Papers by Keyword: Binding

Abstract: Composite material represents a complex multi-material structure consisting of coincidence array and reinforcing agent. Basalt continuous fibre and basalt composite material processing technique is one of the present day promising area. With all high characteristics of basalt fibre and basalt made products the ways of it refinement are nowhere near exhausted and one of that ways is nanomodification of the binding agents used in composite production. In this paper quoted the results of the silicate - type nanoparticle retooling influence on mechanical and physical properties of epoxianhydride binding for the purpose of lifting strength and viscoelastic properties of basalt fibre composite. It is found that the appliance of the silicate nanoparticles in epoxianhydride binding between 0.25 to 1 mass. % improve stress-related properties per 10-45%, micro plastics interlaminar shear strength increase by 25-28%, increase of dynamic modulus of elasticity - 30%, mechanical and physical properties of basalt fibre reinforced polymer based on nanomodified binder - 20%. Conducted research efforts show transmission of increased characteristics by nanomodification of epoxianhydride binding onto the characteristics of basalt fibre composite materials.

Abstract: A thermodynamic analysis of the reactions of calcium chloride and calcium nitrate with tricalcium aluminate when used as a hardening accelerator for portland cement, as well as decomposition reactions of calcium hydrochloraluminate (CHChA) and calcium hydronitroalyuminate (CHNA) formed during the hardening was performed. The conditions of stable existence of CHChA and CHNA in the cement matrix were established.

Abstract: The aim of this study was to compare the in vitro binding of bile salts by coconut fiber, a by-product of coconut milk extraction. The raw coconut fiber was processed by different methods before binding test, that is, sieving, pulverizing in mortar, grinding by a dry grinder, digesting with 0.1 N hydrochloric acid (HCl), grinding by a dry grinder and then digesting with 0.1 N HCl. The resultant coconut fiber was sieved to obtain the particle size ranged from 250 to 600 μm. Various bile salts, i.e., sodium deoxycholate, sodium cholate and sodium taurocholate, were individually tested and analyzed by high performance liquid chromatography. The results showed that sodium deoxycholate was bound by sieved coconut fiber (9.64%), mortar-ground coconut fiber (12.91%), grinder-ground coconut fiber (28.31%), acid-digested coconut fiber (41.14%), and grinder-ground and acid-digested coconut fiber (37.54%). Similar results were obtained when sodium cholate and sodium taurocholate were tested but to a lesser extent. It can be concluded from these results that coconut fiber may have potential application as a cholesterol-reducing agent.

Abstract: Extracellular polymeric substances (EPS) in marine algae- Platymonas subcordiformis affected by enrofloxacin (ENR), the typical quinolone antibiotics released to the environment through different ways, was studied. A 3-dimension EEM (excitation –emission matrix) fluorescence spectroscopy was used to examine the interaction between EPS and ENR, and the fluorescent peaks A and B were detected, whose fluorescence intensity remarkably decreased with the increased ENR concentration. It was demonstrated that the interaction of EPS with ENR well fitted the modified Stern-Volmer. It was concluded that the presence of EPS in marine algae affected the transport and transform of antibiotics in aquatic environment.

Abstract: Humic acid plays an important role in regualting the physical, chemical and biological properties in aquatic systems. In this paper, photochemical degradation of humic acid and its effect on the copper binding coefficient were studied. Results showed that the copper binding coefficient decreased with increased irradiation time. The decrease of copper binding coefficient was significantly correlated with the humic acid structure parameters (SUVA270 and E2/E3) during the photodegradation. It suggested that photodegradation of humic acid may have effects on the bioaccumulation of copper and hence its toxicity to aquatic organisms.

Abstract: The chloride binding capacity of aluminate hydrates in cement-based composite materials is investigated. The total chloride contents and free chloride contents were analyzed by acid-soluble method and water-soluble method. The chemical interaction of chloride with the hydrates of aluminate phases in cement was also studied by X-ray diffraction. Test results show that the monosulfate hydrate has chloride binding capacities, whereas ettringite has no capacity to bind chloride. The chloride binding by monosulfate hydrate is attributed to the formation of Friedel’s salt and Kuzel’s salt by the ion exchange of SO42- with Cl- and the nonlinear relationship can be represented best by a Freundlich isotherm.

Abstract: Binding of bile salts by dietary fiber is believed to promote their excretion and hence to reduce the serum cholesterol level in man and experimental animals. In this study, the binding efficiency of soluble pectin from various sources, i.e., apple, citrus and pomelo, was examined. Sodium deoxycholate and sodium cholate hydrate were used as a model to represent bile salt in human body. The binding efficiency was assayed by acid reaction, thin layer chromatography (TLC) and enzyme cycling method. The results demonstrated that enzyme cycling method was the most suitable for assaying the in-vitro binding of bile salts while the TLC was not very sensitive, i.e., low amount of bile salts cannot be detected by TLC. Excess pectin from binding test could also interfere the acid reaction method even though the centrifugation was used to remove the excess pectin. When the concentration of pectin was increased, the binding efficiency with sodium deoxycholate increased. However, at 1% w/w of pectin, the binding efficiency decreased. The exception is for pomelo pectin in which the binding efficiency increased when the pectin concentration increased. With sodium cholate hydrate, only slight difference in binding efficiency was observed for all types and concentrations of pectin. The results indicate that the ability to bind bile salts of pectin might be responsible for its hypocholesterolemic action observed in experimental animals and humans.

Abstract: Erythromycin molecularly imprinted polymeric microspheres（EM-MIPMs) which have good shape and well-distributed size were prepared by suspension polymerization in aqueous phase, using EM as a template and methacrylic acid (MAA) as a functional monomer. The size of MIPMs is about 50.17 μm characterized by laser particle size analyzer and polarizing microscope. The interaction between the template and monomer, and selective binding performance were investigated by ultraviolet spectrum analysis, equilibrium binding experiments and Scatchard analysis. The results show tha t hydrogen bonding may contribute to the interaction between EM and MAA, EM-MIPMs demonstrated much higher adsorption capacity compared with the NMIPMs. It has also been found that there are two kinds of binding sites in EM-MIPMs and only one kind in NMIPMs.

Abstract: The influence of the way and the volume of adding lime dust to fly ash-cement pastes on chloride physical adsorption capacity, chemical combination capacity and binding capacity of fly ash-cement pastes is investigated by adsorption equilibrium method. The results show that with the volume of lime dust as cement replacement raising, the amount of chloride physically adsorbed by fly ash-cement pastes reduces, while the amount of chloride chemical combining is firstly increase, and then decrease, and it reaches the maximum when the lime dust content is 10% , that of chloride binding is firstly increase, and then decrease, which reaches the maximum when the lime dust content is 5%. In addition, with the volume of lime dust as fly ash replacement increasing , the volume of chloride physically adsorbed by fly ash-cement pastes reduces firstly, and then raises, reaching the minimum when the lime dust content is 6%. Whereas, volume of chloride chemical combining and binding both decrease gradually with the increase of lime dust contents. When the population of lime dust as cement or fly ash replacement is low(less than 15% for cement and 9% for fly ash), effect of lime dust content on chloride binding capacity of fly ash-cement pastes is not obvious (under 7.5%).

Abstract: A kind of compact bending dielectric elastomer actuator is designed and manufactured using VHB4910 as the actuating material. In the contrastive experiments, the maximum displacement of 6.1mm can be achieved, and on the voltage differences of 0.9kv, the active bending of actuator is 8.1°. The research of dielectric elastomer actuator can provide an instruction for the design, analysis and implementation of this kind of actuator.