Wyniki wyszukiwania - BazTech

1

Wstępne badania nad oceną parametrów mechanicznych ochronnych materiałów tekstylnych powlekanych pastą poliuretanową z dodatkiem grafitu i nanorurek węglowych

Irzmańska Emilia, Boczkowska Anna, Żyłka Emilia, Jurczyk-Kowalska Magdalena, Strycharz Kamila, Szroeder Paweł

Przemysł Chemiczny

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2024

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T. 103, nr 1

117--123

PL

Omówiono wpływ grafitu oraz nanorurek węglowych dodanych do pasty powlekającej materiał tekstylny na podstawowe parametry mechaniczne. Przedstawiono wyniki badań odporności na przecięcie metodą TDM i coup test oraz odporności na ścieranie dla otrzymanych powlekanych materiałów tekstylnych.

EN

Meta-aramid fibers were coated with polyurethane paste mixed with graphite and C nanotubes in various configurations. Cutting and abrasion resistance as well as SEM anal. of composites were performed. The effect of the applied coating on the mech. parameters was examined.

2

Nowe nanomateriały do konstrukcji sprzętu sportowego

Jifang Yuan, Jianguo Chen, Yong Xu

Przemysł Chemiczny

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2023

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T. 102, nr 8

783--794

PL

Nowe nanomateriały dla sprzętu sportowego zostały przygotowane poprzez wzmocnienie żywicy epoksydowej (EP) włóknami węglowymi (CF) i/lub nanorurkami węglowymi (CNT) w celu poprawy jakości, twardości, plastyczności i odporności na starzenie materiałów kompozytowych. CNT zostały równomiernie rozmieszczone poprzez filtrację próżniową i fizyczne osadzanie na powierzchni włókien CF. Wytrzymałość na zginanie kompozytów CF/EP-CNT była o 28,08% większa niż niemodyfikowanego kompozytu CF/EP. Po starzeniu w temp. 120°C naprężenia w kompozycie zostały rozproszone ze względu na doskonałą dyspergowalność CNT, a tłumienie długich pęknięć spowodowało zmniejszenie obszaru uszkodzenia.

EN

New nanomaterials for sport equipment were prepd. by reinforcing an epoxy resin (EP) with C fibers (CF) and/or C nanotubes (CNT) to improve quality, hardness, plasticity and aging resistance of the composite materials. The CNT were uniformly dispersed by vacuum filtration and phys. deposition on CF fiber surface. The bending strength of CF/EP-CNT composites was by 28.08% higher than that of an unmodified CF/EP composite. After aging at 120°C, the stress in the composite was dispersed due to the excellent dispersibility of CNT, and the suppression of long cracks resulted in a redn. of damage area.

3

Nanorurki węglowe jako nowoczesny materiał do konstrukcji czujników

Lenik Joanna

Laboratorium - Przegląd Ogólnopolski

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2023

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nr 1

26--31

PL

Odkrycie nanorurek węglowych (CNT) w 1991 roku przez Sumio lijimę zapoczątkowało nową erę w materiałoznawstwie i nanotechnologii. Nanorurki węglowe to rodzaj alotropowej odmiany węgla, która budową przypomina walec. Twory te są niezwykle mocne i trudne do złamania, ale nadal lekkie. Ze względu na swoje fenomenalne właściwości elektryczne, termiczne, mechaniczne i chemiczne nanorurki węglowe są jednym z najlepiej przebadanych nanomateriałów. Wykorzystywane są w wielu dziedzinach, m.in. w medycynie, farmacji, nanoelektronice, nanokompozytach, w technologii elektronowej, przemyśle zbrojeniowym i wielu innych. Nanorurki węglowe są też często wykorzystywane w elektrochemii do konstrukcji czujników (tj. potencjometryczne), mających na celu poprawę ich odpowiedzi analitycznej. Nanomateriały te, ze względu na swoje unikatowe właściwości oraz ogromny obszar zastosowań, stanowią bardzo cenny materiał, który będzie zapewne głównym obiektem badań przyszłych technologii.

