IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
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2022
·Vol. 29
·期 6
·2190-2198
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IF 2.509
Feipeng Wang,Zijian Yang,Jingliang Huang,Yuyang Yan,Jian Li
Insulating oil is indispensable cooling impregnation and isolation agent for oil-filled electrical equipment, such as power transformers. The aging byproducts, i.e., water and organic acids, impose a serious threat to these expensive transformers. Insulating oil reclamation is a complicated process. In this article, a polyvinylidene fluoride (PVDF) polymer with polytetrafluoroethylene (PTFE) additive composite nanofiber membrane is synthesized for insulating oil reclamation with high efficiency. The reclamation and dielectric performance of the PVDF/PTFE nanofiber membrane is evaluated by the acid value, microwater (MW) contents, and ac breakdown voltage of the treated oil. The results show that the nanofiber membrane filtration rate toward acetic acid and MW is 69.4% and 76.0%, respectively. Moreover, the dielectric loss factor and relative permittivity of treated oil decrease significantly at low frequencies, and the breakdown voltage is increased from 21.8 to 65.2 kV. The PVDF/PTFE composite nanofiber membrane has removed organic acid and MW effectively, and it provides a more practical method for insulating oil reclamation.
研究领域:
材料科学
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电气工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2011
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IF 2.502
Ruixue Yin,Zi Tong,Dongzhi Yang,Jun Nie
Glucose and pH dual-responsive microhydrogels based on concanavalin A (Con A) were prepared and used for insulin delivery. The combination of the specific saccharide-binding affinity of Con A and the cationic groups of N-(2-(dimethylamino) ethyl)-methacrylamide (DMAEMA) led to dual-responsive systems. SEM, fluorescence microscopy and particle size analysis showed that the obtained microhydrogels had a dense surface morphology and an average size of 38 μm. The in vitro insulin release study revealed that the microhydrogels could quickly respond to the changes of glucose concentrations in the medium and small change in pH value of the environment. The kinetics of insulin release was analyzed by using empirical equation and the apparent diffusion coefficient was calculated according to a solution of Fick's second law. The released insulin was proved to remain active. The result suggested that this microhydrogel might find potential applications for self-regulated insulin delivery, actuators and separation systems with sensitivity to glucose.
研究领域:
生物材料学
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药物递送系统
✓ 已验证
DOI
高影响因子
Chemistry-An Asian Journal
·
2022
·Vol. 17
·期 24
·e202200731
·
IF 4.839
Jingcheng Zhang,Linhan Huang,Taoxiong Fang,Zhipeng Xiang,Sijia He,Pekka Peljo,Shiyu Gan,Xinjian Huang,Haiqiang Deng
Graphical With single-entity collisional electrochemistry , anionic ionosomes (i. e., negatively-charged nanoscopic water clusters wrapped by an ionic bilayer) are quantitatively analysed at a positively polarized micro-water/oil interface. When Cl − -ionosomes in the organic phase collide/fuse with the polarized interface formed at the very tip of a micropipette, chloride ions will be released from an ionosome into the water phase manifested as a current spike along the timeline. Fusion mechanism along with sizing of ionosomes are readily uncovered via detailed analysis of the current spikes. Single-entity collisional electrochemistry (SECE) can capture physicochemical information at the single entity level. In the present work, we systematically studied in-situ generation and detection of single anionic ionosomes via SECE combined with a miniaturized interface between two immiscible electrolyte solutions (ITIES). Ionosome is an ionic-bilayer encapsulated nanoscopic water cluster/droplet that carries a net charge. Discrete spiky ionic currents were observed upon collisions/fusions of individual F − or Cl − -ionosomes with a positively polarized micro-ITIES. This fusion process was proved to follow the bulk electrolysis model. With this method, some essential factors such as concentration and charge density of the hydrated anions, and the interfacial area, were revealed. It demonstrates that anionic ionosomes share a common theoretical framework with their counterparts (i. e., cationic ionosomes, like Li + -ionosomes). This work will spur the advancements in a myriad of fields, including such as the colloid and interface science, micro- and/or nanoscale electrochemistry, and electrophysiology and brain sciences.
