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https://www.readbyqxmd.com/read/29775511/optimized-fibril-network-morphology-by-precise-side-chain-engineering-to-achieve-high-performance-bulk-heterojunction-organic-solar-cells
#1
Tao Liu, Lijun Huo, Sreelakshmi Chandrabose, Kai Chen, Guangchao Han, Feng Qi, Xiangyi Meng, Dongjun Xie, Wei Ma, Yuanping Yi, Justin M Hodgkiss, Feng Liu, Jing Wang, Chuluo Yang, Yanming Sun
A polymer fibril assembly can dictate the morphology framework, in forming a network structure, which is highly advantageous in bulk heterojunction (BHJ) organic solar cells (OSCs). A fundamental understanding of how to manipulate such a fibril assembly and its influence on the BHJ morphology and device performance is crucially important. Here, a series of donor-acceptor polymers, PBT1-O, PBT1-S, and PBT1-C, is used to systematically investigate the relationship between molecular structure, morphology, and photovoltaic performance...
May 18, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29758675/electrically-modulated-capillary-filling-imbibition-of-nematic-liquid-crystals
#2
Jayabrata Dhar, Suman Chakraborty
The flow of nematic liquid crystals (NLCs) in the presence of an electric field is typically characterized by the variation in its rheological properties due to transition in its molecular arrangements. Here, we bring out a nontrivial interplay of a consequent alteration in the resistive viscous effects and driving electrocapillary interactions, toward maneuvering the capillary filling dynamics over miniaturized scales. Considering a dynamic interplay of the relevant bulk and interfacial forces acting in tandem, our results converge nicely to previously reported experimental data...
April 2018: Physical Review. E
https://www.readbyqxmd.com/read/29745949/probing-excitons-in-transition-metal-dichalcogenides-by-drude-like-exciton-intraband-absorption
#3
Siqi Zhao, Dawei He, Jiaqi He, Xinwu Zhang, Lixin Yi, Yongsheng Wang, Hui Zhao
Understanding excitonic dynamics in two-dimensional semiconducting transition metal dichalcogenides is important for developing their optoelectronic applications. Recently, transient absorption techniques based on resonant excitonic absorption have been used to study various aspects of excitonic dynamics in these materials. The transient absorption in such measurements originates from phase-space state filling, bandgap renormalization, or screening effects. Here we report a new method to probe excitonic dynamics based on exciton intraband absorption...
May 10, 2018: Nanoscale
https://www.readbyqxmd.com/read/29732015/push-out-bond-strength-of-intra-orifice-barrier-materials-bulk-fill-composite-versus-calcium-silicate-cement
#4
Taha Özyurek, Gülşah Uslu, Koray Yilmaz
Background. The aim of this study was to compare the push-out bond strengths of calcium silicate-based ProRoot MTA and Biodentine cements and SureFil SDR and EverX Posterior bulk-fill composite resins. Methods. Twenty-four single-rooted maxillary central incisors were sectioned below the cementoenamel junction, and the root canals were instrumented using rotary files. Thereafter, a parallel post drill was used to obtain a standardized root canal dimension. The roots were randomly assigned to one of the following groups with respect to the intra-orifice barrier used: ProRoot MTA; Biodentine; SureFil SDR; EverX Posterior...
2018: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/29724024/assessment-of-performance-of-the-industrial-process-of-bulk-vacuum-packaging-of-raw-meat-with-nondestructive-optical-oxygen-sensing-systems
#5
Caroline A Kelly, Malco Cruz-Romero, Joseph P Kerry, Dmitri P Papkovsky
The commercially-available optical oxygen-sensing system Optech-O₂ Platinum was applied to nondestructively assess the in situ performance of bulk, vacuum-packaged raw beef in three ~300 kg containers. Twenty sensors were attached to the inner surface of the standard bin-contained laminate bag (10 on the front and back sides), such that after filling with meat and sealing under vacuum, the sensors were accessible for optical interrogation with the external reader device. After filling and sealing each bag, the sensors were measured repetitively and nondestructively over a 15-day storage period at 1 °C, thus tracking residual oxygen distribution in the bag and changes during storage...
