Juliana Anggono

• PhD
• Professor (Associate) at Petra Christian University

Wood plastic composite (WPC) is one example of a biocomposite that has been applied commercially as structural materials either in the building industry and in the automobile interior parts. In this work, WPC was developed based on polypropylene (PP) from used medical mask, polyethylene (PE) from plastic pocket reinforced with wood flour mixed with...

Biokomposit adalah material yang telah banyak dimanfaatkan oleh industri otomotif di negara maju terkait dengan peraturan ketat menyangkut isu penghematan energi dan lingkungan karena emisi gas buang serta material yang ramah lingkungan. Limbah alam lignoselulosa memiliki potensi menjadi bahan penguat untuk biokomposit. Telah banyak penelitian yang...

Photovoltaic (PV) modules are incorporated into buildings as constitutional elements in building integrated PVs (BIPVs). BIPVs are evident in daily life as various forms on the roofs or skins of buildings. However, their mediocre color (typically black), has led to poor public acceptance. The development of color BIPVs is required to bestow aesthet...

Polypropylene (PP) hybrid composites were prepared by the combination of natural reinforcements and poly(ethylene terephthalate) (PET) fibers. Wood, flax, and sugar palm fibers were used to increase stiffness and strength, while PET fibers served to improve impact resistance. Interfacial adhesion was increased by using a maleated PP (MAPP) coupling...

PP/sugarcane bagasse fiber composites were prepared by injection molding from two fractions of fibers with different particle characteristics. The mechanical properties of the composites were characterized by tensile and impact measurements, while local deformation processes by acoustic emission testing and microscopy. The determination of fiber di...

HIPS (High Impact Polystyrene) is one of the materials used in 3D printing. Research and application of the use of this material have not been done much, especially in the applications that require flexural strength. This study aims to find a combination of FDM (Fused Deposition Modelling) process parameter settings, that produce experiments with t...

Aluminium is widely used as a beverage can due to its excellence properties, i.e., good deformability; excellent corrosion resistance, high strength to weight ratio and non-toxic. The global consumption of canned drinks in 2017 was estimated at approximately 200 million pieces annually. These aluminium cans should then be recycled to minimize envir...

Strategies to improve quality of gravity die casting for Sn-Pb alloy are outlined here by modifying the mould’s gating system, i.e. mainly the down sprue and the sprue well. Analysis based on the experimental work of 27 casting products delivers a promising result for industrial application. Quantitative analysis of porosity defect in this work was...

PLA/sugarcane bagasse fiber composites were prepared by injection molding from two fractions of fibers with different fiber characteristics, which were determined before and after processing. Interfacial adhesion was modified by a maleated PLA coupling agent. The mechanical properties of the composites were characterized by tensile and impact testi...

Natural fibers used in the fabrication of biocomposite product can support the need of the industries for lightweight yet strong material. Sugarcane bagasse is one of the available natural fibers in Indonesia. There have been some research done on these bagasse fibers as reinforcement materials for plastics and their incorporation to the matrix has...

Polypropylene composites were prepared from neat and alkali-treated sugarcane bagasse fibers. The results showed that alkali treatment leads to an increase in composite stiffness and strength. A maximum is achieved in these properties at around 5 wt% NaOH content of the treating solution. The increase in properties was assigned to the improvement i...

There are more than 1000 species of cellulose plants available in fiber form. A number of them are by-products from the major food crops contain lignocellulosic sources and being investigated as composite reinforcement materials. Sugarcane bagasse and rice husk are potential reinforcement materials and they were used to reinforce polylactic acid (P...

Rapid prototyping is a group of techniques used to quickly scale physical parts or assemblies using three-dimensional computer-aided design (CAD) data. The process of 3D printing constructs three-dimensional objects from CAD models, usually by adding layers by a layer of material in a row. Therefore it is also called making addictive manufacturing....

