JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Hui-Hui Zhang,Na Kong,Jie Wang,Zhi-Hong Liu
Two pure microporous copper borates (NaCuB 7 O 12 · H 2 O and KCuB 7 O 12 · H 2 O) have been synthesised and characterized by XRD, FT-IR, TG techniques and chemical analysis. The molar enthalpies of solution of NaCuB 7 O 12 · H 2 O (s) and KCuB 7 O 12 · H 2 O (s) in 1 mol · dm −3 HCl (aq) were determined to be – (24.12 ± 0.12) kJ · mol −1 and – (35.07 ± 0.08) kJ · mol −1 , respectively. The molar enthalpies of solution of 0.72 mg of NaCl (s) and 0.91 mg of KCl in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 HCl (aq) which contains 5.3 mg of H 3 BO 3 were measured, respectively. The molar enthalpies of solution of 2.09 mg of CuCl 2 · 2H 2 O (s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 HCl (aq) which contains 5.3 mg of H 3 BO 3 and 0.72 mg of NaCl/0.91 mg of KCl were also measured, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol · dm −3 HCl (aq), together with the standard molar enthalpies of formation for CuCl 2 · 2H 2 O (s), NaCl (s)/KCl (s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of – (5373.3 ± 5.6) kJ · mol −1 for NaCuB 7 O 12 · H 2 O (s) and – (5375.0 ± 5.6) kJ · mol −1 for KCuB 7 O 12 · H 2 O (s) at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles. It is obvious that KCuB 7 O 12 · H 2 O (s) is more thermal stable than that of NaCuB 7 O 12 · H 2 O (s).
研究领域:
化学热力学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2018
·
IF 2.631
Jing Miao,Kun-Xian Wu,Zhi-Hong Liu
Two pure mixed alkali-transition metal borates, Li 6 Zn 3 B 4 O 12 (s) and Na 3 ZnB 5 O 10 (s) have been synthesized and characterized by XRD, FT-IR, and chemical analysis. For Li 6 Zn 3 B 4 O 12 , the molar enthalpy of solution of Li 6 Zn 3 B 4 O 12 in the mixture solvent of {2.00 mL of 1 mol·L −1 HCl + H 3 BO 3 )(aq)} was measured. The molar enthalpies of solution of ZnO(s) in 1 mol·L −1 HCl(aq), and LiBO 2 (s) in the mixture solvent of {2.00 mL of 1 mol·L −1 HCl(aq) + ZnO(aq)} were also measured. For Na 3 ZnB 5 O 10 , the molar enthalpy of solution of Na 3 ZnB 5 O 10 in 2.00 mL of 1 mol·L −1 HCl(aq) was measured. The molar enthalpy of solution of NaBO 2 ·4H 2 O(s) in the mixture solvent of {2.00 mL of 1 mol·L −1 HCl(aq) + H 3 BO 3 + ZnO](aq)} was also measured. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol·L −1 HCl(aq), and ZnO(s) in {1 mol·L −1 HCl(aq) + H 3 BO 3 }, together with the use of the standard molar enthalpies of formation for LiBO 2 (s)/NaBO 2 ·4H 2 O(s), ZnO(s), H 3 BO 3 (s) and H 2 O(l), the standard molar enthalpies of formation of −(5867.5 ± 4.8) kJ·mol −1 for Li 6 Zn 3 B 4 O 12 and −(4655.3 ± 6.6) kJ·mol −1 for Na 3 ZnB 5 O 10 at T = 298.15 K were obtained on the basis of two appropriate thermochemical cycles.
