FUEL
·
2024
·
IF 6.7
Bin Sun,Peilun Wang,Chongkun Shao,Pengfei Jiang,Yongsheng Guo,Shu Yan,Wenjun Fang
To enhance the stability of oil–water emulsions and expand their potential applications, we designed and synthesized a series of comb-block copolymers, hexadecyl methacrylate-co-poly (ethylene glycol) methyl ether methacrylate (HMA-PEGMA). By precisely adjusting the hydrophilic to hydrophobic block ratios, these copolymers demonstrated effective stabilization in both W/O and O/W emulsions. Characterization via cryogenic transmission electron microscopy (cryo-TEM) and scanning electron microscopy (SEM) confirmed their self-assembly into micellar structures. At a concentration of 1250 mg/L, HMA-PEGMA with block ratios of 3:1 and 1:2 stabilized emulsions for over 24 h, resisting centrifugal forces up to 2000 rpm and maintaining stability across a temperature range of 20–70 °C. The stability mechanisms of the dodecane/water emulsions were elucidated through macroscopic observation, dynamic light scattering (DLS), polarized optical microscopy (POM), interfacial tension measurements, and interfacial film rheology tests. A comparative analysis with commercial emulsifiers highlighted the superior performance of HMA-PEGMA, particularly in stabilizing crude oil emulsions from the Liaohe oilfield. Due to its efficient synthesis and eco-friendly characteristics, HMA-PEGMA presents significant potential for industrial applications.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Xianrui Jiang,Tianyu Hu,Ke Yao,Ruotong Xiong,Jiashu Qu,Qichang Liu,Chaolu Niu,Potao Sun,Wenxia Sima
Thermal faults occur in the continuous operation of electrical equipment. This poses a threat to the stable operation of power systems. However, existing detection methods do not apply to large-scale temperature measurement scenarios due to high cost and poor stability. To solve the above problems, a reversible thermochromic microcapsule is proposed in this work. Silicone rubber composite can be endowed with thermal sensing capability by doping an appropriate amount of thermochromic microcapsules inside the silicone rubber matrix. The test results showed that the color of the obtained thermochromic composites changed sensitively with the change in external temperature. The material undergoes a sudden color change at about 50°C achieving a reversible color change from blue to colorless. The color difference before and after the color change can be up to 37.24. In addition, the color difference shows an exponential decay trend with time. When the dopant concentration of the microcapsules is 1.5 wt%, the composite material shows excellent color-changing performance, and the insulation strength is increased by 6.92% compared with the pure silicone rubber. Meanwhile, the water contact angle of the composite is 115.3°, which proves that it has good hydrophobicity. Notably, the thermochromic composite also showed excellent weathering properties in thermal aging experiments. The thermochromic microcapsule proposed in this work can realize the visualization of the local overheating state of the electrical equipment, which provides a new idea for the application of thermal fault prewarning of the electrical equipment.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2024
·
IF 1.6
Yifei Gao,Jian Wang,Dehua Xu,Yuxuan Lin,Wenbao Song,Yubo Wang,Fei Xu,Gang Chen
In this article, polyether-modified polysiloxanes were synthesized by the reaction of poly(methyl hydrogen siloxane) (PMHS) with Allyl alcohol polyether B-400. FT-IR, laser particle size analysis, hydrophilic–lipophilic balance (HLB) value test, and surface tension measurements were used to characterize its structures and properties. The results show that the control law for the HLB value of polyether-modified polysiloxanes was obtained as follow: the HLB value increases with increasing hydrogen content of PMHS. When the polyether-modified polysiloxanes were used to emulsify the polysiloxane, at the HLB value of 10.5, the average particle size of the emulsion was about 0.23 μm with a narrow particle size distribution. The emulsion has good emulsifying and dispersing properties, as well as excellent foam elimination and foam inhibition performance. When the cellulose nanofibrils (CNF) was used as a protective agent for the preparing of the polysiloxane defoamer, the stability of the emulsion does not affect, but its foam elimination and foam inhibition of emulsion can be further improved at the presence of CNF. The lowest surface tension of CNF-enhanced polyether-modified polysiloxane defoamer is about 22.4 mN m −1 , which has good surface property. When the concentration of CNF-enhanced polyether-modified polysiloxane defoamer was 0.1 g L −1 , the foam elimination time and foam inhibition time were 5.8 s and 38 min, respectively, at the temperature (80°C) and alkali environment (pH 13).