EN

The discovery of carbon nanotubes (CNTs) in 1991 by Sumio lijima gave rise to a new era in material science and nanotechnology. Carbon nanotubes are a kind of carbon allotrope that resembles a tube of carbon atoms. They are extremely strong and are difficult to break, but they are still light. Due to their phenomenal electrical, thermal, mechanical and chemical properties, carbon nanotubes are one of the most tested nanomaterials. They are used in many fields, including medicine, pharmacy, nanoelectronics, nanocomposites, electron technology, the defense industry and many others. Carbon nanotubes are also often used in electrochemistry for the construction of sensors (i.e. potentiometric ones), aiming to improve their analytical response. This nanomaterial, due to its unique properties and a vast area of application, is a very valuable material that will probably be the main object of research future technologies.

4

Comparative Investigation of Yield and Quality of Carbon Nanotubes by Catalytic Conversion of Recycled Polypropylene and Polyethylene Plastics over Fe-Co-Mo/CaCO3 Based on Chemical Vapour Deposition

Onu Matthew Adah, Ayeleru Olusola Olaitan, Oboirien Bilainu, Olubambi Peter Apata

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 5

174--186

EN

Polypropylene (PP) and polyethylene (PE) plastic waste is accumulating in the environment and the oceans at an alarming rate. The current management methods, mostly landfilling and incineration, are becoming unsustainable. In this study, thermal catalytic conversion of waste PP and PE polymers into carbon nanotubes (CNTs) using a trimetallic catalyst prepared from the nitrate salts of iron, cobalt, and molybdenum supported with calcium carbonate was reported. The yield and quality of multi-walled carbon nanotubes (MWCNTs) produced were investigated. The findings showed a high graphitic value for the CNTs obtained from PP and PE, as corroborated by the d-spacing of XRD. The ID/IG ratio of CNTS synthesized from PP and PE as carbon sources were 0.6724 and 0.9028, respectively, which showed that CNT produced from PP has more ordered graphite. The functional groups present in the produced CNTs were determined via FITR analysis. The BET and Langmuir surface areas were found to be (6.834 and 70.468 m2/g) and (6.733 and 70.347 m2/g) for CNTs obtained from PP and PE respectively. The d-spacing was computed as 0.3425 nm and 0.3442 nm for CNTs made from PP and PE. These fall within the graphite's d-spacing at 0.335 nm. The TGA showed high percentage purity of 94.71 and 94.40% for the products obtained from PP and PE, respectively. The findings showed that recycled PP and PE could be good alternative carbon sources for CNT production.

5

Druga rewolucja w konstrukcji lamp rentgenowskich

Jezierski Grzegorz

Postępy Techniki Jądrowej

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2022

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z. 4

23--30

PL

W artykule przedstawiono najnowsze osiągnięcia w konstrukcji lamp rentgenowskich, które można określić drugą rewolucją. Mianowicie podstawowy problem jaki stwarzają dotychczasowe rozwiązania wynikające ze stosowania termicznego źródła elektronów (m.in. problem chłodzenia, sterowania pracą lampy) został rozwiązany poprzez wykorzystanie nanotechnologii do konstrukcji innowacyjnych źródeł elektronów w oparciu o emisję polową (nanorurki węglowe czy mikro-ostrza).

EN

The article presents the latest achievements in the design of X-ray tubes, which can be described as the second revolution. Namely, the basic problem posed by the current solutions resulting from the use of a thermal electron source (including the problem of cooling, tubes control) has been solved by using nanotechnology to construct innovative electron sources based on field emission (carbon nanotubes or micro-tips).