May 2, 2018: Sensors
https://www.readbyqxmd.com/read/29719754/single-crystalline-feco-nanoparticle-filled-carbon-nanotubes-synthesis-structural-characterization-and-magnetic-properties
#6
Rasha Ghunaim, Maik Scholz, Christine Damm, Bernd Rellinghaus, Rüdiger Klingeler, Bernd Büchner, Michael Mertig, Silke Hampel
In the present work, we demonstrate different synthesis procedures for filling carbon nanotubes (CNTs) with equimolar binary nanoparticles of the type Fe-Co. The CNTs act as templates for the encapsulation of magnetic nanoparticles and provide a protective shield against oxidation as well as prevent nanoparticle agglomeration. By variation of the reaction parameters, we were able to tailor the sample purity, degree of filling, the composition and size of the filling particles, and therefore, the magnetic properties...
2018: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/29714788/2-6-mj-100-hz-cep-stable-near-single-cycle-4-%C3%AE-m-laser-based-on-opcpa-and-hollow-core-fiber-compression
#7
Pengfei Wang, Yanyan Li, Wenkai Li, Hongpeng Su, Beijie Shao, Shuai Li, Cheng Wang, Ding Wang, Ruirui Zhao, Yujie Peng, Yuxin Leng, Ruxin Li, Zhizhan Xu
A carrier-envelope-phase-stable near-single-cycle mid-infrared laser based on optical parametric chirped pulse amplification and hollow-core fiber compression is demonstrated. A 4 μm laser pulse with 11.8 mJ energy is delivered from a KTA-based optical parametric chirped pulse amplification (OPCPA) with 100 Hz repetition rate, and compressed to 105 fs by a two-grating compressor with efficiency over 50%. Subsequently, the pulse spectrum is broadened by employing a krypton gas-filled hollow-core fiber. Then, the pulse duration is further compressed to 21...
May 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29714704/depth-of-cure-of-proximal-composite-resin-restorations-using-a-new-perforated-metal-matrix
#8
Duke P Nguyen, Nancy C Motyka, Erik J Meyers, Kraig S Vandewalle
The purpose of this study was to compare the depths of cure of a proximal box preparation filled in bulk with various approaches: filled with a bulk-fill or conventional composite; placed with a new perforated metal matrix, a traditional metal matrix, or a clear matrix; and polymerized with either occlusal-only or tri-sited light curing. After tri-sited curing, the use of the new perforated metal matrix band resulted in a depth of cure that was not significantly different from that achieved with the use of metal bands (removed during curing) or transparent matrix bands...
May 2018: General Dentistry
https://www.readbyqxmd.com/read/29714702/effect-of-fiber-inserts-on-gingival-margin-microleakage-of-class-ii-bulk-fill-composite-resin-restorations
#9
Fereshteh Shafiei, Maryam Doozandeh, Vahid Karimi
This study evaluated the effect of fiber inserts combined with composite resins on enamel and dentin margin microleakage. The fiber inserts were used with high- (x-tra fil) and low-viscosity (x-tra base) bulk-fill composite resins and as well as conventional composite resins (Grandio and Grandio Flow). In 96 sound, recently extracted molars, 2 standardized Class II cavities were prepared. The teeth were randomly divided into 8 groups of 12 teeth each, based on composite resin type and presence or absence of fiber inserts: groups 1 and 2, x-tra fil with and without fiber inserts, respectively; groups 3 and 4, x-tra base with and without fiber inserts; groups 5 and 6, Grandio with and without fiber inserts; and groups 7 and 8, Grandio Flow liner (gingival floor)/Grandio (remainder of cavity) with and without fiber inserts...
May 2018: General Dentistry
https://www.readbyqxmd.com/read/29714178/hybrid-modelling-of-a-high-power-x-ray-attenuator-plasma
#10
Álvaro Martín Ortega, Ana Lacoste, Tiberiu Minea
X-ray gas attenuators act as stress-free high-pass filters for synchrotron and free-electron laser beamlines to reduce the heat load in downstream optical elements without affecting other properties of the X-ray beam. The absorption of the X-ray beam triggers a cascade of processes that ionize and heat up the gas locally, changing its density and therefore the X-ray absorption. Aiming to understand and predict the behaviour of the gas attenuator in terms of efficiency versus gas pressure, a hybrid model has been developed, combining three approaches: an analytical description of the X-ray absorption; Monte Carlo for the electron thermalization; and a fluid treatment for the electron diffusion, recombination and excited-states relaxation...
