We present the phase diagrams for neutral patchy colloidal particles whose surface is decorated by different number of identical patches,where each patch serves as an associating site.The hard-core Lennard-Jones(LJ)po...We present the phase diagrams for neutral patchy colloidal particles whose surface is decorated by different number of identical patches,where each patch serves as an associating site.The hard-core Lennard-Jones(LJ)potential and associating interaction are incorporated into the free energies of patchy particles in phases of the uid(F),random close packing(RCP),and face-centered-cubic(FCC)crystal.A rich phase structure of patchy particles with F-F,F-RCP,and F-FCC transitions can be observed.Meanwhile,the sol-gel transition(SGT)characterizing the connectivity of patchy particles is also investigated.It is shown that,depending on the number of patches and associating energy,the F-F transition might be metastable or stable with respect to the F-RCP and F-FCC transitions.Meanwhile,the critical temperatures,critical densities,triple points,and SGT can be significantly regulated by these factors.展开更多
Lokum （Turkish delight） is a high sugar and starch containing food. Since the major deterioration factor affecting the storability of lokum is moisture gain or loss, the effect of the possible ambient conditions （3...Lokum （Turkish delight） is a high sugar and starch containing food. Since the major deterioration factor affecting the storability of lokum is moisture gain or loss, the effect of the possible ambient conditions （32%, 53%, 75% RH and 15, 25, 35 ℃） on weight change and firmness of tokum was determined to estimate its structural changes. The variations in thermal properties of lokurn samples stored at different RH （32, 53, 65, 75, and 85% RH） were also determined. Increasing RH decreased glass transition of lokum samples, and two glass transitions （Tg） were observed at 75 and 85% RH. The presence of the second Tg could be related with phase separation which was increased with increasing moisture content and RH. Lokum should be kept at around 50% RH and 15℃, higher storage RH＇s and temperatures will cause the product to become unacceptable by the consumer within 20 days.展开更多
Molecular dynamic simulations are performed to study the nanoscratching behavior of polymers.The effects of scratching depth,scratching velocity and indenter/polymer interaction strength are investigated.It is found t...Molecular dynamic simulations are performed to study the nanoscratching behavior of polymers.The effects of scratching depth,scratching velocity and indenter/polymer interaction strength are investigated.It is found that polymer material in the scratching zone around the indenter can be removed in a ductile manner as the local temperature in the scratching zone exceeds glass transition temperature Tg.The recovery of polymer can be more significant when the temperature approaches or exceeds Tg.The tangential force,normal force and friction coefficient increase as the scratching depth increases.A larger scratching velocity leads to more material deformation and higher pile-up.The tangential force and normal force are larger for a larger scratching velocity whereas the friction coefficient is almost independent of the scratching velocities studied.It is also found that stronger indenter/polymer interaction strength results in a larger tangential force and friction coefficient.展开更多
基金supported by the National Natural Science Foundation of China(No.21374028 and No.21306034)the Natural Science Foundation of Hebei Province(No.B2014201103)+2 种基金the Project for Talent Engineering of Hebei Province(No.A2016015001)the Project for Top Young Talent of Hebei Provincethe Project for Top Young Talent of General Colleges of Hebei Province(No.BJ2017017)
文摘We present the phase diagrams for neutral patchy colloidal particles whose surface is decorated by different number of identical patches,where each patch serves as an associating site.The hard-core Lennard-Jones(LJ)potential and associating interaction are incorporated into the free energies of patchy particles in phases of the uid(F),random close packing(RCP),and face-centered-cubic(FCC)crystal.A rich phase structure of patchy particles with F-F,F-RCP,and F-FCC transitions can be observed.Meanwhile,the sol-gel transition(SGT)characterizing the connectivity of patchy particles is also investigated.It is shown that,depending on the number of patches and associating energy,the F-F transition might be metastable or stable with respect to the F-RCP and F-FCC transitions.Meanwhile,the critical temperatures,critical densities,triple points,and SGT can be significantly regulated by these factors.
文摘Lokum （Turkish delight） is a high sugar and starch containing food. Since the major deterioration factor affecting the storability of lokum is moisture gain or loss, the effect of the possible ambient conditions （32%, 53%, 75% RH and 15, 25, 35 ℃） on weight change and firmness of tokum was determined to estimate its structural changes. The variations in thermal properties of lokurn samples stored at different RH （32, 53, 65, 75, and 85% RH） were also determined. Increasing RH decreased glass transition of lokum samples, and two glass transitions （Tg） were observed at 75 and 85% RH. The presence of the second Tg could be related with phase separation which was increased with increasing moisture content and RH. Lokum should be kept at around 50% RH and 15℃, higher storage RH＇s and temperatures will cause the product to become unacceptable by the consumer within 20 days.
基金supported by the National Natural Science Foundation of China (Grant No.90923038)the National Basic Research Program of China (Grant No.2011CB706703)+1 种基金"111"project (Grant No.B07014)by the State Administration of Foreign Experts Affairs and the Ministry of Education of China
文摘Molecular dynamic simulations are performed to study the nanoscratching behavior of polymers.The effects of scratching depth,scratching velocity and indenter/polymer interaction strength are investigated.It is found that polymer material in the scratching zone around the indenter can be removed in a ductile manner as the local temperature in the scratching zone exceeds glass transition temperature Tg.The recovery of polymer can be more significant when the temperature approaches or exceeds Tg.The tangential force,normal force and friction coefficient increase as the scratching depth increases.A larger scratching velocity leads to more material deformation and higher pile-up.The tangential force and normal force are larger for a larger scratching velocity whereas the friction coefficient is almost independent of the scratching velocities studied.It is also found that stronger indenter/polymer interaction strength results in a larger tangential force and friction coefficient.
