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Zeitschriftenartikel zum Thema „Ni-initiator“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 12. Februar 2022

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Qiu, Xiaotun, Rui Tang, Ranran Liu, Hai Huang, Shengmin Guo und Hongyu Yu. „A micro initiator realized by reactive Ni/Al nanolaminates“. Journal of Materials Science: Materials in Electronics 23, Nr. 12 (29.04.2012): 2140–44. http://dx.doi.org/10.1007/s10854-012-0726-5.

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Jiang, Ning, Shuang Ling Jin, Xia Shao, Hua Feng Zhang, Zhi Jun Li, Shi Min Zhang, Ming Lin Jin und Rui Zhang. „Synthesis and Characterization of Ni-Doped Carbon Aerogels“. Advanced Materials Research 1061-1062 (Dezember 2014): 133–36. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.133.

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The carbon aerogels doped with nickel were produced by sol-gel, supercritical ethanol drying, and high-temperature carbonization, using resorcinol-furfural as carbon source, nickel nitrate as nickel source, absolute ethanol as dispersion medium, 1,2-epoxypropane as gel initiator, polyacrylic acid as the chelating agent. The carbon aerogels were characterized by nitrogen adsorption and XRD. The effects of the molar ratio of 1,2-epoxypropane to nickel on porosity of the Ni-doped carbon aerogels were investigated. It is found that the Ni-doped carbon aerogels have abundant mesopores and the doped nickel is dispersed in samples in metallic state and oxide or pure metal depending on the preparation conditions. The mesopore volume and average mesopore size all increase with the ratio of 1,2-epoxypropane to nickel.

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Liu, Jie, Xin Min, Xiuzhong Zhu, Zichao Wang, Tong Wang und Xiaodong Fan. „A New Synthesis Strategy on Styrene-Butadiene Di-Block Copolymer Containing High cis-1,4 Unit Via Transfer of Anionic to Coordination Polymerization“. Polymers 11, Nr. 2 (23.01.2019): 195. http://dx.doi.org/10.3390/polym11020195.

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A novel synthesis strategy on styrene-butadiene di-block copolymer (PS-b-PB) with high cis-1,4 unit content was developed, based on a transfer technique from anionic to coordination polymerization. Firstly, the styrene monomer was initiated by n-butyllithium (Li) utilizing anionic polymerization at 50 °C, which resulted in a macromolecular alkylating initiator (PSLi). Secondly, PSLi was aged with nickel naphthenate (Ni) and boron trifluoride etherate (B) for obtaining a complex catalyst system (Ni/PSLi/B). Then, Ni/PSLi/B was applied to initiate the butadiene (Bd) polymerization. Following this new strategy, a series of PS-b-PBs were successfully synthesized. The experimental results indicated that under the molar ratio combination of [Li]/[Ni] = 5 and [B]/[Li] = 1, styrene-butadiene di-block copolymers could be easily achieved with high cis-1,4 unit content (>97%) and controlled molecular weight as well as narrow molecular weight distribution (Mw/Mn < 1.5). Furthermore, the copolymer’s block ratio could also be effectively controlled by controlling the two components’ monomer feed ratio.

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Malawat, M., Jos Istiyanto und D. A. Sumarsono. „Effects of Wall Thickness and Crush Initiators Position under Experimental Drop Test on Square Tubes“. Applied Mechanics and Materials 865 (Juni 2017): 612–18. http://dx.doi.org/10.4028/www.scientific.net/amm.865.612.

