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You searched for: Publication year rev 7981-2019 Remove constraint Publication year rev: 7981-2019 Subject term Raman spectroscopy Remove constraint Subject term: Raman spectroscopy Subject term crystal structure Remove constraint Subject term: crystal structure
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1. A novel non-enzymatic H2O2 sensor using ZnMn2O4 microspheres modified glassy carbon electrode

Author:
Yuanyuan Li; Li Tang; Dongmei Deng; Jinhong Ye; Zhenyu Wu; Jinhua Wang; Liqiang Luo
Source:
Colloids and surfaces 2019 v.179 pp. 293-298
ISSN:
0927-7765
Subject:
Raman spectroscopy; X-ray diffraction; colloids; crystal structure; energy-dispersive X-ray analysis; glassy carbon electrode; hydrogen peroxide; microparticles; milk; scanning electron microscopy; sensors (equipment)
Abstract:
... With a facile solvothermal technique, ZnMn2O4 microspheres were synthesized in this work, which were used as enzyme mimics for the electrocatalytic reduction of H2O2. The morphology, crystal phase and structure of the ZnMn2O4 microspheres underwent characterization under X-ray diffraction spectroscopy, Raman spectroscopy, energy-dispersive spectroscopy, and scanning electron microscopy. The synthe ...
DOI:
10.1016/j.colsurfb.2019.04.008

2. Aluminum Redistribution in ZSM-5 Zeolite upon Interaction with Gaseous Halogens and Hydrogen Halides and Implications in Catalysis

Author:
Vladimir Paunović; Sharon Mitchell; René Verel; Sung Sik Lee; Javier Pérez-Ramírez
Source:
Journal of physical chemistry 2019 v.124 no.1 pp. 722-733
ISSN:
1932-7455
Subject:
Fourier transform infrared spectroscopy; Raman spectroscopy; X-ray diffraction; aluminum; bromine; catalysts; catalytic activity; chemical bonding; chlorine; crystal structure; electron microscopy; halides; hydrobromic acid; hydrochloric acid; methane; natural gas; nitrogen; nuclear magnetic resonance spectroscopy; oxidation; silicon; sorption; temperature; zeolites
Abstract:
... The impact of halogens (Cl₂ and Br₂) and hydrogen halides (HCl and HBr) on the structural stability of zeolite catalysts constitutes an important yet poorly understood aspect of their performance in methane halogenation and halomethane coupling, which are pivotal steps in the halogen-mediated upgrading of natural gas. By studying the interaction of the ZSM-5 zeolite (Si/Al = 43) as a representativ ...
DOI:
10.1021/acs.jpcc.9b09984

3. Antiferroelectric Phase Transition in a Proton-Transfer Salt of Squaric Acid and 2,3-Dimethylpyrazine

Author:
Jeff Lengyel; Xiaoping Wang; Eun Sang Choi; Tiglet Besara; Rico Schönemann; Sanath Kumar Ramakrishna; Jade Holleman; Avery L. Blockmon; Kendall D. Hughey; Tianhan Liu; Jacob Hudis; Drake Beery; Luis Balicas; Stephen A. McGill; Kenneth Hanson; Janice L. Musfeldt; Theo Siegrist; Naresh S. Dalal; Michael Shatruk
Source:
Journal of the American Chemical Society 2019 v.141 no.41 pp. 16279-16287
ISSN:
1520-5126
Subject:
Raman spectroscopy; X-radiation; X-ray diffraction; anions; cations; color; crystal structure; crystallization; engineering; heat; hydrogen bonding; moieties; neutron diffraction; protons; pyrazines
Abstract:
... A proton-transfer reaction between squaric acid (H₂sq) and 2,3-dimethylpyrazine (2,3-Me₂pyz) results in crystallization of a new organic antiferroelectric (AFE), (2,3-Me₂pyzH⁺)(Hsq–)·H₂O (1), which possesses a layered structure. The structure of each layer can be described as partitioned into strips lined with methyl groups of the Me₂pyzH⁺ cations and strips featuring extensive hydrogen bonding be ...
DOI:
10.1021/jacs.9b04473

