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solution blow spinning mass production of mullite nanofiber from environment friendly aqueous Al–Si solutions

Progress in Natural Science:Materials International 2023年第5期33卷 691-700页

作者： Xinpeng Jin Jiugang Li Chi Zhang Keshuai Liu Chong He Wenbin Li School of Textile Science and Engineering Wuhan Textile University State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University

Achieving large-scale production of high-performance mullite ceramic nanofibers posed a formidable challenge.Herein, an air heating-solution blow spinning technique was designed for the mass fabrication of mullite nanofibers at high speeds, ranging from 6 to 60 ml/h. Spinnable aqueous Al–Si solution systems, employing various aluminum sources, were systematically investigated. The optimization of the solution blow spinning apparatus involved the incorporation of a hot air blow device capable of dispensing streams of hot, dry air. Comprehensive investigations were conducted to examine the impact of variables such as spinning solution viscosity, spinning rate, and spinning distance on the resulting mullite fiber diameter and morphology. Following sintering at 1200°C, mullite fiber cotton was successfully synthesized, exhibiting diameters spanning from 500 nm to 5 μm. These mullite nanofiber cotton demonstrated exceptional attributes, including robust temperature stability(up to 1300°C), remarkable thermal insulation properties and superior filtration efficiency.

关键词： Aqueous solution Mullite nanofiber solution blow spinning Thermal insulation

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Double-stretching as an effective and generalizable strategy towards thinner nanofibers in solution blow spinning

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Nano Research 2023年第4期16卷 5709-5714页

作者： Baopu Zhang Ziwei Li Zekun Cheng Lei Li Chong Yang Haiyang Wang Hui Wu State Key Laboratory of Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Chemical Engineering Massachusetts Institute of TechnologyCambridge 02139USA

solution blow spinning(SBS)applies high-speed airflow to prepare fibers by generating a strong stretching force.It has the advantages of scalable production,tailorable morphologies,and wide applicability.Yet,the SBS strategy can hardly prepare fibers down to the sub-100 nanometers,which limits its performance in demanding applications.Herein,we overcome the limitation of SBS by introducing a second airflow.This novel strategy is termed double-stretching SBS(DS-SBS)because an extra stretching force is exerted on the fiber when it converges with the second airflow.Polyamide6 nanofibers with an average diameter of 80 nm are successfully prepared with the DS-SBS strategy,while the SBS strategy could only prepare submicron fibers with an average diameter of 120 nm.Further,the generality of the DS-SBS strategy to reduce fiber diameter is verified on numerous solute-solvent pairs.

关键词： nanofibers solution blow spinning double-stretching computational fluid dynamics

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Polycaprolactone/polyvinyl pyrrolidone nanofibers developed by solution blow spinning for encapsulation of chlorogenic acid

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Food Quality and Safety 2022年第2期6卷 265-274页

作者：曹阳沈超怡杨智超蔡子涵邓子安吴迪 The Rural Development Academy Zhejiang UniversityHangzhouChina College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhouChina College of Agriculture&Biotechnology Zhejiang UniversityHangzhouChina and Zhejiang University Zhongyuan Institute ZhengzhouChina

Study on the application of nanofibers in food active packaging has been a research hotspot in recent years.In this work,solution blow spinning(SBS)was applied to rapidly fabricate the polycaprolactone(PCL),polyvinyl pyrrolidone(PVP),and PCL/PVP nanofibrous films to encapsulate chlorogenic acid(CGA).All films showed uniform and smooth nanofibers,and the Fourier transform infrared spectroscopy and X-ray diffraction proved the success of mixed spinning of PCL and PVP.With the increase of PVP content,the thermal stability of the PCL/PVP nanofibrous films improved.The PCL/PVP(weight ratio of 4:1)film possessed better mechanical properties than PCL and PVP films be-cause of the stronger fiber-fiber interactions.The addition of PCL endowed the hydrophobic surfaces to the PCL/PVP films,and the PCL/PVP films had better water vapor barrier ability.The PCL/PVP(4:1)film exhibited the best long-term continuous release of CGA during 72 h.The PVP nanofibrous film exhibited no inhibition against Staphylococcus aureus and Escherichia coli due to the low encapsulation efficiency,but the PCL and PCL/PVP films exhibited good antimicrobial activity.The above results suggested that the nanofibrous fims developed by SBS possess promising prospects in food packaging.

