AIP Advances
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2014
·Vol. 5
·期 4
·
IF 1.59
Han Wang,Minhao Li,Xin Chen,Junwei Zheng,Xindu Chen,Ziming Zhu
Nanostructured components have been receiving considerable attention in recent years. One advantage is the use of near-field electrospinning (NFES) in microdevice manufacture. Multi-nozzle NFES is offered as a technique to increase the high-precision production rate of components. The deposition characteristics of the multi-nozzles were observed and analyzed based on the mutual influence of the jets under varied conditions. It was discovered that the mutual distance of deposition becomes larger with increases in working distance and nozzle spacing, but the influence of voltage is not particularly apparent. This paper discusses the results and conclusions of the experimental investigation and theoretical derivation.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Jinxue Cheng,Qinglin Huang,Yan Huang,Shiwen Yu,Changfa Xiao,Quan Hu
In this research, a novel poly(tetrafluoroethylene) (PTFE) membrane with regular geometric pore structure fabricated by near-field electrospinning (NFES) method was firstly utilized in the preparation of water-in-oil (W/O) emulsion through membrane emulsification process. Effects of NFES PTFE membranes’ pore aspect ratio (length-width ratio of rectangle pore structure) on the water-in-oil droplet size, droplet size distribution, and uniformity of water-in-oil emulsion was investigated respectively. Results showed that the increase of pore aspect ratio would bring about a smaller water-in-oil droplet size. The average water-in-oil droplet size decreased from 234.9 nm (M-1) to 167.8 nm (M-4) when the pore aspect ratio increased from 1 to 4. Compared with conventional mechanical agitation, the water-in-oil emulsion formed by membrane emulsification process showed not only more uniform water-in-oil droplet size, but also higher long-term stability (remained homogeneous after 30 days). In addition to showing the excellent membrane emulsification performance in harsh environment, the NFES PTFE membrane also exhibited excellent water-in-oil emulsion separation performance. Compared with other NFES PTFE membranes, M-1 membrane showed the highest oil flux (33.4 L m -2 h -1 , -0.02 MPa) and water rejection rate (94.4%) in the separation of water-in-oil emulsion formed by membrane emulsification process.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Jinxue Cheng,Naijia Zhao,Yan Huang,Changfa Xiao,Xiao Ma,Qinglin Huang
Background Membrane emulsification (ME) is an attractive membrane process to produce various kind of simple or multiple emulsions. The membrane utilized in ME process should have high dispersed phase flux, narrow pore size distribution and excellent antifouling property. Methods This work proposed a novel near-field electrospun (NFES) poly(tetrafluoroethylene) (PTFE) membranes with ordered rectangular pore geometry. Compared with other membranes, the order pore geometry of NFES PTFE membrane was helpful to obtain a more homogeneous and more stable water-in-oil (W/O) emulsion. Significant findings The droplet size was simply controlled by the NFES PTFE membrane pore size. And NFES PTFE membrane was more conducive to the formation of droplets with narrow droplet size distribution because of its unique straight rectangular membrane pore geometry. In addition, W/O emulsion droplet size be regulated in coordination with operating parameters and phase parameters. Results indicated that a smaller rectangular pore area of PTFE membrane would lead to a smaller droplet size. Introducing of shear stress in the continuous phase was contributed to the generation of monodisperse droplets. When the emulsifier (Span 80) content was 1wt%, the smallest droplet size (∼103.6 nm) was obtained.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2017
·Vol. 28
·期 41
·415301
·
IF 3.44
Sanyuan Hu,Heping Li,Zhen Su,Youwei Yan
This paper describes a near-field electrospinning technique combined with heat treatment process used to directly align parallel metal oxide and metal nitride fibers on silicon dioxide substrate. The effects of near-field electrospinning parameters (including collector-to-needle distance, applied voltage and the moving speed of the collector) on the morphology of the resulted fibers have been studied. Metallic salt-contained precursor fibers are individually aligned via near-field electrospinning of metallic salts and polymeric solution mixtures. After applying calcination process to these well aligned precursor fibers, patterning by metal oxide and metal nitride fibers such as ZnO, Ga2O3, TiO2, GaN and TiN is successfully obtained. The optical microscope images and the scanning electron microscopy show the presence of fiber patterns, whose crystalline structure is characterized by x-ray diffraction and Raman spectroscopy measurement. The results demonstrate the potential of this approach for assembling ceramic fibers into parallel arrays with controllable orientation and position.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Jinxue Cheng,Naijia Zhao,Yuxin Zhang,Yan Huang,Qinglin Huang,Changfa Xiao