6

Effect of reaction time on the structure and optical properties of P3HT/MWCNT-OH nanocomposites

Nurazzi, Norizan Mohd, Abdullah Norli, Ngah Demon Siti Zulaikha, Halim Norhana Abdul, Sa'aya Nurul Syahirah Nasuha, Mohamad Imran Syakir

Polimery

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2022

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Vol. 67, nr 5

205--211

EN

In the present study, regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT) coated hydroxylated multi-walled carbon nanotubes (MWCNT-OH) nanocomposites were prepared over different reaction times of non-covalent functionalization. The reaction time was set as 24, 48, 72, 96, and 120 hours. The structure and optical characteristics of nanocomposites were analyzed using Fourier-transform infrared (FTIR) and ultraviolet-visible (UV-Vis) spectroscopy, respectively. Reaction time affected prepared nanocomposites by decreasing the intensity of the P3HT/MWCNT-OH peaks gradually with increasing of the reaction time. Comparing with the pure P3HT and MWCNT-OH, the calculated energy band gap and the Urbach energy of the nanocomposites were reduced proportionally as the reaction time reached 120 hours and achieved 2.60 and 0.329 eV, respectively.

PL

Syntetyzowano hydroksylowane wielościenne nanorurki węglowe (MWCNT-OH) pokryte stereoregularnym poli(3-heksylotiofen-2,5-diylu) (P3HT) oraz zbadano wpływ czasu reakcji niekowalencyjnej funkcjonalizacji na strukturę i właściwości optyczne otrzymanego nanokompozytu. Czas reakcji wynosił 24, 48, 72, 96 i 120 godzin. W badaniach wykorzystano spektroskopię w podczerwieni z transformacją Fouriera (FTIR) oraz ultrafioletową UV-Vis. Wraz ze wzrostem czasu reakcji następowało stopniowe zmniejszenie intensywności pików P3HT/MWCNT-OH. W porównaniu z P3HT i MWCNT-OH obliczona przerwa energetyczna i energia Urbacha zmniejszały się wraz z wydłużeniem czasu reakcji i osiągnęły odpowiednio 2,60 i 0,329 eV przy czasie reakcji 120 godzin.

7

The microstructures of in-situ synthesized TiC by Ti-CNTs reaction in Cu melts

Xu Xuexia, Wang Yong, Wang Qing, Dong Guozhen, Li Wenbin, Li Guowei, Lv YaDong, Zhang Jin, Ding Haimin

Materials Science Poland

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2022

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Vol. 40, No. 1

145--158

EN

In order to study the influence of the carbon nanotubes (CNTs) as a source of carbon on the microstructure of in-situ synthesized TiC in Cu melts, CNTs and Ti powders were introduced into melted Cu to prepare TiC-reinforced Cu matrix composites. The influence of Ti/C ratio and Si on the microstructures and properties of the composites were also examined. It is found that CNTs can be effectively wetted through the Ti-C reaction and successfully introduced into Cu melt to synthesize TiC. In examining the changes in Ti/C ratio, it was found that an increase in the Ti content may result in the decrease of TiC agglomeration and improvement of TiC dispersion, while simultaneously causing an increase in the TiC particle size. Besides, while the addition of Si into Ti-CNTs mixture can also improve the distribution of TiC, the effect is weak compared with that of increasing the content of Ti. It was also found that the highest hardness (238.8 HV) is achieved by the Cu-Ti-C composite with the highest Ti/C ratio, while the electrical conductivities of all the prepared composites are relatively low, which should be due to the insufficient reaction between Ti and CNTs.

8

Study of Molecular Perovskite (H2dabco)[NH4(ClO4)3]/Carbon Nanotubes Energetic Composite

Hu Li-shuang, Liu Yang, He Dan, Yang Yajun, Gong Shida, Guang Chunyu, Deng Peng, Hu Shuangqi

