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https://www.readbyqxmd.com/read/28351016/nano-enabled-paper-humidity-sensor-for-mobile-based-point-of-care-lung-function-monitoring
#1
Mitradip Bhattacharjee, Harshal B Nemade, Dipankar Bandyopadhyay
The frequency of breathing and peak flow rate of exhaled air are necessary parameters to detect chronic obstructive pulmonary diseases (COPDs) such as asthma, bronchitis, or pneumonia. We developed a lung function monitoring point-of-care-testing device (LFM-POCT) consisting of mouthpiece, paper-based humidity sensor, micro-heater, and real-time monitoring unit. Fabrication of a mouthpiece of optimal length ensured that the exhaled air was focused on the humidity-sensor. The resistive relative humidity sensor was developed using a filter paper coated with nanoparticles, which could easily follow the frequency and peak flow rate of the human breathing...
March 22, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28350674/a-new-microtia-reconstruction-method-using-delayed-postauricular-skin-flap
#2
Gaofeng Li, Fan Zhang, Wei Ding, Zihan Wu, Yigao Hu, Tao Luo, Bo Zhang, Xia Jiang
BACKGROUND: This article presents a new microtia reconstruction method using a delayed postauricular skin flap. METHODS: The surgery is scheduled in three stages, the first of which delays the postauricular skin flap and deals with the remnant auricle. Three weeks later, the second stage is carried out. An erect, three-dimensional ear framework fabricated from autogenous rib cartilage is inserted between two flaps. The anterior auricular surface of the framework is draped with the delayed skin flap, and the postauricular surface is draped with postauricular fascia and overlying grafted skin...
April 2017: Plastic and Reconstructive Surgery
https://www.readbyqxmd.com/read/28350471/functionalized-molybdenum-disulphide-nanosheets-for-0d-2d-hybrid-nanostructure-photoinduced-charge-transfer-and-enhanced-photoresponse
#3
Razi Ahmad, Ritu Srivastava, Sushma Yadav, Dinesh Singh, Govind Gupta, Suresh Chand, Sameer Sapra
The high concentration stable dispersion of free standing mono- or few layer transition metal dichalcogenide (TMDs) nanosheets (NS) remains a significant barrier for their application in solution processed optoelectronic devices. Here, we report oleylamine (OLA) and dodecanethiol (DDT) assisted exfoliation of MoS2 NS in non-polar organic solvent 1,2 dichlorobenzene (DCB) which enable high concentration stable dispersion of free standing mono- or few layer nanosheets. During sonication the -NH2 or -SH group of OLA and DDT ligand, respectively, adsorb at the sulfur vacancy sites and edges...
March 28, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28350468/3d-proton-beam-writing-of-optically-active-coherent-vacancy-spins-in-silicon-carbide
#4
Hannes Kraus, Dmitrij Simin, Christian Kasper, Yoshinori Suda, Shunsuke Kawabata, Wataru Kada, Tomoya Honda, Yasuto Hijikata, Takeshi Ohshima, Vladimir Dyakonov, Georgy V Astakhov
Constructing quantum devices comprises various challenging tasks, especially when concerning their nanoscale geometry. For quantum color centers, the traditional approach is to fabricate the device structure after the non-deterministic placement of the centers. Reversing this approach, we present the controlled generation of quantum centers in silicon carbide (SiC) by focused proton beam in a non-complex manner without need for pre- or post-irradiation treatment. The generation depth and resolution can be predicted by matching the proton energy to the material's stopping power, and the amount of quantum centers at one specific sample volume is tuneable from ensembles of millions to discernible single photon emitters...
March 28, 2017: Nano Letters
https://www.readbyqxmd.com/read/28350466/wrapping-aligned-carbon-nanotube-composite-sheets-around-vanadium-nitride-nanowire-arrays-for-asymmetric-coaxial-fiber-shaped-supercapacitors-with-ultrahigh-energy-density
#5
Qichong Zhang, Xiaona Wang, Zhenghui Pan, Juan Sun, Jingxin Zhao, Jun Zhang, Cuixia Zhang, Lei Tang, Jie Luo, Bin Song, Zengxing Zhang, Weibang Lu, Qingwen Li, Yuegang Zhang, Yagang Yao
The emergence of fiber-shaped supercapacitors (FSSs) has led to a revolution in portable and wearable electronic devices. However, obtaining high energy density FSSs for practical applications is still a key challenge. This article exhibits a facile and effective approach to directly growth well-aligned three-dimensional vanadium nitride (VN) nanowire arrays (NWAs) on carbon nanotube (CNT) fiber with an ultrahigh specific capacitance of 715 mF/cm2 in a three-electrode system. Benefiting from their intriguing structural features, we successfully fabricated a prototype asymmetric coaxial FSS (ACFSS) with a maximum operating voltage of 1...
