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https://www.readbyqxmd.com/read/29793074/cross-linked-electrospun-cartilage-acellular-matrix-poly-caprolactone-co-lactide-co-glycolide-nanofiber-as-an-antiadhesive-barrier
#1
Jin Woo Lee, Joon Yeong Park, Seung Hun Park, Min Ju Kim, Bo Ram Song, Hee-Woong Yun, Tae Woong Kang, Hak Soo Choi, Young Jick Kim, Byoung Hyun Min, Moon Suk Kim
In this work, we chose cartilage acellular matrix (CAM) as a promising antiadhesive material because CAM effectively inhibits the formation of blood vessels, and we used electrospinning to prepare antiadhesive barriers. Additionally, we synthesized N-hydroxysuccinimide (NHS)-poly(caprolactone-co-lactide-co-glycolide)-NHS (MP) copolymers (to tune degradation) as a cross-linking agent for CAM. This is the first report on the development of electrospun cross-linked (Cx) CAM/MP (CA/P) nanofiber (NF) (Cx-CA/P-NF) with a tunable degradation period as an antiadhesive barrier...
May 21, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29792328/transforming-nanofibers-to-woven-nanotextiles-for-vascular-application
#2
John Joseph, Aarya G Krishnan, Aleena M Cherian, Balasubramoniam K Rajagopalan, Rajesh Jose, Praveen Varma, Vijayakumar Maniyal, Sivanarayanan Balakrishnan, Shantikumar V Nair, Deepthy Menon
This study investigated the unique properties, fabrication technique and vascular applications of woven nanotextiles made from low strength nanoyarns, which are bundles of thousands of nanofibers. An innovative robotic system was developed to meticulously interweave nanoyarns in longitudinal and transverse directions, resulting in a flexible, but strong woven product. This is the only technique for producing seamless nanotextiles in tubular form from nanofibers. The porosity and mechanical properties of nanotextiles could be substantially tuned by altering the number of nanoyarns per unit area...
May 24, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29792027/fast-and-ultrasensitive-detection-of-a-nerve-agent-simulant-using-carbazole-based-nanofibers-with-amplified-ratiometric-fluorescence-responses
#3
Chunyan Sun, Wei Xiong, Wei Dong Ye, Yingxuan Zheng, Ran Duan, Yanke Che, Jincai Zhao
In this work, we report the fast and ultrasensitive detection of a nerve agent simulant in the gas phase, diethyl chloro-phosphate (DCP), by using carbazole-based nanofibers from 1. When exposed to trace DCP, the formed pyridine-phosphorylated product in 1 nanofibers can cause amplified ratiometric fluorescence responses, i.e., amplified fluores-cence quenching via quenching excitons within the diffusion length of 1 nanofibers and simultaneously amplified turn-on fluorescence responses via harvesting excitons within the diffusion length to give the intramolecular charge transfer (ICT) emission at a longer wavelength...
May 24, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29791874/fabrication-of-electrospun-poly-vinyl-alcohol-dextran-nanofibers-via-emulsion-process-as-drug-delivery-system-kinetics-and-in-vitro-release-study
#4
A Meera Moydeen, M Syed Ali Padusha, Eman F Aboelfetoh, Salem S Al-Deyab, Mohamed H El-Newehy
A green method was used for the fabrication of coaxial nanofibers for use in biomedical applications. Coaxial nanofiber mats were fabricated by emulsion electrospinning from poly(vinyl alcohol) (PVA) and Dextran sulfate (Dex) blends loaded with ciprofloxacin (Cipro) as a model drug dissolved in edible oil. The ratio of the PVA/Dex mixture was optimized and nanofibers were stabilized against disintegration in water by thermal treatment at 120 °C. The morphology of the prepared nanofibers was observed by scanning electron microscopy and the structure of the core-shell nanofibers was confirmed by transmission electron microscopy...
May 20, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29791128/donor-acceptor-supramolecular-organic-nanofibers-as-visible-light-photoelectrocatalysts-for-hydrogen-production
#5
Liping Yang, Maomao Wang, Paul M Slattum, Benjamin R Bunes, Yuanhao Wang, Chuanyi Wang, Ling Zang
Perylene tetracarboxylic diimide (PTCDI) derivatives have been extensively studied for one-dimensional self-assembled systems and for applications in photocatalysis. Herein, we constructed a PTCDI-based donor-acceptor (D-A) supramolecular system via in situ self-assembly on an indium tin oxide (ITO) conductive glass surface. The self-assembled PTCDI nanostructures exhibit well-defined nanofibril morphologies and strong photocurrents. Interestingly, a strong and reversible electrochromic color change was observed during cyclic voltammetry (CV)...
