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Article
Influence of Functionalization MWCNTs Using Acid Treatment on Gram Negative and Gram Positive Bacteria

Authors: Adawiya J. Haider --- Mohammed R. Mohammed --- Duha S. Ahmed
Journal: Iraqi Journal of Applied Physics المجلة العراقية للفيزياء التطبيقية ISSN: 18132065 23091673 Year: 2014 Volume: 10 Issue: 3 Pages: 29-33
Publisher: iraqi society for alternative and renewable energy sources and techniques الجمعية العراقية لمصادر وتقنيات الطاقة البديلة والمستجدة

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Abstract

In this work, the effect of chemical acids (like, mixture of H2SO4, HNO3 and H2O2) on the surface functionalization of multiwalled carbon nanotubes (F-MWCNTs) is illustrated. This effect leads to create functional groups like carboxyl (-COOH) and hydroxyl groups on the surface as well on the side walls of MWCNTs. The degree of covalent functionalization was examined by using Fourier transformed infrared spectroscopy (FTIR) which proved the formation of oxygen containing groups such as C=O and COOH. Transmission electron microscopy (TEM) used to characterize the morphological of surface modification on the MWCNTs structure due to oxidation by acid treatment during functionalization process. The antibacterial action of functionalized F-MWCNTs are tested for their efficiency in destroying the pathogenic bacteria, Gram negative (E. coli ) and Gram positive (S. aureus) bacteria, in addition to evaluate of bacterial adsorption on F-MWCNTs that are attributed to their fibrous shape with high aspect ratio. The results obtained indicate that modified F-MWCNTs were able to remove from 80-90% of E. coli at large exposure times while a higher removal of bacteria (up to 100%) of S. aureus was achieved when F-MWCNTs was used under the same conditions and improved antibacterial action of F-MWCNTs for the removal of Bacteria from water using modified F-MWCNTs.


Article
Study the Toxicity of Treated Multi Walled Carbon Anotubes (Mwcnts) on Escherichia Coli Bacteria and their Characterization
دراسة سمية الكاربون النانوي المتعدد الجدران المعامل على بكتريا Escherichia coli وخصائصه

Authors: Adawiya J. Haider --- Ali A. Tahaa --- Thorria R. Marzoog
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2014 Volume: 32 Issue: 2 Part (B) Scientific Pages: 370-378
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this study, we investigate the antimicrobial activity of treated Multi Walled Carbon Nanotubes (MWNTs) by oil toward gram negative bacteria Escherichia coli(E.coli) and treated MWNTs is performed according to a chemical procedure introducing -COOH groups on their surface . Structural and morphological characterizations of samples have been carried out using SEM and FT-IR spectroscopy. In addition, the SEM images prove the antimicrobial activities of treated MWNTs to bacterial cells by adhesion activity of E.coli on MWNTs surface. Since the functionalization of Multi Walled Carbon Nanotubes (MWCNT-COOH) can be used as effective antimicrobial materials and indicate that severe cell membrane damage by direct contact with MWNTs is the likely mechanism responsible for the toxicity to the model bacteria.

في هذه الدراسة يتم فحص الفعل المضاد للكاربون النانوي المتعدد المعامل بالزيت باتجاه بكتريا ذات شحنة سالبة Escherichia coli وان الكاربون النانوي المتعدد يكون مفضل لاحتواءه على جذور فعالة –COOH)) على سطحه.ان تركيب و طبوغرافية العينات يتم دراستها باستخدام كل من المجهر الماسح الالكتروني (SEM) و مطياف الاشعة تحت الحمراء (FTIR). بالاضافة الى ان صور المجهر الماسح الالكتروني يثبت فعالية الكاربون النانوي المتعدد المعامل للخلايا البكتيرية من خلال فعالية الالتصاق لبكتريا Escherichia coli على سطح MWNTs. اذا فان الكاربون النانوي المتعدد الموظف MWCNT-COOH يمكن استخدامه كمادة فعالة يمكن ان تدمر جدار الخلية بشكل حاد من خلال الاتصال المباشر مع MWNTs ويمكن اعتبارها الميكانيكية المسؤولة عن سمية موديل البكتريا.