研究领域:
物理化学
·
无机化学
·
热化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Na Kong,Hui-Hui Zhang,Jie Wang,Zhi-Hong Liu
Two pure dehydrated borogermanates with microporous structure, β -K 2 [B 2 Ge 3 O 10 ] and NH 4 [BGe 3 O 8 ], have been synthesized and characterized by XRD, FT-IR, TG techniques. The molar enthalpies of solution of 2.51 mg of GeO 2 (s)/0.99 mg of H 3 BO 3 (s)/1.98 mg of H 3 BO 3 (s) in 2.00 cm 3 of 1 mol · dm −3 NaOH (aq) were measured, respectively. The molar enthalpies of solution of 2.44 mg of K 2 B 4 O 7 · 4H 2 O (s) and 2.18 mg of NH 4 B 5 O 8 · 4H 2 O (s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 NaOH (aq) which contains 2.51 mg of GeO 2 (s) were measured, respectively. The molar enthalpies of solution of 3.82 mg of β -K 2 [B 2 Ge 3 O 10 ] (s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 NaOH (aq) which contains 0.99 mg of H 3 BO 3 (s), and 3.00 mg of NH 4 [BGe 3 O 8 ] (s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 NaOH (aq) which contains 1.98 mg of H 3 BO 3 ) (s) were also measured, respectively. With the use of standard molar enthalpies of formation for NH 4 B 5 O 8 · 4H 2 O (s), K 2 B 4 O 7 · 4H 2 O (s), GeO 2 (s), H 3 BO 3 (s) and H 2 O (l), the standard molar enthalpies of formation of – (3937.1 ± 4.7) kJ · mol −1 for β -K 2 [B 2 Ge 3 O 10 ] and – (2713.7 ± 6.0) kJ · mol −1 for NH 4 [BGe 3 O 8 ] at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles, respectively.
研究领域:
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Changshuai Shen,Wenli Li,Cairong Zhou
The molar heat capacities ( C p ) of guaiacol (CAS 90-50-1) and acetyl guaiacol ester (AGE, CAS 613-70-7) were determinated from 290 K to 350 K by differential scanning calorimetry (DSC), and expressed as a function of temperature. Two kinds of group contribution models were used to estimate the molar heat capacities of both guaiacol and AGE, the average relative deviation is less than 10%. The standard molar enthalpies of combustion of guaiacol and AGE were − 3590.0 kJ·mol − 1 and − 4522.1 kJ·mol − 1 by a precise thermal isolation Oxygen Bomb Calorimeter. The standard molar enthalpies of formation of guaiacol and AGE in a liquid state at 298.15 K were calculated to be − 307.95 kJ·mol − 1 and − 448.72 kJ·mol − 1 , respectively, based on the standard molar enthalpies of combustion. The thermodynamic properties are useful for exploiting the new synthesis method, engineering design and industry production of AGE using guaiacol as a raw material.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Jie Wang,Ai-Qing Zhang,Zhi-Hong Liu
Two pure zinc borates with microporous structure 3ZnO·3B 2 O 3 ·3.5H 2 O and 6ZnO·5B 2 O 3 ·3H 2 O have been synthesized and characterized by XRD, FT-IR, TG techniques and chemical analysis. The molar enthalpies of solution of 3ZnO·3B 2 O 3 ·3.5H 2 O(s) and 6ZnO·5B 2 O 3 ·3H 2 O(s) in 1 mol · dm −3 HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of ZnO(s) in the mixture solvent of 2.00 cm 3 of 1 mol · dm −3 HCl(aq) in which 5.30 mg of H 3 BO 3 were added were also measured. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 1 mol · dm −3 HCl(aq), together with the use of the standard molar enthalpies of formation for ZnO(s), H 3 BO 3 (s), and H 2 O(l), the standard molar enthalpies of formation of −(6115.3 ± 5.0) kJ · mol −1 for 3ZnO·3B 2 O 3 ·3.5H 2 O and −(9606.6 ± 8.5) kJ · mol −1 for 6ZnO·5B 2 O 3 ·3H 2 O at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles .
研究领域:
化学热力学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Sa-Ying Li,Pan Liang
Two alkaline-earth metal borates BaZn 2 B 2 O 6 with NLO property and Ba 2 Cd(B 3 O 6 ) 2 with birefringent property have been synthesized and characterized by XRD, FT-IR, and chemical analysis. The molar enthalpies of solution of BaZn 2 B 2 O 6 (s) and Ba 2 Cd(B 3 O 6 ) 2 (s) in 2.00 mL of 1 mol·dm −3 HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of CdCl 2 ·2.5H 2 O(s) and ZnO(s) in the mixture solvent of 2.00 mL of {1 mol·dm –3 HCl + H 3 BO 3 + Ba(OH) 2 ·8H 2 O} (aq) were also measured, respectively. With the incorporation of the previously determined enthalpies of solution of H 3 BO 3 (s) in 2.00 mL of 1 mol· dm –3 HCl (aq), Ba(OH) 2 ·8H 2 O) in the mixture solvent of (2.00 mL of 1 mol·dm −3 HCl + H 3 BO 3 ) (aq), together with the standard molar enthalpies of formation for CdCl 2 ·2.5H 2 O(s)/ZnO(s), Ba(OH) 2 ·8H 2 O(s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of – (2703.0 ± 2.2) kJ·mol −1 for BaZn 2 B 2 O 6 (s) and – (5625.26 ± 5.1) kJ·mol −1 for Ba 2 Cd(B 3 O 6 ) 2 at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
THERMOCHIMICA ACTA
·
2019
·
IF 2.251
Fei Yuan,Long Li,Yafei Guo,Tianlong Deng
The dilution enthalpies of LiBO 2 (aq) from 0.0398 to 0.7684 mol·kg −1 and LiB 5 O 8 (aq) from 0.0521 to 0.8067 mol·kg −1 at 298.15 K and 101.325 kPa were investigated using the microcalorimeter BT 2.15. The apparent molar enthalpies on two lithium borates were obtained, and the diagrams of their apparent molar enthalpy against molality for LiBO 2 (aq) and LiB 5 O 8 (aq) were also plotted. Considering the constructers of BO 2 - and B 5 O 8 - in aqueous solution are existed as in [B(OH) 4 ]- and [B 5 O 6 (OH) 4 ]-, the Pitzer single-salt parameters ( β M X ( 0 ) L , β M X ( 1 ) L , β M X ( 2 ) L , C M X L ) for LiB(OH) 4 and LiB 5 O 6 (OH) 4 were obtained for the first time. A comparison between the calculated apparent molar enthalpies for LiBO 2 (aq) and LiB 5 O 8 (aq) based on Pitzer model and those determined experimentally agree well, which indicate that the Pitzer single parameters of LiB(OH) 4 and LiB 5 O 6 (OH) 4 obtained are reliable.
研究领域:
物理化学
·
热化学
·
溶液化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2013
·
IF 2.297
Qiu-Yue Kang,Qing Song,Sa-Ying Li,Zhi-Hong Liu
Two pure borophosphates microporous materials, K[ZnBP 2 O 8 ] and NH 4 [ZnBP 2 O 8 ], have been synthesized and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of K[ZnBP 2 O 8 ](s) and NH 4 [ZnBP 2 O 8 ](s) in 3 mol · dm −3 HCl(aq), of KCl/NH 4 Cl(s) in (HCl + H 3 BO 3 )(aq), and of Zn(PO 3 ) 2 (s) in (HCl + H 3 BO 3 + KCl/NH 4 Cl)(aq) were measured by microcalorimeter at T = 298.15 K, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 3 mol · dm −3 HCl(aq), together with the use of the standard molar enthalpies of formation for Zn(PO 3 ) 2 (s), KCl(s), NH 4 Cl(s), H 3 BO 3 (s) and H 2 O(l), the standard molar enthalpies of formation of −(3184.0 ± 1.2) kJ · mol −1 for K[ZnBP 2 O 8 ] and −(3067.6 ± 1.2) kJ · mol −1 for NH 4 [ZnBP 2 O 8 ] at T = 298.15 K was obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
·
物理化学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yang Wang,Huan Wang,Chuanyu Yan,Weitao Wang,Bingzheng Jia,Yiting Yao,Lan Chen,Qilu Hu,Zhimin Xue
To develop a green solvent for lignin dissolution, the most fundamental aspects of its mechanism must be elucidated. Understanding the thermodynamic behaviors is of significant importance for designing novel deep eutectic solvents (DESs) to dissolve lignin. Herein, the heat of dissolution of lignin in acidic, alkaline or neutral DESs was determined by high-precision solution microcalorimetry, and comprehensively investigated the effect of physicochemical properties of DESs on the heat of dissolution and solubility of lignin. The resulted observed that lignin dissolution in alkaline DESs was more vigorous exothermic than that in acidic and neutral DESs. The thermodynamic parameters for the dissolution of lignin in the DESs were calculated from the heat of dissolution and solubility. The positive free energy change indicated that the process of lignin dissolution was non-spontaneous and unfavorable thermodynamically. By analyzing the changes of enthalpy and entropy of lignin solution systematically, lignin dissolution in DESs was enthalpically favorable and controlled by the entropy term. Especially, the interaction entropy predominantly made the free energy change unfavorable for lignin dissolution. The achieved thermodynamic findings could serve as the basis to construct robust DESs for lignin biorefinery.