May 23, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29790610/highly-luminescent-dual-mode-polymeric-nanofibers-based-flexible-mat-for-white-security-paper-and-encrypted-nanotaggants-applications
#6
Bipin Kumar Gupta, Amit Kumar Gangwar, Ashish Gupta, Garima Kedawat, Pawan Kumar, Bhanu Pratap Singh, Nidhi Singh, Avanish K Srivastava, Sanjay R Dhakate
Recently, increasing trend of counterfeiting of the important data, currency, stamp papers, branded products etc. has become a major security threat which could lead to a serious damage to global economy. Consequences of these damages are enforcing to researcher for developing new high-end security features to address its full proof solutions. Herein, we report a dual mode flexible highly luminescent white security paper and nanotaggants composed of nanophosphors incorporated in polymer metrics to form the nanofibers based mat for anti-counterfeiting applications...
May 23, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29790330/sub-ppm-h2s-colorimetric-sensor-lead-acetate-anchored-nanofibers-toward-halitosis-diagnosis
#7
Jun-Hwe Cha, Dong-Ha Kim, Seon-Jin Choi, Won-Tae Koo, Il-Doo Kim
Lead(II) acetate (Pb(Ac)2) reacts with hydrogen sulfide to form colored brownish precipitates of lead sulfide. Thus far, in order to detect leakage of H2S gas in industrial sectors, Pb(Ac)2 has been used as an indicator in the form of test papers with a detection limit only as low as 5 ppm. Diagnosis of halitosis by exhaled breath needs sensors able to detect down to 1 ppm of H2S gas. In this work, high surface area and porous Pb(Ac)2 anchored nanofibers (NFs) that overcome limitations of conventional Pb(Ac)2 based H2S sensor are successfully achieved...
May 23, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29789633/3d-interconnected-binder-free-electrospun-mno-c-nanofibers-for-supercapacitor-devices
#8
Mohamed Ramadan, Ahmed M Abdellah, Saad G Mohamed, Nageh K Allam
Rational design of binder-free materials with high cyclic stability and high conductivity is a great need for high performance supercapacitors. We demonstrate a facile one-step synthesis method of binder-free MnO@C nanofibers as electrodes for supercapacitor applications. The topology of the fabricated nanofibers was investigated using FESEM and HRTEM. The X-ray photoelectron spectroscopy (XPS) and the X-ray diffraction (XRD) analyses confirm the formation of the MnO structure. The electrospun MnO@C electrodes achieve high specific capacitance of 578 F/g at 1 A/g with an outstanding cycling performance...
May 22, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29786920/functional-carbon-nanofibers-with-semi-embedded-titanium-oxide-particles-via-electrospinning
#9
Guoqing Chang, Wajid Ullah, Yunfeng Hu, Liwei Lin, Xu Wang, Chang-Zhi Li
The formulation of optoelectronic components into 1D nanostructures allows the promotion of new materials with multifunctionalities. In this work, it is demonstrated that new synthesis of photocatalytic carbon nanofiber decorated with semi-embedded titanium oxide (TiO2 ), namely, TiO2 @carbon fiber, is conveniently accessed through the electrospinning of polyacrylonitrile polymer and TiO2 particle comixture, and then followed by photon-activated self-erosion to expose the embedded TiO2 and carbonization. The hybrid nanofibers are characterized by field emission scanning electron microscopy, transmission electron microscopy, and X-ray diffraction analysis...
May 22, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29786730/dimensional-control-of-supramolecular-assemblies-of-diacetylene-derived-peptide-gemini-amphiphile-from-spherical-micelles-to-foamlike-networks
#10
Hao Jiang, Martin Ehlers, Xiao-Yu Hu, Elio Zellermann, Carsten Schmuck
Peptide amphiphiles capable of assembling into multidimensional nanostructures have attracted much attention over the past decade due to their potential applications in materials science. Herein, a novel diacetylene-derived peptide gemini amphiphile with a fluorenylmethyloxycarbonyl (Fmoc) group at the N-terminus is reported to hierarchically assemble into spherical micelles, one-dimensional nanorods, two-dimensional foamlike networks and lamellae. Solvent polarity shows a remarkable effect on the self-assembled structures by changing the balance of four weak noncovalent interactions (hydrogen-bonding, π-π stacking, hydrophobic interaction, and electrostatic repulsion)...
