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Yi Zhu, Ilja L Kruglikov, Yucel Akgul, Philipp E Scherer
Hyaluronic acid (HA, also known as hyaluronan), is a non-sulfated linear glycosaminoglycan polymer consisting of repeating disaccharide units of d-glucuronic acid and N-acetyl-d-glucosamine abundantly present in the extracellular matrix. The sizes of hyaluronic acid polymers range from 5000 to 20,000,000 Da in vivo, and the functions of HA are largely dictated by its size. Due to its high biocompatibility, HA has been commonly used as soft tissue filler as well as a major component of biomaterial scaffolds in tissue engineering...
February 16, 2018: Matrix Biology: Journal of the International Society for Matrix Biology
Gedalias Custódio Martim, Vicente Lira Kupfer, Murilo Pereira Moisés, Andressa Dos Santos, Paulo Henrique Maciel Buzzetti, Andrelson Wellington Rinaldi, Adley Forti Rubira, Emerson Marcelo Girotto
The aim of this study was to synthesize and characterize mesoporous materials SBA-15 and SBA-15 modified with 3-(methacryloxy)-propyl-trimethoxysilane (MPS) to be used as inorganic filler in restorative dental composites and adhesives, and evaluate the main physical-chemical properties of the resulting material. The SBA-15 and SBA-15/MPS were characterized by FTIR, BET and X-Ray and combined with TEGDMA, bis-GMA and commercial spherical silica to produce dental composites. Afterwards, the mesoporous materials were combined with TEGDMA, bis-GMA and HEMA to make adhesives...
February 9, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Todd A Stueckle, Donna C Davidson, Ray Derk, Tiffany G Kornberg, Lori Battelli, Sherri Friend, Marlene Orandle, Alixandra Wagner, Cerasela Zoica Dinu, Konstantinos A Sierros, Sushant Agarwal, Rakesh K Gupta, Yon Rojanasakul, Dale W Porter, Liying Rojanasakul
Organomodified nanoclays (ONCs) are increasingly used as filler materials to improve nanocomposite strength, wettability, flammability, and durability. However, pulmonary risks associated with exposure along their chemical lifecycle are unknown. This study's objective was to compare pre- and post-incinerated forms of uncoated and organomodified nanoclays for potential pulmonary inflammation, toxicity, and systemic blood response. Mice were exposed via aspiration to low (30 µg) and high (300 µg) doses of pre-incinerated uncoated montmorillonite nanoclay (CloisNa), ONC (Clois30B), their respective incinerated forms (I-CloisNa and I-Clois30B), and crystalline silica (CS)...
February 16, 2018: ACS Nano
Yujuan Niu, Feng Xiang, Yifei Wang, Jie Chen, Hong Wang
Surface modification on nanoparticle fillers with organic groups is important to improve the performance of ceramic/polymer nanocomposites. Due to the small coverage level of carboxylic acids on the nanoparticle surface, studies on the use of carboxylic acids as a surface modifier for ceramic nanoparticles have been rarely reported. However, there is no study that proves that a small amount of modifier on the surface of nanoparticles cannot adequately improve the dispersion as well as the compatibility of nanoparticles with the matrix...
February 16, 2018: Physical Chemistry Chemical Physics: PCCP
Jun Gyu Lee, Tae Whan Kim
Three-dimensional (3D) NAND flash memory devices having a poly-silicon channel with grain boundaries, the cylindrical macaroni channel being outside the inter-oxide filler layer and inside the tunneling oxide layer, were evaluated. The effects of the grain size, grain boundary trap density, and interface trap density at the interfaces between the channel and the oxide layers on the electrical characteristics of 3D NAND flash memory devices were investigated. The electron density of the channel was changed depending on the grain boundary trap density and the position of the grain boundary trap in the channel...
March 1, 2018: Journal of Nanoscience and Nanotechnology
S Uma Maheshwari, K Govindan, M Raja, A Raja, M B S Pravin, S Vasanth Kumar
β Tricalcium phosphate ceramic was used to reinforce nanofibers in composite mats produced via electrospinning of poly(vinyl alcohol) (PVA), polycaprolactone (PCL) and (PVA: PCL) bilayers. The role of TCP ceramic on morphology of nanocomposites, crystalline structure, functional groups and thermal behaviour of nanocomposites were characterized by SEM, EDAX, XRD, FTIR and DSC analysis. Ultrathin cross-sections of the obtained nanocomposites were morphologically investigated with SEM and all fabricated composites consisted of fibers with average fiber diameter (AFD) around 100 nm except PCL-TCP fibers having AFD in the range of 608 nm...
