Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Shang-Yuan Cheng,Chen-Peng Zhang,Meng-na Chao,Shu-Wei Guo,Gui-Sheng Qi
Suspended nanodroplets affect the transfer process within fluids through micro-perturbation or micro-convection effects. Therefore, adding dispersed nanodroplets as the dispersed phase into the liquid phase to form nanoemulsions can enhance the CO 2 absorption process. The quality of nanoemulsions mainly depends on the emulsification equipment. Traditional physical mechanical effects can only achieve large-scale macroscopic mixing, which usually takes a long time to complete, resulting in issues such as low production efficiency, batch operation, and long preparation cycles. This paper uses an impinging stream-rotating packed bed as a reactor, with span60 and tween60 as surfactants, and adopts a high-gravity process intensification technology to prepare undecane/methanol nanoemulsions with good dispersion stability. Nanoemulsion absorbents for CO 2 capture applications have been developed. The effects of different operating conditions on the dispersion stability of nanoemulsion were investigated. Furthermore, CO 2 absorption performance of nanoemulsion absorbents and methanol were investigated in a bubbling reactor. Based on the results, the reasonable mechanism for the enhancement of mass transfer was also discussed in detail. Further experiments on CO 2 absorption using nanofluids were conducted and compared with pure methanol. The results indicate that when the undecane volume fraction is 0.01 %, the high-gravity factor is 27, the impinging velocity is 14.1 m·s −1 , and the circulation time is 20 min, the nanoemulsion exhibits the highest stability, with the narrowest particle size distribution of oil droplets, an average particle size of 20.5 nm, and the highest uniformity. Simultaneously, the change in turbidity over time is minimal. The corresponding thermal conductivity at 25°C is 0.2003 W/m·K. The addition of nano-oil droplets significantly accelerates the CO 2 absorption rate, allowing the absorbent to reach saturation earlier, while the total amount of CO 2 absorbed remains the same. Compared with pure methanol, the nanoemulsion enhances the CO 2 absorption rate by 4.48 %. This work may provide a promising green method for efficient production of nanoemulsions for carbon dioxide capture.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·Vol. 142
·期 22
·e56947
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IF 2.8
Li Gao,Haihong Gu,Chao Ye,Chunxia Wang,Zimin Jin
A superhydrophilic polylactic acid (PLA) fiber membrane was fabricated by developing a hydrophilic silica surface layer on electrospun fibers. The drawn fibers were twisted and activated in an ethanol solution, leading to the shrinkage of the membrane and enhancing surface hydrophilicity, as well as reducing the pore size of the membrane. Through the coupling of 3-aminopropyltriethoxysilane, silica was polymerized in situ on the fiber surface of the electrospun PLA membrane to achieve a superhydrophilic surface. The membrane underwent degradation in a sodium hydroxide aqueous solution at a rate of 2.240 min −1 . The membrane was employed for separating surface-stabilized oil-in-water emulsions. The oil droplet sizes in the filtrates were 93, 169, and 132 nm, respectively. The water flux of the membrane for ionic oil-in-water emulsions reached 3205 L·m −2 ·h −1 , attributed to the electrostatic effect on the membrane surface (35.35 eV) and the sieving effect of the pore channel (0.918 μm). In contrast, the water flux for nonionic emulsions was only 350 L·m −2 ·h −1 . Furthermore, after immersing the membrane in the hydrolysis of tetraethyl orthosilicate again, the oil retention rate remained at 98.6%, and the water flux recovery rate was sustained at 96.3% over 30 cycles of separating oil-in-water emulsion.