Central European Journal of Energetic Materials

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2022

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Vol. 19, no. 1

91--105

EN

An ammonium perchlorate (AP, NH4(ClO4)3)-based molecular perovskite energetic material (H2dabco)[NH4(ClO4)3]/carbon nanotubes (DAP/CNTs) composite was prepared and characterized. Molecular perovskite DAP samples were synthesized by a facile one-pot reaction of triethylenediamine, perchloric acid (PCA, HClO4), and AP via a molecular assembly strategy. The results showed that the mechanical sensitivity (impact and friction sensitivities: >120 cm and 20%) and electrostatic spark sensitivity (8.90 J) of the DAP/CNTs energetic composite with 10 wt.% CNTs exhibited less sensitivity than that of DAP (impact, friction and electrostatic spark sensitivities: 112.3 cm, 45%, and 5.39 J, respectively), because of the mixing desensitization mechanism of CNTs. Compared with the pure DAP, the DAP/CNTs energetic composite has better performance with respect to thermal stability, exothermic capacity, and excellent continuous combustion properties. The DAP/CNTs energetic composite has potential application in a weapons system.

9

The Effect of Titanium Nitride Thickness as a Support Layer for Carbon Nanotubes Growth

Ramli Muhammad M., Osman Nurul H., Darminto D., Abdullah Mohd Mustafa Al Bakri

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 3

963--966

EN

The effect of titanium nitride (TiN) thickness as the support layer for carbon nanotubes (CNTs) growth was investigated by depositing three different thicknesses: 20 nm, 50 nm and 100 nm. This TiN support layer was deposited on SiO2 pads before depositing nickel (Ni) as the catalyst material. The Ni distribution on different TiN thicknesses was studied under hydrogen environment at 600°C. Then, the samples were further annealed at 600°C in acetylene and hydrogen environment for CNTs growth. The results show that, the optimum TiN thickness was obtained for 50 nm attributed by the lowest D to G ratio (0.8).

10

Mechanical and Dielectric Properties of Hybrid Carbon Nanotubes-Woven Glass Fibre Reinforced Epoxy Laminated Composites via the Electrospray Deposition Method

Zakaria Muhammad Razlan, Khairuddin Nur Aishahatul Syafiqa Mohammad, Omar Mohd Firdaus, Akil Hazizan Md, Othman Muhammad Bisyrul Hafi, Al Bakri Abdullah Mohd Mustafa, Abd Rahim Shayfull Zamree, Ting Sam Sung, Azmi Azida

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 2

669--675

EN

Herein, the effects of multi-walled carbon nanotubes (CNTs) on the mechanical and dielectric performance of hybrid carbon nanotube-woven glass fiber (GF) reinforced epoxy laminated composited are investigated. CNTs are deposited on woven GF surface using an electrospray deposition method which is rarely reported in the past. The woven GF deposited with CNT and without deposited with CNT are used to produce epoxy laminated composites using a vacuum assisted resin transfer moulding. The tensile, flexural, dielectric constant and dielectric loss properties of the epoxy laminated composites were then characterized. The results confirm that the mechanical and dielectric properties of the woven glass fiber reinforced epoxy laminated composited increases with the addition of CNTs. Field emission scanning electron microscope is used to examine the post damage analysis for all tested specimens. Based on this finding, it can be prominently identified some new and significant information of interest to researchers and industrialists working on GF based products.

11

Hierarchical Carbon Fiber-Carbon Nanotubes by Using Electrospray Deposition Method with Preserved Tensile Properties

Zakaria Muhammad Razlan, Akil Hazizan Md, Omar Mohd Firdaus, Al Bakri Abdullah Mohd Mustafa, Rahim Shayfull Zamree Abd, Nabiałek Marcin, Wysłocki Jerzy J.

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 4

1299--1304

EN

In this study, the electrospray deposition (ESD) method was used to deposit carbon nanotubes (CNT) onto the surfaces of carbon fibers (CF) in order to produce hybrid carbon fiber-carbon nanotubes (CF-CNT) which is rarely reported in the past. Extreme high-resolution field emission scanning electron microscopy (XHR-FESEM), high-resolution transmission electron microscopy (HRTEM) and x-ray photoelectron spectroscopy (XPS) were used to analyse the hybrid carbon fiber-carbon nanotube (CF-CNT). The results demonstrated that CNT was successfully and homogenously distributed on the CF surface. Hybrid CF-CNT was then prepared and compared with CF without CNT deposition in terms of their tensile properties. Statistically, the tensile strength and the tensile modulus of the hybrid CF-CNT were increased by up to 3% and 25%, respectively, as compared to the CF without CNT deposition. The results indicated that the ESD method did not cause any reduction of tensile properties of hybrid CF-CNT. Based on this finding, it can be prominently identified some new and significant information of interest to researchers and industrialists working on CF based products.