May 1, 2018: Journal of Synchrotron Radiation
https://www.readbyqxmd.com/read/29695115/application-of-recycled-ceramic-aggregates-for-the-production-of-mineral-asphalt-mixtures
#11
Wojciech Andrzejuk, Danuta Barnat-Hunek, Rafat Siddique, Bartosz Zegardło, Grzegorz Łagód
This paper describes a method of designing and producing innovative mineral⁻asphalt mixtures, which utilize waste aggregate from the recycling of sanitary ceramics. The work presents the basic properties of the ceramic material, the investigation concerning the microstructure of the aggregate obtained from the grinding of waste, and a comparison with the images obtained for the aggregates usually employed in mineral⁻asphalt mixtures. The mixtures were designed for the application in the wearing course. Four series of mixtures were prepared...
April 24, 2018: Materials
https://www.readbyqxmd.com/read/29691436/assessing-the-nature-of-the-distribution-of-localised-states-in-bulk-gaasbi
#12
Tom Wilson, Nicholas P Hylton, Yukihiro Harada, Phoebe Pearce, Diego Alonso-Álvarez, Alex Mellor, Robert D Richards, John P R David, Nicholas J Ekins-Daukes
A comprehensive assessment of the nature of the distribution of sub band-gap energy states in bulk GaAsBi is presented using power and temperature dependent photoluminescence spectroscopy. The observation of a characteristic red-blue-red shift in the peak luminescence energy indicates the presence of short-range alloy disorder in the material. A decrease in the carrier localisation energy demonstrates the strong excitation power dependence of localised state behaviour and is attributed to the filling of energy states furthest from the valence band edge...
April 24, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29691080/implant-failure-after-motec-wrist-joint-prosthesis-due-to-failure-of-ball-and-socket-type-articulation-two-patients-with-adverse-reaction-to-metal-debris-and-polyether-ether-ketone
#13
Teemu Karjalainen, Konsta Pamilo, Aleksi Reito
We describe 2 cases of articulation-related failures resulting in revision surgery after a Motec total wrist arthroplasty: one with an adverse reaction to metal debris and the other with an adverse reaction to polyether ether ketone. In the first patient, blood cobalt and chrome levels were elevated and magnetic resonance imaging showed clear signs of a pseudotumor. The other patient had an extensive release of polyether ether ketone particles into the surrounding synovia due to adverse wear conditions in the cup, leading to the formation of a fluid-filled cyst sac with a black lining and diffuse lymphocyte-dominated inflammation in the synovia...
April 21, 2018: Journal of Hand Surgery
https://www.readbyqxmd.com/read/29689648/qualitative-analysis-of-the-margins-of-restorations-made-with-different-filling-resins
#14
Monika Ostapiuk, Bożena Tarczydło, Barbara Surowska, Mirosław Orłowski, Barbara Tymczyna, Teresa Bachanek, Anna Rzepecka, Anna Mróz
PURPOSE: In this study the comparative results obtained from examinations of two different restorative composites with different cavities filling method are presented. Micro-CT was used for the evaluation of the marginal integrity and quality of composite fillings in connection with microstructural investigations made by both optical and scanning electron microscopy. MATERIALS AND METHODS: The examinations of dental tooth filings in bulk-fill technique were based on micro-CT and microscopy observations...
April 24, 2018: Microscopy Research and Technique
https://www.readbyqxmd.com/read/29689415/prediction-of-the-rate-of-the-rise-of-an-air-bubble-in-nanofluids-in-a-vertical-tube
#15
Heon Ki Cho, Alex D Nikolov, Darsh T Wasan
Our recent experiments have demonstrated that when a bubble rises through a nanofluid (a liquid containing dispersed nanoparticles) in a vertical tube, a nanofluidic film with several particle layers is formed between the gas bubble and the glass tube wall, which significantly changes the bubble velocity due to the nanoparticle layering phenomenon in the film. We calculated the structural nanofilm viscosity as a function of the number of particle layers confined in it and found that the film viscosity increases rather steeply when the film contains only one or two particle layers...