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yubo Liu,Yang Wu,Yanfei Ma,Peixue Wang,Bo Yu,Xiaowei Pei,Shujuan Liu,Feng Zhou
In recent years, photothermal coatings have attracted researchers much attentions for anti-icing applications. However, the overheating due photothermal effect at midday or in non-icing period is inevitably encountered and results in the speed-up aging of the coatings. Herein, a reversible thermochromic phase-transition heat storage coating (TCHSC) containing thermochromic microcapsules is designed to adjust photothermal efficiency by discoloration during non-icing period. In cold surroundings, the coating surface shows black color and presents a high photothermal efficiency, which can transform solar energy into heat for anti-icing and de-icing effectively. Yet, the color of coating turns to white spontaneously in hot surroundings with a low photothermal generation efficiency, which avoids the overheating of coating. Besides, discoloration is caused by forming unconjuncted structure in thermochromic dye, and meanwhile the heat is stored during phase transition process of dye, which helps to adjust the temperature rising and cooling rate of coating and contributes to de/anti-icing. What’s more, discoloration temperature of thermochromic capsules can be tuned by adjusting the melting point of dye in thermochromic capsules. The TCHSC with heat regulation provides a new strategy to tackle the conventional overheating issue of photothermal anti-icing coating in summer or at midday, paving a key step towards its real applications.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Ling Zhou,Ao Chen,Zhenzhen Liu,Chong Tao,Jing Ding,Jieru Guo,Hao Wu,Weiyi Zhou,Xipo Zhao
Long-term protection of skin-defect wounds is challenging for the common wound dressings cotton gauze due to its weak skin adhesion, limited drug-loading capacity and frequent replacement. Hydrogels are considered as the promising wound dressings benefiting by their good mechanical compatibility and biocompatibility. Nevertheless, the hydrogels always suffer from the drawbacks of fast water evaporation, lack of antibacterial ability and uncontrollable drug release, which greatly shorten their long-term wound protection duration. Herein, a novel and multifunctional phase change gel (PCG) combining flexibility of hydrogel and release-controllable ability of phase change materials (PCMs) was fabricated through a facile solvent-exchange strategy. Specifically, the bacterial cellulose (BC)/polyethylene glycol based phase change gels (BC/PEG PCGs) were prepared by direct impregnation of BC hydrogel into massive PEG melts. The solvent-exchange mechanism between BC hydrogel and PCM melts was firstly studied based on the impregnation experiments of BC gels into various PCMs. The as-prepared BC/PEG PCGs were then characterized in terms of structure, mechanical, phase change and wound dressing properties, subsequently. This work provides a comprehensive understanding of the structure relationship on their excellent flexibility, good adhesive, skin-cooling, antibacterial and controllable drug-release functions of BC/PEG PCGs, extending their potential in the long-term protection of skin-defect wounds.
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PubMed
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
·
2025
·
IF 3.7
Yan Zhang,Huan Liu,Shan Yu,Ruocheng Pei,Haiyang Hu,Weiwei Wang,Ping Xu,Hongzhi Tang
Oil contamination poses significant risks to human health and ecosystems, emphasizing the importance of studying alkane biodegradation. In this study, we found that Rhodococcus erythropolis XP can utilize various alkanes, including C16–C36 n-alkanes and iso-alkane (pristane). The degradation capacity was significant, with over 95% of C20 degraded (500–2,500 mg/L) within 72 h. The bioremediation capacity in oily sludge was determined by a novel Low Pressure Gas Chromatography-Mass Spectrometry methodology especially for rapid analysis (within 12 min) of n-alkanes. Notable biodegradation of C14–C30 alkanes was observed in sludge treated with Rhodococcus erythropolis XP. In addition, metabolic intermediates of C16 and C20 were identified, indicating the presence of both terminal and subterminal pathways in Rhodococcus erythropolis XP. A new Baeyer-Villiger monooxygenase (BVMO_4041) was characterized, which catalyzes a key step in the subterminal pathway of alkane degradation. These results reflect the promise of Rhodococcus erythropolis XP in addressing the pressing need for efficient alkane degradation in contaminated environments.
