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Perera SD, Brotton SJ, Shinsato H, Kaiser RI, Choi Y, Na K. Catalytic Effects of Zeolite Socony Mobil-5 (ZSM-5) on the Oxidation of Acoustically Levitated exo-Tetrahydrodicyclopentadiene (JP-10) Droplets. J Phys Chem A 2021; 125:4896-4909. [PMID: 34041908 DOI: 10.1021/acs.jpca.1c02892] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Jet propulsion 10 (JP-10) droplets with and without aluminum nanoparticles in conjunction with HZSM-5 zeolite and surfactants were ultrasonically levitated, and their oxidation processes were explored to identify how the oxidation process of JP-10 is catalytically affected by the HZSM-5 zeolites and how the surfactant and Al NPs in the system impacted the key experimental parameters of the ignition such as ignition delay time, burn rate, and the maximum temperatures. Singly levitated droplets were ignited using a carbon dioxide laser under an oxygen-argon atmosphere. Pure JP-10 droplets and JP-10 droplets with silicon dioxide of an identical size distribution as the zeolite HZSM-5 did not ignite in strong contrast to HZSM-5-doped droplets. Acidic sites were found to be critical in the ignition of the JP-10. With the addition of the surfactant, the characteristic features of the JP-10 ignition were improved, so the ignition delay time of the zeolite-JP-10 samples were decreased by 2-3 ms and the burn rates were increased by 1.3 to 1.6 × 105 K s-1. The addition of Al NPs increased the maximum temperatures during the combustion of the systems by 300-400 K. Intermediates and end products of the JP-10 oxidation over HZSM-5 were characterized by UV-vis emission and Fourier-transform infrared transmission spectroscopies, revealing key reactive intermediates (OH, CH, C2, O2, and HCO) along with the H2O molecules in highly excited rovibrational states. Overall, this work revealed that acetic sites in HZSM-5 are critical in the catalytic ignition of JP-10 droplets with the addition of the surfactant and Al NPs, enhancing the oxidation process of JP-10 over HZSM-5 zeolites.
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Affiliation(s)
- Sahan D Perera
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
| | - Stephen J Brotton
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
| | - Haylie Shinsato
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
| | - Ralf I Kaiser
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
| | - Yuyeol Choi
- Department of Chemistry, Chonnam National University, Buk-gu, Gwangju 61186, South Korea
| | - Kyungsu Na
- Department of Chemistry, Chonnam National University, Buk-gu, Gwangju 61186, South Korea
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Ho Lee T, Chang Shin M, Jeong BH, Park JH, Kim SH, Lee KB. Prevention of deactivation of HZSM-5 by mixing with NaZSM-5 in catalytic reaction of methylcyclohexane. Catal Today 2020. [DOI: 10.1016/j.cattod.2020.02.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Hasanov EE, Rahimov RA, Abdullayev Y, Asadov ZH, Ahmadova GA, Isayeva AM, Ahmadbayova SF, Zubkov FI, Autschbach J. New class of cocogem surfactants based on hexamethylenediamine, propylene oxide, and long chain carboxylic acids: Theory and application. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.02.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ye D, Zhao L, Bai S, Guo Y, Fang W. New Strategy for High-Performance Integrated Catalysts for Cracking Hydrocarbon Fuels. ACS APPLIED MATERIALS & INTERFACES 2019; 11:40078-40090. [PMID: 31517475 DOI: 10.1021/acsami.9b14285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this study, we described the synthesis, characterization, and application of hyperbranched polymer-encapsulated metal nanoparticles (HEMNs) as integrated catalysts for the supercritical cracking of hydrocarbon fuels. The metal precursor was extracted into the organic phase using a hydrocarbon-soluble hyperbranched poly(amidoamine) (CPAMAM) and then reduced in situ by NaBH4 to produce HEMNs with virtually a single-size distribution. The monitoring of the preparation process by UV-vis demonstrated the feasibility of this encapsulation approach, and the successful synthesis of three different types of HEMNs, metal (Pd, Pt, Au)@CPAMAM, reflected the universality of this method. Compared with the existing catalyst octadecylamine-stabilized Pd nanoparticle, Pd@18N, HEMNs were superior in every aspect. The new encapsulation method allowed metal NPs to have a smaller particle size beneficial to their overall specific surface area and a higher proportion of active surface atoms for a better catalytic activity. Moreover, the space-limiting effect of the polymer allowed the three HEMNs to be highly dispersed in decalin and exhibited admirable stability under storage tests for up to 12 months and high-temperature stability tests at 180 °C. During the supercritical cracking of decalin, Pd@CPAMAM possessed a much better catalytic performance than Pd@18N and CPAMAM (which can also be used as a macroinitiator). To obtain the same heat sink of 3.02 MJ/kg, the temperature could be lowered from 725 to 701, 693, and 699 °C for Pd, Pt, and Au HEMNs, respectively. Pt HEMN turned out to be the best due to its excellent catalytic dehydrogenation/cracking performance, with the conversion of decalin increasing from 22.3 to 50.7% and the heat sink rising from 2.18 to 2.62 MJ/kg with the existence of 50 ppm Pt@CPAMAM, at 675 °C. The significant enhancements were ascribed to the synergistic catalysis through the remarkable abilities of nanometals to catalyze dehydrogenation/cracking of fuel, the supercritical stabilization effects from CPAMAM, and the initiation effects of the hyperbranched polymer CPAMAM.
