Synthesis of pure silica from rice husk ash as an anti–caking agent for fertilizer industry In Vietnam - Nguyen Huu HieuIn this study, the silica from RHA was successfully synthesized by precipitation method at pH 7. The effect of experimental factors on the purity and the extracted yield of silica were studied and suitable synthesized conditions were determined as 1 N of NaOH, 120 minutes of reaction time, 5 N of HCl and 50 % volume of ethanol in the washing sol...
9 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 1063 | Lượt tải: 1
Enzymatic preparation of modulated– biodegradable hydrogel nanocomposites based chitosan/gelatin and biphasic calcium phosphate nanoparticles - Nguyen Tien ThinhIn situ forming hydrogel composites consisted of tyramine conjugated gelatin, 4–hydroxyphenylacetic acid conjugated chitosan and BCP were successfully prepared via horseradish peroxidase mediated reaction in the presence of hydrogen peroxide. With a rapid gelation time at the physiological condition and controllable biodegradation rate, the hydr...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 728 | Lượt tải: 0
Catalyst–free growth of well–aligned zno nanowires on graphene/si substrateby thermal evaporation - Tran Van KhaiIn conclusion, vertically well–aligned ZnO NW arrays have been successfully synthesized on graphene/Si substrate without catalyst or additives by a simple thermal evaporation method. The as–synthesized ZnO NWs had diameters in the range of 300–350 nm, lengths over several tens micrometers. The SEM, HRTEM, XRD and Raman measurements revealed that...
11 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 897 | Lượt tải: 0
Effect of poly(methyl methacrylate) molecular weight on its ternary polymer blends micro– structure using x–ray computed tomography - Hoa T. NguyenResearch about the molecular–weight dependance on blends polymer X–CT images, we have demonstrated visually the dependance of PMMA molecular–weight (3 types of Mw) in blends PMMA/PA12/PP 1/1/1 using 3D X–CT microstructure analyzing system; and how about the phase structure of a ternary blends with 3D images. Learn how about the preparation of s...
5 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 991 | Lượt tải: 0
Synthesis and characterization of monofunctional benzoxazine from cardanol - Cao Xuan VietIn this paper we described the successfull synthesis and characterization of a monofunctional benzoxazine monomer from cardanol, a by-product of cashew industry by a solventless method. The monomer structure were confirmed by the FTIR and 'H NMR spectroscopy. DSC results indicates that the long alkyl chain substituent at the meta position in C-Bz a...
9 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 733 | Lượt tải: 0
Synthesis of an azide–thiol linker for heterogeneous polymer functionalization via the “click” reaction - Thuy Thu TruongBy utilization of a four-step procedure, 4-azidomethyl)benzyl thiol was successfully prepared and the conditions of step II (mesylation of alcohol to methylsulfonate) were optimized. This compound bearing both the azide and thiol functionalities was further used to couple with an allyl-functionalized PU foam via the thiol-ene “click” reaction, wher...
8 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 758 | Lượt tải: 0
A synthesis of solid acid catalysts for using in hydrolysis of cellulose from rice straw into glucose - T–Que Phuong PhanRice straw treated with the two–stage process composed of separating hemicellulose with acid sulfuric and lignin by the aid of sulfomethylation agent for 7 h may be used as raw material for hydrolysis reaction of cellulose into glucose in support of the catalyst. Successful synthesized carbon catalyst containing –SO3H functional groups via hydro...
7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 774 | Lượt tải: 0
Synthesis of microcapsules from prepolyurethanes - Ha La Thi ThaiLiquid TDI microcapsules were successfully synthesized by interfacial polymerization of PU prepolymer in oil–in–water emulsion. Spherical microcapsules with average diameter in the range 90 – 240 µm were manufactured by adjusting agitation rate over the range 1200–800 rpm. The core in microcapsules was about 40.5 wt% at agitation rate 1000 rpm, ...
7 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 772 | Lượt tải: 0
Copper and lead recovery from discarded printed circuit boards by electrolysing leached solution - Tran Thi Phuong ThaoThe cathodic deposition efficiencies reported in Table 3, are considerably high above 90 % and tend to decrease with increasing current density in the investigated range from 30 to 50 mA/cm'. In contrary, lead recovery efficiencies are increased with current densities in same range with a sharp rise is observed at 50 mA/cm current density (Table 4)...
9 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 1014 | Lượt tải: 0
Removal of cd(ii) from water by using graphene oxide–mnfe2o4 magnetic nanohybrids - Nguyen Huu HieuThe curcumin-loaded PCL/CTS nanofibers were successfully fabricated via electrospinning method to be used for testing curcumin release in vitro. The optimum parameters for electrospinning operation are: PCL/CTS = 9/1, U= 15 kV, L = 8 cm, Q = 0.3 mL/h. The fibers fabricated using these parameters have good morphology with the average diameter from 2...
13 trang | Chia sẻ: honghp95 | Ngày: 02/12/2020 | Lượt xem: 710 | Lượt tải: 0
