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SAXS

SAXS的相关文献在1990年到2023年内共计123篇,主要集中在化学、化学工业、一般工业技术 等领域,其中期刊论文87篇、会议论文2篇、专利文献34篇;相关期刊48种,包括化工学报、炭素、新型炭材料等; 相关会议2种,包括中国科协第2届优秀博士生学术年会、第18届炭-石墨材料学术会等;SAXS的相关文献由288位作者贡献,包括李志宏、徐坚、朱才镇等。

SAXS—发文量

期刊论文>

论文:87 占比:70.73%

会议论文>

论文:2 占比:1.63%

专利文献>

论文:34 占比:27.64%

总计:123篇

SAXS—发文趋势图

SAXS

-研究学者

  • 李志宏
  • 徐坚
  • 朱才镇
  • 海洋
  • 赵宁
  • 莫志深
  • Soheil Sharifi
  • 吴忠华
  • 刘会超
  • 期刊论文
  • 会议论文
  • 专利文献

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    • Kou-Qi Liu; Zhi-Jun Jin; Lian-Bo Zeng; Meng-Di Sun; Bo Liu; Ho Won Jang; Majid Safaei-Farouji; Mohammadreza Shokouhimer; Mehdi Ostadhassan
    • 摘要: Characterizing the kerogen-hosted pore structures is essential to understand the adsorption,transport and storage potential in organic-rich shale reservoirs.In this paper,we first separated the organic matter(kerogen)from the mineral matrix in four different shale samples of the Bakken Formation with different thermal maturities and then analyzed their chemical compositions using the wide-angle X-ray scattering(WAXS)method.Next,we acquired small-angle X-ray scattering(SAXS)to characterize the structure of the organic matter and see how these two will relate.The WAXS results showed that the isolated kerogens have high purity(free of inorganic minerals)and retain different chemical compositions.Moreover,SAXS analysis revealed that the isolated kerogens have similar radius of gyration(R_(g))which is around 90Åand the molecules are in the compact mode.Based on the pore size distribution analysis from the SAXS data,two main peaks were found in all of these four samples with one peak less than 40Åand the other one larger than 1000Å.Also,the TEM images revealed that Sample 1 is abundant in pores with sizes around 20 nm while Sample 2 does not have pores of that size,which agrees with the results from the pore size distribution that was obtained from the SAXS method.Ultimately,this study exhibits how different analytical instruments can provide us with useful information from complex structures of geomaterials.
    • 杜倩倩; 谷景华; 默广; 魏彦茹; 殷文杰; 李甲
    • 摘要: 由金属醇盐(M(OR)4)水解制备溶胶的方法已广泛应用于溶胶-凝胶法制备纳米孔无机膜.通过控制异丙醇钛[Ti(i-OC3H7)4]和正丙醇锆[Zr(n-OC3H7)4]的混合物在异丙醇(i-C3H7OH)中水解制备聚合型TiO2-ZrO2溶胶,利用小角X射线散射方法(SAXS)研究了初始反应混合物Ti(i-OC3H7)4∶Zr(n-OC3H7)4∶H2O∶i-C3H7OH =0.9∶0.1∶m∶30(摩尔比,m=1.8,2.0,2.2)形成TiO2-ZrO2溶胶的过程,探讨了水与醇盐摩尔比H2O/M(OR)4 (M=Ti+Zr)、反应温度和正丙醇锆对TiO2-ZrO2溶胶形成的影响.研究结果表明,H2O/M(OR)4=1.8时,只有少量胶粒形成;H2O/M(OR)4=2.0~2.2时,TiO2-ZrO2溶胶中胶粒具有质量分形结构,分形维数1.2≤Dm< 1.4;随着H2O/M(OR)4增加,胶粒的形成时间缩短,胶粒大小和分形维数均增大,溶胶的稳定性显著下降.升高反应温度有利于胶粒形成.[Ti(i-OC3H7)4+Zr(n-OC3H7)4]混合物比Ti(i-OC3H7)4水解快,H2O/M(OR)4相同时,TiO2-ZrO2溶胶比TiO2溶胶稳定性差.
    • Ge Jin; Kenichi Okamura; Yoshifumi Suzuki; Yong Sun; Yoshinori Chikaura; Masami Ando
    • 摘要: We performed a feasibility study of Small angle X-ray scattering imaging under the condition of X-ray bright field imaging by Laue crystal diffraction optics of X-ray dark-field imaging that works as an angular analysis. Collagen in chicken tibia containing abundant soft fibrous tissue was chosen as a specimen. In traditional Small angle X-ray scattering optical system, we can derive the structure information of sample by calculating q value which is available from a scattering pattern. Thus it is usually necessary to conduct a 2D scan in order to obtain scattering image. In this paper it is described by a method by which not only small angle X-ray scattering imaging is available directly but also bright-field imaging and dark-field imaging can be obtained at the same time. As the first step, the feasibility of the imaging method should be confirmed by taking pictures of the samples with known periodic length. The preliminary test showed that the collgan’s lattice spacing d is 65.1 nm that was also taken photos by scanning electron microscopy. By rotating Laue angular analyzer by 112 arcseconds small angle X-ray scattering image appeared in bright-field.
