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https://www.readbyqxmd.com/read/28430344/surfactant-assisted-synthesis-of-polyvinylpyrrolidone-hydroxyapatite-composites-as-a-bone-filler
#1
Masoumeh Meskinfam Langroudi, Masoud Giahi Saravani, Azita Nouri
BACKGROUND: Different methods have been used to prepare bone-like composites from inorganic nanoparticles embedded in polymeric matrixes to obtain the properties and structures required for bone fillers. METHODS: Bone-like nano-hydroxyapatite (nHA) was synthesized using a biomimetic method, with polyvinylpyrrolidone (PVP) as template and sodium dodecyl sulfate (SDS) as surfactant. RESULTS: The results demonstrated the formation of HA composites and showed that polymer and surfactant as the polymer capsule can be properly used to control the size, shape, morphology and dispersion of HA crystals...
April 11, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28427615/utilization-of-ultrasonic-irradiation-as-a-green-and-effective-strategy-to-prepare-poly-n-vinyl-2-pyrrolidone-modified-nano-copper-ii-oxide-nanocomposites
#2
Shadpour Mallakpour, Atefeh Jarahiyan
The present paper describes the result of investigations into preparation of novel nanocomposites (NCs) based on poly(N-vinyl-2-pyrrolidone) (PVP) as a biocompatible polymer and modified copper (II) oxide nanoparticles (NPs) as a nano-filler. To achieve optimum NCs properties, different ratios of modified copper (II) oxide NPs (3, 5, and 7wt%) were used to fabricate PVP NCs and also the ultrasonic irradiation was utilized to perform these processes as a fast and effective method. Subsequently, the structure of the obtained nanohybrids was characterized by various techniques...
July 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28425722/giant-electrostrictive-response-and-piezoresistivity-of-emulsion-templated-nanocomposites
#3
Alan Luna, Mickael Pruvost, Jinkai Yuan, Cécile Zakri, Wilfrid Neri, Cecile Monteux, Philippe Poulin, Annie Colin
Using an emulsion road and optimizing the dispersion process, we prepare polymer carbone nanotubes (CNT) and polymer reduced graphene oxyde (rGO) composites. The introduction of conductive nanoparticles into polymer matrices modifies the electronic properties of the material. We show that these materials exhibit giant electrostriction coefficient in the intermediate filler concentration (below 1wt %). This makes them very promising for applications including such as capacitive sensors and actuators. In addition, the values of the piezoresistivity measured in the high filler concentration situation, are at least an order of magnitude greater than the one reported in the literature...
April 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28424498/efficacy-and-safety-of-a-newly-developed-polylactic-acid-microsphere-as-an-injectable-bulking-agent-for-penile-augmentation-18-months-follow-up
#4
D Y Yang, K Ko, S H Lee, D G Moon, J W Kim, W K Lee
Polylactic acid (PLA) fillers are widely used for cosmetic volume augmentation. But, no study has evaluated the use of PLA filler in penile augmentation (PA No. 4). We evaluated the efficacy and safety of a newly developed PLA filler for PA during a 18-month follow-up period. A total of 23 healthy adult men were prospectively enrolled between June and November 2012. Penile girth was measured at proximal-, mid- and distal-shaft at baseline, 3, 6, 12 and 18 months following injection. Subjects' satisfaction was assessed with visual analogue scale (VAS)...
April 20, 2017: International Journal of Impotence Research
https://www.readbyqxmd.com/read/28422061/the-effect-of-particles-on-electrolytically-polymerized-thin-natural-mcf-rubber-for-soft-sensors-installed-in-artificial-skin
#5
Kunio Shimada, Osamu Mochizuki, Yoshihiro Kubota
The aim of this study is to investigate the effect of particles as filler in soft rubber sensors installed in artificial skin. We examine sensors made of natural rubber (NR-latex) that include magnetic particles of Ni and Fe₃O₄ using magnetic compound fluid (MCF). The 1-mm thickness of the electrolytically polymerized MCF rubber makes production of comparatively thin rubber sensors feasible. We first investigate the effect of magnetic particles Ni and Fe₃O₄ on the curing of MCF rubber. Next, in order to adjust the electric properties of the MCF rubber, we adopt Al₂O₃ dielectric particles...