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ACS Nano
·
2025
·
IF 16
Yike Gao,Xiaojing Yuan,Ruoheng Gu,Nan Wang,Huihui Ren,Rui Song,Zhuo Wan,Jianyong Huang,Kaikai Yi,Chunyang Xiong,Zuoying Yuan,Yuming Zhao
Biomaterials functionalized with small extracellular vesicles (sEVs) hold great regenerative potential, and their therapeutic efficacy hinges on the delivery kinetics of the sEVs. Achieving rapid and stable loading, along with precisely controlled release of sEVs, necessitates affinity modifications of biomaterials. Here, we provide a quantitative description of the interaction between sEVs and various affinity molecules (i.e., polydopamine (PDA), tannic acid (TA), heparin, polyethylenimine (PEI), and calcium phosphate (CaP)) through molecular dynamics simulation. The interaction strengths followed the order of PDA < heparin < TA < CaP < PEI. To tailor the delivery kinetics of stem cells from human exfoliated deciduous teeth (SHED)-derived sEVs with concentration-dependent bioactivities, we employed two representative affinity molecules, namely PDA and CaP, to modify PLGA porous microscaffolds (PLGA MS), resulting in PDA-modified PLGA MS (PDA@MS) and biomineralized PDA-modified PLGA MS (B/PDA@MS). The B/PDA@MS exhibited the highest loading efficiency (>20 μg/mg microscaffolds) and optimized the release profile of sEVs over 21 days. Upon injection into a 5 mm defect in the rat cranial bone, sEV-loaded B/PDA@MS demonstrated the highest level of bone regeneration, with the new bone volume fraction (BV/TV) and bone mineral density (BMD) reaching 64.0% and 604.5 mg/cm3 within 8 weeks, respectively. This work not only presents a biomineralized microscaffold with sustained sEVs release and high osteogenic potential but also offers guidance on the further design and translation of sEV-functionalized biomaterials with broader applications.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Linze Liu,Hangqi Ren,Yilan Wu,Hao Zhang,Xingyao Xie,Jiayu Shi,Shaobo Li,Tungalag Dong,Xueyan Yun
Nanostructured lipid carriers (NLC) have been widely used for the delivery of bioactive compounds. Sheep tail fat comprises both high- and low-melting-point lipids, making it a natural lipid matrix for producing NLC. Herein, NLC were prepared using sheep tail fat as the lipid matrix, and their physicochemical, crystallization, and digestive properties and quercetin (Qc) delivery efficiency were investigated. Results revealed that the particle size of NLC solidified at 4–25 °C ranged from 251 to 285 nm during 60 days. Tween 40 and 60 promoted heterophane nucleation in NLC, whereas Tween 20 and 80 promoted homogeneous nucleation. Heterophane nucleation may form fewer, larger internal crystals in the NLC, which may have disrupted the interfacial film and resulted in Qc leakage and decreased bioaccessibility. NLC stabilized with Tween 80 (T80-NLC) and solidified at 25 °C showed the maximum Qc encapsulation efficiency of 82.9 % and the maximum bioaccessibility of 42.8 %. However, when the solidification temperature was decreased to 4 °C, the bioaccessibility of T80-NLC reduced to 19.3 %, likely because the crystallization of NLC may disrupt their interfacial structure.
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LANGMUIR
·
2025
·
IF 3.9
Zhiyi Zang,Yongkang Wang,Wei Liu,Congcong Chao,Guanghui Cui,Shaojun Wu,Zhanpeng Wu
High internal phase emulsion (HIPE) technology offers a robust approach to fabricating porous polymers with precise morphological control. However, monomers with high water solubility, such as methyl methacrylate (MMA) and hydroxyethyl methacrylate (HEMA), present significant challenges in forming stable water-in-oil HIPEs with the help of conventional surfactants. In this work, a series of amphiphilic polyphosphazenes (PPZs) with hydrophobic fluorine-containing segments and hydrophilic segments were synthesized via nucleophilic substitution reactions between poly(dichlorophosphazene) and various nucleophilic reagents. These PPZs were used to stabilize MMA and MMA-HEMA HIPEs by forming an anchoring layer at the water–oil interface. The resulting HIPEs demonstrated remarkable stability over 24 h with only 1 wt % PPZs. Porous PMMA and copolymers P(MMA-HEMA) with a controllable pore size were successfully synthesized via free radical polymerization. The porous PMMA exhibited excellent hydrophobic–oleophilic properties, achieving a maximum water contact angle of 159.8°. The porous PMMA also shows strong absorption performance to various organic solvents, with a maximum absorption capacity to dichloromethane of 3.9 g/g. Conversely, the porous P(MMA-HEMA) showed hydrophilicity with minimum water contact angles of 23° and a maximum absorption capacity to water of 1.9 g/g. Moreover, the effects of the molecular structures and the dosage of PPZs and the concentration of HEMA in the formulation on the morphologies and properties of the HIPEs and the corresponding porous polymers were comprehensively investigated. These notable performances endow the prepared porous PMMA and its copolymer P(MMA-HEMA) with exceptional potential for advanced applications in the field of adsorption. The developed material demonstrates efficacy in environmental remediation and resource recovery, particularly for capturing halogenated solvents (e.g., dichloromethane) and oxygenated residuals (e.g., ethyl acetate) in printing operations, regeneration of acetone-based semiconductor cleaning solutions, and emergency containment of marine hydrocarbon pollutants.
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