April 19, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29689293/molar-cusp-deformation-evaluated-by-micro-ct-and-enamel-crack-formation-to-compare-incremental-and-bulk-filling-techniques
#16
Laís Rani Sales Oliveira, Stella Sueli Lourenço Braga, Aline Arêdes Bicalho, Maria Tereza Hordones Ribeiro, Richard Bengt Price, Carlos José Soares
OBJECTIVES: To describe a method of measuring the molar cusp deformation using micro-computed tomography (micro-CT), the propagation of enamel cracks using transillumination, and the effects of hygroscopic expansion after incremental and bulk-filling resin composite restorations. METHODS: Twenty human molars received standardized Class II mesio-occlusal-distal cavity preparations. They were restored with either a bulk-fill resin composite, X-tra fil (XTRA), or a conventional resin composite, Filtek Z100 (Z100)...
April 21, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29676977/flared-roots-reinforced-with-bulk-fill-flowable-composite-case-report
#17
R Braz, V A Mergulhão, L R Oliveira, M S Alves, C A Canto
This article presents a case report for the treatment of a patient with a flared root. The patient was treated with a bulk-fill flowable composite. This innovative approach seems to be efficient in reinforcing flared roots. The advantages and disadvantages of the technique are presented.
May 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29649634/injectable-porous-biohybrid-hydrogels-incorporating-decellularized-tissue-components-for-soft-tissue-applications
#18
Yang Zhu, Sato Hideyoshi, Hongbin Jiang, Yasumoto Matsumura, Jenna L Dziki, Samuel T LoPresti, Luai Huleihel, Gabriela N F Faria, Leah C Fuhrman, Ricardo Lodono, Stephen F Badylak, William R Wagner
Biodegradable injectable hydrogels have been extensively studied and evaluated in various medical applications such as for bulking agents, drug delivery reservoirs, temporary barriers, adhesives, and cell delivery matrices. Where injectable hydrogels are intended to facilitate a healing response, it may be desirable to encourage rapid cellular infiltration into the hydrogel volume from the tissue surrounding the injection site. In this study, we developed a platform technique to rapidly form pores in a thermally responsive injectable hydrogel, poly(NIPAAm-co-VP-co-MAPLA) by using mannitol particles as porogens...
April 9, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29643411/sorbent-film-coated-passive-samplers-for-explosives-vapour-detection-part-b-deployment-in-semi-operational-environments-and-alternative-applications
#19
Gillian L McEneff, Alexandra Richardson, Tony Webb, Dan Wood, Bronagh Murphy, Rachel Irlam, Jim Mills, David Green, Leon P Barron
The application of new sorbent-film coated passive samplers for capture of bulk commercial and military explosives vapours in operationally relevant spaces such as luggage, rooms, vehicles and shipping containers is presented. Samplers were easily integrated with in-service detection technologies with little/no sample preparation required. Ethylene glycol dinitrate (EGDN) was detected within 4 h in a container holding a suitcase packed with 0.2 kg Perunit 28E. Within a 22,000 dm3 room, 1 kg of concealed Seguridad was detected within 24 h and in an adjoining room within 7 days...
April 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29627738/polymerization-shrinkage-stress-of-resin-based-dental-materials-a-systematic-review-and-meta-analyses-of-composition-strategies
#20
REVIEW
Carine Tais Welter Meereis, Eliseu Aldrighi Münchow, Wellington Luiz de Oliveira da Rosa, Adriana Fernandes da Silva, Evandro Piva
PURPOSE: A systematic review was conducted to determine whether there were composition strategies available to reduce and control polymerization shrinkage stress development in resin-based restorative dental materials. DATA SOURCES: This report was reported in accordance with the PRISMA Statement. Two reviewers performed a literature search up to December 2016, without restriction of the year of publication, in seven databases: PubMed, Web of Science, Scopus, SciELO, LILACS, IBECS, and BBO...
March 23, 2018: Journal of the Mechanical Behavior of Biomedical Materials
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