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https://www.readbyqxmd.com/read/28441494/the-role-of-the-reducing-agent-in-the-electroless-deposition-of-copper-on-functionalized-sams
#1
Ashley Ann Ellsworth, Amy Victoria Walker
Metallized organic layer constructs have a wide range of technological applications. Electroless deposition is an attractive technique by which to deposit metal overlayers because it is inexpensive and can be performed low temperatures compatible with organic materials. Amine borane reducing agents are versatile which are capable of depositing metals, semiconductors and even insulators. We have investigated the role of amine borane reducing agents in the electroless deposition of copper on -CH3, -OH, and -COOH terminated SAMs adsorbed on gold using time-of-flight secondary ion mass spectrometry, optical microscopy and complementary MP2 calculations...
April 25, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28440077/molecular-dynamics-simulations-of-the-standard-leonardite-humic-acid-microscopic-analysis-of-the-structure-and-dynamics
#2
Drazen Petrov, Daniel Tunega, Martin H Gerzabek, Chris Oostenbrink
Humic substances (HS) are abundant in the environment and play an important role in a number of biogeochemical processes including microbial activity, soil aggregation, plant growth, the retention and release of nutrients, the environmental fate of pollutants and carbon storage. They are flexible, relatively small molecules forming supramolecular structures through weak interactions. Despite the great importance of understanding their behavior at the atomic level, computational modeling, a premier high-resolution technique providing great level of detail, has been surprisingly little employed to study humic substances...
April 25, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28439909/effect-of-thermally%C3%A2-deposited-siloxane-methacrylate-coating-on-bonding-to-glass-fibre-posts
#3
F P Silva, A L Faria-E-Silva, R R Moraes, A O Ogliari, G R Reis, A R F Oliveira, M S Menezes
AIM: To evaluate the alterations promoted by a thermally deposited siloxane-methacrylate coating on the surface of glass-fibre posts and its effect on the bond strength of resin-core materials to the posts. METHODOLOGY: Fibre post surfaces were treated with experimental thermally deposited siloxane-methacrylate coatings or clinically available treatments (i.e., hydrogen peroxide and methylene chloride); non-treated posts were used as controls. The contact angles formed between the post surface and the water/adhesive were measured with a tensiometer...
April 25, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/28439578/long-term-bond-strength-of-self-etch-adhesives-to-normal-and-artificially-eroded-dentin-effect-of-relative-humidity-and-saliva-contamination
#4
Fabienne Amsler, Anne Peutzfeldt, Adrian Lussi, Simon Flury
PURPOSE: To investigate the effect of relative humidity and saliva contamination on short- and long-term bond strength of two self-etch adhesives to normal and artificially eroded dentin. MATERIALS AND METHODS: A total of 480 dentin specimens were produced from extracted human molars. Half of the specimens (n = 240) were left untreated (normal dentin) whereas the other half (n = 240) were artificially eroded. The specimens were treated with Clearfil SE Bond (CSE) or Scotchbond Universal (SBU), and composite (Filtek Z250) was applied to the treated dentin surface under four experimental conditions: at a relative humidity of 45% or 85% without/with human saliva contamination...
April 21, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28439577/shear-bond-strength-of-lining-materials-to-calciumsilicate-cements-at-different-time-intervals
#5
Alena Schmidt, Edgar Schäfer, Till Dammaschke
PURPOSE: To compare the shear bond strength of three different light-curing, flowable composites (Ionoseal [IS], Vertise flow [VF], and Futurabond NR + Grandio Flow [GF]) on MTA-Angelus [MTA] or Biodentine [BD] at three different time intervals. MATERIALS AND METHODS: Freshly mixed MTA or BD was applied into 180 identical plaster molds. Three minutes, 15 min, and 2 days after mixing, specimens of IS, VF, and GF with standardized size and diameter were applied on MTA and BD specimens (n = 10 per material and time interval)...