A356.0 aluminum-silicon alloy is a base material for car rims application. Car rims are critical components for a vehicle as they carry the load of the passengers, goods, and the weight of the vehicle itself, therefore they should be sufficiently strong to withstand the vertical load, fatigue load, impact load, the side load and the braking force....

Lignocellulosic fibers extracted from sugarcane bagasse were treated with NaOH solutions of different concentration (0-40 wt%) to study the effect of alkali treatment on the composition, structure and properties of the fibers. Composition was determined by the van Soest method, structure was characterized by X-ray diffraction (XRD) and scanning ele...

Natural fibers have the ability to reinforce polymeric materials. In this work, sugar palm fibers were added as a reinforcement agent to a polypropylene (PP) matrix to form biocomposites. Flexural strength measurement in accordance with ASTM D790-17 was carried out on PP composites with the sugar palm fiber content changed from 0 to 30 wt.% in 5 wt...

Greater interest in recent years to the increase demand in using natural fiber reinforcement of polymers is to comply with the increasing stringent international protocols related to climate change and environmental awareness. Many studies have reported the development of renewable and biodegradable agricultural by-products as reinforcement fibers...

Remanufacturing is a process when used product or core is brought to ‘like-new’ condition, might be with an upgrade in performance. This process complies with technical specifications, including engineering, quality, and testing standards. It yields a fully warranted product. The purpose of this study was to conduct initial research on the feasibil...

Fine powder produced from coconut shells (CSP) has been found to be excellent functional filler in polypropylene, significantly increasing flexural and tensile moduli, slightly increasing tensile strength, and good retention of Izod impact strength at weight percentages less than 20 %. The research presented in this paper explores the temperature p...

Millions of canned drinks are consumed everyday globally and their wastes create an enviromental issue. Fortunately, the cans are made from aluminium (Al) so that it can be recycled. There are two main keypoints existing during the recycling process of Al cans, i.e. the aluminium loss or low Al-yield and low recycling yield. This work outlines the...

Polypropylene composites were prepared from sugarcane bagasse fibers by extrusion and injection molding. Wood flour was used as reference filler in the study. The fiber content of the composites changed between 0 and 30 wt% in 5 wt% steps. Maleated polypropylene was used as coupling agent to improve interfacial adhesion. Mechanical properties were...

Environmental awareness drives remanufacturing practices. Remanufacturing is reported to be more environmental friendly because it consumes less energy and less virgin materials. In addition, it provides customers more affordable products at the same quality. Previous studies identifies focus on purchase intention of long life-cycle remanufactured...

For buildings in tropical climates, the use of open windows for natural ventilation can not only provide low cost and low energy comfort but also provide thermal delight for occupants. However open windows let in environmental noise. The size and location of windows in walls are key but this study set out to determine whether there are any window f...

Many auto manufacturers such as Mercedes Benz, Toyota and DaimlerChrysler have already embraced natural fiber composites into both interior and exterior parts and are looking to expand the uses of this composites. They have to balance the changing public demands of greater comfort, better driving performances, and higher safety standards with the e...

Community Outreach Program is an established international service-learning program which has been around for 22 yr. The program offers an inter-discipline activity set in an international atmosphere to connect the academic theories with the actual social life and problems in the less developed rural community in East Java Province, Indonesia. Ther...

Every year during semester break in July to August, Petra Christian University holds an international service-learning which is popularly known as Community Outreach Program (COP). This program has been conducted for 20 yr since 1996 in which more than 15 university partners from 10 different countries have participated in COP. In this research the...

There are alot of materials available on market to make a 3D printing part, shuch as ABS, PLA, HIPS, PETG and others. On 3D printing product there are some responses that could be observeb. Some of responses are processing time, mechanical properties dimension accuracy and others. This research is conducted to compare the ABS and PLA efficiency on...

The effect of a frame around glass fixed windows on outdoor-indoor transmission class (OITC) was studied here. Three frame materials were selected, i.e., timber, Aluminum and unplasticized Poly Vinyl Chloride (uPVC). The use of real open window (to differentiate it from partially open double layered window) for natural ventilation was also studied....

