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hollow fibers

Nithin Kuruba, Tao Lu
We present a bi-conical optical directional coupler composed of solid and hollow core fibers. Through an evanescent wave coupling mechanism, the detection of liquid refractive index and its temperature are demonstrated. The experimental results illustrated that the sensor offers a sensitivity of 4.03 ± 0.50 volts per refractive index units (V/RIU) for refractive indices ranging from 1.331 ± 0.003 to 1.403 ± 0.003 with a resolution of 3.5 × 10 - 3 refractive index units (RIU).
February 16, 2019: Sensors
Kevin Roberts, John Taehwan Kim, Shelby White, Jamie Hestekin, Jeffrey C Wolchok
Engineered scaffolds derived from extracellular matrix (ECM) have driven significant interest in medicine for their potential in expediting wound closure and healing. Extraction of extracellular matrix from fibrogenic cell cultures in vitro has potential for generation of ECM from human- and potentially patient-specific cell lines, minimizing the presence of xenogeneic epitopes which has hindered the clinical success of some existing ECM products. A significant challenge in in vitro production of ECM suitable for implantation is that ECM production by cell culture is typically of relatively low yield...
February 2, 2019: Journal of Visualized Experiments: JoVE
Bamdad Riahi-Zanjani, Mahdi Balali-Mood, Ahmad Asoodeh, Zarrin Es'haghi, Adel Ghorani-Azam
The ability of extraction and preconcentration of small quantities of substances from biological samples is important in analytical sciences, particularly forensic medicine. In the present study, we evaluated the binding potential of amino acids to produce a new solid phase microextraction fiber based on carbon nanotube (CNTs) for extraction and preconcentration of small amount of morphine in urine sample. Raw CNTs were first carboxylated and then functionalized with 3 amino acids including glutamate, arginine, and cysteine...
May 15, 2019: Talanta
Wenxiao Gai, Die Ling Zhao, Tai-Shung Chung
We have incorporated Na+ -functionalized carbon quantum dots (Na-CQDs) into the polyamide layer via interfacial polymerization reaction and developed novel thin film nanocomposite (TFN) hollow fiber membranes for brackish water desalination. Comparing with the conventional thin film composite (TFC) membranes, the TFN membranes comprising Na-CQDs have a larger effective surface area, thinner polyamide layer and more hydrophilic oxygen-containing groups in the polyamide layer. Besides, the interstitial space among the polyamide chains becomes larger due to the presence of Na-CQDs...
February 4, 2019: Water Research
Aichen Ge, Fanchao Meng, Yanfeng Li, Bowen Liu, Minglie Hu
Negative curvature hollow-core fibers (NC-HCFs) are useful as gas sensors. We numerically analyze the single-mode performance of NC-HCFs. Both single-ring NC-HCFs and nested antiresonant fibers (NANFs) are investigated. When the size of the cladding tubes is properly designed, higher-order modes (HOMs) in the fiber core can be coupled with the cladding modes effectively and form high-loss supermodes. For the single-ring structure, we propose a novel NC-HCF with hybrid cladding tubes to enable suppression of the first two HOMs in the core simultaneously...
February 15, 2019: Micromachines
Chia-Hsuan Tseng, Wan-Ting Huang, Chee Ho Chew, Jun-Kai Lai, Shih-Hsin Tu, Po-Li Wei, Kang-Yun Lee, Gi-Ming Lai, Chien-Chung Chen
The advent of personalized cancer treatment resulted in the shift from the administration of cytotoxic drugs with broad activity spectrum to a targeted tumor-specific therapy. Aligned to this development, the focus of this study revolved around the application of our novel and patented microtube array membrane (MTAM) in the US National Cancer Institute (NCI) developed an HFA (hollow fiber assay) assay; hereinafter known as MTAM/HFA. Electrospun poly-L-lactic acid (PLLA) MTAM was sterilized and loaded with cell lines/patient derived tumor cells (PDTC) and subcutaneously implanted into the backs of BALB/C mice...
February 14, 2019: Materials
Alessandro Crosio, Benedetta Elena Fornasari, Giovanna Gambarotta, Stefano Geuna, Stefania Raimondo, Bruno Battiston, Pierluigi Tos, Giulia Ronchi
Nerve regeneration after delayed nerve repair is often unsuccessful. Indeed, the expression of genes associated with regeneration, including neurotrophic and gliotrophic factors, is drastically reduced in the distal stump of chronically transected nerves; moreover, Schwann cells undergo atrophy, losing their ability to sustain regeneration. In the present study, to provide a three-dimensional environment and trophic factors supporting Schwann cell activity and axon re-growth, we combined the use of an effective conduit (a chitosan tube) with a promising intraluminal structure (fresh longitudinal skeletal muscle fibers)...
