Journal of Materials Chemistry C
·
2024
·
IF 5.7
Shizhen Song,Tengfei Zheng,Bo Li,Hangcheng Yang,Qin-Xiang Jia,Zhuting Hao,Wen Zhang,Ying Zhang
Solvent vapor-driven soft actuators have been seen as promising devices for human-environment interaction and gained considerable attention in recent years. Considering the limited types of response solvent and the lack of quantification, MOF/polymer intelligent soft actuators may be a potential candidate of the fabrication of the bio solvent-driven actuators. Thus, this paper present a multiple solvent-driven soft actuator based on MIL-88B/PVDF asymmetric film, and also the comparison to the analogs based on other MIL-88(Fe) series flexible MOFs (including MIL-88A, 88C and 88D) was made for the deformation-structure relationship and the solvent-driven mechanism investigation. The deformation behavior to various organic solvent (including methanol, toluene and chloroform) of the MIL-88(Fe)/PVDF composite films have been investigated, and the structure and composition of the MIL88(Fe) fillers and the composite films were also characterized by SEM, FT-IR, and XRD. Based on the above results, the MIL-88B/PVDF composite which shows the diversity of response objects and the fast deformation response to most of the organic solvents through the solvent swelling/adsorption of the MOF skeleton, was used to fabricate a monolayer soft film composed by MIL-88B, carbon black (CB) and PVDF, namely MIL-88B/CB/PVDF. The MIL-88B/CB/PVDF film not only realizes the excellent deformation-discolor dual-responsive to methanol atmosphere with the visible deformation which could being quickly achieved within 1s under 10 vol % methanol atmosphere and the maximum crimp angle being up to 558o within about 50 s, and also a wide color change range including six view angle-dependent high saturation color (red, orange, yellow, green, blue and purple), but also shows an approximate linear relationship to three of the organic solvents (methanol, toluene and chloroform) between the maximum curl angle and the solvent concentration. Furthermore, several smart devices have also been fabricated, including the methanol-driven bionic petals, worm robot, alertor and LIG sensor. Therefore, such soft composites of flexible MOF and polymer have great potential in bio-robot and this work may provide new design strategy for the MOFs/polymer smart materials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Jiazhuang Guo,Pan Zhang,Liangliang Zhu,Hao Chen,Hai-Xia Shen,Cai-Feng Wang,Su Chen
Multicolor emissive carbon dots (CDs) have received increasing attention due to their excellent optical features. By far, insufficient studies have been conducted on the preparation and modulation of multicolor CDs, and most of the precursors used for the synthesis of multicolor CDs own benzene rings. Here, we report the solvent-engineered preparation of CDs with bright multicolor emissions. The CDs are fabricated by hydrothermal/solvothermal treatment of citric acid and cyanamide, circumventing the use of precursors containing aromatic molecules as well as the medium of concentrated acids. By simply changing the reaction solvent, the emission wavelength of the CDs shifts from the blue to yellow region, and even white emissive CDs are obtained. Specifically, blue, cyan, yellow, and white emissive CDs are obtained to exhibit photoluminescence quantum yields (PL QYs) ranging from 19.7% to 62.3%. Further studies show that the bright fluorescence might originate from molecular fluorophore grafting on the CD surface. Moreover, CDs/polymer composites with uniform bright luminescence are prepared and used as fluorescent color-converting materials for fabricating multicolor LEDs. This study extends the modulated preparation of multicolor emissive CDs that are potentially useful for optoelectronic applications.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ruzhen Zhao,Manxing Huo,Qifeng Wei,Xiulian Ren
Ensuring a continuous and sustainable supply of lithium requires the development of green and efficient separation processes, such as liquid-liquid extraction for primary sources. In this work, a green method of extracting Li + from Qinghai old brine by using benzene sulfonamides is proposed. The method forms a green extraction system by hydrogen bonding between long-chain alcohol and benzene sulfonamide substance N221. It is proved that the formation of hydrogen bond promotes the ionization of N221 by means of conductivity measurement, equilibrium constant calculation, molecular dynamics simulation . This system has an obvious attraction to Li + , and the highest extraction efficiency of Li + can reach 95 %, and amine substances are added to maintain the pH of the system. The extraction effect is comparable to TBP (tributyl phosphate) and functional ionic liquid . After stripping, Li + enters the aqueous phase, and the separation effect is desirable. Therefore, a new green extractant is proposed in this study, which provides a new idea for green and environmentally friendly lithium extraction .