March 1, 2018: Journal of Nanoscience and Nanotechnology
Maila Castellano, Antonio Turturro, Elisabetta Finocchio, Guido Busca, Rossella Di Legami, Silvia Vicini
Silica nanoparticles with different aspect ratios (A.R.) were tested as reinforcing fillers of styrenebutadiene copolymer (s-SBR) for "green tyres," i.e., tires with lower rolling resistance. A commercial nanosilica with A.R. = 1 (Aerosil® 200) was compared with two nanosilica samples with A.R. = 2 and 4, synthesized by means of an innovative process, to ascertain if the filler shape was significant to improve the composite properties. In addition, bis-triethoxysilylpropyltetrasulfide was grafted onto the particles surface, in order to obtain more hydrophobic materials and to enhance their dispersion in the elastomeric composites: pristine and modified silicas were then compared...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Pravin Jagdale, Samera Salimpour, Md Hujjatul Islam, Fabio Cuttica, Francisco C Robles Hernandez, Alberto Tagliaferro, Alberto Frache
Polydimethylsiloxane has exceptional fire retardancy characteristics, which make it a popular polymer in flame retardancy applications. Flame retardancy of polydimethylsiloxane with different nano fillers was studied. Polydimethylsiloxane composite fire property varies because of the shape, size, density, and chemical nature of nano fillers. In house made carbon and bismuth oxide nano fillers were used in polydimethylsiloxane composite. Carbon from biochar (carbonised bamboo) and a carbon by-product (carbon soot) were selected...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Marcello Casa, Maria Sarno, Rosalba Liguori, Claudia Cirillo, Alfredo Rubino, Emanuele Bezzeccheri, Johan Liu, Paolo Ciambelli
Decoration with silver nanoparticles was obtained by coating graphene with a polydopamine layer, able to induce spontaneous metallic nanoparticles formation without any specific chemical interfacial modifier, neither using complex instrumentation. The choice of dopamine was inspired by the composition of adhesive proteins in mussels, related to their robust attach to solid surfaces. The synthesis procedure started from graphite and involved eco-friendly compounds, such as Vitamin C and glucose as reducing agent and water as reaction medium...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Laura Sisti, Grazia Totaro, Micaela Vannini, Loris Giorgini, Simone Ligi, Annamaria Celli
Bio-based polyamide 11 (PA11)-graphene nanocomposites with different filler concentrations (0.25, 0.5, 0.75, 1.5 and 3 wt%) were prepared by In Situ polymerization starting from a water dispersed suspension of graphene nanoplatelets. The effects of the incorporation of the filler were studied in terms of molecular, morphological, thermal and dynamic mechanical properties of the final materials. During the crystallization process from the melt, the filler induces a notable nucleating effect even if the crystal growth rate tends to decrease...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Heidy Cruz, Younggon Son
Since the discovery of carbon nanotubes (CNT), significant research works have focused on the application of CNT as conductive filler to polymer nanocomposites which can be used in several fields such as electrostatic dissipation (ESD), electrostatic painting and electromagnetic interference shielding (EMI-shielding). However, the main challenge in the large-scale manufacturing of this technology is the poor electrical conductivity of polymer nanocomposites produced by injection molding process. This study aims to investigate the effect of CNT aspect ratio in improving the electrical conductivity of injection molded nanocomposites...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Kyung-Hyeon Yoo, Hoon-Sang Cho, Dong-Hyun Kim, Jong Kook Lee, Kim Yong-Il, Kyu-Hong Hwang, Seog-Young Yoon
Organic/inorganic biocomposite materials for biodegradable fixation medical devices require osteoconductivity, biocompatibility, and adequate mechanical properties with biodegradation behavior. The objective of this study was to investigate the effect of Si ions substituted in β-tricalcium phosphate (β-TCP) on the mechanical properties of organic/inorganic biocomposites. Biodegradable composite materials were prepared with polylactic acid (PLA) as the matrix and nano Si-substituted β-TCP as the osteoconductive filler by solvent mixing and conventional molding...
February 1, 2018: Journal of Nanoscience and Nanotechnology
Jinsu Park, Bae-Jung Kim, Ji-Yeong Hwang, Yo-Woong Yoon, Hoon-Sang Cho, Dong-Hyun Kim, Jong Kook Lee, Seog-Young Yoon
Osteoconductive, biocompatible, and resorbable organic/inorganic composites are most commonly used in fixation medical devices, such as suture anchors and interference screws, because of their unique physical and chemical properties. Generally, studies on biodegradable composites have focused on their mechanical properties based on the composition and the individual roles of organic and inorganic biomaterials. In this study, we prepared biodegradable organic/inorganic nanocomposite materials using the solvent mixing process and conventional molding...
February 1, 2018: Journal of Nanoscience and Nanotechnology
José Thiers Carneiro Júnior, Paulo Hemerson de Moraes, Douglas Voss de Oliveira, Nayara Cristina Monteiro Carneiro
Patients with considerable maxillomandibular anteroposterior discrepancies and maxillary hypoplasia require corrective treatment through orthognathic surgery. However, in the treatment of severe maxillary retrognathism, it is necessary to reconstruct areas of bone deficiency through grafting techniques in addition to maxillary advancement using only the Le Fort I osteotomy. Treatment in these patients is more challenging and requires high surgical predictability. Alloplastic materials often have been used for the reconstruction of poor bone contours...
