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https://www.readbyqxmd.com/read/29785846/d-a-d-typed-hole-transport-materials-for-efficient-perovskite-solar-cells-tuning-photovoltaic-properties-via-the-acceptor-group
#1
Peng Xu, Peng Liu, Yuanyuan Li, Bo Xu, Lars Kloo, Licheng Sun, Yong Hua
Two D-A-D structured hole-transport materials (YN1 and YN2) have been synthesized and used in perovskite solar cells. The two HTMs have low-lying HOMO levels and impressive mobility. PSCs fabricated with YN2 showed a PCE value of 19.27% in ambient air, which is significantly higher than that of Spiro-OMeTAD (17.80%). PSCs based on YN1 showed an inferior PCE of 16.03%. We found that the incorporation of the stronger electron-withdrawing group in the HTM YN2 improves the PCE of PSCs. Furthermore, the YN2-based PSCs exhibit good long-term stability retaining 91...
May 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29770172/prevention-of-cross-contamination-risk-by-disinfection-of-irreversible-hydrocolloid-impression-materials-with-ozonated-water
#2
Omid Savabi, Farahnaz Nejatidanesh, Kamran Poshang Bagheri, Leila Karimi, Ghazal Savabi
Background: Disinfection of dental impression is mandatory for preventing the cross infection between dental staff and dental laboratory. Ozone as a disinfectant can be used in various ways in dentistry. The aim of this study was to evaluate the efficacy of ozonated water for disinfection of irreversible hydrocolloid impression materials and preventing cross-contamination. Methods: Thirty-two circular specimens (1 cm diameter and 2 mm thickness) of irreversible hydrocolloid impression material were made...
2018: International Journal of Preventive Medicine
https://www.readbyqxmd.com/read/29769382/personalized-symptom-goals-and-patient-global-impression-on-clinical-changes-in-advanced-cancer-patients
#3
Sebastiano Mercadante, Claudio Adile, Gaetano Lanzetta, Kyriaki Mystakidou, Marco Maltoni, Luiz Guilherme Soares, Stefano De Santis, Patrizia Ferrera, Marco Valenti, Marta Rosati, Romina Rossi, Andrea Cortegiani, Francesco Masedu, Franco Marinangeli, Federica Aielli
BACKGROUND: The aim of this study was to assess the patients' global impression (PGI) after symptom management, as well as the achievement of personalized symptom goals (PSG). The secondary outcome was to assess related factors. Subjects, Materials, and Methods . Advanced cancer patients admitted to palliative care units rated symptom intensity by using the Edmonton Symptom Assessment Score (ESAS) at admission and then after 1 week. For each symptom, patient-reported PGI and PSG, as well as the rate of PSG response, were evaluated...
May 16, 2018: Oncologist
https://www.readbyqxmd.com/read/29763356/chairside-cad-cam-composite-onlays-for-the-restoration-of-primary-molars
#4
Elisabeth Dursun, Aude Monnier-Da Costa, Christian Moussally
After pulp therapy or with multi-surface caries in primary molars, pre-formed stainless steel crowns are usually placed to ensure tooth longevity. Esthetic alternatives, such as zirconia crowns, have been proposed, but they are invasive. Here we describe two cases of chairside computer-aided design and computer-aided manufacturing (CAD/CAM) technology used to treat extended and/or deep caries on primary molars. A powder-free chairside CAD/CAM system, a milling unit and machinable high-performance composite blocks were used...
May 15, 2018: Journal of Clinical Pediatric Dentistry
https://www.readbyqxmd.com/read/29762187/reliability-of-the-osstell-implant-stability-quotient-and-penguin-resonance-frequency-analysis-to-evaluate-implant-stability
#5
Gul Buyukguclu, Zeynep Ozkurt-Kayahan, Ender Kazazoglu
PURPOSE: To evaluate the reliability of the Osstell implant stability quotient (ISQ) and Penguin resonance frequency analysis (RFA) devices in measuring implant stability. MATERIALS AND METHODS: Forty implants were embedded in self-curing acrylic resin, soft-lining material, polyvinyl siloxane impression material, and polycarboxylate cement (n = 10). After the initial setting times were completed, the stability of each implant was measured with Osstell ISQ and Penguin RFA with 3 repeated measurements...