关键词： solution blow spinning polycaprolactone polvinyl prrolidone chlorogenic acid long-term continuous release

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A non-surgical suturing strategy for rapid cardiac hemostasis

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Nano Research 2023年第1期16卷 810-821页

作者： Yuan Gao Jun Zhang Nan Cheng Zhong Liu Yuan-Bin Wu Qian-Qian Zhou Chen-Yan Li Miao Yu Seeram Ramakrishna Rong Wang Yun-Ze Long Collaborative Innovation Center for Nanomaterials&Devices College of PhysicsQingdao UniversityQingdao 266071China Department of Adult Cardiac Surgery the Sixth Medical Center of PLA General HospitalBeijing 100084China Institute of Health Service and Transfusion Medicine Beijing 100850China Center for Nanofibers&Nanotechnology Department of Mechanical EngineeringNational University of SingaporeSingapore 117574Singapore State Key Laboratory of Bio-Fibers&Eco-Textiles Qingdao 266071China

As the central organ of the human body,once the heart is damaged,it will cause devastating damage to the circulation system of the whole body,often leading to rapid death.Currently,the only treatment option to stop bleeding in penetrating cardiac injuries is surgical suturing,which is extremely complex and risky.In addition,it is difficult to implement this kind of treatment in battlefields with poor medical conditions.Therefore,there is an urgent need to develop an effective cardiac hemostasis strategy.In this work,we propose a two-step hemostasis strategy that can effectively stop bleeding for penetrating heart injuries.That is,cardiac hemostatic plug(CHP)is made from the nanocomposite(polylactic acid/gelatin/absorbable hemostatic particles,PLA/GEL/AHP)with high biosafety,excellent hemostatic performance,and degradability which is used to block cardiac bleeding,and then wound surface is sealed by in-situ electrospun medical glue fibers(N-octyl-2-cyanoacrylate,interfacial toughness:221±23 J·m−2),thus completing cardiac hemostasis(porcine heart with 1 cm diameter penetrating wound).The hemostasis process is simple and quick(solution blow spinning that is suitable for doping various functional particles,and the PLA/GEL/AHP composite nanofiber membrane prepared by this method is also a promising hemostatic material.

关键词： heart cardiac hemostasis nanocomposite solution blow spinning electrospinning

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Carbon dots embedded nanofiber films:Large-scale fabrication and enhanced mechanical properties

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Chinese Chemical Letters 2022年第1期33卷 304-307页

作者： Chang Liu Rui Cheng Jiazhuang Guo Ge Li He Li Hong-Gang Ye Zhi-Bin Liang Cai-Feng Wang Su Chen State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical Engineeringand Jiangsu Key Laboratory of Fine Chemicals and Functional Polymer MaterialsNanjing Tech UniversityNanjing 210009China

Valuable application prospects and large-scale production technologies are powerful driving forces for the development of materials science.Carbon dots(CDs)are a kind of promising carbon-based fluorescent nanomaterials,which possess wide application prospects based and even beyond the fluorescence properties.Herein,we report the fast and high-yield synthesis of CDs and the large-scale preparation of fluorescent nanofiber films with enhanced mechanical properties.CDs were prepared from magnetic hyperthermia treatment of citric acid and carbamide,with the output of 25.37 g in a single batch.The asprepared CDs exhibit a high absolute photoluminescence(PL)quantum yield(QY)of 67%and wonderful dispersibility in polar solvents.Then,solution blow spinning of CDs and polymer matrixes of alcohol soluble polyurethane(APU)and polyacrylonitrile(PAN)led to large-area fluorescent CDs-embedded nanofiber films,APU/CDs(size:120 cm×18 cm)and PAN/CDs(size:120 cm×22 cm),respectively.The resultant large-area APU/CDs and PAN/CDs nanofiber films have dramatically enhanced mechanical properties,to show integrated improvement of tensile strength and elongation.

关键词： Carbon dots Mass production solution blow spinning Nanofiber Mechanical properties

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