查找使用阿拉丁产品的科研文献

A structured phase change material integrated by MXene/AgNWs modified dual-network and polyethylene glycol for energy storage and thermal management

Yan Ma,Minming Zou,Wenjing Chen,Wenxing Luo,Xiaowu Hu,Shikun Xiao,Lixiang Luo,Xiongxin Jiang,Qinglin Li

Phase change materials (PCMs) present promising potential in the application of thermal management. Nevertheless, low thermal conductivity and risk of liquid leakage hindered the development of PCMs with broad adoption. Here, we fabricate a shape-stable composite phase change material by encapsulating polyethylene glycol (PEG) into a dual-network hydrogel, which was modified using Ti 3 C 2 T x MXenes and silver nanowires (AgNWs). With the synergistic effect of MXene nanosheets and AgNWs, the composite material that was prepared demonstrates a significant increase in thermal conductivity, reaching a value of 0.64 (W/m·K) and also exhibits a suitable photo-thermal conversion efficiency (88.9%). Moreover, the resulting composite PCM with high-level of PEG loading (90.1%) deliver a remarkable phase change enthalpy (124.8 J/g), highlighting its excellent energy storage capability. Additionally, the final composite displays reliable structural stability and exceptional thermal management performance by reducing the operational temperature of a typical lithium-ion battery by over 12 °C during a 3C discharge process. We demonstrate a promising approach for developing composite PCM for thermal management.

Nanosilver modified navel orange peel foam/polyethylene glycol composite phase change materials with improved thermal conductivity and photo-thermal conversion efficiency

Shikun Xiao,Minming Zou,Yuqiong Xie,Wenjing Chen,Xiaowu Hu,Yan Ma,Shuai Zu,Yinhui Che,Xiongxin Jiang

Porous carbon-based composite phase change materials (CPCMs) have received widespread attention from researchers for their stable shape and considerable latent heat storage capacity. Here, using navel orange peel-based porous carbon (BPC) as the support carrier, nano-Ag as the surface modification material and polyethylene glycol (PEG) for the phase change medium, a novel PEG/BPC-Ag (Ag@CPCM) was fabricated by vacuum impregnation. Surprisingly, the experimental results indicated that nano-Ag modified the BPC could make the Ag@CPCM have stronger photo-thermal conversion ability, higher thermal conductivity and better thermal reliability. Significantly, the addition of nano-Ag increased the thermal conductivity of navel orange peel-based CPCMs to 0.639 W/m K (Ag@CPCM) from 0.313 W/m K (PEG/BPC), and its relative enthalpy efficiency η raised to 107.2 % from 104.8 %, and its photo-thermal conversion efficiency θ increased to 94.7 % from 77.2 %. Furthermore, the prepared novel CPCMs maintained its original phase change properties after 100 thermal cycles of testing, which demonstrated that the prepared CPCMs possessed favorable thermal stability and reusability . Overall, the Ag@CPCM materials have great potential for applications such as thermal management and solar energy storage.

CaCO3 loaded lipid microspheres prepared by the solid-in-oil-in-water emulsions technique with propylene glycol alginate and xanthan gum

