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Abstrak :
"ABSTRACT
" Yttrium metal organic framework Y-MOF berhasil disintesis dengan metode solvotermal. Pada penelitian ini digunakan variasi suhu sintesis Y-MOF yaitu 100, 120, 140 oC. Hasil karakterisasi Raman dan XRD, menunjukkan bahwa sifat kristalin terbaik dari material Y-MOF terbentuk optimal pada suhu 120oC. Melalui hasil karakterisasi FTIR, 1H-NMR dan Raman dapat dikonfirmasi bahwa dalam material Y-MOF terdapat ligan DMF dan linker BDC yang terkoordinasi pada logam Yttrium trivalen dan dari hasil karakterisasi empat instrumen tersebut Y-MOF memiliki kemiripan karakter dengan Yb-MOF MB2 . Adanya kemiripan karakter antara Y-MOF dengan Yb-MOF, diharapkan struktur Y-MOF menyerupai Yb-MOF. Y-MOF yang telah disintesis berkesempatan untuk diuji aktivitas katalitiknya pada reaksi transformasi glukosa menjadi 5-HMF. Reaksi katalitik diuji pada larutan glukosa 10 w/v dengan volume 3 mL dengan kondisi suhu 140oC dan variasi waktu 3, 6, dan 8 jam. Hasil terbaik yang di dapatkan berupa yield dari 5-HMF sebesar 5.58 pada waktu 8 jam. "hr>" "b>ABSTRACT
" Yttrium metal organic framework Y MOF was successfully synthesized by using solvothermal method. In this research, temperature variation 100o C, 120o C, and 140o C was introduced in this Y MOF synthesis. Characterization of Raman and XRD pointed out the best crystalline characteristic was generated in 120o C. Characterization of FTIR, 1H NMR, and Raman confirmed that Yttrium Trivalent has coordination bond with DMF as ligand and BDC as linker. These four characterizations concluded that Y MOF had similar character to Yb MOF MB2 . With this similarity, it was expected that the structure would be similar too. This research also analyzed the catalytic activity on transformation reaction of glucose to 5 HMF. Catalytic reaction was carried out by using 3 mL glucose 10 w v in 140o C with time variation 3, 6, and 8 hours. The best yield result was 5.58 of 5 HMF in 8 hours.

Abstrak :
A phase field model has been successfully constructed to simulate the behavior of the semi-crystalline polymer solidification phenomenon. It is a model that has been widely and successfully utilized to simulate solidification phenomena in metals. However, the non-conserved phase field equation can be extended to include unique polymer parameters that do not exist in metals; for example, polymer melt viscosity and the diffusion coefficient. In order to extend this model, we incorporate free energy density and non-local free energy density based on the Harrowell-Oxtoby and Ginzburg-Landau theorems for polymer. By using the expansion principle for the higher order of binary phase field parameter, a full modified phase field equation can be obtained. The solidification phenomenon in polymer is very important to optimize the final properties of the products. Here, we use our modified equation to investigate the effect of melting temperature on the rate of solidification. It was found that the rate of solidification is correlated with melting temperature in a non-straightforward manner.