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IOP Conference Series: Materials Science and Engineering • Open Access • Volume , Issue • October • Article number • rd International Conference on Advanced Material for Better Future , ICAMBF • Surakarta, Central Java • October through October • Code

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Utilization of Yogyakarta natural zeolites to reduce NH and NO levels in shrimp pond water and its kinetic rate study 4 2

Anggoro D.D. ; Buchori L.; Sumantri I.; Ivan; Sejati D.A.B.; Oktavianty H.

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Department of Chemical Engineering, Diponegoro University, Semarang, 50275, Indonesia a

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Natural zeolite is an unique crystal that has a very small and uniform pore size when compared to other adsorbents, such as activated carbon and silica gel. This study aims to determine the potential of natural zeolite as an adsorbent, to absorb toxic gases in pond water, especially shrimp ponds and to study its kinetics rate of NH and NO adsorption. This study consisted of two stages: activated zeolite using NaOH, and tested the absorption power of NH and NO gases. Zeolite was activated using NaOH where 25 grams of zeolite were mixed with 0.5N NaOH and heated for 2 hours at 70°C, then stirred and dried in an oven at 110°C for 4 hours. Then zeolite was cooled in a desiccator. The results of NH and NO gas adsorption showed that natural zeolites can reduce NH and NO gas levels in shrimp pond water. The rate constant of pseudo-second-order, and the initial adsorption rate at any given time t, can be predicted from the equation which is full zeolite obtained the best perform of NH and NO adsorption. © Published under licence by IOP Publishing Ltd.

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Published under licence by IOP Publishing Ltd

International Conference on Advanced Materials for Better Future 2018 IOP Conf. Series: Materials Science and Engineering 578 (2019) 011001

IOP Publishing doi:10.1088/1757-899X/578/1/011001

1

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International Conference on Advanced Materials for Better Future 2018 IOP Conf. Series: Materials Science and Engineering 578 (2019) 011001

IOP Publishing doi:10.1088/1757-899X/578/1/011001

2

PREFACE

3

rd

International Conference on Advanced Material for Better Future 2018 (ICAMBF 2018)

The 3

rd

International Conference on Advanced Material for Better Future 2018 (ICAMBF 2018) was held on October 15-16, 2018 in Surakarta, Central Java, Indonesia. ICAMBF 2018 is an international scientific forum that was initiated to overcome material problems as well as factors affecting them that have emerged as the main issue and challenge attracting more attention from various scientists, government, and regulatory bodies worldwide. The ICAMBF 2018 was attended by leading scientists from countries near and abroad who work in the field of material.

This event based on theme Smart Materials for A Smart World that aims to provide a forum for scientists, researchers, and engineers within the nation and from around the world to present, discuss, share, and exchange their knowledge, experiences, and research finding on all aspects of material. Thus, this conference can give an excellent overview in all scope of fields including Functional Material, Material Chemistry and Physics, Advanced Nanomaterials, Polymer and Composites, Drug and Biomaterials Energy, Electrical, Optical and Magnetic Materials, Advanced Materials for Energy, Green Energy Materials, Batteries and Energy Storage Materials, Graphene and 2D Energy Materials, Separation Materials, Construction Materials, Metallurgy and Alloy Materials.

We are pleased to our outstanding invited speakers Prof. Ru-Jen Lin, Prof. Dr. Santiago Gómez-Ruiz, Prof. Dato’ Dr. Burhanuddin Yeop Majlis, Prof. Santiago Gomez, Prof. Ari Handono Ramelan, Assoc. Prof. Dr. Alfi Khatib and other participated speakers for sharing the best knowledge in Advanced Material.

We also thanks to all researchers and student who participate in conference by submitting their papers to convey the current science discussed at ICAMBF 2018, all of the organizing committee wish you get awesome conference experience, and reviewers for their valuable revision of these papers.

Prof. Ir. Ari Handono Ramelan, M.Sc (Hons), Ph.D

Chairman of ICAMBF 2018

Dean of Faculty Mathematics & Natural Sciences

(8)

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Published under licence by IOP Publishing Ltd

International Conference on Advanced Materials for Better Future 2018 IOP Conf. Series: Materials Science and Engineering 578 (2019) 011002

IOP Publishing doi:10.1088/1757-899X/578/1/011002

1

Chairman

Prof. Ir. Ari Handono Ramelan, M.Sc., (Hons), Ph.D.