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Affiliation(s)
- Dengfeng Ye
- Department of Chemistry , Zhejiang University , Hangzhou 310058 , China
| | - Lu Zhao
- Department of Chemistry , Zhejiang University , Hangzhou 310058 , China
| | - Shuaishuai Bai
- Department of Chemistry , Zhejiang University , Hangzhou 310058 , China
| | - Yongsheng Guo
- Department of Chemistry , Zhejiang University , Hangzhou 310058 , China
| | - Wenjun Fang
- Department of Chemistry , Zhejiang University , Hangzhou 310058 , China
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Siddiq AM, Thangam R, Madhan B, Alam MS. Counterion coupled (COCO) gemini surfactant capped Ag/Au alloy and core–shell nanoparticles for cancer therapy. RSC Adv 2019; 9:37830-37845. [PMID: 35541822 PMCID: PMC9075781 DOI: 10.1039/c9ra06494j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Accepted: 10/18/2019] [Indexed: 11/21/2022] Open
Abstract
In this work hybrid silver (Ag)–gold (Au) nanoparticles (NPs) with different sizes and compositions were synthesized and applied for anticancer evaluations and which is effectively involved in cancer cell apoptosis through DNA damage.
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Affiliation(s)
- A. Mohammed Siddiq
- Polymer Science and Technology
- Council of Scientific and Industrial Research (CSIR) – Central Leather Research Institute (CLRI)
- India
| | - Ramar Thangam
- Centre for Academic & Research Excellence (CARE)
- Council of Scientific and Industrial Research (CSIR) – Central Leather Research Institute (CLRI)
- Chennai 600 020
- India
| | - Balaraman Madhan
- Centre for Academic & Research Excellence (CARE)
- Council of Scientific and Industrial Research (CSIR) – Central Leather Research Institute (CLRI)
- Chennai 600 020
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Md. Sayem Alam
- Polymer Science and Technology
- Council of Scientific and Industrial Research (CSIR) – Central Leather Research Institute (CLRI)
- India
- Academy of Scientific and Innovative Research (AcSIR)
- Council of Scientific and Industrial Research (CSIR) – Central Leather Research Institute (CLRI)
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Shen Y, He G, Guo Y, Xie H, Fang W. Modified Hyperbranched Polyglycerol as Dispersant for Size Control and Stabilization of Gold Nanoparticles in Hydrocarbons. NANOSCALE RESEARCH LETTERS 2017; 12:525. [PMID: 28875345 PMCID: PMC5585120 DOI: 10.1186/s11671-017-2296-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 08/29/2017] [Indexed: 06/07/2023]
Abstract
Hyperbranched polyglycerol (HPG) is modified with dodecanethiol (DS) via the "thiol-ene" click reaction to obtain an amphiphilic product DSHPG. The molecular structures of DSHPG samples are characterized by NMR, FTIR, and GPC, and the thermal behaviors are characterized by DSC and TGA. Gold nanoparticles (Au NPs) are prepared with DSHPG as the stabilizer and surface-modification reagent. The size of Au NPs can be tuned by changing the molecular weight of HPG. It is observed that the HPG molecular weights of 1123, 3826, and 55,075 lead to the NP diameters of 4.1 nm for Au@DSHPG-1, 9.7 nm for Au@DSHPG-2, and 15.1 nm for Au@DSHPG-3, respectively. The morphology and size of Au NPs are characterized by TEM and DLS. Especially, the dispersion abilities of Au NPs in different pure solvents and co-solvent mixtures are investigated. The long alkyl chains on DSHPG give the ability of Au NPs to be well dispersed in nonpolar solvents. Hydrocarbon-based nanofluids can be obtained from the hydrophobic Au NPs dispersed into a series of hydrocarbons. The dispersion stability for Au NPs in hydrocarbons is monitored by UV-Vis spectroscopy, and the relative concentration of Au NPs is observed to still maintain over 80% after 3600 h.