There are several parameters that must be set before manufacturing a product using 3D printing. These parameters include the orientation deposition of that product, type of material, form fill, fill density, and other parameters. The finished product of 3D printing has some responses that can be observed, measured, and tested. Some of those respons...

Sugarcane fibers have been studied as reinforcement fibers to develop biocomposites of sugarcane fibers-polypropylene (PP). In this study, two different alkaline solutions were used to modify the sugarcane bagasse fibers, i.e. 10% v/v NaOH and 14% v/v Ca(OH)2 solution for 4 hours. Sugarcane fibers filled to polypropylene (PP) matrix was 3 cm, 5 cm...

Glass installed for building façade ideally possesses significant level of outdoor indoor transmission class (OITC) so it does not decrease OITC of conventional wall façade significantly. This study is about OITC of glass building in the temperature warmer than the one outlined by ASTM E-90, as it is commonly experienced in a tropical environment....

Milling sugarcanes to produce sugar generates by-product called bagasse. Due to the large availability and low cost, the potential of obtaining renewable and biodegradable fibers from bagasse had been explored. To produce fibers from these bagasse, the bagasse was treated in alkali solution using 14 % v/v calcium hydroxide, Ca (OH)2 at high tempera...

This work evaluated the improved performance of sugarcane bagasse fibers-polypropylene (PP) composites as a result of alkali treatment done on sugarcane bagasse as reinforcing fibers. An alkali solution of 10% NaOH with a temperature of 60-70°C was used to soak the bagasse for 2 to 6 hours. Hot pressed samples were prepared from a mixture of sugarc...

The abundant availability of LUSI (a short form of LUmpur SIdoarjo or Sidoarjo mud) mud of a mud volcano located in Sidoarjo, East Java, Indonesia, attracts interest of researchers to seek the possibility of utilizing it; among them is as construction material. This study focuses on the effect of calcinations temperatures of LUSI mud on the compres...

Addition of corn starch to the Al powders in a reaction bonding process has resulted in alumina porous ceramics. The corn starch added was meant to create porosities during heating therefore they act as channels for oxygen to access the inner part of the samples for oxidation. The number of corn starch added to the Al powder was varied from 10%, 20...

The addition of corn starch to the Al flakes powder to enhance its oxidation kinetics through pores formation to synthesize alumina (Al 2O3) via Reaction Bonding at 1400°C has shown a success. Heating temperature at 1000°C in air results in various size of pores left by the burn-out corn starch (corn starch decomposes at temperature 240-380°C). At...

Al-filler-loaded polymethylsiloxane (PMS) was pyrolysed in air atmosphere at temperatures 400–1700°C. The effect of the Al amount added to the PMS on phase development, densification behaviour and microstructure evolution was studied by simultaneous thermal analysis, X-ray diffraction, scanning electron microscopy and electron probe microanalysis....

As a Christian material scientist, I come to acknowledge that God, my Saviour, is the wonderful and perfect Creator of heaven and earth. As my knowledge of God and His creation grow, I find myself in awe of creative and detailed results of His hands in creating materials as resources of the earth provided for human usage. (Genesis 1:28) The term ma...

Silikon karbida (SiC) dapat dimanfaatkan untuk berbagai aplikasi yang membutuhkan ketahanan panas dan keausan yang tinggi, seperti perlengkapan dapur bertemperatur tinggi, elemen pemanas, piringan gerinda, dan bahan abrasif, varistor, serta light emitting diode (LED). SiC dapat dibuat dari bahan baku yang mengandung sumber silikon (Si) dan karbon...

Polymethylsiloxane (PMS) filled with a range of aluminium powders of different size and morphology have been used to produce precursor mixtures to form mullite bodies. The size and shape of the Al powder is shown to have a strong influence on the temperature and mechanism of mullite formation, on the final microstructure and phase composition of th...

