排序方式: 共有157条查询结果,搜索用时 15 毫秒
121.
Nasim Ganji Ali Allahverdi Fereshteh Naeimpoor Mostafa Mahinroosta 《Research on Chemical Intermediates》2016,42(6):5395-5412
In the present study, titanium dioxide (TiO2) nano-particles were synthesized by sol–gel technique and then used to provide nano-TiO2 loaded cement samples at 1, 5, and 10 wt% for investigation of Malachite green pigment decomposition and Escherichia coli inactivation under UV irradiation. Surveys conducted on the synthesized TiO2 nano-particles showed a 100 % anatase phase with a mean particle size of 66.5 nm, surface area of 64.352 m2 g?1, and a porosity volume of 0.1278 cm3 g?1. Cement samples containing this catalyst exhibited stronger photocatalytic properties as compared to the same amount of pure catalyst. Considering both photocatalytic performance and cost of catalyst, 5 wt% titanium dioxide was suggested to be added to cement. By addition of 1 wt% polycarboxylic copolymer as super-plasticizer to the cement paste, the photocatalytic sample activities were reinforced so that a similar performance could be obtained at 1 wt% catalyst as compared to 5 wt% catalyst without super-plasticizer. 相似文献
122.
Fereshteh Rashidi Johannes Leisen Seok‐Jhin Kim Ali A. Rownaghi Christopher W. Jones Sankar Nair 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(1):242-245
New membrane‐based molecular separation processes are an essential part of the strategy for sustainable chemical production. A large literature on “hybrid” or “mixed‐matrix” membranes exists, in which nanoparticles of a higher‐performance porous material are dispersed in a polymeric matrix to boost performance. We demonstrate that the hybrid membrane concept can be redefined to achieve much higher performance if the membrane matrix and the dispersed phase are both nanoporous crystalline materials, with no polymeric phase. As the first example of such a system, we find that surface‐treated nanoparticles of the zeolite MFI can be incorporated in situ during growth of a polycrystalline membrane of the MOF ZIF‐8. The resulting all‐nanoporous hybrid membrane shows propylene/propane separation characteristics that exceed known upper‐bound performance limits defined for polymers, nanoporous materials, and polymer‐based hybrid membranes. This serves as a starting point for a new generation of chemical separation membranes containing interconnected nanoporous crystalline phases. 相似文献
123.
Hamid Reza Bakhsheshi‐Rad Xiongbiao Chen Ahmad Fauzi Ismail Madzlan Aziz Elaheh Abdolahi Fereshteh Mahmoodiyan 《先进技术聚合物》2019,30(5):1333-1339
Bacteria‐caused infection remains an issue in the treatment of bone defects by means of Mg‐Zn‐Ca alloy implants. This study aimed to improve the antibacterial properties of an Mg‐Zn‐Ca alloy by coating with chitosan‐based nanofibers with incorporated silver sulfadiazine (AgSD) and multiwall carbon nanotubes (MWCNTs). AgSD and MWCNTs were prepared at a weight ratio of 1:1 and then added to chitosan at varying concentrations (ie, 0, 0.25, 0.5, and 1.5 wt.%) to form composites. The obtained composites were ejected in nanofiber form using an electrospinning technique and coated on the surface of an Mg‐Zn‐Ca alloy to improve its antibacterial properties. A microstructural examination by scanning electron microscopy (SEM) revealed the diameter of chitosan nanofiber ejected increased with the concentration of AgSD‐MWCNTs. The incorporation of AgSD‐MWCNTs into the chitosan nanofibers was confirmed by Fourier transform infrared spectroscopy (FTIR). Examination of the antibacterial activity shows that chitosan nanofibers with AgSD‐MWCNTs can significantly inhibit the growth and infiltration of Escherichia coli and Staphylococcus aureus. Biocompatibility assay and cell morphology observations demonstrate that AgSD‐MWCNTs incorporated into nanofibers are cytocompatible. Taken together, the results of this study demonstrate the potential application of electrospun chitosan with AgSD‐MWCNTs as an antibacterial coating on Mg‐Zn‐Ca alloy implants for bone treatment. 相似文献
124.
