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All Journal Physics Student Journal Natural B

Lailatin Nuriyah

Jurusan Fisika, Fakultas MIPA, Universitas Brawijaya, Malang

Author-ID : 335077

Environmental Science Physics

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Mechanical Properties Characterizations of Cassava Starch using Glycerol and Sorbitol Plasticizer Lailatin Nuriyah; Siti Jazimah Iswarin; Wiyono Wiyono
Natural B, Journal of Health and Environmental Sciences Vol 1, No 1 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

Bioplastic is a kind of plastic that biodegradable, and is made from renewable materials. This experiment has been intended to produce bioplastic from biopolymer such as: cassava flour, gelatin, jelly, with glycerol and sorbitol plasticizers. The basic materials (flour, gelatin, and jelly) compared to plasticizer is 3:2. The first sample is made with various amounts of gelatin and cassava flour, with a certain amount of plasticizer; the second sample is made with basic material are fixed, and plasticizer are varied. Syntheses were done by blending method at 90 °C. The mixing is done until the solution is homogeny, and then casting into the caster. The characterization mechanical test includes strain and stress with prior heating at 5°C, 25 °C and 45 °C. Strain test maximum is 2,456 N/mm2 for sample K3-L with prior heating at 45°C, and maximum stress of 115 % for sample K5-L at 25 °C. The Influence of variation of flour, gelatin, sorbitol and glycerol to tension is not predictable.

Tensile Strength and Elongation Characteristics of Bioplastics Made from Cilembu Sweet Potatoes Starch with Various Types of Plasticizers Lailatin Nuriyah; Gancang Saroja; Muhammad Ghufron; Arvi Razanata; Nova Fathur Rosid
Natural B, Journal of Health and Environmental Sciences Vol 4, No 4 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.591 KB)

Nowadays, many researchers are doing research in the field of degradable plastics with replacing synthetic polymers with natural synthetics for resulting the bioplastics. A natural raw that often used by the researcher is starch. For producing the bioplastic, the starch is mixed with plasticizers. The aims of this research are for observing the influences of the plasticizer to the tensile strength and elongation of bioplastic that made from the starch of Cilembu sweet potato. The plasticizers that used in this research are glycerol, sorbitol, and egg white. The bioplastics are produced in four stages, such as starch producing, heating and adding of the plasticizers, casting, and measuring the tensile strength and elongation. In the producing process of starch, firstly, the potato was destroyed, then it was blended with fresh water, after that it was settled down, followed by filtering and drying. The next stage was heating and adding of the plasticizers. The process of glycerol and sorbitol adding did at 45 oC while the heating process performed until gelatinization temperature was reached. However, while using egg white as a plasticizer, the process was started at 50 oC. After that, the casting stage was done, followed by the last stage, the testing of bioplastic samples. The results of the experiment show that the variation of the plasticizer affects the tensile strength and elongation of the bioplastic. The addition of plasticizer as many as 2,8% reduces the tensile strength of the bioplastic by 90% for glycerol and 75% for sorbitol. Whereas with the addition of the egg white, the tensile strength of the bioplastic is increased to 49%. For elongation property of the bioplastic, both glycerol and sorbitol as many as 2,8% will decrease the elongation value 32,8% and 16,1% respectively. However, the elongation values of the bioplastic fluctuated for the white egg plasticizer.

Biodegradable Plastics Functional Groups Methyl Acrylate and Pati Garut Relationship Against Mechanical Properties S J Iswarin; Lailatin Nuriyah; A I Sriwilujeng
Natural B, Journal of Health and Environmental Sciences Vol 2, No 2 (2013)
Publisher : Natural B, Journal of Health and Environmental Sciences

In order to addressing the problem of plastic waste accumulating, we made biodegradable plastic from starch with methyl acrylate as initiator. The biodegradable plastics are made by grafting method on a variety of arrowroot starch composition and methyl acrylate. Variations in the composition of arrowroot starch and methyl acrylate used was 30:70; 35:65; 40:60; 45:55; and 50:50.Results of the mechanical tests e.g. tensile strength and percent elongation on plastics, show that the best value is obtained on the composition of 30:70. It reaches of (14.8 ± 2.8) MPa in tensile strength, and (5.33 ± 0.08) % in elongation percent. This value is in accordance with the results of FTIR analysis. In here, the value of tensile strength is consistence with the value of absorbance of methyl acrylate, which indicates the concentration of functional groups C-C or the number of functional groups that formed. The greater of the concentration will be the greater of the tensile strength, while the percent elongation values are influenced by the number of functional groups C-O-C formed by arrow root starch.