Sebelas Maret University, Indonesia Co-Chairman Dr. Sayekti Wahyuningsih, MSi Sebelas Maret University, Indonesia Secretary Ahmad Marzuki, SSi, PhD Sebelas Maret University, Indonesia

Prof. Ir. Ari Handono Ramelan, M.Sc., (Hons), Ph.D.

Sebelas Maret University, Indonesia Ahmad Marzuki, SSi, PhD Sebelas Maret University, Indonesia Venty Suryanti. M.Phil. PhD Sebelas Maret University, Indonesia Dr. Sayekti Wahyuningsih, MSi Sebelas Maret University, Indonesia Dr.Desi Suci Handayani, M.Si. Sebelas Maret University, Indonesia Prof. Dr. Santiago Gómez-Ruiz

Rey Juan Carlos University, Móstoles (Madrid), Spain

Prof. Ko Tzu Hsiang Lung Hwa University, Taiwan Prof. Dato Dr. Burhanuddin Yeop

Majlis

Universiti Kebangsaan Malaysia (UKM), Malaysia

Prof Roger Narayan Joint Department of Biomedical Engineering, University of North

Carolina/North Carolina State University, USA

Dr. Agus Supriyanto, S.Si. M.Si Sebelas Maret University, Indonesia Dr. Eng. Risa Suryana, S.Si. M.Si. Sebelas Maret University, Indonesia Dr.rer.nat Witri Wahyu Lestari, M.Sc.

Sebelas Maret University, Indonesia Teguh Endah Saraswati, M.Sc, Ph.D Sebelas Maret University, Indonesia Dr. Tetri Widiyani, M.Si. Sebelas Maret University, Indonesia Dr. Artini Pangastuti, M.Si. Sebelas Maret University, Indonesia

CONFERENCE COMMITTEE/ORGANIZER

Scientific

Committee

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Preface

Papers

Materials Chemistry and Physics (MCP)

Volume 578 2019

Previous issue Next issue

International Conference on Advanced Materials for Better Future 2018 15–16 October 2018, Solo Paragon Hotel, Indonesia

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011001 OPEN ACCESS

PREFACE

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011002 OPEN ACCESS

Conference Committee/Organizer View article PDF Open abstract

011003 OPEN ACCESS

Peer review statement

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012001 OPEN ACCESS

Color Stability of Anthocyanins Copigmentation from Red Rice (Oryza sativa L.) Bran by Spectrophotometry UV-Vis E V Maylinda, A Rinadi, E A Putri, G Fadillah and S Wayuningsih

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012002 OPEN ACCESS

Synthesis and Characterization of Some Bromochalcones Derivatives V H E Susanti and W A E Setyowati

View article PDF Open abstract

012003 OPEN ACCESS

Facile Synthesis of Carboxylated Activated Carbon Using Green Approach for Water Treatment L Mahardiani, S Saputro, F Baskoro, N M Zinki and M Taufiq

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012004 OPEN ACCESS

Synthesis and characterization of hematite (α-Fe O ) from lathe waste using co-precipitation -calcination method L M Khoiroh, M N Al-Chabib and A Prasetyo

2 3

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012005 OPEN ACCESS

Synthesis and characterization of chitosan-pectin as adsorbent of dyes B Hastuti, S Hadi, S N Afifah and B Mulyani

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Synthesis of Sodalite from Indonesian Kaolin with Conventional and Alkali Fusion Method S N Khalifah, M Cahyawati, D K D Cahyani, A Arifah and A Prasetyo

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Synthesis and characterization complex Cobalt(II) with sulfadiazine M K Widowati, S B Rahardjo, S Hastuti and B F Ariyani

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Synthesis and Characterization Complex Nickel(II) with Diphenylamine Y A Rasyda, S B Rahardjo and F Nurdiyah

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Functional Materials (FM)

012009 OPEN ACCESS

Structure and Morphology of The (Ni, Co) Mo/Indonesian Natural Zeolite G M H A Ichsan, K D Nugrahaningtyas, D M Widjonarko and F Rahmawati

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012010 OPEN ACCESS

Surface modification of activated carbon using an atmospheric pressure dielectric barrier discharge (DBD) plasma jet R W Lubis, T E Saraswati, U H Setiawan and K Kusumandari

