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Fei Yu, Ming Li, Zhipeng Yuan, Feng Rao, Xingxing Fang, Baoguo Jiang, Yongqiang Wen, Peixun Zhang
Background: Articular cartilage defects are difficult to treat, but drug-loaded tissue engineering scaffolds provide a possible treatment option for these types of injuries. Purpose: In this study, we designed a bioactive resveratrol-PLA-gelatin porous nano-scaffold using electrospinning, freeze drying, and uniform dispersion techniques to repair articular cartilage defects, and then investigated the possible mechanism behind the successful repair. Methods: We established an articular cartilage defect rat model with a 2 mm diameter wound in the middle of the knee joint femoral condyle non-weight-bearing area, with a depth reaching the full thickness of the subchondral bone...
2018: International Journal of Nanomedicine
David J Lundy, Keng-Jung Lee, I-Chia Peng, Chia-Hsin Hsu, Jen-Hao Lin, Kun-Hung Chen, Yu-Wen Tien, Patrick C H Hsieh
The blood brain barrier (BBB) selectively controls the passage of endogenous and exogenous molecules between systemic circulation and the brain parenchyma. Nano-carrier based drugs such as liposomes and nanoparticles are an attractive prospect for cancer therapy since they can carry a drug payload and be modified to improve targeting and retention at the desired site. However, the BBB prevents most therapeutic drugs from entering the brain, including physically restricting the passage of liposomes and nanoparticles...
December 11, 2018: ACS Nano
Muhammad Saifullah, Shafket Rasool, SeJin Ahn, Kihwan Kim, Jun-Sik Cho, Jin-Su Yoo, Won Suk Shin, Jae Ho Yun, Joo Hyung Park
Thinning CIGSe absorber layer to less than 500 nm is desirable for reducing the cost per unit watt of PV-generated electricity and also the semitransparent solar cells based on such a thin absorber can be used in bifacial and superstrate configurations if the back electrode is transparent. In this study, a WOx layer is inserted between Cu(In,Ga)Se2 (CIGSe) absorber and tin-doped indium oxide (ITO) back-contact to enhance the hole collection at the back electrode. A WOx interlayer with a thickness of 6 nm is found to be optimum because it causes a ~38% relative increase in the fill factor (FF) of a ~450 nm thick CIGSe-based device compared to the reference device without a WOx interlayer...
December 11, 2018: ACS Applied Materials & Interfaces
Qing Zhu, Yuxia Jin, Wen Wang, Gang Sun, Dong Wang
Biomimetic actuators with rapid response speed, high sensitivity and selectivity to external stimulus have found potential applications in smart switches, artificial mussels and soft robots. The nano-scale structures of actuators enhance the exposed area to the stimulus, as well as enable the versatile controls of the actuation behaviors. The freestanding, flexible and porous water driven actuators with poly(vinyl alcohol-co-ethylene) (EVOH) nanofibers as substrate and super hydrophilic nano-scale cellulose materials (cellulose nanofibers, cellulose nanocrystals, bacterial cellulose) as active substance via uniform mixing or surface depositing were fabricated...
December 7, 2018: ACS Applied Materials & Interfaces
Mariam Ameen, Mohammad Tazli Azizan, Anita Ramli, Suzana Yusup, Mohamad Sahban Alnarabiji
Hydrodeoxygenation is one of the promising technologies for the transformation of triglycerides into long-chain hydrocarbon fuel commonly known as green diesel. The hydrodeoxygenation (HDO) of rubber seed oil into diesel range (C15 -C18 ) hydrocarbon over non-sulphided bimetallic (Ni-Mo/γ-Al2 O3 solid catalysts were studied. The catalysts were synthesized via wet impregnation method as well as sonochemical method. The synthesized catalysts were subjected to characterization methods including FESEM coupled with EDX, XRD, BET, TEM, XPS, NH3 -TPD, CO-chemisorption and H2 -TPR in order to investigate the effects of ultrasound irradiations on physicochemical properties of the catalyst...
March 2019: Ultrasonics Sonochemistry
Fei Han, Thirupathi Maloth, Gilles Lubineau, Recep Yaldiz, Amit Tevtia
Random networks of silver nano wires have been considered for use in transparent conductive films as an alternative to Indium Tin Oxide (ITO), which is unsuitable for flexible devices. However, the random distribution of nano wires makes such conductive films non-uniform. As electrical conductivity is achieved through a percolation process, understanding the scale-dependency of the macroscopic properties (like electrical conductivity) and the exact efficiency of the network (the proportion of nano wires that participate in electrical conduction) is essential for optimizing the design...
