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In two-stage leaching process (weak acid leaching and hot acid leaching), dissolution yield of germanium as well as zinc is low due to the compact structure of the residue.
As a branch of chemistry, mechanochemistry is concerned with chemical and physico-chemical transformations of substances in all states of aggregation produced by the effect of mechanical energy.
Creation of fines, increase in specific surface area and creation of defective structures are among the main factors which accelerate leaching in hydrometallurgy[3].
Tkáová also investigated[5] changes in the structure and reactivity of zinc ferrite as a result of mechanical activation.
Journal of Solid State Chemistry, Volume 123, Issue 1, April 1996, Pages 100-108.

We see similar structure between two Al’s.
For kz = -0.5, as shown in the panel (c), the spindle structure between the H-H pair is changed to the pseudo-spindle structure.
When we turned on the electronic current, a spindle structure first formed between one of the H-H pairs and as we increase the electronic current, the spindle structure changed to a pseudo-spindle structure.
Tachibana, in Reviews in Modern Quantum Chemistry, A Celebration in the Contributions of Robert Parr, edited by K.
Tachibana, in Fundamental World of Quantum Chemistry, A Tribute to the Memory o Per-Olov Löwdin, edited by E.

The surface structure of the WSe2 were studied using scanning tunneling microscopy.
The hexagonal crystal structure of WSe2 belongs to the space group D6h4-P63/mmc [12, 13].
The chemistry of two-dimensional layered transition metal dichalcogenide nanosheets, Nat.
Band Structures of Transition-Metal-Dichalcogenide Layer Compounds, Phys.
Single Photon Emitters in Exfoliated WSe2 structures, Nat.

Nanoparticles (NPs), in particular, serve as a bridge between bulk materials and atomic structures due to their extraordinary physical, magnetic, and electrical properties.
Furthermore, these NPs demonstrate a wide range of applications, particularly in the domains of sensing, medicine, chemistry, and nanotechnology [5].
Montanari, Surface plasmon resonance technology: Recent advances, applications and experimental cases, TrAC Trends in Analytical Chemistry, 163 (2023) 117079
Park, Gold nanoparticles for photothermal cancer therapy, Frontiers in Chemistry, 7 (2019) 167
Baffou, Quantifying the efficiency of plasmonic materials for near-field enhancement and photothermal conversion, The Journal of Physical Chemistry C, 119 (2015) 25518-25528

Kuczumow1 1 Department of Chemistry, Catholic University of Lublin, 20-718 Lublin, Poland 2 Institute of Nuclear Physics, Department of Nuclear Spectroscopy, 31-342 Krakow, Poland 3 Institut de Ciencia de Materials de Barcelona (ICMAB), Campus UAB, E-08193-Bellaterra, Spain 4 Department of Chemistry, Materials and Forensic Science, University of Technology, Sydney, PO Box 123, Broadway, N.S.W., 2007, Australia kuczon@kul.lublin.pl, b.ben-nissan@uts.edu.au Abstract.
The skeleton is arranged in a clear ring structure.
Results and Discussion The diffraction results confirmed the dominating role of chitin in the structure of black corals.
Using the electron microprobe, the internal structure as observed on the transversal cross-section was revealed.
The imaging results showed a structure of highly organized biomaterial, with the patterned structure, arranged in the annual rings, composed of the cells.

The XRD diffraction spectra show that all the prepared samples have a ZnO wurtzite structure with a preferential orientation along (002) axis.
The prepared ZnO nanorod structured thin films are highly transparent in the visible region with an average transmittance above 85 % in the 400–800 nm wavelength range.
Experimental The ZnO nanorod structured films were prepared by sol-gel dip-coating technique.
Dharmaprakash, Journal of Physics and Chemistry of Solids 104 (2017) 36-44
Liu, Materials Chemistry and Physics 201 (2017) 18-25

Research revealed all three coatings possessed compact and tight surface structure with excellent thermodynamic stability.
While Ni-W-P coating demonstrated a microcrystalline structure, both Ni-Co-P and Ni-Cu-P were amorphously structured.
This indicated a prevention of the crystal growth by co-deposition of atom Cu, Co and W, rendering an improvement in compactness of the cellular structure and evenness of the surface[4-5].
X-ray diffraction analysis revealed a sharp diffraction peak of Ni-W-P coating approximate around 2θ≈45°, indicating its characteristics of microcrystalline structure.
[16] Hu C，Bai：Materials Chemistry and Physics. 80(2003)，p.215

This helps to develop the structure and potential properties of leather, as well as decrease harmful environmental impact [5-8].
The aim of this research is to identify the influence of polymer-chrome and polymer-titanium tanning on finished leather products structure development and their qualities.
Covington, Tanning chemistry: The science of leather, RSC publishing, 2009
Mokrousova, Stabilizing derma collagen structure with modified dispersions of montmorillonite, IOP Conf.
Zhyhotsky, Structuring of collagen of the dermis during rawhide formation, Chemistry&, Chemical Technology. 11 (2017) 81-91

Synthesis of Hollow Ba0.7Sr0.3TiO3 Nanocubes by Using Molten Hydrated Salt as a Solvent Qi-an Zhu*, a, Gao Baib, Jun-gu Xuc, Jian-xia Wangd and Jin-hui Caie Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry, Xiangtan University, Xiangtan 411105, China azqa7887551@163.com, b635526381@qq.com, c378916688@qq.com, dgradessay2006@sina.com, e625856655@qq.com Keywords: Ba0.7Sr0.3TiO3; ferroelectrics; microstructure; perovskite; hollow nanocube Abstract.
The crystal structure of the samples was investigated by high-resolution transmission electron microscope (HRTEM, JEM-2100).
Through these cracked nanocubes, we can see that they have a hollow interior structure.
The as-synthesized products are cubic phase with polycrystalline structure.
The novel hollow structures of the products may bring out applications in various fields, such as drug delivery, ceramic capacitors and catalyst supporting.

Considering carefully their local lattice environments of the basic groups, we find a new kind, to the best of our knowledge, of H-bond [(OH)3···M] and nominate it as the trimeric H-bond, and further confirm three types of symmetric structures, which have totally four subtypes of trimeric H-bonds so far.
Till now we have determined the crystal structures of most of prepared polycrystalline samples, and found that they belong to four space groups (SGs) [3].
Figs.1 (a~d) show the four kinds of crystal structures with α-Cu2(OH)3Cl, β-Cu2(OH)3Cl, γ-Cu2(OH)3Cl and β-Co2(OH)3Cl as the corresponding representatives, respectively.
Fig. 1 Crystal structures of (a) α-Cu2(OH)3Cl, (b) β-Cu2(OH)3Cl, (c) γ-Cu2(OH)3Cl and (d) β-Co2(OH)3Cl.
Grasping properties of these trimeric H-bonds may give help for understanding the chemistry and physical features of the materials containing them, and we hope all of them can be found in other materials.