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  1. Article ; Online: Current developments of hypercrosslinked polymers as green carbon resources

    Wenliang Song / Yunxin Tang / Minxin Zhang / Deng-Guang Yu

    Current Research in Green and Sustainable Chemistry, Vol 5, Iss , Pp 100335- (2022)

    2022  

    Abstract: Carbons and their composites are the most valuable materials in the modern field of catalysis, energy storage/conversion, and environments. In past decades, breakthroughs have been made in preparing carbon materials, such as fullerenes, carbon nanotubes, ...

    Abstract Carbons and their composites are the most valuable materials in the modern field of catalysis, energy storage/conversion, and environments. In past decades, breakthroughs have been made in preparing carbon materials, such as fullerenes, carbon nanotubes, and graphene. Meanwhile, the carbon materials with high surface areas, tunable pore size, heteroatom doping, and controlled morphologies also can promote their application performances in heterogeneous catalysis, drug encapsulation, electrode, and photonic devices. Hypercrosslinked polymers (HCPs) generally have high surface areas versatile synthetic routes, well-defined chemical-physical stability, and have emerged as excellent candidates for carbon precursors. More and more green and sustainable chemical synthetic methodologies have become possible to directly control particle size, surface area, chemical composition, and morphologies of carbons from the carbonization of HCPs. This graphical review demonstrates current approaches toward the synthesis of HCPs as carbon precursors following green and sustainable principles. And we also discussed the challenges and future directions of green HCPs production as carbon resources.
    Keywords Carbon ; Hypercrosslinked polymers ; Green synthesis ; Sustainable ; Self-assembly ; Chemistry ; QD1-999
    Subject code 333
    Language English
    Publishing date 2022-01-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Piezoelectric Enhancement of Piezoceramic Nanoparticle-Doped PVDF/PCL Core-Sheath Fibers

    Zhangbin Feng / Ke Wang / Yukang Liu / Biao Han / Deng-Guang Yu

    Nanomaterials, Vol 13, Iss 1243, p

    2023  Volume 1243

    Abstract: Electrospinning is considered to be an efficient method to prepare piezoelectric thin films because of its ability to transform the phase of the polymers. A core-sheath structure can endow fibers with more functions and properties. In this study, fibers ... ...

    Abstract Electrospinning is considered to be an efficient method to prepare piezoelectric thin films because of its ability to transform the phase of the polymers. A core-sheath structure can endow fibers with more functions and properties. In this study, fibers with a core-sheath structure were prepared using polyvinylidene fluoride (PVDF) included with nanoparticles (NPs) as the shell layer and polycaprolactone (PCL) as the core layer. Their mechanical and piezoelectric properties were studied in detail. During the course of the electrospinning process, PVDF was demonstrated to increase the amount of its polar phase, with the help of nanoparticles acting as a nucleating agent to facilitate the change. PCL was chosen as a core material because of its good mechanical properties and its compatibility with PVDF. Transmission electron microscope (TEM) assessments revealed that the fibers have a core-sheath structure, and shell layers were loaded with nanoparticles. Mechanical testing showed that the core layer can significantly improve mechanical properties. The XRD patterns of the core-sheath structure fibers indicated the β phase domain the main component. Piezoelectric testing showed that the doped nanoparticles were able to enhance piezoelectric performances. The increases of mechanical and piezoelectric properties of core-sheath structure fibers provide a feasible application for wearable electronics, which require flexibility and good mechanical properties.
    Keywords coaxial electrospinning ; core-sheath fibers ; piezoelectric coefficient ; piezoelectric nanoparticles ; Chemistry ; QD1-999
    Subject code 620
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Electrospinning spinneret

    Wenliang Song / Yunxin Tang / Cheng Qian / Bumjoon J. Kim / Yaozu Liao / Deng-Guang Yu

    The Innovation, Vol 4, Iss 2, Pp 100381- (2023)

    A bridge between the visible world and the invisible nanostructures

    2023  

    Keywords Science (General) ; Q1-390
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher Elsevier
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Hybrid Films Prepared from a Combination of Electrospinning and Casting for Offering a Dual-Phase Drug Release

    Haoran Liu / Wenlai Jiang / Zili Yang / Xiren Chen / Deng-Guang Yu / Jun Shao

    Polymers, Vol 14, Iss 2132, p

    2022  Volume 2132

    Abstract: One of the most important trends in developments in electrospinning is to combine itself with traditional materials production and transformation methods to take advantage of the unique properties of nanofibers. In this research, the single-fluid ... ...