April 21, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28439576/bond-strength-to-eroded-enamel-and-dentin-using-a-universal-adhesive-system
#6
Fabiana Cares Frattes, Marina Gullo Augusto, Carlos Rocha Gomes Torres, Cesar Rogério Pucci, Alessandra Bühler Borges
PURPOSE: To evaluate the influence of previous acid etching on the bond strength of a self-etch universal adhesive system on sound and eroded enamel and dentin. MATERIALS AND METHODS: Flat enamel and dentin surfaces were obtained from bovine incisors (n = 44) and divided into two groups according to the exposure to erosive conditions: sound (without erosion) and eroded (after erosive challenge with 0.3% citric acid, pH 2.6, 5 min, 4x/day, 5 days). Each group was then divided into two subgroups (n = 11) according to the application or not of 37% phosphoric acid before applying a universal self-etch adhesive...
April 21, 2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28438657/the-thiol-of-human-serum-albumin-acidity-microenvironment-and-mechanistic-insights-on-its-oxidation-to-sulfenic-acid
#7
Jenner Bonanata, Lucía Turell, Laura Antmann, Gerardo Ferrer-Sueta, Santiago Botasini, Eduardo Méndez, Beatriz Alvarez, E Laura Coitiño
Human serum albumin (HSA) has a single reduced cysteine residue, Cys34, whose acidity has been controversial. Three experimental approaches (pH-dependence of reactivity towards hydrogen peroxide, ultraviolet titration and infrared spectroscopy) are used to determine that the pKa value in delipidated HSA is 8.1 ± 0.2 at 37°C and 0.1M ionic strength. Molecular dynamics simulations of HSA in the sub-microsecond timescale show that while sulfur exposure to solvent is limited and fluctuating in the thiol form, it increases in the thiolate, stabilized by a persistent hydrogen-bond (HB) network involving Tyr84 and bridging waters to Asp38 and Gln33 backbone...
April 21, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28438559/the-role-of-copper-nanoparticles-in-an-etch-and-rinse-adhesive-on-antimicrobial-activity-mechanical-properties-and-the-durability-of-resin-dentine-interfaces
#8
Mario F Gutiérrez, Pamela Malaquias, Viviane Hass, Thalita P Matos, Lucas Lourenço, Alessandra Reis, Alessandro D Loguercio, Paulo Vitor Farago
OBJECTIVES: To evaluate the effect of addition of copper nanoparticles at different concentrations into an etch-and-rinse adhesive (ER) on antimicrobial activity, Knoop microhardness (KHN), in vitro and in situ degree of conversion (DC), as well as the immediate (IM) and 2-year (2Y) resin-dentine bond strength (μTBS) and nanoleakage (NL). METHODS: Seven experimental ER adhesives were formulated according to the amount of copper nanoparticles incorporated into the adhesives (0 [control], 0...
April 21, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28436672/kinetic-energy-density-as-a-predictor-of-hydrogen-bonded-oh-stretching-frequencies
#9
Joseph R Lane, Anne Schou Hansen, Kasper Mackeprang, Henrik Grum Kjærgaard
This work considers the nature of the intermolecular hydrogen bond in a series of 15 different complexes with OH donor groups and N, O, P or S acceptor atoms. To complement the existing literature, room temperature gas phase vibrational spectra of the methanol-pyridine, ethanol-pyridine and 2,2,2-trifluoroethanol-pyridine complexes were recorded. These complexes were chosen as they exhibit hydrogen bonds of intermediate strength as compared to previous investigations that involved strong or weak hydrogen bonds...
April 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28436661/performance-of-van-der-waals-corrected-functionals-for-guest-adsorption-in-the-m2-dobdc-metal-organic-frameworks
#10
Bess Vlaisavljevich, Johanna M Huck, Zeric Hulvey, Kyuho Lee, Jarad A Mason, Jeffrey B Neaton, Jeffrey R Long, Craig M Brown, Dario Alfè, Angelos Michaelides, Berend Smit
Small molecule binding in metal-organic frameworks (MOFs) can be accurately studied both experimentally and computationally, provided the proper tools are employed. Herein, we compare and contrast properties associated with guest binding by means of density functional theory (DFT) calculations using nine different functionals for the M2(dobdc) (dobdc4- = 2,5-dioxido,1,4-benzenedicarboxylate) series where M = Mg, Mn, Fe, Co, Ni, Cu, and Zn. Additionally, we perform Quantum Monte Carlo (QMC) calculations for one system to determine if this method can be used to assess the performance of DFT...
