects the surface state of BiOCl, accelerates the separation of photoinduced carriers, and results in the enhancement of ·O2− in the reaction system. Higher level of ·O2− in the reaction system shows stronger photocatalytic activity. The photocatalytic activity of CQDs/BiOCl was studied by destruction of phenol, rhodamine B (RhB) and tetracycline (TC). The photo-destruction activity of BiOCl toward phenol, RhB and TC is significantly improved by surface modification of BiOCl by CQDs. Interestingly, when the content of CQDs is 15 mL, the degradation capacity of CQDs/BiOCl toward phenol, RhB and TC is 24 times, 4.26 times and 2.4 times of that of BiOCl, respectively. Combined with the observation results, the photocatalytic enhancement mechanism of CQDs/BiOCl was elaborated.
The structural orientation of an amphiphilic crystalline polymer to a highly ordered microphase-separated lamellar structure on a hydrophobic surface is presented. It is formed by the surface graft ...polymerization of poly(ethylene glycol)behenyl ether methacrylate onto poly(trimethylsilyl) propyne in the presence of allylamine. In particular, allylamine plays a pivotal role in controlling the crystalline phase, configuration, and permeation properties. The resulting materials are effectively used to improve the CO
capture property of membranes. Upon the optimization of the reaction conditions, a high CO
permeability of 501 Barrer and a CO
/N
ideal selectivity of 77.2 are obtained, which exceed the Robeson upper bound limit. It is inspiring to surpass the upper bound limit via a simple surface modification method.
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•Dual-functional coating was prepared via a one-step mussel-inspired chemistry.•This non-leachable coating effectively killed drug-resistant bacteria on contact.•Pre-osteoblast ...proliferation and hydroxyapatite formation on it were promoted.
Prevention of infection and promotion of osteoconduction are the key factors to achieve long-term success in orthopaedic implants. In this work, an effective antimicrobial and osteoconductive coating is facilely prepared by the cross-linking of ε-poly-L-lysine (EPL) and catechol (abbreviated as EPLC) via a one-step mussel-inspired chemistry. A series of EPLC paints were prepared by catechol (15 mM) and varying concentrations of EPL (30, 40, and 50 mM) and named as EPLC1, EPLC2, and EPLC3. The coatings were easy to paint on implants. EPLC3 with the highest EPL concentration exhibited the most potent antimicrobial activity (greater than 99.99%) against both Gram-negative bacteria Escherichia coli (E. coli) and Gram-positive “superbug” methicillin-resistant Staphylococcus aureus (MRSA), and inhibited the biofilm formation of MRSA up to one week. Furthermore, the EPLC3 painted Ti implant was capable of reducing more than 3-log bacterial burden in a rodent subcutaneous infection model infected by MRSA. More interestingly, EPLC3 coating increased the osteoconductivity of Ti surfaces by promoting mouse pre-osteoblast MC3T3-E1 adhesion and proliferation. And the EPLC3 painted Ti surfaces could induce hydroxyapatite (HAp) formation after incubation in simulating human body fluids (SBF) within two weeks. Overall, the mussel-inspired EPLC paint can be easily applied to orthopaedic implants, and endowed Ti with antimicrobial activity and promoted its osteoconductivity, which will benefit the long-term success of Ti implants.
Coating methodology is commonly employed in the enhancement of Ni-rich cathodes for Li-ion batteries as an efficient approach, while its strategy and effect are still great challenges to achieve ...success in surface modifications for comprehensive electrochemical properties. In this work, the surface of Ni-rich cathode LiNi
Co
Al
O
(NCA) is modified by intimately coating NASICON-type solid electrolyte LiZr
(PO
)
(LZP) via a facile approach involving electrostatic attraction. With well-designed architecture and a uniform NASICON-type LZP nanolayer wrapping over the NCA microsphere, the entire electrode demonstrates exceptional Li
diffusion and conductivity and suppresses the side reaction between electrolyte and electroactive NCA, stabilizing the phase interface with less Li
/Ni
cation mixing. As a result, the NCA@LZP can deliver a high reversible capacity of 182 mAh g
at 1C in 2.7-4.3 V, maintaining the capacity retention of 84.6% after 100 cycles. More importantly, the structure stability of NCA is enhanced substantially by surface modification of LZP at high cutoff voltage. It achieves a reversible capacity of 204 mAh g
and keeps 100.4 mAh g
after 500 cycles at 1C in the potential range of 2.7-4.5 V. This effective strategy of using NASICON fast ionic conductor like LZP as a coating layer may provide a new insight to modify the surface of Ni-rich electrode, improving the rate capability and cyclic performance under high voltage.
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