November 30, 2018: Scientific Reports
Parakandy Muzhikara Pratheeksha, Jayabalan Sri Rajeshwari, Paul Joseph Daniel, Tata Narasinga Rao, Srinivasan Anandan
In the present study, we have developed a simple and cost-effective approach for the synthesis of carbon coated LiFePO₄ wherein different carbon precursors were used to find out the suitable precursor for carbon coating. Initially, the appropriate amount of Li, Fe, and P precursors and carbon source (glucose/sucrose/fructose) were dissolved in ethanol solution followed by hydrothermal treatment at 180 °C to obtain carbon coated LiFePO₄. The structure and morphological analysis of In-Situ carbon coated LiFePO₄ revealed the formation of thin and homogeneous carbon layer on crystalline single-phase LiFePO₄ particles with fructose used as carbon precursor...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Brindha Appavu, Sivakumar Thiripuranthagan, Thamaraiselvi Kanagaraj, Sakthivel Kumaravel, Elangovan Erusappan
In this study, we report the synthesis of NiWO₄/nitrogen doped reduced graphene oxide nano composite by one-pot hydrothermal method. The NiWO₄ nano particles were dispersed uniformly on graphene sheets. The as prepared NiWO₄, NiWO₄/5% rGO and NiWO₄/N-5% rGO composites were analytically characterized by Powder X-ray diffraction (XRD), Raman spectroscopy, Diffuse reflectance spectroscopy (DRS-UV), Scanning electron microscopy (SEM) and N₂ adsorption-desorption isotherm. The photocatalytic performances of the synthesized composites were evaluated towards the photo degradation of congo red (CR) under visible light radiation...
May 1, 2019: Journal of Nanoscience and Nanotechnology
Gang Li, Shuhao Qin, Xiaonan Liu, Daohai Zhang, Min He
Biodegradable polymers, because their degradation products are small molecules that do not cause immune system rejection, have been increasingly used by researchers to explore the preparation of scaffold with excellent mechanical properties, biocompatibility and biodegradability. In this study, nano-hydroxyapatite and polybutylene succinate were mixed by solution-blending to prepare a porous scaffold that could be used in the biomedical industry. Based on the viewpoint of bionics, porous scaffold with well pore structure and uniform dispersion of nano-hydroxyapatite particles was prepared using ethanol as a porogen...
November 27, 2018: Journal of Biomaterials Applications
R Iqbal, B Majhy, Amy Q Shen, A K Sen
Understanding the formation of different morphological patterns depending on the particle size and surface wettability has great relevance in the separation, mixing and concentration of micro/nano particles and biological entities. We report the evaporation and morphological patterns of evaporating bi-dispersed colloidal droplets on hydrophilic and hydrophobic surfaces. To explain the underlying mechanisms of various particle distribution patterns, we propose a phenomenological model that accounts for the drag force, van der Waals and electrostatic interaction forces, and surface tension force acting on the particles...
November 26, 2018: Soft Matter
Bongseo Choi, Hansol Kim, Hyukjun Choi, Sebyung Kang
Protein cage nanoparticles are made of biomaterials, proteins, and have well-defined cage-like architectures designed and built by nature. They are composed of multiple copies of one or a small number of chemically identical subunits having a highly uniform nano-size and symmetric structure. Protein cage nanoparticles have genetic and chemical plasticity amenable to simultaneously introducing multiple cell-specific targeting ligands, diagnostic agents, and their corresponding therapeutic agents at desired sites depending on its purpose...
2018: Advances in Experimental Medicine and Biology
Sang Hee Park, Yeojin Kim, Soon Jin Kwon, Min Gyu Shin, Seung Eun Nam, Young Hoon Cho, You In Park, Jeong F Kim, Jung-Hyun Lee
Organic solvent nanofiltration (OSN) has made significant advances recently, and it is now possible to fabricate thin film composite (TFC) membranes with a selective layer thickness below 10 nm that gives ultrafast solvent permeance. However, such high permeance is inadvertently limited by the support membrane beneath the selective layer, and thus there is an urgent need to develop a suitable support to maximize TFC performance. In this work, we employed a commercially available polyethylene (PE) battery separator as a porous support to fabricate high performance TFC OSN membranes...
November 21, 2018: ACS Applied Materials & Interfaces
Palle R Murthy, Parasuraman Selvam
Ordered mesoporous carbon (OMC) supported gold nanoparticles of size 3-4 nm having uniform dispersion were synthesized by sol-immobilization method. OMCs such as CMK-3 and NCCR-56 with high surface area and uniform pore size were obtained, respectively, using ordered mesoporous silicas such as SBA-15 and IITM-56 as hard templates, respectively. The resulting OMC supported monodispersed nano-gold, i. e., Au/CMK-3 and Au/NCCR-56, exhibited excellent performance as mild-oxidizing catalysts for oxidation of glycerol with high hydrothermal stability...
