Synthesis and order–disorder transition in a novel metal formate framework of [(CH3)2NH2]Na0.5Fe0.5(HCOO)3]

2014 ◽  
Vol 43 (45) ◽  
pp. 17075-17084 ◽  
Author(s):  
Mirosław Mączka ◽  
Adam Pietraszko ◽  
Lucyna Macalik ◽  
Adam Sieradzki ◽  
Justyna Trzmiel ◽  
...  
Keyword(s):  
Phase Transition ◽  
Synthesis And Characterization ◽  
Disorder Transition ◽  
Metal Formate

We report the synthesis and characterization of a novel metal formate templated by dimethylammonium cations, [(CH3)2NH2][Na0.5Fe0.5(HCOO)3], exhibiting phase transition at 167 K.

Synthesis and characterization of CO2-sensitive temperature-responsive catalytic poly(ionic liquid) microgels

2018 ◽  
Vol 9 (21) ◽  
pp. 2887-2896 ◽  
Author(s):  
Shoumin Chen ◽  
Xuezhen Lin ◽  
Zhenghao Zhai ◽  
Ruyue Lan ◽  
Jin Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Ionic Liquid ◽  
Synthesis And Characterization ◽  
Volume Phase Transition ◽  
Phase Transition Behavior ◽  
Volume Phase ◽  
Temperature Responsive ◽  
Transition Behavior ◽  
Poly Ionic Liquid

A class of poly(ionic liquid) microgels exhibiting CO2-switchable temperature-responsive volume phase transition behavior have been synthesized and used for CO2 fixation.

Synthesis and characterization of a new organic–inorganic hybrid ferroelectric: (C4H10N)6[InBr6][InBr4]3·H2O

2019 ◽  
Vol 48 (46) ◽  
pp. 17402-17407 ◽  
Author(s):  
Wen-Bo Xin ◽  
Guan-Cheng Xu ◽  
Min Li
Keyword(s):  
Phase Transition ◽  
Ferroelectric Phase Transition ◽  
Ferroelectric Phase ◽  
Order Transition ◽  
Synthesis And Characterization ◽  
Inorganic Hybrid ◽  
Compound C

Compound (C4H10N)6[InBr6][InBr4]3·H2O undergoes a paraelectric–ferroelectric phase transition at 232 K, which triggered by the disorder–order transition of Br atoms in [InBr4]− anions.

Temperature-Sensitive Nanogels PNIPAAm/DMA Prepared and Research

2012 ◽  
Vol 465 ◽  
pp. 141-145
Author(s):  
Hai Yan Wang ◽  
Qian Liao ◽  
Qiao Lan Shao ◽  
Gao Qiu ◽  
Xi Hua Lu
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Synthesis And Characterization ◽  
Temperature Sensitive ◽  
Volume Phase Transition ◽  
Volume Phase ◽  
New Class ◽  
Copolymer Gels ◽  
Temperature Controlled

There have much study about thermo-responsive nanogels,which exhibit temperature-controlled volume phase transitions.There have been few reports,however,of electrostatically neutral,thermosensitive nanogels with a high composition of hydrophilic monomer.Here,we describe the synthesis and characterization of a new class of nonionic copolymer nanogels based on N-ispropylacrylamide(NIPAM) and N,N-dimethylacrylamide(DMA),wich exhibit tunable volume phase transition temperatures.And increasing percentages of DMA in copolymer gels raises the LCST,and attenuates and broadens the volume phases transition.Through DLS, AFM and UV-Vis measurement it's size,shape and VPTTs.The character of nonionic NIPAM/DMA nanogels show it's tunable phase transitions promise to be useful for applicatipns in biotechnology and medicine.

Synthesis and characterization of (Cu1−xAgx)2ZnSnS4 nanoparticles with phase transition and bandgap tuning

2020 ◽  
Vol 31 (7) ◽  
pp. 5760-5768
Author(s):  
Ning Liu ◽  
Fei Xu ◽  
Yan Zhu ◽  
Yongmao Hu ◽  
Guitang Liu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Synthesis And Characterization ◽  
Bandgap Tuning

Synthesis and Characterization of β-Cyclodextrin Microspheres with Temperature and pH Sensibility

2012 ◽  
Vol 583 ◽  
pp. 391-394 ◽  
Author(s):  
Qiang Zhang ◽  
Li Qin You ◽  
Chun Shan Zhu
Keyword(s):  
Phase Transition ◽  
Grain Size ◽  
Succinic Anhydride ◽  
Ph Value ◽  
Synthesis And Characterization ◽  
Ph Values ◽  
Swelling Rate