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Yingbo Li,Jing Ma,Hongjun Lin,Cheng Chen,Saleam Raza,Qianqian Zeng,Xinchun Lu,Liguo Shen
The development of composite membranes utilizing transition metal carbides and nitrides, exemplified by Ti 3 C 2 T x (MXene), has proven efficacious in the treatment of oily wastewater. However, challenges arise from the prolonged and convoluted transport paths within MXene interlayer nanochannels, significantly impeding mass transfer and diminishing membrane permeability. This investigation incorporated porous covalent organic frameworks (COFs) as intercalating agents into two-dimensional (2D) MXene-based membranes to expand the interlayer nanochannels. The resulting MXene@COF-TpBD functional layer polyethersulfone (PES) composite membrane exhibited a distinctive dual superoleophobic surface, concurrently manifesting underwater superoleophobicity and underoil superhydrophobicity (underwater oil contact angle >150°, underoil water contact angle >150°). The membranes exhibited excellent water flux (up to 4092.7 L m −2 h −1 ·bar −1 ), efficient oil-water emulsion separation (up to 1908.4 L m −2 h −1 ·bar −1 , rejection rates >99.78 %), noteworthy fouling resistance and structural stability, outperforming most of existing similar membranes. Furthermore, supported by the extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory, the incorporation of COF-TpBD improved the antifouling characteristics of the composite membrane. This work presents innovative insights into the improvement of 2D MXene membranes and the use of COF-TpBD for the specific remediation of oily wastewater.
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhicong Liang,Jiali Tang,Dario R. Dekel,Xuezhong He
Membrane separation is in the spotlight as one of the most cost-effective technologies without chemicals for carbon capture. This work aims to fabricate thin film composite (TFC) membranes for boosting CO 2 separation. Commercial polysulfone (PSf) flat sheet membranes pre-treated with ethanol solutions were used as support materials by coating with amino-functionalized cross-linked polydimethylsiloxane (PDMS) interlayer. It is worth noting that the developed amino-functionalized PDMS interlayer based on a novel wet-coating method to avoid the penetration of coating solution, which provides better compatibility with the coated polyamide selective layer and also the facilitated transport for CO 2 permeation. A thin CO 2 -selective layer was obtained by interfacial polymerization (IP) between trimesoyl chloride (TMC) in the organic phase and diethylene glycol bis(3-aminopropyl) ether (DGBAmE or EO3) in the aqueous phase to enhance the CO 2 /N 2 selectivity. Both the IP process and the membrane preparation parameters such as heat-treatment temperature, and monomer concentration were systematically optimized. It was found that the best membrane prepared with 9.9 mmol/L TMC monomer solution presents a CO 2 permeance of 81 GPU and a CO 2 /N 2 selectivity of 65, which was significantly enhanced from the non-selective supports. This work provides a facile approach for tuning the TFC membrane performance for CO 2 separation and can be extended to make high-performance membranes for industrial CO 2 capture by selecting more permeable supports.
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ACS Omega
·
2024
·
IF 3.7
Liyuan Cai,Jingchun Wu,Miaoxin Zhang,Keliang Wang,Zhao Yang
Phase separation of microemulsions occupies a key position in many applications, such as oil recovery, nanomaterial synthesis, and chemical reactions. Achieving an intelligent response is crucial to microemulsion development and application. For this reason, in this study, CO2-responsive superamphiphilic molecules were developed as rapidly switchable oil-in-water microemulsions. These superhydrophilic molecules with linear structures were produced by electrostatic interaction of stearic acid and aminotrimethyltriazine COSM-1 in a 1:1 molar ratio. The introduction of n-butanol as a cosurfactant in the CO2-responsive microemulsion system resulted in the spontaneous formation of stable microemulsions. The effect of the addition of n-butanol on the carbon dioxide-responsive microemulsion system was investigated, and the optimum amount of n-butanol was determined by optimization. After exposure to CO2 for 30 s, the superhydrophilic molecules decomposed into inactive components at the interface, leading to a complete phase separation of the microemulsion into oil and water phases. The system was purged with N2 at 60 °C for 10 min to remove the CO2, and the phase separation system was transformed into a clear microemulsion, which was then evaluated for its properties. The rapid response and complete demulsification of these surface CNFS superamphiphiles to CO2 suggest that they have promising applications in product separation, microemulsion recovery, and enhanced crude oil recovery.