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012011 OPEN ACCESS

Synthesis of nanosize manganese oxides from its ore using solvothermal method

F D Y P Abi, R Kusumaningrum, W B Widayatno, A S Wismogroho, A Noviyanto, N T Rochman and M I Amal View article PDF

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012012 OPEN ACCESS

Local Wood's Bio-Oil Upgrading Using Non-sulfided (Co, Mo)/USY Catalyst K D Nugrahaningtyas and E Prasetyorini

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012013 OPEN ACCESS

Identification of chemical structure of anthocyanin and other active substances of red color melinjo peels by FTIR and LC-MC analysis E Tarmizi, A Z E Putri, M A Nusandari, Y A Husnil, R Saragih and L H Lalasari

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012014 OPEN ACCESS

The influence of scale-up treatment from red color melinjo peels mass on the produced anthocyanin characteristics E Tarmizi, A Z E Putri, M A Nusandari, Y A Husnil, R Saragih and L H Lalasari

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012015 OPEN ACCESS

Influence of Cd, Mn, and Co addition on the structural and optical properties of TiO crystal S Wahyuningsih, C Purnawan and D N Aisyah

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012016 OPEN ACCESS

Textile Wastewater Treatment by Using Plasma Corona Discharge in a Continuous Flow System M Amrial, K Kusumandari, T E Saraswati and Y H Suselo

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012017 OPEN ACCESS

Synthesis and characterization of vanadium doped Bi Ti O as photocatalyst material R Handayani, W N Safitri, N Aini, A Hardian and A Prasetyo

4 3 12

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012018 OPEN ACCESS

Synthesis Of Imprinted Ionic Material (SiO2(BGS/RHA)-TMPDT-Im-Au) For Adsorption Of Ion Au(III) S Hastuti, S Wahyuningsih, T Martini and I N Hayati

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012019 OPEN ACCESS

Patterned Porous Silicon Prepared by Reactive Ion Etching Technique R Suryana, N D Pratiwi, M Handayani, M Santika and O Nakatsuka

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012020 OPEN ACCESS

The effectiveness of the activated carbon from coconut shell and corn cob to adsorb Pb(II) ion and it's analysis using solid-phase spectrophotometry S Saputro, L Mahardiani, M Masykuri and A Z Jazuli

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012021 OPEN ACCESS

Properties of biosurfactant produced by Pseudomonas putida grown in Crude Palm Oil (CPO) V Suryanti, D S Handayani, A Masykur and Lindasari

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012022 OPEN ACCESS

Optimization of the use of fly ash and natural zeolite activated as composite for an adsorbent of lead heavy metal (Pb) Pranoto, T Martini, B M W Sunardi and E P Anandita

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Advanced Nanomaterials (ANM)

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012023 OPEN ACCESS

I-V characteristics on G4 DNA molecule: Electric field and current dependent hopping amplitude model E N Sinurat and E Yudiarsah

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012024 OPEN ACCESS

Influence of magnetic and electric field on I-V characteristic of the G4 DNA molecule L Apriyanti and E Yudiarsah

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012025 OPEN ACCESS

Modelling electric field influence on density of states (dos) and localization length of poly(da)-poly(dt) dna F Rahmani and E Yudiarsah

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012026 OPEN ACCESS

Utilization of Yogyakarta natural zeolites to reduce NH and NO levels in shrimp pond water and its kinetic rate study D D Anggoro, L Buchori, I Sumantri, Ivan, D A B Sejati and H Oktavianty

4 2

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012027 OPEN ACCESS

Dealumination of ZSM-5 as catalyst to convert glycerol to glycerol monostearate D D Anggoro, S B Sasongko, L Buchori, K C Sulistyani, A Oktavijaya and H Oktavianty

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012028 OPEN ACCESS

A microfluidic chip-based assay outperforms common methods for quantification of cell-free DNA and RNA T N Susilawati

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012029 OPEN ACCESS

Improving method of TiO -Fe O composite materials for self-cleaning glass preparation J P Ramadhani, S Wahyuningsih and A H Ramelan

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012030 OPEN ACCESS

Improving preparation method of TiO -NiO composite materials for self-cleaning glass I Farichah, S Wahyuningsih and A H Ramelan

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A control of TiO nanostructures by hydrothermal condition and their application: a short review R Hidayat, G Fadillah and S Wahyuningsih