    Abstract One of the most important trends in developments in electrospinning is to combine itself with traditional materials production and transformation methods to take advantage of the unique properties of nanofibers. In this research, the single-fluid blending electrospinning process was combined with the casting film method to fabricate a medicated double-layer hybrid to provide a dual-phase drug controlled release profile, with ibuprofen (IBU) as a common model of a poorly water-soluble drug and ethyl cellulose (EC) and polyvinylpyrrolidone (PVP) K60 as the polymeric excipients. Electrospun medicated IBU-PVP nanofibers (F7), casting IBU-EC films (F8) and the double-layer hybrid films (DHFs, F9) with one layer of electrospun nanofibers containing IBU and PVP and the other layer of casting films containing IBU, EC and PVP, were prepared successfully. The SEM assessments demonstrated that F7 were in linear morphologies without beads or spindles, F8 were solid films, and F9 were composed of one porous fibrous layer and one solid layer. XRD and FTIR results verified that both EC and PVP were compatible with IBU. In vitro dissolution tests indicated that F7 were able to provide a pulsatile IBU release, F8 offered a typical drug sustained release, whereas F9 were able to exhibit a dual-phase controlled release with 40.3 ± 5.1% in the first phase for a pulsatile manner and the residues were released in an extended manner in the second phase. The DHFs from a combination of electrospinning and the casting method pave a new way for developing novel functional materials.
    Keywords electrospinning ; casting ; hybrid films ; dual-phase release ; nanofibers ; Organic chemistry ; QD241-441
    Subject code 660 ; 620
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Electrospun Nanofiber Membranes for Air Filtration

    Yangjian Zhou / Yanan Liu / Mingxin Zhang / Zhangbin Feng / Deng-Guang Yu / Ke Wang

    Nanomaterials, Vol 12, Iss 1077, p

    A Review

    2022  Volume 1077

    Abstract: Nanomaterials for air filtration have been studied by researchers for decades. Owing to the advantages of high porosity, small pore size, and good connectivity, nanofiber membranes prepared by electrospinning technology have been considered as an ... ...

    Abstract Nanomaterials for air filtration have been studied by researchers for decades. Owing to the advantages of high porosity, small pore size, and good connectivity, nanofiber membranes prepared by electrospinning technology have been considered as an outstanding air-filter candidate. To satisfy the requirements of material functionalization, electrospinning can provide a simple and efficient one-step process to fabricate the complex structures of functional nanofibers such as core–sheath structures, Janus structures, and other multilayered structures. Additionally, as a nanoparticle carrier, electrospun nanofibers can easily achieve antibacterial properties, flame-retardant properties, and the adsorption properties of volatile gases, etc. These simple and effective approaches have benefited from the significate development of electrospun nanofibers for air-filtration applications. In this review, the research progress on electrospun nanofibers as air filters in recent years is summarized. The fabrication methods, filtration performances, advantages, and disadvantages of single-polymer nanofibers, multipolymer composite nanofibers, and nanoparticle-doped hybrid nanofibers are investigated. Finally, the basic principles of air filtration are concluded upon and prospects for the application of complex-structured nanofibers in the field of air filtration are proposed.
    Keywords electrospinning ; nanofiber ; particulate matter ; polymer ; nanostructure ; Chemistry ; QD1-999
    Subject code 690
    Language English
    Publishing date 2022-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Electrospun Core (HPMC–Acetaminophen)–Shell (PVP–Sucralose) Nanohybrids for Rapid Drug Delivery

    Xinkuan Liu / Mingxin Zhang / Wenliang Song / Yu Zhang / Deng-Guang Yu / Yanbo Liu

    Gels, Vol 8, Iss 357, p

    2022  Volume 357

    Abstract: The gels of cellulose and its derivatives have a broad and deep application in pharmaceutics; however, limited attention has been paid to the influences of other additives on the gelation processes and their functional performances. In this study, a new ... ...