Mohammad Hakimi Fereshteh Sadeghi Nourollah Feizi Keyvan Moeini Monika Ku
erkov Michal Duek 《Acta Crystallographica. Section C, Structural Chemistry》2019,75(6):750-757
Two new N‐oxide compounds, namely glycinium 2‐carboxy‐1‐(λ1‐oxidaneyl)‐1λ4‐pyridine‐6‐carboxylate–glycine–water (1/1/1), C2H6NO2+·C7H4NO5?·C2H5NO2·H2O or [(2,6‐HpydcO)(HGLY)(GLY)(H2O)], 1 , and methyl 6‐carboxy‐1‐(λ1‐oxidaneyl)‐1λ4‐pyridine‐2‐carboxylate, C8H7NO5 or 2,6‐HMepydcO, 2 , were prepared and identified by elemental analysis, FT–IR, Raman spectroscopy and single‐crystal X‐ray diffraction. The X‐ray analysis of 1 revealed an ionic compound containing a 2,6‐HpydcO? anion, a glycinium cation, a neutral glycine molecule and a water molecule. Compound 2 is a neutral compound with two independent units in its crystal structure. In addition to the hydrogen bonds, the crystal network is stabilized by π–π stacking interactions of the types pyridine–carboxylate and carboxylate–carboxylate. The thermodynamic stability and charge‐distribution patterns for isolated molecules of 2,6‐H2pydcO and 2,6‐HMepydcO, and their two similar derivatives, pyridine‐2,6‐dicarboxylic acid (2,6‐H2pydc) and dimethyl 1‐(λ1‐oxidaneyl)‐1λ4‐pyridine‐2,6‐dicarboxylate (2,6‐Me2pydcO), were studied by density functional theory (DFT) and natural bond orbital (NBO) analysis, respectively. The ability of these compounds and their analogues to interact with nine selected biomacromolecules (BRAF kinase, CatB, DNA gyrase, HDAC7, rHA, RNR, TrxR, TS and Top II) was investigated using docking calculations. 相似文献
125.
Structural Chemistry - We applied density functional theory calculations to study reactions NH2 ?+ SinHn fullerenes (n?=?4, 6, 8, 10, 20, 24, 30, 36, and 50). The reactions... 相似文献
126.
Reyhane Rahimpour Sabeti Bahare Chekin Fereshteh 《Russian Journal of Electrochemistry》2021,57(6):654-662
Russian Journal of Electrochemistry - Fluoroquinolone ciprofloxacin (Cip) is an antibiotic used to treat some bacterial infections such as bone, joint, respiratory tract, skin, typhoid fever and... 相似文献
127.
Elham Vatandost Ghorbani-Hasan Saraei Azade Chekin Fereshteh Raeisi Shahram Naghizadeh Shahidi Seyed-Ahmad 《Russian Journal of Electrochemistry》2021,57(5):490-498
Russian Journal of Electrochemistry - Naphthol is an environmental pollutant with highly toxic and corrosive. Naphthol can be absorbed by the body easily through the skin, and can cause serious... 相似文献
128.
129.
Howeizi Jamaledin Taghvaei-Ganjali Saeed Malekzadeh Mercedeh Motiee Fereshteh Sahebdelfar Saeed 《Research on Chemical Intermediates》2019,45(5):3165-3181
Research on Chemical Intermediates - The complete saturation of commercial olefin-containing (3.3 mol%) C4 stream over Pd/γ-Al2O3 catalysts was studied. The catalysts were prepared by... 相似文献
130.
Russian Journal of Electrochemistry - At present, the graphene hybrid as electrode material demonstrates the efficient performance for oxygen evolution reaction (OER). OER influences some important... 相似文献