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Crush initiators are the weakest points to reduce initial peak load force with significant energy absorption ability. The objective of this paper is to study the effects of square tube thickness and crush initiators position for impact energy absorber (IEA) performance on thin-walled square tubes. Two square tubes having thickness about 0.6 mm (specimen code A) and 1 mm (specimen Code C) were tested under dynamic load. The crushing initiator is designed around the shape of the tube wall and has eight holes with a fixed diameter of 6.5 mm. In the experiment, the crushing initiator was determined at 5 different locations on the specimen wall. These locations are 10 mm, 20 mm. 30 mm, 40 mm, and 50 mm measured from the initial collision position of the specimen tested. The impact load mass was about 80 kg and had a drop height of about 1.5 m. Using the simulation program of the LabVIEW Professional Development System 2011 and National Instrument (NI) 9234 software equipped with data acquisition hardware NI cDAQ-9174 the signal from the load cell was sent to a computer. By controlling the thickness of the thin-walled square tube, the peak loading force can be decreased by approximately 56.75% and energy absorption ability of IEA can be increased approximately to 11.83%. By using different thin-walled square tube can produce different best crush initiators position with the lowest peak load force.

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Bai, Li Bin, Xin Ying Qin, Hai Song Zhang, Hong Chi Zhao und Xin Wu Ba. „Synthesis of Polystyrene-G-Starch Copolymer Initiated by Potassium Diperiodatonickelate(IV)“. Advanced Materials Research 368-373 (Oktober 2011): 280–84. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.280.

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In this article, graft copolymerization of styrene (St) onto cassava starch via potassium diperiodatonickelate (IV)–starch redox system as an initiator was investigated in an alkaline medium. The effects of reaction variables were investigated, and the grafting conditions were optimized. The equation of the polymerization rate were obtained, Rp= k•C1.02 (St)•C0.53 (Ni（IV）). The graft copolymer was characterized with Fourier-transform infrared spectra analysis (FTIR) and scanning electron microscopy (SEM). FTIR spectra indicated the presence of PSt-g-starch copolymer. SEM micrographs also showed PSt adhering on the starch.

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Salah, Ahmed Mahmoud, Mahmoud M. Elaasser, Ibrahim Osman, Alaa Fahmy Mohamed, Hussein H. El-Shiekh und Farag Abd El-Hai. „SYNTHESIS, CHARACTERIZATION AND BIOLOGICAL ACTIVITY OF POLYMER NICKEL (II) COMPLEX“. JOURNAL OF ADVANCES IN CHEMISTRY 12, Nr. 4 (16.12.2016): 4387–96. http://dx.doi.org/10.24297/jac.v12i4.2178.

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4-vinyl pyridine nickel complex containing polymerizable vinyl group, prepared by condensing (4:1 molar ratio) of 4-vinylpyridine with Nickel chloride, then polymerized with methyl methacrylate at 70 °C using AIBN as initiator. Metal complexand polymer metal complex have been characterized by elemental analyses, molar conductance, IR, 1H-NMR , Massspectra and thermal analyses (DTA and TGA). Conductivity measurement reveals the nonelectrolytic nature of thecomplex. This confirms that, the anion is coordinated to the metal ion. The IR reveal the metal ion is coordinated via thenitrogen atom of 4-VP. Nickel complex and polymer nickel complex have been tested invitro against number of tumor andnumber of microorganisms in order to assess their anti tumor and antimicrobial properties. The antimicrobial activity wasobserved by compounds VP-Ni and MMA-VP-Ni under the screening conditions. The activity against HCT-116 cells wasdetected for compound VP-Ni (with IC50 value 9.8±0.6 µg/ml), compared with reference standard (24.6±0.3 µg/ml) followedby MMA-VP-Ni (48.3±1.5). In conclusion, this study highlighted the synthesis of polymer nickel complex, and proved thepromising biological activity of the synthesized compounds.

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Liu, Jie, Xin Min, Xuan Zhang, Xiuzhong Zhu, Zichao Wang, Tong Wang und Xiaodong Fan. „A novel synthetic strategy for styrene–butadiene–styrene tri-block copolymer with high cis -1,4 units via changing catalytic active centres“. Royal Society Open Science 6, Nr. 6 (Juni 2019): 190536. http://dx.doi.org/10.1098/rsos.190536.

