ANALISIS STRUKTUR DAN POROSITAS KOMPOSIT Fe 3 O 4-KARBON AKTIF DARI LIMBAH KERTAS SEBAGAI ADSORBEN MAGNETIK. Komposit partikel magnet-karbon aktif dari limbah kertas telah berhasil dibuat. Karbon aktif dibuat dengan cara bahan kertas bekas dibakar dan selanjutnya direndam dalam asam kuat. Komposit Fe 3 O 4-karbon aktif dibuat dengan mencampurkan garam besi Fe 3+ /Fe 2+ (rasio mol 2 : 1) dengan suspensi karbon aktif dalam air. Larutan campuran garam besi-karbon aktif ditambahkan larutan NaOH tetes demi tetes pada kondisi suhu 70 o C. Analisis struktur, morfologi, ikatan kimia, sifat magnet dan porositas diselidiki dengan berbagai alat, berturut-turut menggunakan alat XRD, SEM, FTIR, VSM dan adsorpsi-desorpsi N 2 Quantasorb. Hasil karakterisasi menunjukkan bahwa nanopartikel Fe 3 O 4 telah berhasil tercangkok pada struktur karbon melalui interaksi gugus hidroksil. Bahan komposit mempunyai sifat magnetik berkelakuan superparamagnetik. Keberadaan nanopartikel Fe 3 O 4 pada struktur karbon membentuk sistem mesopori baru, dimana volume pori meningkat dari 0,07 cc/g menjadi 0,464 cc/g (meningkat 6 kali untuk karbon tanpa aktivasi dan meningkat dari 0,1053 cc/g menjadi 0,525 cc/g (meningkat 5 kali) untuk karbon aktivasi dengan sebaran ukuran pori rata-rata 17,5 nm. Hasil uji adsorpsi menunjukkan bahwa senyawa fenol dan metil jingga hanya mampu diserap 30% dalam larutan air, tetapi untuk senyawa metilen biru mampu diserap 96,3 % pada kondisi yang sama. Bahan komposit partikel magnet Fe 3 O 4 /karbon aktif limbah kertas dapat digunakan sebagai bahan alternatif menghilangkan zat warna metilena biru dalam limbah cair.
AbstrakSaat ini, perawatan metode kanguru mulai dianjurkan bagi bayi prematur karena kelahiran prematur dan bayi dengan berat badan lahir rendah merupakan salah satu penyebab kematian bayi terbesar. Tujuan penelitian ini adalah untuk mengetahui pengaruh perawatan metode kanguru terhadap respons fisiologis bayi prematur. Desain quasi experiment one group pre and post-test dilakukan di 2 rumah sakit di Jakarta. Sebanyak 16 bayi prematur yang memenuhi kriteria inklusi dipilih sebagai sampel. Hasil penelitian menunjukkan bahwa terdapat pengaruh yang bermakna dari perawatan metode kanguru terhadap respons fisiologis bayi prematur seperti peningkatan suhu tubuh ke arah suhu nornal (p value = 0,000), peningkatan frekuensi denyut jantung ke arah normal (p value = 0,003), dan peningkatan saturasi oksigen ke arah normal (p value = 0,023). Oleh karena itu, metode perawatan kanguru merupakan cara yang efektif, mudah, dan murah untuk merawat bayi prematur. Kata kunci: Bayi prematur, perawatan metode kanguru, fisiologis bayi AbstractAs premature birth and low birth weight are the main cause of neonatal mortality, kangaroo mother care is now suggested to care premature infants. The purpose of this study was to identify the effect of kangaroo mother care on physiological response of preterm infants. A quasi experiment design with one group pre and post test design was conducted in two hospitals in Jakarta. Sixteen preterm infants matching the inclusive criteria were selected as sample. The study found significant effect of kangaroo mother care intervention on physiological response of preterm infants, i.e. increasing body temperature to normal (p value = 0,000), increasing heart rate to normal (p value = 0,003), and increasing oxygen saturation (p value = 0,023). Therefore, the kangaroo mother care is therefore an effective, simple, and cheap method to care the preterm infants.