Article
Functionalization of single and multi-walled carbon nanotubes by chemical treatment
تحسين خواص الانابيب الكاربونية النانوية المفردة والمتعددة الجدران بطريقة المعالجة الكيميائية

Authors: Akram Sh. Ahmed اكرم شاكر احمد --- Fadhil A. Umran فاضل عباس عمران --- Duha S. Ahmed ضحى سعد احمد
Journal: Iraqi Journal of Physics المجلة العراقية للفيزياء ISSN: 20704003 Year: 2018 Volume: 16 Issue: 39 Pages: 55-63
Publisher: Baghdad University جامعة بغداد

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Abstract

In this work we experimentally investigated SWCNTs and MWCNTs to increase their thermal conductivity and electrically functionalization process using different reagents ((nitric acid, HNO3 followed by acid treatment with H2SO4), then washed with deionized water (DW) and then treated with H2O2 via ultrasonic technique. Then repeated the steps with MWCNTs and compare their results in an effort to improve experimental conditions that efficiently differentiate the surface of the single walled carbon nanotubes (SWCNTs) and multi walled carbon nanotubesi(MWCNTs) that less nanotubes destroy and to enhance the properties of them and also to reduce aggregation in liquid. the results were prove by XRD, and infrared spectroscopy (FTIR). The FTIR spectrum shows the presence of carboxylic group after treatment with (acid oxidation and H2O2) and refers to Functionalization (SWCNTs) and (MWCNTs) on the surface wall microscopic images show surface adjustment on SWCNTs and ((MWCNTs)) structure after any treatment. AT last,a fully of SWCNTs and MWCNTSIwere obtained successfully accomplished with the reduction of the collapsed structure.

في هذا العمل قمنا بالتحري عن عملية تحسين وظائف SWCNTS، والتي يتم معالجتها بمواد تفاعلية مختلفة (حمض النيتريك، HNO3 وتليها المعالجة الحمضية باستخدام H2SO4)، ثم تغسل بالماء المقطر (DW) ثم تعامل مع H2O2 عبر تقنية الموجات فوق الصوتية. ثم كرر الخطوات مع MWCNTs وقارن نتائجها في محاولة لتحسين الظروف التجريبية التي تفرق بكفاءة سطح الأنابيب النانوية الكربونية أحادية الجدار (SWCNTs) والأنابيب النانوية الكربونية متعددة الجدران (MWCNTs) التي تقل فيها الأنابيب النانوية ولتعزيز خصائصها وأيضا للحد من التجميع في السائل. وقد تم تأكيد النتائج من قبل XRD، والتحليل الطيفي بالأشعة تحت الحمراء (FTIR)، المجهر الإلكتروني الماسح (SEM). ويبين الطيف FTIR وجود مجموعة الكربوكسيل بعد العلاج مع (أكسدة حامض و H2O2) ويشير إلى functionalization (SWCNTs) و (MWCNTs) على الجدار الخارجي السطح. تظهر الصور المجهرية تعديل السطح على SWCNTs وبنية (MWCNTs) بعد كل معاملة. وأخيرا، تم الحصول على بئر من SWCNTs و (MWCNTs) بنجاح مع الحد من الهيكل المنهار.


Article
Physical and Electrical Study of Different Carbone Nanomaterials as Modifying Material for SPCE

Author: Issam A. Latif
Journal: Iraqi National Journal Of Chemistry المجلة العراقية الوطنية لعلوم الكيمياء ISSN: 22236686 Year: 2016 Volume: 16 Issue: 4 Pages: 186-203
Publisher: Babylon University جامعة بابل

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Abstract

In this work was prepared three different types of modified screen printed carbon electrode (SPCEs) with drops casted method, the used carbone nanomaterials were the MWCNT, functionalized –MWCNT (f-MWCNT) and After several experiments were made to find an appropriate ratio to make good GOT/f-MWCNT nanocomposite, and found the suspension mixture (1:1) from GOT/f-MWCNT (f-MWCNT-GOT). The electrical and physical properties were performed with cyclic voltammeter technique, and studied the maximum current response, the effective surface area, effect of the pH value and the determination of active surface area for MWCNT-SPCE , f-MWCNT-SPCE and f-MWCNT-GOT/SPCE as (0.04 cm2), (0.119 cm2) and (0.115 cm2) respectively, the surface coverage concentration ( Γ) of the material on each area was calculated and was 9.447×10-10, 9.449×10-10 and 9.3×10-10 mol cm–2 ,for MWCNT ,f-MWCNT and f-MWCNT-GOT respectively, The values of Γ for all three types of electrodes were almost the same and no noticeable difference. These electrodes were used to study the electrochemical behavior of organic compound which consisting an amide functional group, these group founded in huge spectrum of pesticide and medicine compounds etc. the penicillin antibiotic drug family has a β-lactam group (Azetidine-2-one) group. Therefore it was expected to show hydrolysis with opening of the four membered ring azetidine-2-one, in a H+/1ē process. In this work used ampicillin antibiotic AMP. The cyclic voltammetry investigation was shown the signals of anodic peak current were higher than the cathodic current signals Ipa/Ipc≠ 1, which indicated an irreversible electrode reaction, with differential pulse voltammetry was studded the limit of detection (LOD), the modification of SPCE with the f-MWCNT-GOT show the best result than the other two carbone nanomaterial MWCNT and f-MWCNT.

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