Influence of shear on the structures and properties of regenerated silk fibroin aqueous solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (77) ◽  
pp. 62936-62940 ◽  
Author(s):  
Yuan Jin ◽  
Yichun Hang ◽  
Qingfa Peng ◽  
Yaopeng Zhang ◽  
Huili Shao ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Shear Rate ◽  
Aqueous Solutions ◽  
Crystal Structures ◽  
Silk Fibroin ◽  
Structures And Properties ◽  
Regenerated Silk Fibroin

Regenerated silk fibroin molecules in aqueous solutions gradually form rod-like liquid crystal structures after being applied sufficient shear rate and shear time.

Role of Ca2+on structures and properties of regenerated silk fibroin aqueous solutions and fibres

2014 ◽  
Vol 18 (sup2) ◽  
pp. S2-113-S2-115 ◽  
Author(s):  
Y. Jin ◽  
Y. C. Hang ◽  
Y. P. Zhang ◽  
H. L. Shao ◽  
X. C. Hu
Keyword(s):  
Aqueous Solutions ◽  
Silk Fibroin ◽  
Structures And Properties ◽  
Regenerated Silk Fibroin

Hybrid Silk Fibers Dry-Spun from Regenerated Silk Fibroin/Graphene Oxide Aqueous Solutions

2016 ◽  
Vol 8 (5) ◽  
pp. 3349-3358 ◽  
Author(s):  
Chao Zhang ◽  
Yaopeng Zhang ◽  
Huili Shao ◽  
Xuechao Hu
Keyword(s):  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Silk Fibroin ◽  
Silk Fibers ◽  
Regenerated Silk Fibroin

A comparison of centrifugally-spun and electrospun regenerated silk fibroin nanofiber structures and properties

RSC Advances ◽  
2015 ◽  
Vol 5 (119) ◽  
pp. 98553-98558 ◽  
Author(s):  
Chen Liu ◽  
Jiaqi Sun ◽  
Min Shao ◽  
Bin Yang
Keyword(s):  
Thermal Properties ◽  
Silk Fibroin ◽  
Secondary Structures ◽  
Random Coil ◽  
Structures And Properties ◽  
Regenerated Silk Fibroin ◽  
Centrifugal Spinning ◽  
Β Sheet

Centrifugal spinning converts the conformation of silk fibroin from random coil to β-sheet more easily than electrospinning, which results in fiber differences on secondary structures, orientation and thermal properties.

scholarly journals Effect of Sodium Carbonate Concentrations on the Formation and Mechanism of Regenerated Silk Fibroin Nanofibers by Electrospinning

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Hao Dou ◽  
Baoqi Zuo
Keyword(s):  
Rheological Property ◽  
Aqueous Solutions ◽  
Silk Fibroin ◽  
Sodium Carbonate ◽  
Electrospinning Process ◽  
Carbonate Concentration ◽  
Low Viscosity ◽  
Regenerated Silk Fibroin ◽  
Silk Fibroin Nanofibers ◽  
First Time

Degumming is the first process for the preparation of all silk-based products. In this paper, effect of sodium carbonate concentrations for silk degumming on the formation of electrospun silk fibroin nanofibers was investigated and the reason for the silk electrospinning process was explained for the first time by differences from the microstructure of regenerated silk fibroin. With increasing the sodium carbonate concentration, microstructure both in the aqueous solutions and in the electrospinning solutions transformed from nanofibrils to nanoparticles, leading to obvious changes on rheological property; electrospinning solutions with nanofibrils behaved like the native silk dope and owned remarkably higher viscosity than the solutions with nanoparticles showing very low viscosity. More interestingly, nanofibrils favored the formation of silk nanofibers with ease, and even nanofibers could be electrospun at concentration 2%. However, nanoparticles were completely unable to generate nanofibers at high spinning concentration 8%. Importance of sodium carbonate concentrations is heavily emphasized for impacting the microstructure types and further influencing the electrospinning performance of regenerated silk. Hence, sodium carbonate concentrations provide a controllable choice for the preparation of silk-based electrospun biomaterials with desired properties.

