INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Lu Liu,Xuejun Zhang,Lin Chen,Feng F. Hong
Many attempts have been made on the efficient production and high value-added application of a nano-scale cellulose product (nanocellulose), composed of plant nanocellulose fiber (PNC) and bacterial nanocellulose (BNC). However, the functional performance of products composed of PNC and BNC is poorly understood. It was hypothesized that nanocomposites based on these two nanocellulose types would show similar physicochemical properties, biocompatibility, and therapeutic efficacy for wound treatment, despite the presence of a unique 3D nanofibril network in BNC. With the aim of determining the more efficient hemostatic sponge for widespread application, two nanocomposite sponges produced from TEMPO-oxidized PNC (OPNC) and BNC (OBNC) were therefore compared in detail with two commercial hemostatic sponges. Two nanocomposite sponges, OPNC/COL/CS and OBNC/COL/CS, were obtained via electrostatic self-assembly using a combination of anionic oxidized cellulose and cationic chitosan (CS) to wrap collagen (COL) in a sandwich structure. The physical characterization of the two nanocomposites revealed minimal differences. The results demonstrated that both OPNC/COL/CS and OBNC/COL/CS exhibited strong antimicrobial properties, with similar in vitro hemocompatibility, in vivo hemostatic efficiency, histocompatibility, and biodegradability. Further experiments using two animal bleeding models demonstrated that both materials outperformed commercial hemostatic sponges in blood absorption and hemostatic efficacy.
研究领域:
材料科学
·
医学
·
生物工程
✓ 已验证
产品关联
DOI
高影响因子
Materials Horizons
·
2024
·
IF 12.2
Xiao Chen,Jiaqing Su,Sha Cheng,Cheng Huang,Chunxia Zhao,Chao Teng,Pengchao Zhang
Ultrathin nanofibrous films with unique properties, such as controlled thickness, structures, and excellent mechanical robustness, play a vital role in flexible wearable devices, electronic skin, and rechargeable batteries. However, nanofibrous films are always facing limitations in their mechanical properties, even though they are strong when used as textiles, mainly owing to their structural shortcomings by using conventional fabrication methods. Herein, we present the fabrication of free-standing ultrathin nanofibrous films with good mechanical properties by using a microfluidic-based continuous printing strategy. Owing to the precisely controllable microfluidic flow in the micrometre-scale, the resulting aramid nanofibre (ANF) films can reach thicknesses as low as 140 ± 25 nm. Specifically, the tensile strength of such ultrathin ANF films is recorded at an impressive value of 667 ± 40 MPa, representing a 120% improvement compared to the films prepared by using casting method. Such excellent mechanical robustness comes from the double-sided protonation, which shows a symmetrically dense structure compared to the asymmetric structure of cast films. Furthermore, we demonstrate the continuous fabrication of thin regenerated cellulose nanofiber (RCNF) and cellulose diacetate (CDA) films using the microfluidic-based printing strategy. Both microfluidic-based films show significant enhancements in strength, with a 42% increase for RCNF and a 94% increase for CDA compared to their cast films. We envision that this microfluidic-based continuous printing strategy provides a promising pathway for the development of advanced ultrathin nanofibrous films towards practical applications.