May 10, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29757639/a-helicene-nanoribbon-with-greatly-amplified-chirality
#6
Nathaniel J Schuster, Raúl Hernández Sánchez, Daria Bukharina, Nicholas A Kotov, Nina Berova, Fay Ng, Michael L Steigerwald, Colin Nuckolls
We report the synthesis and characterization of a chiral, shape-persistent, perylene-diimide-based nanoribbon. Specifically, the fusion of three perylene-diimide monomers with intervening naphthalene subunits resulted in a helical superstructure with two [6]helicene subcomponents. This π-helix-of-helicenes exhibits very intense electronic circular dichroism, including one of the largest Cotton effects ever observed in the visible range. It also displays more than an order of magnitude increase in circular dichroism for select wavelengths relative to its smaller homologue...
May 14, 2018: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29751162/recent-advances-in-dna-nanotechnology
#7
REVIEW
Pongphak Chidchob, Hanadi F Sleiman
DNA is a powerful guiding molecule to achieve the precise construction of arbitrary structures and high-resolution organization of functional materials. The combination of sequence programmability, rigidity and highly specific molecular recognition in this molecule has resulted in a wide range of exquisitely designed DNA frameworks. To date, the impressive potential of DNA nanomaterials has been demonstrated from fundamental research to technological advancements in materials science and biomedicine. This review presents a summary of some of the most recent developments in structural DNA nanotechnology regarding new assembly approaches and efforts in translating DNA nanomaterials into practical use...
May 8, 2018: Current Opinion in Chemical Biology
https://www.readbyqxmd.com/read/29750102/evaluation-of-accuracy-of-various-impression-techniques-and-impression-materials-in-recording-multiple-implants-placed-unilaterally-in-a-partially-edentulous-mandible-an-in-vitro-study
#8
G Parameshwari, B Chittaranjan, N Sudhir, C-K Anulekha-Avinash, M Taruna, M Ramureddy
Background: Various factors like implant angulation, type of impression material and tray type affects the implant impression accuracy. To date limited in-vitro studies were carried out on the implant impression accuracy of unilateral partially edentulous arches. The aim of this research was to evaluate the effects of 0o, 15o and 25o implant angulations on impression accuracy in simulated master casts of unilateral partially edentulous situation using different impression materials and tray selections...
April 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29747468/high-switching-ratio-photodetectors-based-on-perovskite-ch%C3%A2-nh%C3%A2-pbi%C3%A2-nanowires
#9
Xin Zhang, Caichi Liu, Gang Ren, Shiyun Li, Chenghao Bi, Qiuyan Hao, Hui Liu
Hybrid organic-inorganic perovskite materials have attracted extensive attention due to their impressive performance in photovoltaic devices. One-dimensional perovskite CH₃NH₃PbI₃ nanomaterials, possessing unique structural features such as large surface-to-volume ratio, anisotropic geometry and quantum confinement, may have excellent optoelectronic properties, which could be utilized to fabricate high-performance photodetectors. However, in comparison to CH₃NH₃PbI₃ thin films, reports on the fabrication of CH₃NH₃PbI₃ nanowires for optoelectrical application are rather limited...
May 10, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29747458/filament-advance-detection-sensor-for-fused-deposition-modelling-3d-printers
#10
Enrique Soriano Heras, Fernando Blaya Haro, José M de Agustín Del Burgo, Manuel Islán Marcos, Roberto D'Amato
The main purpose of this paper is to present a system to detect extrusion failures in fused deposition modelling (FDM) 3D printers by sensing that the filament is moving forward properly. After several years using these kind of machines, authors detected that there is not any system to detect the main problem in FDM machines. Authors thought in different sensors and used the weighted objectives method, one of the most common evaluation methods, for comparing design concepts based on an overall value per design concept...