Li Gongwei,Zhao Yicong,Zhang Jie,Hao Jia,Xu Duoxia,Cao Yanping

Calcium carbonate (CaCO3) is difficult to deliver in food matrices due to its poor solubility. In this work, CaCO3 powders were encapsulated into Solid-in-Oil-in-Water (S/O/W) emulsions to fabricate delivery systems. The impact of the concentrations of propylene glycol alginate and Xanthan gum (PGA-XG) complexes on the physical stability and structural characteristics of S/O/W calcium-lipid emulsions microspheres were studied. The S/O/W calcium-lipid emulsions were characterized by the particle size, zeta potential, physical stability, and apparent viscosity. The S/O/W calcium-lipid emulsion has higher physical stability (including 6-week storage at 4°C), smaller mean particle size (7.60 ± 1.10 μm), and higher negative zeta-potential (45.91 ± 0.97 mV) when the concentration of PGA-XG complexes was 0.8 wt%. Moreover, Confocal laser scanning microscopy (CLSM) images confirmed that the CaCO3 powders were encapsulated in the O phase. Transmission electron microscopy (TEM) showed that S/O/W calcium-lipid emulsion was spherical. The X-ray diffraction (XRD) analysis further confirmed that CaCO3 was loaded in the S/O/W calcium-lipid emulsion as an amorphous state. The formation mechanism of S/O/W calcium-lipid microspheres was studied by Fourier transform infrared spectroscopy (FTIR) and Raman spectrum analysis. This study provided new ideas that accelerate the creation of a novel type of calcium preparation with higher quality utilization.

Coupling Tetraalkylammonium and Ethylene Glycol Ether Side Chain To Enable Highly Soluble Anthraquinone-Based Ionic Species for Nonaqueous Redox Flow Battery

Yihan Zhen,Cuijuan Zhang,Yongdan Li

Nonaqueous redox flow batteries (NARFBs) have promise for large-scale energy storage with high energy density. Developing advanced active materials is of paramount importance to achieve high stability and energy density. Herein, we adopt the molecular engineering strategy by coupling tetraalkylammonium and an ethylene glycol ether side chain to design anthraquinone-based ionic active species. By adjusting the length of the ethylene glycol ether chain, an ionic active species 2-((9,10-dioxo-9,10-dihydroanthracen-1-yl)amino)-N-(2-(2-methoxyethoxy)ethyl)-(N,N-dimethylethan-1-aminium)-bis(trifluoromethylsulfonyl)imide (AQEG2TFSI) with high solubility and stability is obtained. Paired with a FcNTFSI cathode, the full battery provides an impressive cycling performance with discharge capacity retentions of 99.96% and 99.74% per cycle over 100 cycles with 0.1 and 0.4 M AQEG2TFSI, respectively.

Bioactive Poly(4-hydroxybutyrate)/Poly(ethylene glycol) Fibrous Dressings Incorporated with Zinc Oxide Nanoparticles for Efficient Antibacterial Therapy and Rapid Clotting

Shuaishuai Yuan,Xiuxia Sun,Yong Shen,Zhibo Li

Antibacterial and hemostatic properties are of great importance to wound dressing in treating trauma. Poly(4-hydroxybutyrate) (P4HB), an U.S. Food and Drug Administration (FDA)-approved bioabsorbable polyester, is used as dermal substitutes to prevent sever wound contraction and improve wound healing. However, P4HB fibrous mats are not efficient in halting bleeding and preventing bacterial associated infection. Here the authors prepare a new kind of wound dressing by incorporating poly(ethylene glycol) (PEG) and zinc oxide (ZnO) nanoparticles into the P4HB matrix by using electrospinning method. The in vitro results reveal that the P4HB/PEG/ZnO dressings can synergistically help blood clotting, prevent bacteria adhesion, and kill bacteria efficiently. It's found that the bactericidal activity of the bioactive P4HB/PEG/ZnO dressings is related to the release of Zn 2+ ions rather than reactive oxygen species (ROS) under dark condition. The in vivo antibacterial evaluation indicates that the bioactive P4HB/PEG/ZnO dressings can successfully prevent wound infections in Sprague–Dawley (SD) rats’ skin defect model. The in vivo hemostatic experiments evaluated in the rabbit ear injury model further confirm that the bioactive P4HB/PEG/ZnO dressings have excellent hemostatic performance. Hence, this study demonstrates that the bioactive P4HB/PEG/ZnO dressings with hemostatic and bactericidal properties have great potential in possible clinical applications.