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Petroleum Science
·
2024
·
IF 6
Yang Liu,Zheng-Nan Sun,Guo-Lin Jing,Yi-Hai Yang,Hui Jiang,Xiao-Yan Liu
The effect of alcoholic polyethylene-vinyl acetate (EVA) product ethylene-vinyl alcohol copolymer (EVAL) on the low-temperature flow properties of model oil containing asphaltene (ASP) was investigated. The change of wax crystal microscopic morphology of model oil before and after modification were examined, and the influence of asphaltene mass fraction on the rheological improvement effect of EVAL was analyzed. The composite system of EVAL and asphaltene significantly reduced the pour point, gel point, apparent viscosity, storage modulus and loss modulus of waxy oil at low temperatures. When the EVAL concentration is 400 ppm and the asphaltene mass fraction is 0.5 wt%, the synergistic effect of the two is optimal, which can reduce the pour point by 17 °C and the modulus value by more than 98%. The introduction of EVAL strengthens the interaction between asphaltenes and wax crystals, forming EVAL-ASP aggregates, which promote the adsorption of wax crystals on asphaltenes to form composite particles, and the polar groups prevent the aggregation of wax crystals and reduce the size of wax crystals, thus greatly improving the fluidity of waxy oils.
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TRIBOLOGY INTERNATIONAL
·
2024
·
IF 6.1
Guangrong Sha,Rui Yu,Bingbing Lai,Yiping Sun,Wenjing Lou,Xiaobo Wang,Shuai Li,Xiaoling Liu
The aging of lubricants is a primary factor contributing to rolling bearing failures. The rolling stability test simulated the aging behavior of grease under shear and high-temperature circumstances. An investigation was conducted on how mechanical-thermal aging impacts the chemical and physical structures of polyurea grease, as well as how changes in thickener microstructure affect rheological and tribological properties. The results show that under shear and high temperature, structural changes in urea lead to a transformation of the thickener morphologies from the growth of entangled ribbon fiber to a large-diameter rod structure, with a significant decrease in the degree of entanglement. When a certain proportion of fibrous and rod structures coexist, the grease has good oil separation capacity, the structural stabilities of grease become weak, and the deformation resistance decreases. During this phase, the polyurea grease has the best tribological performance .
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PHYSICA SCRIPTA
·
2024
·Vol. 99
·期 3
·035924
·
IF 2.6
Ke Zhao,Jianzhao Cao,Ying Qi,Peng Wei,Jian Cheng,Yahong Xie
In our study, we selected three prevalent coal types from Xinjiang: Dahuangshan coal (referred to as Y-coal), Black Mountain coal (B-coal), and Kuche coal (K-coal). Initially, we assessed their morphological differences using electron microscopy. Subsequently, we evaluated the superiority of Y-coal through Thermogravimetric Analysis (TGA). Furthermore, we compared their performances using various electrochemical tests, including the J-V curve, dark current curve, open-circuit voltage curve, and Electrochemical Impedance Spectroscopy (EIS) curve. Ultimately, we investigated the potential of synthesizing graphene from Y-coal and its derivatives. The first step was the preparation of multilayer graphene (MG) by treating Y-coal with acid to obtain demineralized coal, followed by treatment in a tube furnace to obtain ultrafine powdered MG. The second step was then followed by successive oxidation and ultrasonication of the already obtained MG to obtain graphene oxide (GO). Finally, ascorbic acid (VC) was selected to treat GO to prepare an aqueous suspension of reduced graphene oxide (rGO). MG (2θ = 26.2°), GO (2θ = 12.4°) and rGO (2θ = 25.5°) were obtained by XRD analysis. C 1s and O 1S were analyzed by XPS spectra. The functional groups −OH, C=O, and −C=C–, which are unique to graphene and its derivatives, were comparatively analyzed using infrared spectroscopy. The change of π→π* was analyzed by the UV–vis method. The absorbance was further found in combination with PL spectra. Immediately after, the morphology of graphite and its derivatives was analyzed by SEM, HRTEM, the physical properties by contact angle and BET, and finally the content of elements C and O by EDS. The successful demonstration of the superiority of the synthesized MG and its derivatives was achieved.