April 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28436311/role-of-6-mercaptopurine-in-the-potential-therapeutic-targets-dna-base-pairs-and-g-quadruplex-dna-insights-from-quantum-chemical-and-molecular-dynamics-simulations
#11
R Radhika, R Shankar, S Vijayakumar, P Kolandaivel
The theoretical studies on DNA with the anticancer drug 6-Mercaptopurine (6-MP) are investigated using theoretical methods to shed light on drug designing. Among the DNA base pairs considered, 6-MP is stacked with GC with the highest interaction energy of -46.19 kcal/mol. Structural parameters revealed that structure of the DNA base pairs is deviated from the planarity of the equilibrium position due to the formation of hydrogen bonds and stacking interactions with 6-MP. These deviations are verified through the systematic comparison between X-H bond contraction and elongation and the associated blue shift and red shift values by both NBO analysis and vibrational analysis...
April 24, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28435943/influence-of-charged-defects-on-the-interfacial-bonding-strength-of-tantalum-and-silver-doped-nanograined-tio2
#12
Jalal Azadmanjiri, James Wang, Christopher C Berndt, Ajay Kapoor, De Ming Zhu, Andrew S M Ang, Vijay K Srivastava
A nano-grained layer including line defects was formed on the surface of a Ti alloy (Tialloy, Ti-6Al-4V ELI). Then, the micro- and nano-grained Tialloy with the formation of TiO2 on its top surface was coated with a bioactive Ta layer with or without incorporating an antibacterial agent of Ag that was manufactured by magnetron sputtering. Subsequently, the influence of the charged defects (the defects that can be electrically charged on the surface) on the interfacial bonding strength and hardness of the surface system was studied via an electronic model...
April 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28435623/influence-of-nano-structured-alumina-coating-on-shear-bond-strength-between-y-tzp-ceramic-and-various-dual-cured-resin-cements
#13
Jung-Jin Lee, Jung-Yun Choi, Jae-Min Seo
PURPOSE: The purpose of this study was to evaluate the effect of nano-structured alumina surface coating on shear bond strength between Y-TZP ceramic and various dual-cured resin cements. MATERIALS AND METHODS: A total of 90 disk-shaped zirconia specimens (HASS CO., Gangneung, Korea) were divided into three groups by surface treatment method: (1) airborne particle abrasion, (2) tribochemicalsilica coating, and (3) nano-structured alumina coating. Each group was categorized into three subgroups of ten specimens and bonded with three different types of dual-cured resin cements...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28435621/the-effect-of-plasma-on-shear-bond-strength-between-resin-cement-and-colored-zirconia
#14
Chan Park, Seung-Hwan Yoo, Sang-Won Park, Kwi-Dug Yun, Min-Kyung Ji, Jin-Ho Shin, Hyun-Pil Lim
PURPOSE: To investigate the effect of non-thermal atmospheric pressure plasma (NTAPP) treatment on shear bond strength (SBS) between resin cement and colored zirconia made with metal chlorides. MATERIALS AND METHODS: 60 zirconia specimens were divided into 3 groups using coloring liquid. Each group was divided again into 2 sub-groups using plasma treatment; the experimental group was treated with plasma, and the control group was untreated. The sub-groups were: N (non-colored), C (0...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28435620/the-effect-of-resin-cement-type-and-cleaning-method-on-the-shear-bond-strength-of-resin-cements-for-recementing-restorations
#15
Roodabeh Koodaryan, Ali Hafezeqoran, Amin Khakpour Maleki
PURPOSE: This laboratory study assessed the effect of different dentin cleaning procedures on shear bond strength of resin cements for recementing prosthesis. MATERIALS AND METHODS: 4 × 4 flat surface was prepared on the labial surface of 52 maxillary central incisors. Metal frames (4 × 4 × 1.5 mm) were cast with nickel-chromium alloy. All specimens were randomly divided into 2 groups to be cemented with either Panavia F2.0 (P) or RelyX Ultimate (U) cement. The initial shear bond strength was recorded by Universal Testing Machine at a crosshead speed of 0...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28435616/tooth-surface-treatment-strategies-for-adhesive-cementation