Boron-doped activated carbon catalyzed reduction of dilute nitrite acid in oxidative esterification reaction in the coal to ethylene glycol process

Min Zheng,Zhong-Ning Xu,Ming-Lai Fu

Coal to ethylene glycol (CTEG) technology has attracted more and more attention in the past decades. However, the by-production of nitric acid (NA) during oxidative esterification reaction not only causes equipment corrosion but also increases the cost of nitrogen replenishment and wastewater treatment , therefore it is meaningful to convert NA to useful feedstock. Herein, non-metallic B doped activated carbon (B-AC) was prepared and used to activate the reduction of NA. The structure and physicochemical properties of B-AC were firstly examined by SEM, ICP-OES, N 2 adsorption and desorption isotherms, FT-IR, Raman, and XPS spectrum. Furthermore, the catalytic performance and stability of B-AC were evaluated in the batch experiments. Results showed that BET surface area and pore volume of B-AC decreased with the increase of B doping amount, and the content of BC 3 component enhanced with the increase of calcination temperature. B-AC-800(10) with the mass ratio of AC to BA of 10 and the calcinated temperature of800 °C performed the best activity with about 85% and 66% conversion under 2% and 5% of NA solution, and each catalytic performance of B-AC is about 10% higher than pure AC. The slight blockage of pore structure due to the residual NA and the fall of B atoms from B-AC together lead to a decline of about 20% in NA conversion after five cycles. These findings indicated the application of B-AC as a promising catalyst to reduce NA wastewater in the CTEG process.

Facilitation of PdPb nanoalloy anchored on rGO/MOF-derived δ-Ga2O3 nanorod for electrocatalytic oxidation of methanol, ethanol and ethylene glycol

Yuting Zhong,Yalan Hu,Han Mo,Zhirui Wu,Xin Fu,Liqun Zhou,Hongying Liu,Ling Li,Xiaoguang Liu

A wrinkled rGO modified nanorod gallium oxides (Ga 2 O 3 ) anchored PdPb nanoalloys composite (PdPb@rGO/Ga 2 O 3 ) was prepared using GO/Ga-MOF as the precursor by facile hydrothermal, calcination and reduction approach, and then applied as an electrocatalyst for alcohols electrooxidation. Electrochemical tests show that the fabricated PdPb@rGO/Ga 2 O 3 exhibits superior electrocatalytic activity and high anti-CO poisoning capability for methanol, ethanol and ethylene glycol oxidation reactions (MOR, EOR and EGOR), outperforming Pd@rGO/Ga 2 O 3 and commercial Pd/C. Specifically, the bimetallic electrocatalyst owns the highest forward peak current density of 115.84 mA cm −2 , 146.97 mA cm −2 and 226.59 mA cm −2 , which is 4.69, 5.08 and 8.38 times of Pd/C for MOR, EOR and EGOR, respectively. After 3600 s CA test, the retained current density of PdPb@rGO/Ga 2 O 3 achieves the initial 59.24%, 71.13% and 81.71% towards MOR, EOR and EGOR, respectively. The remarkable performance is attributed to the electronic effects of PdPb nanoalloys, which can improve the electronic structure of Pd d-band, while the surface decoration of Pb/PbO NPs can dramatically adsorb more oxy-species and accelerate the oxidative removal of CO (ads) . Moreover, the oxidation mechanisms of three alcohols and the removal processes of CO (ads) on the Pd surface are analyzed in detail.

Polyethylene glycol-modified mesoporous polydopamine nanoparticles co-loaded with dimethylcurcumin and indocyanine green for combination therapy of castration-resistant prostate cancer

