The non-combustibility of PTFE fabric0s was investigated by Cone Calorimeter in this paper. Ignition parameter, heat release parameter, mass loss parameter and smoke parameter of PTFE fabrics were obtained. The Time to Ignition of PTFE fabric and PTFE/Nomex fabric were 60 and 24s respectively, and the Heat Release Rate were 9.28 and 65.52kw/m2 respectively. The Total Heat Release of PTFE fabric and PTFE/Nomex fabric increased with time, and the Total Heat Release of PTFE/Nomex was much higher than that of PTFE fabric. The Effective Heat of Combustion were 5.06 and 9.94mj/kg respectively, the maximum of mass loss rate of PTFE fabric was larger than that of PTFE/Nomex fabric, and the curve of mass loss rate of PTFE fabric changed rather slightly. It can be concluded that the non-flame properties of PTFE fabric was more remarkable than that of PTFE/Nomex fabric.
The natural vegetable dye grape seed extract (GSE) was applied on the direct dyeing of lyocell knitted fabric. By changing the dyeing condition, the modified process was derived after evaluating various fastnesses of the dyed fabric. The direct dyeing method should be under the condition of GSE’s concentration 5g/L, bath preparation temperature 80°C, pH value 3, bath ratio 1:30, dyeing time 60min. The color is very sensitive to pH and GSE’s concentration. The rubbing fastness, washing fastness and light fastness is good, the acid perspiration fastness is better than the alkaline perspiration fastness.
An electrochemical sensor for the detection of Cu (II) ion is described by using poly (vinyl alcohol) (PVA) and carboxylic multi-walled carbon nanotubes (c-MWNT) modified glassy carbon electrode (GCE) by anodic stripping voltammetry (ASV). PVA/c-MWNT film greatly improves the sensitivity of determining Cu (II). The striping peak currents change linearly with the concentration of Cu (II) from 1.0×10-8to 8.0×10-5mol/L for an accumulation time of 200 s, correlation coefficient r = 0.9980. The detection limit is as low as 5.0×10-9mol/L. The high sensitivity, selectivity, and stability of the PVA/c-MWNT film demonstrated its practical application.
A novel chromogenic system of Pb2+ with 4, 5- dibromo- o- nitrophenylfluorone (DBONPF) was developed by the synergetic effect of carboxylic carbon nanotubes (c-CNTs) and cationic surfactants CTMAB. The absorption of Pb2+ by DBONPF can be improved by the addition of a nano-material and a surfactant. Comparative experiments proved that the absorption of the complex of Pb- DBONPF was increased by 153.9% due to the conjugated system of the c-CNTs and the solubilization of CTMAB. The proposed method was applied to the determination of pb2+ in cosmetics satisfactorily
A novel silver-doped poly (p-aminobenzene sulfonic acid) modified electrode was fabricated, of which the electrochemical behaviors were studied with H2O2as a probe. In pH 7.0 PBS, a sensitive reductive peak of H2O2was observed. The modified electrode is of potential in practice for analysis of H2O2in samples such as milk.
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