May 22, 2018: Soft Matter
https://www.readbyqxmd.com/read/29784327/4-mercaptophenylboronic-acid-modified-spirally-curved-mesoporous-silica-nanofibers-coupled-with-ultra-performance-liquid-chromatography-mass-spectrometry-for-determination-of-brassinosteroids-in-plants
#11
Miao Chen, Ranhao Wang, Yuqiu Zhu, Minzhuo Liu, Fawei Zhu, Jianbo Xiao, Xiaoqing Chen
Herein, for the first time, thiol-functionalized mesoporous silica (mSiO2 -SH) nanofibers with a spirally-curved twisted hexagonal morphology were synthesized via a simple one-pot protocol. 4-Mercaptophenylboronic acids (4-MPBA) were attached onto the mSiO2 -SH nanofibers via disulfide bond, serving as boronate affinity sorbent to selectively capture brassinosteroids (BRs) from plant extract. The resulting BRs-MPBA derivatives were easily eluted from the sorbent by cleaving the disulfide bond, which was subsequently subjected to ultra performance liquid chromatography-mass spectrometry (UPLC-MS) analysis...
October 15, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29783766/finite-element-analysis-of-electrospun-nanofibrous-mats-under-biaxial-tension
#12
Yunlei Yin, Jie Xiong
Due to the non-uniform material properties of electrospun nanofibrous mats and the non-linear characteristics of single fibers, establishing a numerical model that can fully explain these features and correctly describe their properties is difficult. Based on the microstructure of electrospun nanofibrous mats, two macroscopic continuum finite element (FE) models with a uniform or oriented nanofiber distribution were established to describe the mechanical behavior of nanofibrous mats under biaxial tension. The FE models were verified by biaxial tension experiments on silk fibroin/polycaprolactone nanofibrous mats...
May 19, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29783681/encapsulation-and-characterization-of-gentamicin-sulfate-in-the-collagen-added-electrospun-nanofibers-for-skin-regeneration
#13
Wan Khartini Wan Abdul Khodir, Abdul Hakim Abdul Razak, Min Hwei Ng, Vincenzo Guarino, Deny Susanti
In the current practice, the clinical use of conventional skin substitutes such as autogenous skin grafts have shown several problems, mainly with respect to limited sources and donor site morbidity. In order to overcome these limitations, the use of smart synthetic biomaterials is tremendously diffusing as skin substitutes. Indeed, engineered skin grafts or analogues frequently play an important role in the treatment of chronic skin wounds, by supporting the regeneration of newly formed tissue, and at the same time preventing infections during the long-term treatment...
May 18, 2018: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/29783082/multiplexed-aptasensor-based-on-metal-ions-labels-for-simultaneous-detection-of-multiple-antibiotic-residues-in-milk
#14
Falan Li, Yemin Guo, Xiangyou Wang, Xia Sun
A dual-target electrochemical aptasensor was developed for the simultaneous detection of multiple antibiotics based on metal ions as signal tracers and nanocomposites as signal amplification strategy. Metal ions such as Cd2+ and Pb2+ could generate distinct differential pulse voltammetry (DPV) peaks. When targets were present, kanamycin (KAN) and streptomycin (STR) as models, the KAN aptamer (KAP) and STR aptamer (STP) were released from their complementary strands, with more change of Cd2+ and Pb2+ corresponding to peak currents...
April 13, 2018: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29782141/in-situ-assembly-of-well-dispersed-ag-nanoparticles-throughout-electrospun-alginate-nanofibers-for-monitoring-human-breath-smart-fabrics
#15
Jun Zhang, Xiao-Xiong Wang, Bin Zhang, Seeram Ramakrishna, Miao Yu, Jian-Wei Ma, Yun-Ze Long
Alginate nanofibers assembled with sliver nanoparticles throughout the whole nanofiber were fabricated by three steps including electrospinning of Na-alginate nanofibers, ion exchange between the sodium and silver ions, and in situ reduction of silver nanoparticles. The content, distribution and size of the nanoparticles are controllable by tuning reaction conditions. Ag/alginate nanofibers exhibit good humidity sensitivity in a wide humidity range from ambient RH (20%) to 85% RH. Interestingly, these humidity sensors can be attached to a 3M-9001V mask for monitoring human breath during exercise and emotion changes, and this smart exhibits accurate and continuous human-breath tracking no matter how fast or slow as well as how deep or shallow...