    Abstract The gels of cellulose and its derivatives have a broad and deep application in pharmaceutics; however, limited attention has been paid to the influences of other additives on the gelation processes and their functional performances. In this study, a new type of electrospun core–shell nanohybrid was fabricated using modified, coaxial electrospinning which contained composites of hydroxypropyl methyl cellulose (HPMC) and acetaminophen (AAP) in the core sections and composites of PVP and sucralose in the shell sections. A series of characterizations demonstrated that the core–shell hybrids had linear morphology with clear core–shell nanostructures, and AAP and sucralose distributed in the core and shell section in an amorphous state separately due to favorable secondary interactions such as hydrogen bonding. Compared with the electrospun HPMC–AAP nanocomposites from single-fluid electrospinning of the core fluid, the core–shell nanohybrids were able to promote the water absorbance and HMPC gelation formation processes, which, in turn, ensured a faster release of AAP for potential orodispersible drug delivery applications. The mechanisms of the drug released from these nanofibers were demonstrated to be a combination of erosion and diffusion mechanisms. The presented protocols pave a way to adjust the properties of electrospun, cellulose-based, fibrous gels for better functional applications.
    Keywords HPMC ; coaxial electrospinning ; core–shell nanohybrids ; orodispersible drug delivery ; fast dissolution ; poorly water-soluble drug ; Science ; Q ; Chemistry ; QD1-999 ; Inorganic chemistry ; QD146-197 ; General. Including alchemy ; QD1-65
    Language English
    Publishing date 2022-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Electrospun nanofiber-based glucose sensors for glucose detection

    Yutong Du / Xinyi Zhang / Ping Liu / Deng-Guang Yu / Ruiliang Ge

    Frontiers in Chemistry, Vol

    2022  Volume 10

    Abstract: Diabetes is a chronic, systemic metabolic disease that leads to multiple complications, even death. Meanwhile, the number of people with diabetes worldwide is increasing year by year. Sensors play an important role in the development of biomedical ... ...

    Abstract Diabetes is a chronic, systemic metabolic disease that leads to multiple complications, even death. Meanwhile, the number of people with diabetes worldwide is increasing year by year. Sensors play an important role in the development of biomedical devices. The development of efficient, stable, and inexpensive glucose sensors for the continuous monitoring of blood glucose levels has received widespread attention because they can provide reliable data for diabetes prevention and diagnosis. Electrospun nanofibers are new kinds of functional nanocomposites that show incredible capabilities for high-level biosensing. This article reviews glucose sensors based on electrospun nanofibers. The principles of the glucose sensor, the types of glucose measurement, and the glucose detection methods are briefly discussed. The principle of electrospinning and its applications and advantages in glucose sensors are then introduced. This article provides a comprehensive summary of the applications and advantages of polymers and nanomaterials in electrospun nanofiber-based glucose sensors. The relevant applications and comparisons of enzymatic and non-enzymatic nanofiber-based glucose sensors are discussed in detail. The main advantages and disadvantages of glucose sensors based on electrospun nanofibers are evaluated, and some solutions are proposed. Finally, potential commercial development and improved methods for glucose sensors based on electrospinning nanofibers are discussed.
    Keywords glucose detection ; nanomaterial ; enzymatic biosensor ; non-enzymatic sensor ; electrospun nanofibers ; Chemistry ; QD1-999
    Subject code 670
    Language English
    Publishing date 2022-08-01T00:00:00Z
    Publisher Frontiers Media S.A.
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Electrospun Structural Hybrids of Acyclovir-Polyacrylonitrile at Acyclovir for Modifying Drug Release

    He Lv / Shiri Guo / Gaoyi Zhang / Wanli He / Yonghui Wu / Deng-Guang Yu

    Polymers, Vol 13, Iss 4286, p

    2021  Volume 4286

    Abstract: In traditional pharmaceutics, drug–crystalline nanoparticles and drug–polymer composites are frequently explored for their ability to modify drug release profiles. In this study, a novel sort of hybrid with a coating of acyclovir crystalline ... ...