研究领域:
胶体与界面科学
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微/纳米尺度电化学
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电生理学与脑科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD AND BIOPRODUCTS PROCESSING
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2025
·
IF 3.4
Shenghai Liu,Yuxuan Liang,Wei Gong,Kaiyu Jiang,Xiuping Dong,Beiwei Zhu,Juncai Tu
Conventional lipid extraction from fish by-products typically relies on high water input and disruption by thermal or hydrolysis to break emulsions and release oil. This study introduces a fundamentally reversed mechanism by micro-aqueous extraction (MAE). This method induces oil release via limited hydration and reassembly of the soft matter without heat or dilution. This MAE approach first dehydrates fish by-products until moisture content reaching ~18%, reassembly forming a protein–lipid matrix of high internal phase emulsion gel (φ ~75%). Upon controlled micro-aqueous hydration and low-shear agitation, structured proteins aggregate and destabilize oil droplets and release entrapped oil. Compared to heat extraction (HE), MAE achieved higher oil recovery (94.3% vs. 76.4%), shortened processing time by 35%, and decreased oil total oxidation value (TOTOX 1.33 vs. 2.88). Life cycle assessment confirmed lower environmental burden with 62% reduction in CO₂ emission. The fish meal obtained by MAE retained superior emulsifying activity and structural integrity. Mechanistically, micro-aqueous hydration reduced α-helix content of proteins and decreased oil droplet stability, thereby promoting demulsification. In contrast, drying at 60 °C resulted in lower turbidity and smaller aggregation size of myofibrillar proteins compared to drying at 30 °C, which enhanced their interfacial stabilization. Rheological analysis further revealed that water-limited restructuring of the myofibrillar network played a critical role in controlling viscoelasticity (as reflected by G', G'') and extraction efficiency. This work reveals a counterintuitive pathway for oil recovery, governed by moisture-regulated soft-matter reorganization, which presents a low-energy, high-yield, and sustainable approach for fish by-product valorisation.
研究领域:
食品科学
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化学工程
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软物质物理
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可持续技术
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海洋生物技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yuanqing Zhu,Rong Fan,Zhiyuan Zheng,Zhiqiang Zhu,Ting Si,Ronald X. Xu
We propose a compound interfacial shearing (CIS) process for versatile production of monodisperse Janus emulsions with controllable structural and topographic features. The process induces an active periodic force to decouple material and process parameters, enables independent control of compartmental features in Janus emulsions, and facilitates inline and on-demand generation of various geometric features for a large variety of process parameters and material properties. Janus emulsions of poly(ethylene glycol) diacrylate (PEGDA) with a controlled number of compartments are produced by CIS and photopolymerized to form micro-hydrogels with designated interfacial curvatures. PEGDA micro-hydrogels can be further modified to achieve anisotropy of surface or internal features by the content of an oily dispersed phase. MCF-7 human breast cancer cells are encapsulated in micro-hydrogels for cell proliferation with satisfactory viability. By modifying PEGDA micro-hydrogels with RGDS-conjugated polystyrene microspheres, we have demonstrated the controlled spatial adhesion of MCF-7 cells and human umbilical vein endothelial cells (HUVECs) on the substrates of different three-dimensional (3D) curvatures. Our pilot study suggests a simple and potentially scalable approach to produce 3D substrates with controllable structural and topographic features for 3D guided cell organization.
研究领域:
材料科学
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生物技术
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细胞生物学
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组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shi Chen,Dawei Cheng,Weimin Bao,Ruyuan Ding,Zhenguo Shen,Wenkai Huang,Yifan Lu,Panpan Zhang,Yiwei Sun,Hemu Chen,Cailiang Shen,Yuanyin Wang
Critical-size bone defects are a common and intractable clinical problem that typically requires filling in with surgical implants to facilitate bone regeneration. Considering the limitations of autologous bone and allogeneic bone in clinical applications, such as secondary damage or immunogenicity, injectable microhydrogels with osteogenic and angiogenic effects have received considerable attention. Herein, polydopamine (PDA)-functionalized strontium alginate/nanohydroxyapatite (Sr-Alg/nHA) composite microhydrogels loaded with vascular endothelial growth factor (VEGF) were prepared using microfluidic technology. This composite microhydrogel released strontium ions stably for at least 42 days to promote bone formation. The PDA coating can release VEGF in a controlled manner, effectively promote angiogenesis around bone defects, and provide nutritional support for new bone formation. In in vitro experiments, the composite microhydrogels had good biocompatibility. The PDA coating greatly improves cell adhesion on the composite microhydrogel and provides good controlled release of VEGF. Therefore, this composite microhydrogel effectively promotes osteogenic differentiation and vascularization. In in vivo experiments, composite microhydrogels were injected into critical-size bone defects in the skull of rats, and they were shown by microcomputed tomography and tissue sections to be effective in promoting bone regeneration. These findings demonstrated that this novel microhydrogel effectively promotes bone formation and angiogenesis at the site of bone defects.
研究领域:
生物材料
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组织工程
·
生物医学工程
·
骨科
✓ 已验证
DOI
PubMed
高影响因子
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