Na-Alginate Utilization of Brown Algae (Sargassum sp.) as A Halal Edible Film Basic Materials

Edible films made of Na-alginate from brown algae have great potential to be developed as brown algae have a fairly high abundance in Indonesia but have not been widely used. Therefore, in this study conducted by making edible films made from Na-alginate modified by the addition of hydrocolloids carrageenan and glycerol plasticizier. The addition of carrageenan biopolymers is the property of the produced Edible film. The use of glycerol as a plasticizer aims to improve the properties of elasticity Edible films. This research method consists of two stages. First, the isolation and characterization of Na-alginate. Both the preparation and characterization of making edible films. Na-alginate characterization results in yield of 25.68%, 10.84% moisture content, ash content of 23.79%. The carrageenan on the formula Edible films affect the characterization of the resulting films. The value of water absorption from 333.13% to 335.45% and the elongation of 26.26% to 33.34%, and the declining value of tensile strength of 8.93 MPa to 4.17 MPa and young's modulus values of 0.34 MPa to 0.22 MPa with the addition of carrageenan on an Edible film formula

Constant speed motion analysis using a smartphone magnetometer

This study demonstrated that the constant average speed of a dynamic car could be measured and calculated using the smartphone magnetometer. The apparatus setup was built using a dynamic car, a linear track up to 1.50 m, a bunch of magnets, and a smartphone magnetometer application. The smartphone magnetometer application, ‘Physics Toolbox Suite’, was free for the experiment. The magnet and smartphone magnetometer were attached on a linear track and dynamic car, respectively. When the dynamic car are moving on the car track, the smartphone magnetometer will measure the magnetic feld value versus the time relation. The magnetic feld value will fluctuate, increasing when close to the magnet or decrease when the distance from the magnet increases. The magnetic feld properties (peaks time) versus the magnet distance position were analyzed using linear ftting, and we fnd the average speed of the dynamic car. We hope that this magnetometer experiment will be valuably used in general physics laboratories

Teknologi film tebal sebagai detektor formalin dan etanol

Indonesia merupakan negara dengan penduduk Muslim terbesar di dunia. Anjuran kepada umat Islam untuk mengkonsumsi makanan/minuman yang halal dan baik menjadi tantangan bagi para ilmuwan khususnya di bidang material untuk berinovasi dalam menciptakan sensor yang dapat mendeteksi kandungan gas dalam bahan konsumsi tersebut. Alkohol dan formalin merupakan dua sampel gas yang mungkin saja terkandung dalam bahan konsumsi masyarakat. Materi yang disajikan dalam buku ini meliputi berbagai metode sintesis nanomaterial sebagai material aktif pada sensor gas. Selanjutnya, dibahas pula beberapa teknik fabrikasi keramik sensor. Dalam buku ini dijabarkan secara rinci mengenai sintesis nanomaterial MnxZn1-xFe2O4 dengan menggunakan metode presipitasi. Lebih lanjut, fabrikasi nanokeramik MnxZn1-xFe2O4 menggunakan teknik screen printing diuraikan lebih khusus. Sifat-sifat fisis nanokeramik yang dihasilkan meliputi morfologi permukaan, ukuran butir, dan sifat listrik sensor diharapkan dapat menjadi landasan dalam tahapan aplikasi selanjutnya

Pengembangan Nanokeramik ZnxFe2-xO3:Mn berbahan lokal sebagai sensor alkohol bersensitivitas tinggi

Indonesia memiliki penduduk dengan mayoritas Muslim dan merupakan negara terbesar di dunia yang memiliki penduduk muslim. Syariat Islam mewajibkan kita untuk mengonsumsi makanan/minuman yang halal dan baik. Agar terjamin kebolehannya untuk dikonsumsi maka diperlukan suatu detektor. Hal ini menjadi tantangan bagi para peneliti khususnya di bidang material untuk berinovasi dalam menciptakan divais yang mampu mendeteksi kandungan gas yang terkandung dalam makanan/minuman tersebut. Sebagai contoh salah satu sampel gas yang sering terkandung dalam bahan konsumsi masyarakat adalah alkohol. Materi yang diuraikan di dalam buku ini mencakup berbagai macam metode sintesis material berukuran nano sebagai lapisan aktif yang sangat penting pada sensor gas. Teknik fabrikasi sensor yang fokus pada penggunanaan teknologi screen printing dan karakteristik sensor setelah penambahan dopan Mn dan chelating agent juga dibahas dalam buku ini. Dimana chelating agent digunakan sebagai media untuk mengikat ion-ion logam