November 21, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
M J Martínez-Pérez, J Pablo-Navarro, B Müller, R Kleiner, C Magén, D Koelle, J M de Teresa, J Sesé
Performing magnetization studies on individual nanoparticles is a highly demanding task, especially when measurements need to be carried out under large sweeping magnetic fields or variable temperature. Yet, characterization under varying ambient conditions is paramount in order to fully understand the magnetic behavior of these objects, e.g., the formation of nonuniform states or the mechanisms leading to magnetization reversal and thermal stability. This, in turn, is necessary for the integration of magnetic nanoparticles and nanowires into useful devices, e...
November 27, 2018: Nano Letters
Yao Zhao, Tiantang Fan, Jingdi Chen, Jiacan Su, Xin Zhi, Panpan Pan, Lin Zou, Qiqing Zhang
Magnetic-responsive materials are promising for applications in various biomedical fields. Especially, superparamagnetic nanoparticles are widely used in magnetic system for bone tissue engineering owing to superior biocompatibility and long term stability. Based on the idea of in situ bionics, we successfully incorporate the nano-hydroxyapatite (nHAP) and Fe3 O4 nanoparticles which were prepared by in situ crystallization and freeze-drying technique into the chitosan/collagen (CS/Col) organic matrix to achieve the uniform dispersion of inorganic substrate with nanometer-scale...
November 5, 2018: Colloids and Surfaces. B, Biointerfaces
Yu Xiang, Pengcheng Zhao, Zhaoqing Jin, Bo Chen, Hai Ming, Hao Zhang, Wenfeng Zhang, Gaoping Cao, Xiayu Zhu
Because of the disadvantages of commercial graphite anodes for high-power lithium-ion batteries, a kind of spinel nanolithium titanate (Li4 Ti5 O12 )/graphene microsphere composite [denoted as LTO/reduced graphene oxide (rGO)] is successfully synthesized. The as-prepared composite is made up of curled graphene sheets which are anchored with nano-Li4 Ti5 O12 particles. These nano-Li4 Ti5 O12 particles are uniformly decorated on the conductive graphene framework and their sizes range from just 15 to 20 nm. In the as-prepared composite, the curled graphene sheets form a unique mesopore-oriented structure which provides plenty of three-dimensional channels for ion transportation...
November 27, 2018: ACS Applied Materials & Interfaces
Hongwei Wu, Qiyan Feng, Hong Yang, Ping Lu, Bo Gao, Amir Alansari
The present work investigated the removal behavior of phenanthrene (PHE) by nano zero-valent iron immobilized on alkali modified biochar (nZVI/MB). Batch studies showed that nZVI/MB enhanced PHE removal by 4.9 times that of the nZVI and 1.2 times that of modified biochar (MB) alone, due to greater surface area and the inhibited aggregation of nZVI on the surface of MB. Transmission electron microscopy images revealed that the spherical nZVI particulates with average diameter of 32 nm uniformly dispersed on the surface of MB...
November 15, 2018: Environmental Technology
Jian Zhao, Shengming Wu, Jingwen Qin, Donglu Shi, Yilong Wang
A critical issue in nanomedicine is on the understanding of nano-bio interface behaviors, particularly when the nanoparticles are inevitably decorated by protein coronas in the physiological fluids. In this study, the effects of particle surface corona on cancer cell targeting were investigated in simulated physiological fluids. Cell targeting was achieved by two strategies: (1) using conventional EpCAM antibody-functionalized Fe3O4 nanoparticles, and (2) rendering the same but naked magnetic nanoparticles electrically-positively charged enabling them to electrostatically bind onto the negatively-charged cancer cells...
November 14, 2018: ACS Applied Materials & Interfaces
Neda Maftoonazad, Maryam Shahamirian, Dalia John, Hosahalli Ramaswamy
Electrospun film is developed from an electrically charged ultrafine jet of a polymer solution or melt as a matrix of thin/nano fibers struck on to a target surface. The objective of this work was to obtain homogeneous nanofibers from pea protein isolate (PPI) in polyvinyl alcohol (PVA) by hybrid electrospinning as well as incorporating cinnamaldehyde (CA) into the matrix to obtain an antibacterial mat. The effect of processing conditions, pH, polymer and CA concentrations on formulation properties and nanofiber morphology were investigated and the mats were visualized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR)...
January 1, 2019: Materials Science & Engineering. C, Materials for Biological Applications
Yongjie Zhang, Goro Miyamoto, Tadashi Furuhara
The composition of nano-sized alloy carbides formed by interphase precipitation in V-Nb and V-Ti multiple microalloyed low-carbon steels is analyzed by using three-dimensional atom probe. Carbide-forming alloying elements including V, Nb, and Ti, are simultaneously precipitated from the early stage of isothermal treatment, whose atoms are uniformly distributed in the carbide particles, even after prolonged holding. Cluster analysis by the maximum separation method, with parameters optimized using different methods, is carried out to extract alloy carbides from matrix...
November 12, 2018: Microscopy and Microanalysis
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