Electrophoretic deposition of nano-silica onto carbon fiber surfaces for an improved bond strength with cementitious matrices

2020 ◽  
Vol 114 ◽  
pp. 103777
Author(s):  
Huanyu Li ◽  
Marco Liebscher ◽  
Iurie Curosu ◽  
Soumyadip Choudhury ◽  
Simone Hempel ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Bond Strength ◽  
Electrophoretic Deposition ◽  
Nano Silica

scholarly journals Kemampuan Bacillus subtilis dan Lysinibacillus sp. dalam Silika Nano dan Serat Karbon untuk Menginduksi Ketahanan Bawang Merah terhadap Penyakit Bercak Ungu (Alternaria porri (Ell.) Cif)

Agrikultura ◽  
2019 ◽  
Vol 30 (1) ◽  
pp. 8
Author(s):  
Hersanti Hersanti ◽  
Sudarjat Sudarjat ◽  
Andina Damayanti
Keyword(s):  
Bacillus Subtilis ◽  
Carbon Fiber ◽  
Block Design ◽  
Antagonistic Bacteria ◽  
Nano Silica ◽  
Green House ◽  
Randomized Block Design ◽  
Plant Pest ◽  
Alternaria Porri ◽  
Induce Resistance

ABSTRACTThe ability of Bacillus subtilis and Lysinibacillus sp. singly or mixed, with carbon fiber and nano silica to induce resistance of shallot to purple blotchPurple blotch disease caused by Alternaria porri is one of the major disease on shallot. One of the methods that can be applied to control the disease is the use of antagonistic bacteria. Antagonistic bacteria can be used as a resistance inducer to suppress pathogen development. In this study, Bacillus subtilis and Lysinibacillus sp. were formulated in carbon fiber as a carrier and nano silica 3% as a complementary. This study was conducted to determine the ability of Bacillus subtilis and Lysinibacillus sp. singly or mixed, with carbon fiber and nano silica to induce resistance of shallot to purple blotch. The experiment was conducted at the Laboratory of Phytopathology, Departement of Plant Pest and Diseases and Ciparanje Green House, Faculty of Agriculture, Universitas Padjadjaran from December 2017 until July 2018. Suspension of Bacillus subtilis and Lysinibacillus sp. singly or mixed were formulated in carbon fiber 80 Mesh and 3% nano silica. The experiment used Randomized Block Design consisted of 8 treatments with 3 replications. Each replication consisted of 5 plants. The results showed that the mixture of Bacillus subtilis and Lysinibacillus sp. in 3% silica nano and carbon fiber was the ablest treatment to increase the resistance of shallot to purple blotch by 71,2%.Keywords: Antagonistic bacteria, BiocontrolABSTRAKPenyakit bercak ungu yang disebabkan oleh Alternaria porri merupakan salah satu penyakit utama pada bawang merah. Salah satu metode yang dapat digunakan untuk pengendalian yaitu menggunakan bakteri antagonis. Bakteri antagonis dapat digunakan sebagai penginduksi ketahanantanaman untuk menekan perkembangan penyakit. Pada penelitian ini, Bacillus subtilis dan Lysinibacillus sp. diformulasikan dalam serat karbon sebagai bahan pembawa dan silika nano 3% sebagai bahan pelengkap. Percobaan ini dilakukan untuk mengetahui kemampuan bakteri Bacillus subtilis dan Lysinibacillus sp. secara tunggal maupun campuran dalam serat karbon dan silika nano3% untuk menginduksi ketahanan bawang merah terhadap penyakit bercak ungu. Percobaan ini dilaksanakan di Laboratorium Fitopatologi, Departemen Hama dan Penyakit Tumbuhan dan Rumah Kaca, Ciparanje, Fakultas Pertanian, Universitas Padjadjaran mulai dari bulan Desember 2017 hingga Juli 2018. Suspensi Bacillus subtilis dan Lysinibacillus sp. secara tunggal maupun campuran diformulasikan pada serat karbon dan silika nano 3%. Percobaan menggunakan rancangan acak kelompok yang terdiri dari 8 perlakuan dengan 3 ulangan. Setiap ulangan terdiri dari 5 tanaman. Dari hasil percobaan diketahui bahwa campuran B. subtilis dan Lysinibacillus sp. dalam silika nano 3% serta serat karbon mampu meningkatkan ketahanan bawang merah terhadap penyakit bercak ungu dengan persentase hambatan sebesar 71,2%.Kata Kunci: Bakteri antagonis, Biokontrol