研究领域:
材料科学
·
纳米技术
·
柔性电子
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2011
·
IF 2.12
Hao Shao,Xuebin Zhang,Shasha Liu,Fanyan Chen,Jie Xu,Yi Feng
In this paper, iron nanofibers were successfully produced by electrospinning of ferric nitrate–PVA solutions to corresponding PVA/Fe(NO 3 ) 3 composite nanofibers followed by calcinations and reduction. The thermal stability of the as-prepared PVA/Fe(NO 3 ) 3 composite nanofibers were investigated by TG–DSC. The morphologies and structures of the as-prepared samples were also characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The results obtained indicated that: the thermal transformation of ferric nitrate and the decomposition of PVA in PVA/Fe(NO 3 ) 3 composite nanofibers ended at 310 °C and 460 °C respectively. The as-prepared iron nanofibers showed a continuous morphology and a very high degree of crystallization. Furthermore, the average diameter was about 180 nm.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2013
·Vol. 13
·期 3
·1983-1987
·
IF 1.149
Zhu Yajun,Zhang Xuebin,Ji Yi,Feng Yi,Zhang Jingcheng
This paper describes a procedure of synthesizing long WS2 nanofibers. WO3 nanofibers were prepared as precursors by electrospinning of ammonium meta-tungstate (AMT), polyvinyl alcohol (PVA) and alcohol solution followed by calcination at 550 °C in air. WS2
nanofibers were obtained by sulfurization of the WO3 nanofibres at 800 °C in an argon atmosphere, with sulfur powder acting as sulfuration reducer. The nanofibres were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron
microscopy (SEM), energy dispersive X-ray (EDX), and transmission electron microscopy (TEM). The results show that the final products are pure WS2 nanofibres, which have high aspect ratio. The WS2 nanofibers with rough surface were formed of nanoparticles, while some
nanoflakes appeared on the surface of WS2 nanofibres. The diameters of the WS2 nanofibers were between 200 and 300 nm, which is similar to WO3 nanofibers. In addition, the WS2 nanofibers were polycrystalline.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Gels
·
2021
·Vol. 7
·期 4
·223
·
IF 4.702
Xinbin Ji,Jing Guo,Fucheng Guan,Yuanfa Liu,Qiang Yang,Xin Zhang,Yi Xu
Using polyvinyl alcohol (PVA) and nanocellulose (NC) as raw materials, PVA/NC nanofiber membranes were prepared by electrospinning. The hydrogen bonding, crystalline properties and microscopic appearance of PVA/NC membranes with different NC contents were characterized. The mechanical properties, liquid absorption and cytotoxicity of the nanofiber membrane were evaluated. The results show that the free hydroxyl group of the PVA/NC nanofiber membranes have a maximum value of 9% at a mass fraction of 6% NC. The crystallinity of the PVA/NC nanofiber membranes and the average diameter of the nanofibers decreased and then increased as the NC content increased, with a minimum value of 38.23% and 272.03 nm, respectively, at 6% NC content. At this time, the contact angle was the smallest. The maximum strength of the PVA/NC nanofiber membranes is 75.8% higher than that of the PVA membrane at 2% NC content. With increasing NC content, the absorption of water, PBS sustained-release suspensions and artificial blood by PVA/NC nanofiber membranes increases. Cytotoxicity tests have shown that PVA/NC nanofiber membranes are non-toxic, have good cytocompatibility and are expected to be used in the field of medical dressings.Keywords:polyvinyl alcohol;nanocellulose;wound dressing;nanofiber membranes;electrospinning
研究领域:
生物材料学
·
医学工程
·
组织工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 36
·2103989
·
IF 18.808
Xiao Wang,Yuanyuan Zhang,Yun Zhao,Guang Li,Jianhua Yan,Jianyong Yu,Bin Ding
Inorganic materials assembled with rigid elements such as crystals or graphitized carbon generally show brittleness and hardness. However, it is found that both TiO 2 ceramic crystal nanofibers (NFs) and carbon NFs show superior flexibility, in which the former are surprisingly knottable and the latter exhibit excellent bending-resilience property. The different flexure mechanisms are revealed by fabricating composite NFs of these two constituents and find that the carbon NFs can be recovered to the original states after releasing the external force, while the bending-resilience is weakened and the softness of the composite NFs is enhanced upon increasing the TiO 2 content. The graphitized carbon can store mechanical deformation energy that enables the NFs with bending-resilience, while both the homogeneous interfaces between TiO 2 crystals and the heterogeneous interfaces between TiO 2 and carbon can alleviate stress concentration, which reduce the flexural modulus of the composite NFs. By filling different contents of elastic carbon into TiO 2 NFs, a series of flexible NFs that exhibit gradient bending-resilience properties are fabricated. This study provides a deeper understanding of the mechanical properties of inorganic materials.
