INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Xiaohan Wang,Yasong Zhou,Zhiqing Yu,Qiang Wei,Haoran Liu,Jinxiao Sun,Wenbin Huang,Jinquan Tao,Meng Huang
A novel SAPO-11 molecular sieve with a lamellar structure and flower-like morphology was synthesized using cationic surfactant cetyltrimethylammonium bromide (CTAB) as the surfactant and KF as the mineralizer. Meanwhile, the effect of various CTAB additions on the structure and properties of SAPO-11 molecular sieves was also investigated. A number of characterization analyses’ findings reveal that, compared with conventional spherical SAPO-11 molecular sieves, flower-like SAPO-11 molecular sieves have the following advantages: (1) Flower-like SAPO-11 molecular sieves have open pores and larger mesopores, with suitable distribution of mesopores. (2) The prepared flower-like SAPO-11 molecular sieves have a lower total acid value but have a higher proportion of Brønsted acid sites, with suitable acidity. (3) The flower-like NiW/SAPO-11 catalysts have better dispersion of WS2 slabs and higher balance and proximity between metal sites and acid sites. The synthesized flower-like NiW/SAPO-11 showed significant isomerization performance and low cracking selectivity during the isomerization of n-hexadecane. When the conversion rate of n-hexadecane reached 77.0%, the yield of i-hexadecane was 59.4%.
研究领域:
化学工程
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材料科学
·
催化
·
石油化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Li Te,Xie Lianwu,Long Ruiqing,Tong Chaoying,Guo Ying,Tong Xia,Shi Shuyun,Lin Qinlu
Red-emissive carbon dots (CDs) were synthesized by one-step hydrothermal technique using citric acid (CA), and urea in N , N -dimethylformamide (DMF) solution. The CDs has an average diameter of 2.3 nm, excitation/emission maxima at 553/606 nm, and a low photoluminescence quantum yield (4%). Fluorescence is weakly quenched by the ions Fe 3+ , Hg 2+ , Cu 2+ , Co 2+ , Zn 2+ , Ca 2+ , Ni 2+ , and Pb 2+ . After addition of cetyltrimethyl ammonium ion (CTAB), electrostatic interaction between negatively charged CDs and CTAB causes the CDs to self-aggregate. The formation of CD/CTAB increases the average particle diameter to around 13 nm and enhances the quantum yield to 24%. The hydrophobic segments of CTAB twined into a network structure can selectively trap Fe 3+ and then interact with surface groups of the CDs to cause quenching. The CD/CTAB nanoprobe enables fluorometric determination of Fe 3+ with a linear response in the 0.10–10 μM concentration range and a 0.03 μM limit of detection. The probe was utilized for determination of Fe 3+ in human serum samples, and satisfactory results were obtained.
Schematic representation of fluorometric analysis of Fe(III) ion by cetyltrimethyl ammonium ion (CTAB) mediated red emission carbon dots (CDs). The hydrophobic segments of CTAB twined into a network structure can selectively trap Fe(III) and then interact with surface groups of the CDs to cause quenching.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2014
·
IF 4.835
Li Ping Wang,Qi Feng Li,Chao Wang,Xiao Zheng Lan
Solid–liquid phase behaviors of the hexadecane–octadecane (n-C16H34–C18H38, C16–C18) system in the bulk, and confined in controlled porous glass (CPG) are investigated using differential scanning calorimetry and temperature-dependent powder X-ray diffraction. Bulk C16–C18 mixtures show the special rotator phase RI, and two intermediate phases with monoclinic (Mdcp) and orthorhombic (Op) structures. Inside CPG (8.1 and 300 nm), the RI and Op phases could be found in wider compositions of the solid mixtures than the bulk, however the Mdcp form was not observed. Unexpectedly, under the confinement of CPG (8.1 nm) not only the rotator RI appeared in the two pure components, C16 and C18, but a rotator phase RII occurred in the pure C18 and most of the mixtures upon heating. These new phase behaviors of the confined alkanes could be attributed to the size effect and the interface interactions. According to XRD analysis, in the small pores of CPG (8.1 nm) the alkane molecules effectively take the 2D arrangements. While in the large pores of CPG (300 nm), they take ordered packing to some extent both in the lamellar and lateral directions.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 18
·10737-10747
·
IF 3.108
Jian Sui,Shi Qi Zhang,Min Zhai,Fang Tian,Jian Zhang,Xiao Zheng Lan
Inspired by the interest in the confinement effect on polymorphism of alkane mixtures, phase behaviors of a hexadecane–heptadecane (n-C16H34–C17H36, C16–C17) binary system in the bulk and in nanopores of controlled porous glasses (CPGs) are investigated using differential scanning calorimetry (DSC) and temperature-dependent powder X-ray diffraction (XRD). As reported, bulk C16–C17 mixtures form two intermediate phases with monoclinic (Mdci) and orthorhombic (Op) structures in a low temperature range and rotator phase RI in high temperature range. In the pores of CPG (300 nm), these solid phases appear in the temperatures slightly below the bulk system. The RI one-phase region extends a bit in temperature range in the mixtures of high C17 components. In CPG (8.1 nm), the solid phases come up in much lower temperatures than the bulk. The rotator RI is found in a larger range of the temperature and composition than the bulk and in CPG (300 nm). A new phase, the rotator RII, is observed in a narrow temperature range of high C17 composition just before melting. XRD analysis shows diffractions from the alkane layered ordering in CPG (300 nm) with a more roughened layer surface than the bulk. Lamellar stacking of the solids in CPG (8.1 nm) is heavily perturbed. The variation in the polymorphism of C16–C17 mixtures in the nanopores is associated with the reduced ordering of the molecule arrangements. These results can help to understand the influence of confinement effect on binary mixtures of alkanes, the chain molecules.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2013
·Vol. 116
·期 1
·469-476
·
IF 1.982
Wang L. P.,Wang T. B.,Gao C. F.,Lan X.,Lan X. Z.