4. Biopolymeric films obtained from the parenchyma cells of Agave salmiana leaves

Author:
Julio Silva-Mendoza; María Elena Cantú-Cárdenas; Sofia Vazquez-Rodriguez; Alberto Toxqui-Terán; Leonardo Chávez-Guerrero
Source:
Cellulose 2019 v.26 no.3 pp. 1869-1879
ISSN:
0969-0239
Subject:
Agave salmiana; Fourier transform infrared spectroscopy; Raman spectroscopy; X-ray diffraction; cellulose; crystal structure; hydrolysis; leaves; optical properties; scanning electron microscopy; solubilization
Abstract:
... Here, we report a non-aggressive method to obtain nanocellulose (NC) from the parenchyma of Agave salmiana leaves. This is accomplished by using a low concentration of a “piranha solution” to achieve solubilization and remove non-cellulosic components, isolating the NC in a single hydrolysis step. X-ray diffraction analysis has shown an increase in the crystallinity index of cellulose from 35 to 6 ...
DOI:
10.1007/s10570-018-2173-9

5. Detection and Crystal Structure of Hydrogenated Bipentacene as an Intermediate in Thermally Induced Pentacene Oligomerization

Author:
Craig I. Hiley; George F. S. Whitehead; Marco Zanella; Charlene Delacotte; Troy D. Manning; Matthew J. Rosseinsky
Source:
Journal of organic chemistry 2019 v.84 no.13 pp. 8481-8486
ISSN:
1520-6904
Subject:
Raman spectroscopy; chemical bonding; crystal structure; crystals; electron microscopy; electronics; heat; oligomerization; organic chemistry; organic compounds
Abstract:
... 6,6′,13,13′-Tetrahydro-6,6′-bipentacene (HBP), the intermediate molecule connecting pentacene to previously observed peripentacene and extended pentacene oligomers through the formation of a carbon–carbon bond, is synthesized and crystallographically characterized. Heating pentacene to 300 °C under vacuum for 200 h results in pale golden crystals of HBP and amorphous material containing pentacene ...
DOI:
10.1021/acs.joc.9b00671
PubMed:
31244161
PubMed Central:
PMC7007227

6. Effect of liquid sourdough technology on the pre-biotic, texture, and sensory properties of a crispy flatbread

Author:
Manuela Sanna; Simonetta Fois; Giovanni Falchi; Marco Campus; Tonina Roggio; Pasquale Catzeddu
Source:
Food science and biotechnology 2019 v.28 no.3 pp. 721-730
ISSN:
1226-7708
Subject:
Raman spectroscopy; crystal structure; flat breads; in vitro digestion; liquids; sensory properties; sourdough; starch; texture; yeasts
Abstract:
... The present study compared liquid sourdough technology with baker’s yeast leavening when applied to the production of a semolina-based crispy flatbread. Following in vitro starch digestion, the results revealed the sourdough leavened flatbread to contain a lower percentage of rapidly digestible starch (16%), higher amounts of slowly digestible starch (27%) and inaccessible digestible starch (4.1%) ...
DOI:
10.1007/s10068-018-0530-y
PubMed:
31093429
PubMed Central:
PMC6484046

7. Effects of ball milling on the structure of cotton cellulose

Author:
Zhe Ling; Tuo Wang; Mohamadamin Makarem; Michael Santiago Cintrón; H. N. Cheng; Xue Kang; Markus Bacher; Antje Potthast; Thomas Rosenau; Holly King; Christopher D. Delhom; Sunghyun Nam; J. Vincent Edwards; Seong H. Kim; Feng Xu; Alfred D. French
Source:
Cellulose 2019 v.26 no.1 pp. 305-328
ISSN:
0969-0239
Subject:
Fourier transform infrared spectroscopy; Raman spectroscopy; X-radiation; X-ray diffraction; cellulose; cellulosic materials; crystal structure; crystallites; electron microscopy; gel chromatography; light microscopy; lint cotton; milling; models; moieties; molecular weight; nuclear magnetic resonance spectroscopy; particle size; tensile strength; thermogravimetry; water content
Abstract:
... Cellulose is often described as a mixture of crystalline and amorphous material. A large part of the general understanding of the chemical, biochemical and physical properties of cellulosic materials is thought to depend on the consequences of the ratio of these components. For example, amorphous materials are said to be more reactive and have less tensile strength but comprehensive understanding ...
DOI:
10.1007/s10570-018-02230-x

8. Electrophoretically Deposited MoSe₂/WSe₂ Heterojunction from Ultrasonically Exfoliated Nanocrystals for Enhanced Electrochemical Photoresponse