Stunting is a condition of failure to thrive in children under five due to malnutrition for a long time so that children are shorter than normal children their age. This condition is measured by a length or height that is less than minus two standard deviations of the median standard deviation of child growth from the WHO (Kemenkes RI, 2018). This study is an observational study with a descriptive approach to determine the characteristics of mothers that influence the incidence of stunting in toddlers aged 24-59 months in the working area of the Talang Banjar Health Center, Jambi City. The population in this study amounted to 713 and a sample of 256 mothers who had children aged 24-59 months by simple random sampling. The results show that the characteristics of mothers that affect the incidence of stunting in toddlers are mostly from mothers aged 26-35 years (55.4%), work mothers do not work / housewives (90.2%), high maternal education levels (60 ,9%), low socioeconomic (93.5%). It is hoped that nurses can provide health education to mothers with toddlers aged 24-59 months regarding stunting prevention in toddlers so that the prevalence of stunting can decrease.
In this research the polymer electrolyte materials based on poly caprolactone (PCL) has been synthesized and characterized. Polycaprolactone is a non-toxic and biodegradable polymer that is environmentally friendly. The preparation of the polymer electrolyte film is carried out by a casting method whereby the PCL polymer is dissolved in a tetrahydrofuran (THF) solvent. Lithium perchlorate salt (LiClO4) as a source of lithium ions then was added to solution with a composition (5-40)% by weight. The solution was evaporated slowly in vacuum oven until the film was formed. The ionic conductivity, crystal structure, morphology and thermal properties of the polymer electrolyte were characterized by impedance spectroscopy X-ray diffraction (XRD) and Infrared Spectrometer (FTIR, Scanning Electron Microscope (SEM). and Differential Scanning Calorimeter (DSC) respectively. The results of the conductivity measurements showed that the PCL conductivity increased from 3.45 x 10-11 Scm-1 to 5.52 x 10-6 Scm-1 with a 30% weight salt content of LiClO4. Observations with XRD show a more amorphous polymer with more salt addition and FTIR results show that there is interaction between active groups on polymers with salt. The thermal properties show that the melting points of polymer become lower with more salt addition.
The Aluminums (Al) substituted on M-type barium ferrite (BaFe12O19) is one of the magnetic materials, which can be applied to the microwave band working at high frequencies. The purpose of this paper is to investigate the effect of Al substitution for Fe3+ ions on the structure, magnetic and absorption behavior of M-type barium ferrite. The sample was prepared by mechano-synthesis using high-energy milling (HEM). In this research, Fe ion in BaFe12O19 was substituted by Al ion to form BaFe12-xAlxO19 for x = 0.0,BaFe10Al2O19 for x = 2.0 and BaFe8Al4O19 for x = 4.0 which is called as BAl-0, BAl-2 and BAl-4 sample, respectively. The stainless steel balls were used for the milling with a ball-to-powder sample ratio of 5. The mixing and milling for each the sample was conducted for 5 hours in ethanol medium and dried at 100oC in oven for 24 hours and then followed by heat treatment at 1100°C during 1h in the atmosphere media. The sample was characterized using X-rays diffractometer (XRD), Scanning Electron Microscope (SEM), Vibrating Sample Magnetometer (VSM) and Vector Network Analyzer (VNA). The result indicates that the addition of Al ion lead to the change cell parameters, volume, and the particles size. The magnetic behavior such as magnetic coercivity (Hc), magnetization saturation (Ms) and remanent (Mr) changed significantly with the substitution of Al ions. The optimum reflection loss (RL) is found to be –35dB at 14GHz for BaFe10Al2O19 (BAl-2) sample. It is shown that Al substitutions change the particle size, ferromagnetic resonant frequency, and structural and magnetic behavior of M-type barium ferrite.
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