12

Enhancement of Tensile Properties of Glass Fibre Epoxy Laminated Composites Reinforced with Carbon Nanotubes interlayer using Electrospray Deposition

Zakaria Muhammad Razlan, Omar Mohd Firdaus, Akil Hazizan Md, Othman Muhammad Bisyrul Hafi, Al Bakri Abdullah Mohd Mustafa

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 2

685--690

EN

The introduction of carbon nanotubes (CNTs) onto glass fibre (GF) to create a hierarchical structure of epoxy laminated composites has attracted considerable interest due to their merits in improving performance and multifunctionality. Field emission scanning electron microscopy (FESEM) was used to analyze the woven hybrid GF-CNT. The results demonstrated that CNT was successfully deposited on the woven GF surface. Woven hybrid GF-CNT epoxy laminated composites were then prepared and compared with woven GF epoxy laminated composites in terms of their tensile properties. The results indicated that the tensile strength and tensile modulus of the woven hybrid GF-CNT epoxy laminated composites were improved by up to 9% and 8%, respectively compared to the woven hybrid GF epoxy laminated composites.

13

Dispersion mechanism-induced variations in microstructural and mechanical behavior of CNT-reinforced aluminum nanocomposites

Doğan Kemal, Özgün Muhammed Ihsan, Sübütay Halit, Salur Emin, Eker Yasin, Kuntoğlu Mustafa, Aslan Abdullah, Gupta Munish Kumar, Acarer Mustafa

Archives of Civil and Mechanical Engineering

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2022

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Vol. 22, no. 1

art. no. e55, 2022

EN

The combination of powder metallurgy and ball milling method has been widely regarded as the most beneficial route for producing multi-walled carbon nanotubes (MWCNTs)-reinforced aluminum matrix composites. In this study, the effects of different milling times (1, 2, 4, and 8 h) on the structural, morphological, and crystallographic properties of MWCNTs-reinforced Al7075 composite powders were characterized by particle size analyzer, Raman spectroscopy, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), and X-ray diffraction (XRD). After the morphological and structural characterization of the milled powders, the microstructural and mechanical properties of the hot-pressed composites were evaluated using an optical microscope, SEM, density, and Brinell hardness measurements. Considering milled powder characterization, the MWCNTs were gradually distributed and embedded within the matrix as the milling time increased. Milling for 8 h resulted in a minimum level of particle size (11 µm) with shortened and uniformly dispersed CNTs. Brinell hardness of the composite increased from 91 to 237 HB -a ⁓%160 after 8 h of milling. Such a remarkable increment in hardness could be attributed to several concurrent strengthening effects related to dispersion, solution, grain refinement, and Orowan looping mechanisms. However, relative density results revealed that the composite produced by 2 h milled powders exhibited the highest density (%99.96). The observed differences between hardness and density results were ascribed to powders’ deteriorated packing and sintering behavior due to an increment in the hardness of particles and variation in particle size range and morphology, which resulted from following different milling protocols.

14

Nanorurki węglowe - innowacyjny nanomateriał czy zagrożenie ekologiczne?

Godlewska Klaudia, Paszkiewicz Monika, Stepnowski Piotr

Analityka : nauka i praktyka

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2022

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nr 2

34--38

PL

Obecnie brakuje ustandaryzowanych protokołów oceny ekotoksyczności nanorurek węglowych w środowisku. Przygotowanie i szerokie wdrożenie takich znormalizowanych protokołów w środowisku naukowym i odpowiednich organach regulacyjnych jest niezbędnym krokiem w ocenie ryzyka ekologicznego.