Author:
Alkesh B. Patel; Hiren K. Machhi; Payal Chauhan; Som Narayan; Vijay Dixit; Saurabh S. Soni; Prafulla K. Jha; Gunvant K. Solanki; Kireetkumar D. Patel; Vivek M. Pathak
Source:
ACS applied materials & interfaces 2019 v.11 no.4 pp. 4093-4102
ISSN:
1944-8252
Subject:
Raman spectroscopy; X-ray diffraction; X-ray photoelectron spectroscopy; absorption; atomic force microscopy; crystal structure; electrochemistry; electrodes; electrophoresis; irradiation; liquids; nanocrystals; scanning electron microscopy; transmission electron microscopy
Abstract:
... The solar response ability and low-cost fabrication of the photoanode are important factors for the effective output of the photoelectrochemical system. Modification of the photoanode by which its ability to absorb irradiation can be manipulated has gained tremendous attention. Here, we demonstrated the MoSe₂, WSe₂, and MoSe₂/WSe₂ nanocrystal thin films prepared by the liquid-phase exfoliated and ...
DOI:
10.1021/acsami.8b18177

9. Extracellular Electron Transfer Between Birnessite and Electrochemically Active Bacteria Community from Red Soil in Hainan, China

Author:
Manyi Sun; Guiping Ren; Yan Li; Anhuai Lu; Hongrui Ding
Source:
Geomicrobiology journal 2019 v.36 no.2 pp. 169-178
ISSN:
1521-0529
Subject:
Raman spectroscopy; bacterial communities; birnessite; cathodes; crystal structure; electric potential difference; electrochemistry; electron transfer; microbial fuel cells; microorganisms; oxygen; ribosomal RNA; scanning electron microscopy; soil; China
Abstract:
... The interplay between electrochemically active microorganisms (EAMs) and adjacent minerals universally occurs in natural environments, in which soil is an extremely typical and active one. We stimulated the extracellular electron transfer (EET) process between the bacterial community and birnessite in red soil (collected from Hainan, China) by constructing a microbial fuel cell equipped with synth ...
DOI:
10.1080/01490451.2018.1526986

10. Fabrication of TiO₂(B)/Anatase Heterophase Junctions at High Temperature via Stabilizing the Surface of TiO₂(B) for Enhanced Photocatalytic Activity

Author:
Zihao Wang; Yilan Wang; Wan Zhang; Zenglin Wang; Yi Ma; Xin Zhou
Source:
Journal of physical chemistry 2019 v.123 no.3 pp. 1779-1789
ISSN:
1932-7455
Subject:
Raman spectroscopy; X-ray diffraction; anions; crystal structure; energy; hydrogen production; lithium batteries; phase transition; photocatalysis; pollution; semiconductors; temperature; titanium dioxide
Abstract:
... In recent years, TiO₂(B) has been widely used in photocatalysis, electrocatalysis, and lithium-ion batteries due to its unique crystal structure. However, as a metastable phase semiconductor, TiO₂(B) is prone to transform into the stable anatase or rutile phase at high temperature. Therefore, the low crystallinity of TiO₂(B) was usually formed at low temperature. Both of the above two concerns res ...
DOI:
10.1021/acs.jpcc.8b09763

11. Facile functionalization of cellulose from discarded cigarette butts for the removal of diclofenac from water

Author:
Emmanuel Abu-Danso; Afrouz Bagheri; Amit Bhatnagar
Source:
Carbohydrate polymers 2019 v.219 pp. 46-55
ISSN:
0144-8617
Subject:
Fourier transform infrared spectroscopy; Raman spectroscopy; adsorption; agitation; alkali treatment; carbon; cellulose; cellulose nanofibers; cigarettes; crystal structure; diclofenac; energy-dispersive X-ray analysis; ions; moieties; nanocrystals; phenol; phosphates; phosphoric acid; scanning electron microscopy; sorption isotherms; sulfuric acid; temperature
Abstract:
... In this study, cellulose nanocrystals (CNCs), and cellulose nanofibers (CNFs) were extracted from discarded cigarette butts (DCBs), and investigated for their efficiency for diclofenac (Dfc) removal from water. CNFs extraction process involved cleaving of acetyl group by alkali treatment and etched with phosphate ions (HPO) from phosphoric acid to obtain the variably charged HPO-CNFs. To obtain CN ...
DOI:
10.1016/j.carbpol.2019.04.090

12. Facile stabilization of a cyclodextrin metal–organic framework under humid environment via hydrogen sulfide treatment