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Small
·
2025
·
IF 12.1
Wei Cai,Tianyang Cui,Liangyuan Qi,Junling Wang,Wei Wang,Chengfei Cao,Shuo Shi,Xin Hu,Mohammad Ziaur Rahman,Weiyi Xing,De-Yi Wang,Bin Fei
In modern architecture, windows are increasingly employed as curtain wall structures, playing a critical approach in regulating indoor environments to reduce building energy consumption. Meanwhile, the demands for transparency and flame retardancy present significant challenges in guaranteeing people's privacy and safety. In response, a two-layer “smart window” is designed to achieve thermal management, privacy protection, and fire safety, through leveraging the photo-thermal effect of MXene nanosheets, the phase change characteristic of fatty alcohol, and the flame-retardant effect of tetrabromobisphenol A (TBBPA). In the daytime, MXene not only absorbs solar energy to mitigate its heating effect on indoor temperatures and achieve an average decrease of ≈4.2 °C but also facilitates the melting of fatty alcohol to provide optimal daylighting conditions (transmissivity of 65.0%). In the nighttime, the solidified fatty alcohol prevents light transmittance (modulation of 30.6%) and significantly enhances the light deviation to protect personal privacy. Besides, TBBPA dissolved in fatty alcohol effectively enhances the fire safety performance of “smart windows” without sacrificing the transparency. Most importantly, the manufacturing approach is extremely simple to present significant advantages compared to other “smart windows”, promoting its practical application in emerging buildings in terms of energy saving, privacy protection, and fire safety.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2024
·Vol. 47
·期 17
·2400367
·
IF 2.8
Yang Zhao,Jie Li,Yang Yang,Yujie Bi,Changyu Cai,Yanxiong Ke
In this study, spherical silica with pore size varied from 30 to 200 Å was synthesized by pseudomorphic transformation at atmospheric pressure. 40–80 Å silica particles with a narrow pore distribution were obtained by using quaternary amine cationic surfactants and different kinds of swelling agents, including polypropylene glycol, 1,3,5-trimethylbenzene, alkanes, and alkanols. Alkyl imidazolium ionic liquid surfactants were used to synthesize large pore size distribution silica spheres with pore sizes in the range of 110–200 Å. All these silica particles can be synthesized under mild conditions within 12 h, which provides a facile synthesis method for the preparation of a chromatographic matrix with tunable pore size. The method is reproducible and the relative standard deviation of silica sphere pore structure parameters in scaled-up preparations is less than 6%. The pore size on the fraction of low-molecular-weight heparin (LMWH) was investigated in size exclusion chromatography. Matrixes with different pore size distributions have various size exclusion regions. By using UPS-60-Diol columns in a twin-column recirculation separation process, LMWH with >85% heparin with molecular weight within the range of 3000–8000 Da were separated in five-column volumes.
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LANGMUIR
·
2024
·
IF 3.7
Guangzeng Luo,Zhilu Gao,Cuiping Zhou,Yintan Huang,Shuangshuang Hu,Yifan Hu,Chuanyong Zong,Lan Lei,Hui Li
Well-tailored construction of icephobic surfaces with mechanical robustness and investigation of the structure–property relationships at the molecular level are highly desirable. Herein, a series of norbornene-based fluorinated polyolefin copolymers (FPOR-x) with varying norbornenyl dodecafluoroheptyl ester (NDFHE) molar fractions (0–100 mol %) were well-designed and fabricated via living ring-opening metathesis polymerization (ROMP) employing NDFHE and norbornenyl pentafluorophenyl ester (NPFPE) as the soft and hard segments, respectively. The mechanical and icephobic properties of the fluorinated copolymers can be regulated by adjusting the soft NDFHE contents. As a result, the well-designed norbornene-based copolymers exhibited a wide range of tunable mechanical properties, including tensile strength ranging from 0.2 to 26.4 MPa, elastic modulus ranging from 0.6 to 593.7 MPa, and breaking elongations ranging from 5718.7% to 3.7%, correlating with the proportion of soft NDFHE content. Furthermore, the synergistic interplay between soft and hard segments, particularly the hardness in the majority and softness in the minority or vice versa, could achieve a significant difference in the local modulus and enhance the propagations of cracks within the three-phase regions (soft regions/hard regions/ice), ultimately leading to a significant reduction in ice shear strength. Notably, FPOR-25% with a tensile strength of 12.0 MPa and an elastic modulus of 227.5 MPa exhibited a remarkably low ice shear strength of 57.7 kPa. This study not only highlights the relationship between the polymer molecular structure and surface icephobic properties but also breaks the limitations of icephobic surfaces with a low modulus.