January 31, 2018: Journal of Oral and Maxillofacial Surgery
Cressa Ria P Fulong, Junyi Liu, Vincent J Pastore, Haiqing Lin, Timothy R Cook
Discrete metal-organic polyhedra (MOPs) containing copper(ii), palladium(ii), and iron(ii) nodes were synthesized as fillers for mixed-matrix materials (MMMs) with a polyvinylidine fluoride (PVDF) polymer phase and contrasted against an MMM containing a metal-organic framework, MOF-5. When a given MOP was soluble in the precursor solutions, the resulting MMMs were thin, flexible, and homogeneous based on microscopy and SEM imaging. Analogous MMM formation using either insoluble MOPs or the inherent insoluble MOF-5 showed a higher degree of phase separation and inhomogeneity...
February 15, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Hao Zhang, Jing-Sheng Liu, He-Xin Zhang, Eun-Bin Ko, Jae-Hyeong Park, Young-Kwon Moon, Byeong-Kwang Shin, Xue-Quan Zhang, Keun-Byoung Yoon
A facile coagglomeration method for preparing a long alkyl chain modified graphene oxide (MGO)/MgCl2-supported Ti-based Ziegler-Natta catalyst was reported. The effects of MGO on the catalyst morphology and activity for ethylene polymerization were examined. The resultant polyethylene (PE)/MGO nanocomposites exhibited a layered morphology, with the MGO fillers being well dispersed and exhibiting strong interfacial adhesion to the PE matrix. The thermal stability and mechanical properties of the PE were significantly enhanced with the introduction of a small amount of the MGO filler...
April 1, 2018: Journal of Nanoscience and Nanotechnology
Xi Yang, Xiaoyan Yu, Kimiyoshi Naito, Huili Ding, Xiongwei Qu, Qingxin Zhang
A new thermally conductive and electrically insulative polyimide were prepared by filling different amounts of hexagonal boron nitride (h-BN) particles, and the thermal conductivity of Polyimide (PI) composites were improved with the increasing h-BN content. Based on this, two methods were applied to improve thermal conductivity furtherly at limited filler loading in this paper. One is modifying the h-BN to improve interface interaction, another is fabricating a nano-micro hybrid filler with 2-D h-BN and 0-D nano-scale nanodiamond (ND) to build more effective conductive network...
May 1, 2018: Journal of Nanoscience and Nanotechnology
Bhagabat Bhuyan, Suneel Kumar Srivastava, Vikas Mittal
MWCNTs/hectorite 3D hybrid filler was prepared from the 1:1 combination by weight of constituent MWCNTs (1D) and hectorite (2D) through simple dry grinding method. The resulting hybrid filler was subsequently utilized for the preparation of Ethylene-co-vinyl acetate (EVA)/MWCNTs/hectorite nanocomposites by solution intercalation method. Transmission electron microscopy and X-ray diffraction studies of the nanocomposites confirm homogeneous dispersion of the fillers in the polymer matrix. Mechanical, thermal and dielectric properties of neat EVA are significantly enhanced with increase in filler content...
June 1, 2018: Journal of Nanoscience and Nanotechnology
S Revathi, L John Kennedy, S K Khadheer Basha, R Padmanabhan
Nanostructured PbZr0.52Ti0.48O3 (PZT) powder was synthesized at 500 °C-800 °C using sol-gel route. X-ray diffraction and Rietveld analysis confirmed the formation of perovskite structure. The sample heat treated at 800 °C alone showed the formation of morphotropic phase boundary with coexistence of tetragonal and rhombohedral phase. The PZT powder and PVDF were used in 0-3 connectivity to form the PZT/PVDF composite film using solvent casting method. The composite films containing 10%, 50%, 70% and 80% volume fraction of PZT in PVDF were fabricated...
July 1, 2018: Journal of Nanoscience and Nanotechnology
E C Vermisoglou, T Giannakopoulou, N Todorova, T Vaimakis, N Boukos, D Petridis, C Trapalis
A facile and green method for trapping the hydrophobic reduced graphene oxide between the hydrophilic Kunipia F layers in order to attain stable aqueous dispersions of reduced graphene oxide is described. Initially stable aqueous dispersions of hydrophilic clay intercalated with hydrophilic graphene oxide sheets were formed providing well-organized heterostructures, as it was revealed by scanning electron microscopy images. These structures were preserved in the product obtained after hydrothermal treatment where the hydrophilic graphene oxide was converted to hydrophobic reduced graphene oxide...
July 1, 2018: Journal of Nanoscience and Nanotechnology
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