研究领域:
材料科学
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纳米技术
·
陶瓷学
·
材料力学性能
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yuqi Sheng,Haina Qi,Ning Li,Yunrui Xie,Hong Shao,Yaolin Hu,Dan Li,Qianli Ma,Guixia Liu,Xiangting Dong
It is an important strategy to rationally design and construct specific-shaped microscopic nanostructures for developing poly-functional nanomaterials for different advanced applications. In this work, a novel technique combining a parallel electrospinning with a subsequent bi-crucible fluorination is advanced and utilized to facilely synthesize a brand-new peculiar one-dimensional (1D) wire-in-tube nanofiber//nanofiber shaped Janus nanofiber (WJNF) to refrain from usual complicated preparation procedures. Partition of four independent domains in the peculiar-structured Janus nanofiber is microscopically realized. The Janus nanofiber with four microscopic partitions can be applied to assemble various functions to avoid adverse mutual impacts among functions to realize multi-functionalization of the materials. As a case study, [YF 3 :Yb 3+ , Er 3+ @SiO 2 ]//CoFe 2 O 4 WJNFs with synchronous excellent upconversion luminescence and tunable magnetism are designed and constructed by the above technique. One side of the WJNF is composed of YF 3 :Yb 3+ , Er 3+ @SiO 2 wire-in-tube nanofiber with YF 3 :Yb 3+ , Er 3+ nanofiber as core layer and SiO 2 as shell layer, and the other side is composed of CoFe 2 O 4 magnetic nanofiber. YF 3 :Yb 3+ , Er 3+ green upconversion luminescent nanofiber is completely separated from CoFe 2 O 4 to fully avoid the weakening of luminescent intensity caused by the direct contact between luminescent and magnetic substances, and thus the luminescent intensity of [YF 3 :Yb 3+ , Er 3+ @SiO 2 ]//CoFe 2 O 4 WJNFs is apparently enhanced. Up-conversion luminescent intensity and magnetism of the WJNFs are modulated by tuning the contents of CoFe 2 O 4 . With the increase of CoFe 2 O 4 content, the saturation magnetization of the WJNFs increases from 3.91 to 12.90 emu·g −1 , revealing the tunable magnetism of the product. The formation mechanism of WJNFs is advanced, and a corresponding facile construction technique is established to shun complicated process, which provides theoretical guidance and technical support for the design and preparation of other poly-functional nanomaterials.
研究领域:
材料科学
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纳米技术
·
光学
·
磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Shuyue Xu,Yibo Zhao,Wenjing He,Lu Chang,Mingyan Wang,Cheng Wang,Kean Wang,Minjie Cui,Yuchen Zhang
In this study, N-doped carbon nanofibers were prepared by carbonization using p-phenylenediamine (PPD)-modified polyaniline nanofibers as precursors. The effects of PPD dosage, carbonization temperature, and potassium hydroxide (KOH) dosage on the performance of carbonized products were investigated in detail. The uniformity of the carbon nanofiber networks improved considerably using 2% PPD. Consequently, the specific capacitance of the carbon nanofibers at 0.5 A/g was enhanced by 42.5%. In addition, KOH activation increased the specific capacitance of the carbonized product to 273.3 F/g at 0.5 A/g. The product exhibited a lifespan of up to 4500 cycles with 87.2% retention. Remarkably, when the mass loading was increased to 16 mg/cm2, the product still possessed a high specific capacitance of 254 F/g at 0.5 A/g.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Yan Liang,Hongyang Ma,Ahmed Aboueloyoun Taha,Benjamin S. Hsiao
High-flux nanofibrous composite ultrafiltration (UF) membranes consist of nanocellulose integrated polyacrylonitrile (PAN) as the barrier layer and electrospun PAN nanofibers deposited on a polyethylene terephthalate (PET) non-woven mat as the supporting layer were fabricated by solution coating approach. The chemical composition of nanofibrous composite membranes was investigated with ATR-FTIR, TGA , and EDX measurements, while the top and cross-sectional morphology of the membranes were observed via SEM and AFM scans. An interpenetrating nanofiber-polymer network was created in the barrier layer which drastically enhanced the mechanical strength of the composite membrane. The hydrophilicity of the nanofibrous composite membranes increased with nanocellulose component evidenced by water contact angle measurements, which could enhance the anti-fouling properties of the membranes. The as-prepared membranes were investigated for protein separation and wastewater treatment . The ultrafiltration performance of nanofibrous composite membranes with different composition ratios of nanocellulose to PAN was demonstrated using a cross-flow filtration system, the highest pure water permeability of 1508 L/(m 2 h·MPa) was achieved with a coating solution of 0.10 wt% of nanocellulose and 0.05 wt% of PAN where it created optimized water channels in the barrier layer of the composite membranes. The molecular weight cut-off (MWCO) of these membranes was determined with dextran as a marker, where the maximum pore size of the membranes varied in the range of 20.8–46.0 nm. Moreover, proteins and polypeptides with different molecular weights were employed to challenge the nanofiber composite membrane performance. High permeation flux of 147.1 L/m 2 h and high rejection ratio of 98.4% were accomplished; meanwhile, the high selectivity against protein and polypeptides was attained, indicating the membrane's applicability for the selective separation. The anti-fouling properties of the nanofibrous composite membranes were also intensely investigated and the filtration efficiency, in terms of permeation flux and rejection ratio, was evaluated and compared with that of commercially available UF membranes (UN100, US050, and UE050) that possess similar membrane pore size. The permeation flux of the nanofibrous composite membrane was 2–3 times higher than that of commercial membranes, due to the formation of water channels in the barrier layer, while the rejection ratio remained the same as 99.6%, indicating that the nanofibrous composite membrane could be a good candidate for wastewater treatment, in addition to the highly selective separation of proteins.