Author:
Duo Ke; Jun-Feng Feng; Di Wu; Jun-Bo Hou; Xiao-Qin Zhang; Bang-Jing Li; Sheng Zhang
Source:
RSC advances 2019 v.9 no.32 pp. 18271-18276
ISSN:
2046-2069
Subject:
Raman spectroscopy; X-ray photoelectron spectroscopy; adsorption; coordination compounds; crystal structure; cyclodextrins; formaldehyde; hydrogen sulfide; porosity; potassium; relative humidity; thermogravimetry
Abstract:
... Increasing resistance to humid environments is a major challenge for the application of γ-CD-K-MOF (a green MOF) in real-world utilisation. γ-CD-K-MOF–H₂S with enhanced moisture tolerance was obtained by simply treating MOF with H₂S gas. XPS, Raman and TGA characterizations indicated that the H₂S molecules coordinated with the metal centers in the framework. H₂S acting as a newly available water a ...
DOI:
10.1039/c9ra03079d

13. Facile synthesis of hierarchical chrysanthemum-like copper cobaltate-copper oxide composites for enhanced microwave absorption performance

Author:
Di Lan; Ming Qin; Ruisheng Yang; Shuang Chen; Hongjing Wu; Yuancheng Fan; Quanhong Fu; Fuli Zhang
Source:
Journal of colloid and interface science 2019 v.533 pp. 481-491
ISSN:
0021-9797
Subject:
Raman spectroscopy; X-ray diffraction; absorption; angle of incidence; crystal structure; cupric oxide; cuprous oxide; electromagnetic radiation; hot water treatment; temperature; thermogravimetry; transmission electron microscopes; transmission electron microscopy
Abstract:
... Hierarchical chrysanthemum-like CuCo₂O₄-CuO composites were successfully synthesized by a facile one-pot hydrothermal method after calcination at 500 °C. Based on the results of X-ray diffraction (XRD), Raman spectra, thermogravimetric analysis (TGA) and transmission electron microscope (TEM), we found that not only the morphology (from 2 dimensional to 3 dimensional) but also the crystalline stru ...
DOI:
10.1016/j.jcis.2018.08.108

14. Growth of Layered Copper–Alkanethiolate Frameworks from Thin Anodic Copper Oxide Films

Author:
N. Arisnabarreta; P. Paredes-Olivera; F. P. Cometto; E. M. Patrito
Source:
Journal of physical chemistry 2019 v.123 no.28 pp. 17283-17295
ISSN:
1932-7455
Subject:
Raman spectroscopy; X-ray photoelectron spectroscopy; air; copper; crystal structure; cupric oxide; density functional theory; disulfides; electrochemistry; ethanol; hexane; mathematical theory; oxidation; oxygen production; sodium hydroxide; solvents; thiols
Abstract:
... We investigated the conversion of electrochemically grown CuO into copper–alkanethiolate lamellar structures supported on a Cu substrate upon immersion in solutions of n-alkanethiols. After considering different preparation conditions (alkyl chain length, thiol concentration, and type of solvent), we found that the oxide can be rapidly converted into compact and highly passivating lamellar layers ...
DOI:
10.1021/acs.jpcc.9b03264

15. High dose self-ion irradiation of silicon carbide with nanostructured ferritic alloy aid

Author:
Kaijie Ning; Kathy Lu; Robert J. Bodnar
Source:
Journal of materials science 2019 v.54 no.1 pp. 605-612
ISSN:
0022-2461
Subject:
Raman spectroscopy; alloys; behavioral resistance; cladding; crystal structure; ions; irradiation; models; oxidation; radiation resistance; scanning electron microscopy; silicon carbide; thermal properties
Abstract:
... Silicon carbide (SiC) and its composites are gaining interests because of their high physical and chemical stability, good oxidation and irradiation resistance, and excellent mechanical and thermal behaviors for nuclear cladding applications. In this work, ion irradiation on spark plasma-sintered SiC with and without nanostructured ferritic alloy aid (0 vol% NFA–100 vol% SiC and 2.5 vol% NFA–97.5  ...
DOI:
10.1007/s10853-018-2824-0

