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https://www.readbyqxmd.com/read/28449548/vibration-induced-property-change-in-the-melting-and-solidifying-process-of-metallic-nanoparticles
#1
Yonggang Zheng, Liquan Ding, Hongfei Ye, Zhen Chen
Tuning material properties in the 3-D printing process of metallic parts is a challenging task of current interests. Much research has been conducted to understand the effects of controlling parameters such as the particle geometry (size and shape), heating, and cooling ways on the outcome of the printing process. However, nothing has been done to explore the system vibration effect. This letter reports our findings on the vibration-induced property change in the melting and solidifying process of silver nanoparticles with the use of molecular dynamics simulation...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28448123/enhancing-the-domain-wall-conductivity-in-lithium-niobate-single-crystals
#2
Christian Godau, Thomas Kämpfe, Andreas Thiessen, Lukas M Eng, Alexander Haußmann
Domain walls (DWs) in ferroelectric/ferroic materials have been in the central research focus for the last 50 years; DWs bear a multitude of extraordinary physical parameters within a unit-cell-sized lateral confinement. Especially, one outstanding feature has recently attracted a lot of attention for room-temperature applications, which is the potential to use DWs as 2-dimensional (2D) conducting channels that completely penetrate bulk compounds. Domain wall currents in lithium niobate (LNO) so far lie in the lower $pA$ regime...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28448119/sulfur-nano-dots-stitched-in-2d-bubble-like-interconnected-carbon-fabric-as-reversibility-enhanced-cathodes-for-lithium-sulfur-batteries
#3
Feng Wu, Yusheng Ye, Jia-Qi Huang, Teng Zhao, Ji Qian, Yuanyuan Zhao, Li Li, Lei Wei, Rui Luo, Yongxin Huang, Yi Xing, Renjie Chen
The behavior of two-dimensional (2D) materials for energy-storage systems relates to their morphology and physicochemical properties. Although various 2D materials can be found in different fields, the open access of these materials has greatly hampered their practical applications, such as in lithium sulfur batteries, where the soluble intermediates should be controlled. Here, we have developed a facile approach to prepare 2D ultra-thin interconnected carbon fabrics (ICFs) with "bubble-like" morphology and abundant mesopores using a "blowing bubble" method...
April 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28447989/fabrication-of-extracellular-matrix-derived-foams-and-microcarriers-as-tissue-specific-cell-culture-and-delivery-platforms
#4
Anna Kornmuller, Cody F C Brown, Claire Yu, Lauren E Flynn
Cell function is mediated by interactions with the extracellular matrix (ECM), which has complex tissue-specific composition and architecture. The focus of this article is on the methods for fabricating ECM-derived porous foams and microcarriers for use as biologically-relevant substrates in advanced 3D in vitro cell culture models or as pro-regenerative scaffolds and cell delivery systems for tissue engineering and regenerative medicine. Using decellularized tissues or purified insoluble collagen as a starting material, the techniques can be applied to synthesize a broad array of tissue-specific bioscaffolds with customizable geometries...
April 11, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28447487/tissue-engineered-vascular-grafts-current-state-of-the-field
#5
Chin Siang Ong, Xun Zhou, Chen Yu Huang, Takuma Fukunishi, Huaitao Zhang, Narutoshi Hibino
Conventional synthetic vascular grafts are limited by the inability to remodel, as well as issues of patency at smaller diameters. Tissue-engineered vascular grafts (TEVGs), constructed from biologically active cells and biodegradable scaffolds have the potential to overcome these limitations, and provide growth capacity and self-repair. Areas covered: This article outlines the TEVG design, biodegradable scaffolds, TEVG fabrication methods, cell seeding, drug delivery, strategies to reduce wait times, clinical trials, as well as a 5-year view with expert commentary...
April 27, 2017: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/28447029/cornell-alliance-for-science-evaluation-of-consensus-on-genetically-modified-food-safety-weaknesses-in-study-design
#6
Michael N Antoniou, Claire J Robinson
Cornell Alliance for Science has launched an initiative in which "citizen scientists" are called upon to evaluate studies on health risks of genetically modified (GM) crops and foods. The purpose is to establish whether the consensus on GM food safety claimed by the American Association for the Advancement of Science (AAAS) is supported by a review of the scientific literature. The Alliance's citizen scientists are examining more than 12,000 publication abstracts to quantify how far the scientific literature supports the AAAS's statement...
2017: Frontiers in Public Health
https://www.readbyqxmd.com/read/28446974/stents-for-airway-strictures-selection-and-results
#7
REVIEW
Adil Ayub, Adnan M Al-Ayoubi, Faiz Y Bhora
Airway stents can provide effective and timely relief in patients with central airway obstruction. Silicone based stents are the most commonly used airway stents worldwide with a long track record of safety. Metallic stents continue to evolve from the earliest uncovered versions to a variety of newly designed covered stents. Despite the availability of a variety of stent materials and designs, minimal advances have been made towards innovation in stent technology and an ideal stent has unfortunately not yet been developed...
