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https://www.readbyqxmd.com/read/28429011/drop-transport-and-positioning-on-lubricant-impregnated-surfaces
#1
Jian Hui Guan, Élfego Ruiz-Gutiérrez, Ben Bin Xu, David Wood, Glen McHale, Rodrigo Ledesma-Aguilar, Gary George Wells
We demonstrate the transport and positioning of water droplets on macro-patterned lubricant-impregnated surfaces. The macro-patterning produces menisci features in the impregnating liquid layer which interact with a droplet via a capillary mechanism similar to the Cheerios effect. These interactions control the droplet motion and positioning on an otherwise completely slippery surface. We present experimental results using a V-shape channel geometry as a model system. The interaction between deformations on the lubricant layer induced by the droplet and the underlying V-shape geometry leads to both local and global equilibrium positions for the droplet within the channel...
April 21, 2017: Soft Matter
https://www.readbyqxmd.com/read/28426674/tribological-investigations-of-the-load-temperature-and-time-dependence-of-wear-in-sliding-contact
#2
Matthew David Marko, Jonathan P Kyle, Yuanyuan Sabrina Wang, Elon J Terrell
An effort was made to study and characterize the evolution of transient tribological wear in the presence of sliding contact. Sliding contact is often characterized experimentally via the standard ASTM D4172 four-ball test, and these tests were conducted for varying times ranging from 10 seconds to 1 hour, as well as at varying temperatures and loads. A numerical model was developed to simulate the evolution of wear in the elastohydrodynamic regime. This model uses the results of a Monte Carlo study to develop novel empirical equations for wear rate as a function of asperity height and lubricant thickness; these equations closely represented the experimental data and successfully modeled the sliding contact...
2017: PloS One
https://www.readbyqxmd.com/read/28426217/phosphorus-depletion-as-a-green-alternative-to-biocides-for-controlling-biodegradation-of-metalworking-fluids
#3
Yaldah Azimi, Ian P Thompson
Metalworking fluids (MWFs) are used as lubricants and coolants in the manufacturing operations. Their biodeterioration, whilst in-operation, is a widespread problem leading to poor performance and worker health issues. Adding biocides, though effective in reducing microbial growth, leads to the production of more recalcitrant wastewaters that are difficult to dispose or recycle on-site. Increasing environmental concerns have led to robust legislation for reducing/eliminating the use of toxic biocides in MWFs, stimulating a growing interest in the development/application of alternative biological preservation strategies...
April 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28422804/a-review-of-ocular-graft-versus-host-disease
#4
Saleha Z Munir, James Aylward
: Graft-versus-host disease (GVHD) is a major complication that occurs following allogeneic hematopoietic stem cell transplantation, which is a potential curative therapy used in a variety of malignant or benign hematological diseases. Graft-versus-host disease primarily occurs in many organs, but most notably in the skin, lungs, gastrointestinal tract, liver, eyes, mucosa, and musculoskeletal system. Ocular manifestations of GVHD may precede other systemic GVHD findings, and it may be a poor prognosis for mortality...
May 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28422196/boundary-layer-friction-of-solvate-ionic-liquids-as-a-function-of-potential
#5
Hua Li, Mark W Rutland, Masayoshi Watanabe, Rob Atkin
Atomic force microscopy (AFM) has been used to investigate the potential dependent boundary layer friction at solvate ionic liquid (SIL)-highly ordered pyrolytic graphite (HOPG) and SIL-Au(111) interfaces. Friction trace and retrace loops of lithium tetraglyme bis(trifluoromethylsulfonyl)amide (Li(G4) TFSI) at HOPG present clearer stick-slip events at negative potentials than at positive potentials, indicating that a Li(+) cation layer adsorbed to the HOPG lattice at negative potentials which enhances stick-slip events...