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MEASUREMENT SCIENCE and TECHNOLOGY
·
2025
·Vol. 36
·期 3
·035110
·
IF 3.4
Qianchun Zhang,Chengcheng Wan,Jiumei He,Zhaoru Ban,Shan Tang,Li Jiang,Yanju Chen,Xixi Long
In this study, mesoporous MgO nanoparticles were successfully synthesized using carbon quantum dots as templates and an outstanding cataluminescence sensor system was established based on these nanoparticles. In a particular situation, the constructed sensor demonstrated remarkable linear range was 0.3106–310.6 ppm (R2 = 0.9990) with a low limit of detection of 0.0994 ppm and a signal-to-noise ratio (S/N) of 3. The mesoporous MgO nanoparticle sensor was utilized to analyze the isobutyraldehyde content in real samples. Outstanding recoveries were achieved within range of 83.4%–111%, with the relative standard deviations (n = 7) ranging from 2.0% to 8.2%. Moreover, the 35 d test results showed that the sensor has good stability. Density functional theory and gas chromatography-mass spectrometry were used to research the mechanism of the designed cataluminescence sensor. This work presents a universal methodology for constructing isobutyraldehyde gas sensors with high sensitivity and selectivity, and mesoporous MgO nanoparticles sensors that expand the applications available in the industry and environment analysis.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Shaoqin Yin,Yuchao Niu,Shaofu Du,Juncheng Hao,Yuandong Jia,Wu Xiao,Gaohong He,Xiaobin Jiang
Pharmaceutical crystallization wastewater typically contains high concentrations of valuable active pharmaceutical ingredients (APIs) and organic antisolvent. The current approach to treating this wastewater stream, while effective for environmentally benign disposal, could be further developed to enhance its resource recovery potential. Herein, pervaporation crystallization (PVCr) and the specific membrane were developed to simultaneously achieve the organic solvent recovery and induced crystal nucleation. The fabricated membrane, owing to its superior intrinsic hydrophilicity, significantly reduces the critical nucleation energy barrier and creates high local supersaturation via preferential water permeation. With the ideal nucleation condition on the membrane surface, effective ethanol enrichment provided a gentle driving force for crystal growth, leading to high-quality, non-agglomerated single crystals ( d = 1.42 μm, CV = 24.45%) with a 94% yield at 30°C and 1 atm. These fine crystals are ideal for direct seeding into the traditional crystallizer. Recovered high-purity ethanol and water streams are suitable as antisolvent and solvent in the production section, respectively. According to process simulation results, PVCr reduced operating costs by 60.7%, thereby improving environmental performance by avoiding the energy-intensive separation process of repeatedly vaporizing and condensing the reflux. These results demonstrate that the PVCr assembled with customized functional membrane possesses great potential for treating multi-component organic wastewaters.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Xinxin Lv,Yan Hong,Zhengbiao Gu,Li Cheng,Zhaofeng Li,Caiming Li,Xiaofeng Ban
Starch-lipid complexes have potential applications in functional foods, food additives, and food packaging materials. High-amylose corn starch (HACS) is a promising raw material for starch-lipid complexation. To overcome the poor gelatinization of HACS under atmospheric pressure, we leveraged the capacity of a CaCl 2 aqueous solution to dissolve HACS, thereby streamlining the preparation of HACS-lipid complexes. Taking myristic acid (MA) as example, the HACS-MA (H-MA) complex prepared in deionized water exhibited a complexing index (CI) of 36.15 %, whereas that prepared in CaCl 2 aqueous solution achieved a significantly higher CI of 89.03 %. Chemical group analysis and thermal characterization indicated that Ca 2+ ions not only enhanced HACS dissolution through metal-dipole interactions but also bound to the hydroxyl oxygen atoms of starch, forming a coordination structure that promoted a single helical arrangement. This study clarifies the mechanism of starch-lipid complexation in CaCl 2 aqueous solution and defines the role of Ca 2+ ions in the complexes.
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