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One Pot and Sonically Assisted Synthesis of Fe O and SiO @Fe O OA Saputra, WW Lestari and FR Wibowo

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The effect of holding time variation on the efficiency of DSSC TiO transparent with dye Ipomoea aquatica Forsk Khairuddin, C. Cari, A. Supriyanto and T. Y. Septiawan

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Size and aspect ratio dependency of sensitivity of ellipsoidal metal nanoparticle based liquid sensor M Muldarisnur, E Oktorina, N Fridayanti, E Zeni, E Elvaswer and S Syukri

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Bound state energies of a diatomic quantum dot molecule in a magnetic field M Ma'arif, A Suparmi and C Cari

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Solution of time independent cosmic string for harmonic oscillator plus poschl teller non-central potentials using supersymmetry quantum mechanics methods D Anggraini, A Suparmi and C Cari

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International Conference on Advanced Materials for Better Future 2018 IOP Conf. Series: Materials Science and Engineering 578 (2019) 012026

IOP Publishing doi:10.1088/1757-899X/578/1/012026

1

Utilization of Yogyakarta natural zeolites to reduce NH 4 and NO 2 levels in shrimp pond water and its kinetic rate study

D D Anggoro 1 , L Buchori 1 , I Sumantri 1 , Ivan 1 , D A B Sejati 1 , H Oktavianty 1

1

Department of Chemical Engineering, Diponegoro University, Semarang, 50275, Indonesia

E-mail: [email protected]

Abstract. Natural zeolite is an unique crystal that has a very small and uniform pore size when compared to other adsorbents, such as activated carbon and silica gel. This study aims to determine the potential of natural zeolite as an adsorbent, to absorb toxic gases in pond water, especially shrimp ponds and to study its kinetics rate of NH

4

and NO

2

adsorption. This study consisted of two stages: activated zeolite using NaOH, and tested the absorption power of NH

4

and NO

2

gases. Zeolite was activated using NaOH where 25 grams of zeolite were mixed with 0.5N NaOH and heated for 2 hours at 70

o

C, then stirred and dried in an oven at 110

o

C for 4 hours. Then zeolite was cooled in a desiccator. The results of NH

4

and NO

2

gas adsorption showed that natural zeolites can reduce NH

4

and NO

2

gas levels in shrimp pond water. The rate constant of pseudo-second-order, and the initial adsorption rate at any given time t, can be predicted from the equation which is full zeolite obtained the best perform of NH

4

and NO

2

adsorption.

1. Introduction

Development of cultivation systems from traditional to intensive with the majority shrimp ponds have potential towards increasing environmental pollution. Less optimal utilization of excessive feed will cause accumulation of organic matter. Decomposition of organic matter requires oxygen in the process, so that the availability of oxygen for the biota in it is reduced. If this happens continuously it will cause death for shrimp and other biota. Pollution materials that are difficult to decompose by microorganisms also cause hoarding and result in damage to the environment which will directly disrupt organisms that live in these environments. Organic pollution materials that function as fertilizers are actually detrimental due to algae blooms and aquatic plantscausing oxygen competition in the waters. The above factors are the cause of the decline in the body's resistance to the attack of the disease because of the poor quality of the environment, if this is left continuously then mass death will occur so that the population will decline [1].

Traditional methods for nitrogen removal from wastewater are denitrification, nitrification, chemical coagulation, adsorption, selective ion exchange, ammonia stripping, electrodialysis, filtration, reverse osmosis [2, 3, 4, 5]. Removal processes of dissolved nitrogen compounds, can vary.

For intensive RAS (Return Activated Sludge), the most common practice involves utilizing nitrifying

bacteria to convert ammonia-nitrogen to nitrate-nitrogen [6]. The rate limiting step of this process is

the oxidation of ammonia [7]. Incomplete nitrification occurs when a lack of NOB (Nitrite Oxidizing

Bacteria) productivity is present, leading to increased concentrations of nitrite. The adsorption process

(14)

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Published under licence by IOP Publishing Ltd

International Conference on Advanced Materials for Better Future 2018 IOP Conf. Series: Materials Science and Engineering 578 (2019) 012003

IOP Publishing doi:10.1088/1757-899X/578/1/012003

1

Facile Synthesis of Carboxylated Activated Carbon Using Green Approach for Water Treatment

