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排序方式: 共有121条查询结果,搜索用时 15 毫秒
101.
Mahnaz GahremanDerakhshan Leila Nikzad Mohammad Farvizi Touradj Ebadzadeh 《International Journal of Applied Ceramic Technology》2021,18(1):32-39
Composite powders containing titanium diboride and boron carbide have been prepared by sol-gel method at 1450°C using titanium isopropoxide (titanium precursor), boric acid (Boron precursor), sucrose (carbon source), and acetic acid (AcOH) as a solvent. The effect of boron source (trimethyl borate and boric acid) and B2O3/TiO2, C/B2O3 mole ratios of starting materials on the final phases has been studied. The progress of reactions was determined using thermal analysis (TGA-DTA). The resultant powders were characterized by X-ray diffraction (XRD) analysis and field-emission scanning electron microscope (FESEM). XRD patterns confirmed the formation of TiB2, B4C, and TiC phases after heat treatment at 1450°C at mole ratio of B2O3/TiO2 = 4.5, C/B2O3 = 2.4. With increasing the content of boron oxide, the unwanted phases such as TiC and C were reduced. TiB2 and B4C composite powders (~5 µm diameter) containing residual carbon (<4 wt%) were synthesized using the mole ratio of B2O3/TiO2 = 10 and C/B2O3 = 1.9 at low temperature of 1450°C. 相似文献
102.
Mahnaz Farahani William E. Wallace Joseph M. Antonucci Charles M. Guttman 《应用聚合物科学杂志》2006,99(4):1842-1847
3‐Methacryloxypropyltrimethoxysilane (MPTMS) was converted to silsesquioxane oligomers by hydrolysis/condensation in three dental monomer solutions. The molecular mass distribution and molecular structures of these oligomers was studied by matrix‐assisted laser desorption/ionization time‐of‐flight mass spectrometry. Each dental monomer imparted distinct characteristics on the oligomeric silsesquioxane produced. Ethoxylated bisphenol A dimethacrylate (EBPADMA) produced low‐mass oligomer silsesquioxanes that showed complete hydrolysis and a very high degree of intramolecular condensation (i.e., there were no methoxy and few silanol groups remaining on the oligomers). 1,6‐Bis(methacryloxy‐2‐ethoxycarbonylamino) 2,4,4‐trimethylhexane also produced fully hydrolyzed oligomeric silsesquioxanes but with twice the average molecular mass as the EBPADMA. Finally, triethylene glycol dimethacrylate produced higher mass oligomeric silsesquioxanes than EBPADMA even though it showed incomplete hydrolysis. The degree of hydrolysis increased with increasing mass, as did the degree of intramolecular condensation. Oligomers with degrees of polymerization below 8 were poorly hydrolyzed and showed little if any intramolecular condensation. Those with degrees of polymerization of 9 or greater were almost completely hydrolyzed with a high level of intramolecular condensation. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1842–1847, 2006 相似文献
103.
Sepide Heydari Mohammad Ali Tavanaie Majid Montazer Mahnaz Mahmoudi-Rad 《应用聚合物科学杂志》2024,141(4):e54861
In this research the CuO nanoparticles were synthesized with four different methods then used to produce polyethylene terephthalate (PET) fibers with antibacterial, antifungal, and photocatalytic properties during the melt spinning process. Nanoparticles were synthesized in different ways using copper acetate salt (Cu(CH3COO)2) and sodium hydroxide (NaOH). The synthesis of copper oxide (CuO) nanoparticles was confirmed by field-emission scanning electron microscopy (FE-SEM images), EDX patterns, TGA, FTIR, X-ray diffraction pattern XRD, and UV-vis absorption spectrum. The results showed that synthesized nanoparticles exhibited strong antibacterial activity against gram-positive and gram-negative bacteria. Finally, after examining the fibers with different percentages of nanoparticles), fibers containing 1% of nanoparticles were produced using a 20% nanocopper oxide masterbatch as the optimal sample. The presence of nanoparticles in the fiber structure was confirmed by FE-SEM images, EDX, XRD, and FTIR analysis. Furthermore, the tensile properties, thermal behavior, and photocatalytic properties of the fibers were investigated. Evaluation of the antibacterial and antifungal activity of the produced fibers against gram-positive bacteria Staphylococcus aureus and Candida albicans fungus showed about 90% death of bacteria and fungi. 相似文献
104.
Erratum to: Vitamin D and Evening Primrose Oil Administration Improve Glycemia and Lipid Profiles in Women with Gestational Diabetes 下载免费PDF全文
105.
