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Among these materials, polymers and their composites have gained significant attention due to their versatility, ease of processing, and tunable properties.
However, these additives are synthetic materials.
To turn waste into materials valuable, this work focuses on exploring the use of amethyst as a novel additive to enhance the properties of PVDF-HFP.
The integration of amethyst into polymer matrices presents an intriguing opportunity to enhance the functional properties of the composite materials.
Liu, Improvement of the piezoelectricity of PVDF-HFP by CoFe2O4 nanoparticles, Nano Materials Science. 6 (2024) 201–210. https://doi.org/https://doi.org/10.1016/j.nanoms.2023.03.002

Several studies focus on aluminum honeycomb to metal honeycomb materials [9-11].
Materials and Methods Fiberglass is widely used as reinforcement for thermosets or thermoplastics.
Nguyen, Sandwich structure based composite materials for construction application, Scientific Journal of Thu Dau Mot University 3(38) (2018) 12-18
Nguyen, Eco-friendly Materials of Polymer Composites Based on Water Hyacinth Fibers/Roving.
Wang, Experimental investigation into the cushioning properties of honeycomb paperboard, Packaging Technology and Science: International Journal 21 (6) (2008) 309-316

In order to explore the impact on resistance from the structural parameters of clean filter materials used in air purification, filter resistance testing stand is built to test the selected materials.
Experimental research on material resistance Sample materials.
Properties of sample polyester materials selected in this paper are shown in table 1.
Journal of Huaqiao University (Natural Science), 31(3) (2010) [7] Xiang X D.
Textile material science.

Therefore, efficient and practical oil-absorbing materials was needed.
However, rubber foaming materials as oil-absorbing materials was a few[4].
Experimental Preparation of EPDM foaming materials a) Compounding and melting of sample.
Zhang: Journal of Applied Polymer Science, Vol. 105 (2007), p. 3462 [4].
Wang, and J.Jin: Journal of Jilin University (Engineering and Technology Edition), Vol. 39 (2009), p. 56

Monolithic porous materials fabricated by dealloying method in Cu-Fe-Co and Cu-Fe-Ni systems Y.
Wang1* Department of Materials Science and Engineering, College of Materials, Xiamen University, Xiamen 361005, China Corresponding author: Cuiping Wang, E-mail: wangcp@xmu.edu.cn Tel: +86-592-2180606; Fax: +86-592-2187966 Keywords: Porous materials, Dealloying, Cu-Fe-Co alloy, Cu-Fe-Ni alloy Abstract: New Cu–Fe-based ternary systems have been developed to fabricate monolithic porous materials through electrochemical dealloying process in a 1.84 mol/L H2SO4 solution.
Pores tend to be distributed irregularly and isotropic in materials made by those methods [6].
To a certain extent, the use of porous films and ribbons was limited since the mechanical property was much poorer than thicker materials such as monolithic materials.
Bian, The Journal of Physical Chemistry C, 113 (2009) 6694-6698

Acknowledgements This work is supported by the National Natural Science Foundation of China (Grant No.60508001).
Matsunaga: International Journal of the Japan Society for Precision Engineering, Vol. 27(10)(1993), pp.1713-1717
Feng: Key Engineering Materials, Vol. 257-258(2004), pp.153-158
Cheng: International Journal of Machine Tools & Manufacture, Vol. 45(9)(2005), pp.1085-1094
Preston: Journal Society of Glass Technology, Vol. 11 (1927), pp. 124-127

Electric spark of alloying – ESA – from the standpoint of materialogy, a new stage in the development of the materials science, is a method of surface hardening that refers to technologies meeting the new development vector of the materials science, including its most important sections – surface materialogy.
The study of the surface in modern materials science becomes increasingly distinct in a separate section of the surface materialogy.
At the same time, unlike materials science, non-traditional raw materials and technologies can be used to obtain new materials in the materialogy of the surface, taking into account the entropy-ecological factor [2, 3].
The ESA method corresponds to the new vector of the materials science development, its most important section – surface materials, which includes subsections on the study and improvement of the properties of the products executive surfaces, which requires further studies. 2.
Egorov, Electrode materials for electrospark doping, M .: Science, 1988, 224 p

The Reference Fig. 3 shows the results of building materials embellishment colors in various atmospheric states.
Generally speaking, the increase of observation distance will make the building materials brightness (an important factor determining architecture identifiability) gradually close to the brightness of atmosphere.
Zhang, “Decay law of Architectural Color in Urban Space,” Journal of Tongji University(Natural Science), vol. 41, pp. 1682-1686,Nov. 2013
[3] Z.Z.Wang, “Reflections on the urban colors planning,” Journal of Tongji University(Natural Science) , vol. 31, pp. 21-26, April.2010
Architecture technology and science, Chongqing Univ., Chongqing, China,2008

A Study on Tactile Friction and Wear -Frictional Wears Characteristics of Human Fingers on Various Soft Materials- Yoshihito ODA, Junji SUGISHITA, Hatsuhiko USAMI, and Tomokazu HATTORI Department of Materials Science Engineering, Meijo University, 1-501 Shiogamaguchi, Tenpaku, Nagoya468-8502, Japan Key words: Friction coefficient, Specific wear rate, finger, stratum corneum, Soft metal, Wood.
The tactile wear is an abrasion phenomenon of solid material by the human skin, and the friction coefficient is several times higher than the usual values obtained among engineering materials[3,11].
We also carried out the similar experiment on several wood materials in which the specific gravity differs.
Therefore, it is understandable to have a small friction coefficient as weak materials such as paulownia and balsawood.
[8] K.Nakajima, Y.Imada, H.Narasaka, N.Mohri and M.Saito: Evaluation of Skin Surface Associated with Morphology and Friction Coefficient, Journal of the Surface Science Society of Japan, (in Japanese), 5 (1984), p.28-34

It is significant for designing new better absorption materials.
Table 1 shows the acoustic parameters of different materials[8].
Table 1 Acoustic parameters of different materials Materials Density （kg/m3） Acoustic velocity Or Young’s modulus loss factor Steel 7840 5941（m/s） Epoxy 1740 2800（m/s） SPUA 1090 109 (pa) 0.50 SBR 1039 1470（m/s） 0.49 3.1 Relation between absorbing materials and model’s performance.
(3) The simulation and experiment of different materials(e.g.
Вреховскхих, in: Wave in Layered medium, Science Publising, Beijing(1985), in press