May 21, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29780493/impact-of-helical-organization-on-the-photovoltaic-properties-of-oligothiophene-supramolecular-polymers
#16
Hayato Ouchi, Takahiro Kizaki, Masaki Yamato, Xu Lin, Nagahiro Hoshi, Fabien Silly, Takashi Kajitani, Takanori Fukushima, Ken-Ichi Nakayama, Shiki Yagai
Helical self-assembly of functional π-conjugated molecules offers unique photochemical and electronic properties in the spectroscopic level, but there are only a few examples that demonstrate their positive impact on the optoelectronic device level. Here, we demonstrate that hydrogen-bonded tapelike supramolecular polymers of a barbiturated oligo(alkylthiophene) show notable improvement in their photovoltaic properties upon organizing into helical nanofibers. A tapelike hydrogen-bonded supramolecular array of barbiturated oligo(butylthiophene) molecules was directly visualized by STM at a liquid-solid interface...
April 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29777810/bacterial-cellulose-nanofibers-as-reinforce-in-edible-fish-myofibrillar-protein-nanocomposite-films
#17
Bahareh Shabanpour, Mohsen Kazemi, Seyed Mahdi Ojagh, Parastoo Pourashouri
Bacterial cellulose nanofibers (BCNF) were employed in order to improve various properties of fish myofibrillar protein (FMP) films of Silver carp. Three different levels (2, 4 and 6%, w/w) of the nanoparticles were added to the protein polymer substrate. In this regard, it became clear that 6% BCNF-containing nanocomposites had the highest tensile strength, which was about 49% better than control samples. The nanoparticles had positive impact on the physical properties; BCNF-containing films showed a reduction in water vapor permeability, swelling and solubility indexes...
May 16, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29775400/evaluating-the-cytotoxicity-of-tin-dioxide-nanofibers
#18
Ashley S Reynolds, Tanya H Pierre, Rebecca McCall, Ji Wu, Worlanyo E Gato
Tin dioxide nanofibers (SnDNFs) are small fibers that have many applications. Tin dioxide nanofibers can be used in cosmetics, solar cells, toxic gas release sensors, and air pollution control. To date there have been few studies on the cytotoxicity of SnDNFs. The goal of this research is to determine if electrospun SnDNFs are toxic in a lung cancer cell line (A549). Considering the nano-scale size of the fibers, they can easily be inhaled and enter the pulmonary system and cause toxic effects in the lung. Occupational exposure to SnDNFs has been linked to pulmonary disease, making the A549 cell line important in this study...
May 18, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29774920/the-design-and-fabrication-of-supramolecular-semiconductor-nanowires-formed-by-benzothienobenzothiophene-btbt-conjugated-peptides
#19
Mohammad Aref Khalily, Hakan Usta, Mehmet Ozdemir, Gokhan Bakan, F Begum Dikecoglu, Charlotte Edwards-Gayle, Jessica A Hutchinson, Ian W Hamley, Aykutlu Dana, Mustafa O Guler
π-Conjugated small molecules based on a [1]benzothieno[3,2-b]benzothiophene (BTBT) unit are of great research interest in the development of solution-processable semiconducting materials owing to their excellent charge-transport characteristics. However, the BTBT π-core has yet to be demonstrated in the form of electro-active one-dimensional (1D) nanowires that are self-assembled in aqueous media for potential use in bioelectronics and tissue engineering. Here we report the design, synthesis, and self-assembly of benzothienobenzothiophene (BTBT)-peptide conjugates, the BTBT-peptide (BTBT-C3-COHN-Ahx-VVAGKK-Am) and the C8-BTBT-peptide (C8-BTBT-C3-COHN-Ahx-VVAGKK-Am), as β-sheet forming amphiphilic molecules, which self-assemble into highly uniform nanofibers in water with diameters of 11-13(±1) nm and micron-size lengths...
May 18, 2018: Nanoscale
https://www.readbyqxmd.com/read/29774917/uniform-li-deposition-regulated-via-three-dimensional-polyvinyl-alcohol-nanofiber-networks-for-effective-li-metal-anodes
#20
Gang Wang, Xunhui Xiong, Zhihua Lin, Jie Zheng, Zheng Fenghua, Youpeng Li, Yanzhen Liu, Chenghao Yang, Yiwei Tang, Meilin Liu
Lithium metal anodes are considered to be the most promising anode material for next-generation advanced energy storage devices due to their high reversible capacity and extremely low anode potential. Nevertheless, the formation of dendritic Li, induced by the repeated breaking and repairing of solid electrolyte interphase layers, always causes poor cycling performance and low coulombic efficiency, as well as serious safety problems, which have hindered the practical application of Li anodes for a long time...
May 18, 2018: Nanoscale
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