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APPLIED THERMAL ENGINEERING
·
2024
·
IF 6.1
Yijun Zhong,Xibo He,Wei Wang,Yawei Xu,Yuxiang Wang,Yong Shuai
Phase change materials (PCM) have emerged as an effective thermal management solution for addressing the heat dissipation challenges in electronic devices, particularly those with high heat flux and prolonged thermal shock duration. However, their commercial application has been hindered by issues such as low thermal conductivity, leakage, and assembly challenges. This paper introduces composite PCM (CPCM) that offer excellent thermal conductivity, flexibility, and stable shape, developed through a process of physical mixing and thermo-compression formation, and evaluates their performance in chip heat dissipation experiments. An olefin block copolymer (OBC) is used as a supporting material to encapsulate 1-hexadecanol (HD), effectively preventing melt leakage while providing thermal flexibility. Graphite is added to create interconnected heat transfer channels within the CPCM. The CPCM with 7.5 wt% expanded graphite (EG) and an HD/OBC mass ratio of 12:8 demonstrates optimal performance, achieving a thermal conductivity of 0.537 W∙m −1 ∙K −1 , a phase transition enthalpy of 152J∙g −1 , and a leakage rate of only 0.846 % after 200 thermal cycles. In simulated electronic chip heat dissipation experiments, the CPCM effectively stores and dissipates heat, maintaining the electronic device within a stable and reasonable operating temperature range, thereby proving its effectiveness in the thermal management of electronic devices. The composite is easy to process, exhibits excellent performance, and holds significant potential for widespread application in the temperature control of electronic devices.
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FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Bin Sun,Xiwei Ye,Yongsheng Guo,Shu Yan,Wenjun Fang
Turbulent flow in high-speed hydrocarbon fuels increases engine resistance and pump load, leading to higher power demands and reduced reliability. Current drag reduction agents often worsen heat transfer performance. To overcome the contradiction between drag reduction and heat transfer deterioration, comb-type ternary block copolymers, hexadecyl methacrylate-co-dimethylaminoethyl methacrylate-co-methacrylic acid, have been designed and synthesized through photoinitiated polymerization and used as emulsifiers to prepare emulsified fuels. The emulsions with different compositions of JP-10 to water as 9.5:0.5, 9:1, 8.5:1.5, and 8:2, respectively, were characterized using creaming index analysis, dynamic light scattering and zeta potential measurements, rheological analysis, laser scanning confocal microscopy and polarized optical microscopy measurements, interfacial tension and interfacial film rheology measurements. A significant enhancement in heat sink and heat transfer coefficients of the emulsified fuel compared to pure JP-10 is observed within the temperature range from 100 to 225 °C. Simultaneous enhancements in drag reduction rate and heat transfer coefficient for the emulsified fuel in a distributed flow calorimeter can reach 19.5 % and 6.09 %, respectively. Emulsified fuels show great prospects in improving the stable and highly efficient operation of advanced aircraft.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Yingnan Zhu,Jiahang Si,Tiantian Xu,Lan Zheng,Xinyu Xiao,Xiaohan Sun,He Ding,Yuze Dong
Chemodynamic therapy (CDT) and photodynamic therapy (PDT) have emerged as promising strategies for treating skin abscesses. However, their therapeutic efficacy is fundamentally constrained by the hypoxic and hydrogen peroxide-deficient microenvironment characteristic of abscesses. Herein, we developed a near-infrared (NIR) light-responsive nanoplatform (ICG/CuO2@PCM) by encapsulating copper peroxide (CuO2) and indocyanine green (ICG) within a phase-change material (PCM), which enables control over self-supplied H2O2/O2 release via an NIR-triggered cascade. Upon irradiation, ICG-mediated photothermal conversion elevates the temperature beyond the PCM melting threshold, triggering a burst release of CuO2 and ICG. CuO2 generates hydroxyl radicals (•OH) through a Fenton-like reaction in the acidic wound microenvironment. Additionally, CuO2 can thermally decompose under photothermal conditions to produce a sustained oxygen supply, which ICG immediately converts into singlet oxygen (1O2), thereby enhancing PDT efficiency. Furthermore, photothermal therapy not only enhances the efficiency of CDT but also provides additional antibacterial support. Remarkably, ICG/CuO2@PCM (NPs), coupled with irradiation, accelerate abscess wound recovery by dispersing biofilm, killing bacteria, and promoting macrophage polarization toward an anti-inflammatory phenotype. Overall, this NIR-responsive nanoplatform highlights the promise in controlled modulation of microenvironment-adaptive antimicrobial strategies to overcome current limitations of hypoxic infections.
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