scholarly journals CU(Ⅱ)-INDUCED CONFORMATION TRANSITION OF REGENERATED SILK FIBROIN IN AQUEOUS SOLUTIONS

2009 ◽  
Vol 009 (10) ◽  
pp. 1056-1061 ◽  
Author(s):  
Yiming ZHONG ◽  
Yuhong YANG ◽  
Xin CHEN ◽  
Zhengzhong SHAO
Keyword(s):  
Aqueous Solutions ◽  
Silk Fibroin ◽  
Regenerated Silk Fibroin ◽  
Conformation Transition

scholarly journals Tunable Structures and Properties of Electrospun Regenerated Silk Fibroin Mats Annealed in Water Vapor at Different Times and Temperatures

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiangyu Huang ◽  
Suna Fan ◽  
Alhadi Ibrahim Mohammed Altayp ◽  
Yaopeng Zhang ◽  
Huili Shao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Vapor ◽  
Silk Fibroin ◽  
Conformational Transition ◽  
Breaking Strength ◽  
Electrospinning Technique ◽  
Structures And Properties ◽  
Regenerated Silk Fibroin ◽  
Vapor Annealing ◽  
Breaking Energy

Regenerated silk fibroin (SF) mats were fabricated using electrospinning technique, followed by mild water vapor annealing to effectively tune the structures and improve the mechanical properties of the mats at different annealing times and temperatures. The breaking strength and the breaking energy of the mats treated with water vapor at 65°C for 12 h reached 6.0 MPa and 171.7 J/kg, respectively. The conformational transition of the SF mats was significantly influenced by the treating temperature, while the influence of time was comparatively limited. The influence is consistent with the time-temperature equivalent principle and would be helpful for the preparation of water-vapor-annealed silk-based biomaterials for various applications.

Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems: synthesis and crystal structures of Rb2[(UO2)(Cr2O7)(NO3)2] and two new polymorphs of Rb2Cr3O10

2021 ◽  
Vol 236 (1-2) ◽  
pp. 11-21
Author(s):  
Evgeny V. Nazarchuk ◽  
Oleg I. Siidra ◽  
Dmitry O. Charkin ◽  
Stepan N. Kalmykov ◽  
Elena L. Kotova
Keyword(s):  
Crystal Structure ◽  
Aqueous Solutions ◽  
Crystal Structures ◽  
Hydrothermal Treatment ◽  
Ambient Conditions ◽  
Screw Axis ◽  
3D Framework ◽  
Solution Acidity

Abstract Three new rubidium polychromates, Rb2[(UO2)(Cr2O7)(NO3)2] (1), γ-Rb2Cr3O10 (2) and δ-Rb2Cr3O10 (3) were prepared by combination of hydrothermal treatment at 220 °C and evaporation of aqueous solutions under ambient conditions. Compound 1 is monoclinic, P 2 1 / c $P{2}_{1}/c$ , a = 13.6542(19), b = 19.698(3), c = 11.6984(17) Å, β = 114.326(2)°, V = 2867.0(7) Å3, R 1 = 0.040; 2 is hexagonal, P 6 3 / m $P{6}_{3}/m$ , a = 11.991(2), c = 12.828(3) Å, γ = 120°, V = 1597.3(5) Å3, R 1 = 0.031; 3 is monoclinic, P 2 1 / n $P{2}_{1}/n$ , a = 7.446(3), b = 18.194(6), c = 7.848(3) Å, β = 99.953(9)°, V = 1047.3(7) Å3, R 1 = 0.037. In the crystal structure of 1, UO8 bipyramids and NO3 groups share edges to form [(UO2)(NO3)2] species which share common corners with dichromate Cr2O7 groups producing novel type of uranyl dichromate chains [(UO2)(Cr2O7)(NO3)2]2−. In the structures of new Rb2Cr3O10 polymorphs, CrO4 tetrahedra share vertices to form Cr3O10 2− species. The trichromate groups are aligned along the 63 screw axis forming channels running in the ab plane in the structure of 2. The Rb cations reside between the channels and in their centers completing the structure. The trichromate anions are linked by the Rb+ cations into a 3D framework in the structure of 3. Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems is discussed.

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