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A styrene–butadiene–styrene tri-block copolymer (SBS) with a high cis -1,4 unit content (greater than 97%) was synthesized by a novel synthetic strategy based on changing the catalytic active centres using n -butyllithium and a nickel-based catalyst. Firstly, styrene was polymerized via anionic polymerization using butyllithium as the initiator (Li, activity centre Li) at 50°C. The obtained alkylated macroinitiator (PSLi) was aged with nickel naphthenate (Ni) and boron trifluoride etherate (B) to prepare a second reactive centre (Ni-F), which was used to initiate the polymerization of butadiene (Bd). Finally, triphenyl phosphine (PPh 3 ) was added to adjust the electron density of the third active centre (P-Ni-F), and styrene monomer was added again to synthesize the second polystyrene block to obtain SBS. The polymerization technique presented here is simple and has an efficient initiation effect due to the high initiation activities for the different monomers. It also exhibits excellent control over the stereo-structure of the butadiene segments in the prepared copolymers, and the SBS polymers with high cis -1,4 unit content were easily achieved.

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Min, Xin, Changchao Zhan, Ping Yan und Zhigang Ye. „New strategy for synthesis of hydroxyl-terminated poly(3-hexylthiophene) and its block copolymer using an η3-π-allyl hydroxyl-functionalized Ni(i) initiator“. RSC Advances 10, Nr. 65 (2020): 39814–21. http://dx.doi.org/10.1039/d0ra07773a.

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A novel hydroxyl-terminated π-allyl nickel initiator is synthesized for the first time. Hydroxyl-terminated PB-b-P3HT block copolymer and hydroxyl-terminated P3HT are synthesized by using the initiator to improve the workability of P3HT.

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Liu, Zhan Jun, Ming Fei Zhao, Zhen Gang Wu und Gang Han. „Preparation and Properties of Chitosan Graft Copolymer Nanoparticles Using Potassium Diperiоdatоnickelate“. Advanced Materials Research 924 (April 2014): 61–64. http://dx.doi.org/10.4028/www.scientific.net/amr.924.61.

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Nanoparticles comprising chitosan-graft-poly (methyl methacrylate) (CS-g-PMMA) copolymer were successfully synthesized in aqueous solution by using potassium diperiоdatоnickelate (Ni (IV)) as an initiator. The nanoparticles were characterized in terms of Fourier transform infrared (FTIR), dynamic light scattering (DLS) and transmission electron microscopy (TEM). The results indicated that chitosan was covalently linked to poly (methyl methacrylate) (PMMA) and the particles were uniform, spherical and well dispersed with narrow size distribution. Paclitaxel-loaded nanoparticles were prepared and in vitro release showed that these nanoparticles provided an initial burst release followed by a slowly sustained release for more than 16 days. Therefore, this process method would be used for synthesizing natural polymer graft copolymer nanoparticles with wide prospect.

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Min, Xin, und Xiaodong Fan. „η3 -π-Allyl Acetoxyl Ni Complex, an Efficient Initiator for Synthesis of Hydroxyl-Terminated Polybutadiene with High cis -1,4 Unit Content“. Macromolecular Chemistry and Physics 219, Nr. 24 (23.11.2018): 1800479. http://dx.doi.org/10.1002/macp.201800479.

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Açıkses, Aslışah, Necmittin Çömez und Fatih Biryan. „Preparation and Characterization of Styrene Bearing Diethanolamine Side Group, Styrene Copolymer Systems, and Their Metal Complexes“. International Journal of Polymer Science 2018 (2018): 1–15. http://dx.doi.org/10.1155/2018/6703783.

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The two copolymer systems of styrene bearing diethanol amine side group and styrene were prepared by free radical polymerization method at 60°C in presence of 1,4-dioxane as solvent and AIBN as initiator. Their metal complexes were prepared by reaction of the copolymer used as ligand P(DEAMSt-co-St)L′′ and Ni(II) and Co(II) metal ions, which was carried out in presence of ethanol and NaOH at 65°C for 48 h in pH = 7.5. The structures of the copolymers used as ligand and metal complexes were identified by FT-IR, 1H-NMR spectra, and elemental analysis. The properties of the copolymers used as ligand and metal complexes were characterized by SEM-EDX, AAS, DSC, TGA, and DTA techniques. Then, the electrical properties of the copolymers and metal complexes were examined as a function of the temperature and frequency, and the activation energies (Ea) were estimated with conductivity measurements.