Jun Hong,Yating Tang,Mengting Zhou,Jing Deng,Hang Hu,Defeng Xu

Herein, polyethylene glycol-modified mesoporous polydopamine (PEG-MPDA) nanoparticles co-loaded with indocyanine green (ICG) and dimethylcurcumin (ASC-J9, DMC) were developed for combination therapy of castration-resistant prostate cancer. MPDA nanoparticles were prepared and surface modified with methoxypolyethylene glycol amine (mPEG-NH 2 , M.W. 2000 and 5000). The prepared PEG2000-MPDA and PEG5000-MPDA nanoparticles were characterized by dynamic light scattering (DLS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM). ICG and DMC co-loaded PEG2000-MPDA and PEG5000-MPDA nanoparticles ( [email protected] &DMC and [email protected] &DMC) were prepared by a solvent diffusion method. The decrease in drug feeding ratios results in decline in drug loading content and increase in drug encapsulation rate. [email protected] &DMC and [email protected] &DMC nanoparticles with relatively high drug loading content (ICG 10.0 ± 0.5% and 9.2 ± 0.3%, DMC 6.7 ± 0.2% and 6.4 ± 0.3%) were selected for further studies. The hydrodynamic diameters of these two nanoparticles are between 200 and 300  nm . These two nanoparticles display enhanced stability of ICG in aqueous solution, near-infrared (NIR) laser irradiation-promoted DMC release, efficient photothermal effect, enhanced cellular uptake, and excellent biocompatibility . In in vitro antitumor effect study, these two nanoparticles exhibit enhanced antitumor effect against 22Rv1 cells as compared to ICG&DMC mixture upon 808 nm laser irradiation. Western blot analyses indicate that these two nanoparticles enhance the degradation of androgen receptor (AR) significantly. This work provides a novel strategy and an effective co-delivery system for combinational castration-resistant prostate cancer therapy.

Biodegradable and self-fluorescent ditelluride-bridged mesoporous organosilica/polyethylene glycol-curcumin nanocomposite for dual-responsive drug delivery and enhanced therapy efficiency

X. Xia,J. Shi,Q. Deng,N. Xu,F. Huang,X. Xiang

Mesoporous organosilica as drug delivery carriers capable of achieving improved cargo release, enhanced biodegradation, and direct imaging with prolonged circulation time and tracking cargo distribution is highly in demand for biomedical applications. Herein, we report a ditelluride-bridged mesoporous organosilica nanoparticle (DTeMSN)/polyethylene glycol-curcumin (PEG-CCM) nanocomposite through coassembly with oxidative/redox and self-fluorescent response. Tellurium is introduced into the silica framework for the first time as a drug delivery vehicle. In this case, the DTeMSNs as an inner core enable disassembly under oxidative and redox conditions via the cleavage of ditelluride bond, facilitating the drug release of doxorubicin (DOX) in a matrix degradation controlled manner. Through the systematical comparison of diselenide-bridged MSNs and DTeMSNs, DTeMSNs exhibit remarkable advantages in loading capacity, drug release, and degradation behavior, thereby significantly affecting the cytotoxicity and antitumor efficacy. The self-fluorescent response of PEG-CCM shell coated on the surface of DTeMSNs can real-timely track the cellular uptake, DOX release, and biodistribution owing to the intrinsic and stable fluorescence of CCM. Moreover, PEG-CCM could prolong circulation time, provide preferable drug accumulation in tumors, and increase antitumor efficacy of DOX-loaded DTeMSNs. Our findings are likely to enrich the family of organosilica that served as fluorescence-guided drug delivery carriers.

Melting Behaviors of Bio-Based Poly(propylene 2,5-furan dicarboxylate)-b-poly(ethylene glycol) Co Polymers Related to Their Crystal Morphology

Ouyang Shi,Peng Li,Chao Yang,Haitian Jiang,Liyue Qin,Wentao Liu,Xiaolin Li,Zhenming Chen