L Mahardiani 1* , S Saputro 1 , F Baskoro 2,3 , N M Zinki 1 , and M Taufiq 1

1

Department of Chemistry Education, Faculty of Teacher Training and Education, Universitas Sebelas Maret, Jl. Ir. Sutami 36A, Kentingan, Surakarta, Indonesia

2

Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan (ROC)

3

Institute of Chemistry, Academia Sinica, Taipei 11529, Taiwan (ROC)

E-mail: [email protected]

Abstract. A chemical treatment by using oxidizing agents is the most common methodology to modify or create functional groups on activated carbon. The modified activated carbon obtained from chemical oxidation needs further treatment and produced waste, therefore a new approach is needed. A facile green approach is reported. In this approach the activated carbon was oxidized using air without additional chemical treatment to increase the content of acidic surface functional groups, especially carboxyl groups. The formation of carboxyl groups was confirmed by Temperature Programmed Decomposition, Boehm titration, and Infra-red spectroscopy results. The Boehm titration result showed higher contents of carboxyl groups by three-fold. The carboxylated activated carbon synthesized by green approach showed excellent performance for water treatment.

1. Introduction

Activated carbon (AC) is a common term used to describe carbon-based materials produced from various carbonaceous rich materials, such as wood, coal, lignite and coconut shell [1]. Activated Carbon is inexpensive and have been applied for many purposes, and as an adsorbent is one of it. It has been proven that AC is an excellent adsorbent for organic and inorganic pollutant removal for both in aqueous or gaseous environment [2,3]. However, it is believed that it is important to enhance the effectiveness of AC as adsorbent for specific usage. Therefore, the modification of surface of AC is necessary to develop affinity for certain contaminant [4]. One of the methods to modify is by chemical activation since it able to create acidic functional groups onto the surface of activated carbon [5, 6].

Regardless of the advantage of chemical activation, the waste that produced after its activation can not be avoided. Recently the synthesize and modification of materials is based on the green chemistry principles. Green chemistry offers an alternative to the traditional environment protection agenda, such as preventing waste production and minimizing the use of reagents and solvents [7].

Air oxidation is one alternative to alter the surface [6,8]. This method is facile since AC was

oxidized only by using the air to create the acidic functional groups such as carboxylic, phenolic, and

lactone [9]. In addition, there was no waste produced and use no reagents or solvents during the

oxidizing process. There are some experimental techniques that able to identify the formation of

functional groups crafted onto the surface of AC. Infra-red spectroscopic methods also applicable to

distinguished different functional groups based on the bands observed at different wavenumbers.

(15)

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Published under licence by IOP Publishing Ltd

International Conference on Advanced Materials for Better Future 2018 IOP Conf. Series: Materials Science and Engineering 578 (2019) 012019

IOP Publishing doi:10.1088/1757-899X/578/1/012019

1

Patterned Porous Silicon Prepared by Reactive Ion Etching Technique

R Suryana

1

, N D Pratiwi

1

, M Handayani

1

, M Santika

1

and O Nakatsuka

2

1

Department of Physics, Faculty of Mathematics and Sciences, Universitas Sebelas Maret, Jl. Ir. Sutami 36A Kentingan Surakarta 57126, INDONESIA

2

Department of Materials Physics, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, JAPAN

E-mail: [email protected]

Abstract. A previous study, porous silicon (PSi) have been fabricated by electrochemical anodization method. The PSi surfaces have an inhomogeneous pores size in the range of 95–

1450 nm. In this study, we have prepared patterned PSi using RIE technique in CF

4

gas which is activated by RF plasma. Before the RIE process, the surfaces Si was patterned using the photolithography method. Then, the Si surfaces were etched in various etching time to form patterned PSi. The patterned PSi samples were characterized by SEM, Dektak profilometer, and four-point probe equipment. We found the pore sizes and the pore depths for each the etching time were about 5.30 m and 12.6 nm; 5.19 m and 19.6 nm; 4.30 m and 23.8 nm;

3.40 m and 28.0 nm for 10 min, 20 min, 30 min, and 40 min, respectively. The pores depths increased with increasing the etching time. Meanwhile, the resistivity of patterned PSi increased with increasing the etching time i.e., 1.14×10

-4

.cm, 1.79×10

-4

.cm, 2.36×10

-4

.cm, and 2.60×10

-4

.cm for 10 min, 20 min, 30 min, and 40 min, respectively. This indicated that the pore could be considered as defects or dislocation inside material which resist electrons diffuse toward the electrode.