Phase behaviors of dodecane–hexadecane ( n -C 12 H 26 –C 16 H 34 , C 12 –C 16 ) binary mixtures in bulk and confined in SBA-15 (pore diameters 3.8, 9.5, and 17.2 nm) are investigated using differential scanning calorimetry. According to the thermal analysis, the bulk mixtures belong to a system of partial miscibility with two solid solutions and a eutectoid in the range of mole fraction \( x_{{{\text{C}}_{ 1 6} }} \) = 0.1–0.8. Under confinement, phase behavior of C 12 –C 16 mixtures is distinct from the bulk. Inside pores of SBA-15 (3.8 nm), the solid mixtures has only a melting boundary. In the pores larger than 9.5 nm, phase behaviors of the mixtures show some resemblance to the bulk system. The growth of the phase diagram with the pore diameter clearly shows the size effect on the phase behavior of the confined mixtures. In comparison with those of chain length difference of pure components of two carbon atoms or less, C 12 –C 16 mixtures exhibit different phase behaviors not only in the bulk but also in the confined state.
研究领域:
物理化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Xiaohan Wang,Zhiqing Yu,Jinxiao Sun,Qiang Wei,Haoran Liu,Wenbin Huang,Luyuan Zhao,Meng Si,Yasong Zhou
A series of in situ dodecyl trimethyl ammonium bromide (DTAB)-modified small-crystal Y zeolites have been successfully synthesized by DTAB addition to the seed synthesis procedure, which was used to create the small crystal size Y zeolites. Compared to the Y zeolites prepared without DTAB, the Y zeolites prepared with DTAB have a uniform morphology and mesoporous structure, a larger specific surface area (up to 32.3 m2 g–1 increase), a smaller crystal size (up to 66 nm reduction), and more Brönsted acid sites (up to 55 μmol/g increase). After loading with NiW, the corresponding NiW catalysts were utilized in the hydrocracking of n-hexadecane. It is evident from the catalytic performance that the catalysts containing DTAB-modified small-crystal zeolites have a higher yield and selectivity of primary cracking products compared with the Y zeolites without DTAB modification. Moreover, the conversion of n-hexadecane is also higher due to its low mass-transfer resistance, high dispersion, and sulfation of W species. When the molar ratio of DTAB/Al2O3 is 0.15, the corresponding catalyst has the optimum balance between cracking and hydro–dehydrogenation activity. Therefore, it has the most excellent catalytic performance and a 7.3% increase in C8–C12 yield.
研究领域:
催化材料
·
石油化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 4
·49734
·
IF 2.52
Qirui Yi,Jingyu Li,Runhua Zhang,Erni Ma,Ru Liu
Small particle diameter thermally expandable microspheres (TEMs) were obtained for potential utilization in wood, with special attention on their particle diameters and expansion properties. The revolving speed of homogenization (RS) of 800 ~ 3000 r min −1 was applied in suspension polymerization under atmospheric pressure to prepare TEMs, with n -hexane as core material and the copolymer of acrylonitrile, methyl acrylate, and vinyl acetate as shell. (a) The effect of the RS on the particle diameters of TEMs presented a negative correlation at low RS and remained stable at high RS, (b) When the RS was 1900 ~ 2100 r min −1 , the optimized TEMs with average particle diameters of 3.82 ~ 4.06 μm were prepared, possessing expansion ratios of 3.4 ~ 4.3 and an expansion temperature of 112°C, (c)The optimized TEMs had core-shell structure and high encapsulated content of alkane, and (d) The TEMs with small particle diameters could be impregnated into wood and expand successfully in wood cell lumens.