    Abstract In traditional pharmaceutics, drug–crystalline nanoparticles and drug–polymer composites are frequently explored for their ability to modify drug release profiles. In this study, a novel sort of hybrid with a coating of acyclovir crystalline nanoparticles on acyclovir-polyacrylonitrile composites was fabricated using modified, coaxial electrospinning processes. The developed acyclovir-polyacrylonitrile at the acyclovir nanohybrids was loaded with various amounts of acyclovir, which could be realized simply by adjusting the sheath fluid flow rates. Compared with the electrospun composite nanofibers from a single-fluid blending process, the nanohybrids showed advantages of modifying the acyclovir release profiles in the following aspects: (1) the initial release amount was more accurately and intentionally controlled; (2) the later sustained release was nearer to a zero-order kinetic process; and (3) the release amounts at different stages could be easily allocated by the sheath fluid flow rate. X-ray diffraction results verified that the acyclovir nanoparticles were in a crystalline state, and Fourier-transform infrared spectra verified that the drug acyclovir and the polymer polyacrylonitrile had a good compatibility. The protocols reported here could pave the way for developing new types of functional nanostructures.
    Keywords coaxial electrospinning ; structural hybrids ; polymeric nanocomposites ; modified release ; medicated nanomaterials ; Organic chemistry ; QD241-441
    Subject code 660
    Language English
    Publishing date 2021-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article ; Online: Electrospun Functional Nanofiber Membrane for Antibiotic Removal in Water

    Kun Zhao / Shi-Xiong Kang / Yao-Yao Yang / Deng-Guang Yu

    Polymers, Vol 13, Iss 2, p

    Review

    2021  Volume 226

    Abstract: As a new kind of water pollutant, antibiotics have encouraged researchers to develop new treatment technologies. Electrospun fiber membrane shows excellent benefits in antibiotic removal in water due to its advantages of large specific surface area, high ...

    Abstract As a new kind of water pollutant, antibiotics have encouraged researchers to develop new treatment technologies. Electrospun fiber membrane shows excellent benefits in antibiotic removal in water due to its advantages of large specific surface area, high porosity, good connectivity, easy surface modification and new functions. This review introduces the four aspects of electrospinning technology, namely, initial development history, working principle, influencing factors and process types. The preparation technologies of electrospun functional fiber membranes are then summarized. Finally, recent studies about antibiotic removal by electrospun functional fiber membrane are reviewed from three aspects, namely, adsorption, photocatalysis and biodegradation. Future research demand is also recommended.
    Keywords electrospinning ; electrospun functional fiber membrane ; antibiotics ; adsorption ; photocatalysis ; biodegradation ; Organic chemistry ; QD241-441
    Language English
    Publishing date 2021-01-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Electrospun Hybrid Films for Fast and Convenient Delivery of Active Herb Extracts

    Shiri Guo / Wenlai Jiang / Liangfei Shen / Gaoyi Zhang / Yiman Gao / Yaoyao Yang / Deng-Guang Yu

    Membranes, Vol 12, Iss 4, p

    2022  Volume 398

    Abstract: Herb medicines are popular for safe application due to being a source of natural herbs. However, how to deliver them in an efficacious and convenient manner poses a big challenge to researchers. In this study, a new concept is demonstrated that the ... ...

    Abstract Herb medicines are popular for safe application due to being a source of natural herbs. However, how to deliver them in an efficacious and convenient manner poses a big challenge to researchers. In this study, a new concept is demonstrated that the electrospun polymer-based hybrid films can be a platform for promoting the delivery of a mixture of active herb extract, i.e., Lianhua Qingwen Keli (LQK), also a commercial traditional Chinese patent medicine. The LQK can be co-dissolved with the filament-forming polymeric polyvinylpyrrolidone K60 and a sweeter sucralose to prepare an electrospinnable solution. A handheld electrospinning apparatus was explored to transfer the solution into solid nanofibers, i.e., the LQK-loaded medicated films. These films were demonstrated to be composed of linear nanofibers. A puncher was utilized to transfer the mat into circular membrane a diameter of 15 mm. Two self-created methods were developed for disclosing the dissolution performances of the electrospun mats. Both the water droplet experiments and the wet paper (mimic tongue) experiments verified that the hybrid films can rapidly disintegrate when they encounter water and release the loaded LQK in an immediate manner. Based on the reasonable selections of polymeric excipients, the present protocols pave a way for delivering many types of active herb extracts in an effective and convenient manner.
    Keywords medicated film ; hybrid film ; herb medicine ; electrospinning ; drug delivery ; fast dissolution ; Chemical technology ; TP1-1185 ; Chemical engineering ; TP155-156
    Subject code 620
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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