16. Infrared and Raman spectra of Bi₂O₂X and Bi₂OX₂ (X = S, Se, and Te) studied from first principles calculations

Author:
Yao-Di Xu; Cong Wang; Yang-Yang Lv; Y. B. Chen; Shu-Hua Yao; Jian Zhou
Source:
RSC advances 2019 v.9 no.31 pp. 18042-18049
ISSN:
2046-2069
Subject:
Raman spectroscopy; bismuth; crystal structure; density functional theory; physical properties; selenium; sulfur; tellurium
Abstract:
... The bismuth oxychalcogenide compounds contain many different kinds of materials, such as Bi₂O₂X and Bi₂OX₂ (X = S, Se, and Te). These materials have different but similar layered crystal structures and exhibit various interesting physical properties. Here, we have theoretically investigated their Raman and infrared spectra by first principles calculations based on density functional theory. It is ...
DOI:
10.1039/c9ra02584g

17. Insight into the origin of carbon corrosion in positive electrodes of supercapacitors

Author:
Rui Tang; Kaishi Taguchi; Hirotomo Nishihara; Takafumi Ishii; Emilia Morallón; Diego Cazorla-Amorós; Toshihiro Asada; Naoya Kobayashi; Yasuji Muramatsu; Takashi Kyotani
Source:
Journal of materials chemistry A 2019 v.7 no.13 pp. 7480-7488
ISSN:
2050-7496
Subject:
Raman spectroscopy; X-ray diffraction; activated carbon; adsorption; corrosion; crystal structure; desorption; electric potential difference; electrodes; electrolytes; energy density; magnetism; moieties; nitrogen; phenol; porosity; temperature
Abstract:
... While activated carbons are used as electrode materials in commercial supercapacitors, they are not stable under high voltage operation especially at a positive-electrode side, and this limits the working voltage of supercapacitors to about 2.8 V in organic electrolytes. Thus, revealing the specific carbon chemical structures causing the corrosion is of great significance to come up with ideas of ...
DOI:
10.1039/c8ta11005k

18. Letrozole induced changes in bone mineral properties and mechanical functions of laying hens

Author:
Qiao Li; Jifei Xia; Shujie Wang; Zhenlei Zhou; Zhen Li
Source:
Poultry science 2019 v.98 no.6 pp. 2562-2569
ISSN:
0032-5791
Subject:
Raman spectroscopy; acid phosphatase; biochemical mechanisms; carbonates; crystal structure; estrogens; femur; humerus; laying hens; mechanical properties; physicochemical properties
Abstract:
... Bone volumes and quality are related to their hormone levels in laying hens. In this study, we investigated letrozole (LZ) induced effects on the physicochemical properties of cortical bone in laying hens. After 9-wk LZ treatment, we observed that LZ could decrease estrogen level in laying hens. As a result, both the plasma tartrate-resistant acid phosphatase and bone Gla protein activities were s ...
DOI:
10.3382/ps/pey605

19. Modulation, Characterization, and Engineering of Advanced Materials for Electrochemical Energy Storage Applications: MoO₃/V₂O₅ Bilayer Model System

Author:
Ran Attias; Michael Salama; Reeta Pant; Yossef Gofer; Doron Aurbach
Source:
Journal of physical chemistry 2019 v.123 no.27 pp. 16577-16587
ISSN:
1932-7455
Subject:
Raman spectroscopy; X-ray diffraction; actuators; atomic force microscopy; crystal structure; electrochemistry; energy; ions; lithium; models; photonics; scanning electron microscopy; texture
Abstract:
... Core–shell, multilayered and coated materials have great importance to electrochemical energy storage systems, sensors, actuators, photonics, and photoactive applications. A deeper understanding of the effect of combining different materials in complex structures on their physical and electrochemical properties is vital for better engineering of such compounds and wise modulation of their physical ...
DOI:
10.1021/acs.jpcc.9b04371

20. Probing cellulose structures with vibrational spectroscopy

Author:
Mohamadamin Makarem; Christopher M. Lee; Kabindra Kafle; Shixin Huang; Inseok Chae; Hui Yang; James D. Kubicki; Seong H. Kim
Source:
Cellulose 2019 v.26 no.1 pp. 35-79
ISSN:
0969-0239
Subject:
Raman spectroscopy; biomass; cell walls; cellulose; crystal structure; density functional theory; image analysis; lignocellulose
Abstract:
... This paper reviews principles, data interpretations, and applications of vibrational spectroscopic methods used for analysis of cellulose in the isolated state and in plant cell walls or lignocellulose biomass. The paper begins with reviewing the crystalline structures of crystalline cellulose polymorphs and the principles of three different vibrational spectroscopy methods—infrared (IR), Raman, a ...
DOI:
10.1007/s10570-018-2199-z