June 2019: Neural Regeneration Research
Tengteng Wu, Peipei Li, Huanbo Wang, Runbo Zhao, Qiang Zhou, Wenhan Kong, Meiling Liu, Youyu Zhang, Xuping Sun, Feng Frank Gong
Electrocatalytic N2 reduction as an alternative approach to the energy-intensive and large CO2-producing Haber-Bosch process for NH3 synthesis under mild conditions has attracted extensive attention. Current research efforts on N2 reduction have mainly focused on metal-based catalysts, but metal-free alternatives can avoid the issue of metal ion release. In this work, oxygen-doped hollow carbon microtubes (O-KFCNTs) derived from natural kapok fibers are reported as a metal-free NRR electrocatalyst for N2-to-NH3 conversion with excellent selectivity...
February 12, 2019: Chemical Communications: Chem Comm
Mithun Kumar, Arun M Isloor, T Somasekhara Rao, G P Syed Ibrahim, Inamuddin, Norafiqah Ismail, Ahmed Fauzi Ismail, Abdullah M Asiri
Cellulose acetate (CA) and cellulose acetate phthalate (CAP) were used as additives (1 wt%, 3 wt%, and 5 wt%) to prepare polyphenylsulfone (PPSU) hollow fiber membranes. Prepared hollow fiber membranes were characterized by surface morphology using Scanning electron microscopy (SEM), surface roughness by Atomic force microscopy (AFM), the surface charge of the membrane was analyzed by zeta potential measurement, hydrophilicity by contact angle measurement and the functional groups by Fourier transform infrared spectroscopy (FTIR)...
February 6, 2019: International Journal of Biological Macromolecules
Jonas H Osório, Matthieu Chafer, Benoît Debord, Fabio Giovanardi, Martin Cordier, Martin Maurel, Frédéric Delahaye, Foued Amrani, Luca Vincetti, Frédéric Gérôme, Fetah Benabid
Understanding cladding properties is crucial for designing microstructured optical fibers. This is particularly acute for Inhibited-Coupling guiding fibers because of the reliance of their core guidance on the core and cladding mode-field overlap integral. Consequently, careful planning of the fiber cladding parameters allows obtaining fibers with optimized characteristics such as low loss and broad transmission bandwidth. In this manuscript, we report on how one can tailor the modal properties of hollow-core photonic crystal fibers by adequately modifying the fiber cladding...
February 4, 2019: Scientific Reports
Ivan Colorado Cervantes, Vittorio Sansalone, Luciano Teresi
The controversy between passive and active ventricular filling has been debated for decades and the question about the existence of an active diastole remains open. In this work, we advocate the model of active diastole by considering the heart as a suction pump and we add some more clues to support this point of view by the analysis of the pressure-volume (PV) loops of the left heart, comprising of the left ventricle (LV) and atrium (LA). Our working hypothesis is based on the dichotomy motor-brake: the cardiac muscle can act as a motor, when shortening against a load, or as a brake, when lengthening to a load...
February 1, 2019: Journal of Theoretical Biology
Eduard F Valenzuela, Helvécio C Menezes, Zenilda L Cardeal
The extensive use of pesticides promotes environmental contamination, mainly in surface and ground waters. However, they remain at very low concentration and present wide degradation level requiring the use of efficient devices for pesticides passive sampling. In this study, a new in situ passive sampling device was developed for monitoring and estimating time-weighted average (TWA) of pesticides in waters. The device was made with simple, recyclable and cheap materials. The sampling system involves the liquid phase microextraction technique with hollow fiber in two-phases mode...
April 25, 2019: Analytica Chimica Acta
Kateryna Yavir, Łukasz Marcinkowski, Renata Marcinkowska, Jacek Namieśnik, Adam Kloskowski
Ionic liquids with their unique properties found so far numerous analytical applications. Among them ionic liquids immobilized on the surface or within the pores of a solid support were successfully utilized in extraction techniques dedicated to preconcentration of the analytes from food, environmental and biological samples. In this review we focus on comprehensive summarizing of available literature data on the examples of ionic liquid-based hybrid materials implementation in selected analytical extraction techniques, namely solid-phase extraction, solid-phase microextraction, hollow-fiber solid-phase microextraction, stir-bar sorptive extraction and biosensors...