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., Yunasfi, P. Purwanto und Mashadi . „PEMANFAATAN TEKNIK HEM UNTUK PENUMBUHAN CNT DARI GRAFIT MENGGUNAKAN Ni SEBAGAI KATALIS = UTILIZATION OF HEM TECHNIQUE FOR GROWTH OF CNT FROM GRAPHITE POWDERS BY USING Ni AS CATALYST“. Majalah Ilmiah Pengkajian Industri 10, Nr. 1 (13.09.2016): 35–40. http://dx.doi.org/10.29122/mipi.v10i1.101.

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Utilization of HEM (high energy milling) technique for growth of CNT (carbon nanotube) from graphite powders by using Ni as catalyst was carried out. Milling process performed on a mixture of graphite powder and nickel powder (Ni-C powders) with the ratio of weight percent of 98%: 2%, with a variation of milling time between 25 up to 75 hours. Characterization using PSA (Powder Size Analyzer), SAA (Surface Area Analyzer), TEM (Transmission Electron Microscope) and Raman Spectroscopy performed to obtain information about particle size, surface area, morphology and the structure bonding of the milled powder respectively. The analysis results of Ni-C powders using PSA and SAA showed the smallest particle size and biggest surface area obtained after milling process for 50 hours, i.e. 80 nm and 705 m2/g, respectively. TEM observations revealed formation of flat fibers which quantity increased with increasing milling time. This flattened fiber behave as an initiator for the growth of CNTs. Ni-C powder milling for 50 hours results more clearly show the growth of CNTs. Analysis by Raman Spectroscopy showed two bands at 1582 cmâˆ’1 as a peak of G band and at 1350 cm-1 as a peak of D band. These spectra are typical for sp2 structure. The position of G band peak is close to 1600 cm-1 as the evidence of a change to nano-crystalline graphite. The highest intensity of D band shown in the milling process for 50 hours, which indicates that this milling time produces more graphite-like structure compared to other conditions, and is predicted good for growing CNTs.Â AbstrakPemanfaatan teknik HEM (High Energy Milling) untuk penumbuhan CNT (carbon nanotube) dari serbuk grafit dengan menggunakan Ni sebagai katalis. Proses milling dilakukan terhadap campuran serbuk grafit dan serbuk nikel (serbuk Ni-C) dengan perbandingan berat 98% : 2%, dengan variasi waktu milling antara 25-75 jam. Karakterisasi menggunakan fasilitas PSA (Particle Size Analyzer), SAA (Surface Area Analyzer), dan TEM (Transmission Electron Microscope) serta Raman Spektroscopy yang masing-masingnya untuk mendapatkan informasi tentang ukuran partikel, luas permukaan dan morfologi serta struktur ikatan serbuk hasil milling. Hasil analisis serbuk Ni-C dengan PSA dan SAA menunjukkan ukuran partikel paling kecil dan luas permukaan paling besar diperoleh setelah proses milling selama 50 jam, masing-masing 80 nm dan 705 m2/g. Pengamatan TEM menunjukkan serbuk-serbuk berbentuk serat pipih dengan kuantitas yang meningkat dengan bertambahnya waktu milling. Serat pipih ini perupakan cikal bakal penumbuhan CNT. Serbuk Ni-C hasil milling menunjukkan penumbuhan CNT terlihat lebih jelas setelah milling selama 50 jam. Hasil analisis dengan Raman Spectroscopy memperlihatkan puncak G band pada bilangan gelombang 1582 cmâˆ’1 yang merupakan spektrum untuk struktur sp2 dari grafit dan puncak D band pada bilangan gelombang 1350 cm-1 yang mungkin merupakan deformasi struktur grafit. Posisi puncak G band mendekati 1600 cm-1 menjadi bukti perubahan ke grafit nano kristal. Intensitas D band tertinggi ditunjukkan oleh sistem komposit Ni-C hasil proses milling selama 50 jam dan hal ini sebagai indikasi bahwa proses milling selama 50 jam terhadap sistem komposit Ni-C lebih berstruktur mirip grafit (graphitic-like material) dibanding kondisi lainnya dan diprediksi bagus untuk menumbuhkan CNT. Dengan demikian, waktu milling yang optimal untuk penumbuhan CNT dari serbuk grafit dengan menggunakan Ni sebagai katalis adalah adalah 50 jam.Â Â