April 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28419912/the-mucosal-pellicle-an-underestimated-factor-in-oral-physiology
#6
REVIEW
Christian Hannig, Matthias Hannig, Anna Kensche, Guy Carpenter
Bioadhesion and bio-adsorption of proteins, glycoproteins and other biomolecules are ubiquitous phenomena in the oral cavity. While the protective role of the adsorbed salivary biomolecules on teeth (the acquired enamel pellicle) is well established, it has yet to be defined whether comparable processes occur on the desquamating oral soft tissues. The general term for these layers is pellicle, but due to the different characteristics of the coated surfaces the enamel pellicle and mucosal pellicle are their own entities...
April 8, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28419911/safety-and-long-term-efficacy-of-fractional-co2-laser-treatment-in-women-suffering-from-genitourinary-syndrome-of-menopause
#7
Fariba Behnia-Willison, Sara Sarraf, Joseph Miller, Behrang Mohamadi, Alison S Care, Alan Lam, Nadia Willison, Leila Behnia, Stefano Salvatore
OBJECTIVES: To evaluate the safety and long-term efficacy of fractional CO2 laser treatment in reducing the severity of symptoms of genitourinary syndrome of menopause (GSM) in menopausal women. STUDY DESIGN: 102 women presenting with symptomatic GSM were treated with the fractional CO2 laser (MonaLisa Touch, DEKA) system across a series of treatments delivered at intervals of six or more weeks. The Australian Pelvic Floor Questionnaire was used to gather data on sexual function and side-effects at three time-points across the study period (prospective panel design study)...
April 2, 2017: European Journal of Obstetrics, Gynecology, and Reproductive Biology
https://www.readbyqxmd.com/read/28419471/spectral-analysis-of-the-stick-slip-phenomenon-in-oral-tribological-texture-evaluation
#8
Solange Sanahuja, Rutuja Upadhyay, Heiko Briesen, Jianshe Chen
"Oral" tribology has become a new paradigm in food texture studies to understand complex texture attributes, such as creaminess, oiliness, and astringency, which could not be successfully characterized by traditional texture analysis nor by rheology. Stick-slip effects resulting from intermittent sliding motion during kinetic friction of oral mucosa could constitute an additional determining factor of sensory perception where traditional friction coefficient values and their Stribeck regimes fail in predicting different lubricant (food bolus and saliva) behaviors...
March 28, 2017: Journal of Texture Studies
https://www.readbyqxmd.com/read/28418159/toxicity-of-sediment-associated-substituted-phenylamine-antioxidants-on-the-early-life-stages-of-pimephales-promelas-and-a-characterization-of-effects-on-freshwater-organisms
#9
Ryan S Prosser, Joanne L Parrott, Melissa Galicia, Kallie Shires, Cheryl Sullivan, John Toito, Adrienne J Bartlett, Danielle Milani, Patty L Gillis, Vimal K Balakrishnan
Substituted phenylamine antioxidants (SPAs) are high production volume chemicals that are incorporated into a variety of commercial products (e.g., polymers, dyes, lubricants). There are little data on chronic toxicity of SPAs to fish and no data on the toxicity of SPAs to the early-life stages of fish. The physicochemical properties of SPAs would suggest that if they were to enter an aquatic ecosystem they would partition into sediment. Therefore, the current study focused on investigating the chronic effect of sediment-associated SPAs to the early-life stages of the fathead minnow (Pimephales promelas)...