April 19, 2017: Sensors
https://www.readbyqxmd.com/read/28418453/association-of-increasing-nasal-tip-projection-with-lip-position-in-primary-rhinoplasty
#6
Eric W Cerrati, Steven H Dayan
Importance: The effects of rhinoplasty maneuvers on adjacent facial features are an important component in preoperative planning and patient counseling. Tip projection modifications are commonly performed in both cosmetic and reconstructive rhinoplasty. Objective: To evaluate the subsequent change in lip projection that results from increasing nasal tip projection. Design, Setting, and Participants: In this case series, 20 patients underwent primary rhinoplasty with the objective of increasing tip projection during the period from October 1, 2014, to September 25, 2015...
April 13, 2017: JAMA Facial Plastic Surgery
https://www.readbyqxmd.com/read/28417599/high-dielectric-performances-of-flexible-and-transparent-cellulose-hybrid-films-controlled-by-multidimensional-metal-nanostructures
#7
Sangyoon Ji, Jiuk Jang, Eunjin Cho, Si-Hoon Kim, Eun-Seok Kang, Jihoon Kim, Han-Ki Kim, Hoyoul Kong, Sun-Kyung Kim, Ju-Young Kim, Jang-Ung Park
Various wearable electronic devices have been developed for extensive outdoor activities. The key metrics for these wearable devices are high touch sensitivity and good mechanical and thermal stability of the flexible touchscreen panels (TSPs). Their dielectric constants (k) are important for high touch sensitivities. Thus, studies on flexible and transparent cover layers that have high k with outstanding mechanical and thermal reliabilities are essential. Herein, an unconventional approach for forming flexible and transparent cellulose nanofiber (CNF) films is reported...
April 18, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28415495/silver-sulfadiazine-immobilized-glass-as-antimicrobial-fillers-for-dental-restorative-materials
#8
Rohit Srivastava, Yuyu Sun
Bacterial colonization and biofilm formation on dental resin composites cause secondary caries that shortens the service life of dental restorative materials. In this study, commercial barium borosilicate based glass powders, fillers widely used in dental composites, were covalently immobilized with silver sulfadiazine to provide antimicrobial effects. The chemical reactions were followed by FT-IR study, elemental analysis, and energy dispersive spectroscopy (EDS), and the reaction pathway was confirmed by model compound studies...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415487/simultaneous-formation-and-mineralization-of-star-p-eo-stat-po-hydrogels
#9
Martha Schamel, Jürgen Groll, Uwe Gbureck
Natural bone is an organic-inorganic composite of highly ordered collagen fibrils and ~60-70% nanocrystalline hydroxyapatite (HA) crystals resulting in a high fracture resistance for various mechanical loading situations. This study aimed to synthesize highly mineralized hydrogels to mimic the mechanical properties of cancellous bone. A six armed star molecule functionalized with isocyanate groups as reactive termini (NCO-sP(EO-stat-PO)) was used to build up a hydrogel matrix, which was then subsequently mineralized with hydroxyapatite nanocrystals following the hydrolysis of incorporated α-tricalcium phosphate particles...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28415257/effect-of-single-particle-magnetostriction-on-the-shear-modulus-of-compliant-magnetoactive-elastomers
#10
Viktor M Kalita, Andrei A Snarskii, Mikhail Shamonin, Denis Zorinets
The influence of an external magnetic field on the static shear strain and the effective shear modulus of a magnetoactive elastomer (MAE) is studied theoretically in the framework of a recently introduced approach to the single-particle magnetostriction mechanism [V. M. Kalita et al., Phys. Rev. E 93, 062503 (2016)10.1103/PhysRevE.93.062503]. The planar problem of magnetostriction in an MAE with magnetically soft inclusions in the form of a thin disk (platelet) having the magnetic anisotropy in the plane of this disk is solved analytically...