    • 杜倩倩; 谷景华; 默广; 魏彦茹; 殷文杰; 李甲
    • 摘要: 由金属醇盐水解制备溶胶的方法已广泛应用于溶胶-凝胶法制备纳米孔无机膜,但对金属醇盐水解机理的认识十分有限.通过控制异丙醇钛[Ti(i-OC3H7)4]在异丙醇(i-C3H7OH)中水解制备TiO2溶胶,利用小角X射线散射(SAXS)方法研究了由不同H2O/Ti(i-OC3H7)4的反应混合物[Ti(i-OC3H7)4:H2O:i-C3H7OH=1:m:30(摩尔比)]形成TiO2溶胶的过程,探讨了控制Ti(i-OC3H7)4水解的过程中胶粒形成与长大的规律.研究结果表明,所合成的TiO2溶胶的胶粒粒径小于10 nm,胶粒的形成和长大与H2O/Ti(i-OC3H7)4摩尔比密切相关.H2O/Ti(i-OC3H7)4(摩尔比)≥2.0时,随着H2O/Ti(i-OC3H7)4增加,溶胶的稳定性下降.%Metal oxide sols can be prepared from metal alkoxides by hydrolyzation, which has been widely used in synthesis of nano-porous ceramic membranes by sol-gel method. However, the knowledge on hydrolysis mechanism of metal alkoxides is very limited. In this paper, TiO2 sols were prepared by controlled hydrolyzation of titanium isopropoxide [Ti(i-OC3H7)4] in isopropanol (i-C3H7OH). The formation of TiO2 sols from the initial reactant mixtures with different molar ratios of H2O/Ti(i-OC3H7)4 [Ti(i-OC3H7)4:H2O:i-C3H7OH = 1:m:30] was charterized by small angle X-ray scattering (SAXS). The mechanism of formation and growth of colloidal particles is discussed. TiO2 sol with a particle size less than 10 nm can be obtained. The formation and growth of colloidal particles are remarkably influenced by the molar ratio of H2O/Ti(i-OC3H7)4. When the molar ratio of H2O/Ti(i-OC3H7)4≥ 2.0, the stability of TiO2 sol decreases with the molar ratio of H2O/Ti(i-OC3H7)4increasing.
    • 巩雁军; 刘汝庚; 赵晓萌; 张恒
    • 摘要: As a physical technique, small angle X-ray scatter (SAXS) can be used to study the geometric structure of inhomogeneous electron density zone inside the matter at nanometer level. This review focuses on advantages and features of synchrotron radiation X-ray source SAXS, and the newly progress of its application to characterizations of sol-gel process, synthesis process and structure of zeolite, in particular, the existence behavior of silicoaluminum species in sol-gel system, the influence on synthesis of zeolite and the fractal structure, particle size, mesoporous size, morphology and interface features of zeolite. Finally, the problems existing in SAXS application to zeolite-related researches are discussed and the future research direction is proposed.%小角 X 射线散射(SAXS)是在纳米尺度范围内研究物质内部电子密度不均匀区几何结构的物理手段。着重介绍了同步辐射光源小角X射线散射技术(SAXS)优势和特点,系统地总结了SAXS技术在溶胶-凝胶过程、分子筛合成过程及分子筛表征方面的最新进展,尤其是SAXS技术研究溶胶体系中硅物种的存在行为及其对分子筛合成的影响规律,以及在研究分子筛的分形结构、粒径尺寸和介孔的分子筛孔道的大小、形貌和分子筛界面特征方面的最新进展。最后分析了SAXS在分子筛研究中存在问题并对其在该领域未来的研究方向进行了展望。
    • 赵雷; 汪星星; 胡卓炎; 李冰; 刘国琴; 李琳
    • 摘要: 冷冻面制品在食品行业发展迅速,但在冻藏过程中对面制品品质影响的关键性问题仍未明朗.本研究采用小角X射线散射仪(SAXS)探讨了恒温冻藏(-18°C)对小麦面筋蛋白分子链构形、均方根旋转半径(Rs)及分子量的影响.实验发现,冻藏前,面筋蛋白分子在500 mM乙酸溶液中链结构较疏松,属于质量分形(分形维数Dm: 2.05),呈现网络状的结构.随着冻藏时间的延长,Lm值呈现下降的趋势,表明面筋蛋白高聚物的链结构逐渐疏松,同时发现在冻藏过程中面筋蛋白平均分子量和Rs都随着冻藏时间的增加也呈现下降趋势,并且Rs与Dm的变化正相关,说明在冻藏过程中由于冰晶的重结晶等作用使得高聚物发生了解聚现象,造成了面筋蛋白分子链的断裂,从而使得其网络结构的疏松.
    • 蔡斌; 王婷
    • 摘要: 在以P25二氧化钛为钛源,水热反应时间为1,2,3,4天条件下,合成钛酸纳米管(TNTs)形成过程中的4种产物,采用XRD,SAXS和N2吸附/脱附等温线等手段进行表征。以Cd(Ⅱ)为代表污染物,研究4种产物对Cd(Ⅱ)的吸附,并着重分析4种产物的结构对其吸附能力的影响。粉末XRD结果表明,TNTs的4种产物均为单斜晶胞结构。SAXS和N2吸附/脱附表征证实,水热法制备TNTs经历二氧化钛源结构解体→钛酸纳米管形成→管状结构解体的过程,TNTs-3d具有最为规整的管状形貌。吸附等温线结果表明,LangmuirFreundlich模型能够更好地拟合吸附等温结果,且Cd(Ⅱ)的吸附量大小顺序为TNTs-3d≈TNTs-1d>TNTs-4d>TNTs-2d。进一步的分析表明,样品的回转半径、孔体积对吸附量影响较小,而比表面积和平均孔径可能会显著影响吸附容量。
    • 摘要: 液晶由于具有长程有序性,因此被广泛用来制备高度有序的材料。氧化石墨烯在溶液中也可以形成液晶,它已经被成功地用来制备高强度的石墨烯纤维以及薄膜。对于普通尺寸的氧化石墨烯来说,形成高取向的向列相液晶需要很高的浓度(〉10 mg·mL-1)。但这种高浓度却不适合用来制备低密度的石墨烯气凝胶。
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