Uniform-sized core-shell microspheres have received more and more attentions owing to the therapeutic application such as controlled release and drug targeting. In this work, we proposed a facile method to fabricate core-shell microspheres with uniform size. Polymethyl methacrylate (PMMA)@polylactic acid (PLA) core-shell microspheres with controllable core and shell size were prepared by combining membrane emulsification (ME) technology and solvent evaporation method. Specially, the near-field electrospinning (NFES) poly(tetrafluoroethylene) (PTFE) membranes and biaxially stretched PTFE membranes were utilized in the ME process. Subsequently, a series of PMMA@PLA core-shell microspheres were successfully prepared, where the core size of microspheres depended on the hydrophobic NFES PTFE membrane while the shell size depended on the hydrophilic biaxially stretched PTFE membrane. Meanwhile, the variation of droplet size and distribution with the evaporation temperature, pressure and continuous phase rotating speed were also investigated. When the solvent evaporation temperature was 40 °C, the obtained PMMA@PLA core-shell microspheres showed optimal morphology and size distribution. Moreover, the shell size increased with the increase of operating pressure and the decrease of continuous phase rotating speed. This facile strategy showed great potential for efficiently preparing uniform-sized core-shell microspheres in large scale.
研究领域:
材料科学
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制药工程
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生物医学工程
✓ 已验证
DOI
高影响因子
AIP Advances
·
2017
·Vol. 7
·期 3
·
IF 1.568
Wang Zhifeng,Chen Xindu,Zeng Jun,Liang Feng,Wu Peixuan,Wang Han
For large area micro/nano pattern printing, multi-nozzle electrohydrodynamic (EHD) printing setup is an efficient method to boost productivity in near-field electrospinning (NFES) process. And controlling EHD multi-jet accurate deposition under the interaction of nozzles and other parameters are crucial concerns during the process. The influence and sensitivity of various parameters such as the needle length, needle spacing, electrode-to-collector distance, voltage etc. on the direct-write patterning performance was investigated by orthogonal experiments with dual-nozzle NFES setup, and then the deposition distance estimated based on a novel model was compared with measurement results and proven. More controllable deposition distance and much denser of aligned naofiber can be achieved by rotating the dual-nozzle setup. This study can be greatly contributed to estimate the deposition distance and helpful to guide the multi-nozzle NFES process to accurate direct-write pattern in manufacturing process in future.
研究领域:
材料科学
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纳米技术
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biomedical Nanotechnology
·
2017
·Vol. 13
·期 12
·1725-1734
·
IF 4.521
Ren Shuangshuang,Yao Yingfang,Zhang He,Fan Ruirui,Yu Yijun,Yang Jie,Zhang Rui,Liu Chao,Sun Weibin,Miao Leiying
The periodontal ligament (PDL) is a specific connective tissue composed of organized and aligned collagenous fibers that fix the tooth root in the alveolar bone. The alignment of PDL fibers and their function have been neglected in the past, as many studies investigated the regeneration
of the periodontium, including alveolar bone and cementum regeneration. In this study, we fabricated biodegradable aligned fibers (ε-caprolactone/collagen) by near-field electrospinning (NFE) to control the arrangement of human periodontal ligament stem cells (hPDLSCs), aiming
to guide the oriented regeneration of the periodontal ligament. Compared with random electrospun fibers, the in vitro study investigated the effects of nanotopography on stem cell differentiation of hPDLSCs. The hPDLSCs were identified by flow cytometry, and the multipotency of hPDLSCs
was confirmed by successful osteogenic induction. The hPDLSCs were co-cultured with aligned and random fibers. The cell morphology was observed by confocal micrograph and scanning electron micrograph, which showed that aligned fibers could guide the orientation and elongation of hPDLSCs. The
expression of periodontal ligament-related genes was higher when cultured with aligned fibers than when cultured with random fibers. In conclusion, via near-field electrospinning, aligned biodegradable fibers were prepared and guided the orientation arrangement of hPDLSCs, providing a better
microenvironment for periodontal ligament regeneration. This technology might be further used in the regeneration of tissues in a given direction.
研究领域:
牙科材料
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组织工程
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干细胞生物学
·
再生医学
✓ 已验证
DOI
PubMed
高影响因子
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