1. Introduction

Due to porous silicon (PSi) has good physical, chemical, and optical properties that can be applied in

electronic and optic devices, research on PSi from year to year is increasing [1-7]. The previous study,

we have fabricated PSi using the electrochemical anodization method on Si(100) surfaces [8]. The

pores have an inhomogeneous pores size in the range of 95 nm–1450 nm. In addition, there were two

groups of pores, i.e., the spherically shaped pores and the irregular shaped pores. The inhomogeneous

pores size and the irregular shaped pores can be difficult in the device applications because the PSi

fabrication is unreproducible. Therefore, in this research, the regular PSi fabrication has been

conducted by a combination of photolithography and reactive ion etching (RIE) techniques. These

techniques have good control of homogenous size and shape, porosity and depth pore of the Si

surfaces [9]. The patterned PSi samples were characterized by the scanning electron microscopy

(SEM) to observe the pore shapes and sizes, the Dektak profilometer to measure the diameter and the

depth of pores, and the four-point probe (4PP) equipment to calculate the resistivity of pores.

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Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

Published under licence by IOP Publishing Ltd

International Conference on Advanced Materials for Better Future 2018 IOP Conf. Series: Materials Science and Engineering 578 (2019) 012097

IOP Publishing doi:10.1088/1757-899X/578/1/012097

1

Comparative Study of three non-destructive techniques for metal loss inspection in pipe walls

J L Quiroga

1

, J E Quiroga

2

and P P Diaz

1

1

Facultad de Ingeniería Mecatrónica, Universidad Santo Tomás, Cra 27 Calle 9, Bucaramanga, Colombia

2

Escuela de Ingeniería Mecánica, Universidad Industrial de Santander, Cra 18 Calle 9, Bucaramanga, Colombia

Abstract. Identifying and describing metal loss defects in pipe walls is an indispensable task in transporting operations, this abnormal condition mainly appears as a result of corrosion and gouging. These metal losses can lead the pipeline to unsafe conditions originating leaks, rupture of the structure and associated hazards. In this work is presented a comparative study to assess the capabilities of detecting and describing the metal loss in a pipe wall based on three non- destructive techniques: Magnetic Flux Leakage, Eddy Current Testing, and Guided Waves.

These are compared by revising their physical principle and presenting a brief review of results obtained in metal loss inspection by considering some criteria as its sensitivity, depth of penetration, the range of inspection, and implementation easiness. Finally, the discussion is focused on of establishing which technique is most adequate for the inspection according to some characteristics of the metal loss defect.

1. Introduction

Magnetic Flux Leakage, Guided Waves, and Eddy Current testing are the most common on Non- destructive techniques used in the pipeline industry. These techniques have an advantage over others like liquid penetrant testing or X-ray as these allows automatic implementation and variations in designing for adapting to different conditions required.

A common characteristic of three techniques is that all of them can be generated by taking advantage of the properties of magnetic fields: One way of generating guided waves is by using magnetostriction principle, where the shape and size of ferromagnetic materials change during magnetization, eddy currents are produced due to the presence of a varying magnetic field in the test material and MFL take advantage of the leakage of the magnetic field around a metal loss defect.

This paper pretends to compare these three techniques in terms of detection and diagnosis capabilities and implementation in situ. The selected criteria to compare these techniques are based on determining high capabilities to detect and diagnose metal loss. The implementation easiness stands for the design and building of the transducer for the specific exploring condition excluding for the electronic components. The high sensitivity of the technique may produce false alarms and the relevant defects are not always the smaller ones. Therefore, a trade-off between high sensitivity and detection robustness must be considered.

2. Magnetic Flux Leakage

Magnetic Flux Leakage (MFL) is the most widely used method for inspecting cracks, corrosion and

other associated defects in pipelines. MFL setup is composed by a ferromagnetic core with an energized

coil or with strong permanent magnets like NdFeB to apply a magnetic field to the pipe wall close to

saturation. The discontinuities presence in the pipe wall yields magnetic field leakage around the defect

which is detected via an array of magnetic sensors. In this way, the screening is performed just in the

pipe wall covered by the magnetic sensors. This technique provides information for characterizing the

wall loss shape by estimating its width, length, and depth that are measured in the axial, circumferential

and radial direction of the pipe [1]. These dimensions are estimated by analysing the signatures of MFL

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