The β-CD/NIPAAm-SA microspheres with temperature and pH sensibility were synthesized with β-cyclodextrin(β-CD), N-isopropylacrylamide(NIPAAm) and succinic anhydride(SA), and their drug-releasing properties were investigated. SEM showed that the β-CD/NIPAAm-SA microspheres had a good sphericity and a grain size of 200-300µm.And the swelling results indicated that the swelling rate was decreased with temperature raising and increased with pH value improving, and the phase transition volume changed suddenly at the temperature of about 27°C and 38°C, and the pH values of about 1.4 and 7.4. It revealed that the β-CD/NIPAAm-SA microspheres had pH and temperature sensibilities.

scholarly journals POSS Hybrid Robust Biomass IPN Hydrogels with Temperature Responsiveness

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 524 ◽  
Author(s):  
Yi Chen ◽  
Yueyun Zhou ◽  
Wenyong Liu ◽  
Hejie Pi ◽  
Guangsheng Zeng
Keyword(s):  
Phase Transition ◽  
Tensile Deformation ◽  
Drug Loading ◽  
Synthesis And Characterization ◽  
Volume Phase Transition ◽  
Target Drug ◽  
Isopropyl Acrylamide ◽  
Biomedical Field ◽  
Oligomeric Silsesquioxane

In order to improve the performance of traditional sodium alginate (SA) hydrogels cross-linked by Ca2+ ions to meet greater application demand, a strategy was designed to structure novel SA-based gels (named OP-PN gels) to achieve both stimulus responsiveness and improved mechanical strength. In this strategy, the SA chains are co-cross-linked by CaCl2 and cationic octa-ammonium polyhedral oligomeric silsesquioxane (Oa-POSS) particles as the first network, and an organically cross-linked poly(N-isopropyl acrylamide) (PNIPA) network is introduced into the gels as the second network. Several main results are obtained from the synthesis and characterization of the gels. For OP-PN gels, their properties depend on the content of both uniformly dispersed Oa-POSS and PNIPA network directly. The increased Oa-POSS and PNIPA network content significantly improves both the strength and resilience of gels. Relatively, the increased Oa-POSS is greatly beneficial to the modulus of gels, and the increased PNIPA network is more favorable to advancing the tensile deformation of gels. The gels with hydrophilic PNIPA network exhibit better swelling ability and remarkable temperature responsiveness, and their volume phase transition temperature can be adjusted by altering the content of Oa-POSS. The deswelling rate of gels increases gradually with the increase of POSS content due to the hydrophobic Si–O skeleton of POSS. Moreover, the enhanced drug loading and sustained release ability of the target drug bovine serum albumin displays great potential for this hybrid gel in the biomedical field.

Laboratory synthesis and characterization of Knasibfite K3Na4[SiF6]3[BF4] and the homologous Ge compound K3Na4[GeF6]3[BF4]

2020 ◽  
Vol 235 (8-9) ◽  
pp. 247-254
Author(s):  
Jascha Bandemehr ◽  
Josefin Klippstein ◽  
Sergei I. Ivlev ◽  
Malte Sachs ◽  
Florian Kraus
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Raman Spectra ◽  
Hydrofluoric Acid ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Infrared And Raman Spectra ◽  
Monoclinic Structure ◽  
Laboratory Synthesis

AbstractHerein we present the synthesis, crystal structure, and the infrared and Raman spectra of K3Na4[SiF6]3[BF4]. The compound also occurs in nature as the mineral Knasibfite. We obtained it from the reaction of stoichiometric amounts of SiO2, Na[BF4], K2CO3, and Na2CO3 in hydrofluoric acid at room temperature. Hydrofluorothermal synthesis at 200 °C lead to a product of higher purity. Knasibfite is colorless and crystallizes in space group Im 2m with a = 5.546(2), b = 9.261(2), c = 17.184(4) Å, V = 882.5(4) Å3, Z = 2, at T = 400(2) K. At 342 K a phase transition to a monoclinic structure was observed (I 2, a = 5.5003(6), b = 9.0890(9), c = 17.0048(2) Å, β = 90.041(9)°, V = 852.2(2) Å3, Z = 2, T = 100(2) K). By replacing SiO2 with GeO2 as a starting material K3Na4[GeF6]3[BF4] was obtained. This compound also crystallizes in form of two polymorphs, both of which are isotypic to the respective ones of K3Na4[SiF6]3[BF4].

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