研究领域:
材料科学
·
环境工程
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 5
·930
·
IF 4.967
Lingyan Zhang,Wenting Ren,Fangqingxin Liu,Linmin Xia,Xiaomei Wu,Rilong Yang,Yan Yu,Xuexia Zhang
The structure and chemical composition of cell walls play a vital role in the bioconversion and utilization of plants. In the present study, the cell wall structure and chemical composition of pith and rind from sunflower stalks were compared and correlated to their nanofibrillation efficiency with ultrasonic treatment. Mild chemical pretreatment using 1% or 4% NaOH without any bleaching process were applied prior to ultrasonication nanofibrillation. Significant structural and chemical differences were demonstrated between the pith and rind, with the former exhibiting a much lower lignin and hemicellulose contents, higher pectin, much looser cell structure and higher cell wall porosity than the latter. Alkaline treatment alone was sufficient to eliminate most of the hemicellulose and pectin from stalk pith, whereas only partial removal of hemicellulose and lignin was achieved for the woody rind part. After 30 min of ultrasonic treatment, the stalk pith exhibited fully defibrillated fibrils with a continuous and entangled micro/nanofibrillated network, whereas numerous micron-sized fiber and fragments remained for the rind. The results indicated that stalk pith is less recalcitrant and easier to be fibrillated with ultrasonication than rind, which must be correlated to their distinct differences in both structure and chemical composition.Keywords:sunflower stalk;chemical composition;cell structure;cellulose nanofiber;nanofibrillation
研究领域:
植物学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 43
·20174-20186
·
IF 4.682
Wang Yafang,Dang Wanbin,Yao Cheng,Tian Cuiyu,Lu Zhaoqing
Traditional mica-based composites are limited to the application in high-voltage electric insulation by their underdeveloped breakdown strength and mechanical robustness. Herein, a novel double-network mica-based composite film was fabricated by introducing aramid nanofiber (ANF) and nanofibrillated cellulose (NFC), which cooperatively enhanced interfacial adhesion and reinforcing effect. The ANF-NFC/mica@PDA composite film exhibited high mechanical strength (~ 28.76 MPa), excellent dielectric breakdown strength (~ 33.45 kV/mm) and positive mechanical flexibility. Moreover, the composite represented stable dielectric property at high temperature, which meant the ANF-NFC/mica@PDA composite film could be applied in more complex environments. This work provides a new route toward manufacturing superior performance mica-based composites for the electrical insulation field.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2020
·
IF 3.275
Boyu Du,Changzhou Chen,Yang Sun,Mengtian Yu,Bingyang Liu,Xing Wang,Jinghui Zhou
We reported a new approach for development of lignin bio-oil-based electrospun nanofibers (LENFs) that had high substitution ratio (up to 80 wt%) and good morphology. This approach was particularly unique and translatable as it used small molecule lignin bio-oil with high reactivity and low heterogeneity obtained via lignin depolymerization reaction to produce well-oriented LENFs. Firstly, effects of various blends solutions ratios and electrospinning parameters on the characteristics of the obtained LENFs were analyzed. The results showed that the optimal parameters that resulted in the best electrospun nanofibers were as follows: blend solution ratio, the 20 wt% blend solution containing 80 wt% straw lignin bio-oil (SLB) and 20 wt% polyacrylonitrile (PAN), flow rate , 1 mL/h, voltage, 20 kV, rotational speed, 500 r/min and the distance between needle and collection screen, 20 cm. Secondly, used the best LENFs, we also applied to prepare lignin bio-oil-based carbon nanofibers (LCNFs) and estimated its properties by scanning electron microscope (SEM), X-ray diffraction (XRD) patterns, Raman spectroscopy and tension testing. Our results demonstrated that compared with pure PAN carbon nanofibers (PCNFs), the as-prepared LCNFs had similar smooth surfaces, similar crystallinity and similar mechanical properties. This work can promote the utilization of lignin depolymerization main-products to produce lignin-based materials, while also help to reduce use of high-cost PAN.
研究领域:
材料科学
·
生物质能
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）