In this experiment, a series of poly(propylene 2,5-furan dicarboxylate)-b-poly(ethylene glycol) (PPFEG) copolymers with different ratios were synthesized using melt polycondensation of dimethylfuran-2,5-dicarboxylate (DMFD), 1,3-propanediol (PDO) and poly(ethylene glycol) (PEG). The effect of PEG content on the crystallization behavior of the poly(propylene 2,5-furan dicarboxylate) (PPF) copolymers was investigated. For PPF, the nucleation density of theβ-crystals was higher than that ofα-crystals. AsTcincreases, theβcrystals are suppressed more, but atTc= 140 °C, the bulk of PPF has already been converted toαcrystals, which crystallize faster at higher nucleation densities, resulting in a difference in polymer properties. For this case, we chose to add a soft segment material, PEG, which led to an early multi–melt crystallization behavior of the PPF. The addition of PEG led to a decrease in the crystallization temperature of PPF, as well as a decrease in the cold crystallization peak of PPF. From the crystalline morphology, it can be seen that the addition of PEG caused the transformation of the PPF crystalline form to occur earlier. From the crystalline morphology of PPF at 155 °C, it can be observed that the ring-banded spherical crystals of the PPF appear slowly with increasing time. With the addition of PEG, spherical crystals of the ring band appeared earlier, and even appeared first, and then disappeared slowly.

A Novel Polymer-Salt Complex Based on LiCl Doped SPEEK/Poly(Ether Ether Ketone)-Co-Poly(Ethylene Glycol) for Humidity Sensors

Zhuang Zhuang,Yunfeng Li,Xifang Li,Chengji Zhao

Polyethylene glycol-coated ultrasmall superparamagnetic iron oxide nanoparticles-coupled sialyl Lewis X nanotheranostic platform for nasopharyngeal carcinoma imaging and photothermal therapy

Liu Qinmin,Liu Lijuan,Mo Chunwei,Zhou Xiao,Chen Dongming,He Yu,He Hailu,Kang Wei,Zhao Yongfeng,Jin Guanqiao

Background Nasopharyngeal carcinoma (NPC) is a type of head and neck malignant tumor with a high incidence in specific regional distribution, and its traditional therapies face some challenges. It has become an urgent need to seek new therapeutic strategies without or with low toxicity and side effects. At present, more and more researchers has been attracting attention by nanotheranostic platform. Therefore, our team synthesized the polyethylene glycol-coated ultrasmall superparamagnetic iron oxide nanoparticles-coupled sialyl Lewis X (USPIO-PEG-sLex) nanotheranostic platform with high temperature pyrolysis.Results The USPIO-PEG-sLex nanoparticles had excellent photothermal conversion property, and the temperature of USPIO-PEG-sLex nanoparticles solution increased with its concentration and power density of near-infrared (NIR) on 808 nm wavelengths. Five USPIO-PEG-sLex nanoparticles with different concentrations of 0 mg/ml, 0.025 mg/ml, 0.05 mg/ml, 0.1 mg/ml and 0.2 mg/ml were prepared. The biological toxicity results showed that the viability of NPC 5-8F cells is related to the concentration of USPIO-PEG-sLex nanoparticles and the culture time (P < 0.001). The results of photothermal therapy (PTT) in vitro indicated that the viability of 5-8F cells decreased significantly with the concentration of USPIO-PEG-sLex nanoparticles increases (P < 0.001), and the viability of NPC 5-8F cells were 91.04% ± 5.20%, 77.83% ± 3.01%, 73.48% ± 5.55%, 59.50% ± 10.98%, 17.11% ± 3.14%, respectively. The USPIO-PEG-sLex nanoparticles could target the tumor area, and reduce the T2* value of tumor tissue. The T2* values of tumor pre- and post-injection were 30.870 ± 5.604 and 18.335 ± 4.351, respectively (P < 0.001). In addition, USPIO-PEG-sLex nanoparticles as a photothermal agent for PTT could effectively inhibit tumor progression. The ratio of volume change between tail vein injection group, control group, nanoparticles without laser irradiation group and blank group after 5 treatments were 3.04 ± 0.57, 5.80 ± 1.06, 8.09 ± 1.96, 7.89 ± 2.20, respectively (P < 0.001).Conclusion sOur synthesized USPIO-PEG-sLex nanotheranostic platform, and it may be become a new strategy for the treatment of NPC.Graphic Abstract