Study of Adsorption and Desorption on Gold Metals by Biomass Saccharomyces cerevisiae. Thermodynamic Review Masruroh Masruroh; Lailatin Nuriyah; Siti Jazimah Iswarin; Eka Rahmawati
Natural B, Journal of Health and Environmental Sciences Vol 1, No 2 (2011)
Publisher : Natural B, Journal of Health and Environmental Sciences

A Study on biosorption of gold solution (Au) by Saccharomyces cerevisiae has been caried out. These studies included determination of optimum pH, optimum Au solution concentration, isotherm and biosorption capacity based on termodinamycs theory, and mechanims of interaction between Au ion and Saccharomyces cerevisiae biosorben. Mechanisms of interaction were known with Au ion on Saccharomyces cerevisiae biosorben using aquadest and 1 M HCl. The result showed that the optimum adsorption process of Au solution by Saccharomyces cerevisiae biosorben took place on pH 5, adsorbat concetration of 100 mg/L was 2.2321 mg/g of yeast. The adsorption isoterm followed the Langmuir adsorption with regresion value of 0.8550 (R2= 0.8550), that indicates that the chemisorption process occurred on the first monolayer on the adsorbent surface. From the thermodynamics theory gives Gibbs free energy of the process a value of ΔG = -0.09195 kJ/mol and showing spontaneous physisorption process. The number of Au ion desorption by using HCL was 73.98%, whereas by using aquades it was 35.42%. It indicated that the main interaction between Saccharomyces cerevisiae biosorben and Au ion was chemisorption.

Study of Effect of Concentration of MnCl2 Solution on Intensity of VCD chip Spectrometer Imagery Lailatin Nuriyah; S. J. Iswarin; Gancang Saroja
Natural B, Journal of Health and Environmental Sciences Vol 3, No 2 (2015)
Publisher : Natural B, Journal of Health and Environmental Sciences

Spectroscopy is study of interaction between radiation of wave and matter. In its application, spectroscopy has been used to observe and study the characteristics of a matter through its resulted spectrums. In this research, spectrometer was built with VCD chip and two kind of lamp sources, incandescent and fluorescent lamp. The MnCl2 solutions with concentration 0, 1, 2, and 3 M were used as sample. Image-J software was used to analysis the resulted spectrums. The results showed an interaction between rays and the solution with indication the image intensity decreased.

The Effect of Egg White Addition to Increase the Tensile Strength of Organic Planting Ribbons Lintang Ayu Rengganingrum; Johan Andoyo Effendi Noor; Lailatin Nuriyah
Natural B, Journal of Health and Environmental Sciences Vol 5, No 1 (2019)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar

Egg white contains high protein. Egg white acts as supporting matrix as well as adhesive and organic preservation. Organic planting ribbon based on mixture of water hyacinth with banana stalk is a supporting material for planting purpose, especially for rice planting system. This ribbon is in the form of a rice seed filled ribbon. The application of organic rolling tape in rolls and then lengthwise requires a high level of tensile strength so as not to tear easily. Variations of egg white composition are added to the organic planting tape to increase the value of its tensile strength. The tensile strength test was performed by Force Gauge physical properties i.e. shape, modulus, and density to determine density and strength of adding egg white as a matrix amplifier on the organic plant tape filler. Measurements were made by simulating the planting of rice planted with organic tuna with egg white and without egg whites which watered once every five days for sixty days. The results obtained are compared for analysis and drawn conclusions. The best data obtained for the addition of 250 grams of egg whites respectively for the value of tensile strength of 0.112 N / mm (before planting simulation) and 0.058 N / mm (after planting simulation) with the ability to survive around the age of 50 days.

The Estimate of Instantaneous Solar Radiation Intensity Using Energy Conversion Method Gancang Saroja; Lailatin Nuriyah; Chomsin S Widodo; M. F. Novanata
Natural B, Journal of Health and Environmental Sciences Vol 4, No 3 (2018)
Publisher : Natural B, Journal of Health and Environmental Sciences

The intensity of solar radiation provides information of amount energi that is transferred by the sun in a unit time. The information is used in many sectors for designing and assembling systems with solar energi sources. The measurement of the intensity of solar radiation directly requires a complex set of tools and procedures. This study aims to provide an estimate of instantaneous solar radiation by using energi conversion methods. The working principle of the method used is to capture the flux of solar radiation with a piece of black copper plates and then extract the energi into the water medium through direct contact of the water-copper plates. The increase of fluid temperatur is measured as a function of the time duration of radiation exposure. The radiation intensity value is obtained from derivation of the gradient value of the increasing temperatur. The results show that the energi conversion method gives the radiation intensity value matching the radiation intensity value based on the calculation of astronomical formulation. In the location of the experiment, at noon, the energi conversion method gives an instantaneous solar radiation intensity of 1149, 63 W/m2 with a difference of 0.59% with the calculation result of the astronomical formula.

Co-Authors A I Sriwilujeng aris kusnul widitama Arvi Razanata Chomsin S Widodo David Adi Sucipto Dian Anita Rohani, Dian Anita Djoko H Santjojo Eka Rahmawati Gancang Saroja Gancang Saroja Gancang Saroja Gancang Saroja Hanny Hafiar Hikmatud - Daroini, Hikmatud - Ilham Febriyantoro, Ilham Istiroyah Istiroyah Johan Andoyo Effendi Noor Lintang Ayu Rengganingrum M. F. Novanata Masruroh Masruroh Masruroh Masruroh Masruroh MASRUROH Muhammad Ghufron N. Ardian P Nidya Alverina Budi Ratna Sari, Nidya Alverina Nova Fathur Rosid S J Iswarin S. J. Iswarin Siti Jazimah Iswarin Siti Jazimah Iswarin Siti Jazimah Iswarin Unggul P Juswono Unggul Pundjung Juswono Wiyono Wiyono Yunita Dwi Hartatik Zain Asrori

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