March 28, 2017: Nano Letters
https://www.readbyqxmd.com/read/28350447/self-functionalization-behind-a-solution-processed-niox-film-used-as-hole-transporting-layer-for-efficient-perovskite-solar-cells
#6
John Ciro, Daniel Ramírez, Mario Alejandro Mejía Escobar, Juan Felipe Montoya, Santiago Mesa, Rafael Betancur, Franklin Jaramillo
Fabrication of solution-processed perovskite solar cells (PSCs) requires the deposition of high quality films from precursor inks. Frequently, buffer layers of PSCs are formed from dispersions of metal oxide nanoparticles (NPs). Therefore, the development of trustable methods for the preparation of stable colloidal NPs dispersions is crucial. In this work, a novel approach to form very compact semiconducting buffer layers with suitable optoelectronic properties is presented through a self-functionalization process of the nanocrystalline particles by their own amorphous phase and without adding any other inorganic or organic functionalization component or surfactant...
March 28, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28350437/bacteria-activated-theranostic-nanoprobes-against-methicillin-resistant-staphylococcus-aureus-infection
#7
Zhiwei Zhao, Rong Yan, Xuan Yi, Jingling Li, Jiaming Rao, Zhengqing Guo, Yanmei Yang, Weifeng Li, Yong-Qiang Li, Chunying Chen
Despite numerous advanced imaging and sterilization techniques available nowadays, the sensitive in vivo diagnosis and complete elimination of drug-resistant bacterial infections remain to be big challenge. Here we report a strategy to design activatable theranostic nanoprobes against methicillin-resistant Staphylococcus aureus (MRSA) infections. This probe is based on silica nanoparticles coated with vancomycin-modified polyelectrolyte-cypate complexes (SiO2-Cy-Van), which is activated by an interesting phenomenon of bacteria-responsive dissociation of the polyelectrolyte from silica nanoparticles...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28350433/scalable-fabrication-of-photochemically-reduced-graphene-based-monolithic-micro-supercapacitors-with-superior-energy-and-power-densities
#8
Sen Wang, Zhong-Shuai Wu, Shuanghao Zheng, Feng Zhou, Chenglin Sun, Hui-Ming Cheng, Xinhe Bao
Micro-supercapacitors (MSCs) hold great promise as highly competitive miniaturized power sources satisfying the increased demand of smart integrated electronics. However, single-step scalable fabrication of MSCs with both high energy and power densities is still challenging. Here we demonstrate the scalable fabrication of graphene-based monolithic MSCs with diverse planar geometries and capable of superior integration by photochemical reduction of graphene oxide/TiO2 nanoparticle hybrid films. The resulting MSCs exhibit high volumetric capacitance of 233...
March 28, 2017: ACS Nano
https://www.readbyqxmd.com/read/28347129/bi-layer-channel-azo-zno-thin-film-transistors-fabricated-by-atomic-layer-deposition-technique
#9
Huijin Li, Dedong Han, Liqiao Liu, Junchen Dong, Guodong Cui, Shengdong Zhang, Xing Zhang, Yi Wang
This letter demonstrates bi-layer channel Al-doped ZnO/ZnO thin film transistors (AZO/ZnO TFTs) via atomic layer deposition process at a relatively low temperature. The effects of annealing in oxygen atmosphere at different temperatures have also been investigated. The ALD bi-layer channel AZO/ZnO TFTs annealed in dry O2 at 300 °C exhibit a low leakage current of 2.5 × 10(-13)A, I on/I off ratio of 1.4 × 10(7), subthreshold swing (SS) of 0.23 V/decade, and high transmittance. The enhanced performance obtained from the bi-layer channel AZO/ZnO TFT devices is explained by the inserted AZO front channel layer playing the role of the mobility booster...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28346840/fabrication-and-evaluation-of-phytomenadione-as-a-nanostructure-lipid-carrier-for-enhancement-of-bioavailability
#10
Bader Mubarak Aljaeid, Khaled Mohamed Hosny
Owing to its limited aqueous solubility, Phytomenadione (vitamin K) undergoes a low bioavailability (50%) with a large inter-individual variability after oral administration. Therefore, the aim of this work was to incorporate vitamine K into nanostructure lipid carrier systems to improve its aqueous solubility and bioavailability. Phytomenadione was used as a liquid lipid, Precirol ATO5, and Compritol ATO were used as solid lipids, Labrasol and Cremophore EL as water soluble surfactants, Capryol 90 and Lauroglycol as lipid soluble surfactants...