March 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28446758/irradiation-induced-%C3%AE-to-%C3%AE-sic-transformation-at-low-temperature
#8
Chad M Parish, Takaaki Koyanagi, Sosuke Kondo, Yutai Katoh
We observed that β-SiC, neutron irradiated to 9 dpa (displacements per atom) at ≈1440 °C, began transforming to α-SiC, with radiation-induced Frank dislocation loops serving as the apparent nucleation sites. 1440 °C is a far lower temperature than usual β → α phase transformations in SiC. SiC is considered for applications in advanced nuclear systems, as well as for electronic or spintronic applications requiring ion irradiation processing. β-SiC, preferred for nuclear applications, is metastable and undergoes a phase transformation at high temperatures (typically 2000 °C and above)...
April 26, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28445803/jetvalve-rapid-manufacturing-of-biohybrid-scaffolds-for-biomimetic-heart-valve-replacement
#9
Andrew K Capulli, Maximillian Y Emmert, Francesco S Pasqualini, Debora Kehl, Etem Caliskan, Johan U Lind, Sean P Sheehy, Sung Jin Park, Seungkuk Ahn, Benedikt Weber, Josue A Goss, Simon P Hoerstrup, Kevin Kit Parker
Tissue engineered scaffolds have emerged as a promising solution for heart valve replacement because of their potential for regeneration. However, traditional heart valve tissue engineering has relied on resource-intensive, cell-based manufacturing, which increases cost and hinders clinical translation. To overcome these limitations, in situ tissue engineering approaches aim to develop scaffold materials and manufacturing processes that elicit endogenous tissue remodeling and repair. Yet despite recent advances in synthetic materials manufacturing, there remains a lack of cell-free, automated approaches for rapidly producing biomimetic heart valve scaffolds...
April 18, 2017: Biomaterials
https://www.readbyqxmd.com/read/28445033/c-h-functionalization-of-azines
#10
Kei Murakami, Shuya Yamada, Takeshi Kaneda, Kenichiro Itami
Azines, which are six-membered aromatic compounds containing one or more nitrogen atoms, serve as ubiquitous structural cores of aromatic species with important applications in biological and materials sciences. Among a variety of synthetic approaches toward azines, C-H functionalization represents the most rapid and atom-economical transformation, and it is advantageous for the late-stage functionalization of azine-containing functional molecules. Since azines have several C-H bonds with different reactivities, the development of new reactions that allow for the functionalization of azines in a regioselective fashion has comprised a central issue...
April 26, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28443608/dynamic-behaviour-of-interphases-and-its-implication-on-high-energy-density-cathode-materials-in-lithium-ion-batteries
#11
Wangda Li, Andrei Dolocan, Pilgun Oh, Hugo Celio, Suhyeon Park, Jaephil Cho, Arumugam Manthiram
Undesired electrode-electrolyte interactions prevent the use of many high-energy-density cathode materials in practical lithium-ion batteries. Efforts to address their limited service life have predominantly focused on the active electrode materials and electrolytes. Here an advanced three-dimensional chemical and imaging analysis on a model material, the nickel-rich layered lithium transition-metal oxide, reveals the dynamic behaviour of cathode interphases driven by conductive carbon additives (carbon black) in a common nonaqueous electrolyte...
April 26, 2017: Nature Communications
https://www.readbyqxmd.com/read/28442702/effect-of-gstp1-and-abcc2-polymorphisms-on-treatment-response-in-patients-with-advanced-non-small-cell-lung-cancer-undergoing-platinum-based-chemotherapy-a-study-in-a-chinese-uygur-population
#12
Zhi-Gang Han, Jie Tao, Ting-Ting Yu, Li Shan
BACKGROUND Gene polymorphisms are associated with sensitivity to platinum drugs. This study aimed to investigate the polymorphisms of GSTP1 rs1695 locus and ABCC2 rs717620 locus, and the sensitivity of patients with advanced non-small cell lung cancer (NSCLC) to platinum drugs in a Xinjiang Uygur population. MATERIAL AND METHODS The gene polymorphisms of GSTP1 rs1695 and ABCC2 rs717620 of Uygur NSCLC patients were assessed by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). The relationship between the prognosis of advanced NSCLC Uygur patients and the gene polymorphisms of GSTP1 rs1695 and ABCC2 rs717620 was analyzed using progression-free survival (PFS) and overall survival (OS) as the major outcome indicators...
April 26, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28442686/glaucoma-drainage-implant-surgery
#13
Ahmad A Aref, Steven J Gedde, Donald L Budenz
Glaucoma drainage implant (GDI) surgery represents a significant advance in the treatment of refractory glaucomas. Recent randomized clinical trials have compared the efficacy and safety of this technique to standard trabeculectomy. Several types of implant are currently available and differ in surface area, shape, composition, and the presence or absence of a flow-restricting valve. Two separate prospective, randomized clinical trials comparing 2 types of GDI have reported results after 5 years of follow-up...