Electrophoretic deposition and thermal annealing of a graphene oxide thin film on carbon fiber surfaces

Carbon ◽  
2013 ◽  
Vol 52 ◽  
pp. 613-616 ◽  
Author(s):  
Sheng-Yun Huang ◽  
Gang-Ping Wu ◽  
Cheng-Meng Chen ◽  
Yu Yang ◽  
Shou-Chun Zhang ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Carbon Fiber ◽  
Thermal Annealing ◽  
Electrophoretic Deposition ◽  
Oxide Thin Film

Incremental Inspection for Microrobotic Quality Assurance

2013 ◽  
Author(s):  
David L. Christensen ◽  
Elliot W. Hawkes ◽  
Annjoe Wong-Foy ◽  
Ronald E. Pelrine ◽  
Mark R. Cutkosky
Keyword(s):  
Quality Assurance ◽  
Standard Deviation ◽  
Carbon Fiber ◽  
Bond Strength ◽  
Rapid Prototyping ◽  
Three Dimensional ◽  
Good Resolution ◽  
Measurement Standard ◽  
Directional Microphone ◽  
Inspection Techniques

This paper addresses inspection techniques that can be performed by microrobots used for fabricating three dimensional structures. In contrast to most commercial rapid prototyping processes, the parallelism afforded by microrobot teams allows incremental inspection of structures during assembly. In the present case, this approach is applied to parts fabricated from carbon fiber struts bonded with UV-cured epoxy. Preliminary tests involving thermal and vibrational inspection methods are described and compared with the results of FEA models of the joints. Vibrational inspection performed by microrobots and recorded using a directional microphone, characterizes bond joint natural frequency with good resolution (an average measurement standard deviation of 5Hz over a range of 650–1215 Hz). These effective stiffness measurements are correlated with ultimate bond strength as well. The measurements are sufficient to distinguish between joints that do or do not have desired amounts of adhesive.

Assessment of mechanical strength of nano silica concrete (NSC) subjected to elevated temperatures

2019 ◽  
Vol 10 (1) ◽  
pp. 90-109 ◽  
Author(s):  
Hala Mohamed Elkady ◽  
Ahmed M. Yasien ◽  
Mohamed S. Elfeky ◽  
Mohamed E. Serag
Keyword(s):  
Elevated Temperature ◽  
Bond Strength ◽  
Elevated Temperatures ◽  
Mechanical Performance ◽  
Mechanical Tests ◽  
Nano Silica ◽  
Content Type ◽  
Post Exposure ◽  
Concrete Mix ◽  
Bond Strengths

Purpose This paper aims to inspect the effect of indirect elevated temperature on the mechanical performance of nano silica concrete (NSC). The effect on both compressive and bond strengths is studied. Pre- and post-exposure to elevated temperature ranges of 200 to 600°C is examined. A range covered by three percentages of 1.5, 3 and 4.5 per cent nano silica (NS) in concrete mixes is tested. Design/methodology/approach Pre-exposure mechanical tests (normal conditions – room temperature), using 3 per cent NS in the concrete mix, led to the highest increase in both compressive and bond strengths (43 per cent and 38.5 per cent, respectively), compared to the control mix without NS (based on 28-day results). It is worth noticing that adding NS to the concrete mixes does not have a significant effect on improving early-age strength. Besides, permeability tests are performed on NSC with different NS ratios. NS improved the concrete permeability for all tested percentages of NS. The maximum reduction is accompanied by the maximum percentage used (4.5 per cent NS in the NSC mix), reducing permeability to half the value of the concrete mix without NS. As for post-exposure to elevated-temperature mechanical tests, NSC with 1.5 per cent NS exhibited the lowest loss in strength owing to indirect heat exposure of 600°C; the residual compressive and bond strengths are 73 per cent and 35 per cent, respectively. Findings The dispersion technique of NS has a key role in NSC-distinguished mechanical performance with NSC having lower NS percentages. NS significantly improved bond strength. NS has a remarkable effect on elevated temperature endurance. The bond strength of NSC exposed to elevated temperatures suffered faster deterioration than compressive strength of the exposed NSC. Research limitations/implications A special scale factor needs to be investigated for the NSC. Originality/value Although a lot of effort is placed in evaluating the benefits of using nano materials in structural concrete, this paper presents one of the first outcomes of the thermal effects on concrete mixes with NS as a partial cement replacement.

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