Behnaz Sadat Eftekhari Mahnaz Eskandari Paul A. Janmey Ali Samadikuchaksaraei Mazaher Gholipourmalekabadi 《Advanced functional materials》2020,30(25)
Incomplete regeneration and restoration of function in damaged nerves is a major clinical challenge. In this regard, stem cells hold much promise in nerve tissue engineering, with advantages such as prevention of scar‐tissue ingrowth and guidance of axonal regrowth. Engineering 3D and patterned microenvironments using biomaterials with chemical and mechanical characteristics close to those of normal nervous tissue has enabled new approaches for guided differentiation of various stem cells toward neural cells and possible treatment of neurodegenerative diseases such as Alzheimer's, Parkinson's, and Huntington's diseases. Differentiation of stem cells in a neurogenic lineage is largely affected by signals from the surrounding microenvironment (niche). The stem cell niche refers to a specific microenvironment around the stem cells, which provides specific biochemical (soluble factors) and biophysical signals (topography, electrical, and mechanical). This specified niche regulates the stem cells' behavior and fate. While the role of chemical cues in neural differentiation is well appreciated, recently, the cues presented by the physical microenvironment are increasingly documented to be important regulators of nerve cell differentiation. The single and synergistic effects of surface topography and electrical signals on neural differentiation of stem cells are reviewed. 相似文献
106.
Mahnaz Hashemi-Nasirabad Hamid Salehi-Mobarakeh Alireza Mahdavian 《Iranian Polymer Journal》2018,27(2):67-76
Modification of urea–formaldehyde (UF) resin binder for making fiberglass mats was aimed as a route to enhance its brittleness and improve its mechanical properties. The UF resin modifiers were chosen among pure acrylate emulsion polymers having different glass transition temperatures (T g). Blends of 10% w/w based on dry modifiers and UF resin were prepared. The most effective modifier was chosen and 4 wt% of nanoclay was added to the UF resin for improvement of its mechanical properties. Morphologies of the fractured surface of the UF-modified films were investigated by scanning electron microscopy (SEM). Coarser texture of the fractured surface was regarded as an increased toughness of the modified UF resin. Investigation of gel time at 100 °C on various modified urea–formaldehyde resins showed that the gel time of the modified UF resins generally decreases with adding polymeric emulsions. It is decreased further when less film forming latex (higher T g) is used in UF resin. Less film formation on the other hand, promotes easier water release during UF resin curing. Tensile and tear strength of the fiberglass mat composites have been increased up to 300 and 50%, respectively, while additional increase of 33% in tensile strength was obtained when nanoclay was incorporated into the composites. X-ray diffraction (XRD) analysis and Si-mapping through SEM were employed in order to show the dispersion and the distribution of nanoclay in the composites, respectively. The disappearance of the peak at 2θ = 7.22 confirmed the exfoliation of the employed nanoclay. 相似文献
107.
Abstract This study examined the efficiency of oxidized wood meal for removal of methylene blue (MB) as a typical basic dye from aqueous waste streams. The adsorption process was performed using sawdust treated with KMnO4, K2Cr2O7, and H2O2 oxidants. Among the tested chemical oxidants, KMnO4 was found to be more effective for modification of sawdust for dye uptake. Based on the breakthrough analysis, the highest column capacity of 227 mg g?1 was obtained for the KMnO4/SD. Sorption capacity of KMnO4 treated sawdust for dye uptake was about seven times that of untreated sawdust (SD). The nature and morphology of adsorbents were characterized by SEM, XRD, and FTIR analysis. The adsorption behavior of KMnO4/SD was found to be a strongly pH-dependent process and the maximum adsorption efficiency was obtained at pH 10. Dye-loaded KMnO4/SD sorbent can be regenerated using low-cost chemicals. 相似文献
108.
109.
Although quality is a critical success factor for all types of business, its salience is to be driven home in Pakistan's business environment in general and its export-oriented business segment in Pakistan in particular. As a first part of this effort, we chose to study quality management in Pakistan's knitwear industry, whose combined share with readymade garments in Pakistan's total exports rose to 16.7% by 1997/1998. We mailed a postal self-completion questionnaire to 59 members of the Pakistan Knitwear and Sweaters Exporters Association. The response rate was 29%. It was found that Pakistan's knitwear industry was in various stages of development in quality management, with greater concentration in the quality inspection mode. Although there are attempts to graduate to quality assurance and beyond, it was found that considerable distance has yet to be traversed before Pakistan's knitwear industry acquires a quality philosophy as a part of its overall business approach industrywide. As part of a statistical test, however, advanced quality management concepts were found applicable in Pakistan, although the application is currently limited. These concepts must gain in popularity. 相似文献
110.
Mahnaz Firouzi 《Chemical engineering science》2007,62(10):2777-2789
The results of extensive nonequilibrium molecular dynamics (MD) simulations of flow and transport of several binary mixtures of CO2 and an n-alkane chain, from CH4 to C4H10, through a model porous membrane composed of three pores in series with significantly different sizes and in the presence of an external pressure gradient, are reported. The technique that we use for the simulations is a combination of the configurational-bias Monte Carlo method (used for efficient generation of molecular models of n-alkane chains) and the dual control-volume grand-canonical MD method. The selectivity of the membrane changes qualitatively as the length of the alkane chain increases, resulting in high separation factors in favor of the alkanes. Moreover, we find that, under supercritical conditions, unusual phenomena occur that give rise to direction- and pressure-dependent permeabilities for the fluids. The results, which are also in agreement with a continuum formulation of the problem, indicate that the composite nature of the membrane gives rise to the direction-dependent permeabilities. Hence, modeling flow and transport of supercritical fluid mixtures in porous materials with the type of morphology considered in this paper (such as supported porous membranes) would require using effective permeabilities that depend on both the external pressure drop and the direction along which it is applied to the materials. 相似文献