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Corbo-Rodgers, Evann, Elizabeth S. Staub, Tao Zou, Abigail Smith, Taku Kambayashi und Jonathan S. Maltzman. „Oral ivermectin as an unexpected initiator of CreT2-mediated deletion in T cells“. Nature Immunology 13, Nr. 3 (16.02.2012): 197–98. http://dx.doi.org/10.1038/ni.2232.

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Harake, Nicole R., und William L. Dunlop. „Storying the heartbreak“. Narrative Inquiry 30, Nr. 1 (10.03.2020): 18–40. http://dx.doi.org/10.1075/ni.18064.har.

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Abstract We examined narratives of romantic breakups (i.e., breakup accounts) in relation to romantic attachment tendencies. In Study 1, participants provided accounts of difficult breakups and indicated who in the relationship initiated its dissolution. In Study 2, participants provided breakup accounts from the perspective of the initiator and the non-initiator. Breakup accounts were coded for levels of exploration (active reflection of the narrated experience) and resolution (emotional closure and a sense of resiliency). Across studies, levels of resolution were highest in self-initiated, when compared to other-initiated, breakup accounts. In Study 2, avoidant attachment correlated negatively with levels of resolution in self-initiated, but not other-initiated, breakup accounts. These results suggest that avoidantly attached individuals narrate self-initiated breakups in a less thoroughly processed manner than their secure peers, and that these differences in transformational processing may carry implications for romantic domain functioning.

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Petraki, Eleni. „The Play of Identities in Cypriot-Australian Family Storytelling“. Narrative Inquiry 11, Nr. 2 (31.12.2001): 335–62. http://dx.doi.org/10.1075/ni.11.2.05pet.

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This article adopts a microanalytic approach to examine storytelling as a co-construction by family members in a Cypriot-Australian family. Previous studies on family storytelling have focused on the various roles of family members in storytelling with a means of studying family socialization (Miller et al., 1990; Ochs & Taylor, 1992; Blum-Kulka, 1997). These studies used critical discourse analysis, sociocultural theories, performance and pragmatic approaches to storytelling. This article offers a distinctive approach to family storytelling by examining the discourse and social identities that family members display during the storytelling. The data originate in a study that involves interviews with three generations of Greek-Australian and Cypriot-Australian women regarding their relationships with each other. In this paper we investigate the contributions of the father and the daughters in the course of the mother’s turn at storytelling. The first part of the analysis focuses on the husband’s discourse identities as a contributor, initiator and elicitor of his wife’s storytelling. During the storytelling we also observe the production and exchange of different social identities between the husband and the mother, such as the ‘unwilling suitor’, the ‘embarrassed schoolgirl’ or the ‘forceful but teasing husband’. The second part describes how the daughters take part in their mother’s storytelling, producing a variety of identities such as the ‘impatient mother’, the ‘complaining’, ‘happy’, or ‘good’ mothers and daughters. These investigations succinctly illustrate how narratives become a resource for members’ ‘display’ and ‘play’ of identities.

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Zhang, Yuxin, Hongchuan Jiang, Xiaohui Zhao, Yichao Yan, Wanli Zhang und Yanrong Li. „Characteristics of the Energetic Micro-initiator Through Integrating Al/Ni Nano-multilayers with Cu Film Bridge“. Nanoscale Research Letters 12, Nr. 1 (13.01.2017). http://dx.doi.org/10.1186/s11671-016-1812-z.

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