2017: Developments in Ophthalmology
https://www.readbyqxmd.com/read/28441978/comparing-the-consistency-of-atom-probe-tomography-measurements-of-small-scale-segregation-and-clustering-between-the-leap-3000-and-leap-5000-instruments
#14
Tomas L Martin, Andrew J London, Benjamin Jenkins, Sarah E Hopkin, James O Douglas, Paul D Styman, Paul A J Bagot, Michael P Moody
The local electrode atom probe (LEAP) has become the primary instrument used for atom probe tomography measurements. Recent advances in detector and laser design, together with updated hit detection algorithms, have been incorporated into the latest LEAP 5000 instrument, but the implications of these changes on measurements, particularly the size and chemistry of small clusters and elemental segregations, have not been explored. In this study, we compare data sets from a variety of materials with small-scale chemical heterogeneity using both a LEAP 3000 instrument with 37% detector efficiency and a 532-nm green laser and a new LEAP 5000 instrument with a manufacturer estimated increase to 52% detector efficiency, and a 355-nm ultraviolet laser...
April 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28441229/preliminary-model-for-the-design-of-a-custom-middle-ear-prosthesis
#15
Brandon Kamrava, Jonathan A Gerstenhaber, Mamta Amin, Yah-El Har-El, Pamela C Roehm
HYPOTHESIS: Custom prostheses could be used to recreate the ossicular chain and improve hearing. BACKGROUND: Ossicular discontinuity or fixation occurs in 55% of cases of conductive hearing loss, with most cases involving the incus. Reconstruction has been achieved by a variety of methods; however, there has been little improvement in hearing outcomes in decades. METHODS: Precise measurements of anatomic dimensions, weight, and center of gravity were taken from 19 cadaveric incudes...
April 24, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28441014/chemistry-inspired-adaptable-framework-structures
#16
Zhiguo Xia, Kenneth R Poeppelmeier
Adaptable crystalline frameworks are important in modern solid-state chemistry as they are able to accommodate a wide range of elements, oxidation states, and stoichiometries. Owing to this ability, such adaptable framework structures are emerging as the prototypes for technologically important advanced functional materials. In this Account, the idea of cosubstitution is explored as a useful "pairing" concept that can potentially lead to the creation of many new members of one particular framework structure...
April 25, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28440615/monolith-supported-amine-functionalized-mg2-dobpdc-adsorbents-for-co2-capture
#17
Lalit A Darunte, Yuri Terada, Christopher R Murdock, Krista S Walton, David S Sholl, Christopher W Jones
The potential of using an amine-functionalized MOF, mmen-M2(dobpdc) (M = Mg, Mn), supported on a structured monolith contactor for CO2 capture from simulated flue gas is explored. The stability of the unsupported MOF powders under humid conditions is explored using nitrogen physisorption and X-ray diffraction analysis before and after exposure to humidity. Based on its superior stability to humidity, mmen-Mg2(dobpdc) is selected for further growth on a honeycomb cordierite monolith that is washcoated with α-alumina...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440567/dawson-type-polyoxomolybdate-anions-p2mo18o626-captured-by-ionic-liquid-on-graphene-oxide-as-high-capacity-anode-material-for-lithium-ion-batteries
#18
Yu-Fei Song, Jun Hu, Hongling Diao, Wenjing Luo
The development of advanced anode materials is of significance for the next generation of lithium ion batteries (LIBs). Herein, the imidazolium-based ionic liquids (ILs) was covalently grafted on the surface of graphene oxides (GO) via the carboxyl-amino bond,providing a loading hotbed for the Dawson-type POM of (NH4)6P2Mo18O62 (denoted as P2Mo18). The as-prepared GO-IL-P2Mo18 nanocomposite was characterized by FT-IR, Raman, TGA, SEM, TEM and XPS. When the nanocomposite was used as the anode material for lithium ion batteries (LIBs), it showed a high reversible capacity of 903...
April 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28440379/high-voltage-positive-electrode-materials-for-lithium-ion-batteries
#19
REVIEW
Wangda Li, Bohang Song, Arumugam Manthiram
The ever-growing demand for advanced rechargeable lithium-ion batteries in portable electronics and electric vehicles has spurred intensive research efforts over the past decade. The key to sustaining the progress in Li-ion batteries lies in the quest for safe, low-cost positive electrode (cathode) materials with desirable energy and power capabilities. One approach to boost the energy and power densities of batteries is to increase the output voltage while maintaining a high capacity, fast charge-discharge rate, and long service life...
April 25, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28440189/better-predictive-value-of-cancer-antigen125-ca125-as-biomarker-in-ovary-and-breast-tumors-and-its-correlation-with-the-histopathological-type-grade-of-the-disease
#20
Aarifa Nazmeen, Smarajit Maiti, Kusumita Mandal, Samir K Roy, Tamal Kanti Ghosh, Nirmalya K Sinha, Kamalika Mandal
BACKGROUND: Both ovarian/breast cancers are the most prevalent hormone-associated gynecological-cancers, where uncontrolled cellular proliferations/genetic-errors are noticed. The cancer-antigen125 (CA125), which we assessed presently is an important biomarker in the early detection/monitoring of this disease-pathogenesis. METHODS: Serum/tissue CA125 was measured by solid-phase-Enzyme-linked-immunosorbent-assay in women with ovarian/breast tumors of different types (epithelial/non-epithelial; benign/borderline/malignant)/stages...
April 24, 2017: Medicinal Chemistry
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