March 27, 2017: Pharmaceutical Development and Technology
https://www.readbyqxmd.com/read/28346825/fabrication-of-nico2-anchored-graphene-nanosheets-by-liquid-phase-exfoliation-for-excellent-microwave-absorber
#11
Ruilong Yang, Bochong Wang, Jianyong Xiang, Congpu Mu, Can Zhang, Fusheng Wen, Cong Wang, Can Su, Zhongyuan Liu
Graphene nanosheets (GNS) were prepared by an efficient liquid phase exfoliation method, and then the NiCo2/GNS nanohybrids were fabricated using the single-mode microwave-assisted hydrothermal technique. The NiCo2/GNS composites with different GNS proportion were investigated as a microwave absorber. Morphology investigation suggested that NiCo2 nanocrystals were uniformly anchored on the GNS without aggregation. The electromagnetic parameters of NiCo2/GNS nanohybrids could be artificially adjusted by changing the GNS proportion, which led to an exceptional microwave absorbing performance...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28346743/fabrication-of-a-mechanically-anisotropic-poly-glycerol-sebacate-membrane-for-tissue-engineering
#12
Chi-Nung Hsu, Pei-Yuan Lee, Ho-Yi Tuan-Mu, Chen-Yu Li, Jin-Jia Hu
Poly(glycerol sebacate) (PGS) has been used successfully as a scaffolding material for soft tissue engineering. PGS scaffolds, however, are usually mechanically isotropic, which may restrict their use in tissue repairs as many soft tissues in the body have anisotropic mechanical behaviors. Although various methods have been used to fabricate anisotropic scaffolds, it remains challenging to make anisotropic scaffolds from thermoset PGS. Here a new, simple method to fabricate an anisotropic PGS membrane which can then be used to construct thicker three-dimensional anisotropic scaffolds was developed...
March 27, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28346215/enhanced-optoelectronic-quality-of-perovskite-films-with-excess-ch3nh3i-for-high-efficient-solar-cells-in-ambient-air
#13
Yunhai Zhang, Huiru Lv, Can Cui, Lingbo Xu, Peng Wang, Hao Wang, Xuegong Yu, Jiangsheng Xie, Jiabin Huang, Zeguo Tang, Deren Yang
The solution-processed polycrystalline perovskite film contributes critically to the high photovoltaic performance of perovskite based solar cells (PSCs). The inevitable electronic trap states at grain boundaries and the intrinsic defects such as metallic lead (Pb0) and halide vacancies in perovskite film cause serious carrier recombination loss. Furthermore, the film can easily decompose into PbI2 in moisture atmosphere. Here, we introduce a simple strategy through a small increase in methylammonium iodide (CH3NH3I, MAI) molar proportion (5%) for perovskite fabrication in ambient air with a ~50% relative humidity...
March 27, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28346053/rapid-prototyping-of-a-cyclic-olefin-copolymer-microfluidic-device-for-automated-oocyte-culturing
#14
Miguel Berenguel-Alonso, Maria Sabés-Alsina, Roser Morató, Oriol Ymbern, Laura Rodríguez-Vázquez, Oriol Talló-Parra, Julián Alonso-Chamarro, Mar Puyol, Manel López-Béjar
Assisted reproductive technology (ART) can benefit from the features of microfluidic technologies, such as the automation of time-consuming labor-intensive procedures, the possibility to mimic in vivo environments, and the miniaturization of the required equipment. To date, most of the proposed approaches are based on polydimethylsiloxane (PDMS) as platform substrate material due to its widespread use in academia, despite certain disadvantages, such as the elevated cost of mass production. Herein, we present a rapid fabrication process for a cyclic olefin copolymer (COC) monolithic microfluidic device combining hot embossing-using a low-temperature cofired ceramic (LTCC) master-and micromilling...
January 1, 2017: SLAS Technol
https://www.readbyqxmd.com/read/28345891/tailored-chemical-properties-of-4-arm-star-shaped-poly-d-l-lactide-as-cell-adhesive-three-dimensional-scaffolds
#15
Chelladurai Karthikeyan Balavigneswaran, Sanjeev Kumar Mahto, Subia Bano, Arumugam Prabhakar, Kheyanath Mitra, Vivek Rao, Munia Ganguli, Biswajit Ray, Pralay Maiti, Nira Misra
Biodegradable poly(lactic acid) (PLA) is widely used to fabricate 3D scaffolds for tissue regeneration. However, PLA lacks cell adhering functional moieties, which limit its successful application in tissue engineering. Herein, we have tailored the cell adhesive properties of star shaped poly(D,L-Lactide) (ss-PDLLA) by grafting gelatin to their 4 arms. Grafting of gelatin on PDLLA backbone was confirmed by 1H NMR and FTIR. The synthesized star shaped poly(D,L-Lactide)-b-Gelatin (ss-pLG) exhibited enhanced wettability and protein adsorption...