April 18, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/28415468/characterization-of-the-surface-physico-chemistry-of-plasticized-pvc-used-in-blood-bag-and-infusion-tubing
#10
H Al Salloum, J Saunier, A Dazzi, J Vigneron, A Etcheberry, C Marlière, C Aymes-Chodur, J M Herry, M Bernard, E Jubeli, N Yagoubi
Commercial infusion tubing and blood storage devices (tubing, blood and platelets bags) made of plasticized PVC were analyzed by spectroscopic, chromatographic and microscopic techniques in order to identify and quantify the additives added to the polymer (lubricants, thermal stabilizers, plasticizers) and to put into evidence their blooming onto the surface of the devices. For all the samples, deposits were observed on the surface but with different kinds of morphologies. Ethylene bis amide lubricant and metallic stearate stabilizers were implicated in the formation of these layers...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415466/effect-of-lubricant-on-the-reliability-of-dental-implant-abutment-screw-joint-an-in-vitro-laboratory-and-three-dimension-finite-element-analysis
#11
Tingting Wu, Hongyi Fan, Ruiyang Ma, Hongyu Chen, Zhi Li, Haiyang Yu
Biomechanical factors play a key role in the success of dental implants. Fracture and loosening of abutment screws are major issues. This study investigated the effect of lubricants on the stability of dental implant-abutment connection. As lubricants, graphite and vaseline were coated on the abutment screw surface, respectively, and a blank without lubricant served as the control. The total friction coefficient (μtot), clamping force, fatigue behavior and detorque of the joint combined with dynamic cyclic loading were measured under different lubricating conditions...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28411499/characteristics-and-environmental-fate-of-the-anionic-surfactant-sodium-lauryl-ether-sulphate-sles-used-as-the-main-component-in-foaming-agents-for-mechanized-tunnelling
#12
REVIEW
Anna Barra Caracciolo, Martina Cardoni, Tanita Pescatore, Luisa Patrolecco
The anionic surfactant sodium lauryl ether sulphate (SLES) is the main component of most commercial products used for soil conditioning in the excavation industry, in particular as lubricants for mechanized tunnelling. Its use during the excavation processes can result in either the subsequent possible re-use of the huge amount of soil debris as by-products (e.g. land covering) or its discharge as waste. Currently, there are neither SLES soil threshold limits in European legislation, nor comprehensive studies on the environmental risk for soil ecosystems in these exposure scenarios...
April 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28410443/molecular-characterization-of-volatiles-and-petrochemical-base-oils-by-photo-ionization-gc%C3%A3-gc-tof-ms
#13
Anupam Giri, Marion Coutriade, Amandine Racaud, Koji Okuda, A John Dane, Robert Bernard Cody, Jean-François Focant
The characterization of organic mixtures by comprehensive two-dimensional gas chromatography (GC×GC) coupled to electron impact (EI) ionization time-of-flight mass spectrometry (TOF-MS) allows the detection of thousands of compounds. However, owing to the exhaustive fragmentation following EI ionization, despite the use of mass spectral libraries, a majority of the compounds remains unidentified because of the lack of parent ion preservation. Thus, soft-ionization energies leading to organic compounds being ionized with limited or no fragmentation, retaining the molecular ion, has been of interest for many years...
April 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28407163/effect-of-topical-nonsteroidal-anti-inflammatory-drugs-on-pupillary-size-during-uncomplicated-cataract-surgery
#14
Alejandro Rodríguez-García, Julio C Hernández-Camarena, Gilberto R López-Jaime, José A Nava-García
PURPOSE: To compare the effectiveness of three different topical nonsteroidal anti-inflammatory drugs (NSAIDs) in inhibiting surgically induced miosis during uncomplicated cataract phacoemulsification. METHODS: Prospective, randomized, double-masked comparative study of patients aged 40 years or older with grades II to III cataracts (Lens Opacities Classification System) and no other comorbidities. Participants were randomized into four groups: 0.1% nepafenac, 0...
April 1, 2017: Journal of Refractive Surgery
https://www.readbyqxmd.com/read/28406578/production-of-biomass-based-automotive-lubricants-via-reductive-etherification
#15
Alexis T Bell, Deepak Jadhav, Adam A Grippo, Sankaranaryanapillai Shyles, Amit A Gokhale, John Redshaw
Growing concern with the effects of CO2 emissions due to the combustion of petroleum-based transportation fuels has motivated the search for means to increase engine efficiency. The discovery of ethers with low viscosity presents an important opportunity to improve engine efficiency and fuel economy. We show here a strategy for the catalytic synthesis of such ethers via reductive etherification/O-alkylation of alcohols using building blocks that can be sourced from biomass. We find that long chain branched ethers have several properties that make them superior lubricants to the mineral oil and synthetic base oils used today...