May 9, 2018: Sensors
https://www.readbyqxmd.com/read/29745321/selected-applications-for-current-polymers-in-prosthetic-dentistry-state-of-the-art
#11
Maciej Kawala, Joanna Smardz, Lukasz Adamczyk, Natalia Grychowska, Mieszko Wieckiewicz
BACKGROUND: Polymers are widely applied in medicine, including dentistry, i.e. in prosthodontics. AIM: The following paper is aimed at demonstrating the applications of selected modern polymers in prosthetic dentistry based on the reported literature. MATERIAL AND METHODS: The study was conducted using the PubMed, SCOPUS and CINAHL databases in relation to documents published during 1999-2017. The following keywords were used: polymers with: prosthetic dentistry, impression materials, denture base materials, bite registration materials, denture soft liners, occlusal splint materials and 3D printing...
May 10, 2018: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/29741364/multiscale-control-of-nanocellulose-assembly-transferring-remarkable-nanoscale-fibril-mechanics-to-macroscale-fibers
#12
Nitesh Mittal, Farhan Ansari, Krishne Gowda V, Christophe Brouzet, Pan Chen, Per Tomas Larsson, Stephan V Roth, Fredrik Lundell, Lars Wågberg, Nicholas A Kotov, L Daniel Söderberg
Nanoscale building blocks of many materials exhibit extraordinary mechanical properties due to their defect-free molecular structure. Translation of these high mechanical properties to macroscopic materials represents a difficult materials engineering challenge due to the necessity to organize these building blocks into multiscale patterns and mitigate defects emerging at larger scales. Cellulose nanofibrils (CNFs), the most abundant structural element in living systems, has impressively high strength and stiffness, but natural or artificial cellulose composites are 3-15 times weaker than the CNFs...
May 9, 2018: ACS Nano
https://www.readbyqxmd.com/read/29732347/use-of-magnetic-resonance-imaging-in-food-quality-control-a-review
#13
REVIEW
Hamed Ebrahimnejad, Hadi Ebrahimnejad, A Salajegheh, H Barghi
Modern challenges of food science require a new understanding of the determinants of food quality and safety. Application of advanced imaging modalities such as magnetic resonance imaging (MRI) has seen impressive successes and fast growth over the past decade. Since MRI does not have any harmful ionizing radiation, it can be considered as a magnificent tool for the quality control of food products. MRI allows the structure of foods to be imaged noninvasively and nondestructively. Magnetic resonance images can present information about several processes and material properties in foods...
March 2018: Journal of Biomedical Physics & Engineering
https://www.readbyqxmd.com/read/29732053/fluoranthene-based-dopant-free-hole-transporting-materials-for-efficient-perovskite-solar-cells
#14
Xianglang Sun, Qifan Xue, Zonglong Zhu, Qi Xiao, Kui Jiang, Hin-Lap Yip, He Yan, Zhong'an Li
Significant efforts have been devoted to developing new dopant-free hole transporting materials (HTMs) for perovskite solar cells (PVSCs). Fluoranthene is one typical cyclopentene-fused polycyclic aromatic hydrocarbon with a rigid planarized structure, and thus could be an ideal building block to construct dopant-free HTMs, which have not been reported yet. Here, we report a new and simple synthetic method to prepare unreported 2,3-dicyano-fluoranthene through a Diels-Alder reaction between dibenzofulvene and tetracyanoethylene, and demonstrate that it can serve as an efficient electron-withdrawing unit for constructing donor-acceptor (D-A) type HTMs...
March 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29728542/fracture-strength-of-posterior-crowns-made-of-adoro-and-gradia-fiber-reinforced-composites
#15
Hosseinali Mahgoli, Mahnaz Arshad, Mehdi Saeedirad, Mohammad H Mahgoli
Aim: The aim of this study was to assess the fracture strength of posterior crowns made of Adoro and Gradia fiber-reinforced composites (FRCs). Materials and methods: In this in vitro, experimental study, extracted sound 37 maxillary first and second premolars were selected. A celluloid index was taken from teeth and the teeth received crown preparation. Impressions were made and poured. Composite crowns were fabricated of Adoro and Gradia composite resins. After curing, the teeth were immersed in distilled water for 24 hours and thermal cycled for 6,000 cycles between 5 and 55°C...