March 2017: Physical Review. E
https://www.readbyqxmd.com/read/28414423/robust-fluorine-free-superhydrophobic-amino-silicone-oil-sio2-modification-of-electrospun-polyacrylonitrile-membranes-for-waterproof-breathable-application
#11
Junlu Sheng, Yue Xu, Jianyong Yu, Bin Ding
Superhydrophobic waterproof-breathable membranes have attracted considerable interest owing to their multifunctional applications in self-cleaning, anti-icing, anticorrosion, outdoor tents, and protective clothing. Despite the researches pertaning to the construction of superhydrophobic functional membranes by nanoparticle finishing have increased drastically, the disconnected particle component is easy to fall off from the membranes under deformation and wear conditions, which has restricted their wide use in practice...
April 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28413588/relative-biocompatibility-of-micro-hybrid-and-nano-hybrid-light-activated-composite-resins
#12
Abiodun Olabisi Arigbede, Bukola Folasade Adeyemi, Omowumi Femi-Akinlosotu
Background. In vitro studies have revealed a direct association between resin content and cytotoxicity of composite resins; however, implantation studies in this regard are sparse. This study investigates the relationship between filler content of composite resins and biocompatibility. Methods. This research employed twelve 180‒200-gr male Wistar rats, 1 nano-hybrid (Prime-Dent Inc.) and 1 micro-hybrid (Medental Inc.) composite resins containing 74% and 80‒90% filler content, respectively. The samples were assessed on the 2nd, 14th and 90th day of implantation...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/28411354/preventing-the-complications-associated-with-the-use-of-dermal-fillers-in-facial-aesthetic-procedures-an-expert-group-consensus-report
#13
REVIEW
Fernando Urdiales-Gálvez, Nuria Escoda Delgado, Vitor Figueiredo, José V Lajo-Plaza, Mar Mira, Francisco Ortíz-Martí, Rosa Del Rio-Reyes, Nazaret Romero-Álvarez, Sofía Ruiz Del Cueto, María A Segurado, Cristina Villanueva Rebenaque
BACKGROUND: The use of dermal fillers in minimally invasive facial aesthetic procedures has become increasingly popular of late, yet as the indications and the number of procedures performed increase, the number of complications is also likely to increase. Paying special attention to specific patient characteristics and to the technique used can do much to avoid these complications. Indeed, a well-trained physician can also minimize the impact of such problems when they do occur. METHODS: A multidisciplinary group of experts in aesthetic treatments reviewed the main factors associated with the complications that arise when using dermal fillers...
April 14, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28409638/a-flexible-solid-composite-electrolyte-with-vertically-aligned-and-connected-ion-conducting-nanoparticles-for-lithium-batteries
#14
Haowei Zhai, Pengyu Xu, Mingqiang Ning, Qian Cheng, Jyotirmoy Mandal, Yuan Yang
Replacing flammable organic liquid electrolytes with solid Li-ion conductors is a promising approach to realize safe rechargeable batteries with high energy density. Composite solid electrolytes, which are comprised of a polymer matrix with ceramic Li-ion conductors dispersed inside, are attractive, since they combine the flexibility of polymer electrolytes and high ionic conductivities of ceramic electrolytes. However, the high conductivity of ceramic fillers is largely compromised by the low conductivity of the matrix, especially when nanoparticles (NPs) are used...
April 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28403361/effect-of-different-composite-core-materials-on-fracture-resistance-of-endodontically-treated-teeth-restored-with-frc-posts
#15
Prapaporn Panitiwat, Prarom Salimee
Objective: This study evaluated the fracture resistance of endodontically treated teeth restored with fiber reinforced composite posts, using three resin composite core build-up materials, (Clearfil Photo Core (CPC), MultiCore Flow (MCF), and LuxaCore Z-Dual (LCZ)), and a nanohybrid composite, (Tetric N-Ceram (TNC)). Material and Methods: Forty endodontically treated lower first premolars were restored with quartz fiber posts (D.T. Light-Post) cemented with resin cement (Panavia F2...