#16
Nadja Rohr, Jens Fischer
PURPOSE: The aim of this study was to evaluate the effect of tooth surface pre-treatment steps on shear bond strength, which is essential for understanding the adhesive cementation process. MATERIALS AND METHODS: Shear bond strengths of different cements with various tooth surface treatments (none, etching, priming, or etching and priming) on enamel and dentin of human teeth were measured using the Swiss shear test design. Three adhesives (Permaflo DC, Panavia F 2...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28435615/effect-of-zirconia-surface-treatment-using-nitric-acid-hydrofluoric-acid-on-the-shear-bond-strengths-of-resin-cements
#17
Jin Hyung Cho, Sun Jai Kim, June Sung Shim, Keun-Woo Lee
PURPOSE: The aim of this study was to compare the surface roughness of zirconia when using Zircos E etching system (ZSAT), applying a nitric acid-hydrofluoric acid compound as a pretreatment agent, and also to compare the shear bonding strength according to different resin cements. MATERIALS AND METHODS: ZSAT, air abrasion, and tribochemical silicacoating were applied on prepared 120 zirconia specimens (10 mm in diameter, 7 mm in height) using CAD/CAM. Each 12 specimens with 4 different resin cements (Panavia F 2...
April 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28435367/-ormocer-an-innovative-technology-a-replacement-for-conventional-cements-and-veneer-a-comparative-in-vitro-analysis
#18
Vini Rajeev, Rajeev Arunachalam, Sanjna Nayar, P R Arunima, Sivadas Ganapathy, Vaishnavi Vedam
OBJECTIVE: This in vitro study was designed to assess shear bond strength (SBS) of ormocer flowable (OF) resin as a luting agent, ormocer as an indirect veneer material with portrayal of modes of failures using scanning electron microscope (SEM). MATERIALS AND METHODS: Sixty maxillary central incisors were divided into Group I, II, and III with 20 samples each based on luting cement used. They were OF, self-adhesive (SA) cement, and total etch (TE) cement. These groups were subdivided into "a" and "b" of ten each based on the type of veneering materials used...
January 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28435358/effect-of-cleaning-agent-primer-application-and-their-combination-on-the-bond-strength-of-a-resin-cement-to-two-yttrium-tetragonal-zirconia-polycrystal-zirconia-ceramics
#19
William Matthew Negreiros, Glaucia Maria Bovi Ambrosano, Marcelo Giannini
OBJECTIVE: The objective of this study is to evaluate the effect of a cleaning agent and priming on the bond strength (BS) of a resin cement (RC) to zirconia ceramics after 24 h and 1 year of water-storage. MATERIALS AND METHODS: Fifty-six Katana and 56 ZirCAD zirconia ceramic plates were prepared and each zirconia brand was divided into four groups (n = 14): (1) untreated; (2) treated with Ivoclean cleaning agent; (3) treated with Monobond Plus coupling agent; (4) treated with Ivoclean + Monobond Plus...
January 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28435077/improving-blend-content-uniformity-via-dry-particle-coating-of-micronized-drug-powders
#20
Zhonghui Huang, Wannan Xiong, Kuriakose Kunnath, Sayani Bhaumik, Rajesh N Davé
Content uniformity of low dose blends with fine active pharmaceutical ingredients (API) is adversely impacted due to API agglomeration caused by high powder cohesion. Dry coating using high-intensity vibratory mixing is employed to reduce API cohesion and granular Bond number as well as agglomeration as predicted by contact models, hence improve blend content uniformity (CU). Micronized acetaminophen (mAPAP) (~10μm), a model API, was dry coated with nano-silica R972P (20nm), and mixed with Avicel 102. The amount of silica was varied from 0 to 2...
April 20, 2017: European Journal of Pharmaceutical Sciences
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