April 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29724404/causal-reports-context-dependent-contributions-of-intuitive-physics-and-visual-impressions-of-launching
#16
Michele Vicovaro
Everyday causal reports appear to be based on a blend of perceptual and cognitive processes. Causality can sometimes be perceived automatically through low-level visual processing of stimuli, but it can also be inferred on the basis of an intuitive understanding of the physical mechanism that underlies an observable event. We investigated how visual impressions of launching and the intuitive physics of collisions contribute to the formation of explicit causal responses. In Experiment 1, participants observed collisions between realistic objects differing in apparent material and hence implied mass, whereas in Experiment 2, participants observed collisions between abstract, non-material objects...
May 2018: Acta Psychologica
https://www.readbyqxmd.com/read/29723333/influence-of-ethanol-on-dentin-roughness-surface-free-energy-and-interaction-between-ah-plus-and-root-dentin
#17
Carlos Augusto de Morais Souto Pantoja, Diogo Henrique da Silva, Adriana de Jesus Soares, Caio Cezar Randi Ferraz, Brenda Paula Figueiredo de Almeida Gomes, Alexandre Augusto Zaia, José Flávio Affonso de Almeida
This study aimed to evaluate the influence of different ethanol concentrations on dentin roughness, surface free energy, and contact angle between AH Plus and the root canal dentin. One hundred human maxillary anterior teeth were split longitudinally and 200 dentin specimens were polished to make the surface flatter and smoother. An acrylic bar was positioned between two dentin specimens and impression material was added to create a block, simulating an instrumented root canal space. Specimens were removed from the mold and cleaned in an ultrasonic bath for 10 min...
2018: Brazilian Oral Research
https://www.readbyqxmd.com/read/29721423/moving-to-aqueous-binder-a-valid-approach-to-achieving-high-rate-capability-and-long-term-durability-for-sodium-ion-battery
#18
Jing Zhao, Xu Yang, Ye Yao, Yu Gao, Yongming Sui, Bo Zou, Helmut Ehrenberg, Gang Chen, Fei Du
Polyanionic Na3 V2 (PO4 )2 F3 with a NASICON-type structure is heralded as a promising cathode material for sodium-ion batteries due to its fast ionic conduction, high working voltage, and favorable structural stability. However, a number of challenging issues remain regarding its rate capability and cycle life, which must be addressed to enable greater application compatibility. Here, a facile and effective approach that can be used to overcome these disadvantages by introducing an aqueous carboxymethyl cellulose (CMC) binder is reported...
April 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29716029/feature-issue-introduction-advanced-solid-state-lasers-2017
#19
Benoît Boulanger, Shibin Jiang, Sergey Mirov, Johan Nilsson, Alan Petersen, Fabian Rotermund, Stefano Taccheo, Takunori Taira
The Advanced Solid State Lasers 2017 Conference (ASSL) was held from October 1 to 5, 2017. It was an extraordinary conference at the Nagoya Congress Center in Nagoya, Japan. ASSL 2017 again suggested an impressive platform where miscellaneous perceptions with a variety of approaches to optics, photonics, sensing, laser technology, laser systems, and solid state lasers were presented. This international meeting was highly selective, leading to high level contributions through one plenary conference, 17 invited presentations, 70 regular talks, and 121 posters...
April 16, 2018: Optics Express
https://www.readbyqxmd.com/read/29710822/effect-of-temperature-and-growth-time-on-vertically-aligned-zno-nanorods-by-simplified-hydrothermal-technique-for-photoelectrochemical-cells
#20
Laimy Mohd Fudzi, Zulkarnain Zainal, Hong Ngee Lim, Sook-Keng Chang, Araa Mebdir Holi, Mahanim Sarif Mohd Ali
Despite its large band gap, ZnO has wide applicability in many fields ranging from gas sensors to solar cells. ZnO was chosen over other materials because of its large exciton binding energy (60 meV) and its stability to high-energy radiation. In this study, ZnO nanorods were deposited on ITO glass via a simple dip coating followed by a hydrothermal growth. The morphological, structural and compositional characteristics of the prepared films were analyzed using X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), and ultraviolet-visible spectroscopy (UV-Vis)...
April 29, 2018: Materials
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