April 12, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28406512/on-the-lubricity-of-transition-metal-dichalcogenides-an-ab-initio-study
#16
Benjamin J Irving, Paolo Nicolini, Tomas Polcar
Owing to specific characteristics engendered by their lamellar structures, transition metal dichalcogenides are posited as being some of the best dry lubricants available. Herein, we report a density functional investigation into the sliding properties and associated phenomena of these materials. Calculated potential energy and charge transfer profiles are used to highlight the dependence of shear strength on chemical composition and bilayer orientation (sliding direction). Furthermore, our calculations underscore the intrinsic relationship between incommensurate crystals and the oft-touted superlubric behaviour of molybdenum disulfide...
April 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28405373/bioinspired-polymer-microstructures-for-directional-transport-of-oily-liquids
#17
C Plamadeala, F Hischen, R Friesenecker, R Wollhofen, J Jacak, G Buchberger, E Heiss, T A Klar, W Baumgartner, J Heitz
Nature has always served as an inspiration for scientists, helping them to solve a large diversity of technical problems. In our case, we are interested in the directional transport of oily liquids and as a model for this application we used the flat bug Dysodius lunatus. In this report, we present arrays of drops looking like polymer microstructures produced by the two-photon polymerization technique that mimic the micro-ornamentation from the bug's cuticle. A good directionality of oil transport was achieved, directly controlled by the direction of the pointed microstructures at the surface...
March 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28403917/-contraception-during-perimenopause-the-spermicides-option
#18
REVIEW
D Serfaty
AIM: In perimenopause, the increased cardiovascular and cancer risk and the increased incidence of gynaecologic disorders have a major impact on the choice of an appropriate contraceptive method. The aim of this review is to assess the potential benefit of spermicides at this stage of woman's life. MATERIALS AND METHODS: This review presents the eligibility criteria of the different contraceptive methods according to national and international guidelines, together with a literature review of the efficacy and side-effects of the two major spermicidal preparations, benzalkonium chloride and nonoxynol-9, with specific focus on the over-40 age group...
March 2017: J Gynecol Obstet Hum Reprod
https://www.readbyqxmd.com/read/28403193/sexual-function-and-satisfaction-among-heterosexual-and-sexual-minority-u-s-adults-a-cross-sectional-survey
#19
Kathryn E Flynn, Li Lin, Kevin P Weinfurt
BACKGROUND: Despite known health disparities for sexual minorities, few studies have described sexual function by sexual orientation using a robust approach to measurement of sexual function. We compared recent sexual function and satisfaction by sexual orientation among English-speaking US adults. METHODS AND FINDINGS: Cross-sectional surveys were administered by KnowledgePanel® (GfK), an online panel that uses address-based probability sampling and is representative of the civilian, noninstitutionalized US population...
2017: PloS One
https://www.readbyqxmd.com/read/28401962/diamond-like-carbon-coating-under-oleic-acid-lubrication-evidence-for-graphene-oxide-formation-in-superlow-friction
#20
Maria Isabel De Barros Bouchet, Jean Michel Martin, José Avila, Makoto Kano, Kentaro Yoshida, Takeshi Tsuruda, Shandan Bai, Yuji Higuchi, Nobuki Ozawa, Momoji Kubo, Maria C Asensio
The achievement of the superlubricity regime, with a friction coefficient below 0.01, is the Holy Grail of many tribological applications, with the potential to have a remarkable impact on economic and environmental issues. Based on a combined high-resolution photoemission and soft X-ray absorption study, we report that superlubricity can be realized for engineering applications in bearing steel coated with ultra-smooth tetrahedral amorphous carbon (ta-C) under oleic acid lubrication. The results show that tribochemical reactions promoted by the oil lubrication generate strong structural changes in the carbon hybridization of the ta-C hydrogen-free carbon, with initially high sp(3) content...
April 12, 2017: Scientific Reports
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