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Affiliation(s)
- Yanyu Shen
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China
| | - Guijin He
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China
| | - Yongsheng Guo
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China
| | - Hujun Xie
- Department of Applied Chemistry, Zhejiang Gongshang University, Hangzhou, 310018, China
| | - Wenjun Fang
- Department of Chemistry, Zhejiang University, Hangzhou, 310058, China.
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Review on thermal properties of nanofluids: Recent developments. Adv Colloid Interface Sci 2015; 225:146-76. [PMID: 26391519 DOI: 10.1016/j.cis.2015.08.014] [Citation(s) in RCA: 102] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 08/27/2015] [Accepted: 08/27/2015] [Indexed: 11/23/2022]
Abstract
Nanofluids are dispersions of nanomaterials (e.g. nanoparticles, nanofibers, nanotubes, nanowires, nanorods, nanosheet, or droplets) in base fluids. Nanofluids have been a topic of great interest during the last one decade primarily due to the initial reports of anomalous thermal conductivity (k) enhancement in nanofluids with a small percentage of nanoparticles. This field has been quite controversial, with multiple reports of anomalous enhancement in thermal conductivity and many other reports of the thermal conductivity increase within the classical Maxwell mixing model. Several mechanisms have been proposed for explaining the observed enhancement in thermal conductivity. The role of Brownian motion, interfacial resistance, morphology of suspended nanoparticles and aggregating behavior is investigated both experimentally and theoretically. As the understanding of specific heat capacity of nanofluids is a prerequisite for their effective utilization in heat transfer applications, it is also investigated by many researchers. From the initial focus on thermophysical properties of nanofluids, the attention is now shifted to tailoring of novel nanofluids with large thermal conductivities. Further, to overcome the limitations of traditional heat transfer media, phase change materials (PCMs) and hybrid nanofluids are being developed as effective media for thermal energy storage. This review focuses the recent progress in nanofluids research from a heat transfer perspective. Emphasis is given for the latest work on thermal properties of nanofluids, phase change materials and hybrid nanofluids. The preparation of nanofluids by various techniques, methods of stabilization, stability measurement techniques, thermal conductivity and heat capacity studies, proposed mechanisms of heat transport, theoretical models on thermal conductivity, factors influencing k and the effect of nanoinclusions in PCM are discussed in this review. Sufficient background information is also provided for the beginners.
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Wang YX, Cao YQ, Zhang Q, Meng Q. Novel Cationic Gemini Surfactants Based on Piperazine: Synthesis, Surface Activity, and Foam Ability. J DISPER SCI TECHNOL 2015. [DOI: 10.1080/01932691.2014.986737] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Xu Y, Zhao Y, Chen L, Wang X, Sun J, Wu H, Bao F, Fan J, Zhang Q. Large-scale, low-cost synthesis of monodispersed gold nanorods using a gemini surfactant. NANOSCALE 2015; 7:6790-7. [PMID: 25806617 DOI: 10.1039/c5nr00343a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In this work, we demonstrate that monodispersed gold nanorods (AuNRs) can be obtained in a large-scale and cost-effective way. By using an industrial grade gemini surfactant (P16-8-16), the cost of the synthesis of high-quality AuNRs can be significantly reduced by 90%. The synthesis can be scaled up to over 4 L. The aspect ratio of AuNRs can be well tuned from ∼2.4 to ∼6.3, resulting in a wide tunability of the SPR properties. Systematic studies reveal that P16-8-16 could have a dual function: it can not only act as a capping ligand to stabilize AuNRs but also it can pre-reduce Au(3+) to Au(+) by the unsaturated C[double bond, length as m-dash]C bond. Furthermore, the shape of AuNRs can be tailored from straight nanorods to "dog-bones" by simply varying the concentration of the surfactant. A mechanistic study shows that the shape change can be attributed to the presence of excess bromide ions because of the complex effect between bromide ions and gold ions. This work will not only help to achieve the industrial production of AuNRs, but also promote research into practical applications of various nanomaterials.
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Affiliation(s)
- Yong Xu
- Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano and Soft Materials (FUNSOM) and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, P. R. China.
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E XTF, Zhang Y, Zou JJ, Wang L, Zhang X. Oleylamine-Protected Metal (Pt, Pd) Nanoparticles for Pseudohomogeneous Catalytic Cracking of JP-10 Jet Fuel. Ind Eng Chem Res 2014. [DOI: 10.1021/ie502311x] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Xiu-tian-feng E
- Key
Laboratory for Green Chemical Technology of the Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Yu Zhang
- Key
Laboratory for Green Chemical Technology of the Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Ji-Jun Zou
- Key
Laboratory for Green Chemical Technology of the Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovative Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Li Wang
- Key
Laboratory for Green Chemical Technology of the Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovative Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
| | - Xiangwen Zhang
- Key
Laboratory for Green Chemical Technology of the Ministry of Education,
School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Collaborative Innovative Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China
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