Active filler pyrolysis of polymethylsiloxane/aluminum (PMS/Al) mixtures leads to the formation of mullite at 1400°C, and by 1700°C mullite is the only crystalline phase in an amorphous matrix. These mixtures show a complex series of oxidation and reduction reactions prior to the formation of mullite. Initial oxidation of PMS at low temperatures re...

Besides its importance for conventional ceramics, mullite has become a choice of material for advanced structural and functional ceramics due to its favourable properties. Some outstanding properties of mullite are low thermal expansion, low thermal conductivity, excellent creep resistance, high-temperature strength, and good chemical stability. Th...

Aluminium (Al) is an active metal which will oxidise readily through a rapid formation of a natural oxide film of alumina on the surface. This surface oxide film provides the corrosion resistance to the Al. A simultaneous thermal analysis consisting of thermogravimetry analysis/differential scanning calorimetry (TGA/DSC) on different morphology and...

Discontinuities and size of the weld deposit are affected by many factors. Magnetic arc blow is one of the factors that one may not be aware of. Magnetic arc blow was studied in this research with the ground position and welding current were varied. The discontinuities and size of the weld deposit were observed and measured by taking specimens of t...

Corrosion rate can be reduced by adding inhibitor and inhibition efficiency is a measure if its ability to suppress corrosion. The result of the immersion tests show that the inhibition efficiencies are different on each environment. Addition of 50 ppm of ascorbic acid results in the highest efficiency for NaC1 and CaCO3 environment while for Ca SO...

Planned Interval Test method conducted in several intervals of times (0-5) days, (0-10) days, (0-15)) days, and (10-15) days shows the changes of environment condition and metal corrosion. The changes in the corrosiveness media and the corrosion resistant of the material. The acidity of the media gets lower from 7.6 to 7.1 in the interval of (0-5)...

Angular distortion has an effect not only on the weld quality but also on the size and dimension accuracy. The amount of angular distortion is affected by the welding heat input and the flange thickness (h). This research was conducted to analyze the influence of welding heat input (welding current and speed were varied)on the angular distortion in...

There are two kinds of sacrificial anodes available to protect steel structure in the marine environment; they are zinc and aluminum alloy. This research studies their performance by conducting galvanic corrosion test in the substitute ocean water. The performance evaluated covers potential of protection, galvanic current, capacity and efficiency,...

Dalam penelitian ini, keramik alumina dibuat melalui dua proses, yaitu slip casting dan reaction bonding menggunakan bahan baku berbeda. Dalam proses slip casting digunakan serbuk alumina (α-Al2O3) berbentuk polygonal yang disiapkan dalam bentuk suspensi dalam media air yang dituang ke dalam cetakan berbahan gipsum. Sampel disiapkan dengan variasi...

Tujuan penelitian ini adalah berfokus pada mengembangkan keramik SiC yang dibuat dari campuran serbuk kayu meranti sebagai sumber C dan serbuk Si sebagai sumber Si pada temperatur <1500oC. Penelitian sebelumnya oleh Anggono, et al. (2007) telah berhasil didapatkan SiC terbuat dari campuran bahan yang sama pada temperatur 1575oC. Untuk mencapai temp...

Baja mangan austenitik adalah jenis baja yang memiliki ketahanan terhadap keausan dan beban mekanis sehingga aplikasinya banyak dimanfaatkan untuk peralatan-peralatan yang mengalami beban impak yang besar dan keausan tinggi, seperti stone crusher, hammer mill, dan rail crossing. Baja mangan yang diteliti dalam studi ini adalah tipe SCMnH 11 hasil s...

Community Outreach Program (COP) is an international service-learning program of Petra Christian University which has drawn many overseas students from the Netherlands, South Korea, Hong Kong, Japan, and Taiwan. COP provides students with a multicultural environment to learn and to serve as a team in a village where the cultural background is diffe...