研究领域:
材料科学
·
林业工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 36
·1801421
·
IF 13.325
Peng Meng,Yulong Wu,Quan Zhang,Guoan Cheng,Xiaoling Wu,Ruiting Zheng
The dielectric pulse effect is of interest for many applications such as sensors, smart triggers, and energy storage. In this paper, a general approach to achieve a room temperature dielectric pulse effect via solid–liquid phase transition in organic mixtures formed by conductive surfactants and insulating fluid is introduced. The dielectric pulse is caused by the self-formed blocking layer appearing during the solid–liquid phase transition by mixing Span80 and hexadecane. Using 50 Vol% Span80/hexadecane mixture, the dielectric peak intensity of 1191.6 is achieved at 11.9 °C. The dielectric peak intensity and the trigger temperature of mixtures can be tuned by changing the proportions of the components, the temperature ramping rate, and the components. The generality of the approach is also demonstrated in other organic matter such as Span series, alcohols, alkanes and their mixtures.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2019
·
IF 2.584
Wenjie Ji,Weibin Li,Yuren Wang,Ding Lan
Droplets of n-hexadecane were observed to shrink under ultraviolet (365 nm) and spread under blue light (475 nm) irradiation on an aqueous solution of photosensitive surfactant AzoTAB. We demonstrate that the change of wettability of n-hexadecane droplet on the solution depends on the change of oil–water interface tension. According to the addition of ethanol into the substrate, the change of relative diameter ΔD/D exceeds 20%, much larger than the system without ethanol. With light-emitting diode (LED) light as a sole power source, without any other triggers, we provide a contactless and isothermal method to realize photocontrolled alternative spreading and shrinking of a droplet on a liquid surface, which provides a basis for a chromocapillary-based optical zoom liquid lens.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Xuefei Li,Dong Feng,Muyuan Chai,Shengchao Xu,Ammar Mohammedomar,Wenbo Zhao
Removal of sulfur dioxide (SO2) from flue gas by developing a highly efficient phase-change absorption solution is an effective way to tackle increasingly serious air pollution problems. In this study, the phase-change absorption behaviors of SO2 by using low cost 2-(diethylamino)ethanol (DEEA)/hexadecane as absorbent/solvent was systematically studied. The homogeneous solution could be facilely and quickly changed into two immiscible liquid phases upon introducing low partial pressure SO2. The liquid–liquid phase-change phenomenon was attributed to the formation of zwitterionic product by the reaction of DEEA with SO2, which was insoluble in low polarity hexadecane. Specifically, the absorption capacity of DEEA toward SO2 under 20 °C could reach 0.51 and 1.56 g of SO2/g of DEEA at 0.02 and 1 atm, respectively, which exhibited front-rank absorption capacity to most reported works. In addition, it was suggested that the present absorbent exhibited a highly selective absorption property and high removal efficiency of SO2. The well-matched absorbent/solvent phase-change system holds a promising application in the treatment of industrial flue gases.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yongwei Cai,Qi Zhao,Xuejun Quan,Wei Feng,Qingkuo Wang
Superhydrophobic and superoleophilic meshes have attracted great attention in oil/water separating application. However, superhydrophobic surfaces are not only complicated in preparation but also easy to break in practical applications. In this paper, we prepared fluorine-free hydrophobic hexadecyltrimethoxysilane (HDTMS)-TiO 2 coated meshes with properties of cost-effectiveness, easy to manufacture, and high separation efficiency by a liquid phase deposition method. The surface topography , composition , and functional groups of the meshes were characterized by field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and Fourier transform microscopic infrared spectrometer (FT-IR) spectrum, respectively. A new gravity-driven oil/water separator was designed for the separation experiments. The separation efficiency of the hydrophobic HDTMS-TiO 2 coated meshes maintained over 97.8% after 35 separating cycles. This study indicated that the superhydrophobicity of the separating mesh was nonessential for the highly efficient oil-water separation. The fluorine-free hydrophobic HDTMS-TiO 2 coated meshes provided an economical and beneficial solution to treat industrial oily wastewater mixtures and environmental oil spills.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2018
·Vol. 9
·期 1
·15
·
IF 1.835
Bin Luo,Junbo Liu,Quanjun Liu,Chao Song,Li Yu,Shimei Li,Hao Lai
Zinc is mostly extracted from oxidized zinc and zinc sulfide minerals, and this process involves flotation as a key step. While it is easier to float the sulfide mineral, its consumption and depletion has led to an increased reliance on oxidized zinc minerals, including smithsonite. Hence, the development of efficient ways of collecting smithsonite by flotation is an important objective. Herein, we describe the use of 2-(hexadecanoylamino)acetic acid (HAA), a novel surfactant, as a collector during smithsonite flotation. The mechanism and flotation performance of HAA during smithsonite flotation was investigated by total organic carbon (TOC) content studies, zeta potential measurements, Fourier-transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS) analyses, combined with microflotation experiments. The flotation results revealed that HAA was an excellent collector in pulp over a wide pH range (9–12) and at a relatively low concentration (2 × 10−4mol/L), at which a recovery of close to 90% of the smithsonite mineral was obtained. TOC content studies revealed that the good flotation recovery was ascribable to large amounts of collector molecule adsorbed on the smithsonite surface, while zeta potential measurements showed that the HAA was chemically adsorbed onto the smithsonite. FTIR and XPS analyses revealed that the HAA collector molecules adsorbed onto the smithsonite surface as zinc–HAA complexes involving carboxylate moieties and Zn sites on the smithsonite surface in alkaline solution.Keywords:smithsonite;flotation;2-(hexadecanoylamino)acetic acid;collector;adsorption
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）