April 25, 2019: Analytica Chimica Acta
Kirti Sankhala, D C Florian Wieland, Joachim Koll, Maryam Radjabian, Clarissa Abetz, Volker Abetz
We investigated the self-assembly of block copolymers during hollow fiber membrane (HFM) fabrication by conducting in situ small angle X-ray scattering (SAXS) and ex situ scanning electron microscopy (SEM) studies. SAXS enables us to follow the structural rearrangements after extrusion at different distances from the spinning nozzle. The kinetics of the spinning process is examined as a function of the composition of block copolymer solutions and the spinning parameters. We studied the influence of the extrusion rate on the block copolymer microdomains and their self-assembly in weakly segregated and ordered solutions...
January 30, 2019: Nanoscale
Rodolfo Martínez-Manuel, Ma Del Rosario Bautista-Morales, Daniel López-Cortés, Carlos A Pineda-Arellano, Mikhail G Shlyagin, Óscar Esteban
We demonstrate a simple multi-point refractometer based on the coherent optical frequency-domain multiplexing technique. As local refractive index sensors, interferometers of different lengths formed between cleaved fiber tips and reference weak reflectors are employed. Referent reflectors were fabricated by splicing into lead SMF-28 fiber a very short section of hollow optical fiber using a standard fiber splicer and a cleaver with an optical microscope. Despite the very simple configuration and manufacturing of the sensor, the refractive index resolution of 6×10-4 was demonstrated during proof-of-concept experiments...
January 20, 2019: Applied Optics
Rafael Venson, Ann-Sophie Korb, Gail Cooper
Over the past three decades, many studies employing hollow-fiber liquid-phase microextraction (HF-LPME) bioanalytical methods have been published. The basic mechanism of extraction relies on the migration of the analytes through a liquid membrane sustained in the pores of the walls of a porous hollow fiber, and from there into an acceptor phase present in the lumen of the fiber. The mass transfer occurs by passive diffusion and it can be enhanced by using a carrier or applying an electrical potential across the phases...
January 17, 2019: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Moutusi De, Tarun Kumar Gangopadhyay, Vinod Kumar Singh
Photonic crystal fiber sensors have potential application in environmental monitoring, industry, biomedicine, food preservation, and many more. These sensors work based on advanced and flexible phototonic crystal fiber (PCF) structures, controlled light propagation for the measurement of amplitude, phase, polarization and wavelength of spectrum, and PCF-incorporated interferometry techniques. In this article various PCF-based physical sensors are summarized with the advancement of time based on reported works...
January 23, 2019: Sensors
Xingru Hu, Chaohai Wang, Rui Luo, Chao Liu, Junwen Qi, Xiuyun Sun, Jinyou Shen, Weiqing Han, Lianjun Wang, Jiansheng Li
Efficient extraction of pollutants with different chemical properties from environmental samples has attracted great attention in the development of analytical chemistry. However, it is still a challenge to develop an appropriate and sensitive adsorbent for determining broad-spectrum analytes. Herein, zeolitic imidazole framework-8 (ZIF-8)-derived double-shelled hollow zinc oxide/carbon (ZnO/C) nanocubes were reported as a novel coating for solid-phase microextraction (SPME). The nanocubes with a unique structure and composition were obtained by controlled etching of ZIF-8 with tannic acid (TA) followed by pyrolysis...
January 24, 2019: Nanoscale
Bin Du, Xizhen Xu, Jun He, Kuikui Guo, Wei Huang, Fengchan Zhang, Min Zhang, Yiping Wang
A simple vibration sensor is proposed and demonstrated based on an optical fiber Fabry-Perot interferometer (FPI) with an in-fiber collimator. The device was fabricated by splicing a quarter-pitch graded index fiber (GIF) with a section of a hollow-core fiber (HCF) interposed between single mode fibers (SMFs). The static displacement sensitivity of the FPI with an in-fiber collimator was 5.17 × 10-4 μm-1 , whereas the maximum static displacement sensitivity of the device without collimator was 1.73 × 10-4 μm-1 ...
January 21, 2019: Sensors
Wu-Qiang Wu, Yang-Fan Xu, Hong-Yan Chen, Dai-Bin Kuang, Cheng-Yong Su
The utilization of solar energy and the development of its related optoelectronic devices have become more important than ever. Solar cells or photoelectrochemical (PEC) cells that require the design of light harvesting assemblies for efficiently converting solar light into electricity or solar fuels are of particular interest. Semiconductor TiO2 , serving as the photoelectrode for photovoltaic devices (e.g., dye- or quantum dot-sensitized solar cells (DSSCs/QDSSCs) or perovskite solar cells (PSCs)) and PEC cells, has aroused intense research interest owing to its inherent characteristics of wide band gap and promising optical and electrical properties...
January 22, 2019: Accounts of Chemical Research
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