研究领域:
化学工程
·
生物质科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2021
·
IF 3.178
Qi-Chao Yang,Dong-Fang Qiu,Yuan-Lin Dang,Zhan-Ping Qiao,Zhi-wei Xu
Two equilibrium diagrams of the ternary system (CsX + MnX 2 + H 2 O, X = Cl, Br) at 298.15 K are reported in this paper. Each system has two double salts (CsMnX 3 ·2H 2 O and Cs 2 MnX 4 ·2H 2 O X = Cl, Br) in it and the elements of all double salts in phase diagrams are confirmed by Schreinemaker method. Equilibrium phase diagrams show that the chloride double salts are congruently soluble compounds in water, however that the bromide double salts are incongruently soluble compounds in water. All the double salts are characterized by titrimetric analysis, powder X-ray diffraction, thermogravimetric and differential thermalanalysis. The enthalpies of formation of these double salts are first calculated by measuring their enthalpies of dissolution.
研究领域:
物理化学
·
无机化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 19
·11244-11252
·
IF 3.108
Hongwei Cao,Feixuanyu Qi,Ruowang Liu,Fengtao Wang,Caixia Zhang,Xiaoni Zhang,Yuye Chai,Lanlan Zhai
Hydrogen bonding was used to enhance the crystallinity and thus increase the phase change enthalpy of thermoplastic poly(ethylene glycol)-based polyurethane. With novel hydrogen bonding between two hard segments (NH⋯N) in N-methyldiethanolamine-extended polyurethane (NPU), the intensity of the NH⋯OC hydrogen bond between two hard segments increased, while that of the NH⋯O hydrogen bond between soft and hard segments decreased. The crystallinity and energy storage capability of NPU benefited from these and was thus enhanced. The phase change enthalpy was approximately 140 J g−1, which is very close to the highest value reported for cross-linked polyurethane. In addition, the crystallinity and crystallite perfection of NPU increased with the regular arrangement of soft segments and the microphase separation between soft and hard domains. The influence of the three different hydrogen bonds on the phase change enthalpy, crystallinity, crystallization morphology and microphase structure of the soft segment was discussed.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2014
·
IF 2.423
Pan Liang,Qiu-Yue Kang,Lu Du,Zhi-Hong Liu
Two pure microporous materials, Rb[ZnBP 2 O 8 ] and Cs[ZnBP 2 O 8 ], have been synthesized and characterized by XRD, FT-IR, DTA-TG techniques and chemical analysis. The molar enthalpies of solution of Rb[ZnBP 2 O 8 ] and Cs[ZnBP 2 O 8 ] (s) in 3 mol · dm −3 HCl (aq), of Zn(PO 3 ) 2 (s) in (HCl + H 3 BO 3 ) (aq), and of RbCl (s)/CsCl (s) in [Zn(PO 3 ) 2 + HCl + H 3 BO 3 ] (aq) were measured by microcalorimeter at T = 298.15 K, respectively. With the incorporation of the previously determined enthalpy of solution of H 3 BO 3 (s) in 3 mol · dm −3 HCl (aq), together with the use of the standard molar enthalpies of formation for Zn(PO 3 ) 2 (s), RbCl (s)/CsCl (s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of −(3198.5 ± 1.2) kJ · mol −1 for Rb[ZnBP 2 O 8 ] and −(3212.7 ± 1.2) kJ · mol −1 for Cs[ZnBP 2 O 8 ] at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycle. In addition, the molar enthalpy of formation of −(2944.4 ± 1.2) kJ · mol −1 for [ZnBP 2 O 8 ] − has also been estimated by a group contribution method, which can be used to predict the Δ f H m θ of the other similar borophosphates. Moreover, these data have been further used to compare the thermodynamic stability of this series of borophosphates.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）