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Responsive Composite Janus Cages

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Chinese Journal of Polymer Science 2015年第10期33卷 1462-1469页

作者： Qi-guang Wang 梁福鑫 Qian Wang Xiao-zhong Qu 杨振忠 State Key Laboratory of Polymer Physics and Chemistry Institute of Chemistry Chinese Academy of Sciences

pH responsive composite Janus cages of PS-silica-PEO are prepared using silica nanoparticles to crosslink two PAA contained di-block copolymers at an emulsion.interface sequentially. Transverse channels are in situ created across the shell, which facilitates mass transfer. Shell is pH responsive owing to the presence of residual PAA chains tethered onto the silica nanoparticles. The Janus cages are capable to preferentially capture oil from their aqueous surroundings. The saturation absorption capacity is determined by pH and oil property. Other composite Janus cages are expected by extension the method using other copolymers and functional nanoparticles.

关键词： Janus cages Block copolymer Composited pH response emulsion.

Monte Carlo simulation for the micellar behavior of amphiphilic comb-like copolymers

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Science China Chemistry 2000年第4期43卷 366-374页

作者：冯莺隋家贤赵季若陈欣方 Qingdao Institute of Chemical Technology Qingdao 266042 China Material Department of Jilin University Changchun 130021 China

Micellar behaviors in 2D and 3D lattice models for amphiphilic comb-like copolymers in water phase and in water/oil mixtures were simulated. A dynamical algorithm together with chain reptation movements was used in the simulation. Three-dimension displaying program was programmed and free energy was estimated by Monte Carlo technique. The results demonstrate that reduced interaction energy influences morphological structures of micelle and emulsion.systems greatly; 3D simulation showing can display more direct images of morphological structures; the amphiphilic comb-like polymers with a hydrophobic main chain and hydrophilic side chains have lower energy in water than in oil.

关键词： Monte Carlo method amphiphile emulsion.

Effects of external D. C. electric fields on friction and wear behavior of alumina/brass sliding pairs

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Science China(Technological Sciences) 1998年第6期41卷 617-625页

作者：蒋洪军孟永钢温诗铸 1. National Tribology Laboratory Tsinghua University 100084 Beijing China

A plate/plate type test rig, in which one end face of the alumina cylinder test piece rubs reciprocally against a static brass plate at a low speed, was developed for measuring friction coefficient and weight loss under different electric field conditions. emulsion.of 1wt% zinc stearate dispersed in deionized water was used as lubricant in the experiments. Experiment results show that the friction coefficient can be obviously affected by the presence of positive voltages (the voltages in which the lower specimen was used as cathode were called positive voltages or "+" voltages, while the voltages with a reverse polarity were called negative voltages or "-" voltages). A+20D.C.V voltage can lead to a dramatic increase of friction coefficient by up to 200%. When the external voltage is turned on and off periodically, the friction coefficient goes up and down almost synchronously. The average response time is 1 min. The preliminary analytic results imply that the equilibrium between the generation and destruction of the boundary films composed of stearate on the sliding surface was changed by the applied external electric fields. By consideration of the dramatic increase of friction coefficient and the rapid response to the external voltage, it is expected that active controlling of friction coefficient by external electric fields is feasible.

关键词： friction control boundary films electric field zinc stearate emulsion.

Co-encapsulation of bioactives for food applications

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Food Quality and Safety 2017年第4期1卷 302-309页

作者： Punit Jatin Chawda John Shi Sophia Xue Siew Young Quek Food Science School of Chemical SciencesThe University of AucklandAucklandNew Zealand Guelph Research and Development Center Agriculture and Agri-Food CanadaGuelphOntario N1G 5C9Canada

Co-encapsulation of bioactive is an emerging field which shows promising approach to develop functionally active food products. Health-promoting components including antioxidants, vitamins, essential oils or flavors, and antimicrobials could be successfully delivered in functional foods by co-encapsulating in suitable wall matrix. Co-encapsulation is especially useful as this concept takes into account the synergistic effect of multiple bioactives in enhancing bioactivity to target specific health benefits. The review focusses on various factors governing the stability of the microencapsulated system such as drying methods and temperature, selection of wall material, surfactant, co-excipient, emulsion.homogenizing speed, and appropriate combination of the bioactive for co-encapsulation to get synergistic effects. Effective results have been demonstrated by several researchers, but further studies would help in unravelling the full potential of this technique in food system.

关键词： Co-encapsulation Microencapsulation Functional food Bioactive Stability Spray drying emulsion.

On the Mechanism of Latex Particles Formation in Polymerization in Heterogeneous Monomer-Water System

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Journal of Chemistry and Chemical Engineering 2015年第5期9卷 363-368页

作者： Amos Arshaki Hovhannisyan Mishal Khaddazh Gayane Karlosi Grigoryan Narine Gevork Grigoryan The Scientific Technological Centre of Organic and Pharmaceutical Chemistry NAS RA Institute of Organic Chemistry 26 Yerevan0014 Armenia

Investigations show that in monomer water heterogeneous systems polymerization, located in the interface, can disperse the system. Following polymerization in the density gradient field it is shown that in such systems latex particles are nucleated from monomer microdroplets, containing a certain amount of polymer molecules. It could be considered that, independently of the nature of the monomer itself, polymerization in monomer water statistic heterogeneous systems modulate emulsion.polymerization process.

关键词： Polymerization static system density gradient turbidity emulsion.