March 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28403269/mid-face-volumization-with-hyaluronic-acid-injection-technique-and-safety-aspects-from-a-controlled-randomized-double-blind-clinical-study
#16
Welf Prager, Karla Agsten, Maria Kravtsov, Prof Martina Kerscher
<p>BACKGROUND: Injection of hyaluronic acid (HA) volumizing fillers in the malar area is intended for rejuvenation of the mid-face. The choice of products, depth, and technique of injection depends on the desired level of volume enhancement and practitioners' preferences.</p> <p>OBJECTIVE: To describe a volumizing injection technique in the scope of a controlled, randomized, double-blind, single-center, split-face clinical study. MATERIALS & METHODS: A total of 45 subjects with bilateral symmetrical moderate to severe volume loss in the malar area received a single 2 mL injection of CPM®-26 (Cohesive Polydensified Matrix®) on one side and VYC®-20 (VYCROSS®) on the contralateral side of the face...
April 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28402731/characterization-of-inorganic-filler-content-mechanical-properties-and-light-transmission-of-bulk-fill-resin-composites
#17
B M Fronza, Apa Ayres, R R Pacheco, F A Rueggeberg, Cts Dias, M Giannini
OBJECTIVES: The aims of this study were to characterize inorganic content (IC), light transmission (LT), biaxial flexural strength (BFS), and flexural modulus (FM) of one conventional (layered) and four bulk-fill composites at different depths. METHODS: Bulk-fill composites tested were Surefil SDR flow (SDR), Filtek Bulk Fill (FBF), Tetric EvoCeram Bulk Fill (TEC), and EverX Posterior (EXP). Herculite Classic (HER) was used as a control. Energy dispersive x-ray analysis and scanning electron microscopy were used to characterize filler particle composition and morphology...
April 12, 2017: Operative Dentistry
https://www.readbyqxmd.com/read/28402626/a-combination-of-boron-nitride-nanotubes-and-cellulose-nanofibers-for-the-preparation-of-a-nanocomposite-with-high-thermal-conductivity
#18
Xiaoliang Zeng, Jiajia Sun, Yimin Yao, Rong Sun, Jian-Bin Xu, Ching-Ping Wong
With the current development of modern electronics toward miniaturization, high-degree integration and multifunctionalization, considerable heat is accumulated, which results in the thermal failure or even explosion of modern electronics. The thermal conductivity of materials has thus attracted much attention in modern electronics. Although polymer composites with enhanced thermal conductivity are expected to address this issue, achieving higher thermal conductivity (above 10 W m(-1) K(-1)) at filler loadings below 50...
April 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28402176/identification-of-bacterial-contaminants-from-calcium-carbonate-filler-production-lines-and-an-evaluation-of-biocide-based-decontamination-procedures
#19
Duško Odić, Jana Prah, Gorazd Avguštin
The aim of this study was to analyze the bacterial community in the production line of a calcium carbonate filler production company and to investigate possible causes for bacterial presence. Throughout 2012, 24 carbonate slurry and six groundwater samples were analyzed. Pseudomonas and Microbacterium were the most frequent contaminants in the slurry, whereas Pseudomonas and Brevundimonas dominated the groundwater samples. Of the 43 different bacterial strains isolated, only five were found both in the slurry and the groundwater, indicating that the latter was not a major source of contamination...
April 12, 2017: Biofouling
https://www.readbyqxmd.com/read/28401757/porous-sio2-hollow-spheres-as-a-solar-reflective-pigment-for-coatings
#20
Zheng Xing, Siok-Wei Tay, Yeap Hung Ng, Liang Hong
This study starts with the synthesis of silica hollow spheres (HSs) by utilizing in situ synthesized polystyrene (PS) microspheres as the template for the deposition of a silica (SiO2) shell, followed by a slow gasification step in air to remove the PS core. The size of HS and the thickness of the porous SiO2 shell are tuned by varying the synthesis conditions of the PS latex and those of the sol-gel deposition, respectively. Various HS powder samples are characterized by ultraviolet-visible-near infrared (UV-vis-NIR) spectroscopy to determine their diffuse reflectance...
April 21, 2017: ACS Applied Materials & Interfaces
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