A Facile Synthesis and Photoluminescence Properties of Boron Carbon Oxynitride (BCNO)Phosphor Materials for Security Ink Application

A facile synthesis of rare-earth free using boron carbon oxynitride (BCNO) phosphor material for security ink has been investigate. BCNO were synthesize by low temperature microwave heating methods, with H3BO3, citric acid and urea to be used as boron,carbon and nitrogen source,respectively. Then, the BCNO nanocrystals were disperse in water-polymer based solution until they became evenly spreading and turn into security ink without rare earth metals. The photoluminescence (PL) and UV-Visible spectroscopy were use to characterize the optical properties of BCNO and the security ink. The characterization results showed that BCNO and the security ink had similar PL properties (PL Peak and PL Peak Intensity). In addition, the UV-Vis spectra proved that the security ink had electronic properties such as being semiconductors based phosphor materials. The results indicate that BCNO phosphor material can be potentially be developed as rare-earth free security inks, and other applications such as optoelectronic, white LED, lighting, etc

Synthesis and Morphology Properties of Mn-doped Zinc Aluminate (ZnAl2-xO4: xMn4+, x=1%) Using Co-Precipitation Methods with Microwave Thermal Assisted

ZnAl2O4: Mn4+ particle were synthesize using co-precipitation using NaOH and PVA as precipitating agent and surfactants, followed by microwave-assisted thermal treatment. The morphology properties and absorption spectral of particles were investigate using SEM and UV-Vis spectrometer. The results showed that the ZnAl2O4 particles has a spinel structure with various particle size. Absorption spectral exhibits that particle has a potential photo catalytic properties at visible light spectra, especially for the pollutant degradation

Do it yourself: Optical spectrometer for physics undergraduate instruction in nanomaterial characterization

In this paper, we report on a homemade optical spectrometer using diffraction grating and image processing techniques. This device was designed to produce spectral images that could then be processed by measuring signal strength (pixel intensity) to obtain the light source, transmittance, and absorbance spectra of the liquid sample. The homemade optical spectrometer consisted of: (i) a white LED as a light source, (ii) a cuvette or sample holder, (iii) a slit, (iv) a diffraction grating, and (v) a CMOS camera (webcam). In this study, various concentrations of a carbon nanoparticle (CNP) colloid were used in the particle size sample test. Additionally, a commercial optical spectrometer and tunneling electron microscope (TEM) were used to characterize the optical properties and morphology of the CNPs, respectively. The data obtained using the homemade optical spectrometer, commercial optical spectrometer, and TEM showed similar results and trends. Lastly, the calculation and measurement of CNP size were performed using the effective mass approximation (EMA) and TEM. These data showed that the average nanoparticle sizes were approximately 2.4 nm and 2.5 ± 0.3 nm, respectively. This research provides new insights into the development of a portable, simple, and low-cost optical spectrometer that can be used in nanomaterial characterization for physics undergraduate instruction

Influence of sieve size on calorific value and proximate properties of bio-briquette composites

This work aimed to observe the influence of calorific value and proximate properties in the fabrication of rice husk (RS) and coffee shell (CH) briquettes composite. Rice and coffee husks contain cellulose, hemicellulose, and lignin. These contents are necessary for the adhesive to bind the briquette (amylose and amylopectin). The raw materials were carbonized at 400 oC for 60 minutes. Variations of sieving size (60, 80, and 100 mesh) and the composition ratio of raw material CH: RS were reviewed to study their effect. Tests of density, moisture content, volatile matter content, ash content, fixed carbon content, shatter index, combustion rate, and calorific value were carried out to determine the optimum composition. The results were obtained with the best quality at a particle size of 60 mesh with the highest calorific value of 17.422 MJ/Kg. It showed that the briquettes have good quality and are comparable with the standard briquette

Synthesis of activated carbon fiber from pyrolyzed cotton for adsorption of fume pollutants

In this study, we have synthesized and applied the activated carbon fibbers from pyrolyzed cotton to adsorp fume pollutants. The activated carbon fibbers from cotton were synthesized using an oven with simple heating method at low carbonization temperature. The cotton was successfully turned into carbon within four hours at carbonization temperature of 250oC. The reults showed that activation process using KOH and NaOH significantly affected the functional groups, morphology, diameter, and porosity of the activated carbon fibbers