March 27, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28345887/from-detection-to-resection-photoacoustic-tomography-and-surgery-guidance-with-au-liposome-icg-nanoparticles-in-liver-cancer
#16
Tianpei Guan, Wenting Shang, Hui Li, Xin Yang, Chihua Fang, Jie Tian, Kun Wang
Conventional imaging methods encounter challenges in diagnosing liver cancer that is less than 10 mm and/or without typical hypervascular features. With deep penetration and high spatial resolution imaging capability, the emerging photoacoustic tomography may offer better diagnostic efficacy for non-invasive liver cancer detection. Moreover, near-infrared fluorescence imaging guided hepatectomy was proven to be able to identify nodules at millimeter level. Thus, suitable photoacoustic and fluorescence dual-modality imaging probe may benefit patients in early diagnosis and complete resection...
March 27, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/28345872/intrinsically-stretchable-and-conductive-textile-by-a-scalable-process-for-elastic-wearable-electronics
#17
Chunya Wang, Mingchao Zhang, Kailun Xia, Xueqin Gong, Huimin Wang, Zhe Yin, Baolu Guan, Yingying Zhang
The prosperous development of stretchable electronics poses great demand in stretchable conductive materials which could maintain their electrical conductivity under tensile strain. Previously reported strategies to obtain stretchable conductors usually involve complex structure-fabricating processes or utilization of high-cost nanomaterials. It remains a great challenge to produce stretchable and conductive materials via a scalable and cost-effective process. A large-scalable pyrolysis strategy is developed for the fabrication of intrinsically stretchable and conductive textile utilizing low-cost and mass-produced weft-knitted textiles as raw materials...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345855/surface-modification-of-na3v2-po4-3-by-nitrogen-and-sulfur-dual-doped-carbon-layer-with-advanced-sodium-storage-property
#18
Xinghui Liang, Xing Ou, Fenghua Zheng, Qichang Pan, Xunhui Xiong, Renzong Hu, Chenghao Yang, Meilin Liu
Nitrogen and sulfur dual-doped carbon layer wrapped Na3V2(PO4)3 nanoparticles (NVP@NSC) have been successfully fabricated by a facile solid-state method. In this hierarchical structure, the Na3V2(PO4)3 nanoparticles are well dispersed and closely coated by nitrogen and sulfur dual-doped carbon layer, constructing an effective and interconnected conducting network to reduce the internal resistance. Furthermore, the uniform coating layers alleviate the agglomeration of Na3V2(PO4)3, as well as mitigate the side reaction between electrode and electrolyte...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345853/single-crystal-like-perovskite-for-high-performance-solar-cells-using-effective-merged-annealing-method
#19
Yanliang Liu, Insoo Shin, In-Wook Hwang, Seungmin Kim, Jihoon Lee, Mi-Sun Yang, Yun Kyung Jung, Jae-Won Jang, Jung Hyun Jeong, Sung Heum Park, Kwang Ho Kim
We report a simple, low cost, and quite effective method for achieving single-crystal-like CH3NH3PbI3 perovskite leading to a significant enhancement in the performance and stability of inverted planar perovskite solar cells (IPSCs). By employing a merged annealing method during the fabrication of an IPSC for preparing the perovskite CH3NH3PbI3 film, we remarkably increase the crystallinity of the CH3NH3PbI3 film and enhance the device performance and stability. An IPSC with the indium tin oxide/poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate)/CH3NH3PbI3 (active layer)/ [6,6]-phenyl-C61-butyric acid methyl ester/Al structure was fabricated using the merged annealing method and exhibited significantly enhanced performance with a high power conversion efficiency of 18...
March 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28345810/an-untrodden-path-versatile-fabrication-of-self-supporting-polymer-stabilized-percolation-membranes-pspms-for-gas-separation
#20
Sebastian Friebe, Alexander Mundstock, Daniel Schneider, Jürgen Caro
The preparation and scalability of zeolite or MOF membranes remains a major challenge, thus preventing the application of these materials in large-scale gas separation. Additionally, several zeolite or MOF materials are quite difficult or nearly impossible to grow as defect-free layers and require expensive macroporous ceramic or polymer supports. Here, we present a new approach for self-supporting zeolite and MOF composite membranes, called Polymer-Stabilized Percolation Membranes (PSPMs) consisting of a pressed gas selective percolation network - in our case ZIF-8, NaX and MIL-140 - and a gas impermeable infiltrated epoxy resin for cohesion...
March 27, 2017: Chemistry: a European Journal
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